{"id":34709,"date":"2025-03-11T14:36:02","date_gmt":"2025-03-11T06:36:02","guid":{"rendered":"https:\/\/www.yunshan.net\/blog\/?p=34709"},"modified":"2025-03-11T14:36:02","modified_gmt":"2025-03-11T06:36:02","slug":"%e5%a6%82%e4%bd%95%e5%88%a9%e7%94%a8ebpf%e8%bf%9b%e8%a1%8c%e5%86%85%e5%ad%98%e7%ae%a1%e7%90%86%e4%bc%98%e5%8c%96%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.yunshan.net\/blog\/archives\/34709.html","title":{"rendered":"\u5982\u4f55\u5229\u7528eBPF\u8fdb\u884c\u5185\u5b58\u7ba1\u7406\u4f18\u5316\uff1f"},"content":{"rendered":"<p style=\"text-align: center;\">\n<p><img decoding=\"async\" src=\"https:\/\/www.yunshan.net\/blog\/wp-content\/uploads\/2025\/03\/d2vPp.jpg\" alt=\"\u5982\u4f55\u5229\u7528eBPF\u8fdb\u884c\u5185\u5b58\u7ba1\u7406\u4f18\u5316\uff1f\" ><\/p>\n<\/p>\n<p>\u5728\u4e91\u8ba1\u7b97\u548c\u5bb9\u5668\u5316\u6280\u672f\u5e2d\u5377\u5168\u7403\u7684\u4eca\u5929\uff0c\u7cfb\u7edf\u8d44\u6e90\u7684\u7cbe\u7ec6\u5316\u7ba1\u7406\u5df2\u6210\u4e3a\u5f00\u53d1\u8005\u9762\u4e34\u7684\u6838\u5fc3\u6311\u6218\u3002\u7279\u522b\u662f\u5185\u5b58\u7ba1\u7406\u8fd9\u4e2a&rdquo;\u6c89\u9ed8\u7684\u6027\u80fd\u6740\u624b&rdquo;\uff0c\u4f20\u7edf\u5de5\u5177\u5f80\u5f80\u50cf\u5728\u9ed1\u6697\u4e2d\u4f7f\u7528\u624b\u7535\u7b52\u2014\u2014\u53ea\u80fd\u7167\u4eae\u5c40\u90e8\uff0c\u5374\u65e0\u6cd5\u6355\u6349\u5185\u5b58\u788e\u7247\u3001\u6cc4\u6f0f\u7b49\u95ee\u9898\u7684\u5168\u8c8c\u3002\u5f53\u67d0\u5927\u578b\u7535\u5546\u5e73\u53f0\u5728\u4fc3\u9500\u671f\u95f4\u7a81\u9047OOM\uff08\u5185\u5b58\u6ea2\u51fa\uff09\u5bfc\u81f4\u670d\u52a1\u4e2d\u65ad\uff0c\u8fd0\u7ef4\u56e2\u961f\u82b1\u8d39\u6570\u5c0f\u65f6\u624d\u5b9a\u4f4d\u5230\u95ee\u9898\u6839\u6e90\u65f6\uff0c\u5f00\u53d1\u8005\u4eec\u5f00\u59cb\u610f\u8bc6\u5230\uff1a<strong>\u6211\u4eec\u9700\u8981X\u5149\u822c\u7684\u5185\u5b58\u89c2\u6d4b\u80fd\u529b<\/strong>\u3002<\/p>\n<p>\u8fd9\u5c31\u662f<a href=\"https:\/\/www.yunshan.net\/\"   target=\"_blank\" style=\"color:blue\">eBPF<\/a>\u6280\u672f\u95ea\u8000\u7684\u821e\u53f0\u3002\u8fd9\u4e2a\u66fe\u88abLinus Torvalds\u79f0\u4e3a&rdquo;Linux\u53f2\u4e0a\u6700\u91cd\u8981\u7684\u9769\u65b0&rdquo;\u7684\u6280\u672f\u6808\uff0c\u6b63\u5728\u91cd\u65b0\u5b9a\u4e49\u7cfb\u7edf\u53ef\u89c2\u6d4b\u6027\u7684\u8fb9\u754c\u3002\u4e0d\u540c\u4e8e\u4f20\u7edf\u7684\u9759\u6001\u63d2\u6869\u65b9\u5f0f\uff0c<strong><a href=\"https:\/\/www.yunshan.net\/\"   