{"id":64280,"date":"2026-01-23T07:24:34","date_gmt":"2026-01-22T23:24:34","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/64280.html"},"modified":"2026-01-23T07:24:34","modified_gmt":"2026-01-22T23:24:34","slug":"%e7%ac%ac11%e7%ab%a0-%e6%80%a7%e8%83%bd%e5%88%86%e6%9e%90%e4%b8%8e%e8%b0%83%e4%bc%98","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/64280.html","title":{"rendered":"\u7b2c11\u7ae0: \u6027\u80fd\u5206\u6790\u4e0e\u8c03\u4f18"},"content":{"rendered":"<h3>11.1 \u5178\u578b\u6027\u80fd\u95ee\u9898<\/h3>\n<h4>11.1.1 \u91cd\u8bd5\u98ce\u66b4&#xff08;Retry Storm&#xff09;<\/h4>\n<p>\u95ee\u9898\u73b0\u8c61:<\/p>\n<p><span class=\"token comment\">\/\/ drivers\/gpu\/drm\/amd\/amdgpu\/amdgpu_hmm.c<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">amdgpu_hmm_range_get_pages<\/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 punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> timeout <span class=\"token operator\">&#061;<\/span> jiffies <span class=\"token operator\">&#043;<\/span> <span class=\"token function\">msecs_to_jiffies<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>retry<span class=\"token operator\">:<\/span><br \/>\nhmm_range<span class=\"token operator\">-&gt;<\/span>notifier_seq <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">mmu_interval_read_begin<\/span><span class=\"token punctuation\">(<\/span>notifier<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">hmm_range_fault<\/span><span class=\"token punctuation\">(<\/span>hmm_range<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>r <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span>EBUSY <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">!<\/span><span class=\"token function\">time_after<\/span><span class=\"token punctuation\">(<\/span>jiffies<span class=\"token punctuation\">,<\/span> timeout<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">goto<\/span> retry<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u9891\u7e41\u91cd\u8bd5\u76f4\u5230\u8d85\u65f6<\/span><\/p>\n<p><span class=\"token keyword\">return<\/span> r <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span>EBUSY <span class=\"token operator\">?<\/span> <span class=\"token operator\">&#8211;<\/span>EAGAIN <span class=\"token operator\">:<\/span> r<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5178\u578b\u573a\u666f:<\/p>\n<p>\u5e94\u7528\u7a0b\u5e8f\u884c\u4e3a                  \u5185\u6838\u884c\u4e3a                    \u7ed3\u679c<br \/>\n\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<br \/>\nGPU\u9891\u7e41\u8bbf\u95ee\u5927\u5185\u5b58\u533a\u57df    -&gt;   \u6301\u7eed\u89e6\u53d1page fault    -&gt;   \u5927\u91cfhmm_range_fault<br \/>\n\u540c\u65f6\u4e3b\u673a\u5185\u5b58\u538b\u529b\u5927       -&gt;   kswapd\u9891\u7e41\u56de\u6536\u9875\u9762     -&gt;   \u5927\u91cfinvalidate<br \/>\n                                       \u2193<br \/>\n                        hmm_range_fault\u4e0einvalidate\u6301\u7eed\u51b2\u7a81<br \/>\n                                       \u2193<br \/>\n                                \u91cd\u8bd5\u7387 &gt; 80%&#xff0c;\u5ef6\u8fdf &gt; 500ms<\/p>\n<p>\u6839\u672c\u539f\u56e0:<\/p>\n<p><span class=\"token comment\">\/\/ mm\/hmm.c<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">hmm_range_fault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">hmm_range<\/span> <span class=\"token operator\">*<\/span>range<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/* \u95ee\u98981: \u5927\u8303\u56f4\u904d\u5386\u8017\u65f6\u957f&#xff08;10-100ms&#xff09; *\/<\/span><br \/>\nret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">walk_page_range<\/span><span class=\"token punctuation\">(<\/span>mm<span class=\"token punctuation\">,<\/span> start<span class=\"token punctuation\">,<\/span> end<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>hmm_walk_ops<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>hmm_vma_walk<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* \u95ee\u98982: \u904d\u5386\u671f\u95f4\u4efb\u4f55invalidate\u90fd\u4f1a\u5bfc\u81f4-EBUSY *\/<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">mmu_interval_check_retry<\/span><span class=\"token punctuation\">(<\/span>range<span class=\"token operator\">-&gt;<\/span>notifier<span class=\"token punctuation\">,<\/span> range<span class=\"token operator\">-&gt;<\/span>notifier_seq<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EBUSY<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u524d\u529f\u5c3d\u5f03&#xff0c;\u4ece\u5934\u91cd\u8bd5<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6027\u80fd\u5f71\u54cd:<\/p>\n<ul>\n<li>GPU\u5229\u7528\u7387\u4e0b\u964d 50-90%<\/li>\n<li>\u5e94\u7528\u541e\u5410\u91cf\u4e0b\u964d 10x-100x<\/li>\n<li>CPU\u5f00\u9500\u589e\u52a0&#xff08;\u65e0\u6548\u7684\u9875\u8868\u904d\u5386&#xff09;<\/li>\n<\/ul>\n<hr \/>\n<h4>11.1.2 \u9501\u7ade\u4e89&#xff08;Lock Contention&#xff09;<\/h4>\n<p>\u95ee\u9898\u73b0\u8c61:<\/p>\n<p><span class=\"token comment\"># perf\u8bb0\u5f55\u9501\u7ade\u4e89<\/span><br \/>\n$ perf record -e lock:contention_begin -ag &#8212; <span class=\"token function\">sleep<\/span> <span class=\"token number\">10<\/span><br \/>\n$ perf report<\/p>\n<p><span class=\"token comment\"># \u5178\u578b\u8f93\u51fa<\/span><br \/>\n  <span class=\"token number\">98.5<\/span>%  <span class=\"token punctuation\">[<\/span>kernel<span class=\"token punctuation\">]<\/span>  kvm_mmu_notifier_invalidate_range_start<br \/>\n         <span class=\"token operator\">|<\/span>&#8211;95.2%&#8211; spin_lock<span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>kvm-<span class=\"token operator\">&gt;<\/span>mmu_lock<span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># &lt;- \u70ed\u70b9<\/span><br \/>\n         <span class=\"token operator\">|<\/span>&#8211;3.1%&#8211;  kvm_unmap_gfn_range<br \/>\n         \u2514\u2500\u25001.2%&#8211;  spin_unlock<\/p>\n<p>\u89e6\u53d1\u6761\u4ef6:<\/p>\n<p><span class=\"token comment\">\/\/ virt\/kvm\/kvm_main.c<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">kvm_mmu_notifier_invalidate_range_start<\/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 punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kvm<\/span> <span class=\"token operator\">*<\/span>kvm <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">mmu_notifier_to_kvm<\/span><span class=\"token punctuation\">(<\/span>mn<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* \u591a\u4e2avCPU\u540c\u65f6page fault\u65f6\u7ade\u4e89\u6b64\u9501 *\/<\/span><br \/>\n<span class=\"token function\">spin_lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>kvm<span class=\"token operator\">-&gt;<\/span>mmu_lock<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>kvm<span class=\"token operator\">-&gt;<\/span>mn_active_invalidate_count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">kvm_unmap_gfn_range<\/span><span class=\"token punctuation\">(<\/span>kvm<span class=\"token punctuation\">,<\/span> range<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8017\u65f6\u64cd\u4f5c<\/span><\/p>\n<p><span class=\"token function\">spin_unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>kvm<span class=\"token operator\">-&gt;<\/span>mmu_lock<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>\u5f71\u54cd\u8303\u56f4:<\/p>\n<ul>\n<li>\u591avCPU\u865a\u62df\u673a&#xff08;\u226516 vCPU&#xff09;<\/li>\n<li>\u5185\u5b58\u5bc6\u96c6\u578b\u5de5\u4f5c\u8d1f\u8f7d<\/li>\n<li>\u5927\u9875\u9762\u6620\u5c04\u573a\u666f&#xff08;1GB huge pages&#xff09;<\/li>\n<\/ul>\n<hr \/>\n<h4>11.1.3 \u8bbe\u5907TLB\u5237\u65b0\u5f00\u9500<\/h4>\n<p>\u786c\u4ef6\u5f00\u9500:<\/p>\n<p><span class=\"token comment\">\/\/ drivers\/gpu\/drm\/amd\/amdgpu\/amdgpu_mn.c<\/span><br \/>\n<span class=\"token keyword\">static<\/span> bool <span class=\"token function\">amdgpu_mn_invalidate_gfx<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mmu_interval_notifier<\/span> <span class=\"token operator\">*<\/span>mni<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 punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/* \u5178\u578bGPU TLB flush\u5ef6\u8fdf *\/<\/span><br \/>\n<span class=\"token function\">amdgpu_vm_invalidate_tlbs<\/span><span class=\"token punctuation\">(<\/span>adev<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/*<br \/>\n * MMIO\u5199\u5165:    ~1us<br \/>\n * GPU\u54cd\u5e94:     10-100us<br \/>\n * \u7b49\u5f85\u5b8c\u6210:    \u53ef\u80fd500us&#043;<br \/>\n *<br \/>\n * \u95ee\u9898: \u5728spinlock\u4e34\u754c\u533a\u5185\u7b49\u5f85 -&gt; \u963b\u585e\u5176\u4ed6CPU<br \/>\n *\/<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u653e\u5927\u6548\u5e94:<\/p>\n<p>\u5355\u6b21munmap(4KB)  -&gt; invalidate(4KB)  -&gt; GPU flush\u6574\u4e2aTLB (100us)<br \/>\n                                            \u2193<br \/>\n                              \u5982\u679c\u662f\u9891\u7e41\u7684\u5c0f\u8303\u56f4\u64cd\u4f5c&#xff0c;\u5f00\u9500\u88ab\u653e\u59271000x<\/p>\n<hr \/>\n<h3>11.2 \u6027\u80fd\u8bca\u65ad\u65b9\u6cd5<\/h3>\n<h4>11.2.1 \u5feb\u901f\u8bca\u65ad\u6d41\u7a0b<\/h4>\n<p>\u6b65\u9aa41: \u89c2\u5bdf\u73b0\u8c61<br \/>\n    \u2502<br \/>\n    \u251c\u2500&gt; \u5e94\u7528\u7a0b\u5e8f\u5361\u4f4f\/\u6162?<br \/>\n    \u2502   \u2514\u2500&gt; \u68c0\u67e5\u662f\u5426\u8d85\u65f6: dmesg | grep &#034;hmm.*timeout&#034;<br \/>\n    \u2502<br \/>\n    \u251c\u2500&gt; GPU\u5229\u7528\u7387\u4f4e?<br \/>\n    \u2502   \u2514\u2500&gt; \u68c0\u67e5\u662f\u5426\u91cd\u8bd5: perf trace -e &#039;mmu_notifier:*&#039;<br \/>\n    \u2502<br \/>\n    \u2514\u2500&gt; CPU\u5360\u7528\u9ad8?