{"id":36603,"date":"2026-10-13T08:00:53","date_gmt":"2026-10-13T00:00:53","guid":{"rendered":"https:\/\/www.varidata.com\/uncategorized-zh-cn\/trace-kernel-function-latency-with-ftrace\/"},"modified":"2026-10-14T14:25:55","modified_gmt":"2026-10-14T06:25:55","slug":"trace-kernel-function-latency-with-ftrace","status":"publish","type":"post","link":"https:\/\/www.varidata.com\/zh-cn\/knowledge\/trace-kernel-function-latency-with-ftrace\/","title":{"rendered":"\u4f7f\u7528 ftrace \u8ffd\u8e2a\u5185\u6838\u51fd\u6570\u5ef6\u8fdf"},"content":{"rendered":"\n<p>\u5f53\u4e00\u53f0 Linux \u7cfb\u7edf\u8ba9\u4eba\u611f\u89c9\u201c\u53d8\u6162\u4e86\u201d\uff0c\u4f46\u5e38\u89c1\u76d1\u63a7\u56fe\u8868\u770b\u8d77\u6765\u5374\u5e76\u65e0\u5f02\u5e38\u65f6\uff0c\u771f\u6b63\u7f3a\u5931\u7684\u4fe1\u53f7\u5f80\u5f80\u57cb\u85cf\u5728\u7528\u6237\u6001\u4e4b\u4e0b\u3002\u8fd9\u65f6\uff0cftrace \u5c31\u663e\u5f97\u5c24\u4e3a\u6709\u7528\u3002\u5bf9\u4e8e\u8d1f\u8d23<a href=\"https:\/\/www.varidata.com\/zh-cn\/server\/tokyo\/\" target=\"_blank\">\u670d\u52a1\u5668\u79df\u7528\u57fa\u7840\u8bbe\u65bd<\/a>\u3001\u5e95\u5c42\u5e73\u53f0\uff0c\u6216\u5bf9\u5ef6\u8fdf\u9ad8\u5ea6\u654f\u611f\u670d\u52a1\u7684\u5de5\u7a0b\u5e08\u800c\u8a00\uff0cftrace \u80fd\u63ed\u793a\u5185\u6838\u7a76\u7adf\u5982\u4f55\u8d70\u8fc7\u4e00\u6761\u4ee3\u7801\u8def\u5f84\u3001\u65f6\u95f4\u6d88\u8017\u5728\u4f55\u5904\uff0c\u4ee5\u53ca\u5ef6\u8fdf\u7a76\u7adf\u6765\u81ea\u8c03\u5ea6\u3001\u4e2d\u65ad\u3001\u6587\u4ef6\u64cd\u4f5c\uff0c\u8fd8\u662f\u7f51\u7edc\u5904\u7406\u3002\u4e0e\u5176\u6839\u636e\u8868\u9762\u75c7\u72b6\u731c\u6d4b\uff0c\u4e0d\u5982\u8d34\u8fd1\u5e95\u5c42\u53bb\u89c2\u5bdf\u6267\u884c\u6d41\u7a0b\uff0c\u5e76\u5bf9\u673a\u5668\u5b9e\u9645\u5728\u505a\u4ec0\u4e48\u5efa\u7acb\u4e00\u4e2a\u7cbe\u786e\u7684\u5224\u65ad\u3002<\/p>\n<h2><strong>\u4e3a\u4ec0\u4e48 ftrace \u5bf9\u5185\u6838\u5ef6\u8fdf\u5206\u6790\u5982\u6b64\u91cd\u8981<\/strong><\/h2>\n<p>ftrace \u5185\u7f6e\u4e8e Linux \u5185\u6838\u8ffd\u8e2a\u4f53\u7cfb\u4e2d\uff0c\u4e13\u95e8\u7528\u4e8e\u901a\u8fc7 tracefs \u76f4\u63a5\u89c2\u5bdf\u5185\u6838\u884c\u4e3a\u3002\u5185\u6838\u6587\u6863\u5c06\u5b83\u63cf\u8ff0\u4e3a\u4e00\u4e2a\u6846\u67b6\uff0c\u800c\u975e\u5355\u4e00\u8ffd\u8e2a\u5668\uff1b\u5b83\u652f\u6301\u51fd\u6570\u8ffd\u8e2a\u3001\u51fd\u6570\u56fe\u8ffd\u8e2a\u3001\u4e8b\u4ef6\u8ffd\u8e2a\u4ee5\u53ca\u9762\u5411\u5ef6\u8fdf\u5206\u6790\u7684\u8ffd\u8e2a\u6a21\u5f0f\u3002\u73b0\u4ee3\u7cfb\u7edf\u901a\u5e38\u4f1a\u5728 <code>\/sys\/kernel\/tracing<\/code> \u4e0b\u66b4\u9732\u63a7\u5236\u6587\u4ef6\uff0c\u800c\u8f83\u65e7\u7684\u5e03\u5c40\u5219\u53ef\u80fd\u4ecd\u901a\u8fc7\u8c03\u8bd5\u8def\u5f84\u63d0\u4f9b\u517c\u5bb9\u652f\u6301\u3002\u5b9e\u9645\u610f\u4e49\u5f88\u76f4\u63a5\uff1a\u5982\u679c\u4f60\u9700\u8981\u68c0\u67e5\u5185\u6838\u4fa7\u7684\u5ef6\u8fdf\u95ee\u9898\uff0cftrace \u5f80\u5f80\u5df2\u7ecf\u5b58\u5728\u4e8e\u8bb8\u591a\u670d\u52a1\u5668\u73af\u5883\u4e2d\u3002<\/p>\n<p>\u5b83\u7279\u522b\u6709\u5438\u5f15\u529b\u7684\u4e00\u70b9\uff0c\u5728\u4e8e\u80fd\u591f\u805a\u7126\u4e8e\u8c03\u7528\u8def\u5f84\uff0c\u800c\u4e0d\u662f\u505c\u7559\u5728\u5bbd\u6cdb\u7684\u5e73\u5747\u503c\u5c42\u9762\u3002\u901a\u7528\u76d1\u63a7\u5de5\u5177\u53ef\u4ee5\u544a\u8bc9\u4f60\u54cd\u5e94\u65f6\u95f4\u4e0d\u7a33\u5b9a\uff0c\u4f46 ftrace \u80fd\u8fdb\u4e00\u6b65\u5c55\u793a\uff1a\u67d0\u4e2a\u8bf7\u6c42\u8fdb\u5165\u4e86\u4e00\u4e2a\u5185\u6838\u8def\u5f84\uff0c\u8c03\u7528\u4e86\u7279\u5b9a\u51fd\u6570\uff0c\u7ee7\u7eed\u6df1\u5165\u5230\u66f4\u6df1\u7684\u5206\u652f\uff0c\u6700\u7ec8\u8fd4\u56de\u65f6\u5374\u6bd4\u9884\u671f\u66f4\u6162\u3002\u5bf9\u4e8e\u90a3\u4e9b\u95f4\u6b47\u6027\u51fa\u73b0\u3001\u8303\u56f4\u5f88\u7a84\u3001\u53c8\u96be\u4ee5\u901a\u8fc7\u7c97\u7c92\u5ea6\u6027\u80fd\u5206\u6790\u5b9a\u4f4d\u7684\u95ee\u9898\uff0c\u8fd9\u79cd\u53ef\u89c1\u6027\u6781\u5177\u4ef7\u503c\u3002<\/p>\n<ul>\n<li>\u5b83\u53ef\u4ee5\u5728\u51fd\u6570\u8fdb\u5165\u65f6\u8ffd\u8e2a\u5185\u6838\u51fd\u6570\uff0c\u800c\u5728\u56fe\u6a21\u5f0f\u4e0b\u8fd8\u80fd\u8bb0\u5f55\u51fd\u6570\u9000\u51fa\u3002<\/li>\n<li>\u5b83\u6709\u52a9\u4e8e\u5b9a\u4f4d\u5ef6\u8fdf\u4ece\u54ea\u91cc\u5f00\u59cb\uff0c\u800c\u4e0d\u53ea\u662f\u5ef6\u8fdf\u6700\u7ec8\u5728\u54ea\u91cc\u88ab\u89c2\u5bdf\u5230\u3002<\/li>\n<li>\u5b83\u5c24\u5176\u64c5\u957f\u8c03\u8bd5\u8be1\u5f02\u7684\u6296\u52a8\u95ee\u9898\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u660e\u663e\u7684\u541e\u5410\u5d29\u584c\u3002<\/li>\n<li>\u5b83\u53ef\u4ee5\u901a\u8fc7\u7b5b\u9009\u76ee\u6807\u51fd\u6570\u6765\u6536\u7a84\u8303\u56f4\uff0c\u4ece\u800c\u8ba9\u8ffd\u8e2a\u7ed3\u679c\u4fdd\u6301\u53ef\u8bfb\u3002<\/li>\n<\/ul>\n<h2><strong>\u54ea\u4e9b\u670d\u52a1\u5668\u573a\u666f\u6700\u9002\u5408\u4f7f\u7528 ftrace<\/strong><\/h2>\n<p>\u5185\u6838\u8ffd\u8e2a\u5e76\u4e0d\u662f\u4eea\u8868\u76d8\u4e00\u53d8\u7ea2\u5c31\u5e94\u8be5\u7acb\u523b\u5f00\u542f\u7684\u5de5\u5177\u3002\u5b83\u6700\u6709\u4ef7\u503c\u7684\u573a\u666f\uff0c\u662f\u7cfb\u7edf\u51fa\u73b0\u4e86\u7528\u6237\u771f\u5b9e\u53ef\u611f\u77e5\u3001\u4f46\u5bf9\u5e38\u89c4\u5de5\u5177\u6765\u8bf4\u53c8\u76f8\u5f53\u6a21\u7cca\u7684\u5f02\u5e38\u3002\u6700\u5e38\u89c1\u7684\u6a21\u5f0f\u662f\uff1a\u5e94\u7528\u65e5\u5fd7\u663e\u793a\u5b58\u5728\u5361\u987f\uff0c\u53ef CPU \u4f7f\u7528\u7387\u3001\u5185\u5b58\u538b\u529b\u548c\u5b58\u50a8\u6307\u6807\u5374\u65e0\u6cd5\u5145\u5206\u89e3\u91ca\u95ee\u9898\u3002<\/p>\n<ol>\n<li><strong>\u8bf7\u6c42\u8def\u5f84\u6296\u52a8\uff1a<\/strong>\u5e76\u53d1\u4e0a\u6765\u540e\u5ef6\u8fdf\u7a81\u589e\uff0c\u4f46\u5de5\u4f5c\u8fdb\u7a0b\u5e76\u6ca1\u6709\u8868\u73b0\u51fa\u7a33\u5b9a\u7684\u7528\u6237\u6001\u70ed\u70b9\u3002<\/li>\n<li><strong>I\/O \u5361\u987f\uff1a<\/strong>\u8bfb\u5199\u8def\u5f84\u5076\u53d1\u6027\u505c\u987f\uff0c\u8db3\u4ee5\u62c9\u9ad8\u5c3e\u5ef6\u8fdf\uff0c\u800c\u961f\u5217\u89c6\u56fe\u770b\u8d77\u6765\u5374\u5e76\u4e0d\u5938\u5f20\u3002<\/li>\n<li><strong>\u7f51\u7edc\u5904\u7406\u5ef6\u8fdf\uff1a<\/strong>\u6570\u636e\u5305\u5df2\u7ecf\u5230\u8fbe\uff0c\u4f46\u5728\u534f\u8bae\u6808\u4e2d\u7684\u5904\u7406\u4f3c\u4e4e\u5ffd\u5feb\u5ffd\u6162\u3002<\/li>\n<li><strong>\u8c03\u5ea6\u5f02\u5e38\uff1a<\/strong>\u7ebf\u7a0b\u5df2\u7ecf\u88ab\u5524\u9192\uff0c\u5374\u6ca1\u6709\u5728\u9884\u671f\u65f6\u95f4\u5185\u771f\u6b63\u8fd0\u884c\u3002<\/li>\n<li><strong>\u4e2d\u65ad\u76f8\u5173\u5e72\u6270\uff1a<\/strong>\u7cfb\u7edf\u51fa\u73b0\u6210\u7c07\u7684\u65f6\u95f4\u566a\u58f0\uff0c\u6697\u793a\u4e2d\u65ad\u88ab\u5173\u95ed\u8fc7\u4e45\u6216\u5904\u7406\u88ab\u5ef6\u540e\u3002<\/li>\n<\/ol>\n<p>\u5728\u8fd9\u4e9b\u573a\u666f\u4e2d\uff0cftrace \u5e76\u4e0d\u662f\u4e3a\u4e86\u66ff\u4ee3\u5e38\u89c4\u53ef\u89c2\u6d4b\u6027\u5de5\u5177\u3002\u5b83\u66f4\u50cf\u662f\u5728\u4f60\u5df2\u7ecf\u6846\u5b9a\u75c7\u72b6\u4e4b\u540e\uff0c\u8fdb\u4e00\u6b65\u6df1\u5165\u5185\u6838\u8def\u5f84\u3001\u67e5\u660e\u95ee\u9898\u662f\u5982\u4f55\u4f20\u9012\u548c\u653e\u5927\u7684\u5173\u952e\u6b65\u9aa4\u3002<\/p>\n<h2><strong>ftrace \u5728\u5e95\u5c42\u662f\u5982\u4f55\u5de5\u4f5c\u7684<\/strong><\/h2>\n<p>\u51fd\u6570\u8ffd\u8e2a\u5668\u4f1a\u8bb0\u5f55\u5185\u6838\u51fd\u6570\u7684\u8fdb\u5165\uff0c\u800c <code>function_graph<\/code> \u8ffd\u8e2a\u5668\u4f1a\u540c\u65f6\u8bb0\u5f55\u51fd\u6570\u8fdb\u5165\u4e0e\u8fd4\u56de\uff0c\u56e0\u6b64\u80fd\u591f\u4f30\u7b97\u6267\u884c\u65f6\u957f\uff0c\u5e76\u7ed8\u5236\u51fa\u7c7b\u4f3c\u7ed3\u6784\u5316\u4ee3\u7801\u7684\u8c03\u7528\u56fe\u3002\u6839\u636e\u5185\u6838\u6587\u6863\uff0c\u8fd9\u79cd\u56fe\u6a21\u5f0f\u5728\u6392\u67e5\u5f02\u5e38\u5ef6\u8fdf\u3001\u6216\u7406\u89e3\u67d0\u4e2a\u51fd\u6570\u5b9e\u9645\u8d70\u4e86\u54ea\u6761\u8def\u5f84\u65f6\u5c24\u5176\u6709\u4ef7\u503c\u3002\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48\u5927\u591a\u6570\u5ef6\u8fdf\u95ee\u9898\u5206\u6790\u4f1a\u4f18\u5148\u9009\u62e9\u56fe\u6a21\u5f0f\uff0c\u800c\u4e0d\u662f\u666e\u901a\u51fd\u6570\u6a21\u5f0f\u3002<\/p>\n<p>\u8ffd\u8e2a\u8fc7\u7a0b\u901a\u8fc7 