{"id":17138,"date":"2025-04-18T23:37:51","date_gmt":"2025-04-18T15:37:51","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/17138.html"},"modified":"2025-04-18T23:37:51","modified_gmt":"2025-04-18T15:37:51","slug":"linux%e5%86%85%e5%ad%98%e7%ae%a1%e7%90%86%e4%b8%ad%e9%94%81%e4%bd%bf%e7%94%a8%e5%88%86%e6%9e%90%e5%8f%8a%e5%85%b8%e5%9e%8b%e4%bc%98%e5%8c%96%e6%a1%88%e4%be%8b%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/17138.html","title":{"rendered":"Linux\u5185\u5b58\u7ba1\u7406\u4e2d\u9501\u4f7f\u7528\u5206\u6790\u53ca\u5178\u578b\u4f18\u5316\u6848\u4f8b\u603b\u7ed3"},"content":{"rendered":"

1\u6280\u672f\u80cc\u666f   <\/p>\n

\u9501\u5728Linux\u5185\u5b58\u7ba1\u7406\u4e2d\u8d77\u7740\u975e\u5e38\u91cd\u8981\u7684\u4f5c\u7528\u3002\u4e00\u65b9\u9762\uff0c\u9501\u5728\u5185\u5b58\u7ba1\u7406\u4e2d\u4fdd\u62a4\u4e86\u591a\u7ebf\u7a0b\u7684\u4e34\u754c\u533a\u5e76\u53d1\u5904\u7406; \u53e6\u4e00\u65b9\u9762\uff0c\u5185\u5b58\u7ba1\u7406\u5404\u79cd\u9501\u7684\u4f7f\u7528\u5728\u4e00\u4e9b\u573a\u666f\u4e5f\u4f1a\u8868\u73b0\u51fa\u6027\u80fd\u95ee\u9898\u3002\u672c\u6587\u9488\u5bf9\u5185\u6838\u5185\u5b58\u7ba1\u7406\u4e2d\u5178\u578b\u7684\u9501\u8fdb\u884c\u4ecb\u7ecd\u53ca\u5178\u578b\u4f18\u5316\u6848\u4f8b\u603b\u7ed3\u3002<\/p>\n

\u672c\u6587\u5206\u6790\u57fa\u4e8eLinux\u5185\u68386.9\u7248\u672c(\u90e8\u5206\u4e3a\u4f4e\u7248\u672c\u5185\u6838\uff0c\u4f1a\u7279\u522b\u8bf4\u660e)\u3002<\/p>\n

2\u5185\u5b58\u7ba1\u7406\u4e2d\u7684\u9501   <\/h2>\n

2.1PG_Locked   <\/h3>\n

Linux\u5185\u6838\u7269\u7406\u5185\u5b58\u4f7f\u7528page\u8fdb\u884c\u7ba1\u7406\uff0cpage\u7684\u4f7f\u7528\u9700\u8981\u8003\u8651\u5e76\u53d1\u5904\u7406\uff0c\u5728\u5185\u6838\u4e2d\u501f\u52a9PG_locked\u5b9e\u73b0\uff0c\u5f53page\u88ab\u6807\u8bb0\u4e86PG_locked\u65f6\u8868\u660epage\u5df2\u7ecf\u88ab\u9501\u5b9a\uff0c\u6b63\u5728\u4f7f\u7528\u4e2d\uff0c\u4e0d\u8981\u4fee\u6539\u3002page\u7ed3\u6784\u4f53\u4e2d\u5b9a\u4e49\u4e86flag\u53ef\u4ee5\u8868\u793a\u662f\u5426\u88ab\u9501\u5b9a\u3002<\/p>\n\n\n\n
\n

struct page {\n <\/p>\n

       unsigned long <\/span>flags;              \/* Atomic flags, some possibly<\/span>        <\/p>\n

