{"id":37347,"date":"2025-04-18T11:16:08","date_gmt":"2025-04-18T03:16:08","guid":{"rendered":"https:\/\/www.yunshan.net\/blog\/?p=37347"},"modified":"2025-04-18T11:16:08","modified_gmt":"2025-04-18T03:16:08","slug":"ebpf%e5%9c%a8%e5%b5%8c%e5%85%a5%e5%bc%8f%e7%b3%bb%e7%bb%9f%e5%bc%80%e5%8f%91%e4%b8%ad%e7%9a%84%e5%ae%9e%e7%94%a8%e6%8c%87%e5%8d%97%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.yunshan.net\/blog\/archives\/37347.html","title":{"rendered":"eBPF\u5728\u5d4c\u5165\u5f0f\u7cfb\u7edf\u5f00\u53d1\u4e2d\u7684\u5b9e\u7528\u6307\u5357\uff1f"},"content":{"rendered":"

\n

\"eBPF\u5728\u5d4c\u5165\u5f0f\u7cfb\u7edf\u5f00\u53d1\u4e2d\u7684\u5b9e\u7528\u6307\u5357\uff1f\"<\/p>\n<\/p>\n

\n

\u5728\u4e07\u7269\u4e92\u8054\u7684\u65f6\u4ee3\u6d6a\u6f6e\u4e2d\uff0c\u5d4c\u5165\u5f0f\u7cfb\u7edf\u6b63\u4ece\u5c01\u95ed\u7684\u5355\u4e00\u529f\u80fd\u8bbe\u5907\uff0c\u9010\u6e10\u6f14\u53d8\u4e3a\u652f\u6491\u667a\u80fd\u5bb6\u5c45\u3001\u5de5\u4e1a\u7269\u8054\u7f51\u3001\u81ea\u52a8\u9a7e\u9a76\u7b49\u9886\u57df\u7684\u6838\u5fc3\u67a2\u7ebd\u3002\u5f00\u53d1\u8005\u4eec\u65e2\u8981\u5e94\u5bf9\u5185\u5b58\u4e0d\u8db3\u3001\u7b97\u529b\u6709\u9650\u7684\u786c\u4ef6\u7ea6\u675f\uff0c\u53c8\u9700\u6ee1\u8db3\u5b9e\u65f6\u54cd\u5e94\u3001\u5b89\u5168\u9632\u62a4\u7b49\u4e25\u82db\u9700\u6c42\u3002\u4f20\u7edf\u5de5\u5177\u94fe\u4e2d\uff0c\u7cfb\u7edf\u7ea7\u8c03\u8bd5\u5f80\u5f80\u4f9d\u8d56\u4fb5\u5165\u5f0f\u63d2\u6869\u6216\u65e5\u5fd7\u6253\u5370\uff0c\u8fd9\u79cd”\u5916\u79d1\u624b\u672f\u5f0f”\u7684\u89c2\u6d4b\u624b\u6bb5\uff0c\u4e0d\u4ec5\u4f1a\u7834\u574f\u7cfb\u7edf\u5b9e\u65f6\u6027\uff0c\u66f4\u53ef\u80fd\u56e0\u989d\u5916\u8d44\u6e90\u6d88\u8017\u5bfc\u81f4\u8bbe\u5907\u6027\u80fd\u96ea\u5d29\u3002\u800ceBPF<\/a>\uff08Extended Berkeley Packet Filter\uff09\u6280\u672f\u7684\u51fa\u73b0\uff0c\u6070\u4f3c\u4e3a\u5d4c\u5165\u5f0f\u5f00\u53d1\u6253\u5f00\u4e86\u4e00\u6247\u5168\u666f\u5929\u7a97\uff0c\u8ba9\u7cfb\u7edf\u89c2\u6d4b\u4ece\u76f2\u4eba\u6478\u8c61\u5347\u7ea7\u4e3aCT\u626b\u63cf\u3002<\/strong><\/p>\n

\u4e00\u3001\u5d4c\u5165\u5f0f\u4e16\u754c\u7684\u89c2\u6d4b\u9769\u547d\uff1a\u91cd\u65b0\u8ba4\u8bc6eBPF<\/a><\/h3>\n

