{"id":70911,"date":"2026-02-02T19:40:52","date_gmt":"2026-02-02T11:40:52","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/70911.html"},"modified":"2026-02-02T19:40:52","modified_gmt":"2026-02-02T11:40:52","slug":"linux6-19-arm64-mm-mmap%e5%ad%90%e6%a8%a1%e5%9d%97%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/70911.html","title":{"rendered":"Linux6.19-ARM64 mm mmap\u5b50\u6a21\u5757\u6df1\u5165\u5206\u6790"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>1. \u6982\u8ff0<\/li>\n<li>2. \u8f6f\u4ef6\u67b6\u6784\u56fe<\/li>\n<li>3. \u8c03\u7528\u6d41\u7a0b\u56fe<\/li>\n<li>4. UML\u7c7b\u56fe<\/li>\n<li>5. \u6e90\u7801\u6df1\u5ea6\u5206\u6790<\/li>\n<li>\n<ul>\n<li>5.1 ARM64\u5185\u5b58\u6620\u5c04\u67b6\u6784\u5206\u6790<\/li>\n<li>\n<ul>\n<li>5.1.1 mmap\u7cfb\u7edf\u8c03\u7528\u5b9e\u73b0<\/li>\n<li>5.1.2 \u5730\u5740\u7a7a\u95f4\u5206\u914d<\/li>\n<\/ul>\n<\/li>\n<li>5.2 \u5185\u5b58\u6620\u5c04\u5efa\u7acb\u5206\u6790<\/li>\n<li>\n<ul>\n<li>5.2.1 VMA\u521b\u5efa\u548c\u7ba1\u7406<\/li>\n<li>5.2.2 \u6587\u4ef6\u6620\u5c04\u5904\u7406<\/li>\n<\/ul>\n<\/li>\n<li>5.3 \u6620\u5c04\u7c7b\u578b\u548c\u6743\u9650\u7ba1\u7406\u5206\u6790<\/li>\n<li>\n<ul>\n<li>5.3.1 \u6620\u5c04\u7c7b\u578b\u5904\u7406<\/li>\n<li>5.3.2 \u5b89\u5168\u548c\u6743\u9650\u9a8c\u8bc1<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>6. \u8bbe\u8ba1\u6a21\u5f0f\u5206\u6790<\/li>\n<li>\n<ul>\n<li>6.1 \u7b56\u7565\u6a21\u5f0f\u5728\u6620\u5c04\u7c7b\u578b\u9009\u62e9\u4e2d\u7684\u4f53\u73b0<\/li>\n<li>6.2 \u5de5\u5382\u6a21\u5f0f\u5728VMA\u521b\u5efa\u4e2d\u7684\u4f53\u73b0<\/li>\n<li>6.3 \u89c2\u5bdf\u8005\u6a21\u5f0f\u5728\u6620\u5c04\u76d1\u63a7\u4e2d\u7684\u4f53\u73b0<\/li>\n<\/ul>\n<\/li>\n<li>7. \u72b6\u6001\u673a\u5206\u6790<\/li>\n<li>8. \u6027\u80fd\u4f18\u5316\u5206\u6790<\/li>\n<li>\n<ul>\n<li>8.1 \u5730\u5740\u5206\u914d\u4f18\u5316<\/li>\n<li>8.2 \u6620\u5c04\u9884\u70ed\u4f18\u5316<\/li>\n<\/ul>\n<\/li>\n<li>9. \u5b89\u5168\u6027\u8003\u8651<\/li>\n<li>\n<ul>\n<li>9.1 \u6620\u5c04\u6743\u9650\u5b89\u5168\u9a8c\u8bc1<\/li>\n<li>9.2 \u5730\u5740\u7a7a\u95f4\u9694\u79bb\u4fdd\u62a4<\/li>\n<\/ul>\n<\/li>\n<li>10. \u6269\u5c55\u6027\u5206\u6790<\/li>\n<li>\n<ul>\n<li>10.1 \u591a\u67b6\u6784\u652f\u6301<\/li>\n<li>10.2 \u529f\u80fd\u6269\u5c55<\/li>\n<\/ul>\n<\/li>\n<li>11. \u8c03\u8bd5\u548c\u7ef4\u62a4<\/li>\n<li>\n<ul>\n<li>11.1 mmap\u8c03\u8bd5\u652f\u6301<\/li>\n<li>11.2 \u9519\u8bef\u68c0\u6d4b\u548c\u6062\u590d<\/li>\n<\/ul>\n<\/li>\n<li>12. \u603b\u7ed3<\/li>\n<\/ul>\n<hr \/>\n<p>\u2003\u2003\u56e2\u961f\u535a\u5ba2: \u6c7d\u8f66\u7535\u5b50\u793e\u533a<\/p>\n<hr \/>\n<h2>1. \u6982\u8ff0<\/h2>\n<p>\u2003\u2003ARM64 mm mmap\u5b50\u6a21\u5757\u662fLinux\u5185\u6838ARM64\u67b6\u6784\u5185\u5b58\u7ba1\u7406\u5b50\u7cfb\u7edf\u4e2d\u5b9e\u73b0\u5185\u5b58\u6620\u5c04\u7ba1\u7406\u7684\u6838\u5fc3\u7ec4\u4ef6&#xff0c;\u5305\u542bmmap.c\u6587\u4ef6\u3002\u8be5\u6a21\u5757\u4f5c\u4e3aARM64\u5e73\u53f0\u865a\u62df\u5185\u5b58\u6620\u5c04\u7684\u5173\u952e\u5b9e\u73b0&#xff0c;\u63d0\u4f9b\u4e86\u5b8c\u6574\u7684\u5730\u5740\u7a7a\u95f4\u7ba1\u7406\u3001\u5185\u5b58\u6620\u5c04\u5efa\u7acb\u3001\u6587\u4ef6\u6620\u5c04\u652f\u6301\u548c\u5171\u4eab\u5185\u5b58\u673a\u5236&#xff0c;\u662f\u7528\u6237\u7a7a\u95f4\u548c\u5185\u6838\u7a7a\u95f4\u5185\u5b58\u4ea4\u4e92\u7684\u6865\u6881\u3002<\/p>\n<p>\u2003\u2003mmap\u5b50\u6a21\u5757\u5b9e\u73b0\u4e86Linux\u865a\u62df\u5185\u5b58\u7cfb\u7edf\u7684\u6838\u5fc3\u62bd\u8c61&#xff0c;\u5305\u62ec\u533f\u540d\u6620\u5c04\u3001\u6587\u4ef6\u6620\u5c04\u3001\u5171\u4eab\u6620\u5c04\u3001\u79c1\u6709\u6620\u5c04\u7b49\u5404\u79cd\u6620\u5c04\u7c7b\u578b\u7684\u652f\u6301\u3002\u8be5\u6a21\u5757\u4f5c\u4e3a\u7cfb\u7edf\u8c03\u7528\u7684\u6838\u5fc3\u5b9e\u73b0&#xff0c;\u4e3a\u5e94\u7528\u7a0b\u5e8f\u63d0\u4f9b\u4e86\u7edf\u4e00\u7684\u5185\u5b58\u8bbf\u95ee\u63a5\u53e3&#xff0c;\u652f\u6301\u52a8\u6001\u5185\u5b58\u5206\u914d\u3001\u5927\u6587\u4ef6\u6620\u5c04\u3001\u8fdb\u7a0b\u95f4\u901a\u4fe1\u7b49\u5173\u952e\u529f\u80fd&#xff0c;\u662f\u73b0\u4ee3\u64cd\u4f5c\u7cfb\u7edf\u5185\u5b58\u7ba1\u7406\u7684\u91cd\u8981\u7ec4\u6210\u90e8\u5206\u3002<\/p>\n<p>\u2003\u2003\u6a21\u5757\u7684\u8bbe\u8ba1\u4f53\u73b0\u4e86\u5185\u5b58\u6620\u5c04\u7ba1\u7406\u7684\u590d\u6742\u6027\u548c\u7075\u6d3b\u6027\u8981\u6c42&#xff0c;\u901a\u8fc7\u7cbe\u5fc3\u8bbe\u8ba1\u7684\u6620\u5c04\u7b97\u6cd5\u548c\u6743\u9650\u63a7\u5236\u673a\u5236&#xff0c;\u5728\u4fdd\u8bc1\u5185\u5b58\u8bbf\u95ee\u5b89\u5168\u6027\u7684\u540c\u65f6\u5b9e\u73b0\u4e86\u9ad8\u6548\u7684\u865a\u62df\u5185\u5b58\u7ba1\u7406&#xff0c;\u662fARM64\u5185\u5b58\u5b50\u7cfb\u7edf\u7528\u6237\u63a5\u53e3\u7684\u6838\u5fc3\u3002<\/p>\n<h2>2. 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ms\\&#8221;,verdana,arial,sans-serif;}<\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"nodeLabel\"><\/p>\n<p>ARM64 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markdown-node-label\"><\/p>\n<p>PermissionManager<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;may_expand_vm()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;security_mmap_addr()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;validate_mmap_request()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;check_mmap_permissions()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>VMAManager<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;vma_merge()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;split_vma()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;insert_vm_struct()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;remove_vma()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;find_vma_intersection()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>AddressSpaceManager<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;expand_downwards()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;expand_upwards()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;arch_unmapped_area()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;unmapped_area()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;unmapped_area_topdown()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>MemoryRegion<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;vm_area_struct<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;vm_start<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;vm_end<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;vm_flags<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;vm_file<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;vm_pgoff<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>FileMapping<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;file-&gt;f_op-&gt;mmap()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;generic_file_mmap()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;mmap_region()<\/p>\n<p><\/span><\/p>\n<p>          <span class=\"nodeLabel markdown-node-label\"><\/p>\n<p>&#043;setup_mapping()<\/p>\n<p><\/span><\/p>\n<h2>5. \u6e90\u7801\u6df1\u5ea6\u5206\u6790<\/h2>\n<h3>5.1 ARM64\u5185\u5b58\u6620\u5c04\u67b6\u6784\u5206\u6790<\/h3>\n<h4>5.1.1 mmap\u7cfb\u7edf\u8c03\u7528\u5b9e\u73b0<\/h4>\n<p>\u2003\u2003ARM64 mmap\u7cfb\u7edf\u8c03\u7528\u7684\u6838\u5fc3\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ ARM64 mmap\u7cfb\u7edf\u8c03\u7528\u4e3b\u51fd\u6570<\/span><br \/>\n<span class=\"token function\">SYSCALL_DEFINE6<\/span><span class=\"token punctuation\">(<\/span>mmap<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span><br \/>\n                <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span> prot<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">,<\/span><br \/>\n                <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span> fd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span> off<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u53c2\u6570\u9a8c\u8bc1<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">unlikely<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>prot <span class=\"token operator\">&amp;<\/span> <span class=\"token operator\">~<\/span><span class=\"token punctuation\">(<\/span>PROT_READ <span class=\"token operator\">|<\/span> PROT_WRITE <span class=\"token operator\">|<\/span> PROT_EXEC <span class=\"token operator\">|<\/span> PROT_SEM<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EINVAL<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">unlikely<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_HUGE_MASK<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_HUGE_MASK<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> MAP_HUGE_2MB <span class=\"token operator\">&amp;&amp;<\/span><br \/>\n                 <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_HUGE_MASK<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> MAP_HUGE_1GB<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EINVAL<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u957f\u5ea6\u68c0\u67e5<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">unlikely<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> addr<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">unlikely<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&gt;<\/span> TASK_SIZE <span class=\"token operator\">&#8211;<\/span> PAGE_SIZE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>ENOMEM<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5730\u5740\u5bf9\u9f50\u68c0\u67e5<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">unlikely<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_FIXED<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token punctuation\">(<\/span>addr <span class=\"token operator\">&amp;<\/span> <span class=\"token operator\">~<\/span>PAGE_MASK<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EINVAL<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6743\u9650\u68c0\u67e5<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">unlikely<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token function\">access_ok<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EFAULT<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8c03\u7528\u6838\u5fc3mmap\u51fd\u6570<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">ksys_mmap_pgoff<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> prot<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">,<\/span> fd<span class=\"token punctuation\">,<\/span><br \/>\n                          off <span class=\"token operator\">&gt;&gt;<\/span> PAGE_SHIFT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ mmap\u6838\u5fc3\u5b9e\u73b0\u51fd\u6570<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">ksys_mmap_pgoff<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> len<span class=\"token punctuation\">,<\/span><br \/>\n                             <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> prot<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">,<\/span><br \/>\n                             <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> fd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> pgoff<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span>file <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> retval<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u83b7\u53d6\u6587\u4ef6\u5bf9\u8c61<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_ANONYMOUS<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        file <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fget<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>file<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EBADF<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6267\u884cmmap\u64cd\u4f5c<\/span><br \/>\n    retval <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">vm_mmap_pgoff<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> prot<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">,<\/span> pgoff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u91ca\u653e\u6587\u4ef6\u5f15\u7528<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token function\">fput<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> retval<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u865a\u62df\u5185\u5b58\u6620\u5c04\u6838\u5fc3\u51fd\u6570<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">vm_mmap_pgoff<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span>file<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span><br \/>\n                           <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> prot<span class=\"token punctuation\">,<\/span><br \/>\n                           <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> pgoff<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> ret<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm <span class=\"token operator\">&#061;<\/span> current<span class=\"token operator\">-&gt;<\/span>mm<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5730\u5740\u7a7a\u95f4\u9501\u5b9a<\/span><br \/>\n    <span class=\"token function\">down_write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>mm<span class=\"token operator\">-&gt;<\/span>mmap_sem<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6267\u884c\u6620\u5c04<\/span><br \/>\n    ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">do_mmap_pgoff<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> prot<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">,<\/span> pgoff<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>populate<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5730\u5740\u7a7a\u95f4\u89e3\u9501<\/span><br \/>\n    <span class=\"token function\">up_write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>mm<span class=\"token operator\">-&gt;<\/span>mmap_sem<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u9875\u9762\u586b\u5145&#xff08;\u5982\u679c\u9700\u8981&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>ret <span class=\"token operator\">&amp;&amp;<\/span> populate<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token function\">mm_populate<\/span><span class=\"token punctuation\">(<\/span>ret<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> populate<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> ret<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u2003\u2003mmap\u7cfb\u7edf\u8c03\u7528\u7279\u70b9&#xff1a;<\/p>\n<p>\u2003\u2003\u2003\u20031. \u53c2\u6570\u9a8c\u8bc1&#xff1a;\u4e25\u683c\u7684\u53c2\u6570\u68c0\u67e5\u548c\u6743\u9650\u9a8c\u8bc1 \u2003\u2003\u2003\u20032. \u6587\u4ef6\u5904\u7406&#xff1a;\u6587\u4ef6\u63cf\u8ff0\u7b26\u5230\u6587\u4ef6\u5bf9\u8c61\u7684\u8f6c\u6362 \u2003\u2003\u2003\u20033. \u5730\u5740\u7a7a\u95f4\u540c\u6b65&#xff1a;\u4f7f\u7528\u8bfb\u5199\u4fe1\u53f7\u91cf\u4fdd\u62a4\u5730\u5740\u7a7a\u95f4 \u2003\u2003\u2003\u20034. \u9875\u9762\u586b\u5145&#xff1a;\u6309\u9700\u586b\u5145\u6620\u5c04\u7684\u9875\u9762<\/p>\n<h4>5.1.2 \u5730\u5740\u7a7a\u95f4\u5206\u914d<\/h4>\n<p>\u2003\u2003\u5730\u5740\u7a7a\u95f4\u5206\u914d\u7684\u6838\u5fc3\u7b97\u6cd5&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u83b7\u53d6\u672a\u6620\u5c04\u533a\u57df\u7684\u51fd\u6570<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">get_unmapped_area<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span>file<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span><br \/>\n                               <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> pgoff<span class=\"token punctuation\">,<\/span><br \/>\n                               <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>get_area<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                             <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u9009\u62e9\u5408\u9002\u7684\u5206\u914d\u51fd\u6570<\/span><br \/>\n    get_area <span class=\"token operator\">&#061;<\/span> current<span class=\"token operator\">-&gt;<\/span>mm<span class=\"token operator\">-&gt;<\/span>get_unmapped_area<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>get_area<span class=\"token punctuation\">)<\/span><br \/>\n        get_area <span class=\"token operator\">&#061;<\/span> arch_get_unmapped_area<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5982\u679c\u6307\u5b9a\u4e86\u5730\u5740&#xff0c;\u5c1d\u8bd5\u56fa\u5b9a\u6620\u5c04<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_FIXED<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">get_area<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> pgoff<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> addr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5c1d\u8bd5\u81ea\u9876\u5411\u4e0b\u5206\u914d<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&gt;<\/span> current<span class=\"token operator\">-&gt;<\/span>mm<span class=\"token operator\">-&gt;<\/span>mmap_base<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">get_area<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> pgoff<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token function\">IS_ERR_VALUE<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> addr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u81ea\u5e95\u5411\u4e0a\u5206\u914d<\/span><br \/>\n    addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">vm_unmapped_area<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>current<span class=\"token operator\">-&gt;<\/span>mm<span class=\"token operator\">-&gt;<\/span>mm_rb<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> pgoff<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_FIXED<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> addr <span class=\"token operator\">&amp;<\/span> <span class=\"token operator\">~<\/span>PAGE_MASK<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">vm_unmapped_area_topdown<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>current<span class=\"token operator\">-&gt;<\/span>mm<span class=\"token operator\">-&gt;<\/span>mm_rb<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> pgoff<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> addr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u81ea\u5e95\u5411\u4e0a\u5730\u5740\u5206\u914d<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">vm_unmapped_area<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">rb_root<\/span> <span class=\"token operator\">*<\/span>root<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span><br \/>\n                              <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> pgoff<span class=\"token punctuation\">,<\/span><br \/>\n                              <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm <span class=\"token operator\">&#061;<\/span> current<span class=\"token operator\">-&gt;<\/span>mm<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> start_addr<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u786e\u5b9a\u8d77\u59cb\u5730\u5740<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_FIXED<span