tracefs \u4e2d\u7684\u4e00\u7ec4\u6587\u4ef6\u8fdb\u884c\u63a7\u5236\u3002\u4f60\u53ef\u4ee5\u5207\u6362\u6d3b\u52a8\u8ffd\u8e2a\u5668\u3001\u5f00\u542f\u6216\u5173\u95ed\u91c7\u96c6\u3001\u9009\u62e9\u6027\u8fc7\u6ee4\u76ee\u6807\u51fd\u6570\u3001\u89e6\u53d1\u5de5\u4f5c\u8d1f\u8f7d\uff0c\u7136\u540e\u67e5\u770b\u751f\u6210\u7684\u8f93\u51fa\u7ed3\u679c\u3002\u7531\u4e8e\u8fd9\u4e00\u63a7\u5236\u63a5\u53e3\u57fa\u4e8e\u6587\u4ef6\uff0c\u56e0\u6b64\u5b83\u975e\u5e38\u5bb9\u6613\u811a\u672c\u5316\uff0c\u4e5f\u5f88\u9002\u5408\u96c6\u6210\u8fdb\u6545\u969c\u5904\u7406\u6d41\u7a0b\u3002\u5185\u6838\u6587\u6863\u8fd8\u6307\u51fa\uff0c\u8ffd\u8e2a\u6570\u636e\u4f1a\u7f13\u5b58\u5728\u5185\u5b58\u9875\u4e2d\uff0c\u8fd9\u4e5f\u6b63\u662f\u4e3a\u4ec0\u4e48\u5e94\u5f53\u5c3d\u91cf\u6536\u7a84\u8303\u56f4\u5e76\u7f29\u77ed\u91c7\u96c6\u7a97\u53e3\u3002<\/p>\n<h2><strong>\u5f00\u59cb\u8ffd\u8e2a\u524d\u5982\u4f55\u51c6\u5907\u73af\u5883<\/strong><\/h2>\n<p>\u5728\u771f\u6b63\u91c7\u96c6\u6570\u636e\u4e4b\u524d\uff0c\u5148\u786e\u8ba4\u8ffd\u8e2a\u80fd\u529b\u53ef\u7528\uff0c\u5e76\u786e\u8ba4\u7cfb\u7edf\u4f7f\u7528\u7684\u662f\u6b63\u786e\u6587\u4ef6\u7cfb\u7edf\u8def\u5f84\u3002\u5f53\u524d\u5185\u6838\u6587\u6863\u5c06 <code>\/sys\/kernel\/tracing<\/code> \u6307\u5b9a\u4e3a\u6807\u51c6 tracefs \u4f4d\u7f6e\uff0c\u800c\u65e7\u7248\u517c\u5bb9\u8def\u5f84\u5219\u53ef\u80fd\u4ecd\u66b4\u9732\u5728\u8c03\u8bd5\u76ee\u5f55\u4e0b\u3002\u5982\u679c tracefs \u5c1a\u672a\u6302\u8f7d\uff0c\u4e5f\u53ef\u4ee5\u624b\u52a8\u6302\u8f7d\u3002\u8fd9\u4e00\u70b9\u5f88\u91cd\u8981\uff0c\u56e0\u4e3a\u8bb8\u591a\u65e7\u6559\u7a0b\u4ecd\u9ed8\u8ba4\u53ea\u4f7f\u7528\u4f20\u7edf\u8def\u5f84\u3002<\/p>\n<ul>\n<li>\u4f7f\u7528\u5177\u5907\u8db3\u591f\u6743\u9650\u7684 shell\u3002<\/li>\n<li>\u68c0\u67e5 tracefs \u662f\u5426\u5b58\u5728\u5e76\u5df2\u6302\u8f7d\u3002<\/li>\n<li>\u67e5\u770b <code>available_tracers<\/code>\uff0c\u786e\u8ba4\u56fe\u8ffd\u8e2a\u652f\u6301\u662f\u5426\u53ef\u7528\u3002<\/li>\n<li>\u89c4\u5212\u4e00\u4e2a\u5c3d\u53ef\u80fd\u77ed\u7684\u95ee\u9898\u590d\u73b0\u7a97\u53e3\u3002<\/li>\n<li>\u51b3\u5b9a\u662f\u5426\u9700\u8981\u51fd\u6570\u8fc7\u6ee4\uff0c\u6216\u8005\u6309 PID \u8fc7\u6ee4\u3002<\/li>\n<\/ul>\n<p>\u5728\u63a5\u8fd1\u751f\u4ea7\u7684\u673a\u5668\u4e0a\uff0c\u8c28\u614e\u5f80\u5f80\u6bd4\u70ab\u6280\u66f4\u91cd\u8981\u3002\u957f\u65f6\u95f4\u8ffd\u8e2a\u6240\u6709\u5185\u5bb9\uff0c\u53cd\u800c\u53ef\u80fd\u626d\u66f2\u4f60\u771f\u6b63\u60f3\u6d4b\u91cf\u7684\u65f6\u5e8f\u3002\u4e00\u6b21\u77ed\u5c0f\u3001\u5b9a\u5411\u7684\u91c7\u96c6\uff0c\u901a\u5e38\u6bd4\u4e00\u4efd\u5de8\u5927\u5374\u96be\u4ee5\u63a8\u7406