{"id":33629,"date":"2025-03-07T10:52:48","date_gmt":"2025-03-07T02:52:48","guid":{"rendered":"https:\/\/www.yunshan.net\/blog\/?p=33629"},"modified":"2025-03-07T10:52:48","modified_gmt":"2025-03-07T02:52:48","slug":"ebpf%e5%a6%82%e4%bd%95%e5%b8%ae%e5%8a%a9%e9%99%8d%e4%bd%8e%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e7%9a%84%e5%bc%80%e9%94%80%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.yunshan.net\/blog\/archives\/33629.html","title":{"rendered":"eBPF\u5982\u4f55\u5e2e\u52a9\u964d\u4f4e\u7cfb\u7edf\u8c03\u7528\u7684\u5f00\u9500\uff1f"},"content":{"rendered":"<p style=\"text-align: center;\">\n<p><img decoding=\"async\" src=\"https:\/\/www.yunshan.net\/blog\/wp-content\/uploads\/2025\/03\/qZaumH.jpg\" alt=\"eBPF\u5982\u4f55\u5e2e\u52a9\u964d\u4f4e\u7cfb\u7edf\u8c03\u7528\u7684\u5f00\u9500\uff1f\" ><\/p>\n<\/p>\n<p>\u5728\u4e91\u8ba1\u7b97\u4e0e\u5fae\u670d\u52a1\u67b6\u6784\u4e3b\u5bfc\u6280\u672f\u6f6e\u6d41\u7684\u4eca\u5929\uff0c\u7cfb\u7edf\u6027\u80fd\u4f18\u5316\u5df2\u6210\u4e3a\u5f00\u53d1\u8005\u4e0d\u53ef\u56de\u907f\u7684\u6311\u6218\u3002\u5f53\u6211\u4eec\u7528\u4f20\u7edf\u5de5\u5177\u76d1\u63a7\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0c\u5f80\u5f80\u4f1a\u9677\u5165\u4e24\u96be\u5883\u5730\uff1a<strong>strace<\/strong>\u7b49\u5de5\u5177\u867d\u80fd\u5b8c\u6574\u6355\u83b7\u7cfb\u7edf\u8c03\u7528\uff0c\u5374\u5bfc\u81f4\u88ab\u89c2\u6d4b\u7a0b\u5e8f\u6027\u80fd\u4e0b\u964d300%\u4ee5\u4e0a\uff1b\u800c\u91c7\u6837\u5f0f\u68c0\u6d4b\u867d\u964d\u4f4e\u4e86\u5f00\u9500\uff0c\u5374\u53ef\u80fd\u4e22\u5931\u5173\u952e\u4e8b\u4ef6\u7ebf\u7d22\u3002\u8fd9\u79cd\u56f0\u5883\u6b63\u88ab\u4e00\u9879\u9769\u65b0\u6027\u6280\u672f\u6253\u7834\u2014\u2014<strong><a href=\"https:\/\/www.yunshan.net\/\"   target=\"_blank\" style=\"color:blue\">eBPF<\/a><\/strong>\u901a\u8fc7\u91cd\u65b0\u5b9a\u4e49\u5185\u6838\u89c2\u6d4b\u8303\u5f0f\uff0c\u5c06\u7cfb\u7edf\u8c03\u7528\u7684\u76d1\u63a7\u5f00\u9500\u4ece&rdquo;\u4e0d\u53ef\u627f\u53d7\u4e4b\u91cd&rdquo;\u8f6c\u53d8\u4e3a&rdquo;\u8f7b\u91cf\u7ea7\u64cd\u4f5c&rdquo;\uff0c\u751a\u81f3\u5728\u67d0\u4e9b\u573a\u666f\u5b9e\u73b0<strong>\u96f6\u5f00\u9500\u89c2\u6d4b<\/strong>\u3002<\/p>\n<h3 