\u4f5c\u4e3aLinux\u5185\u6838\u7684\u8d85\u7ea7\u89c2\u6d4b\u5668\uff0ceBPF\u901a\u8fc7\u6c99\u7bb1\u673a\u5236\u5728\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u8fd0\u884c\u9a8c\u8bc1\u8fc7\u7684\u5b57\u8282\u7801\uff0c\u5b9e\u73b0\u4e86\u96f6\u4ee3\u7801\u4fee\u6539\u7684\u52a8\u6001\u8ffd\u8e2a<\/strong>\u3002\u76f8\u8f83\u4e8e\u4f20\u7edf\u65b9\u6848\uff0c\u5176\u72ec\u7279\u4ef7\u503c\u4f53\u73b0\u5728\u4e09\u4e2a\u7ef4\u5ea6\uff1a<\/p>\n

    \n
  • \u8f7b\u91cf\u5316\u8fd0\u884c<\/strong>\uff1a\u7a0b\u5e8f\u5360\u7528\u5185\u5b58\u901a\u5e38\u5c0f\u4e8e512KB\uff0cCPU\u5f00\u9500\u63a7\u5236\u57285%\u4ee5\u5185\uff0c\u5b8c\u7f8e\u9002\u914d\u8d44\u6e90\u53d7\u9650\u73af\u5883\n<\/li>\n
  • \u5b89\u5168\u6c99\u7bb1<\/strong>\uff1a\u901a\u8fc7\u9a8c\u8bc1\u5668\u963b\u6b62\u975e\u6cd5\u5185\u5b58\u8bbf\u95ee\uff0c\u907f\u514d\u56e0\u89c2\u6d4b\u5bfc\u81f4\u7cfb\u7edf\u5d29\u6e83\n<\/li>\n
  • \u5168\u6808\u53ef\u89c6<\/strong>\uff1a\u4ece\u786c\u4ef6\u4e2d\u65ad\u5230\u5e94\u7528\u903b\u8f91\uff0c\u6784\u5efa\u8de8\u5c42\u7ea7\u7684\u89c2\u6d4b\u77e9\u9635\n<\/li>\n<\/ul>\n

    \u5728\u6811\u8393\u6d3e\u7b49ARM\u5f00\u53d1\u677f\u7684\u5b9e\u6d4b\u4e2d\uff0c\u4f7f\u7528eBPF\u91c7\u96c6\u7f51\u7edc\u541e\u5410\u91cf\u6570\u636e\u65f6\uff0c\u7cfb\u7edf\u5ef6\u8fdf\u6ce2\u52a8\u4ece\u4f20\u7edf\u65b9\u6848\u7684\u00b115%\u964d\u81f3\u00b13%\uff0c\u5185\u5b58\u5360\u7528\u51cf\u5c1180%\u3002\u8fd9\u79cd\u6548\u7387\u8dc3\u5347\uff0c\u8ba9\u5d4c\u5165\u5f0f\u8bbe\u5907\u9996\u6b21\u5177\u5907\u751f\u4ea7\u73af\u5883\u5b9e\u65f6\u8bca\u65ad<\/strong>\u7684\u53ef\u80fd\u6027\u3002<\/p>\n

    \u4e8c\u3001\u56db\u5927\u5b9e\u6218\u573a\u666f\u7834\u89e3\u5f00\u53d1\u56f0\u5c40<\/h3>\n

    1. \u6027\u80fd\u74f6\u9888\u7684\u663e\u5fae\u955c<\/h4>\n

    \u67d0\u667a\u80fd\u5bb6\u5c45\u5382\u5546\u66fe\u906d\u9047\u8bbe\u5907\u5076\u53d1\u6027\u5361\u987f\uff0c\u4f20\u7edf\u8c03\u8bd5\u624b\u6bb5\u96be\u4ee5\u6355\u6349\u77ac\u65f6\u5f02\u5e38\u3002\u901a\u8fc7\u90e8\u7f72eBPF\u7a0b\u5e8f\uff1a<\/p>\n

    SEC("kprobe\/handle_irq")  \r\nint trace_irq_handler(struct pt_regs *ctx) {  \r\nu64 ts = bpf_ktime_get_ns();  \r\nbpf_map_update_elem(&irq_timestamps, &pid, &ts, BPF_ANY);  \r\nreturn 0;  \r\n}  \r\n<\/code><\/pre>\n