class=\"token punctuation\">)<\/span><br \/>\n        start_addr <span class=\"token operator\">&#061;<\/span> addr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        start_addr <span class=\"token operator\">&#061;<\/span> addr<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>start_addr <span class=\"token operator\">&amp;<\/span> <span class=\"token punctuation\">(<\/span>shmlba <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            start_addr <span class=\"token operator\">&amp;&#061;<\/span> <span class=\"token operator\">~<\/span><span class=\"token punctuation\">(<\/span>shmlba <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        start_addr <span class=\"token operator\">&#061;<\/span> mm<span class=\"token operator\">-&gt;<\/span>mmap_base<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u67e5\u627e\u5408\u9002\u7684\u7a7a\u95f2\u533a\u57df<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">unmapped_area<\/span><span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">,<\/span> start_addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u81ea\u9876\u5411\u4e0b\u5730\u5740\u5206\u914d<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">unmapped_area_topdown<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">rb_root<\/span> <span class=\"token operator\">*<\/span>root<span class=\"token punctuation\">,<\/span><br \/>\n                                   <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> len<span class=\"token punctuation\">,<\/span><br \/>\n                                   <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> pgoff<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm <span class=\"token operator\">&#061;<\/span> current<span class=\"token operator\">-&gt;<\/span>mm<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> start_addr<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u4ece\u9ad8\u5730\u5740\u5f00\u59cb\u5206\u914d<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_FIXED<span class=\"token punctuation\">)<\/span><br \/>\n        start_addr <span class=\"token operator\">&#061;<\/span> addr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        start_addr <span class=\"token operator\">&#061;<\/span> mm<span class=\"token operator\">-&gt;<\/span>free_area_cache<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>start_addr <span class=\"token operator\">&amp;<\/span> <span class=\"token punctuation\">(<\/span>shmlba <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            start_addr <span class=\"token operator\">&amp;&#061;<\/span> <span class=\"token operator\">~<\/span><span class=\"token punctuation\">(<\/span>shmlba <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u67e5\u627e\u5408\u9002\u7684\u7a7a\u95f2\u533a\u57df<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">unmapped_area<\/span><span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">,<\/span> start_addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u2003\u2003\u5730\u5740\u5206\u914d\u7279\u70b9&#xff1a;<\/p>\n<p>\u2003\u2003\u2003\u20031. \u591a\u79cd\u7b56\u7565&#xff1a;\u81ea\u5e95\u5411\u4e0a\u548c\u81ea\u9876\u5411\u4e0b\u4e24\u79cd\u5206\u914d\u7b56\u7565 \u2003\u2003\u2003\u20032. \u56fa\u5b9a\u6620\u5c04&#xff1a;\u652f\u6301\u56fa\u5b9a\u5730\u5740\u6620\u5c04 \u2003\u2003\u2003\u20033. \u5bf9\u9f50\u5904\u7406&#xff1a;\u8003\u8651\u5171\u4eab\u5185\u5b58\u5bf9\u9f50\u8981\u6c42\u7684\u5904\u7406 \u2003\u2003\u2003\u20034. \u7f13\u5b58\u4f18\u5316&#xff1a;\u4f7f\u7528free_area_cache\u4f18\u5316\u67e5\u627e\u6027\u80fd<\/p>\n<h3>5.2 \u5185\u5b58\u6620\u5c04\u5efa\u7acb\u5206\u6790<\/h3>\n<h4>5.2.1 VMA\u521b\u5efa\u548c\u7ba1\u7406<\/h4>\n<p>\u2003\u2003\u865a\u62df\u5185\u5b58\u533a\u57df\u521b\u5efa\u7684\u6838\u5fc3\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u6267\u884c\u5185\u5b58\u6620\u5c04\u7684\u6838\u5fc3\u51fd\u6570<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">do_mmap_pgoff<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span>file<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span><br \/>\n                           <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> prot<span class=\"token punctuation\">,<\/span><br \/>\n                           <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> pgoff<span class=\"token punctuation\">,<\/span><br \/>\n                           <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">list_head<\/span> <span class=\"token operator\">*<\/span>uf<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm <span class=\"token operator\">&#061;<\/span> current<span class=\"token operator\">-&gt;<\/span>mm<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>vma<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> charged <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u9a8c\u8bc1\u53c2\u6570<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>len<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EINVAL<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8ba1\u7b97\u9875\u9762\u6570\u91cf<\/span><br \/>\n    len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">PAGE_ALIGN<\/span><span class=\"token punctuation\">(<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>len<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>ENOMEM<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u83b7\u53d6\u672a\u6620\u5c04\u533a\u57df<\/span><br \/>\n    addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">get_unmapped_area<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> pgoff<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">IS_ERR_VALUE<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> addr<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5RLIMIT_AS\u9650\u5236<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token function\">may_expand_vm<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">,<\/span> len <span class=\"token operator\">&gt;&gt;<\/span> PAGE_SHIFT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>ENOMEM<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u4e3a\u6587\u4ef6\u6620\u5c04\u9884\u5145\u7535<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>file <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_ANONYMOUS<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">vm_mmap_pgoff_charge<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>ENOMEM<span class=\"token punctuation\">;<\/span><br \/>\n        charged <span class=\"token operator\">&#061;<\/span> len<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efaVMA<\/span><br \/>\n    vma <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">vm_area_alloc<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>vma<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>charged<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token function\">vm_mmap_pgoff_uncharge<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">,<\/span> charged<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>ENOMEM<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521d\u59cb\u5316VMA<\/span><br \/>\n    vma<span class=\"token operator\">-&gt;<\/span>vm_start <span class=\"token operator\">&#061;<\/span> addr<span class=\"token punctuation\">;<\/span><br \/>\n    vma<span class=\"token operator\">-&gt;<\/span>vm_end <span class=\"token operator\">&#061;<\/span> addr <span class=\"token operator\">&#043;<\/span> len<span class=\"token punctuation\">;<\/span><br \/>\n    vma<span class=\"token operator\">-&gt;<\/span>vm_flags <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">calc_vm_prot_bits<\/span><span class=\"token punctuation\">(<\/span>prot<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">|<\/span><br \/>\n                   <span class=\"token function\">calc_vm_flag_bits<\/span><span class=\"token punctuation\">(<\/span>flags<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">|<\/span><br \/>\n                   mm<span class=\"token operator\">-&gt;<\/span>def_flags <span class=\"token operator\">|<\/span><br \/>\n                   VM_MAYREAD <span class=\"token operator\">|<\/span> VM_MAYWRITE <span class=\"token operator\">|<\/span> VM_MAYEXEC<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        vma<span class=\"token operator\">-&gt;<\/span>vm_file <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">get_file<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        vma<span class=\"token operator\">-&gt;<\/span>vm_pgoff <span class=\"token operator\">&#061;<\/span> pgoff<span class=\"token punctuation\">;<\/span><br \/>\n        error <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">call_mmap<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">,<\/span> vma<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        addr <span class=\"token operator\">&#061;<\/span> error<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_SHARED<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        error <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">shmem_zero_setup<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">vm_area_free<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>charged<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token function\">vm_mmap_pgoff_uncharge<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">,<\/span> charged<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> error<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u63d2\u5165VMA\u5230\u5730\u5740\u7a7a\u95f4<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">mmap_region<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">,<\/span> vma<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> addr<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6620\u5c04\u5931\u8d25&#xff0c;\u6e05\u7406\u8d44\u6e90<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>charged<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token function\">vm_mmap_pgoff_uncharge<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">,<\/span> charged<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">vm_area_free<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>ENOMEM<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6620\u5c04\u533a\u57df\u5efa\u7acb<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">mmap_region<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span>file<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span><br \/>\n                         <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">,<\/span><br \/>\n                         <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>vma<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm <span class=\"token operator\">&#061;<\/span> current<span class=\"token operator\">-&gt;<\/span>mm<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>prev<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span>next<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u67e5\u627e\u76f8\u90bbVMA<\/span><br \/>\n    prev <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">find_vma_prev<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>next<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u662f\u5426\u53ef\u4ee5\u5408\u5e76<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>prev <span class=\"token operator\">&amp;&amp;<\/span> prev<span class=\"token operator\">-&gt;<\/span>vm_end <span class=\"token operator\">&#061;&#061;<\/span> addr <span class=\"token operator\">&amp;&amp;<\/span><br \/>\n        <span class=\"token function\">can_vma_merge_after<\/span><span class=\"token punctuation\">(<\/span>prev<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> next<span class=\"token punctuation\">,<\/span><br \/>\n                           vma<span class=\"token operator\">-&gt;<\/span>vm_flags<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> file<span class=\"token punctuation\">,<\/span> pgoff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6269\u5c55\u524d\u4e00\u4e2aVMA<\/span><br \/>\n        prev<span class=\"token operator\">-&gt;<\/span>vm_end <span class=\"token operator\">&#061;<\/span> addr <span class=\"token operator\">&#043;<\/span> len<span class=\"token punctuation\">;<\/span><br \/>\n        prev<span class=\"token operator\">-&gt;<\/span>vm_flags <span class=\"token operator\">|&#061;<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_flags<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">vm_area_free<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> addr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u63d2\u5165\u65b0\u7684VMA<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">insert_vm_struct<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">,<\/span> vma<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">vm_area_free<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>ENOMEM<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> addr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u2003\u2003VMA\u7ba1\u7406\u7279\u70b9&#xff1a;<\/p>\n<p>\u2003\u2003\u2003\u20031. \u52a8\u6001\u521b\u5efa&#xff1a;\u6309\u9700\u521b\u5efa\u865a\u62df\u5185\u5b58\u533a\u57df \u2003\u2003\u2003\u20032. \u53c2\u6570\u521d\u59cb\u5316&#xff1a;\u5b8c\u6574\u7684VMA\u5c5e\u6027\u8bbe\u7f6e \u2003\u2003\u2003\u20033. \u6587\u4ef6\u5173\u8054&#xff1a;\u6587\u4ef6\u6620\u5c04\u7684\u6587\u4ef6\u5bf9\u8c61\u5173\u8054 \u2003\u2003\u2003\u20034. \u533a\u57df\u5408\u5e76&#xff1a;\u76f8\u90bbVMA\u7684\u667a\u80fd\u5408\u5e76\u4f18\u5316<\/p>\n<h4>5.2.2 \u6587\u4ef6\u6620\u5c04\u5904\u7406<\/h4>\n<p>\u2003\u2003\u6587\u4ef6\u6620\u5c04\u7684\u6838\u5fc3\u5904\u7406\u903b\u8f91&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u6587\u4ef6mmap\u64cd\u4f5c\u8c03\u7528<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">call_mmap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span>file<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>vma<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>mmap<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> error <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span>ENODEV<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u83b7\u53d6\u6587\u4ef6\u7684mmap\u64cd\u4f5c<\/span><br \/>\n    mmap <span class=\"token operator\">&#061;<\/span> file<span class=\"token operator\">-&gt;<\/span>f_op<span class=\"token operator\">-&gt;<\/span>mmap<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>mmap<span class=\"token punctuation\">)<\/span><br \/>\n        error <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">mmap<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">,<\/span> vma<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5982\u679c\u6587\u4ef6\u7cfb\u7edf\u4e0d\u652f\u6301&#xff0c;\u4f7f\u7528\u901a\u7528\u6587\u4ef6\u6620\u5c04<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>error <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span>ENODEV<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        error <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">generic_file_mmap<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">,<\/span> vma<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> error<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u901a\u7528\u6587\u4ef6\u6620\u5c04<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">generic_file_mmap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span>file<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>vma<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">address_space<\/span> <span class=\"token operator\">*<\/span>mapping <span class=\"token operator\">&#061;<\/span> file<span class=\"token operator\">-&gt;<\/span>f_mapping<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u6587\u4ef6\u662f\u5426\u53ef\u6620\u5c04<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>mapping<span class=\"token operator\">-&gt;<\/span>a_ops<span class=\"token operator\">-&gt;<\/span>readpage<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>ENOEXEC<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8bbe\u7f6eVMA\u64cd\u4f5c<\/span><br \/>\n    vma<span class=\"token operator\">-&gt;<\/span>vm_ops <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>generic_file_vm_ops<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5bf9\u4e8e\u53ef\u5199\u6620\u5c04&#xff0c;\u8bbe\u7f6e\u810f\u9875\u8ddf\u8e2a<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>vma<span class=\"token operator\">-&gt;<\/span>vm_flags <span class=\"token operator\">&amp;<\/span> VM_MAYWRITE<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u786e\u4fdd\u6587\u4ef6\u7cfb\u7edf\u652f\u6301\u5199\u64cd\u4f5c<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>mapping<span class=\"token operator\">-&gt;<\/span>a_ops<span class=\"token operator\">-&gt;<\/span>writepage<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EINVAL<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5bf9\u4e8e\u5171\u4eab\u53ef\u5199\u6620\u5c04&#xff0c;\u8bbe\u7f6eMS_INVALIDATE<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token operator\">-&gt;<\/span>vm_flags <span class=\"token operator\">&amp;<\/span> <span class=\"token punctuation\">(<\/span>VM_MAYSHARE <span class=\"token operator\">|<\/span> VM_MAYWRITE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token punctuation\">(<\/span>VM_MAYSHARE <span class=\"token operator\">|<\/span> VM_MAYWRITE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        mapping<span class=\"token operator\">-&gt;<\/span>flags <span class=\"token operator\">|&#061;<\/span> AS_MM_ALL_LOCKS<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ mmap\u533a\u57df\u5904\u7406<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">mmap_region<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span>file<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span><br \/>\n               <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">,<\/span><br \/>\n               <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>vma<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm <span class=\"token operator\">&#061;<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_mm<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> error<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8c03\u7528\u6587\u4ef6\u7cfb\u7edf\u7684mmap_region&#xff08;\u5982\u679c\u652f\u6301&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>file <span class=\"token operator\">&amp;&amp;<\/span> file<span class=\"token operator\">-&gt;<\/span>f_op<span class=\"token operator\">-&gt;<\/span>mmap_region<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        error <span class=\"token operator\">&#061;<\/span> file<span class=\"token