\u7684\u8ffd\u8e2a\u7ed3\u679c\u66f4\u6709\u4fe1\u606f\u91cf\u3002<\/p>\n<h2><strong>\u8ffd\u8e2a\u5185\u6838\u51fd\u6570\u5ef6\u8fdf\u7684\u5b9e\u7528\u6d41\u7a0b<\/strong><\/h2>\n<p>\u6700\u5e72\u51c0\u7684\u65b9\u6cd5\uff0c\u662f\u628a\u8ffd\u8e2a\u5f53\u4f5c\u4e00\u6b21\u53d7\u63a7\u5b9e\u9a8c\u3002\u5148\u6e05\u7a7a\u73af\u5883\uff0c\u5b9a\u4e49\u8303\u56f4\uff0c\u590d\u73b0\u4e00\u6b21\u95ee\u9898\uff0c\u7acb\u523b\u505c\u6b62\uff0c\u7136\u540e\u5e26\u7740\u4e00\u4e2a\u660e\u786e\u7684\u95ee\u9898\u53bb\u9605\u8bfb\u8ffd\u8e2a\u7ed3\u679c\u3002<\/p>\n<ol>\n<li><strong>\u91cd\u7f6e\u72b6\u6001\uff1a<\/strong>\u6e05\u9664\u65e7\u7684\u8ffd\u8e2a\u8f93\u51fa\uff0c\u5e76\u786e\u4fdd\u8ffd\u8e2a\u5904\u4e8e\u5173\u95ed\u72b6\u6001\u3002<\/li>\n<li><strong>\u9009\u62e9\u56fe\u6a21\u5f0f\uff1a<\/strong>\u5c06 <code>function_graph<\/code> \u5199\u5165 <code>current_tracer<\/code>\u3002<\/li>\n<li><strong>\u9650\u5236\u76ee\u6807\u8303\u56f4\uff1a<\/strong>\u4f7f\u7528 <code>set_ftrace_filter<\/code>\uff0c\u53ea\u5305\u542b\u76f8\u5173\u51fd\u6570\u6216\u8def\u5f84\u3002<\/li>\n<li><strong>\u6309\u8fdb\u7a0b\u8fdb\u4e00\u6b65\u6536\u7a84\uff1a<\/strong>\u5982\u679c\u95ee\u9898\u4e0e\u67d0\u4e2a\u7279\u5b9a\u8d1f\u8f7d\u6709\u5173\uff0c\u53ef\u4f7f\u7528 PID \u8fc7\u6ee4\u3002<\/li>\n<li><strong>\u5f00\u542f\u8ffd\u8e2a\uff1a<\/strong>\u53ea\u6709\u5728\u51c6\u5907\u597d\u89e6\u53d1\u95ee\u9898\u65f6\u624d\u6253\u5f00\u91c7\u96c6\u3002<\/li>\n<li><strong>\u590d\u73b0\u4e00\u6b21\u95ee\u9898\uff1a<\/strong>\u4f7f\u7528\u6700\u77ed\u7684\u5de5\u4f5c\u8d1f\u8f7d\u89e6\u53d1\u8be5\u5f02\u5e38\u3002<\/li>\n<li><strong>\u505c\u6b62\u8ffd\u8e2a\uff1a<\/strong>\u7acb\u523b\u5173\u95ed\u91c7\u96c6\uff0c\u5e76\u8bfb\u53d6 trace \u6587\u4ef6\u3002<\/li>\n<\/ol>\n<p>\u8fd9\u79cd\u6d41\u7a0b\u4e0e\u5b98\u65b9\u8ffd\u8e2a\u6a21\u578b\u9ad8\u5ea6\u5951\u5408\u3002\u5185\u6838\u901a\u8fc7\u4e13\u7528\u6587\u4ef6\u5206\u522b\u63d0\u4f9b\u6d3b\u52a8\u8ffd\u8e2a\u5668\u3001\u51fd\u6570\u8fc7\u6ee4\u5668\u3001\u8ffd\u8e2a\u7f13\u51b2\u533a\u548c\u8ffd\u8e2a\u5f00\u5173\u3002\u6587\u6863\u660e\u786e\u6307\u51fa\uff0c\u8fc7\u6ee4\u6587\u4ef6\u4e2d\u5217\u51fa\u7684\u51fd\u6570\u4f1a\u9650\u5236\u56fe\u8ffd\u8e2a\u5668\u6240\u8ddf\u968f\u7684\u8303\u56f4\uff0c\u5e76\u5305\u542b\u8fd9\u4e9b\u51fd\u6570\u6240\u8c03\u7528\u7684\u4e0b\u5c42\u51fd\u6570\uff0c\u8fd9\u6b63\u662f\u56fe\u6a21\u5f0f\u5728\u771f\u5b9e\u8c03\u8bd5\u4e2d\u4ecd\u7136\u53ef\u63a7\u3001\u53ef\u8bfb\u7684\u5173\u952e\u539f\u56e0\u3002<\/p>\n<p>\u4e00\u4e2a\u5f88\u201c\u6781\u5ba2\u201d\u4f46\u4e5f\u975e\u5e38\u6709\u7528\u7684\u4e60\u60ef\uff0c\u662f\u5728\u91c7\u96c6\u4e4b\u524d\u5148\u5efa