<br \/>\n        \u2514\u2500&gt; \u68c0\u67e5\u70ed\u70b9\u51fd\u6570: perf top<\/p>\n<p>\u6b65\u9aa42: \u5b9a\u4f4d\u74f6\u9888<br \/>\n    \u2502<br \/>\n    \u251c\u2500&gt; \u5982\u679c\u770b\u5230\u5927\u91cfretry -&gt; 11.3.1 \u91cd\u8bd5\u4f18\u5316<br \/>\n    \u251c\u2500&gt; \u5982\u679c\u770b\u5230spin_lock -&gt; 11.3.2 \u9501\u4f18\u5316<br \/>\n    \u2514\u2500&gt; \u5982\u679c\u770b\u5230device_* -&gt; 11.3.3 \u8bbe\u5907\u4f18\u5316<\/p>\n<p>\u6b65\u9aa43: \u9a8c\u8bc1\u4fee\u590d<br \/>\n    \u2514\u2500&gt; \u5bf9\u6bd4\u4f18\u5316\u524d\u540e\u6307\u6807&#xff08;\u89c111.2.3&#xff09;<\/p>\n<h4>11.2.2 \u5173\u952e\u76d1\u63a7\u6307\u6807<\/h4>\n<p>\u6dfb\u52a0\u7edf\u8ba1\u4ee3\u7801:<\/p>\n<p><span class=\"token comment\">\/\/ \u5728\u9a71\u52a8\u4e2d\u6dfb\u52a0debugfs\u7edf\u8ba1<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mmu_notifier_stats<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token class-name\">atomic64_t<\/span> invalidate_count<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ invalidate\u603b\u6570<\/span><br \/>\n<span class=\"token class-name\">atomic64_t<\/span> retry_count<span class=\"token punctuation\">;<\/span>           <span class=\"token comment\">\/\/ hmm_range_fault\u91cd\u8bd5\u6b21\u6570<\/span><br \/>\n<span class=\"token class-name\">atomic64_t<\/span> timeout_count<span class=\"token punctuation\">;<\/span>         <span class=\"token comment\">\/\/ \u8d85\u65f6\u6b21\u6570<\/span><br \/>\n<span class=\"token class-name\">atomic64_t<\/span> avg_latency_us<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u5e73\u5747\u5ef6\u8fdf<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8ba1\u7b97\u5173\u952e\u6bd4\u7387<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">show_stats<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">seq_file<\/span> <span class=\"token operator\">*<\/span>m<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mmu_notifier_stats<\/span> <span class=\"token operator\">*<\/span>s<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\nu64 inv <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">atomic64_read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>s<span class=\"token operator\">-&gt;<\/span>invalidate_count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nu64 retry <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">atomic64_read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>s<span class=\"token operator\">-&gt;<\/span>retry_count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nu64 timeout <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">atomic64_read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>s<span class=\"token operator\">-&gt;<\/span>timeout_count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">seq_printf<\/span><span class=\"token punctuation\">(<\/span>m<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;retry_rate: %llu%%\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> inv <span class=\"token operator\">?<\/span> retry <span class=\"token operator\">*<\/span> <span class=\"token number\">100<\/span> <span class=\"token operator\">\/<\/span> inv <span class=\"token operator\">:<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">seq_printf<\/span><span class=\"token punctuation\">(<\/span>m<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;timeout_rate: %llu%%\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> inv <span class=\"token operator\">?<\/span> timeout <span class=\"token operator\">*<\/span> <span class=\"token number\">100<\/span> <span class=\"token operator\">\/<\/span> inv <span class=\"token operator\">:<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">seq_printf<\/span><span class=\"token punctuation\">(<\/span>m<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;avg_latency: %llu us\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n   <span class=\"token function\">atomic64_read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>s<span class=\"token operator\">-&gt;<\/span>avg_latency_us<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>\u5065\u5eb7\u6307\u6807\u9608\u503c:<\/p>\n<p>\u6307\u6807              \u6b63\u5e38\u8303\u56f4      \u8b66\u544a\u9608\u503c      \u4e25\u91cd\u9608\u503c<br \/>\n\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<br \/>\nretry_rate        &lt; 5%         5-15%        &gt; 15%<br \/>\ntimeout_rate      &lt; 0.1%       0.1-1%       &gt; 1%<br \/>\navg_latency       &lt; 100us      100-500us    &gt; 500us<br \/>\ninvalidate_freq   &lt; 1000\/s     1K-10K\/s     &gt; 10K\/s<\/p>\n<h4>11.2.3 Tracepoint\u5b9e\u6218<\/h4>\n<p>\u542f\u7528\u8ffd\u8e2a:<\/p>\n<p><span class=\"token comment\"># \u8ffd\u8e2a\u6240\u6709mmu_notifier\u4e8b\u4ef6<\/span><br \/>\n<span class=\"token builtin class-name\">cd<\/span> \/sys\/kernel\/debug\/tracing<br \/>\n<span class=\"token builtin class-name\">echo<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">&gt;<\/span> events\/mmu_notifier\/enable<br \/>\n<span class=\"token builtin class-name\">echo<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">&gt;<\/span> options\/funcgraph-tail<\/p>\n<p><span class=\"token comment\"># \u67e5\u770b\u5b9e\u65f6\u8f93\u51fa<\/span><br \/>\n<span class=\"token function\">cat<\/span> trace_pipe<\/p>\n<p><span class=\"token comment\"># \u5178\u578b\u8f93\u51fa\u89e3\u8bfb<\/span><br \/>\n  kswapd-100  <span class=\"token punctuation\">[<\/span>002<span class=\"token punctuation\">]<\/span> <span class=\"token number\">123.456<\/span>: mmu_notifier_invalidate_range_start:<br \/>\n                             <span class=\"token assign-left variable\">start<\/span><span class=\"token operator\">&#061;<\/span>0x7f0000 <span class=\"token assign-left variable\">end<\/span><span class=\"token operator\">&#061;<\/span>0x7f1000<br \/>\n  kswapd-100  <span class=\"token punctuation\">[<\/span>002<span class=\"token punctuation\">]<\/span> <span class=\"token number\">123.556<\/span>: mmu_notifier_invalidate_range_end:<br \/>\n                             <span class=\"token assign-left variable\">start<\/span><span class=\"token operator\">&#061;<\/span>0x7f0000 <span class=\"token assign-left variable\">end<\/span><span class=\"token operator\">&#061;<\/span>0x7f1000  <span class=\"token operator\">&lt;<\/span>&#8211; 100us\u5ef6\u8fdf<\/p>\n<p>  app-1000    <span class=\"token punctuation\">[<\/span>004<span class=\"token punctuation\">]<\/span> <span class=\"token number\">123.457<\/span>: hmm_range_fault: <span class=\"token assign-left variable\">ret<\/span><span class=\"token operator\">&#061;<\/span>-EBUSY  <span class=\"token operator\">&lt;<\/span>&#8211; \u51b2\u7a81<span class=\"token operator\">!<\/span><br \/>\n  app-1000    <span class=\"token punctuation\">[<\/span>004<span class=\"token punctuation\">]<\/span> <span class=\"token number\">123.557<\/span>: hmm_range_fault: <span class=\"token assign-left variable\">ret<\/span><span class=\"token operator\">&#061;<\/span>-EBUSY  <span class=\"token operator\">&lt;<\/span>&#8211; \u91cd\u8bd51<br \/>\n  app-1000    <span class=\"token punctuation\">[<\/span>004<span class=\"token punctuation\">]<\/span> <span class=\"token number\">123.657<\/span>: hmm_range_fault: <span class=\"token assign-left variable\">ret<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span>       <span class=\"token operator\">&lt;<\/span>&#8211; \u6210\u529f<\/p>\n<p>\u5206\u6790\u811a\u672c:<\/p>\n<p><span class=\"token shebang important\">#!\/bin\/bash<\/span><br \/>\n<span class=\"token comment\"># \u5206\u6790trace\u65e5\u5fd7&#xff0c;\u7edf\u8ba1\u91cd\u8bd5\u7387<\/span><\/p>\n<p><span class=\"token function\">cat<\/span> trace <span class=\"token operator\">|<\/span> <span class=\"token function\">awk<\/span> <span class=\"token string\">&#039;<br \/>\n\/hmm_range_fault.*-EBUSY\/ { retry&#043;&#043; }<br \/>\n\/hmm_range_fault.*ret&#061;0\/  { success&#043;&#043; }<br \/>\nEND {<br \/>\n    total &#061; retry &#043; success<br \/>\n    print &#034;Total:&#034;, total<br \/>\n    print &#034;Retry:&#034;, retry, &#034;(&#034; retry*100\/total &#034;%)&#034;<br \/>\n    print &#034;Success:&#034;, success, &#034;(&#034; success*100\/total &#034;%)&#034;<br \/>\n}&#039;<\/span><\/p>\n<hr \/>\n<h3>11.3 \u4f18\u5316\u7b56\u7565<\/h3>\n<h4>11.3.1 \u964d\u4f4e\u91cd\u8bd5\u7387<\/h4>\n<p>\u7b56\u75651: \u51cf\u5c0f\u904d\u5386\u7c92\u5ea6<\/p>\n<p><span class=\"token comment\">\/\/ \u4f18\u5316\u524d: \u4e00\u6b21\u6027\u904d\u53861GB<\/span><br \/>\nhmm_range<span class=\"token punctuation\">.<\/span>start <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0x10000000<\/span><span class=\"token punctuation\">;<\/span><br \/>\nhmm_range<span class=\"token punctuation\">.<\/span>end   <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0x50000000<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ 1GB\u8303\u56f4<\/span><br \/>\n<span class=\"token function\">hmm_range_fault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>hmm_range<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u904d\u5386\u8017\u65f6100ms -&gt; \u6781\u6613\u51b2\u7a81<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f18\u5316\u540e: \u5206\u6bb5\u904d\u5386<\/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\">CHUNK_SIZE<\/span> <span class=\"token expression\"><span class=\"token punctuation\">(<\/span><span class=\"token number\">2UL<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span>  <\/span><span class=\"token comment\">\/\/ 2MB per chunk<\/span><\/span><\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>addr <span class=\"token operator\">&#061;<\/span> start<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> CHUNK_SIZE<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nhmm_range<span class=\"token punctuation\">.<\/span>start <span class=\"token operator\">&#061;<\/span> addr<span class=\"token punctuation\">;<\/span><br \/>\nhmm_range<span class=\"token punctuation\">.<\/span>end <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span>addr <span class=\"token operator\">&#043;<\/span> CHUNK_SIZE<span class=\"token punctuation\">,<\/span> end<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>retry<span class=\"token operator\">:<\/span><br \/>\nhmm_range<span class=\"token punctuation\">.<\/span>notifier_seq <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">mmu_interval_read_begin<\/span><span class=\"token punctuation\">(<\/span>notifier<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">hmm_range_fault<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>hmm_range<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u904d\u5386\u4ec52ms -&gt; \u51b2\u7a81\u51cf\u5c1150x<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span>EBUSY <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">!