{"id":2793,"date":"2011-02-23T22:33:30","date_gmt":"2011-02-23T14:33:30","guid":{"rendered":"http:\/\/www.orczhou.com\/?p=2793"},"modified":"2011-04-01T09:51:18","modified_gmt":"2011-04-01T01:51:18","slug":"linux-memory-management-3","status":"publish","type":"post","link":"https:\/\/www.orczhou.com\/index.php\/2011\/02\/linux-memory-management-3\/","title":{"rendered":"Linux\u5185\u5b58\u7ba1\u7406\u5b66\u4e60\u7b14\u8bb0&#8211;\u7269\u7406\u5185\u5b58\u5206\u914d"},"content":{"rendered":"<p>\u6bcf\u6b21\u6df1\u5165\u4e86\u89e3\u4e00\u4e2a\u6280\u672f\u95ee\u9898\uff0c\u968f\u7740\u6316\u636e\u7684\u6df1\u5165\uff0c\u90fd\u53d1\u73b0\u5176\u80cc\u540e\u603b\u975e\u5e38\u6df1\u7684\u80cc\u666f\u77e5\u8bc6\uff0c\u751a\u81f3\u9700\u8981\u6df1\u5165\u5230\u5f88\u591a\u5e95\u5c42\u7cfb\u7edf\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u6709\u65f6\u4f1a\u8ba9\u81ea\u5df1\u8ff7\u5931\uff0c\u4f1a\u8ba9\u81ea\u5df1\u5fd8\u4e86\u5f53\u521d\u7684\u76ee\u7684\u3002<\/p>\n<p>\u5728<a href=\"http:\/\/www.orczhou.com\/index.php\/2011\/02\/linux-memory-management-1\/\">\u524d\u7bc7<\/a>\u4e2d\u4ecb\u7ecd\u7cfb\u7edf\u542f\u52a8\u65f6\u5185\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\uff0c\u672c\u7bc7\u5c06\u4ecb\u7ecd\u7b80\u8981Linux\u5982\u4f55\u63a5\u7ba1\u4e3b\u673a\u7684\u7269\u7406\u5185\u5b58\u3001\u7ec4\u7ec7\u5185\u5b58\uff0c\u6700\u540e\u4f1a\u8f83\u4e3a\u8be6\u7ec6\u7684\u4ecb\u7ecdLinux\u5206\u914d\u5185\u5b58\u7684\u4e00\u6bb5\u4ee3\u7801\u3002<\/p>\n<p>\u524d\u9762\u8bf4\u4e86\uff0cLinux MM\u7cfb\u7edf\u7ec6\u8282\u975e\u5e38\u591a\uff0c\u81ea\u5df1\u5728\u63a2\u7a76\u7684\u65f6\u5019\uff0c\u4e5f\u662f\u5c1d\u8bd5\u5c3d\u91cf\u6293\u4f4f\u4e3b\u7ebf\uff0c\u8fd9\u91cc\u4e5f\u53ea\u80fd\u62bd\u53d6\u4e86\u4e00\u4e9b\u201c\u4e3b\u7ebf\u5267\u60c5\u201d\u4ecb\u7ecd\uff0c\u5176\u4e2d\u8fd8\u53ef\u4ee5\u6269\u5c55\u51fa\u5f88\u591a\u7ec6\u8282\uff0c\u770b\u5ba2\u611f\u5174\u8da3\u53ef\u4ee5\u81ea\u5df1\u6df1\u7a76\uff0c\u540e\u7eed\u5982\u679c\u5174\u8da3\u8fd8\u5728\uff0c\u6211\u4e5f\u8fd8\u4f1a\u7ee7\u7eed\u5199\u51fa\u6765\u3002\u5185\u6838\u7248\u672c\u5982\u679c\u6ca1\u6709\u7279\u522b\u8bf4\u660e\uff0c\u5c31\u662f\u4f7f\u75282.6.33\u7248\u672c\u3002<\/p>\n<div