{"id":10005973,"date":"2022-07-22T11:38:10","date_gmt":"2022-07-22T03:38:10","guid":{"rendered":"https:\/\/ityet.com\/?p=10005973"},"modified":"2022-07-22T11:38:10","modified_gmt":"2022-07-22T03:38:10","slug":"%e5%85%a5%e9%97%a8%e5%8d%b3%e4%ba%ab%e5%8f%97%ef%bc%81coolbpf-%e7%a1%ac%e6%a0%b8%e6%8f%90%e5%8d%87-bpf-%e5%bc%80%e5%8f%91%e6%95%88%e7%8e%87-%e9%be%99%e8%9c%a5%e6%8a%80%e6%9c%af","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10005973","title":{"rendered":"\u5165\u95e8\u5373\u4eab\u53d7\uff01coolbpf \u786c\u6838\u63d0\u5347 BPF \u5f00\u53d1\u6548\u7387 | \u9f99\u8725\u6280\u672f"},"content":{"rendered":"<p>\u7b80\u4ecb\uff1a\u00a0\u5e72\u8d27\u5fc5\u5907\uff01\u4f55\u4e3a\u4eab\u53d7\u5f0f\u5f00\u53d1\uff1f\u7f16\u8005\u6309\uff1aBPF \u6280\u672f\u8fd8\u5728\u5982\u706b\u5982\u837c\u7684\u53d1\u5c55\u7740\uff0c\u672c\u6587\u5148\u901a\u8fc7\u5bf9 BPF \u77e5\u8bc6\u7684\u4ecb\u7ecd\uff0c\u5e26\u9886\u5927\u5bb6\u5165\u95e8 BPF\uff0c\u7136\u540e\u4ecb\u7ecd coolbpf \u7684\u8fdc\u7a0b\u7f16\u8bd1\uff08\u539f\u540d LCC\uff0cLibbpfCompilerCollection\uff09\uff0c\u610f\u4e3a\u9177\u73a9 BPF\uff0c\u76ee\u6807\u628a\u590d\u6742\u7684 BPF \u5f00\u53d1\u548c\u7f16\u8bd1\u8fc7\u7a0b\u7b80\u5316\uff0c\u672c\u6587\u8fd8\u4f1a\u4ee5\u4e00\u4e2a\u793a\u4f8b\u6765\u4f53\u9a8c coolbpf \u7684\u4eab\u53d7\u5f0f\u5f00\u53d1\u3002\u672c\u6587\u6574\u7406\u81ea\u9f99\u8725\u5927\u8bb2\u5802\u7b2c 20 \u671f\uff0c\u7cbe\u5f69\u5206\u4eab\u89c6\u9891\u56de\u653e\u5df2\u4e0a\u4f20\u81f3\u9f99\u8725\u5b98\u7f51\uff08\u9996\u9875-\u52a8\u6001-\u89c6\u9891\uff09\uff0c\u6b22\u8fce\u67e5\u770b\uff01<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042204643\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\" ><br \/>\u4e00\u3001 \u5f15\u8a00\u8981\u5b8c\u6210\u4e00\u4e2a BPF \u4e8c\u8fdb\u5236\u7a0b\u5e8f\u7684\u5f00\u53d1\uff0c\u9700\u8981\u642d\u5efa\u5f00\u53d1\u7f16\u8bd1\u73af\u5883\uff0c\u8981\u5173\u6ce8\u76ee\u6807\u7cfb\u7edf\u7684\u5185\u6838\u7248\u672c\u60c5\u51b5\uff0c\u9700\u8981\u638c\u63e1\u4ece BPF \u5185\u6838\u6001\u5230\u7528\u6237\u6001\u7a0b\u5e8f\u7684\u7f16\u5199\uff0c\u4ee5\u53ca\u5982\u4f55\u52a0\u8f7d\u3001\u7ed1\u5b9a\u81f3\u5bf9\u5e94\u7684 HOOK \u70b9\u7b49\u5f85\u4e8b\u4ef6\u89e6\u53d1\uff0c\u6700\u540e\u518d\u5bf9\u8f93\u51fa\u7684\u65e5\u5fd7\u53ca\u6570\u636e\u8fdb\u884c\u5904\u7406\u3002\u8fd9\u51e0\u4e2a\u8fc7\u7a0b\u5bf9\u4e8e\u4e00\u4e2a\u521a\u63a5\u89e6 BPF \u7684\u540c\u5b66\u4f1a\u611f\u89c9\u76f8\u5f53\u7e41\u7410\u3002\u672c\u6587\u5148\u901a\u8fc7\u5bf9 BPF \u77e5\u8bc6\u7684\u4ecb\u7ecd\uff0c\u5e26\u9886\u5927\u5bb6\u5165\u95e8BPF\uff0c\u7136\u540e\u4ecb\u7ecd coolbpf \u7684\u8fdc\u7a0b\u7f16\u8bd1\uff08\u539f\u540d LCC\uff0cLibbpfCompilerCollection\uff0c \u00a0\u610f\u4e3a\u9177\u73a9 BPF\uff0c\u76ee\u6807\u628a\u590d\u6742\u7684 BPF \u5f00\u53d1\u548c\u7f16\u8bd1\u8fc7\u7a0b\u7b80\u5316\uff09\uff0c\u4ee5\u4e00\u4e2a\u793a\u4f8b\u6765\u4f53\u9a8c coolbpf \u7684\u4eab\u53d7\u5f0f\u5f00\u53d1\u3002\u4e8c\u3001 BPF\u5165\u95e8BPF \u6700\u65e9\u5728 1992 \u5e74\u88ab\u63d0\u51fa\uff0c\u5f53\u65f6\u53eb\u4f2f\u514b\u5229\u5305\u8fc7\u6ee4\u5668\uff08Berkely Packet Filter\uff0c\u4e00\u822c\u79f0\u4e3acBPF\uff09\uff0c\u53f7\u79f0\u6bd4\u5f53\u65f6\u6700\u5148\u8fdb\u7684\u6570\u636e\u5305\u8fc7\u6ee4\u6280\u672f\u5feb 20 \u500d\uff0c\u4e3b\u8981\u5e94\u7528\u573a\u666f\u5728 tcpdump\u3001seccomp\u30022014\u5e74\uff0cAlexei Starovoitov \u5bf9 BPF \u8fdb\u884c\u5f7b\u5e95\u5730\u6539\u9020\uff0c\u63d0\u51fa Extended Berkeley Packet Filter (eBPF)\u3002eBPF \u6307\u4ee4\u66f4\u63a5\u8fd1\u786c\u4ef6\u7684 ISA\uff0c\u4fbf\u4e8e\u63d0\u5347\u6027\u80fd\uff0c\u63d0\u4f9b\u4e86\u53ef\u57fa\u4e8e\u7cfb\u7edf\u6216\u7a0b\u5e8f\u4e8b\u4ef6\u9ad8\u6548\u5b89\u5168\u6267\u884c\u7279\u5b9a\u4ee3\u7801\u7684\u901a\u7528\u80fd\u529b\uff0c\u901a\u7528\u80fd\u529b\u7684\u4f7f\u7528\u8005\u4e0d\u518d\u5c40\u9650\u4e8e\u5185\u6838\u5f00\u53d1\u8005\u3002\u5176\u4f7f\u7528\u573a\u666f\u4e0d\u518d\u4ec5\u4ec5\u662f\u7f51\u7edc\u5206\u6790\uff0c\u53ef\u4ee5\u57fa\u4e8e eBPF \u5f00\u53d1\u6027\u80fd\u5206\u6790\u3001\u7cfb\u7edf\u8ffd\u8e2a\u3001\u7f51\u7edc\u4f18\u5316\u7b49\u591a\u79cd\u7c7b\u578b\u7684\u5de5\u5177\u548c\u5e73\u53f0\u3002\u6211\u4eec\u901a\u5e38\u4e0d\u52a0\u533a\u5206\uff0c\u628a cBPF \u548c eBPF \u90fd\u79f0\u4e4b\u4e3a BPF\u30022.1 BPF \u77e5\u8bc6\u70b9\u603b\u7ed3\u5927\u5bb6\u90fd\u5728\u8c08 BPF\uff0c\u4ecb\u7ecdBPF\u7684\u6587\u7ae0\u4e5f\u5f88\u591a\uff0c\u8fd9\u91cc\u5148\u603b\u7ed3 BPF \u7684\u77e5\u8bc6\u70b9\uff0c\u6700\u540e\u6211\u4eec\u4ece\u6700\u57fa\u7840\u7684 BPF \u6307\u4ee4\u67b6\u6784\u53ca map \u548c prog type \u53bb\u4ecb\u7ecd\u5982\u4f55\u5feb\u901f\u5165\u95e8\u3002risc\u6307\u4ee4\u96c6\uff1a\u5305\u542b 11 \u4e2a 64 \u4f4d\u5bc4\u5b58\u5668 (R0 ~ R10)\u3002maps\uff1aBPF \u7a0b\u5e8f\u4e4b\u95f4\u6216\u5185\u6838\u53ca\u7528\u6237\u6001\u95f4\u6570\u636e\u4ea4\u4e92\u3002prog type\uff1aBPF \u7a0b\u5e8f\u7c7b\u578b\u7528\u6765\u786e\u5b9a\u7a0b\u5e8f\u529f\u80fd\u4ee5\u53ca\u7a0b\u5e8f attach \u5230\u4ec0\u4e48\u4f4d\u7f6e\u3002helper