\u7acb\u5047\u8bbe\u3002\u6bd4\u5982\uff1a\u201c\u6211\u6000\u7591\u5ef6\u8fdf\u53d1\u751f\u5728\u5524\u9192\u4e4b\u540e\u4f46\u7ebf\u7a0b\u5c1a\u672a\u771f\u6b63\u8fd0\u884c\u7684\u9636\u6bb5\u201d\uff0c\u6216\u8005\u201c\u6211\u6000\u7591\u65f6\u95f4\u6d88\u8017\u5728\u6587\u4ef6\u8def\u5f84\u5185\u90e8\u201d\u3002\u5e26\u7740\u8fd9\u79cd\u6846\u67b6\u53bb\u91c7\u96c6\uff0c\u4f60\u5c31\u4e0d\u662f\u5728\u673a\u68b0\u5730\u8bb0\u5f55\u4e00\u5f20\u8c03\u7528\u56fe\uff0c\u800c\u662f\u5728\u9a8c\u8bc1\u4e00\u4e2a\u89e3\u91ca\u3002<\/p>\n<h2><strong>\u5982\u4f55\u8bfb trace\uff0c\u800c\u4e0d\u662f\u88ab trace \u8bef\u5bfc<\/strong><\/h2>\n<p>\u539f\u59cb\u8f93\u51fa\u4e00\u5f00\u59cb\u53ef\u80fd\u4f1a\u663e\u5f97\u9887\u4e3a\u5413\u4eba\uff0c\u56e0\u4e3a\u5b83\u540c\u65f6\u53cd\u6620\u4e86\u5d4c\u5957\u5c42\u6b21\u3001\u65f6\u95f4\u4fe1\u606f\u548c\u6267\u884c\u4e0a\u4e0b\u6587\u3002\u5173\u952e\u5e76\u4e0d\u662f\u76ef\u7740\u6574\u4efd\u8f93\u51fa\u53d1\u5446\uff0c\u800c\u662f\u4ece\u90a3\u4e9b\u660e\u663e\u7f13\u6162\u7684\u8fd4\u56de\u5757\u5f00\u59cb\uff0c\u518d\u9010\u6b65\u5411\u5916\u770b\u3002\u5728\u56fe\u6a21\u5f0f\u4e2d\uff0c\u4e00\u4e2a\u7236\u51fd\u6570\u8017\u65f6\u5f88\u957f\uff0c\u5e76\u4e0d\u603b\u610f\u5473\u7740\u7236\u51fd\u6570\u672c\u8eab\u5f88\u6162\u3002\u65f6\u95f4\u6709\u53ef\u80fd\u6d88\u8017\u5728\u5176\u5b50\u51fd\u6570\u4e2d\uff0c\u4e5f\u53ef\u80fd\u6765\u81ea\u8c03\u5ea6\u4e2d\u65ad\uff0c\u6216\u8005\u6765\u81ea\u8c03\u7528\u5e27\u4fdd\u6301\u6253\u5f00\u65f6\u53d1\u751f\u7684\u7b49\u5f85\u3002<\/p>\n<ul>\n<li>\u4f18\u5148\u5bfb\u627e\u90a3\u4e9b\u4f4d\u4e8e\u4f60\u6000\u7591\u8def\u5f84\u4e0a\u7684\u5f02\u5e38\u957f\u8fd4\u56de\u3002<\/li>\n<li>\u6bd4\u8f83\u540c\u4e00\u7236\u8282\u70b9\u4e0b\u7684\u5144\u5f1f\u8c03\u7528\uff0c\u770b\u5206\u652f\u5728\u54ea\u91cc\u5f00\u59cb\u51fa\u73b0\u5dee\u5f02\u3002<\/li>\n<li>\u89c2\u5bdf\u5ef6\u8fdf\u662f\u5426\u603b\u662f\u91cd\u590d\u51fa\u73b0\u5728\u540c\u4e00\u51fd\u6570\u4e2d\uff0c\u8fd8\u662f\u5728\u4e0d\u540c\u5c42\u4e4b\u95f4\u8fc1\u79fb\u3002<\/li>\n<li>\u5982\u679c\u542f\u7528\u4e86\u66f4\u591a\u4e0a\u4e0b\u6587\u4fe1\u606f\uff0c\u53ef\u7ed3\u5408\u5524\u9192\u3001\u4e2d\u65ad\u6216\u5b58\u50a8\u4e8b\u4ef6\u4e00\u8d77\u5224\u65ad\u3002<\/li>\n<\/ul>\n<p>\u5185\u6838\u6587\u6863\u8fd8\u63cf\u8ff0\u4e86\u82e5\u5e72\u9762\u5411\u5ef6\u8fdf\u5206\u6790\u7684\u8ffd\u8e2a\u5668\u4e0e\u683c\u5f0f\u9009\u9879\uff0c\u53ef\u5411\u8ffd\u8e2a\u7ed3\u679c\u4e2d\u52a0\u5165\u66f4\u591a\u4e0a\u4e0b\u6587\u5b57\u6bb5\uff0c\u5e2e\u52a9\u7406\u89e3\u8c03\u5ea6\u548c\u4e2d\u65ad\u72b6\u6001\u3002\u5f53\u666e\u901a\u51fd\u6570\u8ffd\u8e2a\u8fc7\u4e8e\u5608\u6742\u65f6\uff0c