\u9875\u7f13\u5b58\u662fLinux\u5185\u6838\u4e00\u79cd\u91cd\u8981\u7684\u78c1\u76d8\u9ad8\u901f\u7f13\u5b58\uff0c\u5b83\u901a\u8fc7\u8f6f\u4ef6\u673a\u5236\u5b9e\u73b0\u3002\u4f46\u9875\u7f13\u5b58\u548c\u786c\u4ef6cache\u7684\u539f\u7406\u57fa\u672c\u76f8\u540c\uff0c\u5c06\u5bb9\u91cf\u5927\u800c\u4f4e\u901f\u8bbe\u5907\u4e2d\u7684\u90e8\u5206\u6570\u636e\u5b58\u653e\u5230\u5bb9\u91cf\u5c0f\u800c\u5feb\u901f\u7684\u8bbe\u5907\u4e2d\uff0c\u8fd9\u6837\u901f\u5ea6\u5feb\u7684\u8bbe\u5907\u5c06\u4f5c\u4e3a\u4f4e\u901f\u8bbe\u5907\u7684\u7f13\u5b58\uff0c\u5f53\u8bbf\u95ee\u4f4e\u901f\u8bbe\u5907\u4e2d\u7684\u6570\u636e\u65f6\uff0c\u53ef\u4ee5\u76f4\u63a5\u4ece\u7f13\u5b58\u4e2d\u83b7\u53d6\u6570\u636e\u800c\u4e0d\u9700\u518d\u8bbf\u95ee\u4f4e\u901f\u8bbe\u5907\uff0c\u4ece\u800c\u8282\u7701\u4e86\u6574\u4f53\u7684\u8bbf\u95ee\u65f6\u95f4\u3002<\/p>\n
\u9875\u7f13\u5b58\u4ee5\u9875\u4e3a\u5927\u5c0f\u8fdb\u884c\u6570\u636e\u7f13\u5b58\uff0c\u5b83\u5c06\u78c1\u76d8\u4e2d\u6700\u5e38\u7528\u548c\u6700\u91cd\u8981\u7684\u6570\u636e\u5b58\u653e\u5230\u90e8\u5206\u7269\u7406\u5185\u5b58\u4e2d\uff0c\u4f7f\u5f97\u7cfb\u7edf\u8bbf\u95ee\u5757\u8bbe\u5907\u65f6\u53ef\u4ee5\u76f4\u63a5\u4ece\u4e3b\u5b58\u4e2d\u83b7\u53d6\u5757\u8bbe\u5907\u6570\u636e\uff0c\u800c\u4e0d\u9700\u4ece\u78c1\u76d8\u4e2d\u83b7\u53d6\u6570\u636e\u3002<\/p>\n
\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u5185\u6838\u5728\u8bfb\u5199\u78c1\u76d8\u65f6\u90fd\u4f1a\u4f7f\u7528\u9875\u7f13\u5b58\u3002\u5185\u6838\u5728\u8bfb\u6587\u4ef6\u65f6\uff0c\u9996\u5148\u5728\u5df2\u6709\u7684\u9875\u7f13\u5b58\u4e2d\u67e5\u627e\u6240\u8bfb\u53d6\u7684\u6570\u636e\u662f\u5426\u5df2\u7ecf\u5b58\u5728\u3002\u5982\u679c\u8be5\u9875\u7f13\u5b58\u4e0d\u5b58\u5728\uff0c\u5219\u4e00\u4e2a\u65b0\u7684\u9875\u5c06\u88ab\u6dfb\u52a0\u5230\u9ad8\u901f\u7f13\u5b58\u4e2d\uff0c\u7136\u540e\u7528\u4ece\u78c1\u76d8\u8bfb\u53d6\u7684\u6570\u636e\u586b\u5145\u5b83\u3002\u5982\u679c\u5f53\u524d\u7269\u7406\u5185\u5b58\u8db3\u591f\u7a7a\u95f2\uff0c\u90a3\u4e48\u8be5\u9875\u5c06\u957f\u671f\u4fdd\u7559\u5728\u9ad8\u901f\u7f13\u5b58\u4e2d\uff0c\u4f7f\u5f97\u5176\u4ed6\u8fdb\u7a0b\u518d\u4f7f\u7528\u8be5\u9875\u4e2d\u7684\u6570\u636e\u65f6\u4e0d\u518d\u8bbf\u95ee\u78c1\u76d8\u3002\u5199\u64cd\u4f5c\u4e0e\u8bfb\u64cd\u4f5c\u65f6\u7c7b\u4f3c\uff0c\u76f4\u63a5\u5728\u9875\u7f13\u5b58\u4e2d\u4fee\u6539\u6570\u636e\uff0c\u4f46\u662f\u9875\u7f13\u5b58\u4e2d\u4fee\u6539\u7684\u6570\u636e\uff08\u8be5\u9875\u6b64\u65f6\u88ab\u79f0\u4e3aDirty Page\uff09\u5e76\u4e0d\u662f\u9a6c\u4e0a\u5c31\u88ab\u5199\u5165\u78c1\u76d8\uff0c\u800c\u662f\u5ef6\u8fdf\u51e0\u79d2\u949f\uff0c\u4ee5\u9632\u6b62\u8fdb\u7a0b\u5bf9\u8be5\u9875\u7f13\u5b58\u4e2d\u7684\u6570\u636e\u518d\u6b21\u4fee\u6539\u3002<\/p>\n