functions\uff1a\u901a\u8fc7\u8f85\u52a9\u51fd\u6570\u8bbf\u95ee\u5185\u6838\u6570\u636e\uff0c\u5982\u8bbf\u95ee task\u3001pid \u7b49\u3002jit\uff1a\u5c06 BPF \u7a0b\u5e8f\u7684\u5b57\u8282\u7801\u8f6c\u6362\u6210\u76ee\u6807\u673a\u7684\u673a\u5668\u7801\u3002object pinning\uff1a\u63d0\u4f9b BPF \u6587\u4ef6\u7cfb\u7edf\uff0c\u5ef6\u957f map \u548c prog \u7684\u751f\u547d\u5468\u671f\u3002tail call\uff1a\u4e00\u4e2aBPF\u7a0b\u5e8f\u53ef\u4ee5\u8c03\u7528\u53e6\u4e00\u4e2a BPF \u7a0b\u5e8f\uff0c\u5e76\u4e14\u8c03\u7528\u5b8c\u6210\u540e\u4e0d\u7528\u8fd4\u56de\u5230\u539f\u6765\u7684\u7a0b\u5e8f\u3002hardening\uff1a\u4fdd\u62a4 BPF \u7a0b\u5e8f\u548c\u5176\u4e8c\u8fdb\u5236\u7a0b\u5e8f\u4e0d\u88ab\u7834\u574f\uff08\u8bbe\u7f6e\u6210\u53ea\u8bfb\uff09\u30022.2 BPF \u53d1\u5c55\u6982\u51b5BPF \u7ecf\u8fc7\u51e0\u5341\u5e74\u7684\u53d1\u5c55\uff0c\u5df2\u7ecf\u4ece\u539f\u6765\u5355\u4e00\u7684\u529f\u80fd\u7528\u9014\uff0c\u5230\u5982\u4eca\u904d\u5e03\u5404\u4e2a\u9886\u57df\u7684\u5e94\u7528\uff0c\u5305\u62ec\u4e91\u539f\u751f\u3001\u4f01\u4e1a\u670d\u52a1\u5668\u3001\u5b89\u5168\u7cfb\u7edf\u7b49\u90fd\u5728\u8fd0\u7528\u8fd9\u4e00\u6280\u672f\uff0c\u670d\u52a1\u751f\u4ea7\u548c\u751f\u6d3b\u3002\u4e0b\u56fe\u662f BPF \u6280\u672f\u7684\u53d1\u5c55\u53f2\uff08\u56fe\u6e90\uff1a<a href=\"https:\/\/link.segmentfault.com\/?enc=IIF5V%2F8AHU8fTSEzPKnDBg%3D%3D.FUuD9w7q4IVU3ZW5Y%2F2yDAgQJtxjRw%2BfsdKcH6TJ0kcBNklAr9SMqsxVL4ApWsX8\" rel=\"nofollow\">https:\/\/zhuanlan.zhihu.com\/p\/&#8230;<\/a>\uff09\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042204644\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\" ><br \/>\u968f\u7740\u8d8a\u6765\u8d8a\u591a\u7684\u7279\u6027\u88ab\u5408\u5165\u5230 Linux \u5185\u6838\u793e\u533a\uff0cBPF \u652f\u6301\u7684\u529f\u80fd\u56e0\u4e3a\u8fd9\u4e9b\u7279\u6027\u52a0\u6301\uff0c\u5df2\u7ecf\u8d8a\u6765\u8d8a\u4e30\u5bcc\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042204645\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\" ><br \/>2.3 BPF \u548c\u5185\u6838\u6a21\u5757\u5bf9\u6bd4BPF \u7684\u4f18\u52bf\u662f\u7075\u6d3b\u3001\u5b89\u5168\u3002\u5728\u6ca1\u6709\u5f15\u5165 BPF \u4e4b\u524d\uff0c\u5982\u679c\u6211\u4eec\u60f3\u8981\u5b9e\u73b0\u4e00\u4e9b\u8ddf\u8e2a\u8bca\u65ad\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u4f7f\u7528 tracefs\/debugfs \u4e2d\u5bfc\u51fa\u7684\u6587\u4ef6\u7cfb\u7edf\u63a5\u53e3\uff0c\u6216\u8005\u7f16\u5199\u5185\u6838\u6a21\u5757\u63d2\u5165\u5230\u5185\u6838\u4e2d\u8fd0\u884c\u3002\u524d\u8005\u7684\u529f\u80fd\u8f83\u4e3a\u56fa\u5b9a\uff0c\u65e0\u6cd5\u7075\u6d3b\u5730\u5b9e\u73b0\u5bf9\u6570\u636e\u7684\u8fc7\u6ee4\uff1b\u540e\u8005\u867d\u7136\u7075\u6d3b\uff0c\u4f46\u5bb9\u6613\u5bfc\u81f4\u5185\u6838 crash\uff0c\u4e0d\u591f\u5b89\u5168\u3002ftrace \u548c kernel module \u7ed9\u6211\u4eec\u5f88\u5927\u7684\u81ea\u7531\u53bb\u6293\u53d6\u5185\u6838\u7684\u4e00\u4e9b\u4fe1\u606f\uff0c\u4f46\u662f\u5374\u5b58\u5728\u4e0d\u5c11\u5f0a\u7aef\u3002\u4e0b\u56fe\u662f\u5185\u6838\u6a21\u5757\u548c BPF \u7684\u5bf9\u6bd4\uff08\u56fe\u6e90\uff1a<a href=\"https:\/\/link.segmentfault.com\/?enc=oyQVPBywiNBHGOg0udGaFw%3D%3D.E7mDvSX6tzU6vfd%2FaOO2U%2BBLvWui2FKuEAw2VqK45PERNFizTR1rKQhMTXkq7ckc\" rel=\"nofollow\">https:\/\/zhuanlan.zhihu.com\/p\/&#8230;<\/a>\uff09\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042204646\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\" ><br \/>2.4 BPF \u6307\u4ee4\u96c6BPF(\u9ed8\u8ba4\u6307 eBPF \u975e cBPF) \u7a0b\u5e8f\u6307\u4ee4\u90fd\u662f 64 \u4f4d\uff0c\u4f7f\u7528\u4e86 11 \u4e2a 64 \u4f4d\u5bc4\u5b58\u5668\uff0c32 \u4f4d\u79f0\u4e3a\u534a\u5bc4\u5b58\u5668\uff08subregister\uff09\u548c\u4e00\u4e2a\u7a0b\u5e8f\u8ba1\u6570\u5668\uff08program counter\uff09\uff0c\u4e00\u4e2a\u5927\u5c0f\u4e3a 512 \u5b57\u8282\u7684 BPF \u6808\u3002\u6240\u6709\u7684 BPF \u6307\u4ee4\u90fd\u6709\u7740\u76f8\u540c\u7684\u7f16\u7801\u65b9\u5f0f\u3002eBPF\u865a\u62df\u6307\u4ee4\u7cfb\u7edf\u5c5e\u4e8e RISC\uff0c\u62e5\u6709 11 \u4e2a\u865a\u62df\u5bc4\u5b58\u5668\u3001r0-r10\uff0c\u5728\u5b9e\u9645\u8fd0\u884c\u65f6\uff0c\u865a\u62df\u673a\u4f1a\u628a\u8fd9 11 \u4e2a\u5bc4\u5b58\u5668\u4e00 \u4e00\u5bf9\u5e94\u4e8e\u786c\u4ef6 CPU \u7684\u7269\u7406\u5bc4\u5b58\u5668\u3002\u4e0b\u56fe\u662f\u65b0\u8001\u6307\u4ee4\u7684\u5bf9\u6bd4\uff1a<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042204647\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\" ><br \/>BPF \u6307\u4ee4\u7684\u6838\u5fc3\u7ed3\u6784\u4f53\u5982\u4e0b\uff0c\u6bcf\u4e00\u6761 eBPF \u6307\u4ee4\u90fd\u4ee5\u4e00\u4e2a bpf_insn \u6765\u8868\u793a\uff0c\u5728 cBPF \u4e2d\u662f\u5176\u4ed6\u7684\u4e00\u4e2a\u7ed3\u6784\u4f53(struct sock_filter )\uff0c\u4e0d\u8fc7\u6700\u7ec8\u90fd\u4f1a\u8f6c\u6362\u6210\u7edf\u4e00\u7684\u683c\u5f0f\uff0c\u8fd9\u91cc\u6211\u4eec\u53ea\u7814\u7a76 eBPF\uff1a<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042204648\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\" ><br \/>\u7531\u7ed3\u6784\u4f53\u4e2d\u7684__u8 code \u53ef\u4ee5\u77e5\u9053\uff0c\u4e00\u6761 BPF \u6307\u4ee4\u662f 