class=\"myt1\">1. \u7269\u7406\u5185\u5b58\u7ec4\u7ec7<\/div>\n<p>\u5148\u58f0\u660e\u4e00\u4e0b\uff0c\u8fd9\u91cc\u8bf4\u7684Linux\u90fd\u662f\u8fd0\u884cIntel X86\u67b6\u6784\u7684\u3002\u4ece80386\u5f00\u59cb\uff0c\u4e3a\u4e86\u66f4\u597d\u652f\u6301\u5185\u5b58\u7ba1\u7406\u3001\u865a\u62df\u5185\u5b58\u6280\u672f\uff0cx86\u67b6\u6784\u5f00\u59cb\u652f\u6301\u5904\u7406\u5668\u7684\u5206\u9875\u6a21\u5f0f\uff08\u5206\u9875\u662f\u57fa\u4e8e\u5206\u6bb5\uff09\u3002\u7cfb\u7edf\u5c06\u5185\u5b58\u5206\u4e3a\u4e00\u4e2a\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684\u5757\uff0c\u79f0\u4f5c\u201cpage frames\u201d\uff0cx86\u67b6\u6784\u6bcf\u4e00\u4e2a\u201cpage frames\u201d\u5927\u5c0f\u4e3a4096\u5b57\u8282\u3002Linux\u4e2d\u4f7f\u7528<a href=\"http:\/\/lxr.linux.no\/linux+v2.6.18\/include\/linux\/mm.h#L223\">struct page<\/a>\u7ed3\u6784\u6765\u63cf\u8ff0\u4e00\u4e2a\u201cpage frames\u201d\u3010\u94fe\u63a5\u4e2d\u7ed9\u51fa\u4e862.6.18\u5185\u6838\u4e0b\u7684Page\u7ed3\u6784\u3011\uff0c\u4e00\u4e2aPage\u7ed3\u6784\u5bf9\u5e94\u4e86\u4e00\u4e2a\u7269\u7406\u5185\u5b58\u9875\u3002<\/p>\n<p>\u5728Linux\u4e2d\uff0c\u6240\u6709\u7684struct page\u5bf9\u8c61\u90fd\u653e\u5728\u4e00\u4e2a\u6570\u7ec4mem_map\uff0cmem_map\u6bcf\u4e00\u4e2a\u5143\u7d20\u5bf9\u5e94\u4e00\u4e2aPage\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.orczhou.com\/wp-content\/uploads\/2011\/02\/Linux-mem_map.jpg\" alt=\"\" title=\"Linux-mem_map\" width=\"500\" height=\"305\" class=\"alignleft size-full wp-image-2849\" \/><\/p>\n<div class=\"myt1\">2. NUMA\u4e0b\u7684\u5185\u5b58\u7ed3\u6784<\/div>\n<p>\u5728NUMA\u67b6\u6784\u4e0b\uff0c\u7cfb\u7edf\u6839\u636eCPU\u7684\u7269\u7406\u9897\u6570\uff0c\u5c06\u5185\u5b58\u5206\u6210\u5bf9\u5e94\u7684Node\u3002\u4f8b\u5982\uff0c\u4e24\u9897\u7269\u7406CPU\uff0c16GB\u5185\u5b58\u7684\u786c\u4ef6\uff1a\u7cfb\u7edf\u5219\u5c06\u5185\u5b58\u5206\u6210\u4e24\u4e2a8GB\uff0c\u5206\u522b\u5206\u914d\u7ed9\u4e24\u9897CPU\uff1a<\/p>\n<div class=\"mycode\">my111.cm3:\/root>#numactl &#8211;hardware<br \/>\navailable: 2 nodes (0-1)<br \/>\nnode 0 size: 8065 MB<br \/>\nnode 1 size: 8080 