id=\"\u4e00-\u7cfb\u7edf\u8c03\u7528\u4e3a\u4f55\u6210\u4e3a\u6027\u80fd\u74f6\u9888\">\u4e00\u3001\u7cfb\u7edf\u8c03\u7528\u4e3a\u4f55\u6210\u4e3a\u6027\u80fd\u74f6\u9888<\/h3>\n<p>\u7cfb\u7edf\u8c03\u7528\u4f5c\u4e3a\u7528\u6237\u6001\u4e0e\u5185\u6838\u6001\u7684\u5206\u754c\u7ebf\uff0c\u5176\u6267\u884c\u8fc7\u7a0b\u4f34\u968f\u7740<strong>\u4e0a\u4e0b\u6587\u5207\u6362<\/strong>\u3001<strong>CPU\u6a21\u5f0f\u8f6c\u6362<\/strong>\u548c<strong>\u7279\u6743\u7ea7\u9a8c\u8bc1<\/strong>\u4e09\u91cd\u5f00\u9500\u3002\u5f53\u8fdb\u7a0b\u6267\u884copen()\u6216write()\u7b49\u64cd\u4f5c\u65f6\uff0cCPU\u9700\u8981\u5b8c\u6210\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n<ol>\n<li>\u4fdd\u5b58\u7528\u6237\u6001\u5bc4\u5b58\u5668\u72b6\u6001\n<\/li>\n<li>\u5207\u6362\u81f3\u5185\u6838\u5730\u5740\u7a7a\u95f4\n<\/li>\n<li>\u6267\u884c\u6743\u9650\u68c0\u67e5\n<\/li>\n<li>\u8c03\u7528\u5bf9\u5e94\u5904\u7406\u51fd\u6570\n<\/li>\n<li>\u6062\u590d\u7528\u6237\u6001\u4e0a\u4e0b\u6587\n<\/li>\n<\/ol>\n<p>\u4f20\u7edf\u76d1\u63a7\u5de5\u5177\u5982strace\u91c7\u7528ptrace\u673a\u5236\uff0c\u5728\u6bcf\u6b21\u7cfb\u7edf\u8c03\u7528\u65f6\u4e2d\u65ad\u76ee\u6807\u8fdb\u7a0b\uff0c\u8fd9\u79cd<strong>\u540c\u6b65\u62e6\u622a<\/strong>\u65b9\u5f0f\u5bfc\u81f4\uff1a<\/p>\n<ul>\n<li>\u6bcf\u6b21syscall\u589e\u52a0\u7ea610\u03bcs\u5ef6\u8fdf\n<\/li>\n<li>\u9891\u7e41\u7684\u8fdb\u7a0b\u4e0a\u4e0b\u6587\u5207\u6362\n<\/li>\n<li>\u989d\u5916\u7684\u5185\u5b58\u62f7\u8d1d\u64cd\u4f5c\n<\/li>\n<li>\u53ef\u80fd\u89e6\u53d1CPU\u7f13\u5b58\u5931\u6548\n<\/li>\n<\/ul>\n<p>\u8fd9\u79cd\u8bbe\u8ba1\u5728\u6bcf\u79d2\u5904\u7406\u767e\u4e07\u8bf7\u6c42\u7684\u9ad8\u5e76\u53d1\u573a\u666f\u4e2d\uff0c\u6027\u80fd\u635f\u8017\u4f1a\u88ab\u6307\u6570\u7ea7\u653e\u5927\u3002\u800c<a href=\"https:\/\/www.yunshan.net\/\"   target=\"_blank\" style=\"color:blue\">eBPF<\/a>\u7684\u7a81\u7834\u6027\u5728\u4e8e\uff0c\u5b83\u901a\u8fc7<strong>\u52a8\u6001\u6ce8\u5165\u9a8c\u8bc1\u8fc7\u7684\u5b57\u8282\u7801<\/strong>\uff0c\u5728\u5185\u6838\u4e2d\u76f4\u63a5\u5904\u7406\u89c2\u6d4b\u903b\u8f91\uff0c\u5b8c\u5168\u89c4\u907f\u4e86\u4f20\u7edf\u65b9\u6848\u7684\u6027\u80fd\u9677\u9631\u3002<\/p>\n<h3 id=\"\u4e8c-ebpf\u98a0\u8986\u6027\u80fd\u635f\u8017\u7684\u56db\u5927\u673a\u5236\">\u4e8c\u3001eBPF\u98a0\u8986\u6027\u80fd\u635f\u8017\u7684\u56db\u5927\u673a\u5236<\/h3>\n<h4 id=\"1-\u96f6\u4e0a\u4e0b\u6587\u5207\u6362\u7684\u89c2\u6d4b\u8def\u5f84\">1. <strong>\u96f6\u4e0a\u4e0b\u6587\u5207\u6362\u7684\u89c2\u6d4b\u8def\u5f84<\/strong><\/h4>\n<p>eBPF\u7a0b\u5e8f\u901a\u8fc7<code>tracepoint<\/code>\u6216<code>kprobe<\/code>\u6302\u8f7d\u5230sys_enter\/sys_exit\u7b49\u5185\u6838\u8ddf\u8e2a\u70b9\uff0c\u5728\u5185\u6838\u5730\u5740\u7a7a\u95f4\u76f4\u63a5\u6267\u884c\u8fc7\u6ee4\u3001\u7edf\u8ba1\u7b49\u64cd\u4f5c\u3002\u76f8\u6bd4\u9700\u8981\u53cd\u590d\u5207\u6362\u7528\u6237\/\u5185\u6838\u6001\u7684ptrace\u65b9\u6848\uff0c\u8fd9\u79cd<strong>\u539f\u5730\u5904\u7406(in-situ processing)<\/strong>\u6a21\u5f0f\u6d88\u9664\u4e86\uff1a<\/p>\n<ul>\n<li>\u8fdb\u7a0b\u8c03\u5ea6\u5ef6\u8fdf\n<\/li>\n<li>\u5185\u5b58\u9875\u8868\u5207\u6362\u5f00\u9500\n<\/li>\n<li>TLB\u7f13\u5b58\u5237\u65b0\u4ee3\u4ef7\n<\/li>\n<\/ul>\n<p>\u5b9e\u6d4b\u6570\u636e\u663e\u793a\uff0c\u5728\u89c2\u6d4bwrite()\u7cfb\u7edf\u8c03\u7528\u65f6\uff0ceBPF\u65b9\u6848\u5c06\u5355\u6b21\u76d1\u63a7\u5f00\u9500\u4ece3.2\u03bcs\u964d\u4f4e\u81f30.07\u03bcs\uff0c\u964d\u5e45\u8fbe\u5230\u60ca\u4eba\u768498%\u3002<\/p>\n<h4 id=\"2-\u96f6\u62f7\u8d1d\u6570\u636e\u7ba1\u9053\">2. <strong>\u96f6\u62f7\u8d1d\u6570\u636e\u7ba1\u9053<\/strong><\/h4>\n<p>\u4f20\u7edf\u65b9\u6848\u9700\u8981\u5c06\u7cfb\u7edf\u8c03\u7528\u53c2\u6570\u4ece\u5185\u6838\u7a7a\u95f4\u62f7\u8d1d\u5230\u7528\u6237\u7a7a\u95f4\u8fdb\u884c\u5206\u6790\uff0c\u800ceBPF\u901a\u8fc7<code>perf_event<\/code>\u73af\u5f62\u7f13\u51b2\u533a\u4e0e<code>BPF maps<\/code>\u5b9e\u73b0\uff1a<\/p>\n<ul>\n<li>\u5728\u5185\u6838\u4e2d\u9884\u5904\u7406\u5173\u952e\u6570\u636e\n<\/li>\n<li>\u4ec5\u4f20\u8f93\u5fc5\u8981\u5143\u4fe1\u606f\n<\/li>\n<li>\u7528\u6237\u6001\u7a0b\u5e8f\u5f02\u6b65\u6d88\u8d39\u6570\u636e\n<\/li>\n<\/ul>\n<p>\u8fd9\u79cd\u8bbe\u8ba1\u5c06\u5178\u578b\u573a\u666f\u4e0b\u7684\u5185\u5b58\u62f7\u8d1d\u91cf\u51cf\u5c1190%\u4ee5\u4e0a\u3002\u4f8b\u5982\u76d1\u63a7connect()\u8c03\u7528\u65f6\uff0ceBPF\u53ef\u76f4\u63a5\u63d0\u53d6\u76ee\u6807IP\u548c\u7aef\u53e3\uff0c\u65e0\u9700\u590d\u5236\u6574\u4e2asockaddr\u7ed3\u6784\u4f53\u3002<\/p>\n<h4 id=\"3-jit\u7f16\u8bd1\u52a0\u901f\u6267\u884c\">3. <strong>JIT\u7f16\u8bd1\u52a0\u901f\u6267\u884c<\/strong><\/h4>\n<p>eBPF\u865a\u62df\u673a\u5305\u542bLLVM\u652f\u6301\u7684\u5373\u65f6\u7f16\u8bd1\u5668\uff0c\u5c06\u5b57\u8282\u7801\u8f6c\u6362\u4e3a\u672c\u5730\u673a\u5668\u6307\u4ee4\u3002\u7ecfJIT\u4f18\u5316\u540e\u7684eBPF\u7a0b\u5e8f\uff1a<\/p>\n<ul>\n<li>\u6267\u884c\u6548\u7387\u63a5\u8fd1\u539f\u751fC\u4ee3\u7801\n<\/li>\n<li>\u907f\u514d\u4e86\u89e3\u91ca\u578b\u865a\u62df\u673a\u7684\u5206\u652f\u9884\u6d4b\u60e9\u7f5a\n<\/li>\n<li>\u6307\u4ee4\u7f13\u5b58\u547d\u4e2d\u7387\u63d0\u534740%\n<\/li>\n<\/ul>\n<p>\u5728Linux 