\u9002\u5ea6\u5f15\u5165\u57fa\u4e8e\u4e8b\u4ef6\u7684\u4e0a\u4e0b\u6587\uff0c\u5f80\u5f80\u80fd\u89e3\u91ca\u67d0\u4e2a\u957f\u65f6\u95f4\u533a\u95f4\u4e3a\u4f55\u51fa\u73b0\uff0c\u800c\u65e0\u9700\u8ffd\u8e2a\u7cfb\u7edf\u4e2d\u7684\u6bcf\u4e00\u4e2a\u51fd\u6570\u3002<\/p>\n<h2><strong>\u51fd\u6570\u8ffd\u8e2a\u5668\u4e0e\u51fd\u6570\u56fe\u8ffd\u8e2a\u5668\u7684\u533a\u522b<\/strong><\/h2>\n<p>\u4e24\u8005\u90fd\u5f88\u6709\u7528\uff0c\u4f46\u56de\u7b54\u7684\u95ee\u9898\u5e76\u4e0d\u76f8\u540c\u3002\u57fa\u7840\u51fd\u6570\u8ffd\u8e2a\u5668\u66f4\u9002\u5408\u786e\u8ba4\u67d0\u6761\u8def\u5f84\u662f\u5426\u88ab\u8fdb\u5165\uff0c\u800c\u56fe\u8ffd\u8e2a\u5668\u66f4\u9002\u5408\u56de\u7b54\u201c\u8fd9\u6761\u8def\u5f84\u505c\u7559\u4e86\u591a\u4e45\uff0c\u4ee5\u53ca\u5d4c\u5957\u8c03\u7528\u662f\u5982\u4f55\u5c55\u5f00\u7684\u201d\u3002\u5b98\u65b9\u6587\u6863\u6307\u51fa\uff0c\u56fe\u8ffd\u8e2a\u4f1a\u8bb0\u5f55\u8fdb\u5165\u548c\u9000\u51fa\uff0c\u76ee\u7684\u662f\u6d4b\u91cf\u6267\u884c\u65f6\u95f4\u5e76\u751f\u6210\u53ef\u9760\u7684\u8c03\u7528\u56fe\u3002\u5728\u5ef6\u8fdf\u5206\u6790\u4e2d\uff0c\u8fd9\u901a\u5e38\u6b63\u662f\u6700\u6709\u4ef7\u503c\u7684\u80fd\u529b\u3002<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u51fd\u6570\u6a21\u5f0f<\/strong>\uff0c\u5f53\u4f60\u7684\u9996\u8981\u76ee\u6807\u662f\u53d1\u73b0\u8c03\u7528\u8def\u5f84\u3002<\/li>\n<li><strong>\u4f7f\u7528\u56fe\u6a21\u5f0f<\/strong>\uff0c\u5f53\u4f60\u7684\u76ee\u6807\u662f\u5206\u6790\u6267\u884c\u65f6\u957f\u548c\u7ed3\u6784\u3002<\/li>\n<li><strong>\u4f7f\u7528\u4e8b\u4ef6\u4e0a\u4e0b\u6587<\/strong>\uff0c\u5f53\u4ec5\u51ed\u65f6\u95f4\u4fe1\u606f\u4e0d\u8db3\u4ee5\u89e3\u91ca\u505c\u987f\u539f\u56e0\u3002<\/li>\n<\/ul>\n<h2><strong>\u771f\u5b9e\u8c03\u8bd5\u4e2d\u7684\u5e38\u89c1\u5206\u6790\u6a21\u5f0f<\/strong><\/h2>\n<p>\u5728\u5206\u6790\u5b58\u50a8\u76f8\u5173\u5ef6\u8fdf\u65f6\uff0c\u4e00\u4e2a\u5b9e\u7528\u6a21\u5f0f\u662f\u56f4\u7ed5\u6587\u4ef6\u5c42\u6216\u5757\u5c42\u8def\u5f84\u8bbe\u7f6e\u8fc7\u6ee4\uff0c\u7136\u540e\u89c2\u5bdf\u8c03\u7528\u56fe\u5728\u54ea\u4e2a\u5206\u652f\u5f00\u59cb\u201c\u5f20\u5f00\u201d\u3002\u5982\u679c\u67d0\u4e2a\u5206\u652f\u53cd\u590d\u62c9\u957f\uff0c\u800c\u5176\u4ed6\u5206\u652f\u8fd4\u56de\u5f88\u5feb\uff0c\u90a3\u4e48\u4f60\u5c31\u627e\u5230\u4e86\u503c\u5f97\u8fdb\u4e00\u6b65\u6df1\u6316\u7684\u5019\u9009\u5c42\u3002\u7c7b\u4f3c\u7684\u65b9\u6cd5\u540c\u6837\u9002\u7528\u4e8e\u7f51\u7edc\u95ee\u9898\uff1a\u4ece\u63a5\u6536\u6216\u53d1\u9001\u5904\u7406\u9644\u8fd1\u5f00\u59cb\uff0c\u89c2\u5bdf\u65f6\u95f4\u7a76\u7adf\u662f\u5728\u534f\u8bae\u6808\u5904\u7406\u3001\u961f\u5217\u79fb\u52a8\uff0c\u8