{"id":51587,"date":"2024-12-03T14:01:49","date_gmt":"2024-12-03T06:01:49","guid":{"rendered":"https:\/\/fwq.ai\/blog\/51587\/"},"modified":"2024-12-03T14:01:49","modified_gmt":"2024-12-03T06:01:49","slug":"linux%e5%86%85%e6%a0%b8%e6%ba%90%e4%bb%a3%e7%a0%81%e6%96%87%e4%bb%b6%e8%b7%af%e5%be%84%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/51587\/","title":{"rendered":"Linux\u5185\u6838\u6e90\u4ee3\u7801\u6587\u4ef6\u8def\u5f84\u8be6\u89e3"},"content":{"rendered":"

<\/b> <\/p>\n

Linux\u5185\u6838\u6e90\u4ee3\u7801\u6587\u4ef6\u8def\u5f84\u8be6\u89e3<\/h1>\n

\u4eb2\u7231\u7684\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5982\u679c\u4f60\u70b9\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\uff0c\u8bf4\u660e\u4f60\u5bf9\u300aLinux\u5185\u6838\u6e90\u4ee3\u7801\u6587\u4ef6\u8def\u5f84\u8be6\u89e3\u300b\u5f88\u611f\u5174\u8da3\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u7ed9\u5927\u5bb6\u8be6\u7ec6\u89e3\u6790\u4e00\u4e0b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u6240\u6709\u8ba4\u771f\u8bfb\u5b8c\u7684\u7ae5\u978b\u4eec\uff0c\u90fd\u6709\u5b9e\u8d28\u6027\u7684\u63d0\u9ad8\u3002<\/p>\n

\u63a2\u5bfbLinux\u5185\u6838\u6e90\u4ee3\u7801\u6240\u5728\u6587\u4ef6\u8be6\u89e3<\/p>\n

Linux\u4f5c\u4e3a\u4e00\u6b3e\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edf\uff0c\u5176\u5185\u6838\u6e90\u4ee3\u7801\u4f5c\u4e3a\u5176\u8bbe\u8ba1\u4e0e\u529f\u80fd\u7684\u6838\u5fc3\u90e8\u5206\uff0c\u88ab\u5e7f\u6cdb\u7814\u7a76\u548c\u4f7f\u7528\u3002Linux\u5185\u6838\u6e90\u4ee3\u7801\u5305\u542b\u4e86\u8bb8\u591a\u6587\u4ef6\uff0c\u6bcf\u4e2a\u6587\u4ef6\u8d1f\u8d23\u4e0d\u540c\u7684\u529f\u80fd\u6a21\u5757\u3002\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u5c06\u6df1\u5165\u63a2\u5bfbLinux\u5185\u6838\u6e90\u4ee3\u7801\u4e2d\u51e0\u4e2a\u5173\u952e\u6587\u4ef6\u7684\u4f5c\u7528\u548c\u5177\u4f53\u4ee3\u7801\u793a\u4f8b\uff0c\u5e2e\u52a9\u8bfb\u8005\u66f4\u597d\u5730\u7406\u89e3Linux\u5185\u6838\u7684\u8bbe\u8ba1\u548c\u8fd0\u884c\u3002<\/p>\n