<\/span>timeout<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">goto<\/span> retry<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6548\u679c: retry_rate \u4ece 60% \u964d\u81f3 5%<\/span><\/p>\n<p>\u7b56\u75652: \u63d0\u524d\u68c0\u6d4b\u51b2\u7a81<\/p>\n<p><span class=\"token comment\">\/\/ \u5728\u8017\u65f6\u64cd\u4f5c\u4e2d\u5468\u671f\u6027\u68c0\u67e5<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">device_map_pages<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">device<\/span> <span class=\"token operator\">*<\/span>dev<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token operator\">*<\/span>pfns<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> nr<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> i<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> nr<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/* \u6bcf256\u4e2a\u9875\u9762\u68c0\u67e5\u4e00\u6b21 *\/<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&amp;<\/span> <span class=\"token number\">0xFF<\/span><span class=\"token punctuation\">)<\/span> <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\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">mmu_interval_check_retry<\/span><span class=\"token punctuation\">(<\/span>notifier<span class=\"token punctuation\">,<\/span> seq<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EBUSY<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u63d0\u524d\u7ec8\u6b62&#xff0c;\u8282\u770190%\u65e0\u6548\u5de5\u4f5c<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token function\">device_map_single_page<\/span><span class=\"token punctuation\">(<\/span>dev<span class=\"token punctuation\">,<\/span> pfns<span class=\"token punctuation\">[<\/span>i<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>\u6548\u679c\u5bf9\u6bd4:<\/p>\n<p>\u573a\u666f: \u904d\u538610\u4e07\u9875 &#043; \u6620\u5c04\u5230\u8bbe\u5907 (\u603b\u8017\u65f6100ms)<\/p>\n<p>\u4f18\u5316\u524d:<br \/>\n  &#8211; \u904d\u5386\u5b8c\u6210\u540e\u624dcheck_retry<br \/>\n  &#8211; \u51b2\u7a81\u65f6100ms\u5de5\u4f5c\u5168\u90e8\u4f5c\u5e9f<br \/>\n  &#8211; \u91cd\u8bd510\u6b21 -&gt; \u603b\u5ef6\u8fdf1\u79d2<\/p>\n<p>\u4f18\u5316\u540e:<br \/>\n  &#8211; \u6bcf\u904d\u5386256\u9875check\u4e00\u6b21 (\u6bcf\u6b21\u4ec50.25ms)<br \/>\n  &#8211; \u51b2\u7a81\u65f6\u5e73\u5747\u4ec5\u4f5c\u5e9f50ms\u5de5\u4f5c<br \/>\n  &#8211; \u91cd\u8bd53\u6b21 -&gt; \u603b\u5ef6\u8fdf150ms<\/p>\n<p>\u5ef6\u8fdf\u964d\u4f4e: 1000ms -&gt; 150ms (6.7x\u63d0\u5347)<\/p>\n<hr \/>\n<h4>11.3.2 \u51cf\u5c11\u9501\u7ade\u4e89<\/h4>\n<p>\u7b56\u75651: \u7f29\u5c0f\u4e34\u754c\u533a<\/p>\n<p><span class=\"token comment\">\/\/ \u4f18\u5316\u524d: \u5728\u9501\u5185\u505a\u6240\u6709\u5de5\u4f5c<\/span><br \/>\n<span class=\"token function\">spin_lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>dev<span class=\"token operator\">-&gt;<\/span>lock<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">list_for_each_entry<\/span><span class=\"token punctuation\">(<\/span>mapping<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>dev<span class=\"token operator\">-&gt;<\/span>mappings<span class=\"token punctuation\">,<\/span> list<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\">overlaps<\/span><span class=\"token punctuation\">(<\/span>mapping<span class=\"token punctuation\">,<\/span> range<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token function\">device_unmap<\/span><span class=\"token punctuation\">(<\/span>dev<span class=\"token punctuation\">,<\/span> mapping<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8017\u65f6\u64cd\u4f5c<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token function\">spin_unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>dev<span class=\"token operator\">-&gt;<\/span>lock<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f18\u5316\u540e: \u9501\u5916\u505a\u8017\u65f6\u5de5\u4f5c<\/span><br \/>\n<span class=\"token function\">LIST_HEAD<\/span><span class=\"token punctuation\">(<\/span>unmap_list<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* \u5feb\u901f\u6536\u96c6\u9700\u8981unmap\u7684\u9879 *\/<\/span><br \/>\n<span class=\"token function\">spin_lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>dev<span class=\"token operator\">-&gt;<\/span>lock<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">list_for_each_entry_safe<\/span><span class=\"token punctuation\">(<\/span>mapping<span class=\"token punctuation\">,<\/span> next<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>dev<span class=\"token operator\">-&gt;<\/span>mappings<span class=\"token punctuation\">,<\/span> list<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\">overlaps<\/span><span class=\"token punctuation\">(<\/span>mapping<span class=\"token punctuation\">,<\/span> range<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token function\">list_move<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>mapping<span