                                    * updated asynchronously *\/<\/p>\n

\u2026<\/p>\n

}<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5185\u6838\u4e2d\u4f7f\u7528lock_page\u6765\u5bf9page\u4e0a\u9501\u3002\u63a5\u53e3\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\n

static inline bool folio_trylock(struct folio *folio)<\/p>\n

{\n <\/p>\n

       return likely(!test_and_set_bit_lock(PG_locked, folio_flags(folio, 0)));<\/p>\n

}<\/p>\n

void __folio_lock(struct folio *folio)<\/p>\n

{\n <\/p>\n

       folio_wait_bit_common(folio, PG_locked, TASK_UNINTERRUPTIBLE,<\/p>\n

                            EXCLUSIVE);<\/p>\n

}<\/p>\n

static inline void lock_page(struct page *page)<\/p>\n

{
\n        <\/p>\n

       struct folio *folio;<\/p>\n

       might_sleep();<\/p>\n

       folio = page_folio(page);<\/p>\n

       if (!folio_trylock(folio))<\/p>\n

              __folio_lock(folio);<\/p>\n

}<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4ece\u4e0a\u9762\u4ee3\u7801\u53ef\u4ee5\u770b\u5230\uff0clock_page\u662f\u53ef\u80fd\u5b58\u5728\u7761\u7720\u7684\uff0c\u56e0\u6b64\uff0c\u4e0d\u8981\u5728\u4e0d\u53ef\u7761\u7720\u7684\u4e0a\u4e0b\u6587\u4f7f\u7528\u3002\u5b83\u4f1a\u5c1d\u8bd5\u5bf9page\u8bbe\u7f6ePG_locked\u6807\u8bb0\uff0c\u5982\u679cpage\u7684PG_locked\u5df2\u7ecf\u88ab\u7f6e\u4f4d\uff0c\u4e5f\u5c31\u662f\u6b64\u65f6\u6709\u4eba\u6b63\u5728\u8bbf\u95ee\u6b64page,\u4f1a\u901a\u8fc7__folio_lock\u8bbe\u7f6euninterruptable sleep\u72b6\u6001\u7b49\u5f85PG_locked\u6807\u8bb0\u88ab\u6e05\u9664\u3002<\/p>\n

\u4ee5\u5178\u578b\u7684filemap_fault\u4e3a\u4f8b\uff0c\u4f7f\u7528PG_locked\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n

\"3d03102eea4dbc975418fa1384427d25.png\"<\/p>\n

filemap_fault \u00e0 __filemap_get_folio \u00e0filemap_get_pages \u00e0 filemap_add_folio\u00e0 __folio_set_locked(\u8bbe\u7f6epage\u7684PG_locked)    <\/p>\n

filemap_read_folio\u00e0 folio_wait_locked_killable\u00e0 folio_wait_bit_killable(folio, PG_locked) \u2013> folio_wait_bit_common(\u7b49IO\u5b8c\u6210PG_locked\u88ab\u6e05\u9664)<\/p>\n

mpage_read_end_io\u00e0folio_mark_uptodate\u00e0folio_unlock(IO\u5b8c\u6210\u65f6\u4f1a\u6807\u8bb0page\u7684PG_update\uff0c\u540c\u65f6\u6e05\u9664PG_locked)\u3002<\/p>\n

\u7b80\u5355\u6765\u8bf4\uff0c\u5f53\u53d1\u751f\u6587\u4ef6\u9875pagefault\uff0c\u6240\u9700\u5185\u5b58\u4e0d\u5728\u6587\u4ef6\u7f13\u5b58\u65f6\uff0c\u4f1a\u5206\u914dpage\u9875\u9762,\u53d1\u8d77IO\u8bfb\u64cd\u4f5c\uff0c\u4f46\u8fd9\u91ccIO\u8bfb\u64cd\u4f5c\u4ec5\u4e0b\u53d1IO\u8bfb\u8bf7\u6c42\uff0c\u8fd8\u4e0d\u80fd\u4fdd\u8bc1page\u4e2d\u5df2\u7ecf\u8bfb\u53d6\u5230\u6240\u9700\u5185\u5bb9\uff0c\u56e0\u6b64\u4f1a\u5728\u4e0b\u53d1IO\u8bfb\u8bf7\u6c42\u524d\u8bbe\u7f6e\u4e86PG_locked\u6807\u8bb0\uff0c\u5f53IO\u5b8c\u6210\u65f6\uff0c\u4f1a\u6e05\u9664PG_locked\u6807\u8bb0\u3002\u8fd9\u4e5f\u5c31\u662f\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u5728systrace\u4e2d\u770b\u5230blockio\u9ec4\u6761\u65f6\u4e00\u822c\u4f1ablocked reson\u4e3afolio_wait_bit_killable\u7684\u539f\u56e0\u3002<\/p>\n