target=\"_blank\" style=\"color:blue\">eBPF<\/a>\u5141\u8bb8\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u6ce8\u5165\u89c2\u6d4b\u903b\u8f91<\/strong>\uff0c\u8fd9\u79cd\u80fd\u529b\u5728\u5185\u5b58\u7ba1\u7406\u9886\u57df\u6b63\u5f00\u542f\u4e00\u573a\u9759\u9ed8\u7684\u9769\u547d\u3002\u4ece\u5b57\u8282\u8df3\u52a8\u5355\u96c6\u7fa4\u7ba1\u7406\u767e\u4e07\u5bb9\u5668\u7684\u5b9e\u8df5\uff0c\u5230Google\u6570\u636e\u4e2d\u5fc3\u8282\u770120%\u5185\u5b58\u5360\u7528\u7684\u6848\u4f8b\uff0ceBPF\u6b63\u5728\u8bc1\u660e\uff1a<strong>\u5185\u5b58\u4f18\u5316\u53ef\u4ee5\u50cf\u5916\u79d1\u624b\u672f\u822c\u7cbe\u51c6<\/strong>\u3002<\/p>\n<hr>\n<h3 id=\"\u4e00-ebpf\u6280\u672f\u91cd\u5851\u5185\u5b58\u89c2\u6d4b\u7ef4\u5ea6\">\u4e00\u3001eBPF\u6280\u672f\u91cd\u5851\u5185\u5b58\u89c2\u6d4b\u7ef4\u5ea6<\/h3>\n<p>\u4f20\u7edf\u5185\u5b58\u5206\u6790\u5de5\u5177\u5982Valgrind\u6216perf\u5b58\u5728\u660e\u663e\u7684\u5c40\u9650\u6027\uff1a\u8981\u4e48\u9700\u8981\u91cd\u542f\u670d\u52a1\uff0c\u8981\u4e48\u91c7\u6837\u7cbe\u5ea6\u4e0d\u8db3\u3002eBPF\u901a\u8fc7<strong>\u52a8\u6001\u52a0\u8f7d\u7684\u5b89\u5168\u6c99\u7bb1\u7a0b\u5e8f<\/strong>\uff0c\u5b9e\u73b0\u4e86\u5bf9\u5185\u5b58\u4e8b\u4ef6\u7684\u7eb3\u7c73\u7ea7\u89c2\u6d4b\u3002Linux\u5185\u6838\u7ef4\u62a4\u8005Brendan Gregg\u5f00\u53d1\u7684memleak\u5de5\u5177\u5c31\u662f\u5178\u578b\u4ee3\u8868\uff0c\u5b83\u80fd\u6301\u7eed\u8ddf\u8e2a\u5185\u5b58\u5206\u914d\/\u91ca\u653e\u8c03\u7528\u6808\uff0c\u5c31\u50cf\u7ed9\u5185\u5b58\u64cd\u4f5c\u5b89\u88c5\u884c\u8f66\u8bb0\u5f55\u4eea\u3002<\/p>\n<p><strong>\u5173\u952e\u7a81\u7834\u70b9\u5728\u4e8e\u4e09\u70b9<\/strong>\uff1a<\/p>\n<ol>\n<li>\u5b9e\u65f6\u6355\u83b7kmalloc\/vmalloc\u7b4964\u4e2a\u5185\u5b58\u76f8\u5173\u51fd\u6570\n<\/li>\n<li>\u6784\u5efa\u5bf9\u8c61\u751f\u547d\u5468\u671f\u7684\u65f6\u95f4\u5e8f\u5217\u56fe\u8c31\n<\/li>\n<li>\u667a\u80fd\u8bc6\u522b\u672a\u914d\u5bf9\u91ca\u653e\u7684\u5185\u5b58\u5757\n<\/li>\n<\/ol>\n<p>\u67d0\u91d1\u878d\u79d1\u6280\u516c\u53f8\u4f7f\u7528\u8be5\u5de5\u5177\u540e\uff0c\u5728\u5343\u4e07\u7ea7QPS\u7684\u652f\u4ed8\u7cfb\u7edf\u4e2d\uff0c\u6210\u529f\u5b9a\u4f4d\u5230\u67d0\u5f02\u6b65\u4efb\u52a1\u961f\u5217\u7684\u5185\u5b58\u6cc4\u6f0f\uff0c\u5c06GC\u505c\u987f\u65f6\u95f4\u4ece200ms\u964d\u81f350ms\u4ee5\u5185\u3002<\/p>\n<hr>\n<h3 id=\"\u4e8c-\u56db\u7ef4\u4f18\u5316\u6cd5-\u4ece\u89c2\u6d4b\u5230\u5e72\u9884\u7684\u95ed\u73af\">\u4e8c\u3001\u56db\u7ef4\u4f18\u5316\u6cd5\uff1a\u4ece\u89c2\u6d4b\u5230\u5e72\u9884\u7684\u95ed\u73af<\/h3>\n<h4 id=\"2-1-\u5185\u5b58\u5206\u914d\u6a21\u5f0f\u4f18\u5316\">2.1 \u5185\u5b58\u5206\u914d\u6a21\u5f0f\u4f18\u5316<\/h4>\n<p>\u901a\u8fc7<strong>slab\u5206\u914d\u5668\u8ffd\u8e2a<\/strong>\uff0ceBPF\u53ef\u4ee5\u7ed8\u5236\u5bf9\u8c61\u5c3a\u5bf8\u7684\u70ed\u529b\u5206\u5e03\u56fe\u3002\u67d0\u89c6\u9891\u5904\u7406\u5e73\u53f0\u53d1\u73b0\uff0c80%\u7684\u5185\u5b58\u7533\u8bf7\u96c6\u4e2d\u5728512KB-1MB\u533a\u95f4\uff0c\u4f46\u5185\u6838\u9ed8\u8ba4\u7684slab\u5206\u7c7b\u5bfc\u81f4\u5927\u91cf\u5185\u90e8\u788e\u7247\u3002\u901a\u8fc7<strong>\u52a8\u6001\u8c03\u6574SLUB\u5206\u914d\u5668\u53c2\u6570<\/strong>\uff0c\u5185\u5b58\u5229\u7528\u7387\u63d0\u534737%\u3002<\/p>\n<pre><code class=\"language-c\">\/\/ \u793a\u4f8b\uff1aeBPF\u7a0b\u5e8f\u8ddf\u8e2akmalloc\u8c03\u7528  \r\nSEC(&quot;kprobe\/kmalloc&quot;)  \r\nint BPF_KPROBE(kmalloc_entry, size_t size) {  \r\nu64 pid = bpf_get_current_pgid();  \r\nbpf_map_update_elem(&amp;alloc_map, &amp;pid, &amp;size);  \r\nreturn 0;  \r\n}  \r\n<\/code><\/pre>\n<h4 id=\"2-2-\u9875\u9762\u56de\u6536\u667a\u80fd\u51b3\u7b56\">2.2 \u9875\u9762\u56de\u6536\u667a\u80fd\u51b3\u7b56<\/h4>\n<p>\u4f20\u7edfkswapd\u673a\u5236\u50cf\u76f2\u4eba\u6478\u8c61\uff0c\u800ceBPF\u652f\u6301\u7684<strong>PSI\uff08Pressure Stall Information\uff09\u6307\u6807<\/strong>\u80fd\u7cbe\u786e\u91cf\u5316\u5185\u5b58\u538b\u529b\u3002\u5f53\u76d1\u6d4b\u5230\u7279\u5b9acgroup\u7684\u67d0\u4e9b\u5185\u5b58\u987560\u79d2\u672a\u88ab\u8bbf\u95ee\uff0c\u81ea\u52a8\u89e6\u53d1\u5b9a\u5236\u5316\u56de\u6536\u7b56\u7565\u3002\u8fd9\u5728\u5bb9\u5668\u5316\u73af\u5883\u4e2d\u6548\u679c\u663e\u8457\uff0c\u67d0\u4e91\u5382\u5546\u636e\u6b64\u5b9e\u73b0\u6df7\u5408\u90e8\u7f72\u573a\u666f\u7684\u5185\u5b58\u56de\u6536\u6548\u7387\u63d0\u53474\u500d\u3002<\/p>\n<h4 id=\"2-3-numa\u4eb2\u548c\u6027\u8c03\u4f18\">2.3 NUMA\u4eb2\u548c\u6027\u8c03\u4f18<\/h4>\n<p>\u901a\u8fc7<strong>\u6355\u6349\u8de8\u8282\u70b9\u5185\u5b58\u8bbf\u95ee\u4e8b\u4ef6<\/strong>\uff0ceBPF\u53ef\u751f\u6210NUMA\u62d3\u6251\u70ed\u56fe\u3002\u67d0HPC\u96c6\u7fa4\u4f7f\u7528\u8be5\u6280\u672f\u540e\uff0c\u5c06\u8de8NUMA\u8282\u70b9\u7684\u5185\u5b58\u8bbf\u95ee\u6bd4\u4f8b\u4ece28%\u964d\u81f37%\uff0c\u4efb\u52a1\u6267\u884c\u65f6\u95f4\u7f29\u77ed19%\u3002<\/p>\n<h4 id=\"2-4-\u7528\u6237\u6001\u5185\u5b58\u6cbb\u7406\">2.4 \u7528\u6237\u6001\u5185\u5b58\u6cbb\u7406<\/h4>\n<p>\u501f\u52a9uprobe\u548cUSDT\u63a2\u9488\uff0ceBPF\u53ef\u4ee5\u7a7f\u900fJVM\/Go