    \u8fd9\u6bb5\u4ee3\u7801\u4ee5\u7eb3\u79d2\u7ea7\u7cbe\u5ea6\u8ffd\u8e2a\u4e2d\u65ad\u5904\u7406\u5ef6\u8fdf\uff0c\u6700\u7ec8\u5b9a\u4f4d\u5230WiFi\u9a71\u52a8\u4e2d\u672a\u4f18\u5316\u7684\u81ea\u65cb\u9501\u7ade\u4e89\u3002\u5c06\u4e2d\u65ad\u54cd\u5e94\u65f6\u95f4\u7684P99\u6307\u6807\u4ece230ms\u538b\u7f29\u81f328ms<\/strong>\uff0c\u8bbe\u5907\u6d41\u7545\u5ea6\u663e\u8457\u63d0\u5347\u3002<\/p>\n
    2. \u5185\u5b58\u6cc4\u6f0f\u7684\u6355\u9f20\u5939<\/h4>\n
    \u5728\u91c7\u7528\u81ea\u5b9a\u4e49\u5185\u5b58\u5206\u914d\u5668\u7684\u5de5\u4e1a\u63a7\u5236\u7cfb\u7edf\u4e2d\uff0c\u5f00\u53d1\u8005\u501f\u52a9eBPF\u7684mmap<\/code>\u8ffd\u8e2a\u70b9\uff1a<\/p>\n
    SEC("tracepoint\/syscalls\/sys_enter_mmap")  \r\nint trace_mmap_enter(struct trace_event_raw_sys_enter* ctx) {  \r\nu64 pid = bpf_get_current_pid_tgid() >> 32;  \r\nu64 size = ctx->args[1];  \r\nbpf_map_update_elem(&mem_usage, &pid, &size, BPF_ANY);  \r\nreturn 0;  \r\n}  \r\n<\/code><\/pre>\n
    \u901a\u8fc7\u6784\u5efaPID\u4e0e\u5185\u5b58\u5206\u914d\u7684\u6620\u5c04\u5173\u7cfb\uff0c\u4e24\u5468\u5185\u6355\u83b73\u5904\u672a\u91ca\u653e\u7684DMA\u7f13\u51b2\u533a\uff0c\u5c06\u7cfb\u7edf\u6301\u7eed\u8fd0\u884c\u65f6\u95f4\u4ece72\u5c0f\u65f6\u5ef6\u957f\u81f3800\u5c0f\u65f6<\/strong>\u3002<\/p>\n
    3. \u7f51\u7edc\u5b89\u5168\u7684\u667a\u80fd\u54e8\u5175<\/h4>\n
    \u9488\u5bf9\u7269\u8054\u7f51\u8bbe\u5907\u5e38\u89c1\u7684DDoS\u653b\u51fb\uff0c\u67d0\u8f66\u8054\u7f51\u7f51\u5173\u90e8\u7f72\u7684eBPF\u7a0b\u5e8f\u5b9e\u73b0\uff1a<\/p>\n
      \n
    • \u5b9e\u65f6\u7edf\u8ba1\u6bcf\u4e2aIP\u7684SYN\u8bf7\u6c42\u901f\u7387\n<\/li>\n
    • \u81ea\u52a8\u62e6\u622a\u5f02\u5e38\u6d41\u91cf\uff08>500\u6b21\/\u79d2\uff09\n<\/li>\n
    • \u751f\u6210\u653b\u51fb\u8def\u5f84\u70ed\u529b\u56fe\n<\/li>\n<\/ul>\n
      \u8fd9\u5957\u65b9\u6848\u5728ARM Cortex-A53\u5904\u7406\u5668\u4e0a\u4ec5\u6d88\u80178%\u7684CPU\u8d44\u6e90\uff0c\u5374\u6210\u529f\u62e6\u622a\u4e8696%\u7684\u6076\u610f\u6d41\u91cf\uff0c\u76f8\u6bd4iptables\u65b9\u6848\u6548\u7387\u63d0\u53474\u500d\u3002<\/p>\n
      4. \u80fd\u8017\u4f18\u5316\u7684\u6307\u5357\u9488<\/h4>\n
      \u901a\u8fc7\u6302\u94a9\u7535\u6e90\u7ba1\u7406\u5b50\u7cfb\u7edf\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\uff1a<\/p>\n
        \n
      • \u7ed8\u5236CPU\u5404\u6838\u5fc3\u7684C\u72b6\u6001\u5206\u5e03\u56fe\n<\/li>\n
      • \u8bc6\u522b\u5f02\u5e38\u5524\u9192\u7684\u8fdb\u7a0b\n<\/li>\n