\u540c\u7406\uff0c\u533f\u540d\u9875\u53d1\u751fpage fault\u65f6\u4e5f\u662f\u7c7b\u4f3c\u6d41\u7a0b\uff0c\u53ea\u662f\u5982\u679c\u4f7f\u7528zram\u65f6\uff0c\u6ca1\u6709\u5b9e\u9645\u7684IO\u800c\u5df2\u3002\u6574\u4e2a\u8fc7\u7a0b\u540c\u6837\u4e5f\u662f\u7531PG_locked\u63a7\u5236\u9875\u9762\u7b49\u5f85\u53ca\u5b8c\u6210\u8bfb\u53d6\uff08\u89e3\u538b\u7f29\uff09\u7684\u5e76\u53d1\u8fc7\u7a0b\u3002<\/p>\n

2.2lru_lock  <\/h3>\n

Linux\u5185\u6838\u5728\u5185\u5b58\u56de\u6536\u662f\u4f7f\u7528LRU\uff08Last Recent Used\uff09\u7b97\u6cd5\uff0c\u5373\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\u7b97\u6cd5\u3002\u5728\u5185\u5b58\u56de\u6536\u65f6\u626b\u63cfactive\u548cinactive LRU\u94fe\u8868\u8fdb\u884c\u3002lruvec\u7ed3\u6784\u4f53\u4e2d\u6709\u4e00\u4e2a\u81ea\u65cb\u9501\u4fdd\u62a4LRU\u94fe\u8868\u7684\u64cd\u4f5c\u8fc7\u7a0b\u7684\u5e76\u53d1\u95ee\u9898\u3002    <\/p>\n\n\n\n
\n

struct lruvec {\n <\/p>\n

       struct list_head              lists[NR_LRU_LISTS];<\/p>\n

       \/* per lruvec lru_lock for memcg *\/<\/p>\n

       <\/span>spinlock_t                     lru_lock;<\/span><\/p>\n

}<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

shrink_inactive_list\u548cshrink_active_list\u7b49\u5178\u578b\u7684\u64cd\u4f5cLRU\u7684\u8fc7\u7a0b\u90fd\u9700\u8981\u6301\u6709\u6b64\u9501\u3002\u4e0b\u9762\u4ee5shrink_inactive_list\u4e3a\u4f8b\uff0c\u5217\u4e3e\u4e86\u9501\u7684\u4f7f\u7528\u8fc7\u7a0b\u3002<\/p>\n

\"8f6b967743fdbc6cfa9977ce00f6af57.png\"<\/p>\n

2.3mmap_lock   <\/h3>\n

Linux\u5185\u6838\u7528vma\u8868\u793a\u8fdb\u7a0b\u5730\u5740\u7a7a\u95f4\uff0c\u8fdb\u7a0b\u5730\u5740\u7684\u8bbf\u95ee\u53d7mmap_lock\u9501\u4fdd\u62a4\u3002mmap_lock\u662f\u5b9a\u4e49\u5728mm_struct\u4e2d\u7684\u8bfb\u5199\u4fe1\u53f7\u91cf\u6210\u5458\u3002<\/p>\n\n\n\n
\n

struct mm_struct {\n <\/p>\n

       \u2026<\/p>\n

              struct rw_semaphore mmap_lock;<\/p>\n

\u2026<\/p>\n

}<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

mmap_lock\u4fdd\u62a4\u8fdb\u7a0b\u865a\u62df\u5730\u5740vma rbtree\u3001vma list\u3001vma flags\u7b49\u3002\u8fdb\u7a0b\u53d1\u751fpage fault\u7f3a\u9875\uff0cmmap, mprotect\u7b49\u8bbf\u95eevma\u7684\u64cd\u4f5c\u65f6\uff0c\u53ef\u80fd\u4f1a\u6301\u6709\u8be5\u9501\u3002<\/p>\n

\u83b7\u53d6mmap_lock\u5199\u9501\u4e00\u822c\u4ee5\u4e0b\u5178\u578b\u63a5\u53e3\uff1a<\/p>\n

mmap_write_trylock<\/p>\n

mmap_write_lock_killable<\/p>\n

mmap_write_lock<\/p>\n

mmap_write_lock_nested<\/p>\n

\u6211\u4eec\u4ee5mmap_write_lock_killable\u4e3a\u4f8b\u770b\u4e0b\u5177\u4f53\u7684API\u5b9e\u73b0\uff1a<\/p>\n\n\n\n
\n