Runtime\u7684\u5185\u5b58\u9ed1\u76d2\u3002\u4f8b\u5982\u8ffd\u8e2aGolang\u7684GC\u5faa\u73af\uff1a\u5f53\u76d1\u6d4b\u5230\u8d85\u8fc75\u6b21\u8fde\u7eedGC\u4ecd\u65e0\u6cd5\u91ca\u653e\u8db3\u591f\u5185\u5b58\u65f6\uff0c\u81ea\u52a8\u6269\u5c55\u5806\u5927\u5c0f\u907f\u514dOOM\u3002\u67d0\u793e\u4ea4\u5e73\u53f0\u5e94\u7528\u6b64\u7b56\u7565\u540e\uff0c\u5bb9\u5668\u5d29\u6e83\u7387\u4e0b\u964d83%\u3002<\/p>\n<hr>\n<h3 id=\"\u4e09-\u751f\u4ea7\u73af\u5883\u4e0b\u7684\u6700\u4f73\u5b9e\u8df5\">\u4e09\u3001\u751f\u4ea7\u73af\u5883\u4e0b\u7684\u6700\u4f73\u5b9e\u8df5<\/h3>\n<h4 id=\"3-1-\u5b89\u5168\u9632\u62a4\u673a\u5236\">3.1 \u5b89\u5168\u9632\u62a4\u673a\u5236<\/h4>\n<p>\u5728\u5185\u5b58\u654f\u611f\u7684\u76d1\u63a7\u573a\u666f\uff0c\u5fc5\u987b\u8bbe\u7f6e<strong>\u6307\u4ee4\u5468\u671f\u9650\u5236<\/strong>\u548c\u5806\u6808\u6df1\u5ea6\u68c0\u6d4b\u3002\u63a8\u8350\u91c7\u7528BPF\u9a8c\u8bc1\u5668\u7684\u4e25\u683c\u6a21\u5f0f\uff0c\u62d2\u7edd\u4efb\u4f55\u53ef\u80fd\u5bfc\u81f4\u5185\u5b58\u8d8a\u754c\u7684\u64cd\u4f5c\u3002<\/p>\n<h4 id=\"3-2-\u6027\u80fd\u635f\u8017\u63a7\u5236\">3.2 \u6027\u80fd\u635f\u8017\u63a7\u5236<\/h4>\n<p>\u901a\u8fc7\u91c7\u6837\u7387\u548c\u8fc7\u6ee4\u89c4\u5219\u7684\u52a8\u6001\u8c03\u6574\uff0c\u5c06\u989d\u5916\u5f00\u9500\u63a7\u5236\u57282%\u4ee5\u5185\u3002\u4f8b\u5982\u5bf9\u9ad8\u9891\u7684\u9875\u9519\u8bef\u4e8b\u4ef6\uff0c\u91c7\u75281%\u7684\u91c7\u6837\u7387\u914d\u5408Bloom Filter\u9884\u5904\u7406\u3002<\/p>\n<h4 id=\"3-3-\u53ef\u89c6\u5316\u5206\u6790\u4f53\u7cfb\">3.3 \u53ef\u89c6\u5316\u5206\u6790\u4f53\u7cfb<\/h4>\n<p>\u5efa\u7acb\u4e09\u5c42\u89c2\u6d4b\u4f53\u7cfb\uff1a<\/p>\n<ul>\n<li><strong>\u5b9e\u65f6\u5c42<\/strong>\uff1a<a href=\"https:\/\/www.yunshan.net\/\"   target=\"_blank\" style=\"color:blue\">Prometheus<\/a>+Granfa\u5c55\u793a\u5185\u5b58\u6c34\u4f4d\n<\/li>\n<li><strong>\u8bca\u65ad\u5c42<\/strong>\uff1aeBPF\u4e8b\u4ef6\u5173\u8054FlameGraph\n<\/li>\n<li><strong>\u9884\u6d4b\u5c42<\/strong>\uff1a\u673a\u5668\u5b66\u4e60\u6a21\u578b\u9884\u6d4b\u5185\u5b58\u8d8b\u52bf\n<\/li>\n<\/ul>\n<p>\u67d0\u81ea\u52a8\u9a7e\u9a76\u7cfb\u7edf\u901a\u8fc7\u8be5\u4f53\u7cfb\uff0c\u63d0\u524d30\u5206\u949f\u9884\u6d4b\u5230\u611f\u77e5\u6a21\u5757\u7684\u5185\u5b58\u62d0\u70b9\uff0c\u6210\u529f\u907f\u514d\u9ad8\u901f\u573a\u666f\u4e0b\u7684\u8ba1\u7b97\u8d44\u6e90\u67af\u7aed\u3002<\/p>\n<hr>\n<h3 id=\"\u56db-\u7a81\u7834\u4f20\u7edf\u8fb9\u754c\u7684\u521b\u65b0\u5e94\u7528\">\u56db\u3001\u7a81\u7834\u4f20\u7edf\u8fb9\u754c\u7684\u521b\u65b0\u5e94\u7528<\/h3>\n<h4 id=\"4-1-\u6df7\u5408\u5185\u5b58\u67b6\u6784\u7ba1\u7406\">4.1 \u6df7\u5408\u5185\u5b58\u67b6\u6784\u7ba1\u7406<\/h4>\n<p>\u5728PMEM\uff08\u6301\u4e45\u5185\u5b58\uff09\u4e0eDRAM\u6df7\u5408\u90e8\u7f72\u4e2d\uff0ceBPF\u53ef\u81ea\u52a8\u8bc6\u522b\u51b7\u70ed\u6570\u636e\u3002\u5f53\u76d1\u6d4b\u5230\u67d0\u4e9b\u5185\u5b58\u9875\u540c\u65f6\u5177\u6709\u9ad8\u8bbf\u95ee\u9891\u7387\u548c\u6301\u4e45\u5316\u9700\u6c42\u65f6\uff0c\u89e6\u53d1\u81ea\u52a8\u8fc1\u79fb\u5230PMEM\u533a\u57df\u3002\u82f1\u7279\u5c14\u5728\u67d0\u6570\u636e\u5e93\u6d4b\u8bd5\u4e2d\uff0c\u901a\u8fc7\u8be5\u65b9\u6848\u5c06\u6301\u4e45\u5316\u5f00\u9500\u964d\u4f4e60%\u3002<\/p>\n<h4 id=\"4-2-\u5185\u5b58\u53bb\u91cd\u667a\u80fd\u5316\">4.2 \u5185\u5b58\u53bb\u91cd\u667a\u80fd\u5316<\/h4>\n<p>\u501f\u9274VMware\u7684\u900f\u660e\u9875\u5171\u4eab\u601d\u60f3\uff0ceBPF\u80fd\u5728\u5bb9\u5668\u95f4\u5b9e\u65bd<strong>\u5185\u5bb9\u611f\u77e5\u7684\u5185\u5b58\u53bb\u91cd<\/strong>\u3002\u901a\u8fc7SHA-1\u54c8\u5e0c\u6bd4\u5bf9\u5185\u5b58\u9875\u5185\u5bb9\uff0c\u5bf9\u91cd\u590d\u7387\u8d85\u8fc7\u9608\u503c\u7684\u5bb9\u5668\u81ea\u52a8\u542f\u7528KSM\uff08\u5185\u6838\u540c\u9875\u5408\u5e76\uff09\u3002\u67d0PaaS\u5e73\u53f0\u5e94\u7528\u540e\uff0c\u8282\u70b9\u5185\u5b58\u5bc6\u5ea6\u63d0\u53473\u500d\u3002<\/p>\n<h4 id=\"4-3-\u5b89\u5168\u5185\u5b58\u9632\u62a4\">4.3 \u5b89\u5168\u5185\u5b58\u9632\u62a4<\/h4>\n<p>\u7ed3\u5408ARM\u7684MTE\uff08\u5185\u5b58\u6807\u8bb0\u6269\u5c55\uff09\u7279\u6027\uff0ceBPF\u80fd\u6784\u5efa\u52a8\u6001\u7684use-after-free\u68c0\u6d4b\u7f51\u3002\u5f53\u68c0\u6d4b\u5230\u91ca\u653e\u540e\u7684\u5185\u5b58\u88ab\u5f02\u5e38\u8bbf\u95ee\u65f6\uff0c\u5373\u65f6\u89e6\u53d1\u8fdb\u7a0b\u9694\u79bb\u3002\u5fae\u8f6f\u5728Azure\u4e3b\u673a\u4e2d\u90e8\u7f72\u8be5\u65b9\u6848\u540e\uff0c\u6210\u529f\u62e6\u622a\u591a\u4e2a0day\u6f0f\u6d1e\u5229\u7528\u3002<\/p>\n<hr>\n<p>\u5728\u8fd9\u573a\u5185\u5b58\u7ba1\u7406\u7684\u9769\u547d\u4e2d\uff0ceBPF\u5c31\u50cf\u7ed9\u7cfb\u7edf\u5de5\u7a0b\u5e08\u914d\u4e0a\u4e86\u91cf\u5b50\u8ba1\u7b97\u673a\u3002\u5b83\u4e0d\u66ff\u4ee3\u4f20\u7edf\u7684malloc\/free\uff0c\u800c\u662f\u6784\u5efa\u4e86\u4e00\u4e2a\u4ece\u91cf\u5b50\u6001\u89c2\u6d4b\u5230\u7ecf\u5178\u6001\u5e72\u9884\u7684\u5b8c\u6574\u95ed\u73af\u3002\u5f53\u8d8a\u6765\u8d8a\u591a\u7684\u4f01\u4e1a\u5f00\u59cb\u5728\u5185\u5b58\u603b\u7ebf\u4e0a\u90e8\u7f72\u8fd9\u4e9b&rdquo;\u7eb3\u7c73\u673a\u5668\u4eba&rdquo;\uff0c\u6211\u4eec\u6b63\u5728\u89c1\u8bc1\u7cfb\u7edf\u8f6f\u4ef6\u4ece\u673a\u68b0\u5316\u65f6\u4ee3\u5411\u667a\u80fd\u5316\u65f6\u4ee3\u7684\u8dc3\u8fc1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u4e91\u8ba1\u7b97\u548c\u5bb9\u5668\u5316\u6280\u672f\u5e2d\u5377\u5168