{"id":35221,"date":"2025-03-19T09:25:24","date_gmt":"2025-03-19T01:25:24","guid":{"rendered":"https:\/\/www.yunshan.net\/blog\/?p=35221"},"modified":"2025-03-19T09:25:24","modified_gmt":"2025-03-19T01:25:24","slug":"ebpf%e5%a6%82%e4%bd%95%e6%8f%90%e5%8d%87%e6%95%b0%e6%8d%ae%e5%ba%93%e7%9a%84%e6%9f%a5%e8%af%a2%e6%80%a7%e8%83%bd%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.yunshan.net\/blog\/archives\/35221.html","title":{"rendered":"eBPF\u5982\u4f55\u63d0\u5347\u6570\u636e\u5e93\u7684\u67e5\u8be2\u6027\u80fd\uff1f"},"content":{"rendered":"

\n

\"eBPF\u5982\u4f55\u63d0\u5347\u6570\u636e\u5e93\u7684\u67e5\u8be2\u6027\u80fd\uff1f\"<\/p>\n<\/p>\n

\n

\u5728\u6570\u636e\u9a71\u52a8\u7684\u65f6\u4ee3\uff0c\u6570\u636e\u5e93\u67e5\u8be2\u6027\u80fd\u7684\u6bcf\u4e00\u6beb\u79d2\u4f18\u5316\u90fd\u53ef\u80fd\u76f4\u63a5\u8f6c\u5316\u4e3a\u5546\u4e1a\u4ef7\u503c\u7684\u63d0\u5347\u3002\u4f20\u7edf\u4f18\u5316\u624b\u6bb5\u5982\u7d22\u5f15\u4f18\u5316\u3001\u67e5\u8be2\u91cd\u5199\u6216\u786c\u4ef6\u5347\u7ea7\uff0c\u5f80\u5f80\u4f34\u968f\u7740\u9ad8\u6602\u7684\u6210\u672c\u6216\u590d\u6742\u7684\u5de5\u7a0b\u6539\u9020\u3002\u800c\u8fd1\u5e74\u6765\uff0ceBPF<\/a>\uff08Extended Berkeley Packet Filter\uff09<\/strong>\u8fd9\u4e00\u5185\u6838\u7ea7\u6280\u672f\uff0c\u6b63\u6084\u7136\u6539\u53d8\u7740\u6027\u80fd\u8c03\u4f18\u7684\u6e38\u620f\u89c4\u5219\u2014\u2014\u5b83\u50cf\u4e00\u53f0”\u663e\u5fae\u955c”\uff0c\u8ba9\u5f00\u53d1\u8005\u80fd\u591f\u5728\u4e0d\u4fee\u6539\u6570\u636e\u5e93\u6e90\u7801\u7684\u60c5\u51b5\u4e0b\uff0c\u5b9e\u65f6\u89c2\u6d4b\u548c\u5e72\u9884\u5185\u6838\u884c\u4e3a<\/strong>\uff0c\u76f4\u51fb\u67e5\u8be2\u5ef6\u8fdf\u7684\u6839\u6e90\u95ee\u9898\u3002<\/p>\n

\n

\u4e00\u3001\u5185\u6838\u900f\u89c6\uff1aeBPF<\/a>\u91cd\u6784\u6570\u636e\u5e93\u6027\u80fd\u89c2\u6d4b\u7ef4\u5ea6<\/h3>\n

\u4f20\u7edf\u6570\u636e\u5e93\u76d1\u63a7\u5de5\u5177\uff08\u5982EXPLAIN ANALYZE<\/code>\u6216\u6162\u67e5\u8be2\u65e5\u5fd7\uff09\u4f9d\u8d56\u6570\u636e\u5e93\u81ea\u8eab\u7684\u7edf\u8ba1\u63a5\u53e3\uff0c\u5b58\u5728\u4e24\u5927\u76f2\u533a\uff1a\u5185\u6838\u6001\u8d44\u6e90\u7ade\u4e89<\/strong>\u548c\u8de8\u7cfb\u7edf\u8c03\u7528\u94fe\u8def\u7684\u6027\u80fd\u635f\u8017<\/strong>\u3002\u4f8b\u5982\uff0c\u5f53\u591a\u4e2a\u67e5\u8be2\u7ebf\u7a0b\u4e89\u62a2CPU\u7f13\u5b58\u65f6\uff0c\u6216\u9891\u7e41\u7684\u78c1\u76d8I\/O\u56e0\u7cfb\u7edf\u8c03\u7528\u9677\u5165\u5185\u6838\u6001\u65f6\uff0c\u7528\u6237\u6001\u5de5\u5177\u96be\u4ee5\u6355\u6349\u5230\u8fd9\u4e9b\u7ec6\u5fae\u7684\u6ce2\u52a8\u3002<\/p>\n