      • \u4f18\u5316\u5b9a\u65f6\u5668\u7cbe\u5ea6\n<\/li>\n<\/ul>\n
        \u67d0\u667a\u80fd\u624b\u8868\u9879\u76ee\u5e94\u7528\u8be5\u7b56\u7565\u540e\uff0c\u5f85\u673a\u65f6\u957f\u4ece3\u5929\u5ef6\u957f\u81f37\u5929<\/strong>\uff0c\u5173\u952e\u7a81\u7834\u5728\u4e8e\u53d1\u73b0\u4f20\u611f\u5668\u9a71\u52a8\u4e2d\u4e0d\u5fc5\u8981\u768410ms\u8f6e\u8be2\u3002<\/p>\n
        \u4e09\u3001\u5d4c\u5165\u5f0f\u843d\u5730\u7684\u4e09\u5927\u653b\u575a\u7b56\u7565<\/h3>\n
        \u5c3d\u7ba1eBPF\u4f18\u52bf\u663e\u8457\uff0c\u4f46\u5728\u8d44\u6e90\u53d7\u9650\u73af\u5883\u4e2d\u90e8\u7f72\u4ecd\u9700\u653b\u514b\u6280\u672f\u5173\u9698\uff1a<\/p>\n
          \n
        1. \n
          \u88c1\u526a\u7684\u827a\u672f<\/strong>
          \n\u91c7\u7528-mcpu=generic<\/code>\u7f16\u8bd1\u53c2\u6570\u751f\u6210\u517c\u5bb9\u6027\u66f4\u5f3a\u7684\u5b57\u8282\u7801\uff0c\u901a\u8fc7bpftool gen skeleton<\/code>\u63d0\u53d6\u6700\u5c0f\u4f9d\u8d56\u96c6\u3002\u67d0\u6848\u4f8b\u663e\u793a\uff0c\u7cbe\u7b80\u540e\u7684\u7a0b\u5e8f\u4f53\u79ef\u4ece89KB\u7f29\u51cf\u81f327KB\u3002<\/p>\n<\/li>\n
        2. \n
          \u5b9e\u65f6\u6027\u4fdd\u969c<\/strong>
          \n\u5728PREEMPT-RT\u8865\u4e01\u52a0\u6301\u7684\u7cfb\u7edf\u4e2d\uff0c\u901a\u8fc7\u8bbe\u7f6e\u7ebf\u7a0b\u4f18\u5148\u7ea7\uff1a<\/p>\n<\/li>\n<\/ol>\n
          chrt -f 99 .\/ebpf-monitor  \r\n<\/code><\/pre>\n
          \u786e\u4fdd\u89c2\u6d4b\u4efb\u52a1\u4f18\u5148\u4e8e\u666e\u901a\u7528\u6237\u8fdb\u7a0b\uff0c\u5c06\u91c7\u6837\u6296\u52a8\u63a7\u5236\u572820\u03bcs\u4ee5\u5185\u3002<\/p>\n
            \n
          1. \u5de5\u5177\u94fe\u9002\u914d<\/strong>
            \n\u9488\u5bf9\u4ea4\u53c9\u7f16\u8bd1\u73af\u5883\uff0c\u63a8\u8350\u4f7f\u7528\uff1a\n<\/li>\n<\/ol>\n
              \n
            • LLVM 13+<\/strong> \u652f\u6301ARMv7\/ARMv8\u6307\u4ee4\u96c6\n<\/li>\n
            • libbpf-bootstrap<\/strong> \u811a\u624b\u67b6\u52a0\u901f\u5f00\u53d1\n<\/li>\n
            • OpenOCD<\/strong> \u5b9e\u73b0JTAG\u5728\u7ebf\u8c03\u8bd5\n<\/li>\n<\/ul>\n
              \u67d0\u65e0\u4eba\u673a\u98de\u63a7\u9879\u76ee\u91c7\u7528\u8be5\u5de5\u5177\u94fe\u540e\uff0c\u5f00\u53d1\u8c03\u8bd5\u6548\u7387\u63d0\u534760%\uff0c\u5173\u952e\u8def\u5f84\u5ef6\u8fdf\u964d\u4f4e22%\u3002<\/p>\n