\u9875\u7f13\u5b58\u7684\u8bbe\u8ba1\u9700\u6c42<\/strong><\/p>\n \u9875\u7f13\u5b58\u81f3\u5c11\u9700\u8981\u6ee1\u8db3\u4ee5\u4e0b\u4e24\u79cd\u9700\u6c42\u3002\u9996\u5148\uff0c\u5b83\u5fc5\u987b\u53ef\u4ee5\u5feb\u901f\u5b9a\u4f4d\u542b\u6709\u7ed9\u5b9a\u6570\u636e\u7684\u7279\u5b9a\u9875\u3002\u5176\u6b21\uff0c\u7531\u4e8e\u9875\u9ad8\u901f\u7f13\u5b58\u4e2d\u7684\u6570\u636e\u6765\u6e90\u4e0d\u540c\uff0c\u6bd4\u5982\u666e\u901a\u6587\u4ef6\u3001\u5757\u8bbe\u5907\u7b49\uff0c\u5185\u6838\u5fc5\u987b\u6839\u636e\u4e0d\u540c\u7684\u6570\u636e\u6765\u6e90\u6765\u9009\u62e9\u5bf9\u9875\u7f13\u5b58\u7684\u9002\u5f53\u64cd\u4f5c\u3002<\/p>\n \u5185\u6838\u901a\u8fc7\u62bd\u8c61\u51faaddress_space\u6570\u636e\u7ed3\u6784\u6765\u6ee1\u8db3\u4e0a\u8ff0\u4e24\u79cd\u8bbe\u8ba1\u9700\u6c42\u3002<\/p>\n address_space\u7ed3\u6784<\/strong><\/p>\n <\/strong>address_space\u7ed3\u6784\u662f\u9875\u9ad8\u901f\u7f13\u5b58\u673a\u5236\u4e2d\u7684\u6838\u5fc3\u6570\u636e\u7ed3\u6784\uff0c\u8be5\u7ed3\u6784\u5e76\u4e0d\u662f\u5bf9\u67d0\u4e00\u4e2a\u9875\u9ad8\u901f\u7f13\u5b58\u8fdb\u884c\u63cf\u8ff0\uff0c\u800c\u662f\u4ee5\u9875\u9ad8\u901f\u7f13\u5b58\u7684\u6240\u6709\u8005\uff08owner\uff09\u4e3a\u5355\u4f4d\uff0c\u5bf9\u5176\u6240\u62e5\u6709\u7684\u7f13\u5b58\u8fdb\u884c\u62bd\u8c61\u63cf\u8ff0\u3002\u9875\u9ad8\u901f\u7f13\u5b58\u4e2d\u6bcf\u4e2a\u9875\u5305\u542b\u7684\u6570\u636e\u80af\u5b9a\u5c5e\u4e8e\u67d0\u4e2a\u6587\u4ef6\uff0c\u8be5\u6587\u4ef6\u5bf9\u5e94\u7684inode\u5bf9\u8c61\u5c31\u79f0\u4e3a\u9875\u9ad8\u901f\u7f13\u5b58\u7684\u6240\u6709\u8005\u3002<\/p>\n \u9875\u7f13\u5b58\u4e0e\u6587\u4ef6\u7cfb\u7edf\u548c\u5185\u5b58\u7ba1\u7406\u90fd\u6709\u8054\u7cfb\u3002\u6bcf\u4e2ainode\u7ed3\u6784\u4e2d\u90fd\u5d4c\u5957\u4e00\u4e2aaddress_space\u7ed3\u6784\uff0c\u5373inode\u5b57\u6bb5\u4e2d\u7684i_data\uff1b\u540c\u65f6inode\u4e2d\u8fd8\u6709i_maping\u5b57\u6bb5\u6307\u5411\u6240\u5d4c\u5957address_spaces\u7ed3\u6784\u3002\u800caddress_space\u7ed3\u6784\u901a\u8fc7host\u5b57\u6bb5\u53cd\u6307\u5411\u9875\u9ad8\u901f\u7f13\u5b58\u7684\u6240\u6709\u8005\u3002\u9875\u7f13\u5b58\u7684\u672c\u8d28\u5c31\u662f\u4e00\u4e2a\u7269\u7406\u9875\u6846\uff0c\u56e0\u6b64\u6bcf\u4e2a\u9875\u63cf\u8ff0\u7b26\u4e2d\u901a\u8fc7mmaping\u548cindex\u4e24\u4e2a\u5b57\u6bb5\u4e0e\u9ad8\u901f\u7f13\u5b58\u8fdb\u884c\u5173\u8054\u3002mmaping\u6307\u5411\u9875\u7f13\u5b58\u6240\u6709\u8005\u4e2d\u7684address_space\u5bf9\u8c61\u3002index\u8868\u793a\u4ee5\u9875\u5927\u5c0f\u4e3a\u5355\u4f4d\u7684\u504f\u79fb\u91cf\uff0c\u8be5\u504f\u79fb\u91cf\u8868\u793a\u9875\u6846\u5185\u6570\u636e\u5728\u78c1\u76d8\u6587\u4ef6\u4e2d\u7684\u504f\u79fb\u91cf\u3002<\/p>\n