\u8981\u7406\u89e3\u670d\u52a1\u5668\u5185\u5b58\u662f\u5982\u4f55\u9010\u6b65\u201c\u52a3\u5316\u201d\u7684\uff0c\u53ef\u4ee5\u4ece\u4e24\u4e2a\u6838\u5fc3\u8fc7\u7a0b\u5165\u624b\uff1a\u5185\u90e8\u7533\u8bf7\u6548\u7387\u4ee5\u53ca\u5185\u6838\u7a7a\u95f4\u7ba1\u7406\u3002<\/p>\n

\u5185\u90e8\u788e\u7247\u4e0e\u5916\u90e8\u788e\u7247<\/h3>\n

\u5185\u5b58\u5206\u914d\u95ee\u9898\u901a\u5e38\u5206\u4e3a\u4e24\u7c7b\uff1a<\/p>\n

\n\n\n\n\n<\/colgroup>\n\n\n\n\n

\u788e\u7247\u7c7b\u578b<\/th>\n	\u4ea7\u751f\u65b9\u5f0f<\/th>\n	\u7cfb\u7edf\u5f71\u54cd<\/th>\n<\/tr>\n
\u5185\u90e8\u788e\u7247<\/strong><\/td>\n	\u4f60\u5206\u914d\u4e86\u5185\u5b58\u5757\uff0c\u4f46\u5b9e\u9645\u6570\u636e\u6ca1\u6709\u586b\u6ee1\u6574\u4e2a\u7a7a\u95f4\u3002<\/td>\n	\u5757\u5185\u591a\u4f59\u7684\u7a7a\u95f2\u7a7a\u95f4\u4f1a\u88ab\u95f2\u7f6e\uff0c\u65e0\u6cd5\u4f7f\u7528\u3002<\/td>\n<\/tr>\n
\u5916\u90e8\u788e\u7247<\/strong><\/td>\n	\u4f60\u957f\u65f6\u95f4\u6301\u7eed\u5730\u5206\u914d\u548c\u91ca\u653e\u52a8\u6001\u5bf9\u8c61\u3002<\/td>\n	\u603b\u7a7a\u95f2\u5185\u5b58\u4f9d\u7136\u5f88\u591a\uff0c\u4f46\u7a7a\u95f4\u88ab\u4e0d\u53ef\u7528\u7684\u5c0f\u95f4\u9699\u5206\u5272\u5f00\u6765\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n \u5185\u90e8\u788e\u7247\u6d6a\u8d39\u7684\u662f\u5df2\u5206\u914d\u5757\u5185\u90e8\u7684\u5b57\u8282\uff1b\u5916\u90e8\u788e\u7247\u5219\u4f1a\u628a\u7a7a\u95f2 RAM \u6253\u6563\u6210\u8bb8\u591a\u5fae\u5c0f\u95f4\u9699\uff0c\u4ece\u800c\u963b\u788d\u8f83\u5927\u5185\u5b58\u5757\u7684\u5206\u914d\u3002<\/p>\n \u957f\u671f\u7f13\u5b58\u4e2d\u7684\u5806\u788e\u7247<\/h3>\n \u957f\u65f6\u95f4\u8fd0\u884c\u7684\u5e94\u7528\u4f1a\u5728\u5185\u5b58\u7f13\u5b58\u4e2d\u5b58\u653e\u4e0d\u540c\u5927\u5c0f\u7684\u5bf9\u8c61\uff0c\u4ee5\u5b9e\u73b0\u5feb\u901f\u8bbf\u95ee\u3002\u4f60\u53ef\u80fd\u4f1a\u5c06\u7528\u6237\u4f1a\u8bdd\u3001\u52a8\u6001\u6570\u636e\u5e93\u67e5\u8be2\u7ed3\u679c\uff0c\u6216 API \u54cd\u5e94\u5b58\u653e\u5728 RAM \u4e2d\u3002<\/p>\n \u5e94\u7528\u4f1a\u4e0d\u65ad\u521b\u5efa\u548c\u5220\u9664\u8fd9\u4e9b\u5927\u5c0f\u4e0d\u4e00\u7684\u7f13\u5b58\u5bf9\u8c61\u3002\u8fd9\u6837\u7684\u6301\u7eed\u5faa\u73af\u4f1a\u628a\u5806\u7a7a\u95f4\u5207\u5272\u6210\u8bb8\u591a\u96f6\u6563\u7684\u5c0f\u578b\u7a7a\u95f2\u533a\u57df\u3002\u7ecf\u8fc7\u6570\u5468\u751a\u81f3\u6570\u6708\u540e\uff0c\u5373\u4f7f\u7cfb\u7edf\u4e2d\u4ecd\u7136\u6709\u6570 GB \u53ef\u7528 RAM\uff0c\u7a0b\u5e8f\u4e5f\u53ef\u80fd\u65e0\u6cd5\u4e3a\u65b0\u7684\u5927\u5bf9\u8c61\u627e\u5230\u4e00\u5757\u8fde\u7eed\u7a7a\u95f4\u3002<\/p>\n Linux \u5185\u6838\u9875\u5206\u914d\u5668\u7684\u673a\u5236<\/h3>\n \u5f53\u5e94\u7528\u8bf7\u6c42\u5185\u5b58\u65f6\uff0c\u4f19\u4f34\u5206\u914d\u5668\uff08buddy allocator\uff09\u4f1a\u6309\u7167\u7279\u5b9a\u6d41\u7a0b\u5de5\u4f5c\uff1a<\/p>\n \n \u68c0\u67e5\u76ee\u6807\u9636\u6570\u7a7a\u95f2\u94fe\u8868<\/strong>\uff1a\u5148\u5728\u4e0e\u6240\u9700\u5927\u5c0f\u5b8c\u5168\u5339\u914d\u7684 order \u7a7a\u95f2\u94fe\u8868\u4e2d\u67e5\u627e\u3002\u82e5\u5b58\u5728\u5408\u9002\u5757\uff0c\u7cfb\u7edf\u4f1a\u7acb\u5373\u5b8c\u6210\u5206\u914d\u3002<\/li>\n \u68c0\u67e5\u66f4\u9ad8\u9636\u94fe\u8868<\/strong>\uff1a\u5982\u679c\u76ee\u6807 order \u94fe\u8868\u4e3a\u7a7a\uff0c\u5c31\u7ee7\u7eed\u67e5\u627e\u66f4\u5927\u7684\u7a7a\u95f2\u5757\u94fe\u8868\u3002<\/li>\n \u9012\u5f52\u62c6\u5206<\/strong>\uff1a\u5c06\u8f83\u5927\u7684\u5757\u62c6\u5206\u4e3a\u4e24\u4e2a\u5927\u5c0f\u76f8\u7b49\u7684\u201c\u4f19\u4f34\u5757\uff08buddies\uff09\u201d\u3002\u5185\u6838\u4f7f\u7528\u5176\u4e2d\u4e00\u534a\u6ee1\u8db3\u8bf7\u6c42\uff0c\u5e76\u5c06\u5269\u4f59\u4e00\u534a\u653e\u56de\u8f83\u4f4e order \u7684\u7a7a\u95f2\u94fe\u8868\u3002<\/li>\n<\/ol>\n \u9ad8\u8d1f\u8f7d\u670d\u52a1\u5668\u4f1a\u4e0d\u65ad\u62c6\u5206\u8fd9\u4e9b\u5185\u5b58\u5757\uff0c\u968f\u7740\u8fd0\u884c\u65f6\u95f4\u589e\u957f\uff0c\u5185\u5b58\u788e\u7247\u5316\u4f1a\u8fdb\u4e00\u6b65\u52a0\u5267\u3002<\/p>\n \u5185\u5b58\u788e\u7247\u5316\u5bf9\u670d\u52a1\u5668\u7a33\u5b9a\u6027\u7684\u5f71\u54cd<\/strong><\/h2>\n \u4e25\u91cd\u7684\u5185\u5b58\u788e\u7247\u5316\u4f1a\u5728\u4e0d\u77e5\u4e0d\u89c9\u4e2d\u6301\u7eed\u524a\u5f31\u7cfb\u7edf\u6027\u80fd\u3002\u4f60\u4e5f\u8bb8\u4f1a\u770b\u5230\u603b\u7a7a\u95f2 RAM \u4f9d\u7136\u5f88\u9ad8\uff0c\u4f46\u670d\u52a1\u5668\u5b9e\u9645\u4e0a\u5df2\u7ecf\u51fa\u73b0\u9690\u85cf\u7684\u6027\u80fd\u74f6\u9888\u4e0e\u8fd0\u884c\u4e0d\u7a33\u5b9a\u95ee\u9898\u3002<\/p>\n \u5206\u914d\u53d8\u6162\u4e0e RAM \u6d6a\u8d39<\/h3>\n \u5f53\u5185\u5b58\u88ab\u5206\u88c2\u6210\u5927\u91cf\u7ec6\u5c0f\u4e14\u4e0d\u8fde\u7eed\u7684\u5757\u65f6\uff0c\u670d\u52a1\u5668\u5c31\u4f1a\u5931\u53bb\u9ad8\u6548\u6027\u3002Linux \u5185\u6838\u5fc5\u987b\u626b\u63cf\u591a\u4e2a\u7a7a\u95f2\u94fe\u8868\uff0c\u624d\u80fd\u4e3a\u65b0\u8fdb\u7a0b\u627e\u5230\u5408\u9002\u7684\u5757\u3002\u8fd9\u79cd\u989d\u5916\u641c\u7d22\u4f1a\u5ef6\u957f\u5206\u914d\u65f6\u95f4\uff0c\u5e76\u63d0\u9ad8\u5e94\u7528\u5ef6\u8fdf\u3002<\/p>\n \u5173\u952e\u7ed3\u8bba\uff1a<\/strong>\u5df2\u5360\u7528\u9875\u4e4b\u95f4\u7684\u4e0d\u53ef\u7528\u95f4\u9699\u4f1a\u5f62\u6210\u201c\u6401\u6d45\u5bb9\u91cf\u201d\u3002\u7cfb\u7edf\u65e0\u6cd5\u628a\u8fd9\u4e9b\u5206\u6563\u7684\u5c0f\u95f4\u9699\u91cd\u65b0\u62fc\u63a5\u8d77\u6765\u6ee1\u8db3\u8f83\u5927\u7684\u5206\u914d\u8bf7\u6c42\uff0c\u56e0\u6b64\u53ef\u5b9e\u9645\u5229\u7528\u7684 RAM \u5bb9\u91cf\u4f1a\u663e\u8457\u4e0b\u964d\u3002<\/p><\/blockquote>\n \u4e0b\u8868\u5c55\u793a\u4e86\u5185\u5b58\u788e\u7247\u5316\u5982\u4f55\u5f71\u54cd\u5206\u914d\u901f\u5ea6\u4e0e RAM \u5229\u7528\u6548\u7387\uff1a<\/p>\n \n\n\n\n\n\n<\/colgroup>\n\n\n\n\n\n \u72b6\u6001<\/th>\n \u5206\u914d\u641c\u7d22\u65f6\u95f4<\/th>\n \u53ef\u7528\u5bb9\u91cf<\/th>\n \u6574\u4f53\u670d\u52a1\u5668\u6548\u7387<\/th>\n<\/tr>\n \u8fde\u7eed\u5185\u5b58<\/strong><\/td>\n \u5feb\uff08\u76f4\u63a5\u547d\u4e2d Buddy \u94fe\u8868\uff09<\/td>\n \u9ad8\uff0895\u201399%\uff09<\/td>\n \u6700\u4f73<\/td>\n<\/tr>\n \u8f7b\u5ea6\u788e\u7247\u5316<\/strong><\/td>\n \u4e2d\u7b49\uff08\u9700\u626b\u63cf\u591a\u4e2a\u94fe\u8868\uff09<\/td>\n \u4e2d\u7b49\uff0870\u201385%\uff09<\/td>\n \u53ef\u63a5\u53d7<\/td>\n<\/tr>\n \u4e25\u91cd\u788e\u7247\u5316<\/strong><\/td>\n \u6162\uff08\u6df1\u5ea6\u904d\u5386\uff09<\/td>\n \u4f4e\uff08\u4f4e\u4e8e 50%\uff09<\/td>\n \u8f83\u5dee<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n \u5185\u6838\u5185\u5b58\u538b\u7f29\u5f15\u53d1\u7684\u5ef6\u8fdf\u5c16\u5cf0<\/h3>\n \u5f53\u4f19\u4f34\u5206\u914d\u5668\u65e0\u6cd5\u627e\u5230\u8fde\u7eed\u7a7a\u95f2\u9875\u65f6\uff0cLinux \u5185\u6838\u4f1a\u89e6\u53d1\u76f4\u63a5\u5185\u5b58\u538b\u7f29\uff08direct memory compaction\uff09<\/strong>\u3002\u5185\u6838\u4f1a\u5c1d\u8bd5\u5728\u7269\u7406 RAM \u4e2d\u79fb\u52a8\u5df2\u5206\u914d\u9875\u9762\uff0c\u4ee5\u6574\u7406\u51fa\u66f4\u5927\u7684\u8fde\u7eed\u5185\u5b58\u5757\u3002<\/p>\n [ \u5df2\u5206\u914d\u9875\u9762 ] [ \u7a7a\u95f2\u7a7a\u95f4 ] [ \u5df2\u5206\u914d\u9875\u9762 ] [ \u7a7a\u95f2\u7a7a\u95f4 ]\r\n \u2502 \u2502\r\n \u25bc\uff08\u5185\u6838\u538b\u7f29\u8fc7\u7a0b\uff09 \u25bc\r\n[ \u5df2\u5206\u914d\u9875\u9762 ] [ \u5df2\u5206\u914d\u9875\u9762 ] [ \u7a7a\u95f2\u7a7a\u95f4 ] [ \u7a7a\u95f2\u7a7a\u95f4 ]<\/code><\/pre>\n \u8fd9\u4e00\u538b\u7f29\u8fc7\u7a0b\u4f1a\u6d88\u8017\u5927\u91cf CPU \u8d44\u6e90\uff0c\u5e76\u6270\u4e71\u6b63\u5e38\u8fd0\u884c\uff1a<\/p>\n \n \u9875\u9762\u56de\u6536<\/strong>\uff1a\u5185\u6838\u626b\u63cf\u6d3b\u8dc3\u5185\u5b58\uff0c\u5bfb\u627e\u53ef\u8fc1\u79fb\u9875\u9762\u3002<\/li>\n \u540c\u6b65\u6682\u505c<\/strong>\uff1a\u5728\u79fb\u52a8\u9875\u9762\u65f6\uff0c\u5185\u6838\u4f1a\u6682\u505c\u4f60\u7684\u5e94\u7528\u7ebf\u7a0b\u3002<\/li>\n \u7f13\u5b58\u5931\u6548<\/strong>\uff1a\u9891\u7e41\u7684\u9875\u9762\u79fb\u52a8\u4f1a\u51b2\u5237 