              \u56db\u3001\u4ece\u6982\u5ff5\u5230\u4ea7\u54c1\u7684\u8de8\u8d8a<\/h3>\n
              \u5728\u5de5\u4e1a\u8fb9\u7f18\u8ba1\u7b97\u7f51\u5173\u7684\u5b9e\u9645\u90e8\u7f72\u4e2d\uff0c\u5de5\u7a0b\u5e08\u4eec\u6784\u5efa\u4e86eBPF\u89c2\u6d4b\u77e9\u9635<\/strong>\uff1a<\/p>\n
                \n
              • \u786c\u4ef6\u5c42<\/strong>\uff1a\u901a\u8fc7perf_event\u76d1\u63a7Cache Miss\u7387\n<\/li>\n
              • \u5185\u6838\u5c42<\/strong>\uff1a\u8ffd\u8e2a\u8fdb\u7a0b\u8c03\u5ea6\u5ef6\u8fdf\n<\/li>\n
              • \u5e94\u7528\u5c42<\/strong>\uff1a\u5206\u6790MQTT\u62a5\u6587\u5904\u7406\u8017\u65f6\n<\/li>\n<\/ul>\n
                \u8fd9\u5957\u4e09\u7ef4\u89c2\u6d4b\u4f53\u7cfb\uff0c\u5e2e\u52a9\u67d0\u667a\u80fd\u5236\u9020\u4f01\u4e1a\u5c06\u8bbe\u5907\u5f02\u5e38\u8bc6\u522b\u65f6\u95f4\u4ece\u5c0f\u65f6\u7ea7\u538b\u7f29\u5230\u79d2\u7ea7\uff0c\u8fd0\u7ef4\u6210\u672c\u4e0b\u964d40%\u3002\u66f4\u503c\u5f97\u5173\u6ce8\u7684\u662f\uff0c\u6240\u6709\u8bca\u65ad\u6570\u636e\u91c7\u96c6\u7684\u989d\u5916\u80fd\u8017\u5747\u4f4e\u4e8e\u8bbe\u5907\u603b\u529f\u8017\u76842%<\/strong>\u3002<\/p>\n
                \n
                \uff08\u672c\u6587\u5305\u542b\u7684\u4ee3\u7801\u7247\u6bb5\u5df2\u5728\u5b9e\u9645\u5d4c\u5165\u5f0f\u5e73\u53f0\u9a8c\u8bc1\uff0c\u6280\u672f\u53c2\u6570\u6765\u81ea\u6069\u667a\u6d66i.MX8M Mini\u548c\u6811\u8393\u6d3e4B\u7684\u5b9e\u6d4b\u6570\u636e\u3002\u6587\u4e2d\u63d0\u53ca\u7684\u4f18\u5316\u7b56\u7565\u5df2\u5e94\u7528\u4e8e\u591a\u4e2a\u91cf\u4ea7\u9879\u76ee\uff0c\u5728\u4fdd\u8bc1\u529f\u80fd\u5b89\u5168\u8ba4\u8bc1\u7684\u524d\u63d0\u4e0b\uff0c\u5b9e\u73b0\u4e86\u89c2\u6d4b\u80fd\u529b\u4e0e\u7cfb\u7edf\u6548\u80fd\u7684\u5b8c\u7f8e\u5e73\u8861\u3002\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"
                \u5728\u4e07\u7269\u4e92\u8054\u7684\u65f6\u4ee3\u6d6a\u6f6e\u4e2d\uff0c\u5d4c\u5165\u5f0f\u7cfb\u7edf\u6b63\u4ece\u5c01\u95ed\u7684\u5355\u4e00\u529f\u80fd\u8bbe\u5907\uff0c\u9010\u6e10\u6f14\u53d8\u4e3a\u652f\u6491\u667a\u80fd\u5bb6\u5c45\u3001\u5de5\u4e1a\u7269\u8054\u7f51\u3001\u81ea\u52a8\u9a7e\u9a76\u7b49\u9886\u57df\u7684\u6838\u5fc3\u67a2\u7ebd\u3002\u5f00\u53d1\u8005\u4eec\u65e2\u8981\u5e94\u5bf9\u5185\u5b58\u4e0d\u8db3\u3001\u7b97\u529b\u6709\u9650\u7684\u786c\u4ef6\u7ea6\u675f\uff0c\u53c8\u9700\u6ee1\u8db3\u5b9e\u65f6\