\u7403\u7684\u4eca\u5929\uff0c\u7cfb\u7edf\u8d44\u6e90\u7684\u7cbe\u7ec6\u5316\u7ba1\u7406\u5df2\u6210\u4e3a\u5f00\u53d1\u8005\u9762\u4e34\u7684\u6838\u5fc3\u6311\u6218\u3002\u7279\u522b\u662f\u5185\u5b58\u7ba1\u7406\u8fd9\u4e2a&rdquo;\u6c89\u9ed8\u7684\u6027\u80fd\u6740\u624b&rdquo;\uff0c\u4f20\u7edf\u5de5\u5177\u5f80\u5f80\u50cf\u5728\u9ed1\u6697\u4e2d\u4f7f\u7528\u624b\u7535\u7b52\u2014\u2014\u53ea\u80fd\u7167\u4eae\u5c40\u90e8\uff0c\u5374\u65e0\u6cd5\u6355\u6349\u5185\u5b58\u788e\u7247\u3001\u6cc4\u6f0f\u7b49\u95ee\u9898\u7684\u5168\u8c8c\u3002\u5f53\u67d0\u5927\u578b\u7535\u5546\u5e73\u53f0\u5728\u4fc3\u9500\u671f\u95f4\u7a81\u9047OOM\uff08\u5185\u5b58\u6ea2\u51fa\uff09\u5bfc\u81f4\u670d\u52a1\u4e2d\u65ad\uff0c\u8fd0\u7ef4\u56e2\u961f\u82b1\u8d39\u6570\u5c0f\u65f6\u624d\u5b9a\u4f4d\u5230\u95ee\u9898\u6839\u6e90\u65f6\uff0c\u5f00\u53d1\u8005\u4eec\u5f00\u59cb\u610f\u8bc6\u5230\uff1a\u6211\u4eec\u9700\u8981X\u5149\u822c\u7684\u5185\u5b58\u89c2\u6d4b\u80fd\u529b\u3002 \u8fd9\u5c31\u662feBPF\u6280\u672f\u95ea\u8000\u7684\u821e\u53f0\u3002\u8fd9\u4e2a\u66fe\u88abLinus Torvalds\u79f0\u4e3a&rdquo;Linux\u53f2\u4e0a\u6700\u91cd\u8981\u7684\u9769\u65b0&rdquo;\u7684\u6280\u672f\u6808\uff0c\u6b63\u5728\u91cd\u65b0\u5b9a\u4e49\u7cfb\u7edf\u53ef\u89c2\u6d4b\u6027\u7684\u8fb9\u754c\u3002\u4e0d\u540c\u4e8e\u4f20\u7edf\u7684\u9759\u6001\u63d2\u6869\u65b9\u5f0f\uff0ceBPF\u5141\u8bb8\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u6ce8\u5165\u89c2\u6d4b\u903b\u8f91\uff0c\u8fd9\u79cd\u80fd\u529b\u5728\u5185\u5b58\u7ba1\u7406\u9886\u57df\u6b63\u5f00\u542f\u4e00\u573a\u9759\u9ed8\u7684\u9769\u547d\u3002\u4ece\u5b57\u8282\u8df3\u52a8\u5355\u96c6\u7fa4\u7ba1\u7406\u767e\u4e07\u5bb9\u5668\u7684\u5b9e\u8df5\uff0c\u5230Google\u6570\u636e\u4e2d\u5fc3\u8282\u770120%\u5185\u5b58\u5360\u7528\u7684\u6848\u4f8b\uff0ceBPF\u6b63\u5728\u8bc1\u660e\uff1a\u5185\u5b58\u4f18\u5316\u53ef\u4ee5\u50cf\u5916\u79d1\u624b\u672f\u822c\u7cbe\u51c6\u3002 \u4e00\u3001eBPF\u6280\u672f\u91cd\u5851\u5185\u5b58\u89c2\u6d4b\u7ef4\u5ea6 \u4f20\u7edf\u5185\u5b58\u5206\u6790\u5de5\u5177\u5982Valgrind\u6216perf\u5b58\u5728\u660e\u663e\u7684\u5c40\u9650\u6027\uff1a\u8981\u4e48\u9700\u8981\u91cd\u542f\u670d\u52a1\uff0c\u8981\u4e48\u91c7\u6837\u7cbe\u5ea6\u4e0d\u8db3\u3002eBPF\u901a\u8fc7\u52a8\u6001\u52a0\u8f7d\u7684\u5b89\u5168\u6c99\u7bb1\u7a0b\u5e8f\uff0c\u5b9e\u73b0\u4e86\u5bf9\u5185\u5b58\u4e8b\u4ef6\u7684\u7eb3\u7c73\u7ea7\u89c2\u6d4b\u3002Linux\u5185\u6838\u7ef4\u62a4\u8005Brendan