MB\n<\/div>\n<p>\u6bcf\u4e00\u4e2aNode\uff0c\u7cfb\u7edf\u53c8\u5c06\u5176\u5206\u4e3a\u591a\u4e2aZone\uff0c<strong>64\u4f4d<\/strong>x86\u67b6\u6784\u4e0b\uff08\u53c2\u8003:8.1.5\uff09\uff0c\u5206\u4e3a\u4e24\u4e2aZONE_DMA\uff08\u4f4e16MB\uff0c\uff09\u3001ZONE_NORMAL\uff08\u5176\u4f59\u5185\u5b58\uff09\u3002\u6240\u4ee5NUMA\u67b6\u6784\u4e0b\u7684\u5185\u5b58\u5206\u914d\uff0c\u4e5f\u5c31\u662f\u5728\u5404\u4e2azone\u5206\u914d\u5185\u5b58\u3002<\/p>\n<div class=\"myt1\">3. \u5185\u5b58\u5206\u914d\u51fd\u6570\u6808<\/div>\n<p>\u4ece\u5e95\u5c42\u7cfb\u7edf\u7684\u89d2\u5ea6\uff0c\u5185\u5b58\u5206\u914d\u6709\u5982\u4e0b\u51fd\u6570\uff08\u8fd9\u91cc\u4ecb\u7ecd\u7684\u5e95\u5c42\u51fd\u6570\uff0c\u548c\u4e0a\u5c42\u51fd\u6570\u7684\u5173\u7cfb\uff0c\u4ee5\u540e\u518d\u4ecb\u7ecd\uff09\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.orczhou.com\/wp-content\/uploads\/2011\/02\/funcion-allocate.png\" alt=\"\" title=\"funcion-allocate\" width=\"619\" height=\"182\" class=\"alignleft size-full wp-image-2843\" srcset=\"https:\/\/www.orczhou.com\/wp-content\/uploads\/2011\/02\/funcion-allocate.png 619w, https:\/\/www.orczhou.com\/wp-content\/uploads\/2011\/02\/funcion-allocate-300x88.png 300w\" sizes=\"auto, (max-width: 619px) 100vw, 619px\" \/><\/p>\n<p>\u8fd9\u91cc\u6765\u8c03\u67e5\u4e00\u4e0b\u51fd\u6570alloc_pages\u90fd\u505a\u4e86\u4e9b\u4ec0\u4e48\uff0c\u90fd\u8c03\u7528\u4e86\u54ea\u4e9b\u51fd\u6570\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.orczhou.com\/wp-content\/uploads\/2011\/02\/function-stack1.png\" alt=\"\" title=\"function-stack\" width=\"616\" height=\"332\" class=\"alignleft size-full wp-image-2847\" srcset=\"https:\/\/www.orczhou.com\/wp-content\/uploads\/2011\/02\/function-stack1.png 616w, https:\/\/www.orczhou.com\/wp-content\/uploads\/2011\/02\/function-stack1-300x161.png 300w\" sizes=\"auto, (max-width: 616px) 100vw, 616px\" \/><\/p>\n<p>free_area\u662f\u4e00\u4e2a\u5e95\u5c42\u4fdd\u5b58\u7a7a\u95f2\u5185\u5b58\u9875\u7684\u6570\u7ec4\uff0c\u6709\u7740\u7279\u6b8a\u7684\u7ed3\u6784\uff0c\u5b83\u4e5f\u662f\u5185\u5b58\u5206\u914d<a href=\"http:\/\/www.google.com\/search?sclient=psy&#038;hl=en&#038;site=&#038;source=hp&#038;q=Linux+buddy+system&#038;btnG=Google+Search\">Buddy system<\/a>\u7684\u6838\u5fc3\u53d8\u91cf\u3002<\/p>\n<div