5.16\u5185\u6838\u4e2d\uff0cJIT\u7f16\u8bd1\u4f7feBPF\u7a0b\u5e8f\u7684\u5e73\u5747\u6267\u884c\u65f6\u95f4\u7f29\u77ed\u81f363\u7eb3\u79d2\uff0c\u6bd4\u89e3\u91ca\u6267\u884c\u5feb17\u500d\u3002<\/p>\n<h4 id=\"4-\u7cbe\u51c6\u4e8b\u4ef6\u8fc7\u6ee4\">4. <strong>\u7cbe\u51c6\u4e8b\u4ef6\u8fc7\u6ee4<\/strong><\/h4>\n<p>\u901a\u8fc7\u9884\u7f6e\u8fc7\u6ee4\u6761\u4ef6\uff0ceBPF\u53ef\u5728\u5185\u6838\u4e2d\u4e22\u5f03\u65e0\u5173\u4e8b\u4ef6\uff1a<\/p>\n<pre><code class=\"language-c\">\/\/ \u4ec5\u76d1\u63a7UID=1000\u7684write\u8c03\u7528  \r\nif (uid != 1000 || id != __NR_write)  \r\nreturn 0;  \r\n<\/code><\/pre>\n<p>\u8fd9\u79cd<strong>\u5185\u6838\u7ea7\u8fc7\u6ee4<\/strong>\u907f\u514d\u4e86\u65e0\u6548\u6570\u636e\u5411\u7528\u6237\u6001\u7684\u4f20\u9012\u3002\u6d4b\u8bd5\u8868\u660e\uff0c\u5f53\u76ee\u6807\u4e8b\u4ef6\u5360\u6bd4\u4f4e\u4e8e5%\u65f6\uff0c\u8fc7\u6ee4\u673a\u5236\u53ef\u51cf\u5c1192%\u7684CPU\u5360\u7528\u3002<\/p>\n<h3 id=\"\u4e09-\u5b9e\u6218\u573a\u666f\u4e2d\u7684\u6027\u80fd\u63d0\u5347\">\u4e09\u3001\u5b9e\u6218\u573a\u666f\u4e2d\u7684\u6027\u80fd\u63d0\u5347<\/h3>\n<h4 id=\"\u6848\u4f8b1-\u7f51\u7edc\u8fde\u63a5\u8ffd\u8e2a\u4f18\u5316\">\u6848\u4f8b1\uff1a\u7f51\u7edc\u8fde\u63a5\u8ffd\u8e2a\u4f18\u5316<\/h4>\n<p>\u67d0CDN\u670d\u52a1\u5546\u4f7f\u7528eBPF\u91cd\u6784\u5176\u8fde\u63a5\u76d1\u63a7\u7cfb\u7edf\uff1a<\/p>\n<ul>\n<li>\u5c06accept()\u8c03\u7528\u7684\u5904\u7406\u5ef6\u8fdf\u4ece1200ns\u964d\u81f380ns\n<\/li>\n<li>\u6bcf\u79d2\u53ef\u5904\u7406\u7684HTTP\u8bf7\u6c42\u6570\u63d0\u534723\u500d\n<\/li>\n<li>\u8282\u70b9CPU\u4f7f\u7528\u7387\u4e0b\u964d62%\n<\/li>\n<\/ul>\n<p>\u5176\u6838\u5fc3\u4f18\u5316\u5728\u4e8e\u7528<code>BPF_PROG_TYPE_SOCK_OPS<\/code>\u7a0b\u5e8f\u5728TCP\u5efa\u7acb\u9636\u6bb5\u76f4\u63a5\u6ce8\u5165\u5904\u7406\u903b\u8f91\uff0c\u907f\u514d\u901a\u8fc7\u591a\u6b21\u7cfb\u7edf\u8c03\u7528\u83b7\u53d6\u8fde\u63a5\u4fe1\u606f\u3002<\/p>\n<h4 id=\"\u6848\u4f8b2-\u5b89\u5168\u7b56\u7565\u6267\u884c\u52a0\u901f\">\u6848\u4f8b2\uff1a\u5b89\u5168\u7b56\u7565\u6267\u884c\u52a0\u901f<\/h4>\n<p>\u4e91\u5b89\u5168\u5382\u5546\u901a\u8fc7eBPF\u5b9e\u73b0\u5b9e\u65f6\u5165\u4fb5\u68c0\u6d4b\uff1a<\/p>\n<ul>\n<li>\u6587\u4ef6\u6253\u5f00\u68c0\u6d4b\u4ece\u03bcs\u7ea7\u5ef6\u8fdf\u964d\u81f3ns\u7ea7\n<\/li>\n<li>\u7b56\u7565\u5339\u914d\u5728\u5185\u6838\u4e2d\u5b8c\u6210\n<\/li>\n<li>\u7ed5\u8fc7\u4f20\u7edf\u65b9\u6848\u4e2d\u7684\u7cfb\u7edf\u8c03\u7528\u5ba1\u8ba1\u5f00\u9500\n<\/li>\n<\/ul>\n<p>\u91c7\u7528<code>BPF_LSM<\/code>\u6302\u8f7d\u70b9\u540e\uff0copenat()\u7cfb\u7edf\u8c03\u7528\u7684\u5b89\u5168\u68c0\u67e5\u8017\u65f6\u4ece1.4\u03bcs\u51cf\u5c11\u52300.3\u03bcs\uff0c\u540c\u65f6\u963b\u6b62\u4e8697%\u7684\u6076\u610f\u6587\u4ef6\u8bbf\u95ee\u5c1d\u8bd5\u3002<\/p>\n<h3 