{"id":33226,"date":"2025-03-04T11:46:29","date_gmt":"2025-03-04T03:46:29","guid":{"rendered":"https:\/\/www.yunshan.net\/blog\/?p=33226"},"modified":"2025-03-04T11:46:29","modified_gmt":"2025-03-04T03:46:29","slug":"ebpf%e5%a6%82%e4%bd%95%e5%b8%ae%e5%8a%a9%e4%bc%98%e5%8c%96%e6%95%b0%e6%8d%ae%e5%ba%93%e6%80%a7%e8%83%bd%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.yunshan.net\/blog\/archives\/33226.html","title":{"rendered":"eBPF\u5982\u4f55\u5e2e\u52a9\u4f18\u5316\u6570\u636e\u5e93\u6027\u80fd\uff1f"},"content":{"rendered":"

\n

\"eBPF\u5982\u4f55\u5e2e\u52a9\u4f18\u5316\u6570\u636e\u5e93\u6027\u80fd\uff1f\"<\/p>\n<\/p>\n

\n

\u524d\u8a00<\/strong>
\n\u5728\u6570\u636e\u9a71\u52a8\u7684\u65f6\u4ee3\uff0c\u6570\u636e\u5e93\u6027\u80fd\u76f4\u63a5\u51b3\u5b9a\u4e86\u5e94\u7528\u7684\u54cd\u5e94\u901f\u5ea6\u4e0e\u7528\u6237\u4f53\u9a8c\u3002\u65e0\u8bba\u662f\u9ad8\u5e76\u53d1\u7684\u7535\u5546\u7cfb\u7edf\uff0c\u8fd8\u662f\u5b9e\u65f6\u5206\u6790\u7684\u6570\u636e\u4ed3\u5e93\uff0c\u6162\u67e5\u8be2\u3001\u9501\u7ade\u4e89\u6216I\/O\u74f6\u9888\u90fd\u53ef\u80fd\u5bfc\u81f4\u4e1a\u52a1\u635f\u5931\u3002\u4f20\u7edf\u7684\u6027\u80fd\u8c03\u4f18\u5de5\u5177\uff08\u5982pt-query-digest<\/code>\u6216EXPLAIN<\/code>\uff09\u867d\u7136\u6709\u6548\uff0c\u4f46\u5f80\u5f80\u5c40\u9650\u4e8e\u5e94\u7528\u5c42\u89c2\u6d4b\uff0c\u96be\u4ee5\u7a7f\u900f\u5185\u6838\u8fb9\u754c\u6355\u6349\u5e95\u5c42\u74f6\u9888<\/strong>\u3002\u800c\u8fd1\u5e74\u6765\uff0ceBPF<\/a>\uff08Extended Berkeley Packet Filter\uff09<\/strong>\u51ed\u501f\u5176\u5185\u6838\u7ea7\u53ef\u7f16\u7a0b\u6027<\/strong>\u548c\u96f6\u4fb5\u5165\u89c2\u6d4b\u80fd\u529b<\/strong>\uff0c\u6b63\u5728\u6210\u4e3a\u6570\u636e\u5e93\u6027\u80fd\u4f18\u5316\u7684\u201c\u624b\u672f\u5200\u201d\u3002\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8eBPF<\/a>\u5982\u4f55\u4ece\u7cfb\u7edf\u8c03\u7528\u3001\u8d44\u6e90\u8c03\u5ea6\u5230\u7f51\u7edc\u6808\u7b49\u7ef4\u5ea6\uff0c\u4e3a\u6570\u636e\u5e93\u6027\u80fd\u95ee\u9898\u63d0\u4f9b\u7cbe\u51c6\u7684\u8bca\u65ad\u4e0e\u4f18\u5316\u65b9\u6848\u3002<\/p>\n