    \n
  1. kernel\/sched\/core.c<\/strong> – \u8fd9\u4e2a\u6587\u4ef6\u5b9e\u73b0\u4e86Linux\u5185\u6838\u4e2d\u7684\u8c03\u5ea6\u5668\u3002\u8c03\u5ea6\u5668\u8d1f\u8d23\u51b3\u5b9a\u54ea\u4e2a\u8fdb\u7a0b\u5728\u4ec0\u4e48\u65f6\u5019\u6267\u884c\uff0c\u4ee5\u5b9e\u73b0\u65f6\u95f4\u7247\u8f6e\u8f6c\u3001\u4f18\u5148\u7ea7\u8c03\u5ea6\u7b49\u529f\u80fd\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4ee3\u7801\u793a\u4f8b\uff1a<\/li>\n<\/ol>\n
    #include <linux\/sched.h>\n#include <linux\/sched\/signal.h>\n\nvoid schedule(void)\n{\n    struct task_struct *prev, *next;\n\n    prev = current;\n    \n    next = pick_next_task(); \/\/ \u9009\u62e9\u4e0b\u4e00\u4e2a\u8981\u8fd0\u884c\u7684\u8fdb\u7a0b\n\n    switch_to(next); \/\/ \u5207\u6362\u5230\u4e0b\u4e00\u4e2a\u8fdb\u7a0b\u6267\u884c\n}<\/pre>\n
      \n
    1. kernel\/slab.c<\/strong> – \u8fd9\u4e2a\u6587\u4ef6\u5b9e\u73b0\u4e86Linux\u5185\u6838\u4e2d\u7684Slab\u5206\u914d\u5668\u3002Slab\u5206\u914d\u5668\u7528\u4e8e\u9ad8\u6548\u5730\u5206\u914d\u548c\u56de\u6536\u5185\u5b58\uff0c\u63d0\u9ad8\u7cfb\u7edf\u7684\u6027\u80fd\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4ee3\u7801\u793a\u4f8b\uff1a<\/li>\n<\/ol>\n
      #include <linux\/slab.h>\n\nvoid *kmalloc(size_t size, gfp_t flags)\n{\n    struct kmem_cache *cache;\n    void *ptr;\n\n    cache = get_cache_for_size(size); \/\/ \u6839\u636e\u5206\u914d\u5927\u5c0f\u83b7\u53d6\u5408\u9002\u7684\u7f13\u5b58\n    ptr = alloc_slab(cache); \/\/ \u4ece\u7f13\u5b58\u4e2d\u5206\u914d\u5185\u5b58\n\n    return ptr;\n}<\/pre>\n
        \n
      1. kernel\/fs\/namei.c<\/strong> – \u8fd9\u4e2a\u6587\u4ef6\u5b9e\u73b0\u4e86Linux\u5185\u6838\u4e2d\u7684\u8def\u5f84\u89e3\u6790\u548c\u6587\u4ef6\u7cfb\u7edf\u64cd\u4f5c\u3002\u8def\u5f84\u89e3\u6790\u7528\u4e8e\u5c06\u7528\u6237\u6001\u4f20\u5165\u7684\u6587\u4ef6\u8def\u5f84\u8f6c\u6362\u6210\u5185\u6838\u4e2d\u7684inode\uff0c\u8fdb\u884c\u6587\u4ef6\u64cd\u4f5c\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4ee3\u7801\u793a\u4f8b\uff1a<\/li>\n<\/ol>\n
        #include <linux\/fs.h>\n#include <linux\/path.h>\n\nint vfs_open(const char *pathname, int flags, int mode)\n{\n    struct path path;\n    struct file *file;\n    \n    int err = kern_path(pathname, LOOKUP_FOLLOW, &path);\n\n    if (!err)\n    {\n        file = filp_open(&path, flags, mode);\n        if (IS_ERR(file))\n        {\n            err = PTR_ERR(file);\n        }\n    }\n    \n    return err;\n}<\/pre>\n
        \u901a\u8fc7\u5bf9\u4ee5\u4e0a\u51e0\u4e2a\u5173\u952e\u6587\u4ef6\u7684\u4ee3\u7801\u793a\u4f8b\u8fdb\u884c\u5206\u6790\uff0c\u8bfb\u8005\u53ef\u4ee5\u66f4\u52a0\u6df1\u5165\u5730\u4e86\u89e3Linux\u5185\u6838\u6e90\u4ee3\u7801\u7684\u7ed3\u6784\u548c\u529f\u80fd\u3002\u9664\u4e86\u8fd9\u4e9b\u6587\u4ef6\u4e4b\u5916\uff0cLinux\u5185\u6838\u8fd8\u5305\u542b\u4e86\u8bb8\u591a\u5176\u4ed6\u91cd\u8981\u7684\u6587\u4ef6\uff0c\u6db5\u76d6\u4e86\u8fdb\u7a0b\u7ba1\u7406\u3001\u5185\u5b58\u7ba1\u7406\u3001\u6587\u4ef6\u7cfb\u7edf\u7b49\u65b9\u9762\u7684\u5b9e\u73b0\u3002\u8fdb\u4e00\u6b65\u7814\u7a76\u548c\u63a2\u7d22Linux\u5185\u6838\u6e90\u4ee3\u7801\uff0c\u6709\u52a9\u4e8e\u7406\u89e3\u64cd\u4f5c\u7cfb\u7edf\u7684\u8bbe\u8ba1\u539f\u7406\u548c\u5185\u90e8\u5de5\u4f5c\u673a\u5236\uff0c\u63d0\u5347\u7cfb\u7edf\u7f16\u7a0b\u7684\u80fd\u529b\u548c\u6c34\u5e73\u3002<\/p>\n
        \u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300aLinux\u5185\u6838\u6e90\u4ee3\u7801\u6587\u4ef6\u8def\u5f84\u8be6\u89e3\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6587\u7ae0\u77e5\u8bc6\uff01<\/p>\n
