Buddy\u7b97\u6cd5\u4ecb\u7ecd<\/strong><\/div>\n
\u76ee\u524d\uff0c\u5185\u6838\u4e2d\u7684Buddy\u7b97\u6cd5\u91c7\u7528\u4e0b\u56fe\u7684\u65b9\u5f0f\u7ba1\u7406\u5185\u5b58\u3002\u6211\u628aBuddy\u7b97\u6cd5\u5206\u4e3a\u5982\u4e0b\u56fe\u6240\u793a\u7684\u4e09\u90e8\u5206\uff0c\u5728\u533a\u57df\u4e00\u4e2d\uff0c\u6838\u5fc3\u7684\u6570\u636e\u7ed3\u6784\u662fstruct zone\uff1b\u5728\u533a\u57df\u4e8c\u4e2d\u6838\u5fc3\u7684\u6570\u636e\u7ed3\u6784\u662fstruct free_area free_area[MAX_ORDER]\uff1b\u5728\u533a\u57df\u4e09\u4e2d\uff0cpage\u94fe\u8868\u662f\u6838\u5fc3\u5185\u5bb9\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e09\u4e2a\u677f\u5757\uff0c\u5e76\u901a\u8fc7\u5206\u914d\u51fd\u6570\u6765\u8bf4\u660eBuddy\u7684\u5de5\u4f5c\u7ec6\u8282\u3002<\/p>\n
$\"\"$ <\/p>\n
1.zone<\/strong><\/span><\/div>\n
\u901a\u5e38\u7528zone\u4ee3\u8868\u4e0d\u540c\u7684\u5185\u5b58\u7ba1\u7406\u533a\uff0c\u5373\u628a\u5185\u5b58\u5212\u5206\u6210\u4e0d\u540c\u7684\u7ec4\uff0c\u6bcf\u4e2a\u7ec4\u5c31\u662f\u4e00\u4e2azone\u3002<\/p>\n
\u5728\u5185\u6838\u4e2d\uff0c\u6bcf\u4e2azone\u901a\u8fc7\u7ed3\u6784\u4f53struct zone\u6765\u8868\u793a\uff0c\u5176\u7ed3\u6784\u4f53\u4e2d\u4e3b\u8981\u6210\u5458\u5982\u4e0b\uff1a<\/p>\n
struct zone {\r\n unsigned long watermark[NR_WMARK];\r\n\r\nunsigned long zone_start_pfn; \r\nunsigned long managed_pages; \r\nunsigned long spanned_pages; \r\nunsigned long present_pages;\r\nstruct free_area free_area[MAX_ORDER];\r\nconst char *name;\r\nstruct pglist_data *zone_pgdat;\r\n}<\/pre>\n
\u6807\u8bc6\u5185\u5b58\u6c34\u7ebf\u7684\u6210\u5458unsigned long watermark[NR_WMARK]\uff0c\u5176\u4e2dNR_WMARK\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n
enum zone_watermarks {\r\n WMARK_MIN,\r\n WMARK_LOW,\r\n WMARK_HIGH,\r\n NR_WMARK\r\n};<\/pre>\n
\u4ece\u4e0a\u9762\u5b9a\u4e49\u53ef\u77e5\uff0c\u6bcf\u4e2azone\u5b58\u5728\u4e09\u4e2a\u6c34\u7ebf\uff0c\u82e5\u5f53\u524dzone\u4e2d\u7a7a\u95f2\u9875\u9ad8\u4e8eWMARK_HIGH\uff0c\u5219\u5f53\u524dzone\u533a\u7684\u7a7a\u95f2\u5185\u5b58\u8f83\u591a\uff1b\u82e5\u7a7a\u95f2\u9875\u4f4e\u4e8eWMARK_LOW\uff0c\u5219\u4ea4\u6362\u5b88\u62a4\u8fdb\u7a0b\u5f00\u59cb\u5c06\u5185\u5b58\u4ea4\u6362\u5230\u78c1