eBPF\u901a\u8fc7\u52a8\u6001\u63d2\u6869\u6280\u672f<\/strong>\uff0c\u5728Linux\u5185\u6838\u4e2d\u6ce8\u5165\u8f7b\u91cf\u7ea7\u7a0b\u5e8f\uff0c\u76f4\u63a5\u6355\u83b7\u4ee5\u4e0b\u5173\u952e\u6570\u636e\uff1a<\/p>\n

    \n
  • \u7cfb\u7edf\u8c03\u7528\u9891\u7387<\/strong>\uff08\u5982read\/write<\/code>\u5728B+\u6811\u904d\u5386\u4e2d\u7684\u5206\u5e03\uff09\n<\/li>\n
  • \u4e0a\u4e0b\u6587\u5207\u6362\u8017\u65f6<\/strong>\uff08\u53cd\u6620\u7ebf\u7a0b\u8c03\u5ea6\u5bf9OLTP\u4e8b\u52a1\u7684\u5f71\u54cd\uff09\n<\/li>\n
  • \u5185\u5b58\u9875\u9519\u8bef\u7387<\/strong>\uff08\u66b4\u9732JOIN\u64cd\u4f5c\u4e2d\u7684\u7f13\u5b58\u5931\u6548\u95ee\u9898\uff09\n<\/li>\n<\/ul>\n

    \u67d0\u4e91\u6570\u636e\u5e93\u5382\u5546\u7684\u6d4b\u8bd5\u6570\u636e\u663e\u793a\uff0c\u901a\u8fc7eBPF\u8ffd\u8e2aMySQL\u7684InnoDB<\/code>\u5b58\u50a8\u5f15\u64ce\uff0c\u6210\u529f\u5b9a\u4f4d\u523032%\u7684\u67e5\u8be2\u5ef6\u8fdf\u6e90\u4e8e\u672a\u88ab\u8bb0\u5f55\u7684\u9501\u7ade\u4e89\u4e8b\u4ef6<\/strong>\u3002\u8fd9\u79cd\u7ec6\u7c92\u5ea6\u7684\u53ef\u89c1\u6027\uff0c\u8ba9\u4f18\u5316\u4ece”\u731c\u6d4b-\u9a8c\u8bc1”\u6a21\u5f0f\u5347\u7ea7\u4e3a”\u7cbe\u51c6\u624b\u672f”\u6a21\u5f0f\u3002<\/p>\n

    \n

    \u4e8c\u3001\u96f6\u4fb5\u5165\u4f18\u5316\uff1a\u7ed5\u8fc7\u4f20\u7edf\u65b9\u6848\u7684\u4e09\u91cd\u58c1\u5792<\/h3>\n

    \u4f20\u7edf\u6027\u80fd\u8c03\u4f18\u5e38\u9762\u4e34\u4e09\u5927\u56f0\u5883\uff1a\u9700\u8981\u505c\u673a\u90e8\u7f72<\/strong>\u3001\u5f15\u5165\u989d\u5916\u6027\u80fd\u635f\u8017<\/strong>\u3001\u4e0e\u6570\u636e\u5e93\u7248\u672c\u5f3a\u8026\u5408<\/strong>\u3002eBPF\u7684\u521b\u65b0\u4e4b\u5904\u5728\u4e8e\uff0c\u5b83\u6784\u5efa\u4e86\u4e00\u4e2a\u5b89\u5168\u6267\u884c\u7684\u6c99\u7bb1\u73af\u5883<\/strong>\uff0c\u4f7f\u5f97\u4f18\u5316\u624b\u6bb5\u5177\u5907\u4e09\u5927\u7279\u6027\uff1a<\/p>\n