id=\"\u56db-\u6700\u4f73\u5b9e\u8df5\u4e0e\u6ce8\u610f\u4e8b\u9879\">\u56db\u3001\u6700\u4f73\u5b9e\u8df5\u4e0e\u6ce8\u610f\u4e8b\u9879<\/h3>\n<p>\u5c3d\u7ba1eBPF\u663e\u8457\u964d\u4f4e\u4e86\u7cfb\u7edf\u8c03\u7528\u5f00\u9500\uff0c\u4f46\u8981\u5b9e\u73b0\u6700\u4f73\u6548\u679c\u4ecd\u9700\u6ce8\u610f\uff1a<\/p>\n<ol>\n<li><strong>\u907f\u514d\u8fc7\u5ea6\u805a\u5408<\/strong>\uff1a\u5728\u5185\u6838\u4e2d\u5b8c\u6210\u7edf\u8ba1\u6458\u8981\uff0c\u800c\u975e\u4f20\u8f93\u539f\u59cb\u4e8b\u4ef6\n<\/li>\n<li><strong>\u63a7\u5236\u63a2\u6d4b\u5bc6\u5ea6<\/strong>\uff1a\u5355\u4e2a\u8ddf\u8e2a\u70b9\u6302\u8f7d\u591a\u4e2aBPF\u7a0b\u5e8f\u4f1a\u5f15\u5165\u7d2f\u52a0\u5ef6\u8fdf\n<\/li>\n<li><strong>\u5185\u5b58\u8bbf\u95ee\u5b89\u5168<\/strong>\uff1a\u5fc5\u987b\u4f7f\u7528<code>bpf_probe_read<\/code>\u8fdb\u884c\u8fb9\u754c\u68c0\u67e5\n<\/li>\n<li><strong>\u7248\u672c\u517c\u5bb9\u7b56\u7565<\/strong>\uff1a\u4e0d\u540c\u5185\u6838\u7248\u672c\u5bf9syscall\u8ddf\u8e2a\u70b9\u7684\u652f\u6301\u5b58\u5728\u5dee\u5f02\n<\/li>\n<\/ol>\n<p>\u5f00\u53d1\u65f6\u53ef\u501f\u52a9BCC\u5de5\u5177\u96c6\u7684<code>syscount-bpfcc<\/code>\u7b49\u5de5\u5177\u8fdb\u884c\u57fa\u7ebf\u6d4b\u8bd5\uff0c\u5bf9\u6bd4\u4f18\u5316\u524d\u540e\u7684perf\u7edf\u8ba1\u6570\u636e\uff1a<\/p>\n<pre><code class=\"language-bash\">$ \/usr\/share\/bcc\/tools\/syscount -T -P  \r\nTracing syscalls, printing top 10... Ctrl+C to quit.  \r\n<\/code><\/pre>\n<p>\u503c\u5f97\u5173\u6ce8\u7684\u662f\uff0cLinux 6.0\u5f15\u5165\u7684<strong>BPF trampoline<\/strong>\u6280\u672f\u8fdb\u4e00\u6b65\u4f18\u5316\u4e86\u8c03\u7528\u8df3\u8f6c\u6d41\u7a0b\uff0c\u4f7feBPF\u7a0b\u5e8f\u6267\u884c\u6548\u7387\u63d0\u534730%\u3002\u8fd9\u9884\u793a\u7740\u5728\u672a\u6765\uff0c\u7cfb\u7edf\u8c03\u7528\u5c42\u9762\u7684\u6027\u80fd\u4f18\u5316\u5c06\u66f4\u52a0\u4f9d\u8d56eBPF\u7b49\u5e95\u5c42\u521b\u65b0\u6280\u672f\u3002<\/p>\n<p>\u4ece\u6280\u672f\u8fdb\u5316\u7684\u89c6\u89d2\u770b\uff0ceBPF\u6b63\u5728\u91cd\u5851\u7cfb\u7edf\u89c2\u6d4b\u7684\u8303\u5f0f\u2014\u2014\u5b83\u4e0d\u518d\u662f\u88ab\u52a8\u63a5\u53d7\u6027\u80fd\u635f\u8017\u7684&rdquo;\u5fc5\u8981\u4ee3\u4ef7&rdquo;\uff0c\u800c\u