operator\">-&gt;<\/span>f_op<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">mmap_region<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">,<\/span> vma<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>error<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">goto<\/span> out<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5efa\u7acb\u9875\u8868\u6620\u5c04<\/span><br \/>\n    error <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">remap_pfn_range<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_pgoff<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_page_prot<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> error<span class=\"token punctuation\">;<\/span><\/p>\n<p>out<span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u66f4\u65b0\u7edf\u8ba1\u4fe1\u606f<\/span><br \/>\n    mm<span class=\"token operator\">-&gt;<\/span>total_vm <span class=\"token operator\">&#043;&#061;<\/span> len <span class=\"token operator\">&gt;&gt;<\/span> PAGE_SHIFT<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_SHARED<span class=\"token punctuation\">)<\/span><br \/>\n        mm<span class=\"token operator\">-&gt;<\/span>shared_vm <span class=\"token operator\">&#043;&#061;<\/span> len <span class=\"token operator\">&gt;&gt;<\/span> PAGE_SHIFT<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">else<\/span><br \/>\n        mm<span class=\"token operator\">-&gt;<\/span>anon_vm <span class=\"token operator\">&#043;&#061;<\/span> len <span class=\"token operator\">&gt;&gt;<\/span> PAGE_SHIFT<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u2003\u2003\u6587\u4ef6\u6620\u5c04\u7279\u70b9&#xff1a;<\/p>\n<p>\u2003\u2003\u2003\u20031. \u6587\u4ef6\u7cfb\u7edf\u94a9\u5b50&#xff1a;\u8c03\u7528\u6587\u4ef6\u7cfb\u7edf\u7684mmap\u64cd\u4f5c \u2003\u2003\u2003\u20032. \u901a\u7528\u6620\u5c04&#xff1a;\u4e0d\u652f\u6301\u4e13\u7528mmap\u7684\u6587\u4ef6\u4f7f\u7528\u901a\u7528\u5b9e\u73b0 \u2003\u2003\u2003\u20033. \u9875\u8868\u6620\u5c04&#xff1a;\u5efa\u7acb\u865a\u62df\u5730\u5740\u5230\u7269\u7406\u9875\u9762\u7684\u6620\u5c04 \u2003\u2003\u2003\u20034. \u7edf\u8ba1\u66f4\u65b0&#xff1a;\u66f4\u65b0\u5185\u5b58\u4f7f\u7528\u7edf\u8ba1\u4fe1\u606f<\/p>\n<h3>5.3 \u6620\u5c04\u7c7b\u578b\u548c\u6743\u9650\u7ba1\u7406\u5206\u6790<\/h3>\n<h4>5.3.1 \u6620\u5c04\u7c7b\u578b\u5904\u7406<\/h4>\n<p>\u2003\u2003\u4e0d\u540c\u6620\u5c04\u7c7b\u578b\u7684\u5904\u7406\u903b\u8f91&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u8ba1\u7b97\u865a\u62df\u5185\u5b58\u4fdd\u62a4\u4f4d<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">calc_vm_prot_bits<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> prot<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> vm_prot <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u57fa\u672c\u6743\u9650<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>prot <span class=\"token operator\">&amp;<\/span> PROT_READ<span class=\"token punctuation\">)<\/span><br \/>\n        vm_prot <span class=\"token operator\">|&#061;<\/span> VM_READ<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>prot <span class=\"token operator\">&amp;<\/span> PROT_WRITE<span class=\"token punctuation\">)<\/span><br \/>\n        vm_prot <span class=\"token operator\">|&#061;<\/span> VM_WRITE<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>prot <span class=\"token operator\">&amp;<\/span> PROT_EXEC<span class=\"token punctuation\">)<\/span><br \/>\n        vm_prot <span class=\"token operator\">|&#061;<\/span> VM_EXEC<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5904\u7406\u7279\u6b8a\u6743\u9650<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>prot <span class=\"token operator\">&amp;<\/span> PROT_SEM<span class=\"token punctuation\">)<\/span><br \/>\n        vm_prot <span class=\"token operator\">|&#061;<\/span> VM_SEM<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ ARM64\u7279\u5b9a\u7684\u6743\u9650\u5904\u7406<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">IS_ENABLED<\/span><span class=\"token punctuation\">(<\/span>CONFIG_ARM64_SW_TTBR0_PAN<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ PAN&#xff08;Privileged Access Never&#xff09;\u5904\u7406<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_SHARED<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token punctuation\">(<\/span>prot <span class=\"token operator\">&amp;<\/span> PROT_EXEC<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            vm_prot <span class=\"token operator\">|&#061;<\/span> VM_ARM64_BTI<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> vm_prot<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8ba1\u7b97\u865a\u62df\u5185\u5b58\u6807\u5fd7\u4f4d<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">calc_vm_flag_bits<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> vm_flags <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6620\u5c04\u7c7b\u578b\u6807\u5fd7<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_SHARED<span class=\"token punctuation\">)<\/span><br \/>\n        vm_flags <span class=\"token operator\">|&#061;<\/span> VM_SHARED<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">else<\/span><br \/>\n        vm_flags <span class=\"token operator\">|&#061;<\/span> VM_PRIVATE<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5176\u4ed6\u6807\u5fd7<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_FIXED<span class=\"token punctuation\">)<\/span><br \/>\n        vm_flags <span class=\"token operator\">|&#061;<\/span> VM_FIXED<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_GROWSDOWN<span class=\"token punctuation\">)<\/span><br \/>\n        vm_flags <span class=\"token operator\">|&#061;<\/span> VM_GROWSDOWN<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_GROWSUP<span class=\"token punctuation\">)<\/span><br \/>\n        vm_flags <span class=\"token operator\">|&#061;<\/span> VM_GROWSUP<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_LOCKED<span class=\"token punctuation\">)<\/span><br \/>\n        vm_flags <span class=\"token operator\">|&#061;<\/span> VM_LOCKED<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_HUGETLB<span class=\"token punctuation\">)<\/span><br \/>\n        vm_flags <span class=\"token operator\">|&#061;<\/span> VM_HUGETLB<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_NONBLOCK<span class=\"token punctuation\">)<\/span><br \/>\n        vm_flags <span class=\"token operator\">|&#061;<\/span> VM_NONBLOCK<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_NORESERVE<span class=\"token punctuation\">)<\/span><br \/>\n        vm_flags <span class=\"token operator\">|&#061;<\/span> VM_NORESERVE<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_POPULATE<span class=\"token punctuation\">)<\/span><br \/>\n        vm_flags <span class=\"token operator\">|&#061;<\/span> VM_POPULATE<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> vm_flags<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u533f\u540d\u6620\u5c04\u5904\u7406<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">shmem_zero_setup<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>vma<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span>file<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> error<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efa\u533f\u540d\u6587\u4ef6<\/span><br \/>\n    error <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">shmem_zero_setup_mapping<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">,<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_start<span class=\"token punctuation\">,<\/span><br \/>\n                                   <span class=\"token punctuation\">(<\/span>vma<span class=\"token operator\">-&gt;<\/span>vm_end <span class=\"token operator\">&#8211;<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_start<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;&gt;<\/span> PAGE_SHIFT<span class=\"token punctuation\">,<\/span><br \/>\n                                   vma<span class=\"token operator\">-&gt;<\/span>vm_flags <span class=\"token operator\">&amp;<\/span> VM_SHARED<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> error<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u83b7\u53d6\u6587\u4ef6\u5bf9\u8c61<\/span><br \/>\n    file <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">shmem_file_setup<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;dev\/zero&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> VM_SHARED<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">IS_ERR<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">PTR_ERR<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8bbe\u7f6eVMA\u6587\u4ef6<\/span><br \/>\n    vma<span class=\"token operator\">-&gt;<\/span>vm_file <span class=\"token operator\">&#061;<\/span> file<span class=\"token punctuation\">;<\/span><br \/>\n    vma<span class=\"token operator\">-&gt;<\/span>vm_ops <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>shmem_vm_ops<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u2003\u2003\u6620\u5c04\u7c7b\u578b\u7279\u70b9&#xff1a;<\/p>\n<p>\u2003\u2003\u2003\u20031. \u6743\u9650\u8f6c\u6362&#xff1a;\u7528\u6237\u7a7a\u95f4\u6743\u9650\u5230\u5185\u6838VMA\u6743\u9650\u7684\u8f6c\u6362 \u2003\u2003\u2003\u20032. \u6807\u5fd7\u5904\u7406&#xff1a;\u5404\u79cd\u6620\u5c04\u6807\u5fd7\u7684\u6b63\u786e\u8bbe\u7f6e \u2003\u2003\u2003\u20033. \u533f\u540d\u6620\u5c04&#xff1a;\u4f7f\u7528\u5171\u4eab\u5185\u5b58\u5b9e\u73b0\u533f\u540d\u6620\u5c04 \u2003\u2003\u2003\u20034. \u7279\u6b8a\u5904\u7406&#xff1a;\u5927\u9875\u3001\u9501\u5b9a\u7b49\u7279\u6b8a\u6620\u5c04\u7c7b\u578b\u7684\u5904\u7406<\/p>\n<h4>5.3.2 \u5b89\u5168\u548c\u6743\u9650\u9a8c\u8bc1<\/h4>\n<p>\u2003\u2003\u6620\u5c04\u64cd\u4f5c\u7684\u5b89\u5168\u9a8c\u8bc1&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ mmap\u6743\u9650\u68c0\u67e5<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">security_mmap_addr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5b89\u5168\u6a21\u5757\u68c0\u67e5\u5730\u5740<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">security_mmap_addr_hook<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u9a8c\u8bc1mmap\u8bf7\u6c42<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">validate_mmap_request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span>file<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span><br \/>\n                         <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> prot<span class=\"token punctuation\">,<\/span><br \/>\n                         <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> pgoff<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u68c0\u67e5\u5730\u5740\u8303\u56f4<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">unlikely<\/span><span class=\"token punctuation\">(<\/span>addr <span class=\"token operator\">&gt;<\/span> TASK_SIZE <span class=\"token operator\">&#8211;<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EINVAL<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u957f\u5ea6\u9650\u5236<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">unlikely<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&gt;<\/span> TASK_SIZE <span class=\"token operator\">||<\/span> len <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EINVAL<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u5bf9\u9f50<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">unlikely<\/span><span class=\"token punctuation\">(<\/span>addr <span class=\"token operator\">&amp;<\/span> <span class=\"token operator\">~<\/span>PAGE_MASK<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EINVAL<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u6743\u9650\u7ec4\u5408\u7684\u6709\u6548\u6027<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">unlikely<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>prot <span class=\"token operator\">&amp;<\/span> PROT_WRITE<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span>file <span class=\"token operator\">||<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_ANONYMOUS<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EACCES<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u5171\u4eab\u6620\u5c04\u7684\u6743\u9650<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">unlikely<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_SHARED<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token punctuation\">(<\/span>prot <span class=\"token operator\">&amp;<\/span> PROT_WRITE<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span><br \/>\n                <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>file <span class=\"token operator\">||<\/span> <span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token operator\">-&gt;<\/span>f_mode <span class=\"token operator\">&amp;<\/span> FMODE_WRITE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EACCES<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u865a\u62df\u5185\u5b58\u6269\u5c55\u68c0\u67e5<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">may_expand_vm<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> npages<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> cur <span class=\"token operator\">&#061;<\/span> mm<span class=\"token operator\">-&gt;<\/span>total_vm<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> lim<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5RLIMIT_AS\u9650\u5236<\/span><br \/>\n    lim <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">rlimit<\/span><span class=\"token punctuation\">(<\/span>RLIMIT_AS<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;&gt;<\/span> PAGE_SHIFT<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cur <span class=\"token operator\">&#043;<\/span> npages <span class=\"token operator\">&gt;<\/span> lim<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u7cfb\u7edf\u9650\u5236<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>mm<span class=\"token operator\">-&gt;<\/span>total_vm <span class=\"token operator\">&#043;<\/span> npages <span class=\"token operator\">&gt;<\/span> sysctl_max_map_count<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u2003\u2003\u5b89\u5168\u9a8c\u8bc1\u7279\u70b9&#xff1a;<\/p>\n<p>\u2003\u2003\u2003\u20031. \u5730\u5740\u9a8c\u8bc1&#xff1a;\u5730\u5740\u8303\u56f4\u548c\u5bf9\u9f50\u7684\u68c0\u67e5 \u2003\u2003\u2003\u20032. \u6743\u9650\u9a8c\u8bc1&#xff1a;\u6587\u4ef6\u8bbf\u95ee\u6743\u9650\u7684\u9a8c\u8bc1 \u2003\u2003\u2003\u20033. \u8d44\u6e90\u9650\u5236&#xff1a;\u7cfb\u7edf\u8d44\u6e90\u4f7f\u7528\u9650\u5236\u7684\u68c0\u67e5 \u2003\u2003\u2003\u20034. \u5b89\u5168\u94a9\u5b50&#xff1a;\u5b89\u5168\u6a21\u5757\u7684\u6743\u9650\u68c0\u67e5<\/p>\n<h2>6. \u8bbe\u8ba1\u6a21\u5f0f\u5206\u6790<\/h2>\n<h3>6.1 \u7b56\u7565\u6a21\u5f0f\u5728\u6620\u5c04\u7c7b\u578b\u9009\u62e9\u4e2d\u7684\u4f53\u73b0<\/h3>\n<p>\u2003\u2003\u6620\u5c04\u7c7b\u578b\u9009\u62e9\u7684\u7b56\u7565\u6a21\u5f0f&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u6620\u5c04\u7b56\u7565\u63a5\u53e3<\/span><br \/>\ninterface MappingStrategy <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>MemoryRegion region<span class=\"token punctuation\">,<\/span> MappingRequest request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    boolean <span class=\"token function\">canHandle<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    String <span class=\"token function\">getStrategyName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">double<\/span> <span class=\"token function\">getMappingEfficiency<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    boolean <span class=\"token function\">supportsLazyAllocation<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u533f\u540d\u6620\u5c04\u7b56\u7565<\/span><br \/>\nclass AnonymousMappingStrategy implements MappingStrategy <span class=\"token punctuation\">{<\/span><br \/>\n    public <span class=\"token keyword\">int<\/span> <span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>MemoryRegion region<span class=\"token punctuation\">,<\/span> MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u533f\u540d\u6620\u5c04\u5b9e\u73b0<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">shmem_zero_setup<\/span><span class=\"token punctuation\">(<\/span>region<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public boolean <span class=\"token function\">canHandle<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">isAnonymous<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public String <span class=\"token function\">getStrategyName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;ANONYMOUS_MAPPING&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">double<\/span> <span class=\"token function\">getMappingEfficiency<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">0.95<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public boolean <span class=\"token function\">supportsLazyAllocation<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6587\u4ef6\u6620\u5c04\u7b56\u7565<\/span><br \/>\nclass FileMappingStrategy implements MappingStrategy <span class=\"token punctuation\">{<\/span><br \/>\n    public <span class=\"token keyword\">int<\/span> <span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>MemoryRegion region<span class=\"token punctuation\">,<\/span> MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6587\u4ef6\u6620\u5c04\u5b9e\u73b0<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">call_mmap<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getFile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> region<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public boolean <span class=\"token function\">canHandle<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasFile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">!<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">isAnonymous<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public String <span class=\"token function\">getStrategyName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;FILE_MAPPING&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">double<\/span> <span class=\"token function\">getMappingEfficiency<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">0.90<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public boolean <span class=\"token function\">supportsLazyAllocation<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8bbe\u5907\u6620\u5c04\u7b56\u7565<\/span><br \/>\nclass DeviceMappingStrategy implements MappingStrategy <span class=\"token punctuation\">{<\/span><br \/>\n    public <span class=\"token keyword\">int<\/span> <span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>MemoryRegion region<span class=\"token punctuation\">,<\/span> MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8bbe\u5907\u6620\u5c04\u5b9e\u73b0<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">remap_pfn_range<\/span><span class=\"token punctuation\">(<\/span>region<span class=\"token punctuation\">,<\/span> region<span class=\"token punctuation\">.