      \n
    1. \n

      \u5b9e\u65f6\u751f\u6548<\/strong>
      \n\u901a\u8fc7BPF_PROG_ATTACH<\/code>\u673a\u5236\u52a8\u6001\u52a0\u8f7d\u63a2\u6d4b\u7a0b\u5e8f\uff0c\u65e0\u9700\u91cd\u542f\u6570\u636e\u5e93\u670d\u52a1\u3002\u4f8b\u5982\uff0c\u5728Redis\u96c6\u7fa4\u4e2d\u52a8\u6001\u6ce8\u5165\u5e26\u5bbd\u9650\u6d41\u7a0b\u5e8f\uff0c\u53ef\u5373\u65f6\u7f13\u89e3\u70ed\u70b9Key\u5f15\u53d1\u7684\u7f51\u7edc\u62e5\u585e\u3002<\/p>\n<\/li>\n

    2. \n

      \u4f4e\u5f00\u9500\u91c7\u6837<\/strong>
      \neBPF\u7a0b\u5e8f\u91c7\u7528perf_event<\/code>\u73af\u5f62\u7f13\u51b2\u533a\u4e0e\u7528\u6237\u6001\u5f02\u6b65\u901a\u4fe1\uff0cCPU\u5360\u7528\u7387\u53ef\u63a7\u5236\u57282%\u4ee5\u5185\u3002\u67d0\u7535\u5546\u5e73\u53f0\u4f7f\u7528BCC\u5de5\u5177\u96c6<\/code>\u4e2d\u7684dbslower<\/code>\u5de5\u5177\uff0c\u6301\u7eed\u76d1\u63a7MongoDB\u67e5\u8be2\u8017\u65f6\uff0c\u91c7\u6837\u7cbe\u5ea6\u8fbe\u5230\u5fae\u79d2\u7ea7\uff0c\u800c\u6027\u80fd\u635f\u8017\u4ec51.73%\u3002<\/p>\n<\/li>\n

    3. \n

      \u7248\u672c\u65e0\u5173\u6027<\/strong>
      \n\u5185\u6838ABI\u7684\u7a33\u5b9a\u6027\u4fdd\u8bc1\u4e86eBPF\u7a0b\u5e8f\u8de8\u7248\u672c\u517c\u5bb9\u3002Oracle DBA\u5229\u7528bpftrace<\/code>\u811a\u672c\u7edf\u4e00\u76d1\u63a712c\u523021c\u591a\u4e2a\u7248\u672c\u7684SQL\u6267\u884c\u8ba1\u5212\uff0c\u51cf\u5c1175%\u7684\u9002\u914d\u6210\u672c\u3002<\/p>\n<\/li>\n<\/ol>\n

      \n

      \u4e09\u3001\u7f51\u7edc\u6808\u52a0\u901f\uff1a\u4ece\u534f\u8bae\u89e3\u6790\u5230\u667a\u80fd\u8def\u7531<\/h3>\n

      \u6570\u636e\u5e93\u67e5\u8be2\u6027\u80fd\u7684\u74f6\u9888\u5f80\u5f80\u4e0d\u5728SQL\u5f15\u64ce\u672c\u8eab\uff0c\u800c\u9690\u85cf\u5728\u5e95\u5c42\u7f51\u7edc\u534f\u8bae\u6808\u4e2d\u3002eBPF\u901a\u8fc7XDP\uff08Express Data Path\uff09<\/strong>\u548cTC\uff08Traffic Control\uff09<\/code>\u94a9\u5b50\uff0c\u91cd\u5851\u4e86\u6570\u636e\u5904\u7406\u6d41\u6c34\u7ebf\uff1a<\/p>\n

        \n
      • \n

        \u96f6\u62f7\u8d1d\u62a5\u6587\u5904\u7406<\/strong>
        \n\u5728XDP\u5c42\u76f4\u63a5\u89e3\u6790MySQL\u534f\u8bae\u5934\uff0c\u901a\u8fc7bpf_redirect<\/code>\u51fd\u6570\u5c06\u7279\u5b9a\u6a21\u5f0f\u7684\u67e5\u8be2\uff08\u5982\u5168\u8868\u626b\u63cf\u8bf7\u6c42\uff09\u8f6c\u53d1\u5230\u4e13\u7528\u8ba1\u7b97\u8282\u70b9\uff0c\u51cf\u5c11\u5185\u6838\u534f\u8bae\u6808\u5904\u7406\u5ef6\u8fdf\u3002\u6d4b\u8bd5\u8868\u660e\uff0c\u8be5\u65b9\u6848\u4f7fClickHouse\u7684\u5206\u5e03\u5f0f\u67e5\u8be2\u541e\u5410\u91cf\u63d0\u53474.8\u500d\u3002<\/p>\n<\/li>\n