\n

1. \u4ec0\u4e48\u662feBPF\uff1f\u91cd\u65b0\u5b9a\u4e49\u89c2\u6d4b\u7684\u8fb9\u754c<\/strong><\/h3>\n

eBPF\u662fLinux\u5185\u6838\u4e2d\u4e00\u4e2a\u9769\u547d\u6027\u7684\u6280\u672f\uff0c\u5b83\u5141\u8bb8\u5f00\u53d1\u8005\u5728\u4e0d\u4fee\u6539\u5185\u6838\u6e90\u7801<\/strong>\u3001\u4e0d\u91cd\u542f\u670d\u52a1<\/strong>\u7684\u524d\u63d0\u4e0b\uff0c\u52a8\u6001\u6ce8\u5165\u8f7b\u91cf\u7ea7\u7a0b\u5e8f\u5230\u5185\u6838\u6001\uff0c\u5b9e\u65f6\u6536\u96c6\u548c\u5206\u6790\u7cfb\u7edf\u884c\u4e3a\u3002\u4e0e\u4f20\u7edf\u7684\u6027\u80fd\u5206\u6790\u5de5\u5177\uff08\u5982strace<\/code>\u6216perf<\/code>\uff09\u76f8\u6bd4\uff0ceBPF\u7684\u4f18\u52bf\u5728\u4e8e\uff1a<\/p>\n

    \n
  • \u4f4e\u5f00\u9500<\/strong>\uff1aeBPF\u7a0b\u5e8f\u8fd0\u884c\u5728\u5185\u6838\u7684\u6c99\u7bb1\u4e2d\uff0c\u907f\u514d\u4e86\u4e0a\u4e0b\u6587\u5207\u6362\u7684\u5f00\u9500\uff1b\n<\/li>\n
  • \u5168\u94fe\u8def\u8986\u76d6<\/strong>\uff1a\u4ece\u7cfb\u7edf\u8c03\u7528\u3001\u6587\u4ef6\u64cd\u4f5c\u5230\u7f51\u7edc\u6570\u636e\u5305\uff0c\u5747\u53ef\u65e0\u7f1d\u8ffd\u8e2a\uff1b\n<\/li>\n
  • \u5b89\u5168\u53ef\u63a7<\/strong>\uff1a\u901a\u8fc7\u4e25\u683c\u7684\u9a8c\u8bc1\u673a\u5236\u9632\u6b62\u5185\u6838\u5d29\u6e83\u3002\n<\/li>\n<\/ul>\n

    \u5bf9\u4e8e\u6570\u636e\u5e93\u573a\u666f\uff0c\u8fd9\u610f\u5473\u7740\u5f00\u53d1\u8005\u53ef\u4ee5\u76f4\u63a5\u89c2\u6d4b\u5230\u67e5\u8be2\u6267\u884c\u65f6\u89e6\u53d1\u7684\u5185\u6838\u4e8b\u4ef6<\/strong>\uff08\u5982\u78c1\u76d8I\/O\u3001\u9501\u7ade\u4e89\u6216\u5185\u5b58\u5206\u914d\uff09\uff0c\u800c\u65e0\u9700\u4f9d\u8d56\u6570\u636e\u5e93\u81ea\u8eab\u63d0\u4f9b\u7684\u76d1\u63a7\u63a5\u53e3\u3002<\/p>\n

    \n

    2. \u6570\u636e\u5e93\u6027\u80fd\u7684\u56db\u5927\u6311\u6218\u4e0eeBPF\u7684\u7834\u5c40\u4e4b\u9053<\/strong><\/h3>\n

    2.1 \u6311\u6218\u4e00\uff1a\u67e5\u8be2\u5ef6\u8fdf\u7684\u201c\u9ed1\u76d2\u201d<\/strong><\/h4>\n

    \u5f53\u4e00\u6761SQL\u8bed\u53e5\u6267\u884c\u53d8\u6162\u65f6\uff0c\u4f20\u7edf\u65b9\u6cd5\u901a\u5e38\u901a\u8fc7\u6570\u636e\u5e93\u7684\u6162\u67e5\u8be2\u65e5\u5fd7\u5b9a\u4f4d\u95ee\u9898\u3002\u7136\u800c\uff0c\u6162\u65e5\u5fd7\u53ea\u80fd\u53cd\u6620\u6267\u884c\u65f6\u95f4\uff0c\u65e0\u6cd5\u89e3\u91ca\u65f6\u95f4\u6d88\u8017\u5728\u54ea\u4e2a\u73af\u8282<\/strong>\u3002\u4f8b\u5982\uff0c\u662f\u78c1\u76d8\u8bfb\u53d6\u8fc7\u6162\uff1f\u8fd8\u662f\u7f51\u7edc\u4f20\u8f93\u5b58\u5728\u5ef6\u8fdf\uff1f<\/p>\n

    eBPF\u89e3\u51b3\u65b9\u6848<\/strong>\uff1a
    \n\u901a\u8fc7\u5728\u5185\u6838\u4e2d\u8ffd\u8e2aread<\/code>\/write<\/code>\u7cfb\u7edf\u8c03\u7528\u3001\u5757\u8bbe\u5907I\/O\u4e8b\u4ef6\u4ee5\u53caTCP\u91cd\u4f20\u60c5\u51b5\uff0ceBPF\u53ef\u4ee5\u7ed8\u5236\u51fa\u7aef\u5230\u7aef\u7684\u67e5\u8be2\u6267\u884c\u8def\u5f84<\/strong>\u3002\u4f8b\u5982\uff1a<\/p>\n