#define TASK_KILLABLE                     (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)<\/span>        <\/p>\n

static inline int __down_write_killable(struct rw_semaphore *sem)<\/p>\n

{\n <\/p>\n

       return __down_write_common(sem, TASK_KILLABLE);<\/p>\n

}<\/p>\n

int __sched down_write_killable(struct rw_semaphore *sem)<\/p>\n

{\n <\/p>\n

       might_sleep();<\/p>\n

       rwsem_acquire(&sem->dep_map, 0, 0, _RET_IP_);<\/p>\n

       if (LOCK_CONTENDED_RETURN(sem, __down_write_trylock,<\/p>\n

                              __down_write_killable)) {\n <\/p>\n

              rwsem_release(&sem->dep_map, _RET_IP_);<\/p>\n

              return -EINTR;<\/p>\n

       }<\/span>        <\/p>\n

       return 0;<\/p>\n

}<\/p>\n

static inline int mmap_write_lock_killable(struct mm_struct *mm)<\/p>\n

{\n <\/p>\n

       int ret;<\/p>\n

       __mmap_lock_trace_start_locking(mm, true);<\/p>\n

       ret = down_write_killable(&mm->mmap_lock);<\/p>\n

       __mmap_lock_trace_acquire_returned(mm, true, ret == 0);<\/p>\n

       return ret;<\/p>\n

}<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4ece\u4e0a\u9762\u53ef\u4ee5\u770b\u51fadown_write_killable\u83b7\u53d6mmap_lock\u8fc7\u7a0b\u53ef\u80fd\u4f1asleep\uff0c\u56e0\u6b64\u8c03\u7528\u8005\u9700\u8981\u6ce8\u610f\u4e0d\u80fd\u4f7f\u7528\u5728\u4e0d\u53ef\u7761\u7720\u4e0a\u4e0b\u6587\u3002\u5982\u679c\u6210\u529f\u83b7\u53d6\u5230\u9501\uff0c\u8fd4\u56de0\uff0c\u5982\u679c\u83b7\u53d6\u4e0d\u5230\u9501\uff08\u9501\u5df2\u7ecf\u88ab\u5176\u5b83\u7ebf\u7a0b\u6301\u6709\uff09\uff0c\u4f1a\u8bbe\u7f6e\u5f53\u524d\u8fdb\u7a0b\u4e3aTASK_KILLABLE\u72b6\u6001\uff0cTASK_KILLABLE\u72b6\u6001\u5176\u5b9e\u5c31\u662f\u53ef\u6740\u7684D\u72b6\u6001\uff0c\u4ece\u5b8f\u5b9a\u4e49\u53ef\u4ee5\u5230\u5b83\u662fTASK_WAKEKILL | TASK_UNINTERRUPTIBLE\u7684\u7ec4\u5408\u3002    <\/p>\n

\u5728systrace\u4e2d\u7ecf\u5e38\u53ef\u4ee5\u770b\u5230\u8fd9\u51e0\u4e2a\u51fd\u6570\u7684block reson\u7684\u7d2b\u8272\u7684uninterruptable sleep\u7684D\u72b6\u6001\u3002<\/p>\n

mprotect\u53ef\u4ee5\u7528\u6765\u4fee\u6539\u4e00\u6bb5\u6307\u5b9a\u5185\u5b58\u533a\u57df\u7684\u4fdd\u62a4\u5c5e\u6027\u3002\u7531\u4e8e\u5b83\u4f1a\u4fee\u6539\u8fdb\u7a0bvma\u533a\u57dfflag\uff0c\u56e0\u6b64\uff0c\u4e3a\u4e86\u5904\u7406\u5e76\u53d1\u95ee\u9898\uff0c\u9700\u8981mmap_lock\u7684\u4fdd\u62a4\u3002\u6211\u4eec\u4ee5mprotect\u4e3a\u4f8b\uff0c\u5206\u6790mmap_lock\u7684\u4f7f\u7528\u3002<\/p>\n