class=\"token operator\">-&gt;<\/span>list<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>unmap_list<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token function\">spin_unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>dev<span class=\"token operator\">-&gt;<\/span>lock<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* \u9501\u5916\u5904\u7406 *\/<\/span><br \/>\n<span class=\"token function\">list_for_each_entry_safe<\/span><span class=\"token punctuation\">(<\/span>mapping<span class=\"token punctuation\">,<\/span> next<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>unmap_list<span class=\"token punctuation\">,<\/span> list<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token function\">device_unmap<\/span><span class=\"token punctuation\">(<\/span>dev<span class=\"token punctuation\">,<\/span> mapping<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7b56\u75652: \u4f7f\u7528trylock\u907f\u514d\u6b7b\u9501<\/p>\n<p><span class=\"token keyword\">static<\/span> bool <span class=\"token function\">device_invalidate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">mmu_interval_notifier<\/span> <span class=\"token operator\">*<\/span>mni<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 punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">device_ctx<\/span> <span class=\"token operator\">*<\/span>ctx <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">container_of<\/span><span class=\"token punctuation\">(<\/span>mni<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 class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* \u5173\u952e: \u4e0d\u80fd\u963b\u585e\u7b49\u5f85&#xff08;\u53ef\u80fd\u6b7b\u9501&#xff09; *\/<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token function\">mutex_trylock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>ctx<span class=\"token operator\">-&gt;<\/span>device_lock<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\">\/\/ \u8fd4\u56defalse\u8ba9\u5185\u6838\u91cd\u8bd5\u6574\u4e2a\u64cd\u4f5c<\/span><\/p>\n<p><span class=\"token function\">mmu_interval_set_seq<\/span><span class=\"token punctuation\">(<\/span>mni<span class=\"token punctuation\">,<\/span> cur_seq<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">device_flush_tlb<\/span><span class=\"token punctuation\">(<\/span>ctx<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">mutex_unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>ctx<span class=\"token operator\">-&gt;<\/span>device_lock<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<hr \/>\n<h4>11.3.3 \u4f18\u5316interval\u7c92\u5ea6<\/h4>\n<p>\u95ee\u9898: \u7c92\u5ea6\u9009\u62e9\u5f71\u54cd\u6027\u80fd<\/p>\n<p><span class=\"token comment\">\/\/ \u65b9\u6848A: \u7ec6\u7c92\u5ea6&#xff08;\u6bcf\u9875\u4e00\u4e2anotifier&#xff09;<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">262144<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ 1GB \/ 4KB<\/span><br \/>\n<span class=\"token function\">mmu_interval_notifier_insert<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>notifiers<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> mm<span class=\"token punctuation\">,<\/span><br \/>\n     addr <span class=\"token operator\">&#043;<\/span> i <span class=\"token operator\">*<\/span> PAGE_SIZE<span class=\"token punctuation\">,<\/span> PAGE_SIZE<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>ops<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* \u4f18\u70b9: invalidate\u7cbe\u786e&#xff0c;\u53eaflush\u76f8\u5173\u9875<br \/>\n * \u7f3a\u70b9:<br \/>\n *   &#8211; 26\u4e07\u4e2ainterval tree\u8282\u70b9<br \/>\n *   &#8211; \u67e5\u627e\u5f00\u9500 O(log N) \u53d8\u5927<br \/>\n *   &#8211; \u5185\u5b58\u5f00\u9500: 26\u4e07 * 64\u5b57\u8282 &#061; 16MB<br \/>\n *\/<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u65b9\u6848B: \u7c97\u7c92\u5ea6&#xff08;\u6574\u4e2a\u533a\u57df\u4e00\u4e2anotifier&#xff09;<\/span><br \/>\n<span class=\"token function\">mmu_interval_notifier_insert<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>notifier<span class=\"token punctuation\">,<\/span> mm<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span>GB<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>ops<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* \u4f18\u70b9: \u7ba1\u7406\u7b80\u5355&#xff0c;\u5185\u5b58\u5f00\u9500\u5c0f<br \/>\n * \u7f3a\u70b9:<br \/>\n *   &#8211; munmap(4KB) \u4e5f\u4f1a\u89e6\u53d1flush\u6574\u4e2a1GB\u7684\u8bbe\u5907TLB<br \/>\n *   &#8211; \u5047\u5171\u4eab\u4e25\u91cd<br \/>\n *\/<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u65b9\u6848C: \u4e2d\u7b49\u7c92\u5ea6&#xff08;2MB\u5757&#xff09;\u2605 \u63a8\u8350<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">512<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ 1GB \/ 2MB<\/span><br \/>\n<span class=\"token function\">mmu_interval_notifier_insert<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>notifiers<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> mm<span class=\"token punctuation\">,<\/span><br \/>\n     addr <span class=\"token operator\">&#043;<\/span> i <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">2UL<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2UL<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>ops<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* \u5e73\u8861\u70b9:<br \/>\n *   &#8211; 512\u4e2a\u8282\u70b9&#xff0c;\u67e5\u627e\u5feb<br \/>\n *   &#8211; \u5185\u5b58\u5f00\u9500: 32KB (\u53ef\u63a5\u53d7)<br \/>\n *   &#8211; invalidate\u7c92\u5ea6: 2MB (\u4e0eTHP\u5bf9\u9f50)<br \/>\n *   &#8211; \u9002\u5408\u5927\u591a\u6570\u573a\u666f<br \/>\n *\/<\/span><\/p>\n<p>\u8c03\u4f18\u6307\u5357:<\/p>\n<p>\u5de5\u4f5c\u8d1f\u8f7d\u7279\u5f81           \u63a8\u8350\u7c92\u5ea6        \u539f\u56e0<br \/>\n\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500<br \/>\n\u7a00\u758f\u8bbf\u95ee&#xff08;&lt;10%\u5229\u7528\u7387&#xff09; 4KB-64KB       \u51cf\u5c11\u5047\u5171\u4eab<br \/>\n\u5bc6\u96c6\u8bbf\u95ee&#xff08;&gt;90%\u5229\u7528\u7387&#xff09; 2MB-1GB        \u51cf\u5c11\u7ba1\u7406\u5f00\u9500<br \/>\n\u968f\u673a\u8bbf\u95ee               \u5339\u914d\u8bbf\u95ee\u6a21\u5f0f    \u81ea\u9002\u5e94\u8c03\u6574<br \/>\n\u5927\u9875\u5e94\u7528&#xff08;THP\/HugeTLB&#xff09;2MB\/1GB        \u4e0e\u9875\u5927\u5c0f\u5bf9\u9f50<\/p>\n<hr \/>\n<h3>11.4 \u5b9e\u6218\u6848\u4f8b<\/h3>\n<h4>\u6848\u4f8b: GPU\u6e32\u67d3\u5361\u987f\u95ee\u9898<\/h4>\n<p>\u95ee\u9898\u63cf\u8ff0:<\/p>\n<p>\u5e94\u7528: Blender 3D\u6e32\u67d3 (GPU\u52a0\u901f)<br \/>\n\u73b0\u8c61: \u6e32\u67d3\u5e27\u7387\u4ece60fps\u7a81\u7136\u964d\u81f35fps<br \/>\n\u73af\u5883: 32GB\u5185\u5b58&#xff0c;\u4f7f\u7528\u4e8628GB&#xff08;\u5185\u5b58\u538b\u529b\u5927&#xff09;<\/p>\n<p>\u6b65\u9aa41: \u8bca\u65ad<\/p>\n<p><span class=\"token comment\"># \u67e5\u770bGPU\u9a71\u52a8\u65e5\u5fd7<\/span><br \/>\n$ <span class=\"token function\">dmesg<\/span> <span class=\"token operator\">|<\/span> <span class=\"token function\">grep<\/span> amdgpu<br \/>\n<span class=\"token punctuation\">[<\/span>drm:amdgpu_hmm_range_get_pages<span class=\"token punctuation\">]<\/span> *ERROR* hmm_range_fault <span class=\"token function\">timeout<\/span> after <span class=\"token number\">300<\/span> retries<\/p>\n<p><span class=\"token comment\"># \u542f\u7528tracepoint<\/span><br \/>\n$ <span class=\"token builtin class-name\">echo<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">&gt;<\/span> \/sys\/kernel\/debug\/tracing\/events\/mmu_notifier\/enable<br \/>\n$ <span class=\"token function\">cat<\/span> \/sys\/kernel\/debug\/tracing\/trace_pipe<br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token punctuation\">..<\/span>.<span class=\"token operator\">&gt;<\/span>-1000 <span class=\"token punctuation\">[<\/span>002<span class=\"token punctuation\">]<\/span> hmm_range_fault: <span class=\"token assign-left variable\">start<\/span><span class=\"token operator\">&#061;<\/span>0x7f<span class=\"token punctuation\">..<\/span>. <span class=\"token assign-left variable\">end<\/span><span class=\"token operator\">&#061;<\/span>0x7f<span class=\"token punctuation\">..<\/span>. <span class=\"token assign-left variable\">ret<\/span><span class=\"token operator\">&#061;<\/span>-EBUSY<br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token punctuation\">..<\/span>.<span class=\"token operator\">&gt;<\/span>-1000 <span class=\"token punctuation\">[<\/span>002<span class=\"token punctuation\">]<\/span> hmm_range_fault: <span class=\"token assign-left variable\">start<\/span><span class=\"token operator\">&#061;<\/span>0x7f<span class=\"token punctuation\">..<\/span>. <span class=\"token assign-left variable\">end<\/span><span class=\"token operator\">&#061;<\/span>0x7f<span class=\"token punctuation\">..<\/span>. <span class=\"token assign-left variable\">ret<\/span><span class=\"token operator\">&#061;<\/span>-EBUSY<br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token punctuation\">..<\/span>.<span class=\"token operator\">&gt;<\/span>-1000 <span class=\"token punctuation\">[<\/span>002<span class=\"token punctuation\">]<\/span> hmm_range_fault: <span class=\"token assign-left variable\">start<\/span><span class=\"token operator\">&#061;<\/span>0x7f<span class=\"token punctuation\">..<\/span>. <span class=\"token assign-left variable\">end<\/span><span class=\"token operator\">&#061;<\/span>0x7f<span class=\"token punctuation\">..