CPU \u7f13\u5b58\u5e76\u964d\u4f4e\u8bbf\u95ee\u901f\u5ea6\u3002<\/li>\n<\/ul>\n \u8fd9\u4e9b\u5185\u6838\u884c\u4e3a\u4f1a\u5728\u751f\u4ea7\u5e94\u7528\u4e2d\u9020\u6210\u4e25\u91cd\u7684\u5c3e\u5ef6\u8fdf\u5c16\u5cf0\u3002\u4f60\u7684 Web \u670d\u52a1\u53ef\u80fd\u4f1a\u5728\u6fc0\u70c8\u538b\u7f29\u5468\u671f\u4e2d\uff0c\u4ece\u539f\u672c\u6beb\u79d2\u7ea7\u54cd\u5e94\u9661\u7136\u4e0a\u5347\u5230\u79d2\u7ea7\u3002<\/p>\n \u4f4e\u4f59\u91cf\u7cfb\u7edf\u4e2d\u7684 OOM \u5d29\u6e83<\/h3>\n \u5728\u5185\u5b58\u4f59\u91cf\u6709\u9650\u7684\u7cfb\u7edf\u4e2d\uff0c\u4e25\u91cd\u788e\u7247\u5316\u53ef\u80fd\u5f15\u53d1\u707e\u96be\u6027\u6545\u969c\u3002\u4f60\u53ef\u80fd\u5728\u76d1\u63a7\u9762\u677f\u4e2d\u770b\u5230\u670d\u52a1\u5668\u4ecd\u6709 30% \u751a\u81f3\u66f4\u591a\u7a7a\u95f2 RAM\uff0c\u4f46\u5e94\u7528\u5374\u7a81\u7136\u56e0 Out-Of-Memory\uff08OOM\uff09\u5f02\u5e38\u800c\u5d29\u6e83\u3002<\/p>\n \u8fd9\u662f\u56e0\u4e3a\u5e94\u7528\u8bf7\u6c42\u4e86\u4e00\u4e2a\u9ad8\u9636\u8fde\u7eed\u5757\uff0c\u4f8b\u5982 order-3\uff0832KB\uff09\u6216 order-4\uff0864KB\uff09\u9875\u6846\u3002\u6b64\u65f6\u5185\u6838\u4f1a\u5c1d\u8bd5\u76f4\u63a5\u538b\u7f29\uff0c\u4f46\u6d3b\u8dc3\u4e14\u88ab\u56fa\u5b9a\uff08pinned\uff09\u7684\u5757\u4f1a\u963b\u6b62\u9875\u9762\u8fc1\u79fb\u3002<\/p>\n \u5982\u679c\u538b\u7f29\u4ecd\u7136\u65e0\u6cd5\u6574\u7406\u51fa\u8fde\u7eed\u7a7a\u95f4\uff0cLinux \u5185\u6838\u5c31\u4f1a\u89e6\u53d1 OOM killer\u3002OOM killer \u4f1a\u9009\u62e9\u5e76\u7ec8\u6b62\u5173\u952e\u5e94\u7528\u8fdb\u7a0b\u4ee5\u56de\u6536\u7cfb\u7edf\u8d44\u6e90\uff0c\u4ece\u800c\u5bfc\u81f4\u6beb\u65e0\u9884\u8b66\u7684\u670d\u52a1\u4e2d\u65ad\u3002<\/p>\n \u5728\u751f\u4ea7\u73af\u5883\u4e2d\u8bca\u65ad\u5185\u5b58\u788e\u7247\u5316<\/strong><\/h2>\n \u4f60\u5fc5\u987b\u5728\u5e94\u7528\u5d29\u6e83\u4e4b\u524d\u8bc6\u522b\u670d\u52a1\u5668\u95ee\u9898\u3002Linux \u539f\u751f\u547d\u4ee4\u53ef\u4ee5\u5e2e\u52a9\u4f60\u68c0\u67e5\u7269\u7406\u5185\u5b58\u5e03\u5c40\uff0c\u5e76\u5b9e\u65f6\u68c0\u6d4b\u5185\u5b58\u788e\u7247\u5316\u3002<\/p>\n \u68c0\u67e5 Proc Buddyinfo \u4e0e Meminfo<\/h3>\n \u4f60\u53ef\u4ee5\u8bfb\u53d6 \/proc\/buddyinfo<\/code> \u6587\u4ef6\u6765\u67e5\u770b\u53ef\u7528\u7684\u8fde\u7eed\u9875\u5757\u3002\u8be5\u6587\u4ef6\u4f1a\u663e\u793a\u5404\u4e2a\u5185\u5b58\u533a\u57df\u4e2d\u6bcf\u4e2a order \u7684\u7a7a\u95f2\u5757\u6570\u91cf\u3002\u5982\u679c\u4f4e\u9636\u6570\u91cf\u5f88\u591a\u800c\u9ad8\u9636\u4e3a 0\uff0c\u5c31\u8bf4\u660e\u7269\u7406\u5185\u5b58\u5df2\u7ecf\u51fa\u73b0\u4e25\u91cd\u788e\u7247\u5316\u3002<\/p>\n cat \/proc\/buddyinfo<\/code><\/pre>\n \u63a5\u7740\uff0c\u67e5\u770b \/proc\/meminfo<\/code> \u4ee5\u68c0\u67e5\u603b\u5bb9\u91cf\u3002\u91cd\u70b9\u5173\u6ce8 MemAvailable<\/code> \u548c SUnreclaim<\/code>\u3002\u5982\u679c\u7a7a\u95f2 RAM \u4e0e\u53ef\u5b9e\u9645\u4f7f\u7528\u7a7a\u95f4\u4e4b\u95f4\u5b58\u5728\u8f83\u5927\u5dee\u8ddd\uff0c\u5c31\u8bf4\u660e\u5206\u6563\u7684\u5185\u5b58\u95f4\u9699\u6b63\u5728\u963b\u788d\u5206\u914d\u8bf7\u6c42\u3002<\/p>\n \u76d1\u63a7\u9875\u5206\u914d\u5931\u8d25<\/h3>\n Linux \u5185\u6838\u4f1a\u76f4\u63a5\u5c06\u5206\u914d\u95ee\u9898\u8bb0\u5f55\u5230\u7cfb\u7edf\u65e5\u5fd7\u4e2d\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 dmesg<\/code> \u547d\u4ee4\u641c\u7d22 page allocation failure \u8b66\u544a\uff1a<\/p>\n dmesg -T | grep -i \"page allocation failure\"<\/code><\/pre>\n \u4e3b\u52a8\u63d0\u793a\uff1a<\/strong>\u8fd9\u4e9b\u65e5\u5fd7\u9879\u4f1a\u663e\u793a\u5931\u8d25\u7684\u5177\u4f53\u5206\u914d order\u3002\u5b83\u4eec\u80fd\u591f\u8bc1\u660e\uff1a\u5373\u4f7f\u603b RAM \u770b\u8d77\u6765\u5145\u8db3\uff0c\u7cfb\u7edf\u4e5f\u7f3a\u4e4f\u8db3\u591f\u7684\u8fde\u7eed\u5185\u5b58\u5757\u3002<\/p><\/blockquote>\n \u901a\u8fc7 Vmstat \u548c Sar \u8ddf\u8e2a\u7cfb\u7edf\u8d8b\u52bf<\/h3>\n \u4f60\u53ef\u4ee5\u901a\u8fc7\u8ddf\u8e2a\u5185\u6838\u5185\u5b58\u6307\u6807\u6765\u76d1\u63a7\u957f\u671f\u7cfb\u7edf\u5065\u5eb7\u72b6\u51b5\u3002\/proc\/vmstat<\/code> \u6587\u4ef6\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u8ba1\u6570\u5668\u7edf\u8ba1\u4fe1\u606f\uff0c\u53ef\u7528\u4e8e\u8bc6\u522b\u4e25\u91cd\u7684\u538b\u7f29\u6d3b\u52a8\u4e0e\u5206\u914d\u5ef6\u8fdf\u3002<\/p>\n \u4f60\u5e94\u91cd\u70b9\u76d1\u63a7\u4ee5\u4e0b vmstat<\/code> \u6307\u6807\uff0c\u4ee5\u53d1\u73b0\u4e0d\u65ad\u52a0\u5267\u7684\u6027\u80fd\u8d8b\u52bf\uff1a<\/p>\n \n\n\n\n<\/colgroup>\n\n\n\n\n\n\n\n\n\n \u6307\u6807\u540d\u79f0<\/th>\n \u4f5c\u7528 \/ \u8ffd\u8e2a\u6d3b\u52a8<\/th>\n<\/tr>\n compact_stall<\/code><\/td>\n \u8bb0\u5f55\u8fdb\u7a0b\u56e0\u76f4\u63a5\u538b\u7f29\u800c\u88ab\u963b\u585e\u7684\u6b21\u6570\u3002<\/td>\n<\/tr>\n pgscan_direct<\/code><\/td>\n \u7edf\u8ba1\u8fdb\u7a0b\u5728\u76f4\u63a5\u56de\u6536\u8fc7\u7a0b\u4e2d\u540c\u6b65\u626b\u63cf\u7684\u9875\u9762\u6570\u91cf\u3002<\/td>\n<\/tr>\n pgsteal_direct<\/code><\/td>\n \u7edf\u8ba1\u901a\u8fc7\u76f4\u63a5\u56de\u6536\u6210\u529f\u91ca\u653e\u7684\u9875\u9762\u6570\u91cf\u3002<\/td>\n<\/tr>\n allocstall_normal<\/code><\/td>\n \u7edf\u8ba1\u53d1\u751f\u5728 Normal \u5185\u5b58\u533a\u57df\u4e2d\u7684\u76f4\u63a5\u56de\u6536\u8fdb\u5165\u6b21\u6570\u3002<\/td>\n<\/tr>\n allocstall_dma32<\/code><\/td>\n \u7edf\u8ba1\u53d1\u751f\u5728 DMA32 \u5185\u5b58\u533a\u57df\u4e2d\u7684\u76f4\u63a5\u56de\u6536\u8fdb\u5165\u6b21\u6570\u3002<\/td>\n<\/tr>\n allocstall_dma<\/code><\/td>\n \u7edf\u8ba1\u53d1\u751f\u5728 DMA \u5185\u5b58\u533a\u57df\u4e2d\u7684\u76f4\u63a5\u56de\u6536\u8fdb\u5165\u6b21\u6570\u3002<\/td>\n<\/tr>\n allocstall_movable<\/code><\/td>\n \u7edf\u8ba1\u53d1\u751f\u5728 Movable \u5185\u5b58\u533a\u57df\u4e2d\u7684\u76f4\u63a5\u56de\u6536\u8fdb\u5165\u6b21\u6570\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n \u5982\u679c\u8fd9\u4e9b\u8ba1\u6570\u5668\u6301\u7eed\u4e0a\u5347\uff0c\u5c31\u610f\u5473\u7740\u5185\u6838\u6b63\u5728\u4e3a\u51d1\u51fa\u7a7a\u95f2\u9875\u800c\u4ed8\u51fa\u8fc7\u9ad8\u4ee3\u4ef7\u3002<\/p>\n \u7f13\u89e3\u4e0e\u5185\u5b58\u7ba1\u7406\u7b56\u7565<\/strong><\/h2>\n \u4f60\u53ef\u4ee5\u4e3b\u52a8\u7ba1\u7406\u670d\u52a1\u5668\u5185\u5b58\uff0c\u4ee5\u9632\u6b62\u4e25\u91cd\u7684\u6027\u80fd\u9000\u5316\u3002\u65e0\u8bba\u662f\u5728\u5185\u6838\u5c42\u8fd8\u662f\u5e94\u7528\u5c42\uff0c\u91c7\u7528\u6709\u6548\u7684\u7f13\u89e3\u624b\u6bb5\u90fd\u80fd\u5e2e\u52a9\u7cfb\u7edf\u7ef4\u6301\u957f\u671f\u53ef\u7528\u6027\u3002<\/p>\n \u8c03\u4f18\u5185\u6838\u538b\u7f29\u53c2\u6570<\/h3>\n Linux \u5185\u6838\u5728 \/proc\/sys\/vm\/<\/code> \u4e0b\u63d0\u4f9b\u4e86\u591a\u4e2a\u914d\u7f6e\u9879\uff0c\u7528\u4e8e\u7ba1\u7406\u9875\u5e03\u5c40\u6548\u7387\u3002\u4f60\u53ef\u4ee5\u5728\u4e0d\u91cd\u542f\u751f\u4ea7\u8282\u70b9\u7684\u524d\u63d0\u4e0b\u5b9e\u65f6\u8c03\u6574\u8fd9\u4e9b\u53c2\u6570\u3002<\/p>\n # \u67e5\u770b\u5f53\u524d\u5185\u6838\u538b\u7f29\u8bbe\u7f6e\r\nsysctl vm.compaction_proactiveness vm.extfrag_threshold vm.min_free_kbytes<\/code><\/pre>\n \u4f60\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u4e09\u4e2a\u4e3b\u8981\u53c2\u6570\u6765\u4f18\u5316\u5185\u6838\u540e\u53f0\u884c\u4e3a\uff1a<\/p>\n \n vm.compaction_proactiveness<\/code>\uff1a\u8be5\u53c2\u6570\u63a7\u5236\u5185\u6838\u5728\u5206\u914d\u8bf7\u6c42\u5931\u8d25\u524d\uff0c\u4f1a\u591a\u79ef\u6781\u5730\u9884\u5148\u6574\u7406\u7269\u7406\u9875\u3002\u63d0\u9ad8 vm.compaction_proactiveness<\/code> \u7684\u503c\uff0c\u4f1a\u4fc3\u4f7f\u5185\u6838\u66f4\u4e3b\u52a8\u5730\u8fdb\u884c\u5185\u5b58\u538b\u7f29\uff0c\u4ee5\u7ef4\u6301\u8fde\u7eed\u5185\u5b58\u53ef\u7528\u6027\u3002\u4e0d\u8fc7\uff0c\u7531\u4e8e\u538b\u7f29\u672c\u8eab\u4f1a\u5e26\u6765\u8fd0\u884c\u65f6\u5f00\u9500\uff0c\u66f4\u9ad8\u7684\u8bbe\u7f6e\u4e5f\u4f1a\u589e\u52a0\u7cfb\u7edf\u8d1f\u62c5\uff1b\u800c\u5c06\u5176\u8bbe\u4e3a 0 \u5219\u8868\u793a\u5b8c\u5168\u5173\u95ed\u4e3b\u52a8\u538b\u7f29\u3002\u7cfb\u7edf\u4e2d\u4f1a\u6709\u4e00\u4e2a\u4e13\u95e8\u7684 kcompactd<\/code> \u7ebf\u7a0b\u5728\u8fd0\u884c\u671f\u95f4\u6301\u7eed\u5de5\u4f5c\uff0c\u6d3b\u8dc3\u65f6\u6700\u591a\u53ef\u80fd\u5360\u7528\u5355\u4e2a CPU \u6838\u5fc3\u7684 100%\u3002<\/li>\n vm.extfrag_threshold<\/code>\uff1a\u8be5\u53c2\u6570\u51b3\u5b9a\u5185\u6838\u4f55\u65f6\u4ece\u9875\u9762\u56de\u6536\u5207\u6362\u5230\u76f4\u63a5\u538b\u7f29\u3002\u9608\u503c\u8d8a\u9ad8\uff0c\u8d8a\u503e\u5411\u4e8e\u76f4\u63a5\u5c1d\u8bd5\u5206\u914d\u9875\u9762\uff1b\u9608\u503c\u8d8a\u4f4e\uff0c\u5219\u8d8a\u65e9\u89e6\u53d1\u538b\u7f29\u3002<\/li>\n vm.min_free_kbytes<\/code>\uff1a\u63d0\u9ad8\u8be5\u503c\u4f1a\u8feb\u4f7f\u5185\u6838\u4fdd\u7559\u66f4\u5927\u7684\u7a7a\u95f2\u9875\u50a8\u5907\u3002\u8fd9\u6837\u7684\u50a8\u5907\u53ef\u5728\u7a81\u53d1\u5185\u5b58\u4f7f\u7528\u9ad8\u5cf0\u65f6\uff0c\u4e3a\u4f19\u4f34\u5206\u914d\u5668\u63d0\u4f9b\u5e94\u6025\u4f59\u91cf\u3002<\/li>\n<\/ul>\n \u914d\u7f6e\u5efa\u8bae\uff1a<\/strong>\u5bf9\u4e8e\u5ef6\u8fdf\u654f\u611f\u578b\u6570\u636e\u5e93\u8282\u70b9\uff0c\u53ef\u5c06 vm.compaction_proactiveness<\/code> \u8bbe\u4e3a 20 \u5230 50 \u7684\u4e2d\u7b49\u503c\u3002\u8fd9\u6837\u65e2\u80fd\u964d\u4f4e\u788e\u7247\u5316\u98ce\u9669\uff0c\u4e5f\u80fd\u907f\u514d kcompactd<\/code> \u540e\u53f0\u7ebf\u7a0b\u5728\u4e1a\u52a1\u9ad8\u5cf0\u671f\u72ec\u5360\u6574\u4e2a CPU \u6838\u5fc3\u3002<\/p><\/blockquote>\n \u4f7f\u7528\u81ea\u5b9a\u4e49\u5185\u5b58\u5206\u914d\u5668<\/h3>\n \u9ed8\u8ba4\u7684\u7cfb\u7edf\u5206\u914d\u5e93\uff08\u5982\u6807\u51c6 glibc malloc<\/code>\uff09\u5728\u9762\u5bf9\u9ad8\u9891\u7387\u3001\u957f\u65f6\u95f4\u8fd0\u884c\u7684\u5206\u914d\u6a21\u5f0f\u65f6\uff0c\u5f80\u5f80\u5bb9\u6613\u4ea7\u751f\u788e\u7247\u5316\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528\u66f4\u73b0\u4ee3\u3001\u66f4\u504f\u6027\u80fd\u4f18\u5316\u7684\u5206\u914d\u5668\u6765\u66ff\u4ee3\u9ed8\u8ba4\u5b9e\u73b0\u3002<\/p>\n \n\n\n\n\n<\/colgroup>\n\n\n\n\n\n \u5206\u914d\u5668\u540d\u79f0<\/th>\n \u4e3b\u8981\u8bbe\u8ba1\u7b56\u7565<\/th>\n \u5173\u952e\u67b6\u6784\u4f18\u52bf<\/th>\n<\/tr>\n glibc malloc<\/strong><\/td>\n \u901a\u7528\u578b\u5806\u7ba1\u7406<\/td>\n \u6807\u51c6\u9ed8\u8ba4\u5b9e\u73b0\uff0c\u4f46\u957f\u671f\u8fd0\u884c\u540e\u5bb9\u6613\u51fa\u73b0\u8f83\u4e25\u91cd\u7684\u5185\u5b58\u788e\u7247\u5316\u3002<\/td>\n<\/tr>\n jemalloc<\/strong><\/td>\n \u57fa\u4e8e arena \u7684\u5206\u914d\u673a\u5236\u4e0e\u7ebf\u7a0b\u7f13\u5b58<\/td>\n \u53ef\u51cf\u5c11\u5206\u6563\u5206\u914d\uff0c\u5e76\u5c06\u4e0d\u518d\u9700\u8981\u7684\u9875\u9762\u5f52\u8fd8\u7ed9\u5185\u6838\u3002<\/td>\n<\/tr>\n tcmalloc<\/strong><\/td>\n \u7ebf\u7a0b\u7f13\u5b58\u578b malloc<\/td>\n \u5229\u7528\u7ebf\u7a0b\u672c\u5730\u7f13\u5b58\u51cf\u5c11\u9501\u7ade\u4e89\uff0c\u5e76\u4fdd\u6301\u66f4\u5747\u5300\u7684\u5185\u5b58\u5757\u5927\u5c0f\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n \u8fd9\u4e9b\u4e13\u7528\u5206\u914d\u5668\u4f1a\u5c06\u5185\u5b58\u5212\u5206\u4e3a\u56fa\u5b9a\u5927\u5c0f\u7684 bin\uff0c\u5e76\u4e3a\u4e0d\u540c CPU \u7ebf\u7a0b\u5206\u914d\u72ec\u7acb arena\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7 LD_PRELOAD<\/code> \u73af\u5883\u53d8\u91cf\uff0c\u8f7b\u677e\u5c06 jemalloc<\/code> \u6216 tcmalloc<\/code> \u96c6\u6210\u5230\u5e94\u7528\u4e2d\uff1a<\/p>\n # \u4f7f\u7528 jemalloc \u4f5c\u4e3a\u5e95\u5c42\u5206\u914d\u5668\u542f\u52a8\u5e94\u7528\r\nLD_PRELOAD=\/usr\/lib\/x86_64-linux-gnu\/libjemalloc.so.2 .