\u76d8\u4e0a\uff1b\u82e5\u7a7a\u95f2\u9875\u4f4e\u4e8eWMARK_MIN\uff0c\u5219\u5185\u5b58\u56de\u6536\u7cfb\u7edf\u8fd8\u9700\u8981\u5927\u91cf\u56de\u6536\u5185\u5b58\u3002\u5728\u4f7f\u7528Buddy\u8fdb\u884c\u5185\u5b58\u7533\u8bf7\u65f6\uff0c\u4f1a\u8fdb\u884c\u6c34\u7ebf\u5224\u65ad\uff0c\u4ece\u800c\u8fdb\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\uff1b<\/p>\n
\u4f19\u4f34\u7cfb\u7edf\u7ba1\u7406\u76f8\u5173\u7684\u6210\u5458<\/p>\n
unsigned long zone_start_pfn; \r\nunsigned long managed_pages; \r\nunsigned long spanned_pages; \r\nunsigned long present_pages;\r\nstruct free_area free_area[MAX_ORDER]<\/pre>\n
\u524d\u56db\u4e2a\u662f\u76f8\u5e94zone\u533a\u5bf9\u5e94\u7684\u9875\u53f7\u4fe1\u606f\uff0cfree_area\u662f\u4f19\u4f34\u7b97\u6cd5\u4e2d\u7684\u5173\u952e\u6210\u5458\uff0c\u4e5f\u662f\u533a\u57df\u4e00\u548c\u533a\u57df\u4e8c\u8854\u63a5\u7684\u5173\u952e\u6210\u5458\uff0c\u6bcf\u4e2azone\u533a\u4f1a\u5212\u5206\u4e3aMAX_ORDER\u4e2a\u7ec4\uff0c\u6570\u7ec4free_area\u4e2d\u7684\u6bcf\u4e2a\u6210\u5458\u5c31\u4ee3\u8868\u4e00\u4e2a\u7ec4\u3002<\/p>\n
\u6210\u5458const char *name\u6307\u660e\u4e86\u5bf9\u5e94zone\u533a\u7684\u540d\u79f0\uff0c\u901a\u5e38\u60c5\u51b5\u4e0b\u4e3adma\uff0cNormal\u6216highmem\uff0c\u5176\u4e2dhighmem\u4e0d\u4f1a\u51fa\u73b0\u572864\u4f4d\u7684\u7cfb\u7edf\u4e2d\uff1b\u4e0b\u9762\u662f\u5178\u578b\u768432\u4f4d\u7cfb\u7edf\u4e2d\u7684zone\u5212\u5206\u65b9\u5f0f\uff1a
\nZONE_DMA(0\uff5e16M)\uff1aDMA\u5185\u5b58\u5206\u914d\u533a\uff1b<\/p>\n
ZONE_NORMAL(16MB\uff5e896MB)\uff1a\u666e\u901a\u6620\u5c04\u7684\u5185\u5b58\u533a\u57df\uff1b<\/p>\n
ZONE_HIGHMEM(896MB~)\uff1a\u9ad8\u7aef\u5185\u5b58\u533a\u57df\uff0c\u5176\u4e2d\u7684\u9875\u4e0d\u80fd\u6c38\u4e45\u6620\u5c04\u5230\u5185\u6838\u5730\u5740\u7a7a\u95f4\uff1b\u5185\u6838\u4e00\u822c\u4e0d\u4f7f\u7528\uff0c\u5982\u679c\u8981\u4f7f\u7528\uff0c\u901a\u8fc7kmap\u505a\u52a8\u6001\u6620\u5c04\uff1b<\/p>\n
\u6307\u5411zone\u533a\u5bf9\u5e94node\u7684\u6307\u9488\u6210\u5458struct pglist_data *zone_pgdat\uff0cnode\u662f\u5185\u5b58\u7ba1\u7406\u4e2d\u7684\u4e00\u4e2a\u91cd\u8981\u6210\u5458\u3002\u5bf9\u4e8eUMA\u67b6\u6784\uff0c\u4ec5\u6709\u4e00\u4e2anode\uff0c\u6240\u6709\u7684zone\u5747\u5c5e\u4e8e\u540c\u4e00\u4e2anode\uff0c\u4f46\u5bf9\u4e8eNUMA\u67b6