Gregg\u5f00\u53d1\u7684memleak\u5de5\u5177\u5c31\u662f\u5178\u578b\u4ee3\u8868\uff0c\u5b83\u80fd\u6301\u7eed\u8ddf\u8e2a\u5185\u5b58\u5206\u914d\/\u91ca\u653e\u8c03\u7528\u6808\uff0c\u5c31\u50cf\u7ed9\u5185\u5b58\u64cd\u4f5c\u5b89\u88c5\u884c\u8f66\u8bb0\u5f55\u4eea\u3002 \u5173\u952e\u7a81\u7834\u70b9\u5728\u4e8e\u4e09\u70b9\uff1a \u5b9e\u65f6\u6355\u83b7kmalloc\/vmalloc\u7b4964\u4e2a\u5185\u5b58\u76f8\u5173\u51fd\u6570 \u6784\u5efa\u5bf9\u8c61\u751f\u547d\u5468\u671f\u7684\u65f6\u95f4\u5e8f\u5217\u56fe\u8c31 \u667a\u80fd\u8bc6\u522b\u672a\u914d\u5bf9\u91ca\u653e\u7684\u5185\u5b58\u5757 \u67d0\u91d1\u878d\u79d1\u6280\u516c\u53f8\u4f7f\u7528\u8be5\u5de5\u5177\u540e\uff0c\u5728\u5343\u4e07\u7ea7QPS\u7684\u652f\u4ed8\u7cfb\u7edf\u4e2d\uff0c\u6210\u529f\u5b9a\u4f4d\u5230\u67d0\u5f02\u6b65\u4efb\u52a1\u961f\u5217\u7684\u5185\u5b58\u6cc4\u6f0f\uff0c\u5c06GC\u505c\u987f\u65f6\u95f4\u4ece200ms\u964d\u81f350ms\u4ee5\u5185\u3002 \u4e8c\u3001\u56db\u7ef4\u4f18\u5316\u6cd5\uff1a\u4ece\u89c2\u6d4b\u5230\u5e72\u9884\u7684\u95ed\u73af 2.1 \u5185\u5b58\u5206\u914d\u6a21\u5f0f\u4f18\u5316 \u901a\u8fc7slab\u5206\u914d\u5668\u8ffd\u8e2a\uff0ceBPF\u53ef\u4ee5\u7ed8\u5236\u5bf9\u8c61\u5c3a\u5bf8\u7684\u70ed\u529b\u5206\u5e03\u56fe\u3002\u67d0\u89c6\u9891\u5904\u7406\u5e73\u53f0\u53d1\u73b0\uff0c80%\u7684\u5185\u5b58\u7533\u8bf7\u96c6\u4e2d\u5728512KB-1MB\u533a\u95f4\uff0c\u4f46\u5185\u6838\u9ed8\u8ba4\u7684slab\u5206\u7c7b\u5bfc\u81f4\u5927\u91cf\u5185\u90e8\u788e\u7247\u3002\u901a\u8fc7\u52a8\u6001\u8c03\u6574SLUB\u5206\u914d\u5668\u53c2\u6570\uff0c\u5185\u5b58\u5229\u7528\u7387\u63d0\u534737%\u3002 \/\/ \u793a\u4f8b\uff1aeBPF\u7a0b\u5e8f\u8ddf\u8e2akmalloc\u8c03\u7528 SEC(&quot;kprobe\/kmalloc&quot;) int BPF_KPROBE(kmalloc_entry, size_t size) { u64 pid = bpf_get_current_pgid(); bpf_map_update_elem(&amp;alloc_map, &amp;pid, &amp;size); return 0; } 2.2 \u9875\u9762\u56de\u6536\u667a\u80fd\u51b3\u7b56 \u4f20\u7edfkswapd\u673a\u5236\u50cf\u76f2\u4eba\u6478\u8c61\uff0c\u800ceBPF\u652f\u6301\u7684PSI\uff08Pressure Stall Information\uff09\u6307\u6807\u80fd\u7cbe\u786e\u91cf\u5316\u5185\u5b58\u538b\u529b\u3002\u5f53\u76d1\u6d4b\u5230\u7279\u5b9acgroup\u7684\u67d0\u4e9b\u5185\u5b58\u987560\u79d2\u672a\u88ab\u8bbf\u95ee\uff0c\u81ea\u52a8\u89e6\u53d1\u5b9a\u5236\u5316\u56de\u6536\u7b56\u7565\u3002\u8fd9\u5728\u5bb9\u5668\u5316\u73af\u5883\u4e2d\u6548\u679c\u663e\u8457\uff0c\u67d0\u4e91\u5382\u5546\u636e\u6b64\u5b9e\u73b0\u6df7\u5408\u90e8\u7f72\u573a\u666f\u7684\u5185\u5b58\u56de\u6536\u6548\u7387\u63d0\u53474\u500d\u3002 2.3 NUMA\u4eb2\u548c\u6027\u8c03\u4f18 \u901a\u8fc7\u6355\u6349\u8de8\u8282\u70b9\u5185\u5b58\u8bbf\u95ee\u4e8b\u4ef6\uff0ceBPF\u53ef\u751f\u6210NUMA\u62d3\u6251\u70ed\u56fe\u3002\u67d0HPC\u96c6\u7fa4\u4f7f\u7528\u8be5\u6280\u672f\u540e\uff0c\u5c06\u8de8NUMA\u8282\u70b9\u7684\u5185\u5b58\u8bbf\u95ee\u6bd4\u4f8b\u4ece28%\u964d\u81f37%\uff0c\u4efb\u52a1\u6267\u884c\u65f6\u95f4\u7f29\u77ed19%\u3002 2.4 \u7528\u6237\u6001\u5185\u5b58\u6cbb\u7406 \u501f\u52a9uprobe\u548cUSDT\u63a2\u9488\uff0ceBPF\u53ef\u4ee5\u7a7f\u900fJVM\/Go Runtime\u7684\u5185\u5b58\u9ed1\u76d2\u3002\u4f8b\u5982\u8ffd\u8e2aGolang\u7684GC\u5faa\u73af\uff1a\u5f53\u76d1\u6d4b\u5230\u8d85\u8fc75\u6b21\u8fde\u7eedGC\u4ecd\u65e0\u6cd5\u91ca\u653e\u8db3\u591f\u5185\u5b58\u65f6\uff0c\u81ea\u52a8\u6269\u5c55\u5806\u5927\u5c0f\u907f\u514dOOM\u3002\u67d0\u793e\u4ea4\u5e73\u53f0\u5e94\u7528\u6b64\u7b56\u7565\u540e\uff0c\u5bb9\u5668\u5d29\u6e83\u7387\u4e0b\u964d83%\u3002 \u4e09\u3001\u751f\u4ea7\u73af\u5883\u4e0b\u7684\u6700\u4f73\u5b9e\u8df5 3.1 \u5b89\u5168\u9632\u62a4\u673a\u5236 \u5728\u5185\u5b58\u654f\u611f\u7684\u76d1\u63a7\u573a\u666f\uff0c\u5fc5\u987b\u8bbe\u7f6e\u6307\u4ee4\u5468\u671f\u9650\u5236\u548c\u5806\u6808\u6df1\u5ea6\u68c0\u6d4b\u3002\u63a8\u8350\u91c7\u7528BPF\u9a8c\u8bc1\u5668\u7684\u4e25\u683c\u6a21\u5f0f\uff0c\u62d2\u7edd\u4efb\u4f55\u53ef\u80fd\u5bfc\u81f4\u5185\u5b58\u8d8a\u754c\u7684\u64cd\u4f5c\u3002 3.2 \u6027\u80fd\u635f\u8017\u63a7\u5236 \u901a\u8fc7\u91c7\u6837\u7387\u548c\u8fc7\u6ee4\u89c4\u5219\u7684\u52a8\u6001\u8c03\u6574\uff0c\u5c06\u989d\u5916\u5f00\u9500\u63a7\u5236\u57282%\u4ee5\u5185\u3002\u4f8b\u5982\u5bf9\u9ad8\u9891\u7684\u9875\u9519\u8bef\u4e8b\u4ef6\uff0c\u91c7\u75281%\u7684\u91c7\u6837\u7387\u914d\u5408Bloom Filter\u9884\u5904\u7406\u3002 3.3 \u53ef\u89c6\u5316\u5206\u6790\u4f53\u7cfb [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":34710,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-34709","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\/34709","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=34709"}],"version-history":[{"count":1,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/34709\/revisions"}],"predecessor-version":[{"id":34711,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/34709\/revisions\/34711"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/media\/34710"}],"wp:attachment":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/media?parent=34709"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/categories?post=34709"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/tags?post=34709"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}