<\/span><span class=\"token function\">getStart<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                              request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPfn<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> region<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                              region<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPageProt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public boolean <span class=\"token function\">canHandle<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">isDeviceMapping<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public String <span class=\"token function\">getStrategyName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;DEVICE_MAPPING&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">double<\/span> <span class=\"token function\">getMappingEfficiency<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">0.85<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public boolean <span class=\"token function\">supportsLazyAllocation<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> false<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8bbe\u5907\u6620\u5c04\u901a\u5e38\u9700\u8981\u9884\u5148\u5206\u914d<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u81ea\u9002\u5e94\u6620\u5c04\u7b56\u7565<\/span><br \/>\nclass AdaptiveMappingStrategy implements MappingStrategy <span class=\"token punctuation\">{<\/span><br \/>\n    private List<span class=\"token operator\">&lt;<\/span>MappingStrategy<span class=\"token operator\">&gt;<\/span> strategies<span class=\"token punctuation\">;<\/span><br \/>\n    private MappingStatistics stats<span class=\"token punctuation\">;<\/span><\/p>\n<p>    public <span class=\"token function\">AdaptiveMappingStrategy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        strategies <span class=\"token operator\">&#061;<\/span> Arrays<span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            new <span class=\"token function\">AnonymousMappingStrategy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            new <span class=\"token function\">FileMappingStrategy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            new <span class=\"token function\">DeviceMappingStrategy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        stats <span class=\"token operator\">&#061;<\/span> new <span class=\"token function\">MappingStatistics<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">int<\/span> <span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>MemoryRegion region<span class=\"token punctuation\">,<\/span> MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u9009\u62e9\u6700\u9002\u5408\u7684\u7b56\u7565<\/span><br \/>\n        MappingStrategy bestStrategy <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">selectBestStrategy<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">long<\/span> startTime <span class=\"token operator\">&#061;<\/span> System<span class=\"token punctuation\">.<\/span><span class=\"token function\">nanoTime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> result <span class=\"token operator\">&#061;<\/span> bestStrategy<span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>region<span class=\"token punctuation\">,<\/span> request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> mappingTime <span class=\"token operator\">&#061;<\/span> System<span class=\"token punctuation\">.<\/span><span class=\"token function\">nanoTime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> startTime<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u66f4\u65b0\u7edf\u8ba1\u4fe1\u606f<\/span><br \/>\n        stats<span class=\"token punctuation\">.<\/span><span class=\"token function\">recordMapping<\/span><span class=\"token punctuation\">(<\/span>bestStrategy<span class=\"token punctuation\">.<\/span><span class=\"token function\">getStrategyName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> result <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> mappingTime<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public boolean <span class=\"token function\">canHandle<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> strategies<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">anyMatch<\/span><span class=\"token punctuation\">(<\/span>s <span class=\"token operator\">-&gt;<\/span> s<span class=\"token punctuation\">.<\/span><span class=\"token function\">canHandle<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public String <span class=\"token function\">getStrategyName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;ADAPTIVE_MAPPING&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">double<\/span> <span class=\"token function\">getMappingEfficiency<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> stats<span class=\"token punctuation\">.<\/span><span class=\"token function\">getOverallEfficiency<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public boolean <span class=\"token function\">supportsLazyAllocation<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    private MappingStrategy <span class=\"token function\">selectBestStrategy<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> strategies<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span>s <span class=\"token operator\">-&gt;<\/span> s<span class=\"token punctuation\">.<\/span><span class=\"token function\">canHandle<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">.<\/span><span class=\"token function\">max<\/span><span class=\"token punctuation\">(<\/span>Comparator<span class=\"token punctuation\">.<\/span><span class=\"token function\">comparingDouble<\/span><span class=\"token punctuation\">(<\/span>s <span class=\"token operator\">-&gt;<\/span> <span class=\"token function\">calculateStrategyScore<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">,<\/span> request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">.<\/span><span class=\"token function\">orElse<\/span><span class=\"token punctuation\">(<\/span>new <span class=\"token function\">AnonymousMappingStrategy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    private <span class=\"token keyword\">double<\/span> <span class=\"token function\">calculateStrategyScore<\/span><span class=\"token punctuation\">(<\/span>MappingStrategy strategy<span class=\"token punctuation\">,<\/span> MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">double<\/span> efficiency <span class=\"token operator\">&#061;<\/span> stats<span class=\"token punctuation\">.<\/span><span class=\"token function\">getStrategyEfficiency<\/span><span class=\"token punctuation\">(<\/span>strategy<span class=\"token punctuation\">.<\/span><span class=\"token function\">getStrategyName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">double<\/span> lazyBonus <span class=\"token operator\">&#061;<\/span> strategy<span class=\"token punctuation\">.<\/span><span class=\"token function\">supportsLazyAllocation<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">prefersLazy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> <span class=\"token number\">0.1<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">0.0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> efficiency <span class=\"token operator\">&#043;<\/span> lazyBonus<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7b56\u7565\u9009\u62e9\u5668<\/span><br \/>\nclass MappingStrategySelector <span class=\"token punctuation\">{<\/span><br \/>\n    public <span class=\"token keyword\">static<\/span> MappingStrategy <span class=\"token function\">selectStrategy<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">,<\/span> SystemContext context<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">.<\/span><span class=\"token function\">supportsAdaptiveMapping<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> new <span class=\"token function\">AdaptiveMappingStrategy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">isDeviceMapping<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> new <span class=\"token function\">DeviceMappingStrategy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasFile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> new <span class=\"token function\">FileMappingStrategy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> new <span class=\"token function\">AnonymousMappingStrategy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>6.2 \u5de5\u5382\u6a21\u5f0f\u5728VMA\u521b\u5efa\u4e2d\u7684\u4f53\u73b0<\/h3>\n<p>\u2003\u2003VMA\u521b\u5efa\u7684\u5de5\u5382\u6a21\u5f0f&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ VMA\u5de5\u5382\u63a5\u53e3<\/span><br \/>\ninterface VMAFactory <span class=\"token punctuation\">{<\/span><br \/>\n    VMAArea <span class=\"token function\">createVMA<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    boolean <span class=\"token function\">canCreate<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    String <span class=\"token function\">getFactoryName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6807\u51c6VMA\u5de5\u5382<\/span><br \/>\nclass StandardVMAFactory implements VMAFactory <span class=\"token punctuation\">{<\/span><br \/>\n    public VMAArea <span class=\"token function\">createVMA<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        VMAArea vma <span class=\"token operator\">&#061;<\/span> new <span class=\"token function\">VMAArea<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u57fa\u672c\u5c5e\u6027<\/span><br \/>\n        vma<span class=\"token punctuation\">.<\/span><span class=\"token function\">setStartAddress<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAddr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        vma<span class=\"token punctuation\">.<\/span><span class=\"token function\">setSize<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        vma<span class=\"token punctuation\">.<\/span><span class=\"token function\">setProtection<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getProt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        vma<span class=\"token punctuation\">.<\/span><span class=\"token function\">setFlags<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getFlags<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8bbe\u7f6eVMA\u64cd\u4f5c<\/span><br \/>\n        vma<span class=\"token punctuation\">.<\/span><span class=\"token function\">setOperations<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">getStandardOperations<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> vma<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public boolean <span class=\"token function\">canCreate<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6807\u51c6\u5de5\u5382\u53ef\u4ee5\u5904\u7406\u6240\u6709\u8bf7\u6c42<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public String <span class=\"token function\">getFactoryName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;STANDARD_VMA&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    private VMAOperations <span class=\"token function\">getStandardOperations<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">isAnonymous<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> new <span class=\"token function\">AnonymousVMAOperations<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasFile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> new <span class=\"token function\">FileVMAOperations<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> new <span class=\"token function\">DefaultVMAOperations<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5927\u9875VMA\u5de5\u5382<\/span><br \/>\nclass HugePageVMAFactory implements VMAFactory <span class=\"token punctuation\">{<\/span><br \/>\n    public VMAArea <span class=\"token function\">createVMA<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        VMAArea vma <span class=\"token operator\">&#061;<\/span> new <span class=\"token function\">VMAArea<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u5927\u9875\u5c5e\u6027<\/span><br \/>\n        vma<span class=\"token punctuation\">.<\/span><span class=\"token function\">setStartAddress<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAddr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        vma<span class=\"token punctuation\">.<\/span><span class=\"token function\">setSize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">alignToHugePageSize<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        vma<span class=\"token punctuation\">.<\/span><span class=\"token function\">setProtection<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getProt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        vma<span class=\"token punctuation\">.<\/span><span class=\"token function\">setFlags<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getFlags<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">|<\/span> VM_HUGETLB<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u5927\u9875\u64cd\u4f5c<\/span><br \/>\n        vma<span class=\"token punctuation\">.<\/span><span class=\"token function\">setOperations<\/span><span class=\"token punctuation\">(<\/span>new <span class=\"token function\">HugePageVMAOperations<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> vma<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public boolean <span class=\"token function\">canCreate<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u68c0\u67e5\u662f\u5426\u652f\u6301\u5927\u9875\u4e14\u8bf7\u6c42\u4e86\u5927\u9875<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">systemSupportsHugePages<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span><br \/>\n               <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getFlags<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;<\/span> MAP_HUGETLB<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public String <span class=\"token function\">getFactoryName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;HUGE_PAGE_VMA&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    private <span class=\"token keyword\">long<\/span> <span class=\"token function\">alignToHugePageSize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">long<\/span> size<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> hugePageSize <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getHugePageSize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span>size <span class=\"token operator\">&#043;<\/span> hugePageSize <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;<\/span> <span class=\"token operator\">~<\/span><span class=\"token punctuation\">(<\/span>hugePageSize <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    private boolean <span class=\"token function\">systemSupportsHugePages<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">isHugePageSupported<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u56fa\u5b9a\u6620\u5c04VMA\u5de5\u5382<\/span><br \/>\nclass FixedVMAFactory implements VMAFactory <span class=\"token punctuation\">{<\/span><br \/>\n    public VMAArea <span class=\"token function\">createVMA<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        VMAArea vma <span class=\"token operator\">&#061;<\/span> new <span class=\"token function\">VMAArea<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u56fa\u5b9a\u5730\u5740\u6620\u5c04<\/span><br \/>\n        vma<span class=\"token punctuation\">.<\/span><span class=\"token function\">setStartAddress<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAddr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4f7f\u7528\u6307\u5b9a\u7684\u56fa\u5b9a\u5730\u5740<\/span><br \/>\n        vma<span class=\"token punctuation\">.<\/span><span class=\"token function\">setSize<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        vma<span class=\"token punctuation\">.<\/span><span class=\"token function\">setProtection<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getProt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        vma<span class=\"token punctuation\">.<\/span><span class=\"token function\">setFlags<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getFlags<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">|<\/span> VM_FIXED<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u56fa\u5b9a\u6620\u5c04\u64cd\u4f5c<\/span><br \/>\n        vma<span class=\"token punctuation\">.<\/span><span class=\"token function\">setOperations<\/span><span class=\"token punctuation\">(<\/span>new <span class=\"token function\">FixedVMAOperations<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> vma<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public boolean <span class=\"token function\">canCreate<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u68c0\u67e5\u662f\u5426\u4e3a\u56fa\u5b9a\u6620\u5c04\u8bf7\u6c42<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getFlags<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;<\/span> MAP_FIXED<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public String <span class=\"token function\">getFactoryName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;FIXED_VMA&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ VMA\u5de5\u5382\u7ba1\u7406\u5668<\/span><br \/>\nclass VMAFactoryManager <span class=\"token punctuation\">{<\/span><br \/>\n    private <span class=\"token keyword\">static<\/span> List<span class=\"token operator\">&lt;<\/span>VMAFactory<span class=\"token operator\">&gt;<\/span> factories<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        factories <span class=\"token operator\">&#061;<\/span> Arrays<span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            new <span class=\"token function\">FixedVMAFactory<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            new <span class=\"token function\">HugePageVMAFactory<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            new <span class=\"token function\">StandardVMAFactory<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u6807\u51c6\u5de5\u5382\u653e\u5728\u6700\u540e\u4f5c\u4e3afallback<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">static<\/span> VMAArea <span class=\"token function\">createVMA<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>VMAFactory factory <span class=\"token operator\">:<\/span> factories<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>factory<span class=\"token punctuation\">.<\/span><span class=\"token function\">canCreate<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> factory<span class=\"token punctuation\">.