\"2fe70ab1cde61df70b76f3befb779e7e.png\"<\/p>\n

\u5185\u6838\u4e2d\u7684 mmap_lock\uff08\u57285.15\u4e4b\u524d\u7684\u5185\u6838\u7248\u672c\u4e2d\u79f0\u4e3a mmap_sem\uff09\u9501\uff0c\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u8bfb\u5199\u9501\uff0c\u53ef\u4ee5\u652f\u6301\u5e76\u53d1\u7684\u591a\u7ebf\u7a0b\u8bfb\u8bbf\u95ee\u3002\u7136\u800c\uff0c\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u5373\u4f7f\u9700\u8981\u83b7\u53d6\u8bfb\u53d6\u8005\uff08reader\uff09\u8bfb\u9501\uff0c\u4e5f\u9700\u8981\u7b49\u5f85\uff0c\u8fd9\u65f6\u8be5\u9501\u5b9e\u9645\u4e0a\u5c31\u53d8\u6210\u4e86\u4e92\u65a5\u9501\u3002\u8fd9\u79cd\u60c5\u51b5\u5e38\u89c1\u4e8e\u4e0b\u9762\u4e24\u79cd\u573a\u666f\uff1a<\/p>\n

1\uff09 \u7ebf\u7a0b1\u6301\u6709\u5199\u9501\uff0c\u7ebf\u7a0b2\u5c1d\u8bd5\u83b7\u53d6\u8bfb\u9501\u3002<\/p>\n

\u7ebf\u7a0b1\u6301\u6709\u5199\u9501\u65f6\uff0c\u7ebf\u7a0b2\u9700\u8981\u7b49\u5f85\u76f4\u5230\u7ebf\u7a0b1\u91ca\u653e\u5199\u9501\u3002\u8fd9\u79cd\u884c\u4e3a\u786e\u4fdd\u4e86\u5728\u6709\u5199\u8005\u7684\u60c5\u51b5\u4e0b\uff0c\u5176\u4ed6\u7ebf\u7a0b\uff08\u5305\u62ec\u8bfb\u8005\uff09\u5c06\u88ab\u963b\u585e\u3002\u8fd9\u79cd\u7b49\u5f85\u76f4\u5230\u5199\u9501\u91ca\u653e\u7684\u6a21\u5f0f\u7c7b\u4f3c\u4e8e\u4e92\u65a5\u9501\u7684\u884c\u4e3a\u3002    <\/p>\n

2\uff09 \u7ebf\u7a0b1\u6301\u6709\u8bfb\u9501\uff0c\u7ebf\u7a0b2\u5c1d\u8bd5\u83b7\u53d6\u5199\u9501\uff0c\u540e\u7eed\u7ebf\u7a0b3\u4e5f\u5c1d\u8bd5\u83b7\u53d6\u8bfb\u9501\uff1a<\/p>\n

\u7ebf\u7a0b1\u6301\u6709\u8bfb\u9501\u65f6\uff0c\u7ebf\u7a0b2\u5c1d\u8bd5\u83b7\u53d6\u5199\u9501\u800c\u5904\u4e8e\u7b49\u5f85\u72b6\u6001\u3002\u7531\u4e8e\u5199\u8005\u4f18\u5148\u7ea7\u9ad8\u4e8e\u8bfb\u8005\uff0c\u56e0\u6b64\u7ebf\u7a0b3\u5373\u4f7f\u5c1d\u8bd5\u83b7\u53d6\u8bfb\u9501\u4e5f\u4f1a\u5904\u4e8e\u7b49\u5f85\u72b6\u6001\uff0c\u76f4\u5230\u5199\u9501\u88ab\u91ca\u653e\u3002\u8fd9\u4fdd\u8bc1\u4e86\u5728\u9700\u8981\u4fee\u6539\u5171\u4eab\u6570\u636e\u65f6\uff0c\u5199\u8005\u4f18\u5148\u7ea7\u6700\u9ad8\uff0c\u800c\u540e\u7eed\u8bfb\u8005\u9700\u8981\u7b49\u5f85\u5199\u9501\u91ca\u653e\u540e\u624d\u80fd\u83b7\u53d6\u8bfb\u9501\u3002<\/p>\n