\n\u6784\uff0c\u4f1a\u6709\u591a\u4e2a\u4e0d\u540c\u7684node\uff0c\u6bcf\u4e2anode\u53c8\u5212\u5206\u4e3a\u4e0d\u540c\u7684zone\uff0c\u6240\u6709zone\u533a\u4e5f\u662f\u901a\u8fc7struct pglist_data\u7ec4\u7ec7\u5728\u4e00\u8d77\u7684\u3002<\/p>\n
2.free_area\u548cpage\u94fe\u8868<\/strong><\/span><\/div>\n
\u5728\u5185\u5b58\u7ba1\u7406\u548c\u5206\u914d\u8fc7\u7a0b\u4e2d\uff0c\u6709\u4e00\u4e2a\u91cd\u8981\u53c2\u6570order\uff0c\u5f53\u6211\u4eec\u91c7\u7528kmalloc\u7533\u8bf7\u5927\u5185\u5b58\u65f6\uff0c\u6700\u540e\u4f1a\u8c03\u7528\u51fd\u6570__alloc_pages_nodemask\u6765\u8fdb\u884c\u5185\u5b58\u7533\u8bf7\u3002\u8be5\u51fd\u6570\u9700\u8981\u4e00\u4e2a\u53c2\u6570order\uff0c\u5f53order = 0\u65f6\uff0c\u8868\u793a\u8981\u7533\u8bf7\u7684\u5185\u5b58\u5927\u5c0f\u662f1\uff0820\uff09\u4e2a\u9875\u9762\uff1b\u5f53order = 1\u65f6\uff0c\u8868\u793a\u8981\u7533\u8bf7\u7684\u5185\u5b58\u5927\u5c0f\u662f2\uff0821\uff09\u4e2a\u9875\u9762\u3002<\/p>\n
\u5728Buddy\u7b97\u6cd5\u4e2d\uff0c\u628a\u5185\u5b58\u6309\u71672\u7684\u5e42\u6b21\u65b9(\u53732order\uff0corder\u7684\u8303\u56f4\u4ece0\u5230MAX_ORDER)\u5212\u5206\u6210\u4e0d\u540c\u7684\u7ec4\uff0c\u6bcf\u4e2a\u7ec4\u5206\u522b\u7528\u5bf9\u5e94\u7684free_area[order]\u8868\u793a\uff0c\u4f8b\u5982free_area[0]\u5bf9\u5e94\u7684\u5c31\u662f\u7531\u5185\u5b58\u5757\u5927\u5c0f\u4e3a20\u4e2a\u9875\u5757\u7ec4\u6210\u7684\u7ec4\uff0cfree_area[1]\u5bf9\u5e94\u7684\u5c31\u662f\u7531\u5185\u5b58\u5757\u5927\u5c0f\u4e3a21\u4e2a\u9875\u5757\u7ec4\u6210\u7684\u7ec4\uff0c\u800c\u7ed3\u6784\u4f53struct zone\u6b63\u662f\u901a\u8fc7\u6210\u5458free_area\u628a\u56fe1\u4e2d\u7684\u533a\u57df\u4e00\u548c\u533a\u57df\u4e8c\u4e32\u8054\u5728\u4e00\u8d77\u3002<\/p>\n
\u7ed3\u6784\u4f53struct free_area\u5b9a\u4e49\u5982\u4e0b\uff08\u4e0d\u540c\u5e73\u53f0\u6216\u8005\u4e0d\u540c\u5185\u6838\u4f1a\u6709\u5dee\u5f02\uff0c\u4f46\u6838\u5fc3\u601d\u60f3\u76f8\u540c\uff09\uff1a<\/p>\n
struct free_area {\r\n struct list_head free_list[MIGRATE_TYPES];\r\n unsigned long nr_free;\r\n };<\/pre>\n