      • \n

        \u667a\u80fd\u62e5\u585e\u63a7\u5236<\/strong>
        \n\u4f7f\u7528BPF_PROG_TYPE_CGROUP_SKB<\/code>\u7a0b\u5e8f\u5b9e\u73b0\u81ea\u5b9a\u4e49\u62e5\u585e\u7b97\u6cd5\u3002\u5728PostgreSQL\u4e3b\u4ece\u590d\u5236\u573a\u666f\u4e2d\uff0c\u6839\u636eWAL\u65e5\u5fd7\u5927\u5c0f\u52a8\u6001\u8c03\u6574TCP\u7a97\u53e3\u53c2\u6570\uff0c\u4f7f\u540c\u6b65\u5ef6\u8fdf\u964d\u4f4e62%\u3002<\/p>\n<\/li>\n

      • \n

        \u534f\u8bae\u5c42\u8fc7\u6ee4<\/strong>
        \n\u5229\u7528eBPF\u7684TLS\u89e3\u5bc6\u80fd\u529b\uff08\u5982SSL\/TLS\u7684bpf_sock_ops<\/code>\u94a9\u5b50\uff09\uff0c\u5728\u4e0d\u89e3\u5bc6\u6574\u4f53\u6d41\u91cf\u7684\u60c5\u51b5\u4e0b\u8bc6\u522b\u654f\u611f\u67e5\u8be2\uff0c\u5b9e\u73b0\u5b89\u5168\u5ba1\u8ba1\u4e0e\u6027\u80fd\u4f18\u5316\u7684\u5e73\u8861\u3002<\/p>\n<\/li>\n<\/ul>\n

        \n

        \u56db\u3001\u5b58\u50a8\u5f15\u64ce\u534f\u540c\uff1a\u4eceI\/O\u8c03\u5ea6\u5230\u7f13\u5b58\u9884\u6d4b<\/h3>\n

        \u73b0\u4ee3\u6570\u636e\u5e93\u7684\u5b58\u50a8\u5f15\u64ce\uff08\u5982RocksDB\u3001WiredTiger\uff09\u4e25\u91cd\u4f9d\u8d56\u64cd\u4f5c\u7cfb\u7edf\u7ea7\u7f13\u5b58\u3002eBPF\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u4f18\u5316\u5b58\u50a8\u8bbf\u95ee\u6a21\u5f0f\uff1a<\/p>\n

          \n
        1. \n

          I\/O\u8def\u5f84\u8ffd\u8e2a<\/strong>
          \n\u6302\u94a9vfs_read\/vfs_write<\/code>\u51fd\u6570\uff0c\u7ed8\u5236\u6bcf\u4e2a\u67e5\u8be2\u7684\u6587\u4ef6\u8bbf\u95ee\u70ed\u529b\u56fe<\/strong>\u3002\u67d0\u56e2\u961f\u53d1\u73b0\uff0c\u8d85\u8fc740%\u7684OLAP\u67e5\u8be2\u65f6\u95f4\u6d6a\u8d39\u5728\u968f\u673a\u8bfb\u53d6\u5c0f\u6587\u4ef6\u4e0a\uff0c\u901a\u8fc7\u91cd\u7ec4\u6570\u636e\u5e03\u5c40\u540e\uff0c\u67e5\u8be2\u901f\u5ea6\u63d0\u53473.2\u500d\u3002<\/p>\n<\/li>\n

        2. \n

          \u9884\u53d6\u7b56\u7565\u4f18\u5316<\/strong>
          \n\u7528BPF_PROG_TYPE_KPROBE<\/code>\u76d1\u63a7readahead<\/code>\u7cfb\u7edf\u8c03\u7528\uff0c\u52a8\u6001\u8c03\u6574\u9884\u53d6\u7a97\u53e3\u5927\u5c0f\u3002\u5728Ceph\u5b58\u50a8\u7684RBD\u5757\u8bbe\u5907\u573a\u666f\u4e2d\uff0c\u8be5\u65b9\u6848\u4f7f\u987a\u5e8f\u626b\u63cf\u6027\u80fd\u63a5\u8fd1\u88f8\u76d8\u6c34\u5e73\u3002<\/p>\n<\/li>\n