<\/span>. <span class=\"token assign-left variable\">ret<\/span><span class=\"token operator\">&#061;<\/span>-EBUSY<br \/>\n<span class=\"token comment\"># &#8230; \u6301\u7eed\u91cd\u8bd5<\/span><\/p>\n<p><span class=\"token comment\"># \u6839\u56e0: \u5185\u5b58\u538b\u529b -&gt; kswapd\u9891\u7e41\u56de\u6536 -&gt; \u5927\u91cfinvalidate -&gt; \u91cd\u8bd5\u98ce\u66b4<\/span><\/p>\n<p>\u6b65\u9aa42: \u4f18\u5316<\/p>\n<p><span class=\"token comment\">\/\/ \u539f\u4ee3\u7801&#xff08;amdgpu_hmm.c&#xff09;<\/span><br \/>\nhmm_range<span class=\"token operator\">-&gt;<\/span>start <span class=\"token operator\">&#061;<\/span> start<span class=\"token punctuation\">;<\/span><br \/>\nhmm_range<span class=\"token operator\">-&gt;<\/span>end <span class=\"token operator\">&#061;<\/span> start <span class=\"token operator\">&#043;<\/span> npages <span class=\"token operator\">*<\/span> PAGE_SIZE<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6700\u5927512MB<\/span><br \/>\nret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">hmm_range_fault<\/span><span class=\"token punctuation\">(<\/span>hmm_range<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>              <span class=\"token comment\">\/\/ \u904d\u538650ms -&gt; \u6613\u51b2\u7a81<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4fee\u6539\u4e3a\u5206\u6bb5\u904d\u5386<\/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\">MAX_WALK_SIZE<\/span> <span class=\"token expression\"><span class=\"token punctuation\">(<\/span><span class=\"token number\">2UL<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span>  <\/span><span class=\"token comment\">\/\/ 2MB<\/span><\/span><\/p>\n<p><span class=\"token keyword\">do<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nhmm_range<span class=\"token operator\">-&gt;<\/span>end <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span>hmm_range<span class=\"token operator\">-&gt;<\/span>start <span class=\"token operator\">&#043;<\/span> MAX_WALK_SIZE<span class=\"token punctuation\">,<\/span> end<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>timeout <span class=\"token operator\">&#061;<\/span> jiffies <span class=\"token operator\">&#043;<\/span> <span class=\"token function\">msecs_to_jiffies<\/span><span class=\"token punctuation\">(<\/span>HMM_RANGE_DEFAULT_TIMEOUT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nretry<span class=\"token operator\">:<\/span><br \/>\nhmm_range<span class=\"token operator\">-&gt;<\/span>notifier_seq <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">mmu_interval_read_begin<\/span><span class=\"token punctuation\">(<\/span>notifier<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">hmm_range_fault<\/span><span class=\"token punctuation\">(<\/span>hmm_range<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">&#8211;<\/span>EBUSY<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\">time_after<\/span><span class=\"token punctuation\">(<\/span>jiffies<span class=\"token punctuation\">,<\/span> timeout<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">goto<\/span> retry<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>hmm_range<span class=\"token operator\">-&gt;<\/span>hmm_pfns <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token punctuation\">(<\/span>hmm_range<span class=\"token operator\">-&gt;<\/span>end <span class=\"token operator\">&#8211;<\/span> hmm_range<span class=\"token operator\">-&gt;<\/span>start<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;&gt;<\/span> PAGE_SHIFT<span class=\"token punctuation\">;<\/span><br \/>\nhmm_range<span class=\"token operator\">-&gt;<\/span>start <span class=\"token operator\">&#061;<\/span> hmm_range<span class=\"token operator\">-&gt;<\/span>end<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>hmm_range<span class=\"token operator\">-&gt;<\/span>start <span class=\"token operator\">&lt;<\/span> end<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6b65\u9aa43: \u9a8c\u8bc1<\/p>\n<p><span class=\"token comment\"># \u4f18\u5316\u524d<\/span><br \/>\n$ <span class=\"token function\">cat<\/span> \/sys\/kernel\/debug\/dri\/0\/amdgpu_hmm_stats<br \/>\ninvalidate_count: <span class=\"token number\">10523<\/span><br \/>\nretry_count: <span class=\"token number\">8942<\/span><br \/>\nretry_rate: <span class=\"token number\">85<\/span>%          <span class=\"token comment\"># &lt;- \u4e25\u91cd<\/span><br \/>\ntimeout_count: <span class=\"token number\">142<\/span><br \/>\navg_latency: 523us<\/p>\n<p><span class=\"token comment\"># \u4f18\u5316\u540e<\/span><br \/>\n$ <span class=\"token function\">cat<\/span> \/sys\/kernel\/debug\/dri\/0\/amdgpu_hmm_stats<br \/>\ninvalidate_count: <span class=\"token number\">10891<\/span><br \/>\nretry_count: <span class=\"token number\">612<\/span><br \/>\nretry_rate: <span class=\"token number\">5.6<\/span>%         <span class=\"token comment\"># &lt;- \u6b63\u5e38<\/span><br \/>\ntimeout_count: <span class=\"token number\">0<\/span><br \/>\navg_latency: 87us<\/p>\n<p><span class=\"token comment\"># \u5e94\u7528\u8868\u73b0<\/span><br \/>\nBlender\u5e27\u7387: 5fps &#8211;<span class=\"token operator\">&gt;<\/span> 58fps <span class=\"token punctuation\">(<\/span><span class=\"token number\">11<\/span>.6x\u63d0\u5347<span class=\"token punctuation\">)<\/span><\/p>\n<hr \/>\n<h3>11.5 \u6027\u80fd\u8c03\u4f18\u6e05\u5355<\/h3>\n<h4>\u8bbe\u8ba1\u9636\u6bb5<\/h4>\n<p>\u25a1 \u9009\u62e9mmu_interval_notifier\u800c\u975emmu_notifier<br \/>\n\u25a1 \u9009\u62e9\u5408\u9002\u7684interval\u7c92\u5ea6&#xff08;\u63a8\u83502MB&#xff09;<br \/>\n\u25a1 \u8bbe\u8ba1\u975e\u963b\u585e\u7684invalidate\u56de\u8c03&#xff08;\u4f7f\u7528trylock&#xff09;<br \/>\n\u25a1 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