\u4ece\u8be5\u7ed3\u6784\u53ef\u4ee5\u770b\u51fa\uff0c\u6bcf\u4e00\u4e2afree_area\u53c8\u6839\u636eMIGRATE_TYPES\u5212\u5206\u4e3a\u4e0d\u540c\u7684\u7ec4\uff0c\u6bcf\u7ec4\u5206\u522b\u901a\u8fc7\u94fe\u8868free_list\u628a\u540c\u4e00\u7c7b\u9875\u5757\u4e32\u8054\u5728\u4e00\u8d77\uff0c\u8fd9\u6837free_list\u5c31\u628a\u56fe1\u4e2d\u7684\u533a\u57df\u4e8c\u548c\u533a\u57df\u4e09\u4e32\u8054\u5728\u4e00\u8d77\u4e86\uff0c\u4ece\u800c\u95f4\u63a5\u7684\u628a\u533a\u57df\u4e00\u548c\u533a\u57df\u4e09\u5173\u8054\u5728\u4e00\u8d77\u4e86\u3002<\/p>\n
\u7ed3\u6784\u4f53struct page\u6bd4\u8f83\u590d\u6742\uff0c\u5176\u4e2d\u6709\u4e00\u4e2a\u6210\u5458struct list_head lru\uff0c\u901a\u8fc7\u8be5\u6210\u5458\u628a\u56fe1\u4e2d\u533a\u57df\u4e09\u4e2d\u7684\u9875\u5757\u540c\u533a\u57df\u4e8c\u4e2d\u5bf9\u5e94\u7684free_list\u94fe\u63a5\u5728\u4e00\u8d77\u3002<\/p>\n
Buddy\u5185\u5b58\u5206\u914d\u4e0e\u91ca\u653e<\/strong><\/div>\n
\u5728\u6b64\uff0c\u6211\u5c06\u901a\u8fc7\u4e00\u4e2a\u793a\u4f8b\u6765\u7b80\u8981\u5730\u5c55\u793aBuddy\u5185\u5b58\u5206\u914d\u7684\u6838\u5fc3\u601d\u60f3\u3002\u5f53\u901a\u8fc7Buddy\u5206\u914d\u4e00\u4e2a\u7269\u7406\u9875(\u5373order = 0)\u65f6\uff0c\u4f1a\u4ece\u5bf9\u5e94zone\u533a\u4e2dfree_area[0]\u7ba1\u7406\u7684\u533a\u57df\u5206\u914d\u4e00\u4e2a\u9875\u9762\uff08\u6682\u65f6\u5148\u4e0d\u8003\u8651PCP\u7684\u60c5\u51b5\uff09\uff0c\u5e76\u5c06\u8be5\u9875\u9762\u4ece free_area[0] \u94fe\u8868\u4e2d\u79fb\u9664\uff1b\u5f53free_area[0] \u4e0a\u6ca1\u6709\u53ef\u7528\u7684\u7269\u7406\u9875\u65f6\uff0cBuddy\u4f1a\u5728free_area[1]\u4e0a\u67e5\u627e\uff0c\u82e5\u5b58\u5728\u53ef\u7528\u7684\u7269\u7406\u9875\uff0c\u5219\u5c06\u8be5\u9875\u5757\u4ecefree_area[1] \u7684\u94fe\u8868\u4e2d\u79fb\u9664\uff0c\u540c\u65f6\u628a\u8be5\u9875\u5757\u62c6\u5206\u6210\u4e24\u5757\uff0c\u5176\u4e2d\u4e00\u5757\u63d2\u5165\u5230free_area[0]\u4e2d\uff0c\u53e6\u4e00\u5757\u4f20\u9012\u7ed9\u5185\u5b58\u8bf7\u6c42\u8005\uff1b\u5018\u82e5free_area[1]\u4e0a\u4e5f\u6ca1\u6709\u53ef\u7528\u9875\uff0c\u5219\u4f1a\u7ee7\u7eed\u5411\u4e0a\u67e5\u627e\u3002<\/p>\n