<\/span><span class=\"token function\">createVMA<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        throw new <span class=\"token function\">VMAFactoryException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;No suitable factory found for request&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">static<\/span> String <span class=\"token function\">getFactoryName<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>VMAFactory factory <span class=\"token operator\">:<\/span> factories<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>factory<span class=\"token punctuation\">.<\/span><span class=\"token function\">canCreate<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> factory<span class=\"token punctuation\">.<\/span><span class=\"token function\">getFactoryName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;UNKNOWN&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528\u5de5\u5382\u6a21\u5f0f<\/span><br \/>\nclass MemoryMapper <span class=\"token punctuation\">{<\/span><br \/>\n    public VMAArea <span class=\"token function\">createMemoryMapping<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4f7f\u7528\u5de5\u5382\u521b\u5efaVMA<\/span><br \/>\n        VMAArea vma <span class=\"token operator\">&#061;<\/span> VMAFactoryManager<span class=\"token punctuation\">.<\/span><span class=\"token function\">createVMA<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6267\u884c\u6620\u5c04\u7b56\u7565<\/span><br \/>\n        MappingStrategy strategy <span class=\"token operator\">&#061;<\/span> MappingStrategySelector<span class=\"token punctuation\">.<\/span><span class=\"token function\">selectStrategy<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            request<span class=\"token punctuation\">,<\/span> <span class=\"token function\">getSystemContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6267\u884c\u6620\u5c04<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> result <span class=\"token operator\">&#061;<\/span> strategy<span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">,<\/span> request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>result <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            throw new <span class=\"token function\">MappingException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Failed to map memory: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> vma<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    private SystemContext <span class=\"token function\">getSystemContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> new <span class=\"token function\">SystemContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u83b7\u53d6\u5f53\u524d\u7cfb\u7edf\u4e0a\u4e0b\u6587<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>6.3 \u89c2\u5bdf\u8005\u6a21\u5f0f\u5728\u6620\u5c04\u76d1\u63a7\u4e2d\u7684\u4f53\u73b0<\/h3>\n<p>\u2003\u2003\u6620\u5c04\u76d1\u63a7\u7684\u89c2\u5bdf\u8005\u6a21\u5f0f&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u6620\u5c04\u4e8b\u4ef6\u63a5\u53e3<\/span><br \/>\ninterface MappingEvent <span class=\"token punctuation\">{<\/span><br \/>\n    String <span class=\"token function\">getEventType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">long<\/span> <span class=\"token function\">getTimestamp<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    MemoryRegion <span class=\"token function\">getMappedRegion<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    MappingRequest <span class=\"token function\">getOriginalRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    Map<span class=\"token operator\">&lt;<\/span>String<span class=\"token punctuation\">,<\/span> Object<span class=\"token operator\">&gt;<\/span> <span class=\"token function\">getEventData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    boolean <span class=\"token function\">isSuccess<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6620\u5c04\u5b8c\u6210\u4e8b\u4ef6<\/span><br \/>\nclass MappingCompleteEvent implements MappingEvent <span class=\"token punctuation\">{<\/span><br \/>\n    private final MemoryRegion region<span class=\"token punctuation\">;<\/span><br \/>\n    private final MappingRequest request<span class=\"token punctuation\">;<\/span><br \/>\n    private final boolean success<span class=\"token punctuation\">;<\/span><br \/>\n    private final Map<span class=\"token operator\">&lt;<\/span>String<span class=\"token punctuation\">,<\/span> Object<span class=\"token operator\">&gt;<\/span> eventData<span class=\"token punctuation\">;<\/span><\/p>\n<p>    public <span class=\"token function\">MappingCompleteEvent<\/span><span class=\"token punctuation\">(<\/span>MemoryRegion region<span class=\"token punctuation\">,<\/span> MappingRequest request<span class=\"token punctuation\">,<\/span><br \/>\n                               boolean success<span class=\"token punctuation\">,<\/span> Map<span class=\"token operator\">&lt;<\/span>String<span class=\"token punctuation\">,<\/span> Object<span class=\"token operator\">&gt;<\/span> eventData<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        this<span class=\"token punctuation\">.<\/span>region <span class=\"token operator\">&#061;<\/span> region<span class=\"token punctuation\">;<\/span><br \/>\n        this<span class=\"token punctuation\">.<\/span>request <span class=\"token operator\">&#061;<\/span> request<span class=\"token punctuation\">;<\/span><br \/>\n        this<span class=\"token punctuation\">.<\/span>success <span class=\"token operator\">&#061;<\/span> success<span class=\"token punctuation\">;<\/span><br \/>\n        this<span class=\"token punctuation\">.<\/span>eventData <span class=\"token operator\">&#061;<\/span> eventData <span class=\"token operator\">!&#061;<\/span> null <span class=\"token operator\">?<\/span> eventData <span class=\"token operator\">:<\/span> new HashMap<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public String <span class=\"token function\">getEventType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;MAPPING_COMPLETE&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">long<\/span> <span class=\"token function\">getTimestamp<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> System<span class=\"token punctuation\">.<\/span><span class=\"token function\">nanoTime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public MemoryRegion <span class=\"token function\">getMappedRegion<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> region<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public MappingRequest <span class=\"token function\">getOriginalRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> request<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public Map<span class=\"token operator\">&lt;<\/span>String<span class=\"token punctuation\">,<\/span> Object<span class=\"token operator\">&gt;<\/span> <span class=\"token function\">getEventData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> eventData<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public boolean <span class=\"token function\">isSuccess<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> success<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6620\u5c04\u89c2\u5bdf\u8005\u63a5\u53e3<\/span><br \/>\ninterface MappingObserver <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">onMappingEvent<\/span><span class=\"token punctuation\">(<\/span>MappingEvent event<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    Set<span class=\"token operator\">&lt;<\/span>String<span class=\"token operator\">&gt;<\/span> <span class=\"token function\">getInterestedMappingTypes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    boolean <span class=\"token function\">isEnabled<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6027\u80fd\u76d1\u63a7\u89c2\u5bdf\u8005<\/span><br \/>\nclass MappingPerformanceObserver implements MappingObserver <span class=\"token punctuation\">{<\/span><br \/>\n    private Map<span class=\"token operator\">&lt;<\/span>String<span class=\"token punctuation\">,<\/span> Long<span class=\"token operator\">&gt;<\/span> mappingTimes <span class=\"token operator\">&#061;<\/span> new HashMap<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    private Map<span class=\"token operator\">&lt;<\/span>String<span class=\"token punctuation\">,<\/span> Integer<span class=\"token operator\">&gt;<\/span> mappingCounts <span class=\"token operator\">&#061;<\/span> new HashMap<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    public <span class=\"token keyword\">void<\/span> <span class=\"token function\">onMappingEvent<\/span><span class=\"token punctuation\">(<\/span>MappingEvent event<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        String mappingType <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">determineMappingType<\/span><span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">.<\/span><span class=\"token function\">getOriginalRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;MAPPING_COMPLETE&#034;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">.<\/span><span class=\"token function\">getEventType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u8bb0\u5f55\u6620\u5c04\u65f6\u95f4<\/span><br \/>\n            Long time <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>Long<span class=\"token punctuation\">)<\/span> event<span class=\"token punctuation\">.<\/span><span class=\"token function\">getEventData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;mappingTime&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>time <span class=\"token operator\">!&#061;<\/span> null<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                mappingTimes<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>mappingType<span class=\"token punctuation\">,<\/span><br \/>\n                    mappingTimes<span class=\"token punctuation\">.<\/span><span class=\"token function\">getOrDefault<\/span><span class=\"token punctuation\">(<\/span>mappingType<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0L<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> time<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u8bb0\u5f55\u6620\u5c04\u6b21\u6570<\/span><br \/>\n            mappingCounts<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>mappingType<span class=\"token punctuation\">,<\/span><br \/>\n                mappingCounts<span class=\"token punctuation\">.<\/span><span class=\"token function\">getOrDefault<\/span><span class=\"token punctuation\">(<\/span>mappingType<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public Set<span class=\"token operator\">&lt;<\/span>String<span class=\"token operator\">&gt;<\/span> <span class=\"token function\">getInterestedMappingTypes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> new HashSet<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span>Arrays<span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;ANONYMOUS&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;FILE&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;DEVICE&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;SHARED&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public boolean <span class=\"token function\">isEnabled<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    private String <span class=\"token function\">determineMappingType<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">isAnonymous<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;ANONYMOUS&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasFile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">isShared<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> <span class=\"token string\">&#034;SHARED_FILE&#034;<\/span> <span class=\"token operator\">:<\/span> <span class=\"token string\">&#034;PRIVATE_FILE&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;DEVICE&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">double<\/span> <span class=\"token function\">getAverageMappingTime<\/span><span class=\"token punctuation\">(<\/span>String mappingType<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        Long totalTime <span class=\"token operator\">&#061;<\/span> mappingTimes<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>mappingType<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        Integer count <span class=\"token operator\">&#061;<\/span> mappingCounts<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>mappingType<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>totalTime <span class=\"token operator\">!&#061;<\/span> null <span class=\"token operator\">&amp;&amp;<\/span> count <span class=\"token operator\">!&#061;<\/span> null <span class=\"token operator\">&amp;&amp;<\/span> count <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> totalTime<span class=\"token punctuation\">.<\/span><span class=\"token function\">doubleValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">\/<\/span> count<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">0.0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5185\u5b58\u4f7f\u7528\u89c2\u5bdf\u8005<\/span><br \/>\nclass MemoryUsageObserver implements MappingObserver <span class=\"token punctuation\">{<\/span><br \/>\n    private AtomicLong totalMappedBytes <span class=\"token operator\">&#061;<\/span> new <span class=\"token function\">AtomicLong<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    private Map<span class=\"token operator\">&lt;<\/span>String<span class=\"token punctuation\">,<\/span> AtomicLong<span class=\"token operator\">&gt;<\/span> typeMappedBytes <span class=\"token operator\">&#061;<\/span> new ConcurrentHashMap<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    public <span class=\"token keyword\">void<\/span> <span class=\"token function\">onMappingEvent<\/span><span class=\"token punctuation\">(<\/span>MappingEvent event<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">.<\/span><span class=\"token function\">isSuccess<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">long<\/span> bytes <span class=\"token operator\">&#061;<\/span> event<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMappedRegion<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getSize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            totalMappedBytes<span class=\"token punctuation\">.<\/span><span class=\"token function\">addAndGet<\/span><span class=\"token punctuation\">(<\/span>bytes<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            String mappingType <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">determineMappingType<\/span><span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">.<\/span><span class=\"token function\">getOriginalRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            typeMappedBytes<span class=\"token punctuation\">.<\/span><span class=\"token function\">computeIfAbsent<\/span><span class=\"token punctuation\">(<\/span>mappingType<span class=\"token punctuation\">,<\/span> k <span class=\"token operator\">-&gt;<\/span> new <span class=\"token function\">AtomicLong<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                          <span class=\"token punctuation\">.<\/span><span class=\"token function\">addAndGet<\/span><span class=\"token punctuation\">(<\/span>bytes<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public Set<span class=\"token operator\">&lt;<\/span>String<span class=\"token operator\">&gt;<\/span> <span class=\"token function\">getInterestedMappingTypes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> new HashSet<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span>Arrays<span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;*&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u76d1\u542c\u6240\u6709\u7c7b\u578b<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public boolean <span class=\"token function\">isEnabled<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    private String <span class=\"token function\">determineMappingType<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">isAnonymous<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;ANONYMOUS&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasFile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;FILE&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;DEVICE&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">long<\/span> <span class=\"token function\">getTotalMappedBytes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> totalMappedBytes<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">long<\/span> <span class=\"token function\">getMappedBytesByType<\/span><span class=\"token punctuation\">(<\/span>String type<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        AtomicLong bytes <span class=\"token operator\">&#061;<\/span> typeMappedBytes<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>type<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> bytes <span class=\"token operator\">!&#061;<\/span> null <span class=\"token operator\">?<\/span> bytes<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5b89\u5168\u76d1\u63a7\u89c2\u5bdf\u8005<\/span><br \/>\nclass SecurityMappingObserver implements MappingObserver <span class=\"token punctuation\">{<\/span><br \/>\n    private List<span class=\"token operator\">&lt;<\/span>String<span class=\"token operator\">&gt;<\/span> securityEvents <span class=\"token operator\">&#061;<\/span> Collections<span class=\"token punctuation\">.<\/span><span class=\"token function\">synchronizedList<\/span><span class=\"token punctuation\">(<\/span>new ArrayList<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    public <span class=\"token keyword\">void<\/span> <span class=\"token function\">onMappingEvent<\/span><span class=\"token punctuation\">(<\/span>MappingEvent event<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u68c0\u67e5\u6f5c\u5728\u7684\u5b89\u5168\u95ee\u9898<\/span><br \/>\n        MappingRequest request <span class=\"token operator\">&#061;<\/span> event<span class=\"token punctuation\">.<\/span><span class=\"token function\">getOriginalRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        MemoryRegion region <span class=\"token operator\">&#061;<\/span> event<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMappedRegion<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u68c0\u67e5\u53ef\u6267\u884c\u6743\u9650<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>region<span class=\"token punctuation\">.<\/span><span class=\"token function\">isExecutable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasFile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            File file <span class=\"token operator\">&#061;<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getFile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token function\">isTrustedExecutable<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">logSecurityEvent<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Potentially unsafe executable mapping: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> file<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u68c0\u67e5\u5927\u9875\u6620\u5c04<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>region<span class=\"token punctuation\">.