\u56e0\u6b64\uff0c\u5373\u4f7f\u662f\u4e00\u4e2a\u8bfb\u5199\u9501\uff0c\u5728\u7279\u5b9a\u6761\u4ef6\u4e0b\u4e5f\u53ef\u80fd\u4f1a\u8868\u73b0\u51fa\u7c7b\u4f3c\u4e8e\u4e92\u65a5\u9501\u7684\u884c\u4e3a\uff0c\u4ee5\u4fdd\u8bc1\u5bf9\u5171\u4eab\u8d44\u6e90\u64cd\u4f5c\u7684\u6b63\u786e\u6027\u548c\u4e00\u81f4\u6027\u3002<\/p>\n

2.4anon_vma->rwsem  <\/h3>\n

Linux\u5185\u6838\u5185\u5b58\u7d27\u5f20\u65f6\u4f1a\u8fdb\u884c\u5185\u5b58\u56de\u6536\u3002\u5185\u5b58\u56de\u6536\u901a\u8fc7\u53cd\u5411\u6620\u5c04rmap\u673a\u5236\u627e\u5230page\u6240\u6709\u6620\u5c04\u7684vma\u5e76\u8fdb\u884c\u89e3\u9664\u6620\u5c04\u3002\u5bf9\u533f\u540d\u9875\u800c\u8a00\uff0cpage\u627e\u5230vma\u7684\u8def\u5f84\u4e00\u822c\u5982\u4e0b\uff1apage->av\uff08anon_vma\uff09->avc(anon_vma_chain)->vma\uff0c\u5176\u4e2davc\u8d77\u5230\u6865\u6881\u4f5c\u7528\u3002<\/p>\n

anon_vma\u7b80\u79f0av, \u7528\u4e8e\u7ba1\u7406\u533f\u540d\u9875vma,  \u5f53\u533f\u540d\u9875\u9700\u8981\u89e3\u6620\u5c04\u65f6\u9700\u8981\u5148\u627e\u5230av\uff0c\u518d\u901a\u8fc7av\u8fdb\u884c\u67e5\u627e\u5904\u7406\u3002struct anon_vma_chain\uff0c\u7b80\u79f0avc\u3002\u4e3b\u8981\u7528\u4e8e\u94fe\u63a5vma\u548cav\u3002<\/p>\n

\u8fd9\u51e0\u4e2a\u91cd\u8981\u6570\u636e\u7ed3\u6784\u7684\u5173\u7cfb\u5982\u4e0b\u56fe\uff1a    <\/p>\n

\"67a55131641f19d3f9dae5201dd6d8d6.jpeg\"<\/p>\n

anon_vma\u5b9a\u4e49\u4e86\u4e00\u7ec4\u7ea2\u9ed1\u6811\uff0cvma\u4e2d\u6570\u636e\u7ed3\u6784\u7ef4\u62a4\u4e86avc,\u5f53\u9700\u8981\u8bbf\u95eeav\u4e2d\u7684\u7ea2\u9ed1\u6811\u6570\u636e\u548cvma\u4e2d\u7684avc\u65f6\uff0c\u9700\u8981\u9501\u4fdd\u62a4\u3002<\/p>\n

anon_vma->rwsem\u662f\u5b9a\u4e49\u5728anon vma\u6570\u636e\u7ed3\u6784\u4e2d\u7684\u8bfb\u5199\u4fe1\u53f7\u91cf\u3002<\/p>\n\n\n\n
\n

struct anon_vma {\n <\/p>\n

       struct anon_vma *root;              \/* Root of this anon_vma tree *\/<\/p>\n

       <\/span>struct rw_semaphore rwsem;       \/* W: modification, R: walking the list *\/<\/span><\/p>\n

\u2026<\/p>\n

}<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u83b7\u53d6\u9501\u7684\u63a5\u53e3\u4e3b\u8981\u662fanon_vma_lock_write\u548canon_vma_lock_read\u3002\u5f53\u7136\u4e5f\u6709\u5e26try\u7c7b\u578b\u7684\u3002\u8fd9\u91cc\u4e0d\u8d58\u8ff0\u3002<\/p>\n\n\n\n
\n

static inline void __sched __down_write(struct rw_semaphore *sem)<\/p>\n

{\n <\/p>\n

       rwbase_write_lock(&sem->rwbase, TASK_UNINTERRUPTI<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

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