8 \u4e2a\u5b57\u8282\u957f\u3002\u8fd9 8 \u4f4d\u7684 code\uff0c\u7b2c 0\u30011\u30012 \u4f4d\u8868\u793a\u7684\u662f\u8be5\u64cd\u4f5c\u6307\u4ee4\u7684\u7c7b\u522b\uff0c\u5171 8 \u79cd\uff1a<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042204649\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\" ><br \/>\u4ece\u6700\u4f4e\u4f4d\u5230\u6700\u9ad8\u4f4d\u5206\u522b\u662f\uff1a8 \u4f4d\u7684 opcode\uff1b\u6709 BPF_X \u7c7b\u578b\u7684\u57fa\u4e8e\u5bc4\u5b58\u5668\u7684\u6307\u4ee4\uff0c\u4e5f\u6709 BPF_K \u7c7b\u578b\u7684\u57fa\u4e8e\u7acb\u5373\u6570\u7684\u6307\u4ee44 \u4f4d\u7684\u76ee\u6807\u5bc4\u5b58\u5668 (dst)4 \u4f4d\u7684\u539f\u59cb\u5bc4\u5b58\u5668 (src)16 \u4f4d\u7684\u504f\u79fb\uff08\u6709\u7b26\u53f7\uff09\uff0c\u662f\u76f8\u5bf9\u4e8e\u6808\u3001\u6620\u5c04\u503c\uff08map values\uff09\u3001\u6570\u636e\u5305\uff08packet data\uff09\u7b49\u7684\u76f8\u5bf9\u504f\u79fb\u91cf32 \u4f4d\u7684\u7acb\u5373\u6570 (imm)\uff08\u6709\u7b26\u53f7\uff09<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042204650\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\" ><br \/>8 bit \u7684 opcode \u8fdb\u4e00\u6b65\u62c6\u5f00\uff0c\u4e0b\u56fe\u8868\u793a\u7684\u662f\u5b58\u50a8\u548c\u52a0\u8f7d\u7c7b\u6307\u4ee4\uff1a<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042204651\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\" ><br \/>\u4e0b\u56fe\u8868\u793a\u7684\u662f\u8fd0\u7b97\u548c\u8df3\u8f6c\u6307\u4ee4\uff1a<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042204652\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\" ><br \/>\u603b\u4e4b\uff0cBPF \u6307\u4ee4\u5f88\u7b80\u6d01\uff0c\u6211\u4eec\u672a\u5fc5\u4f1a\u5728\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u4f7f\u7528\u5b83\u6765\u8fdb\u884c\u4ee3\u7801\u7f16\u5199\uff08\u7c7b\u4f3c\u4e8e\u7eaf\u6c47\u7f16\uff0c\u4f1a\u8ba9\u4eba\u5d29\u6e83\uff09\uff0c\u4e86\u89e3\u8fd9\u4e9b\u662f\u6709\u52a9\u4e8e\u6211\u4eec\u66f4\u6df1\u523b\u7684\u7406\u89e3 BPF \u7684\u8fd0\u884c\u539f\u7406\u30022.5 BPF \u7684 prog type \u548c mapPROG TYPEBPF \u76f8\u5173\u7684\u7a0b\u5e8f\uff0c\u9996\u5148\u9700\u8981\u8bbe\u7f6e\u4e3a\u76f8\u5bf9\u5e94\u7684\u7684\u7a0b\u5e8f\u7c7b\u578b\uff0c\u622a\u6b62 Linux \u5185\u6838 5.8 \u7a0b\u5e8f\u7c7b\u578b\u5b9a\u4e49\u6709 29 \u4e2a\uff0c\u800c\u4e14\u8fd8\u5728\u6301\u7eed\u589e\u52a0\u4e2d\uff0cBPF \u7a0b\u5e8f\u7c7b\u578b\uff08prog_type\uff09\u51b3\u5b9a\u4e86\u7a0b\u5e8f\u53ef\u4ee5\u8c03\u7528\u7684\u5185\u6838\u8f85\u52a9\u51fd\u6570\u7684\u5b50\u96c6\uff0c\u4e5f\u51b3\u5b9a\u4e86\u7a0b\u5e8f\u8f93\u5165\u4e0a\u4e0b\u6587 &#8212; bpf_context \u7ed3\u6784\u7684\u683c\u5f0f\u3002\u6211\u4eec\u7ecf\u5e38\u4f7f\u7528BPF\u7a0b\u5e8f\u7c7b\u578b\u4e3b\u8981\u6d89\u53ca\u4ee5\u4e0b\u4e24\u7c7b\uff1a\u8ddf\u8e2a\u5927\u90e8BPF\u7a0b\u5e8f\u90fd\u662f\u8fd9\u4e00\u7c7b\uff0c\u4e3b\u8981\u901a\u8fc7kprobe\u3001tracepoint\uff08rawtracepoint\uff09\u7b49\u8ffd\u8e2a\u7cfb\u7edf\u884c\u4e3a\u53ca\u83b7\u53d6\u7cfb\u7edf\u786c\u4ef6\u4fe1\u606f\u3002\u4e5f\u53ef\u4ee5\u8bbf\u95ee\u7279\u5b9a\u7a0b\u5e8f\u7684\u5185\u5b58\u533a\u57df\uff0c\u4ece\u8fd0\u884c\u8fdb\u7a0b\u4e2d\u63d0\u53d6\u6267\u884c\u8ddf\u8e2a\u4fe1\u606f\u3002\u7f51\u7edc\u8fd9\u7c7bBPF\u7a0b\u5e8f\u7528\u4e8e\u68c0\u6d4b\u548c\u63a7\u5236\u7cfb\u7edf\u7684\u7f51\u7edc\u6d41\u91cf\u3002\u53ef\u4ee5\u5bf9\u7f51\u7edc\u63a5\u53e3\u6570\u636e\u5305\u8fdb\u884c\u8fc7\u6ee4\uff0c\u751a\u81f3\u53ef\u4ee5\u5b8c\u5168\u62d2\u7edd\u6570\u636e\u5305\u3002\u7528\u6237\u6001\u662f\u901a\u8fc7\u7cfb\u7edf\u8c03\u7528\u6765\u52a0\u8f7dBPF\u7a0b\u5e8f\u5230\u5185\u6838\u7684\uff0c\u5728\u52a0\u8f7d\u7a0b\u5e8f\u65f6\uff0c\u9700\u8981\u4f20\u9012\u7684\u53c2\u6570\u4e2d\u6709\u4e00\u4e2a\u5b57\u6bb5\u53ebprog_type\uff0c\u8fd9\u4e2a\u5c31\u662fBPF\u7684\u7a0b\u5e8f\u7c7b\u578b\uff0c\u8ddf\u8e2a\u76f8\u5173\u7684\u662f\uff1aBPF_PROG_TYPE_KPROBE\u548cBPF_PROG_TYPE_TRACEPOINT\uff0c\u7f51\u7edc\u76f8\u5173\u662f\uff1aBPF_PROG_TYPE_SK_SKB\u3001BPF_PROG_TYPE_SOCK_OPS\u7b49\u3002\u4e0b\u9762\u662f\u63cf\u8ff0BPF\u7a0b\u5e8f\u7c7b\u578b\u7684\u679a\u4e3e\u7ed3\u6784\uff1aenum bpf_prog_type {<br \/>  BPF_PROG_TYPE_UNSPEC,        \/<em> Reserve 0 as invalid program type <\/em>\/<br \/>  BPF_PROG_TYPE_SOCKET_FILTER,<br \/>  BPF_PROG_TYPE_KPROBE,<br \/>  BPF_PROG_TYPE_SCHED_CLS,<br \/>  BPF_PROG_TYPE_SCHED_ACT,<br \/>  BPF_PROG_TYPE_TRACEPOINT,<br \/>  BPF_PROG_TYPE_XDP,<br \/>  BPF_PROG_TYPE_PERF_EVENT,<br \/>  BPF_PROG_TYPE_CGROUP_SKB,<br \/>  BPF_PROG_TYPE_CGROUP_SOCK,<br \/>  BPF_PROG_TYPE_LWT_IN,<br \/>  BPF_PROG_TYPE_LWT_OUT,<br \/>  BPF_PROG_TYPE_LWT_XMIT,<br \/>  BPF_PROG_TYPE_SOCK_OPS,<br \/>  BPF_PROG_TYPE_SK_SKB,<br \/>  BPF_PROG_TYPE_CGROUP_DEVICE,<br \/>  BPF_PROG_TYPE_SK_MSG,<br \/>  BPF_PROG_TYPE_RAW_TRACEPOINT,<br \/>  BPF_PROG_TYPE_CGROUP_SOCK_ADDR,<br \/>  BPF_PROG_TYPE_LWT_SEG6LOCAL,<br \/>  BPF_PROG_TYPE_LIRC_MODE2,<br \/>  BPF_PROG_TYPE_SK_REUSEPORT,<br \/>  BPF_PROG_TYPE_FLOW_DISSECTOR,<br \/>  \/<em> See \/usr\/include\/linux\/bpf.h for the full list. <\/em>\/<br \/>};BPF MAPBPF \u7684 map \u53ef\u7528\u4e8e\u5185\u6838 BPF \u7a0b\u5e8f\u548c\u7528\u6237\u5e94\u7528\u7a0b\u5e8f\u4e4b\u95f4\u5b9e\u73b0\u53cc\u5411\u7684\u6570\u636e\u4ea4\u6362\uff0c \u662f\u91cd\u8981\u57fa\u7840\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u53ef\u4ee5\u901a\u8fc7\u58f0\u660e struct bpf_map_def \u7ed3\u6784\u5b8c\u6210\u521b\u5efa\u3002\u5173\u4e8e BPF \u6700\u5438\u5f15\u4eba\u7684\u4e00\u4e2a\u65b9\u9762\uff0c\u5c31\u662f\u8fd0\u884c\u5728\u5185\u6838\u4e0a\u7684\u7a0b\u5e8f\u53ef\u4ee5\u5728\u8fd0\u884c\u65f6\u4f7f\u7528\u6d88\u606f\u4f20\u9012\u76f8\u4e92\u901a\u4fe1\uff0c\u800c BPF Map \u5c31\u662f\u7528\u6237\u7a7a\u95f4\u548c\u5185\u6838\u7a7a\u95f4\u4e4b\u95f4\u7684\u6570\u636e\u4ea4\u6362\u3001\u4fe1\u606f\u4f20\u9012\u7684\u6865\u6881\u3002BPF Map \u672c\u8d28\u4e0a\u662f\u4ee5\u952e\/\u503c\u65b9\u5f0f\u5b58\u50a8\u5728\u5185\u6838\u4e2d\u7684\u6570\u636e\u7ed3\u6784\u3002\u5728\u5185\u6838\u7a7a\u95f4\u7684\u7a0b\u5e8f\u521b\u5efa BPF Map \u5e76\u8fd4\u56de\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5728\u7528\u6237\u7a7a\u95f4\u8fd0\u884c\u7684\u7a0b\u5e8f\u5c31\u53ef\u4ee5\u901a\u8fc7\u8fd9\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u6765\u8bbf\u95ee\u5e76\u64cd\u4f5c BPF Map\u3002\u6839\u636e\u7533\u8bf7\u5185\u5b58\u65b9\u5f0f\u7684\u4e0d\u540c\uff0cBPF Map \u6709\u5f88\u591a\u79cd\u7c7b\u578b\uff0c\u5e38\u7528\u7684\u7c7b\u578b\u662fBPF_MAP_TYPE_HASH \u548c BPF_MAP_TYPE_ARRAY\uff0c\u5b83\u4eec\u80cc\u540e\u7684\u5185\u5b58\u7ba1\u7406\u65b9\u5f0f\u8ddf\u6211\u4eec\u719f\u6089\u7684\u54c8\u5e0c\u8868\u548c\u6570\u7ec4\u57fa\u672c\u4e00\u81f4\u3002\u968f\u7740\u591a CPU \u67b6\u6784\u7684\u6210\u719f\u53d1\u5c55\uff0cBPF Map \u4e5f\u5f15\u5165\u4e86per-cpu \u7c7b\u578b\uff0c\u5982 BPF_MAP_TYPE_PERCPU_HASH\u3001BPF_MAP_TYPE_PERCPU_ARRAY \u7b49\uff0c\u6bcf\u4e2a CPU \u90fd\u4f1a\u5b58\u50a8\u5e76\u770b\u5230\u5b83\u81ea\u5df1\u7684 Map \u6570\u636e\uff0c\u4ece\u5c5e\u4e8e\u4e0d\u540c CPU \u4e4b\u95f4\u7684\u6570\u636e\u662f\u4e92\u76f8\u9694\u79bb\u7684\u3002\u4e0b\u9762\u662f\u63cf\u8ff0 BPF map \u7684\u679a\u4e3e\u7ed3\u6784\uff1aenum bpf_map_type {<br \/>  BPF_MAP_TYPE_UNSPEC,<br \/>  BPF_MAP_TYPE_HASH,<br \/>  BPF_MAP_TYPE_ARRAY,<br \/>  BPF_MAP_TYPE_PROG_ARRAY,<br \/>  BPF_MAP_TYPE_PERF_EVENT_ARRAY,<br \/>  BPF_MAP_TYPE_PERCPU_HASH,<br \/>  BPF_MAP_TYPE_PERCPU_ARRAY,<br \/>  BPF_MAP_TYPE_STACK_TRACE,<br \/>  BPF_MAP_TYPE_CGROUP_ARRAY,<br \/>  BPF_MAP_TYPE_LRU_HASH,<br \/>  BPF_MAP_TYPE_LRU_PERCPU_HASH,<br \/>  BPF_MAP_TYPE_LPM_TRIE,<br \/>  BPF_MAP_TYPE_ARRAY_OF_MAPS,<br \/>  BPF_MAP_TYPE_HASH_OF_MAPS,<br \/>  BPF_MAP_TYPE_DEVMAP,<br \/>  BPF_MAP_TYPE_SOCKMAP,<br \/>  BPF_MAP_TYPE_CPUMAP,<br \/>  BPF_MAP_TYPE_XSKMAP,<br \/>  BPF_MAP_TYPE_SOCKHASH,<br \/>  BPF_MAP_TYPE_CGROUP_STORAGE,<br \/>  BPF_MAP_TYPE_REUSEPORT_SOCKARRAY,<br \/>  BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE,<br \/>  BPF_MAP_TYPE_QUEUE,<br \/>  BPF_MAP_TYPE_STACK,<br \/>  BPF_MAP_TYPE_SK_STORAGE,<br \/>  BPF_MAP_TYPE_DEVMAP_HASH,<br \/>  BPF_MAP_TYPE_STRUCT_OPS,<br \/>  BPF_MAP_TYPE_RINGBUF,<br \/>  BPF_MAP_TYPE_INODE_STORAGE,<br \/>  BPF_MAP_TYPE_TASK_STORAGE,<br \/>  BPF_MAP_TYPE_BLOOM_FILTER,<br \/>};\u4e09\u3001BPF \u7684\u5f00\u53d1\u59ff\u52bf3.1 BPF \u5f00\u53d1\u6846\u67b6<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042204653\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\" ><br \/>\u4e0a\u56fe\u5c31\u662f\u975e\u5e38\u7ecf\u5178\u7684 BPF \u5f00\u53d1\u6846\u67b6\u56fe\u4e86\uff0c\u4e00\u822c\u5f00\u53d1\u6d41\u7a0b\u90fd\u662f\u5148\u5c06\u7528\u6237\u7f16\u5199\u7684\u7279\u5b9a\u7a0b\u5e8f\u901a\u8fc7 LLVM \u7f16\u8bd1\u4e3a BPF \u5b57\u8282\u7801\uff0c\u5728\u6ce8\u5165\u5230\u5185\u6838\u4e2d\u65f6\u4f1a\u7ecf\u8fc7 verifier \u4e25\u683c\u7684\u68c0\u67e5\uff0c\u786e\u4fdd\u4ee3\u7801\u4e0d\u4f1a\u51fa\u73b0\u6b7b\u5faa\u73af\u3001\u5b95\u673a\u4e4b\u7c7b\u7684\u95ee\u9898\uff0c\u7136\u540e\u518d\u901a\u8fc7jit\u5c06\u5176\u7ffb\u8bd1\u4e3a native code \u8fdb\u884c\u6267\u884c\uff0c\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u67e5\u770b\u5185\u6838\u900f\u51fa\u7684\u6570\u636e\uff0c\u4e86\u89e3\u7cfb\u7edf\u7684\u8fd0\u884c\u60c5\u51b5\u3002\u00a0\u867d\u7136 BPF \u6709\u975e\u5e38\u591a\u7684\u5e94\u7528\uff0c\u4f46\u4f7f\u7528\u7684\u65f6\u5019\u4e5f\u6709\u8bb8\u591a\u7684\u9650\u5236\u3002\u6bd4\u5982\uff1a\u4e0d\u80fd\u6709\u4e0d\u786e\u5b9a\u7684\u5faa\u73af\u64cd\u4f5c\uff1b\u5185\u6838\u8981\u786e\u4fdd\u6267\u884c\u6d41\u4e00\u5b9a\u53ef\u4ee5\u4eceBPF\u7a0b\u5e8f\u4e2d\u51fa\u6765\u3002\u4e0d\u5141\u8bb8\u7761\u7720\uff1b\u7761\u7720\u53ef\u80fd\u5bfc\u81f4\u5185\u6838\u6267\u884c\u6d41\u4e00\u76f4\u51fa\u4e0d\u6765\u3002\u4e0d\u5141\u8bb8\u4fee\u6539\u5185\u6838\u6570\u636e\u7ed3\u6784\uff1b\u4e00\u822c\u4e0d\u80fd\u4fee\u6539\u6570\u636e\u62a5\u6587\u3002\u6808\u7a7a\u95f4\u6709\u9650\uff1b\u5f53\u524d\u53ea\u6709 512 \u5b57\u8282\u3002\u4e0d\u5141\u8bb8\u88ab\u76f4\u63a5\u8c03\u7528\u5185\u6838\u51fd\u6570\uff1b\u5fc5\u987b\u901a\u8fc7\u8f85\u52a9\u51fd\u6570\u30023.2 \u5f00\u6e90\u5de5\u5177\u548c\u5e73\u53f0BPF\u7684\u7f16\u7a0b\u5206\u4e3a\u4e24\u90e8\u5206\uff0c\u4e00\u90e8\u5206\u662f\u8fd0\u884c\u5728\u5185\u6838\u6001\uff0c\u8fd9\u662f BPF \u7f16\u7a0b\u7684\u6838\u5fc3\uff1b\u53e6\u4e00\u90e8\u5206\u662f\u8fd0\u884c\u5728\u7528\u6237\u6001\uff0c\u8fd9\u90e8\u5206\u4ee3\u7801\u4e3b\u8981\u7528\u6765\u52a0\u8f7dBPF\uff0c\u91c7\u96c6\u5e76\u5904\u7406\u6570\u636e\u7b49\u3002libbpflibbpf\u662f\u5b98\u65b9\u7684\u7528\u6237\u6001\u5e93\u3002\u548c\u7f16\u8bd1\u666e\u901a\u7684c\u7a0b\u5e8f\u4f1a\u5f97\u5230\u4e00\u4e2a.o\u6587\u4ef6\u4e00\u6837\uff0cLLVM\u7f16\u8bd1\u5b8cBPF \u7a0b\u5e8f\u4e5f\u4f1a\u5f97\u5230\u4e00\u4e2a\u7684.o\u6587\u4ef6(\u4e00\u822c\u6211\u4eec\u547d\u540d\u4e3axx.bpf.o)\u3002\u8fd9\u4e2a bpf.o \u6587\u4ef6\u6309\u7167 elf \u7684\u683c\u5f0f\u7ec4\u7ec7 BPF \u7a0b\u5e8f\u7684\u5b57\u8282\u7801\u3001map\u5b9a\u4e49\u4ee5\u53ca\u7b26\u53f7\u7b49\u4fe1\u606f\uff0clibbpf \u5e93\u8d1f\u8d23\u89e3\u6790\u8fd9\u4e9b\u4fe1\u606f\uff0c\u521b\u5efa map\uff0c\u6ce8\u5165 BPF \u7a0b\u5e8f\u5230\u5185\u6838\u5de5\u4f5c\u3002\u56e0\u6b64\uff0c\u5bf9\u4e8e\u7528\u6237\u6765\u8bf4\uff0c\u9700\u8981\u505a\u5f88\u591a\u7e41\u7410\u7684\u5de5\u4f5c\uff1a\u7528 C \u8bed\u8a00\u6765\u7f16\u5199 BPF \u7a0b\u5e8f\uff1b\u7f16\u5199 makefile\uff0c\u8c03\u7528 LLVM \u7f16\u8bd1\u751f\u6210 .o \u6587\u4ef6\uff1b\u8c03\u7528 libbpf \u7684\u63a5\u53e3\u52a0\u8f7d .o \u6587\u4ef6\uff1b\u4f7f\u7528 libbpf \u7684\u63a5\u53e3\u83b7\u53d6 map \u4e2d\u7684\u6570\u636e\u3002BCCBCC \u662f\u5982\u4eca\u6700\u70ed\u95e8\u4e5f\u662f\u5bf9\u65b0\u624b\u6700\u53cb\u597d\u7684\u5f00\u6e90\u5e73\u53f0\u3002\u5b83\u7528 python \u5c01\u88c5\u4e86\u7f16\u8bd1\u3001\u52a0\u8f7d\u548c\u8bfb\u53d6\u6570\u636e\u7684\u8fc7\u7a0b\uff0c\u63d0\u4f9b\u4e86\u5f88\u591a\u975e\u5e38\u597d\u7528\u7684 API\u3002\u548c libbpf \u9700\u8981\u63d0\u524d\u628a bpf \u7a0b\u5e8f\u7f16\u8bd1\u6210 bpf.o \u4e0d\u540c\uff0cBCC \u662f\u5728\u8fd0\u884c\u65f6\u624d\u8c03\u7528 LLVM \u8fdb\u884c\u7f16\u8bd1\u7684\uff0c\u6240\u4ee5\u8981\u6c42\u7528\u6237\u73af\u5883\u4e0a\u6709 llvm \u548c kernel-devel\u3002\u8fd9\u4e2a\u5c31\u4f1a\u50cf\u540e\u9762\u6211\u4eec\u63d0\u5230\u7684\uff0c\u5b83\u4f1a\u51fa\u73b0\u8fd0\u884c\u65f6\u504f\u79fb\u5bfc\u81f4\u7684\u77ac\u65f6\u8d44\u6e90\u51b2\u9ad8\u95ee\u9898\u3002bpftracebpftrace \u662f\u5355\u547d\u4ee4\u5de5\u5177\uff0c\u8ba9\u7528\u6237\u50cf\u4f7f\u7528\u811a\u672c\u4e00\u6837\u4f7f\u7528 BPF\u3002\u5b83\u81ea\u5b9a\u4e49\u4e86\u81ea\u5df1\u7684 DSL \u4f5c\u4e3a\u524d\u7aef\uff0c\u5e95\u5c42\u4e5f\u662f\u8c03\u7528 LLVM \u7684\u3002\u4e8b\u5b9e\u4e0a\uff0c\u5b83\u4f9d\u8d56\u4e8e BCC \u63d0\u4f9b\u7684 libbcc.so \u6587\u4ef6\u30023.3 libbpf CORE\u524d\u9762\u63d0\u5230 libbpf \u5f00\u53d1\uff0c\u6210\u4e3a\u5f53\u524d\u6700\u4e3b\u6d41\u7684\u5f00\u53d1\u65b9\u5f0f\uff0c\u4f46\u662f\u9700\u8981\u4e3a\u6bcf\u4e2a\u5185\u6838\u7248\u672c\u90fd\u5f00\u53d1\u7279\u5b9a\u7684\u4e8c\u8fdb\u5236\u7a0b\u5e8f\uff0c\u4e0d\u80fd\u8fbe\u5230\u540c\u4e00\u4e2a BPF \u7a0b\u5e8f\u5728\u4e0d\u540c\u5185\u6838\u7248\u672c\u4e0a\u5b89\u5168\u8fd0\u884c\u3002\u7531\u4e8e\u4e0d\u540c\u5185\u6838\u7248\u672c\u6570\u636e\u7684\u5185\u5b58\u5e03\u5c40\u4e0d\u540c\uff0c\u5c31\u9700\u8981\u652f\u6301CORE\uff08CompileOnce\u3001Runeverywhere\uff09\uff0c\u63d0\u5230 CORE \u6211\u4eec\u8981\u5148\u6765\u4e86\u89e3\u4e00\u4e0b BTF\u3002BTF\uff08BPF Type Format\uff09\u662f\u4e00\u79cd\u7c7b\u4f3c\u4e8e DWARF \u7684\u683c\u5f0f\uff0c\u4e13\u7528\u4e8e\u63cf\u8ff0\u7a0b\u5e8f\u4e2d\u6570\u636e\u7c7b\u578b\u3002\u5176\u4e3b\u8981\u5b58\u5728\u4e8e\u4e24\u4e2a\u5730\u65b9\uff1a\u4e00\u662f vmlinux \u955c\u50cf\u5185\u3002\u4e8c\u662f\u7528\u6237\u7f16\u5199\u7684 BPF \u7a0b\u5e8f\u5185\u3002\u4e8c\u8005\u5b58\u5728\u7740\u4e00\u5b9a\u7684\u5dee\u5f02\u3002\u7b2c\u4e00\u4e2a\u5dee\u5f02\u662f\uff1aBPF \u7a0b\u5e8f\u5185\u9664\u4e86\u5b58\u5728 .btf \u6bb5\u5916\uff0c\u8fd8\u5b58\u5728.btf.ext \u6bb5\uff0c\u4e13\u7528\u4e8e\u8bb0\u5f55 BPF \u7a0b\u5e8f\u5185\u4f7f\u7528\u7684\u6570\u636e\u7c7b\u578b\u7684\u60c5\u51b5\u3002\u7b2c\u4e8c\u4e2a\u5dee\u5f02\u662f\uff1avmlinux \u955c\u50cf\u5185\u7684 BTF \u7a0b\u5e8f\u7531\u539f\u5b58\u5728\u4e8e\u8be5\u955c\u50cf\u5185\u7684 dwarf \u4fe1\u606f\u7b80\u5316\u800c\u6765\uff0c\u800c BPF \u7a0b\u5e8f\u5185\u7684 BTF \u6bb5\u7531 CLANG \u7f16\u8bd1\u5668\u751f\u6210\uff0c\u9700\u8981\u5728\u7f16\u8bd1\u65f6\u6307\u5b9a &#8211;target bpf\u3002\u5229\u7528 BPF \u7a0b\u5e8f\u91cc\u7684 BTF \u6bb5\u548c\u5b58\u653e\u5728\u6bcf\u4e2a\u7cfb\u7edf\u4e0a\u7684 BTF \u6587\u4ef6\uff0c\u6211\u4eec\u5c06\u8fd9\u4e9b\u4fe1\u606f\u8fdb\u884c\u91cd\u5b9a\u4f4d\uff0c\u5c31\u80fd\u786e\u5b9a\u6bcf\u4e2a\u6570\u636e\u7ed3\u6784\u7684\u504f\u79fb\uff0c\u8fbe\u5230 CORE \u7684\u76ee\u7684\u3002\u5173\u952e\u7ec4\u4ef6\uff1aBTF: \u63cf\u8ff0\u5185\u6838\u955c\u50cf\uff0c\u83b7\u53d6\u5185\u6838\u53caBPF\u7a0b\u5e8f\u7c7b\u578b\u548c\u4ee3\u7801\u7684\u5173\u952e\u4fe1\u606f(<a href=\"https:\/\/link.segmentfault.com\/?enc=KYdjM9TgxQSxi1l9p9M4Cg%3D%3D.OgtfmuwEyGtRYHr1RmjqHOkvZFMCS1i%2BXVKevZJ0cm8%3D\" rel=\"nofollow\">http:\/\/pylcc.openanolis.cn\/<\/a>)Clang \u91ca\u653e bpf \u7a0b\u5e8f\u91cd\u5b9a\u4f4d\u4fe1\u606f\u5230 .btf \u6bb5Libbpf CO-RE \u6839\u636e .btf \u6bb5\u91cd\u5b9a\u4f4d bpf \u7a0b\u5e8f\u76ee\u524d\u5728 libbpf CO-RE \u4e2d\u9700\u8981\u8fdb\u884c\u91cd\u5b9a\u4f4d\u7684\u4fe1\u606f\u4e3b\u8981\u6709\u4e09\u7c7b\uff1a1\uff09\u7ed3\u6784\u4f53\u76f8\u5173\u91cd\u5b9a\u4f4d\uff0c\u8fd9\u90e8\u5206\u548c BTF \u606f\u606f\u76f8\u5173\uff1bClang \u901a\u8fc7 __builtin_preserve_access_index() \u8bb0\u5f55\u6210\u5458\u504f\u79fb\u91cfu64 inode = task-&gt;mm-&gt;exe_file-&gt;f_inode-&gt;i_ino;<br \/>u64 inode = BPF_CORE_READ(task, mm, exe_file, f_inode, i_ino);2\uff09map fd\u3001\u5168\u5c40\u53d8\u91cf\u3001extern \u7b49\u91cd\u5b9a\u4f4d\uff0c\u8fd9\u90e8\u5206\u4e3b\u8981\u4f9d\u8d56\u4e8e ELF \u91cd\u5b9a\u4f4d\u673a\u5236\u3002\u901a\u8fc7\u67e5\u627e ELF \u91cd\u5b9a\u4f4d\u6bb5\u6536\u96c6\u91cd\u5b9a\u4f4d\u4fe1\u606f\uff0c\u66f4\u65b0\u76f8\u5e94\u6307\u4ee4\u7684 imm \u5b57\u6bb5\u3002skel-&gt;rodata-&gt;my_cfg.feature_enabled = true;<br \/>skel-&gt;rodata-&gt;my_cfg.pid_to_filter = 123;<br \/>extern u32 LINUX_KERNEL_VERSION   __kconfig;<br \/>extern u32 CONFIG_HZ              __kconfig;3\uff09\u5b50\u51fd\u6570\u91cd\u5b9a\u4f4d\uff0c\u4e5f\u662f\u4f9d\u8d56\u4e8e ELF \u91cd\u5b9a\u4f4d\u673a\u5236\u3002\u4f46\u662f\u76ee\u7684\u4e0d\u4e00\u6837\uff0c\u5b50\u51fd\u6570\u91cd\u5b9a\u4f4d\u662f\u4e3a\u4e86\u5c06 eBPF \u7a0b\u5e8f\u8c03\u7528\u7684\u5b50\u51fd\u6570\u540c\u4e3b\u51fd\u6570\u653e\u5728\u540c\u4e00\u5757\u8fde\u7eed\u7684\u5185\u5b58\u4e2d\uff0c\u4fbf\u4e8e\u4e00\u8d77\u52a0\u8f7d\u5230\u5185\u6838\u3002\u4f8b\u5982\u5c06\u6240\u6709\u5b50\u7a0b\u5e8f\u62f7\u8d1d\u5230\u4e3b\u7a0b\u5e8f\u6240\u5728\u533a\u57df\uff0c always_inline \u51fd\u6570\u3002libbpf CORE \u5f00\u53d1\u6b65\u9aa4\uff1a1\uff09\u751f\u6210\u5e26\u6240\u6709\u5185\u6838\u7c7b\u578b\u7684\u5934\u6587\u4ef6 vmlinux.hbpftoolbtf dump file vmlinux format c &gt; vmlinux.h2\uff09\u4f7f\u7528 Clang (\u7248\u672c 10 \u6216\u66f4\u65b0\u7248\u672c)\u5c06BPF\u7a0b\u5e8f\u7684\u6e90\u4ee3\u7801\u7f16\u8bd1\u4e3a .o \u5bf9\u8c61\u6587\u4ef6\uff1b3\uff09\u4ece\u7f16\u8bd1\u597d\u7684 BPF \u5bf9\u8c61\u6587\u4ef6\u4e2d\u751f\u6210BPF skeleton \u5934\u6587\u4ef6 bpftool gen \u547d\u4ee4\u751f\u6210\uff1b4\uff09\u5728\u7528\u6237\u7a7a\u95f4\u4ee3\u7801\u4e2d\u5305\u542b\u751f\u6210\u7684 BPF skeleton \u5934\u6587\u4ef6\uff1b5\uff09\u7f16\u8bd1\u7528\u6237\u7a7a\u95f4\u4ee3\u7801\uff0c\u8fd9\u6837\u4f1a\u5d4c\u5165 BPF \u5bf9\u8c61\u4ee3\u7801\uff0c\u540e\u7eed\u5c31\u4e0d\u7528\u53d1\u5e03\u5355\u72ec\u7684\u6587\u4ef6\u30026\uff09\u751f\u6210\u7684 BPF skeleton \u4f7f\u7528\u5982\u4e0b\u6b65\u9aa4\u52a0\u8f7d\u3001\u7ed1\u5b9a\u3001\u9500\u6bc1\uff1a&lt;name&gt;__open() \u2013 \u521b\u5efa\u5e76\u6253\u5f00 BPF \u5e94\u7528\uff0c\u4e4b\u540e\u53ef\u4ee5\u8bbe\u7f6e skel-&gt;rodata \u53d8\u91cf\u3002&lt;name&gt;__load() \u2013 \u521d\u59cb\u5316\uff0c\u52a0\u8f7d\u548c\u6821\u9a8cBPF \u5e94\u7528\u90e8\u5206\u3002&lt;name&gt;__attach() \u2013 \u9644\u52a0\u6240\u6709\u53ef\u4ee5\u81ea\u52a8\u9644\u52a0\u7684BPF\u7a0b\u5e8f (\u53ef\u9009\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 libbpf API \u4f5c\u66f4\u591a\u63a7\u5236)\u3002&lt;name&gt;__destroy() \u2013 \u5206\u79bb\u6240\u6709\u7684 BPF \u7a0b\u5e8f\u5e76\u4f7f\u7528\u5176\u4f7f\u7528\u7684\u6240\u6709\u8d44\u6e90\u3002\u56db\u3001 coolbpf \u4eab\u53d7\u5f0f\u5f00\u53d1\u524d\u9762\u6211\u4eec\u5df2\u7ecf\u5bf9 BPF \u6709\u4e86\u4e00\u4e2a\u8ba4\u8bc6\uff0c\u5230\u6b64\u5df2\u7ecf\u5165\u95e8\u4e86\uff0c\u540c\u65f6\u4e5f\u5b66\u4e60\u4e86 BPF \u7684\u9ad8\u9636\u77e5\u8bc6\uff1alibbpf \u7684 CORE\uff0c\u5b83\u4e5f\u662f\u672a\u6765\u7684\u4e00\u4e2a\u65b9\u5411\uff0c\u4f46\u662f\u6211\u4eec\u4e5f\u770b\u5230\u8fd9\u91cc\u9762\uff0c\u8fd8\u9700\u8981\u5199\u4e00\u5806\u4ee3\u7801\uff1aopen\u3001load\u3001attach \u7b49\u7b49\u3002\u6211\u4eec\u80fd\u5426\u628a\u8fd9\u4e00\u5207\u8fdb\u884c\u7b80\u5316\u5462\uff1f\u80fd\u4e0d\u80fd\u4eab\u53d7\u5f0f\u7684\u8fdb\u884c\u5f00\u53d1\u3002\u522b\u6025\uff0c\u5148\u6765\u770b\u770b\u5e38\u7528\u7684\u5f00\u53d1\u65b9\u5f0f\uff1a4.1 BPF \u5f00\u53d1\u5e38\u7528\u65b9\u6848\u5bf9\u6bd41\uff09\u539f\u751f libbpf\uff0c\u65e0 CO-RE (\u5185\u6838 samples\/bpf \u793a\u4f8b)\u4f18\u52bf\uff1a\u8d44\u6e90\u5360\u7528\u91cf\u4f4e\u7f3a\u70b9\uff1a\u9700\u8981\u642d\u5efa\u4ee3\u7801\u5de5\u7a0b\u3001\u5f00\u53d1\u6548\u7387\u4f4e\uff1b\u4e0d\u540c\u5185\u6838\u7248\u672c\u517c\u5bb9\u6027\u5dee\uff1b2\uff09BCC\uff08BPF Compile Collection\u3001python \u4ee3\u7801\uff09\u4f18\u52bf\uff1a\u5f00\u53d1\u6548\u7387\u9ad8\uff0c\u53ef\u79fb\u690d\u6027\u597d\uff0c\u652f\u6301\u52a8\u6001\u4fee\u6539\u5185\u6838\u90e8\u5206\u4ee3\u7801\u7f3a\u70b9\uff1a\u90e8\u7f72\u4f9d\u8d56\u7684 Clang\/LLVM\uff1b\u6bcf\u6b21\u8fd0\u884c\u90fd\u8981\u6267\u884c Clang\/LLVM \u7f16\u8bd1\uff0c\u4e89\u62a2\u5185\u5b58 CPU \u5185\u5b58\u7b49\u8d44\u6e90\uff1b\u4f9d\u8d56\u76ee\u6807\u73af\u5883\u5934\u6587\u4ef6\uff1b3\uff09BPF CO-RE\uff08libbpf-tools \u4e0b\u9762\u7684\u4ee3\u7801\uff09\u4f18\u52bf\uff1a\u4e0d\u4f9d\u8d56\u5728\u73af\u5883\u4e2d\u90e8\u7f72 Clang\/LLVM\uff0c\u8d44\u6e90\u5360\u7528\u5c11\u7f3a\u70b9\uff1a\u4ecd\u9700\u8981\u642d\u5efa\u7f16\u8bd1\u7f16\u8bd1\u5de5\u7a0b\uff1b\u90e8\u5206\u4ee3\u7801\u76f8\u5bf9\u56fa\u5b9a\uff0c\u65e0\u6cd5\u52a8\u6001\u914d\u7f6e\uff1b\u7528\u6237\u6001\u5f00\u53d1\u652f\u6301\u4fe1\u606f\u8f83\u5c11\uff0c\u7f3a\u4e4f\u9ad8\u7ea7\u8bed\u8a00\u5bf9\u63a5\uff1b\u7efc\u4e0a\u6240\u8ff0\uff0c\u4e0a\u8ff0\u65b9\u6848\u4e0d\u80fd\u5f88\u597d\u9002\u914d\u751f\u4ea7\u73af\u5883\u4e2d\uff0c\u591a\u5185\u6838\u5e76\u5b58\u3001\u5feb\u901f\u6279\u91cf\u90e8\u7f72\u7b49\u9700\u6c424.2 Coolbpf\uff08\u53ef\u4ee5\u9177\u73a9\u7684 BPF\uff09\u89e3\u51b3\u7684\u95ee\u9898\u901a\u8fc7\u5c06 BPF \u7684\u4e09\u79cd\u5f00\u53d1\u65b9\u5f0f\u5bf9\u6bd4\uff0c\u6211\u4eec\u53d1\u73b0\u90fd\u4e0d\u80fd\u5b8c\u7f8e\u7684\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u89e3\u51b3\u5982\u4e0b\u51e0\u4e2a\u95ee\u9898\uff1a\u5b89\u88c5\u4f9d\u8d56\u5e93\u548c\u5185\u6838\u5934\u6587\u4ef6\uff1bCPU \u548c\u5185\u5b58\u7b49\u8d44\u6e90\u77ac\u65f6\u51b2\u9ad8\uff1bBTF \u9700\u8981\u6309\u7248\u672c\u968f BPF \u4e8c\u8fdb\u5236\u7a0b\u5e8f\u53d1\u5e03\u3002\u4e3a\u89e3\u51b3\u8fd9\u51e0\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u63d0\u51fa\u4e00\u4e2a coolbpf \u7684\u5f00\u53d1\u7f16\u8bd1\u5e73\u53f0\uff0c\u76ee\u524d\u5305\u542b pylcc\u3001rlcc\u3001golcc \u7b49\u76ee\u5f55\uff0c\u5206\u522b\u662f\u9ad8\u7ea7\u8bed\u8a00 python\u3001rust \u548c go \u8bed\u8a00\u652f\u6301\u8fdc\u7a0b\u548c\u672c\u5730\u7f16\u8bd1\u7684\u80fd\u529b\u3002\u4ee3\u7801\u94fe\u63a5\u5730\u5740\uff1a<a href=\"https:\/\/link.segmentfault.com\/?enc=LD7xSDgeek5As4nX0zN%2BxQ%3D%3D.p7Yn4QwhTh3uLRJpsqLt7Tx8fmD5dIJsaCMUzPL3qb81cOeWreatYgs7gBjWXwjvJD3jSddLv2vxMPtGlhKa%2B2Jk6t0Ks9RsfJz4BtRUG44%3D\" rel=\"nofollow\">https:\/\/gitee.com\/anolis\/cool&#8230;<\/a>\u8fd9\u91cc\u4e0d\u5bf9 coolbpf \u8fc7\u591a\u4ecb\u7ecd\uff0c\u5177\u4f53\u5185\u5bb9\u8bf7\u53c2\u8003\u300a\u9f99\u8725\u793e\u533a\u5f00\u6e90 coolbpf\uff0cBPF \u7a0b\u5e8f\u5f00\u53d1\u6548\u7387\u63d0\u5347\u767e\u500d\u300b\u30024.3 pyLCC \u7684\u4eab\u53d7\u5f0f\u4e3a\u4e86\u4ecb\u7ecd\u4ec0\u4e48\u53eb\u4eab\u53d7\u5f0f\u5f00\u53d1\uff0c\u5728\u8fd9\u91cc\u6211\u4eec\u62ff coolbpf \u7684 pyLCC \u8fdb\u884c\u6f14\u793a\uff1aimport sys<br \/>from pylcc.lbcBase import ClbcBase, CexecCmd  \/\/import pylcc base\u5e93<br \/>bpfProg = r&#8221;&#8221;&#8221;<br \/>struct data_t {<\/p>\n<pre><code>int cpu;\nint type;   \/\/ 0: irq, 1:sirq\nu32 stack_id;\nu64 delayed;<\/code><\/pre>\n<p>};<br \/>LBC_PERF_OUTPUT(e_out, struct data_t, 128); \/\/\u5b9a\u4e49perf event output array map<br \/>LBC_STACK(call_stack, 256);  \/\/\u5b9a\u4e49stack \u7684map<br \/>SEC(&#8220;kprobe\/check_timer_delay&#8221;)<br \/>int j_check_timer_delay(struct pt_regs *ctx)<br \/>{<\/p>\n<pre><code>struct data_t data = {};\n\ndata.cpu = PT_REGS_PARM2(ctx);\ndata.type = PT_REGS_PARM1(ctx);\ndata.delayed = PT_REGS_PARM3(ctx);\ndata.stack_id = bpf_get_stackid(ctx, &amp;call_stack, KERN_STACKID_FLAGS);\n\nbpf_perf_event_output(ctx, &amp;e_out, BPF_F_CURRENT_CPU, &amp;data, sizeof(data));\nreturn 0;<\/code><\/pre>\n<p>}<br \/>&#8220;&#8221;&#8221;<br \/>class Crunlatency(ClbcBase):<\/p>\n<pre><code>def __init__(self, lat=10):\n    self._exec = CexecCmd\n    self.setupKo(lat &gt;&gt; 1)\n\/\/\u53ea\u9700\u8981\u7b80\u5355\u7684init\uff0c\u5c31\u53ef\u4ee5\u628aopen load attach \u7b49\u52a8\u4f5c\u505a\u597d\uff0c\u7136\u540e\u4e13\u6ce8\u4e8e\u6570\u636e\u5904\u7406\n    super(Crunlatency, self).__init__(&quot;runlatency&quot;, bpf_str=bpfProg)\ndef _cb(self, cpu, data, size):\n    stacks = self.maps['call_stack'].getStacks(e.stack_id)\n    print(&quot;call trace:&quot;)   \/\/call back\u51fd\u6570\u91cc\u4e13\u5fc3\u5904\u7406\u6570\u636e\n    for s in stacks:\n        print(s)\u5927\u5bb6\u770b\u5230\u4e0a\u9762\u7684\u793a\u4f8b\uff0c\u53ea\u9700\u8981\u4ee5\u4e0b\u4e09\u6b65\uff0c\u5c31\u53ef\u4ee5\u5b8c\u6210\u4e00\u4e2a\u7a0b\u5e8f\u7684\u5f00\u53d1\uff1a1\uff09pip install coolbpf\u30022\uff09\u7f16\u5199 bpf.c \u4ee3\u7801\u30023\uff09\u7f16\u5199 python\uff0c\u901a\u8fc7 init() \u52a0\u8f7d\u4e4b\u540e\uff0c\u5c31\u4e13\u6ce8\u529f\u80fd\u5f00\u53d1\u3002\u00a0\u4f60\u53ef\u4ee5\u4e0d\u7528\u5173\u5fc3 BPF \u7684\u6c47\u7f16\u3001\u5b57\u8282\u7801\uff0c\u4e5f\u4e0d\u7528\u5b89\u88c5 Clang\uff0c\u4e0d\u7528\u5b89\u88c5 kernel-dev \u5934\u6587\u4ef6\uff0c\u4e0d\u7528\u81ea\u5df1\u751f\u6210 BTF \u6587\u4ef6\uff08\u5b83\u4f1a\u81ea\u52a8\u5230\u8fdc\u7a0b\u670d\u52a1\u5668\u4e0b\u8f7d\uff09\uff0c\u53ea\u9700\u4e13\u6ce8\u4f60\u7684\u529f\u80fd\u5f00\u53d1\uff0c\u6bd4\u5982\u5206\u6790\u7f51\u7edc\u6d41\u91cf\u3001\u76d1\u63a7\u6587\u4ef6\u6253\u5f00\u548c\u5173\u95ed\u3001\u8ddf\u8e2a\u7cfb\u7edf\u8c03\u7528\u3002\u00a0\u603b\u7ed3\u6765\u770b\uff0cBPF \u6280\u672f\u8fd8\u5728\u5982\u706b\u5982\u837c\u7684\u53d1\u5c55\u7740\uff0c\u4f46\u53ea\u8981\u638c\u63e1\u4e86\u8fd9\u4e9b\u57fa\u7840\u7684\u77e5\u8bc6\u70b9\uff0c\u5c31\u80fd\u591f\u89e6\u7c7b\u65c1\u901a\uff0c\u5229\u7528\u597d\u5df2\u6709\u7684\u5de5\u5177\u6216\u5e73\u53f0\uff0c\u66f4\u52a0\u80fd\u5982\u864e\u6dfb\u7ffc\u3002\u901a\u8fc7\u524d\u9762\u7684\u4ecb\u7ecd\uff0c\u6211\u4eec\u4e0d\u4ec5\u5bf9 BPF \u6709\u4e86\u6bd4\u8f83\u6df1\u523b\u7684\u7406\u89e3\uff0c\u8fd8\u80fd\u501f\u52a9 coolbpf\uff0c\u975e\u5e38\u9177\u7684\u73a9\u4e86\u4e00\u628a\u4eab\u53d7\u5f0f\u7684\u5f00\u53d1\uff0c\u7b80\u6d01\u5982\u6b64\uff0c\u8c01\u80fd\u4e0d\u7231\u5462\uff1f\u00a0\u5173\u4e8e\u56de\u653e\u548c\u8bfe\u4ef6\u83b7\u53d6\u3010\u89c6\u9891\u56de\u653e\u3011\uff1a\u89c6\u9891\u56de\u8bbf\u5df2\u4e0a\u4f20\u81f3\u9f99\u8725\u5b98\u7f51\uff08\u53ef\u9605\u8bfb\u539f\u6587\u76f4\u8fbe\uff09\uff1ahttps:\/\/openanolis.cn\/video\u00a0\u67e5\u770b\u3002 \u3010PPT\u8bfe\u4ef6\u83b7\u53d6\u3011\uff1a\u5173\u6ce8\u5fae\u4fe1\u516c\u4f17\u53f7\uff08OpenAnolis\uff09\uff0c\u56de\u590d\u201c\u9f99\u8725\u8bfe\u4ef6\u201d\u00a0\u5373\u53ef\u83b7\u53d6\u3002\u6709\u4efb\u4f55\u7591\u95ee\u8bf7\u968f\u65f6\u54a8\u8be2\u9f99\u8725\u52a9\u624b\u2014\u5c0f\u9f99\uff08\u5fae\u4fe1\uff1aopenanolis_assis)\u3002\u00a0\u2014\u2014 \u5b8c \u2014\u2014\u52a0\u5165\u9f99\u8725\u793e\u7fa4\u52a0\u5165\u5fae\u4fe1\u7fa4\uff1a\u6dfb\u52a0\u793e\u533a\u52a9\u7406-\u9f99\u8725\u793e\u533a\u5c0f\u9f99\uff08\u5fae\u4fe1\uff1aopenanolis_assis\uff09\uff0c\u5907\u6ce8\u3010\u9f99\u8725\u3011\u4e0e\u4f60\u540c\u5728\uff1b\u52a0\u5165\u9489\u9489\u7fa4\uff1a\u626b\u63cf\u4e0b\u65b9\u9489\u9489\u7fa4\u4e8c\u7ef4\u7801\u3002\u6b22\u8fce\u5f00\u53d1\u8005\/\u7528\u6237\u52a0\u5165\u9f99\u8725\u793e\u533a\uff08OpenAnolis\uff09\u4ea4\u6d41\uff0c\u5171\u540c\u63a8\u8fdb\u9f99\u8725\u793e\u533a\u7684\u53d1\u5c55\uff0c\u4e00\u8d77\u6253\u9020\u4e00\u4e2a\u6d3b\u8dc3\u7684\u3001\u5065\u5eb7\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edf\u751f\u6001\uff01<\/code><\/pre>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042204654\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\" ><br \/>\u5173\u4e8e\u9f99\u8725\u793e\u533a\u9f99\u8725\u793e\u533a\uff08OpenAnolis\uff09\u7531\u4f01\u4e8b\u4e1a\u5355\u4f4d\u3001\u9ad8\u7b49\u9662\u6821\u3001\u79d1\u7814\u5355\u4f4d\u3001\u975e\u8425\u5229\u6027\u7ec4\u7ec7\u3001\u4e2a\u4eba\u7b49\u5728\u81ea\u613f\u3001\u5e73\u7b49\u3001\u5f00\u6e90\u3001\u534f\u4f5c\u7684\u57fa\u7840\u4e0a\u7ec4\u6210\u7684\u975e\u76c8\u5229\u6027\u5f00\u6e90\u793e\u533a\u3002\u9f99\u8725\u793e\u533a\u6210\u7acb\u4e8e 2020 \u5e74 9 \u6708\uff0c\u65e8\u5728\u6784\u5efa\u4e00\u4e2a\u5f00\u6e90\u3001\u4e2d\u7acb\u3001\u5f00\u653e\u7684Linux \u4e0a\u6e38\u53d1\u884c\u7248\u793e\u533a\u53ca\u521b\u65b0\u5e73\u53f0\u3002\u9f99\u8725\u793e\u533a\u6210\u7acb\u7684\u77ed\u671f\u76ee\u6807\u662f\u5f00\u53d1\u9f99\u8725\u64cd\u4f5c\u7cfb\u7edf(Anolis OS)\u4f5c\u4e3a CentOS \u505c\u670d\u540e\u7684\u5e94\u5bf9\u65b9\u6848\uff0c\u6784\u5efa\u4e00\u4e2a\u517c\u5bb9\u56fd\u9645 Linux \u4e3b\u6d41\u5382\u5546\u7684\u793e\u533a\u53d1\u884c\u7248\u3002\u4e2d\u957f\u671f\u76ee\u6807\u662f\u63a2\u7d22\u6253\u9020\u4e00\u4e2a\u9762\u5411\u672a\u6765\u7684\u64cd\u4f5c\u7cfb\u7edf\uff0c\u5efa\u7acb\u7edf\u4e00\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edf\u751f\u6001\uff0c\u5b75\u5316\u521b\u65b0\u5f00\u6e90\u9879\u76ee\uff0c\u7e41\u8363\u5f00\u6e90\u751f\u6001\u3002\u76ee\u524d\uff0cAnolis OS 8.6\u00a0\u5df2\u53d1\u5e03\uff0c\u66f4\u591a\u9f99\u8725\u81ea\u7814\u7279\u6027\uff0c\u652f\u6301 X86_64 \u3001RISC-V\u3001Arm64\u3001LoongArch \u67b6\u6784\uff0c\u5b8c\u5584\u9002\u914d Intel\u3001\u5146\u82af\u3001\u9cb2\u9e4f\u3001\u9f99\u82af\u7b49\u82af\u7247\uff0c\u5e76\u63d0\u4f9b\u5168\u6808\u56fd\u5bc6\u652f\u6301\u3002\u6b22\u8fce\u4e0b\u8f7d\uff1a<a href=\"https:\/\/link.segmentfault.com\/?enc=oeOzBOh0jJUjfyFfwCiPLA%3D%3D.kSvMAgpDpcOqQ24TMNllhsCREU9daHZUReJsK1XSavc%3D\" rel=\"nofollow\">https:\/\/openanolis.cn\/download<\/a>\u52a0\u5165\u6211\u4eec\uff0c\u4e00\u8d77\u6253\u9020\u9762\u5411\u672a\u6765\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edf\uff01<a href=\"https:\/\/link.segmentfault.com\/?enc=KdJ8KxTCDpzNAiUaCXZ0pg%3D%3D.yaY30mAh01Xtxq5l63we83F2gbV6S7kRmwV4jgB09zs%3D\" rel=\"nofollow\">https:\/\/openanolis.cn<\/a>\u539f\u6587\u94fe\u63a5\uff1a<a href=\"https:\/\/link.segmentfault.com\/?enc=%2F0PMI8S3qn%2FYMN45d5xKBA%3D%3D.vQLfOJcGOSZlrIYcy5cZ5jYSW3fm%2BtotRO8%2BsPE76%2Fs3Zg2eTeW%2Bu23Ot4BHvr5R\" rel=\"nofollow\">http:\/\/click.aliyun.com\/m\/100&#8230;<\/a>\u672c\u6587\u4e3a\u963f\u91cc\u4e91\u539f\u521b\u5185\u5bb9\uff0c\u672a\u7ecf\u5141\u8bb8\u4e0d\u5f97\u8f6c\u8f7d\u3002<\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000042204641\">https:\/\/segmentfault.com\/a\/1190000042204641<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7b80\u4ecb\uff1a\u00a0\u5e72\u8d27\u5fc5\u5907\uff01\u4f55\u4e3a\u4eab\u53d7\u5f0f\u5f00\u53d1\uff1f\u7f16\u8005\u6309\uff1aBPF \u6280\u672f\u8fd8\u5728\u5982\u706b\u5982\u837c\u7684\u53d1\u5c55\u7740\uff0c\u672c\u6587\u5148\u901a\u8fc7\u5bf9 BPF \u77e5\u8bc6\u7684\u4ecb\u7ecd\uff0c 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