class=\"myt1\">4. get_page_from_freelist\u548czone_reclaim_mode<\/div>\n<p>\u4e0a\u9762\u51fd\u6570get_page_from_freelist\u3010mm\/page_alloc.c\u3011\u901a\u8fc7\u904d\u5386\u7cfb\u7edf\u4e2d\u5404\u4e2azone\uff0c\u6765\u5bfb\u627e\u53ef\u7528\u5185\u5b58\uff0c\u6839\u636eLinux\u7cfb\u7edf\u4e2dzone_reclaim_mode\u7684\u8bbe\u7f6e\u4e0d\u540c\uff0c\u904d\u5386\u65f6\u7684\u884c\u4e3a\u7565\u6709\u4e0d\u540c\u3002zone_reclaim_mode\u662fLinux\u4e2d\u7684\u4e00\u4e2a\u53ef\u914d\u7f6e\u53c2\u6570\uff0c\u4e3a\u4e86\u89e3\u8be5\u53c2\u6570\u5982\u4f55\u5f71\u54cd\u5185\u5b58\u5206\u914d\uff0c\u90a3\u5c31\u6253\u5f00get_page_from_freelist\u7684\u4ee3\u7801\uff0c\u4ed4\u7ec6\u770b\u770b\u904d\u5386\u5404\u4e2azone\u7684\u6d41\u7a0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.orczhou.com\/wp-content\/uploads\/2011\/02\/Linux-mm-4.jpg\" alt=\"\" title=\"Linux-mm-4\" width=\"600\"  class=\"alignleft size-full wp-image-2798\" srcset=\"https:\/\/www.orczhou.com\/wp-content\/uploads\/2011\/02\/Linux-mm-4.jpg 687w, https:\/\/www.orczhou.com\/wp-content\/uploads\/2011\/02\/Linux-mm-4-300x286.jpg 300w\" sizes=\"(max-width: 687px) 100vw, 687px\" \/><\/p>\n<p>\u4e0a\u9762\u770b\u5230\uff0czone_reclaim_mode\u975e\u96f6\u65f6\uff0c\u5982\u679c\u67d0\u4e2azone\u5185\u5b58\u4e0d\u591f\uff0c\u5219\u4f1a\u5c1d\u8bd5\u51fa\u53d1\u4e00\u6b21\u5185\u5b58\u56de\u6536\u5de5\u4f5c\uff08zone_reclaim\uff09\uff0c\u7b49\u4e8e\u96f6\u65f6\uff0c\u5219\u76f4\u63a5\u5c1d\u8bd5\u5199\u4e00\u4e2azone\u3002<\/p>\n<p>\u4e0a\u9762\u662f2.6.33\u5185\u6838\u7684\u4ee3\u7801\u6d41\u7a0b\u56fe\uff0c2.6.18\uff08RHEL5.4\u7684\u5185\u6838\uff09\u4e2d\u5219\u56e0\u4e3a\u6ca1\u6709zcl\u76f8\u5bf9\u7b80\u5355\u4e00\u4e9b\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.orczhou.com\/wp-content\/uploads\/2011\/02\/Linux-get_free_page.png\" alt=\"\" title=\"Linux-get_free_page\" width=\"690\" height=\"520\" class=\"alignleft size-full wp-image-2852\" srcset=\"https:\/\/www.orczhou.com\/wp-content\/uploads\/2011\/02\/Linux-get_free_page.png 690w, https:\/\/www.orczhou.com\/wp-content\/uploads\/2011\/02\/Linux-get_free_page-300x226.png 300w\" sizes=\"auto, (max-width: 690px) 100vw, 690px\" \/><\/p>\n<p>\u6d41\u7a0b\u56fe\u4e2d\u53ef\u4ee5\u770b\u5230\uff0czone_reclaim_mode\u975e\u96f6\u65f6\uff0cget_page_from_freelist\u3010mm\/page_alloc.c\u3011\u51fd\u6570\u4e2d\u4f1a\u8c03\u7528zone_watermark_ok\u626b\u63cffree_area\uff0c\u5982\u679c\u5f53\u9762\u6709\u6ca1\u6709\u8db3\u591f\u7684\u53ef\u7528\u5185\u5b58\uff0c\u5c31\u4f1a\u8c03\u7528zone_reclaim\u3010mm\/vmscan.c\u3011\u51fd\u6570\u56de\u6536\u5185\u5b58\uff0czone_reclaim\u5b9e\u9645\u8c03\u7528zone_reclaim\u3010mm\/vmscan.