address_space\u7ed3\u6784\u4e2d\u7684i_mmap\u5b57\u6bb5\u6307\u5411\u4e00\u4e2aradix\u4f18\u5148\u641c\u7d22\u6811\u3002\u8be5\u6811\u5c06\u4e00\u4e2a\u6587\u4ef6\u6240\u6709\u8005\u4e2d\u7684\u6240\u6709\u9875\u7f13\u5b58\u7ec4\u7ec7\u5728\u4e00\u8d77\uff0c\u8fd9\u6837\u53ef\u4ee5\u5feb\u901f\u641c\u7d22\u5230\u6307\u5b9a\u7684\u9875\u7f13\u5b58\u3002\u5185\u6838\u4e2d\u5173\u4e8eradix\u6811\u6709\u4e00\u5957\u6807\u51c6\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u5b83\u4e0d\u4e0e\u7279\u5b9a\u7684\u6570\u636e\u8054\u7cfb\uff08\u4e0e\u5185\u6838\u53cc\u8054\u8868\u7c7b\u4f3c\uff09\uff0c\u8fd9\u6837\u4f7f\u5f97\u4f7f\u7528\u8303\u56f4\u66f4\u52a0\u7075\u6d3b\u3002\u5177\u4f53\u64cd\u4f5c\u5982\u4e0b\uff1a<\/p>\n radix_tree_lookup():\u5728radix\u6811\u4e2d\u5bf9\u6307\u5b9a\u8282\u70b9\u8fdb\u884c\u67e5\u627e\uff1b<\/p>\n radix_tree_insert():\u5728radix\u6811\u4e2d\u63d2\u5165\u65b0\u8282\u70b9\uff1b<\/p>\n radix_tree_delete():\u5728radix\u6811\u4e2d\u5220\u9664\u6307\u5b9a\u8282\u70b9\uff1b<\/p>\n \u6b64\u5916\uff0c\u8be5\u7ed3\u6784\u4e2d\u7684a_ops\u5b57\u6bb5\u6307\u5411address_space_operations\u7ed3\u6784\uff0c\u8be5\u7ed3\u6784\u662f\u4e00\u4e2a\u94a9\u5b50\u51fd\u6570\u96c6\uff0c\u5b83\u8868\u660e\u4e86\u5bf9\u6240\u6709\u8005\u7684\u9875\u8fdb\u884c\u64cd\u4f5c\u7684\u6807\u51c6\u65b9\u6cd5\u3002\u6bd4\u5982writepage\u94a9\u5b50\u51fd\u6570\u8868\u793a\u5c06\u9875\u4e2d\u7684\u6570\u636e\u5199\u5165\u5230\u78c1\u76d8\u4e2d\uff0creadpage\u8868\u793a\u4ece\u78c1\u76d8\u6587\u4ef6\u4e2d\u8bfb\u6570\u636e\u5230\u9875\u4e2d\u3002\u901a\u5e38\uff0c\u8fd9\u4e9b\u94a9\u5b50\u51fd\u6570\u5c06\u9875\u7f13\u5b58\u7684\u6240\u6709\u8005\uff08inode\uff09\u548c\u8bbf\u95ee\u7269\u7406\u8bbe\u5907\u7684\u4f4e\u7ea7\u9a71\u52a8\u7a0b\u5e8f\u5173\u8054\u8d77\u6765\u3002\u8be5\u51fd\u6570\u96c6\u4f7f\u5f97\u5185\u6838\u5728\u4e0a\u5c42\u4f7f\u7528\u7edf\u4e00\u7684\u63a5\u53e3\u4e0e\u9875\u7f13\u5b58\u8fdb\u884c\u4ea4\u4e92\uff0c\u800c\u5e95\u5c42\u5219\u6839\u636e\u9875\u7f13\u5b58\u4e2d\u6570\u636e\u7684\u6765\u6e90\u5177\u4f53\u5b9e\u73b0\u3002<\/p>\n \u901a\u8fc7\u4e0a\u9762\u7684\u63cf\u8ff0\uff0c\u53ef\u4ee5\u770b\u5230address_space\u7ed3\u6784\u4e2d\u7684\u4f18\u5148\u641c\u7d22\u6811\u548c\u94a9\u5b50\u51fd\u6570\u96c6\u89e3\u51b3\u4e86\u9875\u9ad8\u901f\u7f13\u5b58\u7684\u4e24\u4e2a\u4e3b\u8981\u8bbe\u8ba1\u9700\u6c42\u3002<\/p>\n \u5185\u6838\u5bf9\u9875\u7f13\u5b58\u7684\u64cd\u4f5c\u51fd\u6570<\/strong><\/p>\n \u5185\u6838\u5bf9\u9875\u7f13\u5b58\u7684\u57fa\u672c\u64cd\u4f5c\u5305\u542b\u4e86\u5728\u4e00\u4e2a\u9875\u7f13\u5b58\u6240\u5f62\u6210\u7684radix\u6811\u4e2d\u67e5\u627e\uff0c\u589e\u52a0\u548c\u5220\u9664\u4e00\u4e2a\u9875\u7f13\u5b58\u3002\u57fa\u4e8eradix\u7684\u57fa\u672c\u64cd\u4f5c\u51fd\u6570\uff0c\u9875\u9ad8\u901f\u7f13\u5b58\u7684\u5904\u7406\u51fd\u6570\u5982\u4e0b\uff1a<\/p>\n page_cache_alloc()\uff1a\u5206\u914d\u4e00\u4e2a\u65b0\u7684\u9875\u7f13\u5b58\uff1b<\/p>\n find_get_page()\uff1a\u5728\u9875\u9ad8\u901f\u7f13\u5b58\u4e2d\u67e5\u627e\u6307\u5b9a\u9875\uff1b<\/p>\n add_to_page_cache()\uff1a\u628a\u4e00\u4e2a\u65b0\u9875\u6dfb\u52a0\u5230\u9875\u9ad8\u901f\u7f13\u5b58\uff1b<\/p>\n remove_from_page_cache()\uff1a\u5c06\u6307\u5b9a\u9875\u4ece\u9875\u9ad8\u901f\u7f13\u5b58\u4e2d\u79fb\u9664\uff1b<\/p>\n read_cache_page()\uff1a\u786e\u4fdd\u6307\u5b9a\u9875\u5728\u9875\u9ad8\u901f\u7f13\u5b58\u4e2d\u5305\u542b\u6700\u65b0\u7684\u6570\u636e\uff1b<\/p>\n \u53c2\u8003\uff1a<\/p>\n 1. \u6df1\u5165\u7406\u89e3Linux\u5185\u6838 \u7b2c\u4e09\u7248<\/p>\n 2.\u6df1\u5165Linux\u5185\u6838\u67b6\u6784<\/p>\n","protected":false},"excerpt":{"rendered":" \u9875\u7f13\u5b58\u662fLinux\u5185\u6838\u4e00\u79cd\u91cd\u8981\u7684\u78c1\u76d8\u9ad8\u901f\u7f13\u5b58\uff0c\u5b83\u901a\u8fc7\u8f6f\u4ef6\u673a\u5236\u5b9e\u73b0\u3002\u4f46\u9875\u7f13\u5b58\u548c\u786c\u4ef6cache\u7684\u539f\u7406\u57fa\u672c\u76f8\u540c\uff0c\u5c06\u5bb9 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[110,175],"tags":[361,360,359],"class_list":["post-4217","post","type-post","status-publish","format-standard","hentry","category-linux","category-175","tag-cache","tag-360","tag-359"],"views":11889,"_links":{"self":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/4217","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/comments?post=4217"}],"version-history":[{"count":0,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/4217\/revisions"}],"wp:attachment":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/media?parent=4217"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/categories?post=4217"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/tags?post=4217"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}