      \n
    • \u4f7f\u7528BCC<\/code>\u5de5\u5177\u96c6\u4e2d\u7684biolatency<\/code>\u5206\u6790\u78c1\u76d8I\/O\u5ef6\u8fdf\u5206\u5e03\uff1b\n<\/li>\n
    • \u7ed3\u5408tcplife<\/code>\u76d1\u63a7\u6570\u636e\u5e93\u8fde\u63a5\u7684\u7f51\u7edc\u5f80\u8fd4\u65f6\u95f4\uff08RTT\uff09\u3002\n<\/li>\n<\/ul>\n

      \u8fd9\u4e9b\u6570\u636e\u80fd\u591f\u5e2e\u52a9\u533a\u5206\u201c\u6570\u636e\u5e93\u5185\u90e8\u8ba1\u7b97\u8017\u65f6\u201d\u4e0e\u201c\u5916\u90e8\u7cfb\u7edf\u8d44\u6e90\u74f6\u9888\u201d\uff0c\u4ece\u800c\u5feb\u901f\u5b9a\u4f4d\u4f18\u5316\u65b9\u5411\u3002<\/p>\n

      \n

      2.2 \u6311\u6218\u4e8c\uff1a\u9501\u7ade\u4e89\u7684\u9690\u5f62\u4ee3\u4ef7<\/strong><\/h4>\n

      \u6570\u636e\u5e93\u7684\u9501\u673a\u5236\uff08\u5982\u884c\u9501\u3001\u8868\u9501\uff09\u662f\u4fdd\u8bc1\u4e00\u81f4\u6027\u7684\u6838\u5fc3\uff0c\u4f46\u4e0d\u5f53\u7684\u9501\u7ade\u4e89\u53ef\u80fd\u5bfc\u81f4\u7ebf\u7a0b\u963b\u585e\uff0c\u751a\u81f3\u5f15\u53d1\u96ea\u5d29\u6548\u5e94\u3002\u5e38\u89c4\u7684SHOW ENGINE INNODB STATUS<\/code>\u547d\u4ee4\u867d\u7136\u80fd\u663e\u793a\u5f53\u524d\u9501\u72b6\u6001\uff0c\u4f46\u96be\u4ee5\u6355\u6349\u77ac\u65f6\u9501\u51b2\u7a81<\/strong>\u3002<\/p>\n

      eBPF\u89e3\u51b3\u65b9\u6848<\/strong>\uff1a
      \n\u901a\u8fc7\u6302\u94a9futex<\/code>\uff08\u5feb\u901f\u7528\u6237\u6001\u4e92\u65a5\u9501\uff09\u6216\u5185\u6838\u7684\u8c03\u5ea6\u5668\u4e8b\u4ef6\uff0ceBPF\u53ef\u4ee5\u5b9e\u65f6\u8bb0\u5f55\u9501\u7684\u7b49\u5f85\u65f6\u95f4\u4e0e\u6301\u6709\u8005\u4fe1\u606f\u3002\u4f8b\u5982\uff1a<\/p>\n

        \n
      • \u4f7f\u7528bpftrace<\/code>\u811a\u672c\u7edf\u8ba1\u7279\u5b9a\u9501\u7684\u4e89\u7528\u9891\u7387\uff1b\n<\/li>\n
      • \u901a\u8fc7\u5806\u6808\u8ddf\u8e2a\uff08Stack Trace\uff09\u5206\u6790\u54ea\u4e9b\u4ee3\u7801\u8def\u5f84\u9891\u7e41\u89e6\u53d1\u9501\u7ade\u4e89\u3002\n<\/li>\n<\/ul>\n