        \n
        <\/dt>\n
        \n   \u4e3a\u4ec0\u4e48\u51fa\u73b0\u7ade\u4e89\u6761\u4ef6\uff1f\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
        Linux\u5185\u6838\u6e90\u4ee3\u7801\u6587\u4ef6\u8def\u5f84\u8be6\u89e3 \u4eb2\u7231\u7684\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5982\u679c\u4f60\u70b9\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\uff0c\u8bf4\u660e\u4f60\u5bf9\u300aLinux\u5185\u6838\u6e90\u4ee3\u7801\u6587\u4ef6\u8def\u5f84\u8be6\u89e3\u300b\u5f88\u611f\u5174\u8da3\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u7ed9\u5927\u5bb6\u8be6\u7ec6\u89e3\u6790\u4e00\u4e0b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u6240\u6709\u8ba4\u771f\u8bfb\u5b8c\u7684\u7ae5\u978b\u4eec\uff0c\u90fd\u6709\u5b9e\u8d28\u6027\u7684\u63d0\u9ad8\u3002 \u63a2\u5bfbLinux\u5185\u6838\u6e90\u4ee3\u7801\u6240\u5728\u6587\u4ef6\u8be6\u89e3 Linux\u4f5c\u4e3a\u4e00\u6b3e\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edf\uff0c\u5176\u5185\u6838\u6e90\u4ee3\u7801\u4f5c\u4e3a\u5176\u8bbe\u8ba1\u4e0e\u529f\u80fd\u7684\u6838\u5fc3\u90e8\u5206\uff0c\u88ab\u5e7f\u6cdb\u7814\u7a76\u548c\u4f7f\u7528\u3002Linux\u5185\u6838\u6e90\u4ee3\u7801\u5305\u542b\u4e86\u8bb8\u591a\u6587\u4ef6\uff0c\u6bcf\u4e2a\u6587\u4ef6\u8d1f\u8d23\u4e0d\u540c\u7684\u529f\u80fd\u6a21\u5757\u3002\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u5c06\u6df1\u5165\u63a2\u5bfbLinux\u5185\u6838\u6e90\u4ee3\u7801\u4e2d\u51e0\u4e2a\u5173\u952e\u6587\u4ef6\u7684\u4f5c\u7528\u548c\u5177\u4f53\u4ee3\u7801\u793a\u4f8b\uff0c\u5e2e\u52a9\u8bfb\u8005\u66f4\u597d\u5730\u7406\u89e3Linux\u5185\u6838\u7684\u8bbe\u8ba1\u548c\u8fd0\u884c\u3002 kernel\/sched\/core.c – \u8fd9\u4e2a\u6587\u4ef6\u5b9e\u73b0\u4e86Linux\u5185\u6838\u4e2d\u7684\u8c03\u5ea6\u5668\u3002\u8c03\u5ea6\u5668\u8d1f\u8d23\u51b3\u5b9a\u54ea\u4e2a\u8fdb\u7a0b\u5728\u4ec0\u4e48\u65f6\u5019\u6267\u884c\uff0c\u4ee5\u5b9e\u73b0\u65f6\u95f4\u7247\u8f6e\u8f6c\u3001\u4f18\u5148\u7ea7\u8c03\u5ea6\u7b49\u529f\u80fd\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4ee3\u7801\u793a\u4f8b\uff1a #include <linux\/sched.h> #include <linux\/sched\/signal.h> void schedule(void) { struct task_struct *prev, *next; prev = current; next = pick_next_task(); \/\/ \u9009\u62e9\u4e0b\u4e00\u4e2a\u8981\u8fd0\u884c\u7684\u8fdb\u7a0b switch_to(next); \/\/ \u5207\u6362\u5230\u4e0b\u4e00\u4e2a\u8fdb\u7a0b\u6267\u884c } kernel\/slab.c – \u8fd9\u4e2a\u6587\u4ef6\u5b9e\u73b0\u4e86Linux\u5185\u6838\u4e2d\u7684Slab\u5206\u914d\u5668\u3002Slab\u5206\u914d\u5668\u7528\u4e8e\u9ad8\u6548\u5730\u5206\u914d\u548c\u56de\u6536\u5185\u5b58\uff0c\u63d0\u9ad8\u7cfb\u7edf\u7684\u6027\u80fd\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4ee3\u7801\u793a\u4f8b\uff1a #include <linux\/slab.h> void *kmalloc(size_t size, gfp_t flags) { struct kmem_cache *cache; void *ptr; cache = get_cache_for_size(size); \/\/ \u6839\u636e\u5206\u914d\u5927\u5c0f\u83b7\u53d6\u5408\u9002\u7684\u7f13\u5b58 ptr = alloc_slab(cache); \/\/ […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-51587","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/51587","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=51587"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/51587\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=51587"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=51587"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=51587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}