        3. \n

          \u7f13\u5b58\u4e89\u7528\u5206\u6790<\/strong>
          \n\u901a\u8fc7slabtrace<\/code>\u5de5\u5177\u8ffd\u8e2a\u5185\u5b58\u5206\u914d\u5668\u884c\u4e3a\uff0c\u8bc6\u522b\u51fa\u9891\u7e41\u6362\u51fa\u7684\u9875\u9762\u3002\u5c06Redis\u7684\u6301\u4e45\u5316\u5b50\u8fdb\u7a0b\u7ed1\u5b9a\u5230\u72ec\u7acbCPU\u6838\uff0c\u51cf\u5c11fork()<\/code>\u64cd\u4f5c\u5bfc\u81f4\u7684\u7f13\u5b58\u6c61\u67d3\uff0c\u4f7fQPS\u6ce2\u52a8\u7387\u4ece15%\u964d\u81f33%\u3002<\/p>\n<\/li>\n<\/ol>\n

          \n

          \u4e94\u3001\u672a\u6765\u6218\u573a\uff1aeBPF\u4e0e\u6570\u636e\u5e93\u7684\u6df1\u5ea6\u534f\u540c<\/h3>\n

          \u968f\u7740\u6280\u672f\u6f14\u8fdb\uff0ceBPF\u4e0e\u6570\u636e\u5e93\u7684\u7ed3\u5408\u6b63\u8d70\u5411\u66f4\u6df1\u5c42\u6b21\u7684\u67b6\u6784\u878d\u5408\uff1a<\/p>\n

            \n
          • \n

            \u667a\u80fd\u7f16\u8bd1\u6267\u884c<\/strong>
            \n\u5c06eBPF\u7a0b\u5e8f\u5d4c\u5165\u67e5\u8be2\u8ba1\u5212\u5668\uff0c\u6839\u636e\u5b9e\u65f6\u8d1f\u8f7d\u52a8\u6001\u751f\u6210\u6700\u4f18\u6267\u884c\u8def\u5f84\u3002\u4f8b\u5982\uff0c\u5bf9\u9ad8\u5e76\u53d1\u7684\u70b9\u67e5\u8be2\u81ea\u52a8\u542f\u7528\u65c1\u8def\u5185\u6838\u534f\u8bae\u6808\u3002<\/p>\n<\/li>\n

          • \n

            \u786c\u4ef6\u5378\u8f7d\u52a0\u901f<\/strong>
            \neBPF\u7684\u786c\u4ef6\u5378\u8f7d\u7279\u6027\uff08\u5982\u7f51\u5361BPF Offload\uff09\u53ef\u4e0eSmartNIC\u7ed3\u5408\uff0c\u5b9e\u73b0\u67e5\u8be2\u89e3\u6790\u7684\u786c\u4ef6\u7ea7\u52a0\u901f\u3002\u5fae\u8f6fAzure\u5df2\u5728\u5176FPGA\u52a0\u901f\u6570\u636e\u5e93\u4e2d\u5e94\u7528\u8be5\u6280\u672f\u3002<\/p>\n<\/li>\n

          • \n

            \u5b89\u5168\u4e0e\u6027\u80fd\u7edf\u4e00<\/strong>
            \n\u901a\u8fc7LSM\uff08Linux Security Module\uff09\u94a9\u5b50\u5728\u6267\u884c\u67e5\u8be2\u65f6\u52a8\u6001\u5b9e\u65bd\u8bbf\u95ee\u63a7\u5236\uff0c\u6d88\u9664\u4f20\u7edf\u9274\u6743\u673a\u5236\u7684\u6027\u80fd\u635f\u8017\u3002MongoDB\u4f01\u4e1a\u7248\u5df2\u96c6\u6210\u8be5\u65b9\u6848\uff0c\u4f7fRBAC\u9274\u6743\u5ef6\u8fdf\u964d\u4f4e\u81f3\u5fae\u79d2\u7ea7\u3002<\/p>\n<\/li>\n<\/ul>\n

            \n

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