        \u67d0\u7535\u5546\u5e73\u53f0\u66fe\u5229\u7528\u6b64\u65b9\u6cd5\u53d1\u73b0\u8ba2\u5355\u8868\u7684\u884c\u9501\u5e73\u5747\u7b49\u5f85\u65f6\u95f4\u9ad8\u8fbe20ms<\/strong>\uff0c\u901a\u8fc7\u8c03\u6574\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u4e0e\u7d22\u5f15\u7b56\u7565\uff0c\u6700\u7ec8\u5c06\u541e\u5410\u91cf\u63d0\u5347\u4e8635%\u3002<\/p>\n

        \n

        2.3 \u6311\u6218\u4e09\uff1aI\/O\u74f6\u9888\u7684\u7cbe\u51c6\u5f52\u56e0<\/strong><\/h4>\n

        \u6570\u636e\u5e93\u7684I\/O\u6027\u80fd\u53d7\u591a\u79cd\u56e0\u7d20\u5f71\u54cd\uff1a\u6587\u4ef6\u7cfb\u7edf\u7f13\u5b58\u3001RAID\u914d\u7f6e\u3001\u751a\u81f3NVMe\u9a71\u52a8\u7a0b\u5e8f\u7684\u961f\u5217\u6df1\u5ea6\u3002\u4f20\u7edf\u7684iostat<\/code>\u5de5\u5177\u867d\u7136\u80fd\u63d0\u4f9b\u78c1\u76d8\u5229\u7528\u7387\u6570\u636e\uff0c\u4f46\u65e0\u6cd5\u5173\u8054I\/O\u64cd\u4f5c\u4e0e\u5177\u4f53\u7684\u6570\u636e\u5e93\u4e8b\u52a1<\/strong>\u3002<\/p>\n

        eBPF\u89e3\u51b3\u65b9\u6848<\/strong>\uff1a
        \n\u5728\u5757\u8bbe\u5907\u5c42\u6ce8\u5165\u8ffd\u8e2a\u7a0b\u5e8f\uff0c\u5c06\u6bcf\u4e2aI\/O\u8bf7\u6c42\u4e0e\u53d1\u8d77\u8fdb\u7a0b\u7684\u4e0a\u4e0b\u6587\uff08\u5982MySQL\u7ebf\u7a0bID\uff09\u5173\u8054\u3002\u4f8b\u5982\uff1a<\/p>\n

          \n
        • \u4f7f\u7528biosnoop<\/code>\u5de5\u5177\u5b9e\u65f6\u663e\u793a\u6bcf\u6b21\u78c1\u76d8I\/O\u7684\u5ef6\u8fdf\u4e0e\u5927\u5c0f\uff1b\n<\/li>\n
        • \u7ed3\u5408\u6570\u636e\u5e93\u7684\u67e5\u8be2ID\uff08\u5982MySQL\u7684THREAD_ID<\/code>\uff09\uff0c\u5efa\u7acbI\/O\u64cd\u4f5c\u4e0eSQL\u8bed\u53e5\u7684\u6620\u5c04\u5173\u7cfb\u3002\n<\/li>\n<\/ul>\n

          \u8fd9\u4e00\u65b9\u6cd5\u66fe\u5e2e\u52a9\u67d0\u91d1\u878d\u7cfb\u7edf\u53d1\u73b0\u6279\u91cf\u63d2\u5165\u64cd\u4f5c\u89e6\u53d1\u4e86\u8fc7\u591a\u7684\u5c0f\u5757\u968f\u673a\u5199<\/strong>\uff0c\u901a\u8fc7\u4f18\u5316innodb_flush_method<\/code>\u53c2\u6570\uff0c\u5c06\u5199\u541e\u5410\u91cf\u63d0\u5347\u4e862\u500d\u3002<\/p>\n

          \n

          2.4 \u6311\u6218\u56db\uff1a\u8d44\u6e90\u8c03\u5ea6\u7684\u201c\u76f2\u533a\u201d<\/strong><\/h4>\n

          \u6570\u636e\u5e93\u5b9e\u4f8b\u901a\u5e38\u4e0e\u591a\u4e2a\u5e94\u7528\u5171\u4eab\u670d\u52a1\u5668\u8d44\u6e90\uff0cCPU\u8c03\u5ea6\u3001\u5185\u5b58\u56de\u6536\u6216NUMA\u7b56\u7565\u7684\u914d\u7f6e\u4e0d\u5f53\u53ef\u80fd\u5bfc\u81f4\u6027\u80fd\u6296\u52a8\u3002\u5e38\u89c4\u7684top<\/code>\u6216vmstat<\/code>\u5de5\u5177\u4ec5\u80fd\u663e\u793a\u7cfb\u7edf\u7ea7\u6307\u6807\uff0c\u7f3a\u4e4f\u5bf9\u6570\u636e\u5e93\u5de5\u4f5c\u8d1f\u8f7d\u7684\u9488\u5bf9\u6027\u5206\u6790<\/strong>\u3002<\/p>\n