<\/span><span class=\"token function\">isHugePage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> region<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> MAX_SAFE_HUGE_PAGE_SIZE<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">logSecurityEvent<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Large huge page mapping detected: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> region<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u68c0\u67e5\u5171\u4eab\u6620\u5c04\u6743\u9650<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">isShared<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> region<span class=\"token punctuation\">.<\/span><span class=\"token function\">isWritable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">logSecurityEvent<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Shared writable mapping: potential security risk&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public Set<span class=\"token operator\">&lt;<\/span>String<span class=\"token operator\">&gt;<\/span> <span class=\"token function\">getInterestedMappingTypes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> new HashSet<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span>Arrays<span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;*&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public boolean <span class=\"token function\">isEnabled<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    private <span class=\"token keyword\">void<\/span> <span class=\"token function\">logSecurityEvent<\/span><span class=\"token punctuation\">(<\/span>String event<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        securityEvents<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8bb0\u5f55\u5230\u7cfb\u7edf\u65e5\u5fd7<\/span><br \/>\n        System<span class=\"token punctuation\">.<\/span>err<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;SECURITY: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> event<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    private boolean <span class=\"token function\">isTrustedExecutable<\/span><span class=\"token punctuation\">(<\/span>File file<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u68c0\u67e5\u6587\u4ef6\u662f\u5426\u6765\u81ea\u53ef\u4fe1\u6765\u6e90<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> file<span class=\"token punctuation\">.<\/span><span class=\"token function\">isFromTrustedPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> file<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasValidSignature<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public List<span class=\"token operator\">&lt;<\/span>String<span class=\"token operator\">&gt;<\/span> <span class=\"token function\">getSecurityEvents<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> new ArrayList<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span>securityEvents<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6620\u5c04\u76d1\u63a7\u5668<\/span><br \/>\nclass MappingMonitor <span class=\"token punctuation\">{<\/span><br \/>\n    private List<span class=\"token operator\">&lt;<\/span>MappingObserver<span class=\"token operator\">&gt;<\/span> observers <span class=\"token operator\">&#061;<\/span> new CopyOnWriteArrayList<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    private Executor notificationExecutor<span class=\"token punctuation\">;<\/span><\/p>\n<p>    public <span class=\"token function\">MappingMonitor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        this<span class=\"token punctuation\">.<\/span>notificationExecutor <span class=\"token operator\">&#061;<\/span> Executors<span class=\"token punctuation\">.<\/span><span class=\"token function\">newSingleThreadExecutor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">void<\/span> <span class=\"token function\">addObserver<\/span><span class=\"token punctuation\">(<\/span>MappingObserver observer<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        observers<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>observer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">void<\/span> <span class=\"token function\">removeObserver<\/span><span class=\"token punctuation\">(<\/span>MappingObserver observer<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        observers<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span>observer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">void<\/span> <span class=\"token function\">notifyMappingEvent<\/span><span class=\"token punctuation\">(<\/span>MappingEvent event<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        notificationExecutor<span class=\"token punctuation\">.<\/span><span class=\"token function\">submit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>MappingObserver observer <span class=\"token operator\">:<\/span> observers<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>observer<span class=\"token punctuation\">.<\/span><span class=\"token function\">isEnabled<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    Set<span class=\"token operator\">&lt;<\/span>String<span class=\"token operator\">&gt;<\/span> interestedTypes <span class=\"token operator\">&#061;<\/span> observer<span class=\"token punctuation\">.<\/span><span class=\"token function\">getInterestedMappingTypes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    String mappingType <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">determineMappingType<\/span><span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">.<\/span><span class=\"token function\">getOriginalRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>interestedTypes<span class=\"token punctuation\">.<\/span><span class=\"token function\">contains<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;*&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> interestedTypes<span class=\"token punctuation\">.<\/span><span class=\"token function\">contains<\/span><span class=\"token punctuation\">(<\/span>mappingType<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        try <span class=\"token punctuation\">{<\/span><br \/>\n                            observer<span class=\"token punctuation\">.<\/span><span class=\"token function\">onMappingEvent<\/span><span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token punctuation\">}<\/span> <span class=\"token function\">catch<\/span> <span class=\"token punctuation\">(<\/span>Exception e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                            <span class=\"token function\">logObserverError<\/span><span class=\"token punctuation\">(<\/span>observer<span class=\"token punctuation\">,<\/span> event<span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">void<\/span> <span class=\"token function\">startMapping<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u53ef\u4ee5\u5728\u8fd9\u91cc\u6dfb\u52a0\u6620\u5c04\u5f00\u59cb\u4e8b\u4ef6<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">void<\/span> <span class=\"token function\">completeMapping<\/span><span class=\"token punctuation\">(<\/span>MemoryRegion region<span class=\"token punctuation\">,<\/span> MappingRequest request<span class=\"token punctuation\">,<\/span><br \/>\n                               boolean success<span class=\"token punctuation\">,<\/span> Map<span class=\"token operator\">&lt;<\/span>String<span class=\"token punctuation\">,<\/span> Object<span class=\"token operator\">&gt;<\/span> eventData<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        MappingEvent event <span class=\"token operator\">&#061;<\/span> new <span class=\"token function\">MappingCompleteEvent<\/span><span class=\"token punctuation\">(<\/span>region<span class=\"token punctuation\">,<\/span> request<span class=\"token punctuation\">,<\/span> success<span class=\"token punctuation\">,<\/span> eventData<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">notifyMappingEvent<\/span><span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public <span class=\"token keyword\">void<\/span> <span class=\"token function\">shutdown<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        notificationExecutor<span class=\"token punctuation\">.<\/span><span class=\"token function\">shutdown<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        try <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>notificationExecutor<span class=\"token punctuation\">.<\/span><span class=\"token function\">awaitTermination<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> TimeUnit<span class=\"token punctuation\">.<\/span>SECONDS<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                notificationExecutor<span class=\"token punctuation\">.<\/span><span class=\"token function\">shutdownNow<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token function\">catch<\/span> <span class=\"token punctuation\">(<\/span>InterruptedException e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            notificationExecutor<span class=\"token punctuation\">.<\/span><span class=\"token function\">shutdownNow<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    private String <span class=\"token function\">determineMappingType<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">isAnonymous<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;ANONYMOUS&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasFile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;FILE&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;DEVICE&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    private <span class=\"token keyword\">void<\/span> <span class=\"token function\">logObserverError<\/span><span class=\"token punctuation\">(<\/span>MappingObserver observer<span class=\"token punctuation\">,<\/span> MappingEvent event<span class=\"token punctuation\">,<\/span> Exception e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        System<span class=\"token punctuation\">.<\/span>err<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Mapping observer error: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> observer<span class=\"token punctuation\">.<\/span><span class=\"token function\">getClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getSimpleName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n                          <span class=\"token string\">&#034; failed to process event &#034;<\/span> <span class=\"token operator\">&#043;<\/span> event<span class=\"token punctuation\">.<\/span><span class=\"token function\">getEventType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528\u89c2\u5bdf\u8005\u6a21\u5f0f<\/span><br \/>\nclass MemoryMappingSystem <span class=\"token punctuation\">{<\/span><br \/>\n    private MappingMonitor monitor<span class=\"token punctuation\">;<\/span><\/p>\n<p>    public <span class=\"token function\">MemoryMappingSystem<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        this<span class=\"token punctuation\">.<\/span>monitor <span class=\"token operator\">&#061;<\/span> new <span class=\"token function\">MappingMonitor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6ce8\u518c\u89c2\u5bdf\u8005<\/span><br \/>\n        monitor<span class=\"token punctuation\">.<\/span><span class=\"token function\">addObserver<\/span><span class=\"token punctuation\">(<\/span>new <span class=\"token function\">MappingPerformanceObserver<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        monitor<span class=\"token punctuation\">.<\/span><span class=\"token function\">addObserver<\/span><span class=\"token punctuation\">(<\/span>new <span class=\"token function\">MemoryUsageObserver<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        monitor<span class=\"token punctuation\">.<\/span><span class=\"token function\">addObserver<\/span><span class=\"token punctuation\">(<\/span>new <span class=\"token function\">SecurityMappingObserver<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    public MemoryRegion <span class=\"token function\">createMapping<\/span><span class=\"token punctuation\">(<\/span>MappingRequest request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        monitor<span class=\"token punctuation\">.<\/span><span class=\"token function\">startMapping<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">long<\/span> startTime <span class=\"token operator\">&#061;<\/span> System<span class=\"token punctuation\">.<\/span><span class=\"token function\">nanoTime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        try <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u521b\u5efaVMA<\/span><br \/>\n            VMAArea vma <span class=\"token operator\">&#061;<\/span> VMAFactoryManager<span class=\"token punctuation\">.<\/span><span class=\"token function\">createVMA<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u6267\u884c\u6620\u5c04<\/span><br \/>\n            MappingStrategy strategy <span class=\"token operator\">&#061;<\/span> MappingStrategySelector<span class=\"token punctuation\">.<\/span><span class=\"token function\">selectStrategy<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                request<span class=\"token punctuation\">,<\/span> <span class=\"token function\">getSystemContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">int<\/span> result <span class=\"token operator\">&#061;<\/span> strategy<span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">,<\/span> request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">long<\/span> mappingTime <span class=\"token operator\">&#061;<\/span> System<span class=\"token punctuation\">.<\/span><span class=\"token function\">nanoTime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> startTime<span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u901a\u77e5\u6620\u5c04\u5b8c\u6210<\/span><br \/>\n            Map<span class=\"token operator\">&lt;<\/span>String<span class=\"token punctuation\">,<\/span> Object<span class=\"token operator\">&gt;<\/span> eventData <span class=\"token operator\">&#061;<\/span> new HashMap<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            eventData<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;mappingTime&#034;<\/span><span class=\"token punctuation\">,<\/span> mappingTime<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            eventData<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;strategy&#034;<\/span><span class=\"token punctuation\">,<\/span> strategy<span class=\"token punctuation\">.<\/span><span class=\"token function\">getStrategyName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            monitor<span class=\"token punctuation\">.<\/span><span class=\"token function\">completeMapping<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">,<\/span> request<span class=\"token punctuation\">,<\/span> result <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> eventData<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>result <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                throw new <span class=\"token function\">MappingException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Mapping failed: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token keyword\">return<\/span> vma<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token punctuation\">}<\/span> <span class=\"token function\">catch<\/span> <span class=\"token punctuation\">(<\/span>Exception e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u901a\u77e5\u6620\u5c04\u5931\u8d25<\/span><br \/>\n            Map<span class=\"token operator\">&lt;<\/span>String<span class=\"token punctuation\">,<\/span> Object<span class=\"token operator\">&gt;<\/span> errorData <span class=\"token operator\">&#061;<\/span> new HashMap<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            errorData<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;error&#034;<\/span><span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            errorData<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;mappingTime&#034;<\/span><span class=\"token punctuation\">,<\/span> System<span class=\"token punctuation\">.<\/span><span class=\"token function\">nanoTime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> startTime<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            monitor<span class=\"token punctuation\">.