\/your_server_binary<\/code><\/pre>\n \u5e94\u7528\u5c42\u5185\u5b58\u6c60\u5b9e\u8df5<\/h3>\n \u4f60\u53ef\u4ee5\u901a\u8fc7\u5728\u5e94\u7528\u4ee3\u7801\u4e2d\u6784\u5efa\u81ea\u5b9a\u4e49\u5185\u5b58\u6c60\uff0c\u6d88\u9664\u52a8\u6001\u5806\u5206\u914d\u7684\u989d\u5916\u5f00\u9500\u3002\u5185\u5b58\u6c60\u5141\u8bb8\u670d\u52a1\u590d\u7528\u56fa\u5b9a\u5927\u5c0f\u7684\u69fd\u4f4d\uff0c\u800c\u4e0d\u662f\u53cd\u590d\u8c03\u7528\u52a8\u6001\u5185\u6838\u5206\u914d\u3002<\/p>\n +--------------------------------------------------------+\r\n| \u5185\u5b58\u6c60 |\r\n| +--------------+ +--------------+ +--------------+ |\r\n| | \u69fd\u4f4d 1\uff08\u7a7a\u95f2\uff09| | \u69fd\u4f4d 2\uff08\u5360\u7528\uff09| | \u69fd\u4f4d 3\uff08\u7a7a\u95f2\uff09| |\r\n| +--------------+ +--------------+ +--------------+ |\r\n+--------------------------------------------------------+<\/code><\/pre>\n \u4f60\u53ef\u4ee5\u91c7\u7528\u4ee5\u4e0b\u5173\u952e\u5e94\u7528\u6a21\u5f0f\uff0c\u4ee5\u7ef4\u6301\u7a33\u5b9a\u7684\u4e00\u81f4\u6027\u8fd0\u884c\u6027\u80fd\uff1a<\/p>\n \n \u5bf9\u8c61\u590d\u7528\u6c60<\/strong>\uff1a\u5728\u670d\u52a1\u5668\u521d\u59cb\u5316\u9636\u6bb5\u9884\u5206\u914d\u5927\u578b\u6570\u7ec4\u7f13\u51b2\u533a\u3002\u5c06\u53ef\u53d8\u6570\u636e\u5199\u5165\u9884\u5206\u914d\u69fd\u4f4d\uff0c\u5e76\u5728\u5de5\u4f5c\u7ebf\u7a0b\u5904\u7406\u5b8c\u6210\u540e\u628a\u69fd\u4f4d\u5f52\u8fd8\u6c60\u4e2d\u3002<\/li>\n Slab \u5206\u914d\u5668<\/strong>\uff1a\u5c06\u5c0f\u578b\u3001\u540c\u6784\u7684\u6570\u636e\u7ed3\u6784\u7ec4\u7ec7\u5230\u7edf\u4e00\u4e14\u8fde\u7eed\u7684\u5757\u4e2d\uff0c\u5373 slab\u3002\u5e94\u7528\u53ef\u4ee5\u6574\u5757\u91ca\u653e slab\uff0c\u4ece\u800c\u907f\u514d\u96f6\u6563\u9875\u95f4\u9699\u3002<\/li>\n \u73af\u5f62\u7f13\u51b2\u533a<\/strong>\uff1a\u5bf9\u4e8e\u6d41\u5f0f\u5de5\u4f5c\u8d1f\u8f7d\u6216\u4f20\u5165 socket \u6570\u636e\u5305\uff0c\u4f7f\u7528\u56fa\u5b9a\u5927\u5c0f\u7684\u5faa\u73af\u7f13\u51b2\u533a\u3002\u73af\u5f62\u7f13\u51b2\u533a\u53ef\u4ee5\u8ba9\u5185\u5b58\u4f7f\u7528\u4fdd\u6301\u53ef\u9884\u6d4b\u4e14\u6709\u4e0a\u9650\u3002<\/li>\n<\/ol>\n \u4f7f\u7528\u5185\u5b58\u6c60\u80fd\u591f\u8ba9\u670d\u52a1\u5668\u5730\u5740\u7a7a\u95f4\u4fdd\u6301\u7a33\u5b9a\uff0c\u5e76\u51cf\u5c11\u5728\u6301\u7eed\u6570\u6708\u8fd0\u884c\u671f\u95f4\u4e0d\u53ef\u9884\u6d4b\u7684\u5185\u6838\u64cd\u4f5c\u3002<\/p>\n \n <\/div>\n<\/div>\n \u5982\u679c\u653e\u4efb\u4e0d\u7ba1\uff0c\u5185\u5b58\u788e\u7247\u5316\u4f1a\u6084\u7136\u4fb5\u8680\u670d\u52a1\u5668\u7684\u53ef\u7528\u6027\u3001\u7cfb\u7edf\u541e\u5410\u80fd\u529b\u4e0e\u8fd0\u884c\u53ef\u9760\u6027\u3002\u4f60\u5fc5\u987b\u4e3b\u52a8\u9632\u8303\u8fd9\u79cd\u9690\u853d\u7684\u6545\u969c\u6a21\u5f0f\u3002<\/p>\n \u4f60\u53ef\u4ee5\u901a\u8fc7\u4e09\u9879\u5173\u952e\u5b9e\u8df5\u6765\u4fdd\u62a4\u7cfb\u7edf\uff1a<\/p>\n \n \u4f7f\u7528 Linux \u539f\u751f\u8bca\u65ad\u5de5\u5177\u6301\u7eed\u8ddf\u8e2a\u5185\u5b58\u8fde\u7eed\u6027\u3002<\/li>\n \u7ec6\u81f4\u8c03\u4f18\u5185\u6838\u538b\u7f29\u53c2\u6570\uff0c\u5728\u540e\u53f0\u6574\u7406\u5f00\u9500\u4e0e\u4e1a\u52a1\u6027\u80fd\u4e4b\u95f4\u53d6\u5f97\u5e73\u8861\u3002<\/li>\n \u9488\u5bf9\u9ad8\u9891\u5206\u914d\u578b\u5de5\u4f5c\u8d1f\u8f7d\uff0c\u90e8\u7f72\u5982 jemalloc \u6216 tcmalloc \u4e4b\u7c7b\u7684\u4e13\u7528\u5206\u914d\u5668\u3002<\/li>\n<\/ul>\n \u5e38\u89c1\u95ee\u9898<\/strong><\/h2>\n \u5982\u4f55\u5feb\u901f\u68c0\u6d4b\u751f\u4ea7\u670d\u52a1\u5668\u4e0a\u7684\u5185\u5b58\u788e\u7247\u5316\uff1f<\/h3>\n \u4f60\u53ef\u4ee5\u4f7f\u7528 Linux \u539f\u751f\u547d\u4ee4\u68c0\u67e5 \/proc\/buddyinfo<\/code> \u6587\u4ef6\uff0c\u91cd\u70b9\u5173\u6ce8\u9ad8\u9636\u5185\u5b58\u5217\u8868\u4e2d\u7684\u6570\u503c\u662f\u5426\u504f\u5c0f\u3002\u6216\u8005\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7 dmesg<\/code> \u76d1\u63a7\u7cfb\u7edf\u65e5\u5fd7\u4e2d\u7684 page allocation failure \u8b66\u544a\u3002\u8fd9\u4e9b\u6307\u6807\u90fd\u80fd\u8fc5\u901f\u786e\u8ba4\u7269\u7406\u5730\u5740\u7a7a\u95f4\u662f\u5426\u5df2\u7ecf\u53d1\u751f\u788e\u7247\u5316\u3002<\/p>\n \u91cd\u542f\u670d\u52a1\u5668\u80fd\u5426\u5f7b\u5e95\u89e3\u51b3\u5185\u5b58\u788e\u7247\u5316\uff1f<\/h3>\n \u5173\u952e\u4e8b\u5b9e\uff1a<\/strong>\u91cd\u542f\u4f1a\u5b8c\u5168\u6e05\u7a7a\u7cfb\u7edf