          eBPF\u89e3\u51b3\u65b9\u6848<\/strong>\uff1a
          \n\u901a\u8fc7\u8ffd\u8e2a\u5185\u6838\u7684\u8c03\u5ea6\u5668\uff08\u5982schedule<\/code>\u51fd\u6570\uff09\u4e0e\u5185\u5b58\u7ba1\u7406\u4e8b\u4ef6\uff08\u5982page_fault<\/code>\uff09\uff0ceBPF\u53ef\u4ee5\u56de\u7b54\u4ee5\u4e0b\u95ee\u9898\uff1a<\/p>\n

            \n
          • \u6570\u636e\u5e93\u7ebf\u7a0b\u662f\u5426\u56e0CPU\u4e89\u7528\u800c\u9891\u7e41\u4e0a\u4e0b\u6587\u5207\u6362\uff1f\n<\/li>\n
          • \u5185\u5b58\u56de\u6536\uff08kswapd\uff09\u662f\u5426\u5728\u67e5\u8be2\u9ad8\u5cf0\u671f\u89e6\u53d1\uff0c\u5bfc\u81f4\u5ef6\u8fdf\u6ce2\u52a8\uff1f\n<\/li>\n<\/ul>\n

            \u67d0\u4e91\u670d\u52a1\u5546\u5229\u7528runqlat<\/code>\u5de5\u5177\u53d1\u73b0\u6570\u636e\u5e93\u7684OLAP\u67e5\u8be2\u5bfc\u81f4CPU\u961f\u5217\u5ef6\u8fdf\u6fc0\u589e<\/strong>\uff0c\u6700\u7ec8\u901a\u8fc7cgroup\u9650\u5236OLAP\u8d44\u6e90\uff0c\u4fdd\u969c\u4e86OLTP\u4e1a\u52a1\u7684\u7a33\u5b9a\u6027\u3002<\/p>\n

            \n

            3. \u5b9e\u6218\u6848\u4f8b\uff1a\u7528eBPF\u4f18\u5316MySQL\u7684\u9501\u4e0eI\/O\u6027\u80fd<\/strong><\/h3>\n

            \u4ee5\u5f00\u6e90\u6570\u636e\u5e93MySQL\u4e3a\u4f8b\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5178\u578b\u7684\u4f18\u5316\u6d41\u7a0b\uff1a<\/p>\n

              \n
            1. \u9501\u5b9a\u95ee\u9898\u8303\u56f4<\/strong>\uff1a\u901a\u8fc7pt-query-digest<\/code>\u53d1\u73b0\u6162\u67e5\u8be2\u96c6\u4e2d\u5728\u8ba2\u5355\u66f4\u65b0\u64cd\u4f5c\uff1b\n<\/li>\n
            2. eBPF\u6df1\u5ea6\u5206\u6790<\/strong>\uff1a\n<\/li>\n<\/ol>\n
                \n
              • \u4f7f\u7528funclatency<\/code>\u8ffd\u8e2ainnodb<\/code>\u6a21\u5757\u7684\u9501\u51fd\u6570\uff08\u5982lock_rec_lock<\/code>\uff09\uff0c\u786e\u8ba4\u9501\u7b49\u5f85\u65f6\u95f4\u5360\u6bd4\uff1b\n<\/li>\n
              • \u901a\u8fc7bitesize<\/code>\u7edf\u8ba1\u78c1\u76d8\u5199\u64cd\u4f5c\u7684\u5c3a\u5bf8\u5206\u5e03\uff0c\u53d1\u73b0\u5927\u91cf\u5c0f\u4e8e4KB\u7684\u65e5\u5fd7\u5199\u5165\uff1b\n<\/li>\n<\/ul>\n
                  \n
                1. \u4f18\u5316\u63aa\u65bd<\/strong>\uff1a\n<\/li>\n<\/ol>\n
                    \n
                  • \u5c06\u4e8b\u52a1\u62c6\u5206\u4e3a\u5c0f\u6279\u91cf\u63d0\u4ea4\uff0c\u51cf\u5c11\u9501\u6301\u6709\u65f6\u95f4\uff1b<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

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