\u4e0b\u56fe2\u6240\u793a\u662f\u6ca1\u6709\u5bf9\u5e94oder = 0\u7684\u9875\u5757\u60c5\u51b5\uff0c\u56e0\u6b64\u628aorder = 1\u4e2d\u7684\u4e00\u4e2a\u9875\u5757\u8fdb\u884c\u62c6\u5206\uff0c\u4e00\u534a\u8fd4\u56de\u7ed9order = 1\u7684\u94fe\u8868\uff0c\u4e00\u534a\u8fd4\u56de\u7ed9\u8bf7\u6c42\u8005\u3002\u5047\u5982order = 1\u4e2d\u6ca1\u6709\u9700\u8981\u7684\u9875\u5757\uff0c\u5728\u5185\u5b58\u5206\u914d\u8fc7\u7a0b\u4e2d\u4f1a\u7ee7\u7eed\u4eceorder = 3\u4e2d\u8fdb\u884c\u67e5\u627e\uff0c\u76f4\u5230\u627e\u5230\u9875\u5757\u6216\u8005\u904d\u5386\u5b8c\u6240\u6709order\u3002<\/p>\n
$\"\"$ <\/p>\n
\u5b9e\u9645\u4e0a\uff0c\u5728\u6574\u4e2a\u5185\u5b58\u5206\u914d\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u4f34\u968f\u5f88\u591a\u7279\u6b8a\u60c5\u51b5\u5904\u7406\u3002Buddy\u7b97\u6cd5\u5728\u8fdb\u884c\u5185\u5b58\u5206\u914d\u65f6\uff0c\u4f1a\u6839\u636e\u6c34\u7ebf\u8bbe\u7f6e\uff0c\u6765\u8fdb\u884c\u5185\u5b58\u56de\u6536\u6216\u8005\u5524\u9192\u5185\u6838\u7ebf\u7a0bkswapd\uff0c\u6216\u8005\u662f\u91c7\u7528CPU\u7684\u51b7\u70ed\u9875\u9762\u961f\u5217\u8fdb\u884c\u5185\u5b58\u5206\u914d\uff0c\u6216\u8005\u662f\u8fdb\u884c\u9875\u9762\u79fb\u52a8\u7b49\u3002\u5047\u5982\u5df2\u7ecf\u5c1d\u8bd5\u9875\u9762\u79fb\u52a8\uff0ckswapd\u5df2\u7ecf\u5524\u51fa\u4e86\u4e00\u4e9b\u9875\u9762\uff0c\u540c\u65f6\u4e5f\u8fdb\u884c\u4e86\u5185\u5b58\u56de\u6536\uff0c\u4f9d\u7136\u6ca1\u6709\u53ef\u5206\u914d\u7684\u5185\u5b58\uff0c\u6b64\u65f6\u5c31\u4f1a\u89e6\u53d1out_of_memory\u3002\u603b\u4e4b\uff0c\u8fd9\u4e9b\u7279\u6b8a\u60c5\u51b5\u7684\u5904\u7406\u65b9\u5f0f\u5747\u79bb\u4e0d\u5f00\u56fe1\u6240\u793a\u7684Buddy\u6846\u67b6\u3002<\/p>\n
\u4e0b\u56fe\u662f\u6211\u6839\u636e\u6211\u672c\u5730\u7684\u4ee3\u7801\u6574\u7406\u7684\u91c7\u7528kmalloc\u7533\u8bf7\u5927\u5185\u5b58\u65f6\u7684\u8c03\u7528\u8fc7\u7a0b(\u4f7f\u7528kmalloc\u7533\u8bf7\u5c0f\u5185\u5b58\u65f6\u4e0d\u901a\u8fc7Buddy)\uff0c\u5176\u4e2d\u6700\u5173\u952e\u7684\u5185\u5b58\u5206\u914d\u51fd\u6570\u662fprepare_alloc_pages\uff0cget_page_from_freelist\uff0crmqueue \u548c__alloc_pages_slowpath\u3002\u611f\u5174\u8da3\u7684\u670b\u53cb\u53ef\u4ee5\u7ed3\u5408\u56fe1\u6240\u793a\u7684\u6846\u67b6\u67e5\u770b\u8fd9\u51e0\u4e2a\u51fd\u6570\u7684\u5177\u4f53\u5b9e\u73b0\u3002<\/p>\n
$\"\"$ <\/p>\n
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