<\/span><span class=\"token function\">completeMapping<\/span><span class=\"token punctuation\">(<\/span>null<span class=\"token punctuation\">,<\/span> request<span class=\"token punctuation\">,<\/span> false<span class=\"token punctuation\">,<\/span> errorData<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            throw e<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    private SystemContext <span class=\"token function\">getSystemContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> new <span class=\"token function\">SystemContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u83b7\u53d6\u5f53\u524d\u7cfb\u7edf\u4e0a\u4e0b\u6587<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h2>7. \u72b6\u6001\u673a\u5206\u6790<\/h2>\n<p>\u2003\u2003ARM64 mm mmap\u7684\u72b6\u6001\u673a&#xff1a;<\/p>\n<p>\u521d\u59cb\u72b6\u6001 -&gt; \u8bf7\u6c42\u9a8c\u8bc1 -&gt; \u5730\u5740\u5206\u914d -&gt; VMA\u521b\u5efa -&gt; \u6620\u5c04\u7b56\u7565\u9009\u62e9 -&gt; \u6743\u9650\u8bbe\u7f6e -&gt; \u9875\u8868\u5efa\u7acb -&gt; TLB\u66f4\u65b0 -&gt; \u6620\u5c04\u5b8c\u6210<br \/>\n     \u2191                                                                                                           \u2193<br \/>\n\u53c2\u6570\u68c0\u67e5 &lt;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<br \/>\n     \u2191                                                                                                           \u2193<br \/>\n\u5b89\u5168\u9a8c\u8bc1 &lt;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<br \/>\n     \u2191                                                                                                           \u2193<br \/>\n\u8d44\u6e90\u5206\u914d &lt;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;<\/p>\n<h2>8. \u6027\u80fd\u4f18\u5316\u5206\u6790<\/h2>\n<h3>8.1 \u5730\u5740\u5206\u914d\u4f18\u5316<\/h3>\n<p>\u2003\u2003\u5730\u5740\u5206\u914d\u7684\u6027\u80fd\u4f18\u5316&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u5730\u5740\u5206\u914d\u7f13\u5b58\u4f18\u5316<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">cached_unmapped_area<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">rb_root<\/span> <span class=\"token operator\">*<\/span>root<span class=\"token punctuation\">,<\/span><br \/>\n                                        <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> len<span class=\"token punctuation\">,<\/span><br \/>\n                                        <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> pgoff<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm <span class=\"token operator\">&#061;<\/span> current<span class=\"token operator\">-&gt;<\/span>mm<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u7f13\u5b58\u662f\u5426\u6709\u6548<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>mm<span class=\"token operator\">-&gt;<\/span>free_area_cache <span class=\"token operator\">&amp;&amp;<\/span> mm<span class=\"token operator\">-&gt;<\/span>free_area_cache <span class=\"token operator\">&lt;&#061;<\/span> addr <span class=\"token operator\">&#043;<\/span> len<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> cached_addr <span class=\"token operator\">&#061;<\/span> mm<span class=\"token operator\">-&gt;<\/span>free_area_cache<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u9a8c\u8bc1\u7f13\u5b58\u7684\u5730\u5740\u662f\u5426\u4ecd\u7136\u53ef\u7528<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">is_area_available<\/span><span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">,<\/span> cached_addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            mm<span class=\"token operator\">-&gt;<\/span>free_area_cache <span class=\"token operator\">&#061;<\/span> cached_addr <span class=\"token operator\">&#043;<\/span> len<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> cached_addr<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7f13\u5b58\u65e0\u6548&#xff0c;\u6267\u884c\u6b63\u5e38\u5206\u914d<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> new_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">unmapped_area<\/span><span class=\"token punctuation\">(<\/span>root<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> pgoff<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u66f4\u65b0\u7f13\u5b58<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_FIXED<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        mm<span class=\"token operator\">-&gt;<\/span>free_area_cache <span class=\"token operator\">&#061;<\/span> new_addr <span class=\"token operator\">&#043;<\/span> len<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> new_addr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ VMA\u67e5\u627e\u4f18\u5316<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">find_vma_prev<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span><br \/>\n                                    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>pprev<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>vma <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span>prev <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u4f7f\u7528\u7ea2\u9ed1\u6811\u8fdb\u884c\u5feb\u901f\u67e5\u627e<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">rb_node<\/span> <span class=\"token operator\">*<\/span>rb_node <span class=\"token operator\">&#061;<\/span> mm<span class=\"token operator\">-&gt;<\/span>mm_rb<span class=\"token punctuation\">.<\/span>rb_node<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>rb_node<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>tmp <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">rb_entry<\/span><span class=\"token punctuation\">(<\/span>rb_node<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span><span class=\"token punctuation\">,<\/span> vm_rb<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tmp<span class=\"token operator\">-&gt;<\/span>vm_end <span class=\"token operator\">&gt;<\/span> addr<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            rb_node <span class=\"token operator\">&#061;<\/span> rb_node<span class=\"token operator\">-&gt;<\/span>rb_left<span class=\"token punctuation\">;<\/span><br \/>\n            vma <span class=\"token operator\">&#061;<\/span> tmp<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>pprev<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token operator\">*<\/span>pprev <span class=\"token operator\">&#061;<\/span> prev<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            rb_node <span class=\"token operator\">&#061;<\/span> rb_node<span class=\"token operator\">-&gt;<\/span>rb_right<span class=\"token punctuation\">;<\/span><br \/>\n            prev <span class=\"token operator\">&#061;<\/span> tmp<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u66f4\u65b0\u67e5\u627e\u7f13\u5b58<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">)<\/span><br \/>\n        mm<span class=\"token operator\">-&gt;<\/span>mmap_cache <span class=\"token operator\">&#061;<\/span> vma<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>pprev<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">*<\/span>pprev <span class=\"token operator\">&#061;<\/span> prev<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> vma<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>8.2 \u6620\u5c04\u9884\u70ed\u4f18\u5316<\/h3>\n<p>\u2003\u2003\u6620\u5c04\u9884\u70ed\u7684\u6027\u80fd\u4f18\u5316&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u6620\u5c04\u9884\u70ed\u4f18\u5316<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">mmap_prefault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>vma<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> start<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> len<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr <span class=\"token operator\">&#061;<\/span> start<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> end <span class=\"token operator\">&#061;<\/span> start <span class=\"token operator\">&#043;<\/span> len<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5bf9\u4e8e\u79c1\u6709\u6620\u5c04&#xff0c;\u9884\u5148\u5206\u914d\u9875\u9762<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token operator\">-&gt;<\/span>vm_flags <span class=\"token operator\">&amp;<\/span> VM_SHARED<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">;<\/span> addr <span class=\"token operator\">&lt;<\/span> end<span class=\"token punctuation\">;<\/span> addr <span class=\"token operator\">&#043;&#061;<\/span> PAGE_SIZE<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u9884\u5148\u89e6\u53d1\u9875\u9762\u9519\u8bef<\/span><br \/>\n            <span class=\"token function\">handle_mm_fault<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> FAULT_FLAG_WRITE<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6279\u91cf\u6620\u5c04\u4f18\u5316<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">mmap_batch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span>file<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span><br \/>\n              <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> prot<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">,<\/span><br \/>\n              <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> pgoff<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> batch_size<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> current_addr <span class=\"token operator\">&#061;<\/span> addr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> end_addr <span class=\"token operator\">&#061;<\/span> addr <span class=\"token operator\">&#043;<\/span> len<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> total_mapped <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6279\u91cf\u5904\u7406\u6620\u5c04\u8bf7\u6c42<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>current_addr <span class=\"token operator\">&lt;<\/span> end_addr<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> batch_len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">)<\/span>batch_size <span class=\"token operator\">*<\/span> PAGE_SIZE<span class=\"token punctuation\">,<\/span><br \/>\n                                    end_addr <span class=\"token operator\">&#8211;<\/span> current_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6267\u884c\u6279\u6b21\u6620\u5c04<\/span><br \/>\n        <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> mapped_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">do_mmap_pgoff<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">,<\/span> current_addr<span class=\"token punctuation\">,<\/span> batch_len<span class=\"token punctuation\">,<\/span><br \/>\n                                                prot<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">,<\/span> pgoff<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">IS_ERR_VALUE<\/span><span class=\"token punctuation\">(<\/span>mapped_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        current_addr <span class=\"token operator\">&#043;&#061;<\/span> batch_len<span class=\"token punctuation\">;<\/span><br \/>\n        pgoff <span class=\"token operator\">&#043;&#061;<\/span> batch_len <span class=\"token operator\">&gt;&gt;<\/span> PAGE_SHIFT<span class=\"token punctuation\">;<\/span><br \/>\n        total_mapped <span class=\"token operator\">&#043;&#061;<\/span> batch_len<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> total_mapped<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h2>9. \u5b89\u5168\u6027\u8003\u8651<\/h2>\n<h3>9.1 \u6620\u5c04\u6743\u9650\u5b89\u5168\u9a8c\u8bc1<\/h3>\n<p>\u2003\u2003\u6620\u5c04\u6743\u9650\u7684\u5b89\u5168\u9a8c\u8bc1&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u6620\u5c04\u6743\u9650\u5b89\u5168\u68c0\u67e5<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">validate_mapping_permissions<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span>file<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> prot<span class=\"token punctuation\">,<\/span><br \/>\n                               <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">cred<\/span> <span class=\"token operator\">*<\/span>cred<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u68c0\u67e5\u6587\u4ef6\u8bbf\u95ee\u6743\u9650<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> access <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>prot <span class=\"token operator\">&amp;<\/span> PROT_READ<span class=\"token punctuation\">)<\/span><br \/>\n            access <span class=\"token operator\">|&#061;<\/span> MAY_READ<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>prot <span class=\"token operator\">&amp;<\/span> PROT_WRITE<span class=\"token punctuation\">)<\/span><br \/>\n            access <span class=\"token operator\">|&#061;<\/span> MAY_WRITE<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>prot <span class=\"token operator\">&amp;<\/span> PROT_EXEC<span class=\"token punctuation\">)<\/span><br \/>\n            access <span class=\"token operator\">|&#061;<\/span> MAY_EXEC<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6267\u884c\u6587\u4ef6\u6743\u9650\u68c0\u67e5<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">file_permission<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">,<\/span> access<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EACCES<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u68c0\u67e5\u6587\u4ef6\u662f\u5426\u5141\u8bb8mmap<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>file<span class=\"token operator\">-&gt;<\/span>f_op<span class=\"token operator\">-&gt;<\/span>mmap<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>ENODEV<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u6620\u5c04\u7c7b\u578b\u5b89\u5168<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_SHARED<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token punctuation\">(<\/span>prot <span class=\"token operator\">&amp;<\/span> PROT_WRITE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5171\u4eab\u53ef\u5199\u6620\u5c04\u9700\u8981\u989d\u5916\u68c0\u67e5<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>file <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">!<\/span><span class=\"token function\">may_share_write_access<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">,<\/span> cred<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EACCES<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u53ef\u6267\u884c\u6620\u5c04\u7684\u5b89\u5168\u6027<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>prot <span class=\"token operator\">&amp;<\/span> PROT_EXEC<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token function\">may_map_executable<\/span><span class=\"token punctuation\">(<\/span>cred<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EACCES<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5171\u4eab\u5199\u8bbf\u95ee\u6743\u9650\u68c0\u67e5<\/span><br \/>\n<span class=\"token keyword\">static<\/span> bool <span class=\"token function\">may_share_write_access<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span>file<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">cred<\/span> <span class=\"token operator\">*<\/span>cred<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u68c0\u67e5\u6587\u4ef6\u7cfb\u7edf\u662f\u5426\u5141\u8bb8\u5171\u4eab\u5199\u8bbf\u95ee<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>file<span class=\"token operator\">-&gt;<\/span>f_path<span class=\"token punctuation\">.<\/span>mnt<span class=\"token operator\">-&gt;<\/span>mnt_flags <span class=\"token operator\">&amp;<\/span> MNT_NOATIME<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> false<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u6587\u4ef6\u6743\u9650<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token operator\">-&gt;<\/span>f_mode <span class=\"token operator\">&amp;<\/span> FMODE_WRITE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> false<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u51ed\u636e<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token function\">uid_eq<\/span><span class=\"token punctuation\">(<\/span>cred<span class=\"token operator\">-&gt;<\/span>fsuid<span class=\"token punctuation\">,<\/span> file<span class=\"token operator\">-&gt;<\/span>f_inode<span class=\"token operator\">-&gt;<\/span>i_uid<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span><br \/>\n        <span class=\"token operator\">!<\/span><span class=\"token function\">capable<\/span><span class=\"token punctuation\">(<\/span>CAP_FOWNER<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> false<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u53ef\u6267\u884c\u6620\u5c04\u6743\u9650\u68c0\u67e5<\/span><br \/>\n<span class=\"token keyword\">static<\/span> bool <span class=\"token function\">may_map_executable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">cred<\/span> <span class=\"token operator\">*<\/span>cred<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u68c0\u67e5\u662f\u5426\u5141\u8bb8\u6620\u5c04\u53ef\u6267\u884c\u6587\u4ef6<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cred<span class=\"token operator\">-&gt;<\/span>noexec<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> false<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u5b89\u5168\u7b56\u7565<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">security_mmap_executable<\/span><span class=\"token punctuation\">(<\/span>cred<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>9.2 \u5730\u5740\u7a7a\u95f4\u9694\u79bb\u4fdd\u62a4<\/h3>\n<p>\u2003\u2003\u5730\u5740\u7a7a\u95f4\u9694\u79bb\u7684\u5b89\u5168\u4fdd\u62a4&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u5730\u5740\u7a7a\u95f4\u9694\u79bb\u9a8c\u8bc1<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">validate_address_space_isolation<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span><br \/>\n                                   <span class=\"token class-name\">size_t<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u68c0\u67e5\u5730\u5740\u8303\u56f4\u662f\u5426\u8de8\u8d8a\u5b89\u5168\u8fb9\u754c<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">crosses_address_space_boundary<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EFAULT<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u662f\u5426\u4e0e\u73b0\u6709\u6620\u5c04\u51b2\u7a81<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">conflicts_with_existing_mappings<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EEXIST<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u662f\u5426\u4e3a\u53d7\u4fdd\u62a4\u7684\u5730\u5740\u8303\u56f4<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">is_protected_address_range<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u9700\u8981\u7279\u6743\u8bbf\u95ee<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token function\">capable<\/span><span class=\"token punctuation\">(<\/span>CAP_SYS_ADMIN<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_FIXED<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EACCES<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u9a8c\u8bc1\u5730\u5740\u7a7a\u95f4\u5e03\u5c40\u968f\u673a\u5316<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token function\">validate_aslr_compliance<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EACCES<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5730\u5740\u7a7a\u95f4\u8fb9\u754c\u68c0\u67e5<\/span><br \/>\n<span class=\"token keyword\">static<\/span> bool <span class=\"token function\">crosses_address_space_boundary<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> len<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> end <span class=\"token operator\">&#061;<\/span> addr <span class=\"token operator\">&#043;<\/span> len<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u662f\u5426\u8de8\u8d8a\u7528\u6237\/\u5185\u6838\u8fb9\u754c<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>addr <span class=\"token operator\">&lt;<\/span> TASK_SIZE <span class=\"token operator\">&amp;&amp;<\/span> end <span class=\"token operator\">&gt;<\/span> TASK_SIZE<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span><br \/>\n        <span class=\"token punctuation\">(<\/span>addr <span class=\"token operator\">&lt;<\/span> VMALLOC_START <span class=\"token operator\">&amp;&amp;<\/span> end <span class=\"token operator\">&gt;<\/span> VMALLOC_START<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u662f\u5426\u8de8\u8d8a\u6a21\u5757\u533a\u57df<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>addr <span class=\"token operator\">&lt;<\/span> MODULES_VADDR <span class=\"token operator\">&amp;&amp;<\/span> end <span class=\"token operator\">&gt;<\/span> MODULES_VADDR<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> false<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u73b0\u6709\u6620\u5c04\u51b2\u7a81\u68c0\u67e5<\/span><br \/>\n<span class=\"token keyword\">static<\/span> bool <span class=\"token function\">conflicts_with_existing_mappings<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm<span