\u3011\u6536\u56de\u5185\u5b58\u3002<\/p>\n<div class=\"myt1\">\u6700\u540e<\/div>\n<p>\u6bcf\u6b21\u6df1\u5165\u4e86\u89e3\u4e00\u4e2a\u6280\u672f\u95ee\u9898\uff0c\u968f\u7740\u6316\u636e\u7684\u6df1\u5165\uff0c\u90fd\u53d1\u73b0\u5176\u80cc\u540e\u603b\u975e\u5e38\u6df1\u7684\u80cc\u666f\u77e5\u8bc6\uff0c\u751a\u81f3\u9700\u8981\u6df1\u5165\u5230\u5f88\u591a\u5e95\u5c42\u7cfb\u7edf\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u6709\u65f6\u4f1a\u8ba9\u81ea\u5df1\u8ff7\u5931\uff0c\u4f1a\u8ba9\u81ea\u5df1\u5fd8\u4e86\u5f53\u521d\u7684\u76ee\u7684\u3002\u5982\u679c\u662fLinux\u65b9\u9762\u7684\u6280\u672f\u95ee\u9898\uff0c\u4e00\u822c\u6700\u540e\u4f1a\u6536\u7f29\u5230\u201c\u4f53\u7cfb\u7ed3\u6784\u201d\u3001\u201cLinux\u539f\u7406\u201d\u548c\u201c\u7b97\u6cd5\u201d\uff0c\u8fd9\u6070\u6070\u5bf9\u5e94\u4e86\u8ba1\u7b97\u673a\u7cfb\u8003\u7814\u65f6\u5019\u7684\u4e09\u95e8\u8bfe\u7a0b\uff1a\u4f53\u7cfb\u7ed3\u6784\u3001\u64cd\u4f5c\u7cfb\u7edf\u3001\u548c\u6570\u636e\u7ed3\u6784<\/p>\n<p>\u53c2\u8003\uff1a<\/p>\n<p><a href=\"http:\/\/www.cs.usfca.edu\/~cruse\/cs635s05\/lesson04.ppt\">Managing physical memory<\/a><\/p>\n<p><a href=\"http:\/\/www.amazon.com\/Understanding-Linux-Kernel-Third-Daniel\/dp\/0596005652\/ref=sr_1_1?ie=UTF8&#038;qid=1297494046&#038;sr=8-1\">Understanding the Linux Kernel, 3rd Edition<\/a><\/p>\n<p>\u5e7f\u544a\u65f6\u95f4\uff1a<a href=\"http:\/\/www.orczhou.com\/index.php\/projects\/we-are-hunting-mysql-hacker\/\">\u5de5\u4f5c\u673a\u4f1a&#8211;MySQL Hacker<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6bcf\u6b21\u6df1\u5165\u4e86\u89e3\u4e00\u4e2a\u6280\u672f\u95ee\u9898\uff0c\u968f\u7740\u6316\u636e\u7684\u6df1\u5165\uff0c\u90fd\u53d1\u73b0\u5176\u80cc\u540e\u603b\u975e\u5e38\u6df1\u7684\u80cc\u666f\u77e5\u8bc6\uff0c\u751a\u81f3\u9700\u8981\u6df1\u5165\u5230\u5f88\u591a\u5e95\u5c42\u7cfb\u7edf\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u6709\u65f6\u4f1a\u8ba9\u81ea\u5df1\u8ff7\u5931\uff0c\u4f1a\u8ba9\u81ea\u5df1\u5fd8\u4e86\u5f53\u521d\u7684\u76ee\u7684\u3002 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