662f\u8f6c\u53d8\u4e3a\u4e3b\u52a8\u4f18\u5316\u7cfb\u7edf\u884c\u4e3a\u7684&rdquo;\u6027\u80fd\u52a0\u901f\u5668&rdquo;\u3002\u8fd9\u79cd\u8f6c\u53d8\u4f7f\u5f97\u5f00\u53d1\u8005\u80fd\u591f\u4ee5\u8fd1\u4e4e\u96f6\u6210\u672c\u7684\u4ee3\u4ef7\uff0c\u83b7\u53d6\u8fc7\u53bb\u9700\u8981\u4ed8\u51fa\u5de8\u5927\u6027\u80fd\u727a\u7272\u624d\u80fd\u5f97\u5230\u7684\u6df1\u5ea6\u7cfb\u7edf\u6d1e\u5bdf\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u4e91\u8ba1\u7b97\u4e0e\u5fae\u670d\u52a1\u67b6\u6784\u4e3b\u5bfc\u6280\u672f\u6f6e\u6d41\u7684\u4eca\u5929\uff0c\u7cfb\u7edf\u6027\u80fd\u4f18\u5316\u5df2\u6210\u4e3a\u5f00\u53d1\u8005\u4e0d\u53ef\u56de\u907f\u7684\u6311\u6218\u3002\u5f53\u6211\u4eec\u7528\u4f20\u7edf\u5de5\u5177\u76d1\u63a7\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0c\u5f80\u5f80\u4f1a\u9677\u5165\u4e24\u96be\u5883\u5730\uff1astrace\u7b49\u5de5\u5177\u867d\u80fd\u5b8c\u6574\u6355\u83b7\u7cfb\u7edf\u8c03\u7528\uff0c\u5374\u5bfc\u81f4\u88ab\u89c2\u6d4b\u7a0b\u5e8f\u6027\u80fd\u4e0b\u964d300%\u4ee5\u4e0a\uff1b\u800c\u91c7\u6837\u5f0f\u68c0\u6d4b\u867d\u964d\u4f4e\u4e86\u5f00\u9500\uff0c\u5374\u53ef\u80fd\u4e22\u5931\u5173\u952e\u4e8b\u4ef6\u7ebf\u7d22\u3002\u8fd9\u79cd\u56f0\u5883\u6b63\u88ab\u4e00\u9879\u9769\u65b0\u6027\u6280\u672f\u6253\u7834\u2014\u2014eBPF\u901a\u8fc7\u91cd\u65b0\u5b9a\u4e49\u5185\u6838\u89c2\u6d4b\u8303\u5f0f\uff0c\u5c06\u7cfb\u7edf\u8c03\u7528\u7684\u76d1\u63a7\u5f00\u9500\u4ece&rdquo;\u4e0d\u53ef\u627f\u53d7\u4e4b\u91cd&rdquo;\u8f6c\u53d8\u4e3a&rdquo;\u8f7b\u91cf\u7ea7\u64cd\u4f5c&rdquo;\uff0c\u751a\u81f3\u5728\u67d0\u4e9b\u573a\u666f\u5b9e\u73b0\u96f6\u5f00\u9500\u89c2\u6d4b\u3002 \u4e00\u3001\u7cfb\u7edf\u8c03\u7528\u4e3a\u4f55\u6210\u4e3a\u6027\u80fd\u74f6\u9888 \u7cfb\u7edf\u8c03\u7528\u4f5c\u4e3a\u7528\u6237\u6001\u4e0e\u5185\u6838\u6001\u7684\u5206\u754c\u7ebf\uff0c\u5176\u6267\u884c\u8fc7\u7a0b\u4f34\u968f\u7740\u4e0a\u4e0b\u6587\u5207\u6362\u3001CPU\u6a21\u5f0f\u8f6c\u6362\u548c\u7279\u6743\u7ea7\u9a8c\u8bc1\u4e09\u91cd\u5f00\u9500\u3002\u5f53\u8fdb\u7a0b\u6267\u884copen()\u6216write()\u7b49\u64cd\u4f5c\u65f6\uff0cCPU\u9700\u8981\u5b8c\u6210\u4ee5\u4e0b\u6b65\u9aa4\uff1a \u4fdd\u5b58\u7528\u6237\u6001\u5bc4\u5b58\u5668\u72b6\u6001 \u5207\u6362\u81f3\u5185\u6838\u5730\u5740\u7a7a\u95f4 \u6267\u884c\u6743\u9650\u68c0\u67e5 \u8c03\u7528\u5bf9\u5e94\u5904\u7406\u51fd\u6570 \u6062\u590d\u7528\u6237\u6001\u4e0a\u4e0b\u6587 \u4f20\u7edf\u76d1\u63a7\u5de5\u5177\u5982strace\u91c7\u7528ptrace\u673a\u5236\uff0c\u5728\u6bcf\u6b21\u7cfb\u7edf\u8c03\u7528\u65f6\u4e2d\u65ad\u76ee\u6807\u8fdb\u7a0b\uff0c\u8fd9\u79cd\u540c\u6b65\u62e6\u622a\u65b9\u5f0f\u5bfc\u81f4\uff1a \u6bcf\u6b21syscall\u589e\u52a0\u7ea610\u03bcs\u5ef6\u8fdf \u9891\u7e41\u7684\u8fdb\u7a0b\u4e0a\u4e0b\u6587\u5207\u6362 \u989d\u5916\u7684\u5185\u5b58\u62f7\u8d1d\u64cd\u4f5c \u53ef\u80fd\u89e6\u53d1CPU\u7f13\u5b58\u5931\u6548 \u8fd9\u79cd\u8bbe\u8ba1\u5728\u6bcf\u79d2\u5904\u7406\u767e\u4e07\u8bf7\u6c42\u7684\u9ad8\u5e76\u53d1\u573a\u666f\u4e2d\uff0c\u6027\u80fd\u635f\u8017\u4f1a\u88ab\u6307\u6570\u7ea7\u653e\u5927\u3002\u800ceBPF\u7684\u7a81\u7834\u6027\u5728\u4e8e\uff0c\u5b83\u901a\u8fc7\u52a8\u6001\u6ce8\u5165\u9a8c\u8bc1\u8fc7\u7684\u5b57\u8282\u7801\uff0c\u5728\u5185\u6838\u4e2d\u76f4\u63a5\u5904\u7406\u89c2\u6d4b\u903b\u8f91\uff0c\u5b8c\u5168\u89c4\u907f\u4e86\u4f20\u7edf\u65b9\u6848\u7684\u6027\u80fd\u9677\u9631\u3002 \u4e8c\u3001eBPF\u98a0\u8986\u6027\u80fd\u635f\u8017\u7684\u56db\u5927\u673a\u5236 1. \u96f6\u4e0a\u4e0b\u6587\u5207\u6362\u7684\u89c2\u6d4b\u8def\u5f84 eBPF\u7a0b\u5e8f\u901a\u8fc7tracepoint\u6216kprobe\u6302\u8f7d\u5230sys_enter\/sys_exit\u7b49\u5185\u6838\u8ddf\u8e2a\u70b9\uff0c\u5728\u5185\u6838\u5730\u5740\u7a7a\u95f4\u76f4\u63a5\u6267\u884c\u8fc7\u6ee4\u3001\u7edf\u8ba1\u7b49\u64cd\u4f5c\u3002\u76f8\u6bd4\u9700\u8981\u53cd\u590d\u5207\u6362\u7528\u6237\/\u5185\u6838\u6001\u7684ptrace\u65b9\u6848\uff0c\u8fd9\u79cd\u539f\u5730\u5904\u7406(in-situ processing)\u6a21\u5f0f\u6d88\u9664\u4e86\uff1a \u8fdb\u7a0b\u8c03\u5ea6\u5ef6\u8fdf \u5185\u5b58\u9875\u8868\u5207\u6362\u5f00\u9500 TLB\u7f13\u5b58\u5237\u65b0\u4ee3\u4ef7 \u5b9e\u6d4b\u6570\u636e\u663e\u793a\uff0c\u5728\u89c2\u6d4bwrite()\u7cfb\u7edf\u8c03\u7528\u65f6\uff0ceBPF\u65b9\u6848\u5c06\u5355\u6b21\u76d1\u63a7\u5f00\u9500\u4ece3.2\u03bcs\u964d\u4f4e\u81f30.07\u03bcs\uff0c\u964d\u5e45\u8fbe\u5230\u60ca\u4eba\u768498%\u3002 2. \u96f6\u62f7\u8d1d\u6570\u636e\u7ba1\u9053 \u4f20\u7edf\u65b9\u6848\u9700\u8981\u5c06\u7cfb\u7edf\u8c03\u7528\u53c2\u6570\u4ece\u5185\u6838\u7a7a\u95f4\u62f7\u8d1d\u5230\u7528\u6237\u7a7a\u95f4\u8fdb\u884c\u5206\u6790\uff0c\u800ceBPF\u901a\u8fc7perf_event\u73af\u5f62\u7f13\u51b2\u533a\u4e0eBPF maps\u5b9e\u73b0\uff1a \u5728\u5185\u6838\u4e2d\u9884\u5904\u7406\u5173\u952e\u6570\u636e \u4ec5\u4f20\u8f93\u5fc5\u8981\u5143\u4fe1\u606f \u7528\u6237\u6001\u7a0b\u5e8f\u5f02\u6b65\u6d88\u8d39\u6570\u636e \u8fd9\u79cd\u8bbe\u8ba1\u5c06\u5178\u578b\u573a\u666f\u4e0b\u7684\u5185\u5b58\u62f7\u8d1d\u91cf\u51cf\u5c1190%\u4ee5\u4e0a\u3002\u4f8b\u5982\u76d1\u63a7connect()\u8c03\u7528\u65f6\uff0ceBPF\u53ef\u76f4\u63a5\u63d0\u53d6\u76ee\u6807IP\u548c\u7aef\u53e3\uff0c\u65e0\u9700\u590d\u5236\u6574\u4e2asockaddr\u7ed3\u6784\u4f53\u3002 3. JIT\u7f16\u8bd1\u52a0\u901f\u6267\u884c eBPF\u865a\u62df\u673a\u5305\u542bLLVM\u652f\u6301\u7684\u5373\u65f6\u7f16\u8bd1\u5668\uff0c\u5c06\u5b57\u8282\u7801\u8f6c\u6362\u4e3a\u672c\u5730\u673a\u5668\u6307\u4ee4\u3002\u7ecfJIT\u4f18\u5316\u540e\u7684eBPF\u7a0b\u5e8f\uff1a \u6267\u884c\u6548\u7387\u63a5\u8fd1\u539f\u751fC\u4ee3\u7801 \u907f\u514d\u4e86\u89e3\u91ca\u578b\u865a\u62df\u673a\u7684\u5206\u652f\u9884\u6d4b\u60e9\u7f5a \u6307\u4ee4\u7f13\u5b58\u547d\u4e2d\u7387\u63d0\u534740% \u5728Linux 5.16\u5185\u6838\u4e2d\uff0cJIT\u7f16\u8bd1\u4f7feBPF\u7a0b\u5e8f\u7684\u5e73\u5747\u6267\u884c\u65f6\u95f4\u7f29\u77ed\u81f363\u7eb3\u79d2\uff0c\u6bd4\u89e3\u91ca\u6267\u884c\u5feb17\u500d\u3002 4. \u7cbe\u51c6\u4e8b\u4ef6\u8fc7\u6ee4 \u901a\u8fc7\u9884\u7f6e\u8fc7\u6ee4\u6761\u4ef6\uff0ceBPF\u53ef\u5728\u5185\u6838\u4e2d\u4e22\u5f03\u65e0\u5173\u4e8b\u4ef6\uff1a \/\/ \u4ec5\u76d1\u63a7UID=1000\u7684write\u8c03\u7528 if (uid != 1000 || id != __NR_write) return 0; \u8fd9\u79cd\u5185\u6838\u7ea7\u8fc7\u6ee4\u907f\u514d\u4e86\u65e0\u6548\u6570\u636e\u5411\u7528\u6237\u6001\u7684\u4f20\u9012\u3002\u6d4b\u8bd5\u8868\u660e\uff0c\u5f53\u76ee\u6807\u4e8b\u4ef6\u5360\u6bd4\u4f4e\u4e8e5%\u65f6\uff0c\u8fc7\u6ee4\u673a\u5236\u53ef\u51cf\u5c1192%\u7684CPU\u5360\u7528\u3002 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":33630,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-33629","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-product-news"],"_links":{"self":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/33629","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=33629"}],"version-history":[{"count":1,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/33629\/revisions"}],"predecessor-version":[{"id":33631,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/33629\/revisions\/33631"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/media\/33630"}],"wp:attachment":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/media?parent=33629"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/categories?post=33629"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/tags?post=33629"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}