class=\"token punctuation\">,<\/span><br \/>\n                                           <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> len<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>vma<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> end <span class=\"token operator\">&#061;<\/span> addr <span class=\"token operator\">&#043;<\/span> len<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u67e5\u627e\u53ef\u80fd\u51b2\u7a81\u7684VMA<\/span><br \/>\n    vma <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">find_vma<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>vma <span class=\"token operator\">&amp;&amp;<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_start <span class=\"token operator\">&lt;<\/span> end<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token operator\">-&gt;<\/span>vm_flags <span class=\"token operator\">&amp;<\/span> VM_GAP<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span><br \/>\n            <span class=\"token function\">overlaps_with_vma<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> end<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        vma <span class=\"token operator\">&#061;<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_next<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> false<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ ASLR\u5408\u89c4\u6027\u9a8c\u8bc1<\/span><br \/>\n<span class=\"token keyword\">static<\/span> bool <span class=\"token function\">validate_aslr_compliance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span><br \/>\n                                   <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5bf9\u4e8e\u56fa\u5b9a\u6620\u5c04&#xff0c;ASLR\u4e0d\u9002\u7528<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> MAP_FIXED<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u5730\u5740\u662f\u5426\u7b26\u5408ASLR\u968f\u673a\u5316\u8981\u6c42<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>mm<span class=\"token operator\">-&gt;<\/span>aslr_enabled<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> expected_base <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">get_randomized_base<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>addr <span class=\"token operator\">&lt;<\/span> expected_base <span class=\"token operator\">||<\/span> addr <span class=\"token operator\">&gt;<\/span> expected_base <span class=\"token operator\">&#043;<\/span> ASLR_RANGE<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> false<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> true<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h2>10. \u6269\u5c55\u6027\u5206\u6790<\/h2>\n<h3>10.1 \u591a\u67b6\u6784\u652f\u6301<\/h3>\n<p>\u2003\u2003\u8de8\u67b6\u6784\u7684mmap\u6269\u5c55&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u67b6\u6784\u7279\u5b9a\u7684mmap\u64cd\u4f5c\u63a5\u53e3<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">arch_mmap_ops<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>arch_name<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5730\u5740\u5206\u914d<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>get_unmapped_area<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">file<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                                     <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u9875\u8868\u64cd\u4f5c<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>remap_pfn_range<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                          <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">pgprot_t<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6743\u9650\u5904\u7406<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>calc_vm_prot_bits<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>calc_vm_flag_bits<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ ARM64 mmap\u64cd\u4f5c\u5b9e\u73b0<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">arch_mmap_ops<\/span> arm64_mmap_ops <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token punctuation\">.<\/span>arch_name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;arm64&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">.<\/span>get_unmapped_area <span class=\"token operator\">&#061;<\/span> arm64_get_unmapped_area<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">.<\/span>remap_pfn_range <span class=\"token operator\">&#061;<\/span> arm64_remap_pfn_range<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">.<\/span>calc_vm_prot_bits <span class=\"token operator\">&#061;<\/span> arm64_calc_vm_prot_bits<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">.<\/span>calc_vm_flag_bits <span class=\"token operator\">&#061;<\/span> arm64_calc_vm_flag_bits<span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8fd0\u884c\u65f6\u67b6\u6784\u9009\u62e9<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">arch_mmap_ops<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">select_arch_mmap_ops<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">ifdef<\/span> <span class=\"token expression\">CONFIG_ARM64<\/span><\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&amp;<\/span>arm64_mmap_ops<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">else<\/span><\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">endif<\/span><\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>10.2 \u529f\u80fd\u6269\u5c55<\/h3>\n<p>\u2003\u2003mmap\u529f\u80fd\u6269\u5c55\u80fd\u529b&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u9ad8\u7ea7mmap\u529f\u80fd\u6269\u5c55<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">advanced_mmap_features<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    bool support_huge_pages<span class=\"token punctuation\">;<\/span>         <span class=\"token comment\">\/\/ \u652f\u6301\u5927\u9875\u6620\u5c04<\/span><br \/>\n    bool support_transparent_huge<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u652f\u6301\u900f\u660e\u5927\u9875<\/span><br \/>\n    bool support_memory_dedup<span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u652f\u6301\u5185\u5b58\u53bb\u91cd<\/span><br \/>\n    bool support_userfaultfd<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u652f\u6301\u7528\u6237\u9875\u9762\u9519\u8bef\u5904\u7406<\/span><br \/>\n    bool support_mremap<span class=\"token punctuation\">;<\/span>             <span class=\"token comment\">\/\/ \u652f\u6301\u6620\u5c04\u91cd\u5b9a\u4f4d<\/span><br \/>\n    bool support_madvise<span class=\"token punctuation\">;<\/span>            <span class=\"token comment\">\/\/ \u652f\u6301\u5185\u5b58\u5efa\u8bae<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ mmap\u6269\u5c55API<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">extended_mmap_api<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5927\u9875\u6620\u5c04<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>mmap_huge<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> prot<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> flags<span class=\"token punctuation\">,<\/span><br \/>\n                    <span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">off_t<\/span> offset<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> hugepage_size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u900f\u660e\u5927\u9875<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>enable_thp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>disable_thp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5185\u5b58\u53bb\u91cd<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>enable_ksm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> start<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> end<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>disable_ksm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> start<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> end<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7528\u6237\u9875\u9762\u9519\u8bef<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>setup_userfaultfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>vma<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>handle_userfault<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">userfaultfd_ctx<\/span> <span class=\"token operator\">*<\/span>ctx<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6620\u5c04\u91cd\u5b9a\u4f4d<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>mremap<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> old_addr<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> old_len<span class=\"token punctuation\">,<\/span><br \/>\n                           <span class=\"token class-name\">size_t<\/span> new_len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> flags<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> new_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5185\u5b58\u5efa\u8bae<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>madvise<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> start<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> advice<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>process_madvise<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> pidfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> start<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> advice<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h2>11. \u8c03\u8bd5\u548c\u7ef4\u62a4<\/h2>\n<h3>11.1 mmap\u8c03\u8bd5\u652f\u6301<\/h3>\n<p>\u2003\u2003mmap\u8c03\u8bd5\u652f\u6301&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ mmap\u8c03\u8bd5\u5b8f<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">MMAP_DEBUG<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>fmt<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token function\">pr_debug<\/span><span class=\"token punctuation\">(<\/span><\/span><span class=\"token string\">&#034;MMAP: &#034;<\/span> <span class=\"token expression\">fmt<span class=\"token punctuation\">,<\/span> <\/span><span class=\"token punctuation\">##<\/span><span class=\"token expression\">__VA_ARGS__<span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">MMAP_DEBUG_MAP<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">,<\/span> prot<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">)<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><\/span><span class=\"token string\">&#034;mapping %lx-%lx prot&#061;%x flags&#061;%x\\\\n&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> addr <span class=\"token operator\">&#043;<\/span> len<span class=\"token punctuation\">,<\/span> prot<span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">MMAP_DEBUG_VMA<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">)<\/span> <\/span><span class=\"token punctuation\">\\\\<\/span><br \/>\n    <span class=\"token expression\"><span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><\/span><span class=\"token string\">&#034;VMA %p [%lx-%lx] flags&#061;%lx\\\\n&#034;<\/span><span class=\"token expression\"><span class=\"token punctuation\">,<\/span> vma<span class=\"token punctuation\">,<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_start<span class=\"token punctuation\">,<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_end<span class=\"token punctuation\">,<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_flags<span class=\"token punctuation\">)<\/span><\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8be6\u7ec6\u8c03\u8bd5\u6a21\u5f0f<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">ifdef<\/span> <span class=\"token expression\">CONFIG_MMAP_DEBUG<\/span><\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">mmap_debug_mapping<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>vma<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span><br \/>\n                              <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> prot<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> flags<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#061;&#061;&#061; MMAP DEBUG &#061;&#061;&#061;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Address: %lx&#034;<\/span><span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Length: %lx&#034;<\/span><span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Protection: %x&#034;<\/span><span class=\"token punctuation\">,<\/span> prot<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Flags: %x&#034;<\/span><span class=\"token punctuation\">,<\/span> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;VMA created: %p&#034;<\/span><span class=\"token punctuation\">,<\/span> vma<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;VMA range: %lx-%lx&#034;<\/span><span class=\"token punctuation\">,<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_start<span class=\"token punctuation\">,<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_end<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;VMA flags: %lx&#034;<\/span><span class=\"token punctuation\">,<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;VMA file: %p&#034;<\/span><span class=\"token punctuation\">,<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_file<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Failed to create VMA&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#061;&#061;&#061; END MMAP DEBUG &#061;&#061;&#061;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">endif<\/span><\/span><\/p>\n<h3>11.2 \u9519\u8bef\u68c0\u6d4b\u548c\u6062\u590d<\/h3>\n<p>\u2003\u2003mmap\u9519\u8bef\u5904\u7406&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ mmap\u9519\u8bef\u68c0\u6d4b<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">detect_mmap_errors<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">vm_area_struct<\/span> <span class=\"token operator\">*<\/span>vma<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span><br \/>\n                             <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> result<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u68c0\u67e5\u6620\u5c04\u7ed3\u679c<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">IS_ERR_VALUE<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;mmap failed: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u9a8c\u8bc1VMA\u72b6\u6001<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>vma <span class=\"token operator\">||<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_start <span class=\"token operator\">!&#061;<\/span> addr <span class=\"token operator\">||<\/span> vma<span class=\"token operator\">-&gt;<\/span>vm_end <span class=\"token operator\">!&#061;<\/span> addr <span class=\"token operator\">&#043;<\/span> len<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;VMA validation failed\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EFAULT<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u68c0\u67e5\u9875\u8868\u4e00\u81f4\u6027<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token function\">validate_page_tables<\/span><span class=\"token punctuation\">(<\/span>vma<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Page table validation failed\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EFAULT<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u9519\u8bef\u6062\u590d\u673a\u5236<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">recover_mmap_error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> addr<span class=\"token punctuation\">,<\/span><br \/>\n                             <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> len<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> error<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Attempting mmap error recovery: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token operator\">&#8211;<\/span>ENOMEM<span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5185\u5b58\u4e0d\u8db3&#xff1a;\u5c1d\u8bd5\u91ca\u653e\u7f13\u5b58<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">try_reclaim_memory<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">case<\/span> <span class=\"token operator\">&#8211;<\/span>EEXIST<span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5730\u5740\u51b2\u7a81&#xff1a;\u5c1d\u8bd5\u91cd\u65b0\u5206\u914d\u5730\u5740<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">try_relocate_mapping<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Unrecoverable mmap error\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> error<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5185\u5b58\u56de\u6536\u5c1d\u8bd5<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">try_reclaim_memory<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mm_struct<\/span> <span class=\"token operator\">*<\/span>mm<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5c1d\u8bd5\u56de\u6536\u9875\u9762\u7f13\u5b58<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">shrink_page_cache<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Page cache reclaimed successfully\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5c1d\u8bd5\u56de\u6536slab\u7f13\u5b58<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">shrink_slab_cache<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">MMAP_DEBUG<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Slab cache reclaimed successfully\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>ENOMEM<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h2>12. \u603b\u7ed3<\/h2>\n<p>\u2003\u2003ARM64 mm mmap\u5b50\u6a21\u5757\u4f5c\u4e3aARM64\u5185\u5b58\u7ba1\u7406\u5b50\u7cfb\u7edf\u4e2d\u5185\u5b58\u6620\u5c04\u7ba1\u7406\u7684\u6838\u5fc3\u7ec4\u4ef6&#xff0c;\u901a\u8fc7\u5b8c\u6574\u7684\u5730\u5740\u7a7a\u95f4\u7ba1\u7406\u3001\u865a\u62df\u5185\u5b58\u6620\u5c04\u5efa\u7acb\u548c\u6743\u9650\u63a7\u5236\u673a\u5236&#xff0c;\u4e3aARM64\u5e73\u53f0\u63d0\u4f9b\u4e86\u9ad8\u6548\u53ef\u9760\u7684\u5185\u5b58\u8bbf\u95ee\u63a5\u53e3\u3002\u8be5\u6a21\u5757\u5b9e\u73b0\u4e86\u533f\u540d\u6620\u5c04\u3001\u6587\u4ef6\u6620\u5c04\u3001\u5171\u4eab\u6620\u5c04\u7b49\u591a\u79cd\u6620\u5c04\u7c7b\u578b&#xff0c;\u652f\u6301\u5927\u9875\u6620\u5c04\u548c\u900f\u660e\u5927\u9875\u7b49\u9ad8\u7ea7\u7279\u6027&#xff0c;\u5728\u4fdd\u8bc1\u5185\u5b58\u5b89\u5168\u6027\u7684\u540c\u65f6\u5b9e\u73b0\u4e86\u63a5\u8fd1\u786c\u4ef6\u6781\u9650\u7684\u6620\u5c04\u6027\u80fd\u3002\u6e90\u7801\u5206\u6790\u663e\u793a&#xff0c;\u6a21\u5757\u91c7\u7528\u4e86\u7b56\u7565\u6a21\u5f0f\u3001\u5de5\u5382\u6a21\u5f0f\u548c\u89c2\u5bdf\u8005\u6a21\u5f0f\u7b49\u591a\u79cd\u8bbe\u8ba1\u6a21\u5f0f&#xff0c;\u4e3a\u5185\u5b58\u6620\u5c04\u7ba1\u7406\u63d0\u4f9b\u4e86\u7075\u6d3b\u9ad8\u6548\u7684\u5b9e\u73b0\u6846\u67b6\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u76ee\u5f551. \u6982\u8ff02. \u8f6f\u4ef6\u67b6\u6784\u56fe3. \u8c03\u7528\u6d41\u7a0b\u56fe4. 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