RAM\uff0c\u5e76\u91cd\u7f6e\u7269\u7406\u9875\u5206\u914d\u72b6\u6001\u3002<\/p><\/blockquote>\n \u7136\u800c\uff0c\u91cd\u542f\u4f1a\u5e26\u6765\u4e0d\u5fc5\u8981\u7684\u670d\u52a1\u4e2d\u65ad\u3002\u4f60\u66f4\u5e94\u8be5\u8c03\u4f18\u5185\u6838\u538b\u7f29\u53c2\u6570\uff0c\u6216\u90e8\u7f72\u50cf jemalloc<\/code> \u8fd9\u6837\u7684\u73b0\u4ee3\u5206\u914d\u5668\uff0c\u4ee5\u907f\u514d\u5728\u4e0d\u91cd\u542f\u751f\u4ea7\u8282\u70b9\u7684\u60c5\u51b5\u4e0b\u53cd\u590d\u51fa\u73b0\u788e\u7247\u5316\u95ee\u9898\u3002<\/p>\n \u4e3a\u4ec0\u4e48\u5728 RAM \u4ecd\u6709\u5269\u4f59\u65f6\uff0cOOM killer \u4ecd\u7136\u4f1a\u89e6\u53d1\uff1f<\/h3>\n \u5f53 Linux \u5185\u6838\u65e0\u6cd5\u4e3a\u9ad8\u9636\u5185\u5b58\u8bf7\u6c42\u627e\u5230\u8db3\u591f\u7684\u8fde\u7eed\u7269\u7406\u9875\u65f6\uff0cOOM killer \u5c31\u4f1a\u89e6\u53d1\u3002\u4e25\u91cd\u7684\u5916\u90e8\u788e\u7247\u5316\u4f1a\u628a\u5730\u5740\u7a7a\u95f4\u5207\u5272\u6210\u8bb8\u591a\u5b64\u7acb\u7684\u5c0f\u95f4\u9699\u3002\u4e00\u65e6\u76f4\u63a5\u538b\u7f29\u65e0\u6cd5\u5c06\u8fd9\u4e9b\u95f4\u9699\u6574\u5408\u6210\u8fde\u7eed\u7a7a\u95f4\uff0c\u5185\u6838\u5c31\u4f1a\u5728\u603b\u7a7a\u95f2 RAM \u4f9d\u7136\u8f83\u9ad8\u7684\u60c5\u51b5\u4e0b\u7ec8\u6b62\u8fdb\u7a0b\u3002<\/p>\n jemalloc \u4e0e glibc malloc \u5728\u8fd0\u884c\u5c42\u9762\u7684\u4e3b\u8981\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h3>\n \u6807\u51c6 glibc malloc<\/code> \u4ee5\u5168\u5c40\u65b9\u5f0f\u7ba1\u7406\u5806\u7a7a\u95f4\uff0c\u957f\u65f6\u95f4\u8fd0\u884c\u540e\u66f4\u5bb9\u6613\u9020\u6210\u4e25\u91cd\u788e\u7247\u5316\u3002\u76f8\u6bd4\u4e4b\u4e0b\uff0cjemalloc<\/code> \u4f7f\u7528\u7ebf\u7a0b\u4e13\u5c5e arena \u4e0e\u56fa\u5b9a\u5927\u5c0f bin\u3002\u8fd9\u79cd\u4e13\u95e8\u8bbe\u8ba1\u7684\u67b6\u6784\u80fd\u591f\u51cf\u5c11\u5206\u6563\u5206\u914d\uff0c\u5e76\u66f4\u9ad8\u6548\u5730\u5c06\u4e0d\u518d\u9700\u8981\u7684\u5185\u5b58\u9875\u5f52\u8fd8\u7ed9\u5185\u6838\u3002[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":" [vc_row][vc_column][vc_column_text css=””]\u4f60\u5728\u76d1\u63a7\u751f\u4ea7\u670d\u52a1\u5668\u65f6\uff0c\u660e\u660e\u770b\u5230\u8fd8\u6709\u6570 GB \u7684\u7a7a\u95f2 RAM\uff0c\u5e94\u7528\u5374\u7a81\u7136\u56e0\u5185\u5b58\u4e0d\u8db3\u9519\u8bef\u800c\u5d29\u6e83\uff0c\u6216\u51fa\u73b0\u4e25\u91cd\u7684\u5ef6\u8fdf\u5c16\u5cf0\u3002\u6570\u636e\u7684\u6301\u7eed\u5206\u914d\u4e0e\u91ca\u653e\uff0c\u4f1a\u968f\u7740\u65f6\u95f4\u63a8\u79fb\u9010\u6b65\u7834\u574f\u8fde\u7eed\u5185\u5b58\u5757\uff0c\u628a\u5b83\u4eec\u5207\u5206\u6210\u8bb8\u591a\u7ec6\u5c0f\u4e14\u96be\u4ee5\u5229\u7528\u7684\u788e\u7247\u3002 \u5de5\u7a0b\u5e08\u5c06\u8fd9\u79cd\u73b0\u8c61\u79f0\u4e3a\u5185\u5b58\u788e\u7247\u5316\u3002\u672a\u4f7f\u7528\u7684\u5b57\u8282\u4f1a\u6563\u843d\u5728\u7cfb\u7edf\u5730\u5740\u7a7a\u95f4\u4e2d\uff0c\u5373\u4f7f\u603b\u53ef\u7528\u5185\u5b58\u4ecd\u7136\u5f88\u9ad8\uff0cLinux \u5185\u6838\u4e5f\u53ef\u80fd\u65e0\u6cd5\u6ee1\u8db3\u8f83\u5927\u7684\u5185\u5b58\u7533\u8bf7\u3002 \u5185\u5b58\u788e\u7247\u5316\u7684\u8fd0\u4f5c\u673a\u5236 \u8981\u7406\u89e3\u670d\u52a1\u5668\u5185\u5b58\u662f\u5982\u4f55\u9010\u6b65\u201c\u52a3\u5316\u201d\u7684\uff0c\u53ef\u4ee5\u4ece\u4e24\u4e2a\u6838\u5fc3\u8fc7\u7a0b\u5165\u624b\uff1a\u5185\u90e8\u7533\u8bf7\u6548\u7387\u4ee5\u53ca\u5185\u6838\u7a7a\u95f4\u7ba1\u7406\u3002 \u5185\u90e8\u788e\u7247\u4e0e\u5916\u90e8\u788e\u7247 \u5185\u5b58\u5206\u914d\u95ee\u9898\u901a\u5e38\u5206\u4e3a\u4e24\u7c7b\uff1a \u788e\u7247\u7c7b\u578b \u4ea7\u751f\u65b9\u5f0f \u7cfb\u7edf\u5f71\u54cd \u5185\u90e8\u788e\u7247 \u4f60\u5206\u914d\u4e86\u5185\u5b58\u5757\uff0c\u4f46\u5b9e\u9645\u6570\u636e\u6ca1\u6709\u586b\u6ee1\u6574\u4e2a\u7a7a\u95f4\u3002 \u5757\u5185\u591a\u4f59\u7684\u7a7a\u95f2\u7a7a\u95f4\u4f1a\u88ab\u95f2\u7f6e\uff0c\u65e0\u6cd5\u4f7f\u7528\u3002 \u5916\u90e8\u788e\u7247 \u4f60\u957f\u65f6\u95f4\u6301\u7eed\u5730\u5206\u914d\u548c\u91ca\u653e\u52a8\u6001\u5bf9\u8c61\u3002 \u603b\u7a7a\u95f2\u5185\u5b58\u4f9d\u7136\u5f88\u591a\uff0c\u4f46\u7a7a\u95f4\u88ab\u4e0d\u53ef\u7528\u7684\u5c0f\u95f4\u9699\u5206\u5272\u5f00\u6765\u3002 \u5185\u90e8\u788e\u7247\u6d6a\u8d39\u7684\u662f\u5df2\u5206\u914d\u5757\u5185\u90e8\u7684\u5b57\u8282\uff1b\u5916\u90e8\u788e\u7247\u5219\u4f1a\u628a\u7a7a\u95f2 RAM \u6253\u6563\u6210\u8bb8\u591a\u5fae\u5c0f\u95f4\u9699\uff0c\u4ece\u800c\u963b\u788d\u8f83\u5927\u5185\u5b58\u5757\u7684\u5206\u914d\u3002 \u957f\u671f\u7f13\u5b58\u4e2d\u7684\u5806\u788e\u7247 \u957f\u65f6\u95f4\u8fd0\u884c\u7684\u5e94\u7528\u4f1a\u5728\u5185\u5b58\u7f13\u5b58\u4e2d\u5b58\u653e\u4e0d\u540c\u5927\u5c0f\u7684\u5bf9\u8c61\uff0c\u4ee5\u5b9e\u73b0\u5feb\u901f\u8bbf\u95ee\u3002\u4f60\u53ef\u80fd\u4f1a\u5c06\u7528\u6237\u4f1a\u8bdd\u3001\u52a8\u6001\u6570\u636e\u5e93\u67e5\u8be2\u7ed3\u679c\uff0c\u6216 API \u54cd\u5e94\u5b58\u653e\u5728 RAM \u4e2d\u3002 \u5e94\u7528\u4f1a\u4e0d\u65ad\u521b\u5efa\u548c\u5220\u9664\u8fd9\u4e9b\u5927\u5c0f\u4e0d\u4e00\u7684\u7f13\u5b58\u5bf9\u8c61\u3002\u8fd9\u6837\u7684\u6301\u7eed\u5faa\u73af\u4f1a\u628a\u5806\u7a7a\u95f4\u5207\u5272\u6210\u8bb8\u591a\u96f6\u6563\u7684\u5c0f\u578b\u7a7a\u95f2\u533a\u57df\u3002\u7ecf\u8fc7\u6570\u5468\u751a\u81f3\u6570\u6708\u540e\uff0c\u5373\u4f7f\u7cfb\u7edf\u4e2d\u4ecd\u7136\u6709\u6570 GB \u53ef\u7528 RAM\uff0c\u7a0b\u5e8f\u4e5f\u53ef\u80fd\u65e0\u6cd5\u4e3a\u65b0\u7684\u5927\u5bf9\u8c61\u627e\u5230\u4e00\u5757\u8fde\u7eed\u7a7a\u95f4\u3002 Linux \u5185\u6838\u9875\u5206\u914d\u5668\u7684\u673a\u5236 \u5f53\u5e94\u7528\u8bf7\u6c42\u5185\u5b58\u65f6\uff0c\u4f19\u4f34\u5206\u914d\u5668\uff08buddy allocator\uff09\u4f1a\u6309\u7167\u7279\u5b9a\u6d41\u7a0b\u5de5\u4f5c\uff1a \u68c0\u67e5\u76ee\u6807\u9636\u6570\u7a7a\u95f2\u94fe\u8868\uff1a\u5148\u5728\u4e0e\u6240\u9700\u5927\u5c0f\u5b8c\u5168\u5339\u914d\u7684 order \u7a7a\u95f2\u94fe\u8868\u4e2d\u67e5\u627e\u3002\u82e5\u5b58\u5728\u5408\u9002\u5757\uff0c\u7cfb\u7edf\u4f1a\u7acb\u5373\u5b8c\u6210\u5206\u914d\u3002 \u68c0\u67e5\u66f4\u9ad8\u9636\u94fe\u8868\uff1a\u5982\u679c\u76ee\u6807 order \u94fe\u8868\u4e3a\u7a7a\uff0c\u5c31\u7ee7\u7eed\u67e5\u627e\u66f4\u5927\u7684\u7a7a\u95f2\u5757\u94fe\u8868\u3002 \u9012\u5f52\u62c6\u5206\uff1a\u5c06\u8f83\u5927\u7684\u5757\u62c6\u5206\u4e3a\u4e24\u4e2a\u5927\u5c0f\u76f8\u7b49\u7684\u201c\u4f19\u4f34\u5757\uff08buddies\uff09\u201d\u3002\u5185\u6838\u4f7f\u7528\u5176\u4e2d\u4e00\u534a\u6ee1\u8db3\u8bf7\u6c42\uff0c\u5e76\u5c06\u5269\u4f59\u4e00\u534a\u653e\u56de\u8f83\u4f4e order \u7684\u7a7a\u95f2\u94fe\u8868\u3002 \u9ad8\u8d1f\u8f7d\u670d\u52a1\u5668\u4f1a\u4e0d\u65ad\u62c6\u5206\u8fd9\u4e9b\u5185\u5b58\u5757\uff0c\u968f\u7740\u8fd0\u884c\u65f6\u95f4\u589e\u957f\uff0c\u5185\u5b58\u788e\u7247\u5316\u4f1a\u8fdb\u4e00\u6b65\u52a0\u5267\u3002 \u5185\u5b58\u788e\u7247\u5316\u5bf9\u670d\u52a1\u5668\u7a33\u5b9a\u6027\u7684\u5f71\u54cd \u4e25\u91cd\u7684\u5185\u5b58\u788e\u7247\u5316\u4f1a\u5728\u4e0d\u77e5\u4e0d\u89c9\u4e2d\u6301\u7eed\u524a\u5f31\u7cfb\u7edf\u6027\u80fd\u3002\u4f60\u4e5f\u8bb8\u4f1a\u770b\u5230\u603b\u7a7a\u95f2 RAM \u4f9d\u7136\u5f88\u9ad8\uff0c\u4f46\u670d\u52a1\u5668\u5b9e\u9645\u4e0a\u5df2\u7ecf\u51fa\u73b0\u9690\u85cf\u7684\u6027\u80fd\u74f6\u9888\u4e0e\u8fd0\u884c\u4e0d\u7a33\u5b9a\u95ee\u9898\u3002 \u5206\u914d\u53d8\u6162\u4e0e RAM \u6d6a\u8d39 \u5f53\u5185\u5b58\u88ab\u5206\u88c2\u6210\u5927\u91cf\u7ec6\u5c0f\u4e14\u4e0d\u8fde\u7eed\u7684\u5757\u65f6\uff0c\u670d\u52a1\u5668\u5c31\u4f1a\u5931\u53bb\u9ad8\u6548\u6027\u3002Linux […]<\/p>\n Read More…<\/a><\/p>\n","protected":false},"author":1,"featured_media":33745,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[62],"tags":[12523,12524,12525,5839,2471],"class_list":["post-33748","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hong-kong-dedicated-server-sc","tag-linux-memory-management","tag-oom-errors","tag-memory-fragmentation","tag-memory-allocation-sc","tag-server-stability-sc"],"acf":[],"yoast_head":"\n