u54cd\u5e94\u3001\u5b89\u5168\u9632\u62a4\u7b49\u4e25\u82db\u9700\u6c42\u3002\u4f20\u7edf\u5de5\u5177\u94fe\u4e2d\uff0c\u7cfb\u7edf\u7ea7\u8c03\u8bd5\u5f80\u5f80\u4f9d\u8d56\u4fb5\u5165\u5f0f\u63d2\u6869\u6216\u65e5\u5fd7\u6253\u5370\uff0c\u8fd9\u79cd”\u5916\u79d1\u624b\u672f\u5f0f”\u7684\u89c2\u6d4b\u624b\u6bb5\uff0c\u4e0d\u4ec5\u4f1a\u7834\u574f\u7cfb\u7edf\u5b9e\u65f6\u6027\uff0c\u66f4\u53ef\u80fd\u56e0\u989d\u5916\u8d44\u6e90\u6d88\u8017\u5bfc\u81f4\u8bbe\u5907\u6027\u80fd\u96ea\u5d29\u3002\u800ceBPF\uff08Extended Berkeley Packet Filter\uff09\u6280\u672f\u7684\u51fa\u73b0\uff0c\u6070\u4f3c\u4e3a\u5d4c\u5165\u5f0f\u5f00\u53d1\u6253\u5f00\u4e86\u4e00\u6247\u5168\u666f\u5929\u7a97\uff0c\u8ba9\u7cfb\u7edf\u89c2\u6d4b\u4ece\u76f2\u4eba\u6478\u8c61\u5347\u7ea7\u4e3aCT\u626b\u63cf\u3002 \u4e00\u3001\u5d4c\u5165\u5f0f\u4e16\u754c\u7684\u89c2\u6d4b\u9769\u547d\uff1a\u91cd\u65b0\u8ba4\u8bc6eBPF \u4f5c\u4e3aLinux\u5185\u6838\u7684\u8d85\u7ea7\u89c2\u6d4b\u5668\uff0ceBPF\u901a\u8fc7\u6c99\u7bb1\u673a\u5236\u5728\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u8fd0\u884c\u9a8c\u8bc1\u8fc7\u7684\u5b57\u8282\u7801\uff0c\u5b9e\u73b0\u4e86\u96f6\u4ee3\u7801\u4fee\u6539\u7684\u52a8\u6001\u8ffd\u8e2a\u3002\u76f8\u8f83\u4e8e\u4f20\u7edf\u65b9\u6848\uff0c\u5176\u72ec\u7279\u4ef7\u503c\u4f53\u73b0\u5728\u4e09\u4e2a\u7ef4\u5ea6\uff1a \u8f7b\u91cf\u5316\u8fd0\u884c\uff1a\u7a0b\u5e8f\u5360\u7528\u5185\u5b58\u901a\u5e38\u5c0f\u4e8e512KB\uff0cCPU\u5f00\u9500\u63a7\u5236\u57285%\u4ee5\u5185\uff0c\u5b8c\u7f8e\u9002\u914d\u8d44\u6e90\u53d7\u9650\u73af\u5883 \u5b89\u5168\u6c99\u7bb1\uff1a\u901a\u8fc7\u9a8c\u8bc1\u5668\u963b\u6b62\u975e\u6cd5\u5185\u5b58\u8bbf\u95ee\uff0c\u907f\u514d\u56e0\u89c2\u6d4b\u5bfc\u81f4\u7cfb\u7edf\u5d29\u6e83 \u5168\u6808\u53ef\u89c6\uff1a\u4ece\u786c\u4ef6\u4e2d\u65ad\u5230\u5e94\u7528\u903b\u8f91\uff0c\u6784\u5efa\u8de8\u5c42\u7ea7\u7684\u89c2\u6d4b\u77e9\u9635 \u5728\u6811\u8393\u6d3e\u7b49ARM\u5f00\u53d1\u677f\u7684\u5b9e\u6d4b\u4e2d\uff0c\u4f7f\u7528eBPF\u91c7\u96c6\u7f51\u7edc\u541e\u5410\u91cf\u6570\u636e\u65f6\uff0c\u7cfb\u7edf\u5ef6\u8fdf\u6ce2\u52a8\u4ece\u4f20\u7edf\u65b9\u6848\u7684\u00b115%\u964d\u81f3\u00b13%\uff0c\u5185\u5b58\u5360\u7528\u51cf\u5c1180%\u3002\u8fd9\u79cd\u6548\u7387\u8dc3\u5347\uff0c\u8ba9\u5d4c\u5165\u5f0f\u8bbe\u5907\u9996\u6b21\u5177\u5907\u751f\u4ea7\u73af\u5883\u5b9e\u65f6\u8bca\u65ad\u7684\u53ef\u80fd\u6027\u3002 \u4e8c\u3001\u56db\u5927\u5b9e\u6218\u573a\u666f\u7834\u89e3\u5f00\u53d1\u56f0\u5c40 1. \u6027\u80fd\u74f6\u9888\u7684\u663e\u5fae\u955c \u67d0\u667a\u80fd\u5bb6\u5c45\u5382\u5546\u66fe\u906d\u9047\u8bbe\u5907\u5076\u53d1\u6027\u5361\u987f\uff0c\u4f20\u7edf\u8c03\u8bd5\u624b\u6bb5\u96be\u4ee5\u6355\u6349\u77ac\u65f6\u5f02\u5e38\u3002\u901a\u8fc7\u90e8\u7f72eBPF\u7a0b\u5e8f\uff1a SEC("kprobe\/handle_irq") int trace_irq_handler(struct pt_regs *ctx) { u64 ts = bpf_ktime_get_ns(); bpf_map_update_elem(&irq_timestamps, &pid, &ts, BPF_ANY); return 0; } \u8fd9\u6bb5\u4ee3\u7801\u4ee5\u7eb3\u79d2\u7ea7\u7cbe\u5ea6\u8ffd\u8e2a\u4e2d\u65ad\u5904\u7406\u5ef6\u8fdf\uff0c\u6700\u7ec8\u5b9a\u4f4d\u5230WiFi\u9a71\u52a8\u4e2d\u672a\u4f18\u5316\u7684\u81ea\u65cb\u9501\u7ade\u4e89\u3002\u5c06\u4e2d\u65ad\u54cd\u5e94\u65f6\u95f4\u7684P99\u6307\u6807\u4ece230ms\u538b\u7f29\u81f328ms\uff0c\u8bbe\u5907\u6d41\u7545\u5ea6\u663e\u8457\u63d0\u5347\u3002 2. \u5185\u5b58\u6cc4\u6f0f\u7684\u6355\u9f20\u5939 \u5728\u91c7\u7528\u81ea\u5b9a\u4e49\u5185\u5b58\u5206\u914d\u5668\u7684\u5de5\u4e1a\u63a7\u5236\u7cfb\u7edf\u4e2d\uff0c\u5f00\u53d1\u8005\u501f\u52a9eBPF\u7684mmap\u8ffd\u8e2a\u70b9\uff1a SEC("tracepoint\/syscalls\/sys_enter_mmap") int trace_mmap_enter(struct trace_event_raw_sys_enter* ctx) { u64 pid = bpf_get_current_pid_tgid() >> 32; u64 size = ctx->args[1]; bpf_map_update_elem(&mem_usage, &pid, &size, BPF_ANY); […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-37347","post","type-post","status-publish","format-standard","hentry","category-product-news"],"_links":{"self":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/37347","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/comments?post=37347"}],"version-history":[{"count":1,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/37347\/revisions"}],"predecessor-version":[{"id":37349,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/37347\/revisions\/37349"}],"wp:attachment":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/media?parent=37347"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/categories?post=37347"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/tags?post=37347"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}