fd8\u662f\u5728\u7ebf\u7a0b\u5524\u9192\u884c\u4e3a\u4e2d\u88ab\u62c9\u957f\u3002<\/p>\n<p>\u5bf9\u4e8e\u504f\u8c03\u5ea6\u7c7b\u7684\u95ee\u9898\uff0c\u4ec5\u9760\u56fe\u8f93\u51fa\u5f80\u5f80\u8fd8\u4e0d\u591f\u3002\u8fd9\u65f6\uff0c\u5ef6\u8fdf\u7c7b\u8ffd\u8e2a\u5668\u6216\u8c03\u5ea6\u76f8\u5173\u4e8b\u4ef6\u4f1a\u66f4\u6709\u4ef7\u503c\u3002\u5185\u6838\u8ffd\u8e2a\u6587\u6863\u5305\u542b\u4e13\u95e8\u9762\u5411\u5524\u9192\u548c\u4e2d\u65ad\u5206\u6790\u7684\u5ef6\u8fdf\u6a21\u5f0f\uff0c\u5b83\u4eec\u53ef\u4ee5\u5e2e\u52a9\u4f60\u5224\u65ad\uff1a\u67d0\u4e2a\u4efb\u52a1\u7a76\u7adf\u662f\u5df2\u7ecf\u51c6\u5907\u597d\u5374\u6ca1\u80fd\u53ca\u65f6\u8fd0\u884c\uff0c\u8fd8\u662f\u65f6\u5e8f\u88ab\u4e2d\u65ad\u72b6\u6001\u6270\u4e71\u4e86\u3002<\/p>\n<h2><strong>\u8ffd\u8e2a\u670d\u52a1\u5668\u65f6\u6700\u5e38\u89c1\u7684\u9519\u8bef<\/strong><\/h2>\n<p>\u5927\u591a\u6570\u7cdf\u7cd5\u7684\u8ffd\u8e2a\u7ed3\u679c\uff0c\u5931\u8d25\u539f\u56e0\u66f4\u591a\u5728\u4eba\uff0c\u800c\u4e0d\u5728\u6280\u672f\u672c\u8eab\u3002\u8981\u4e48\u8303\u56f4\u592a\u5bbd\uff0c\u8981\u4e48\u5b9e\u9a8c\u65f6\u95f4\u592a\u957f\uff0c\u8981\u4e48\u9605\u8bfb\u8005\u628a\u8868\u8c61\u8bef\u8ba4\u4e3a\u6839\u56e0\u3002\u597d\u7684\u8ffd\u8e2a\u4e00\u5b9a\u662f\u6709\u9009\u62e9\u6027\u7684\u3002<\/p>\n<ol>\n<li><strong>\u8ffd\u8e2a\u6574\u4e2a\u5185\u6838\uff1a<\/strong>\u8fd9\u4f1a\u5e26\u6765\u5927\u91cf\u566a\u58f0\uff0c\u5e76\u589e\u52a0\u989d\u5916\u5f00\u9500\u3002<\/li>\n<li><strong>\u91c7\u96c6\u65f6\u95f4\u8fc7\u957f\uff1a<\/strong>\u5de8\u5927\u7684\u7f13\u51b2\u533a\u53ea\u4f1a\u8ba9\u89e3\u91ca\u66f4\u56f0\u96be\uff0c\u800c\u4e0d\u662f\u66f4\u7b80\u5355\u3002<\/li>\n<li><strong>\u8fc7\u6ee4\u4e86\u9519\u8bef\u7b26\u53f7\uff1a<\/strong>\u547d\u540d\u3001\u5185\u8054\u4f18\u5316\u6216\u5185\u6838\u5dee\u5f02\uff0c\u90fd\u53ef\u80fd\u8ba9\u4f60\u4ee5\u4e3a\u4f1a\u51fa\u73b0\u7684\u8def\u5f84\u6d88\u5931\u3002<\/li>\n<li><strong>\u5ffd\u7565\u4e0a\u4e0b\u6587\uff1a<\/strong>\u4e00\u4e2a\u8017\u65f6\u957f\u7684\u51fd\u6570\uff0c\u53ef\u80fd\u53ea\u662f\u53cd\u6620\u5176\u4e0b\u5c42\u53d1\u751f\u4e86\u7b49\u5f85\uff0c\u800c\u975e\u81ea\u8eab\u8ba1\u7b97\u8fc7\u6162\u3002<\/li>\n<li><strong>\u7f3a\u4e4f\u590d\u73b0\u7eaa\u5f8b\uff1a<\/strong>\u5982\u679c\u6bcf\u6b21\u5b9e\u9a8c\u5de5\u4f5c\u8d1f\u8f7d\u90fd\u4e0d\u540c\uff0c\u90a3\u4e48\u6bd4\u8f83\u5c31\u5931\u53bb\u4e86\u610f\u4e49\u3002<\/li>\n<\/ol>\n<p>\u6587\u6863\u4e2d\u8fd8\u6709\u4e00\u4e2a\u7ec6\u5fae\u4f46\u91cd\u8981\u7684\u63d0\u9192\uff1a\u8ffd\u8e2a\u529f\u80fd\u4e0e\u5177\u4f53\u6587\u4ef6\u5728\u4e0d\u540c\u5185\u6838\u80fd\u529b\u548c\u914d\u7f6e\u4e0b\u53ef\u80fd\u6709\u6240\u5dee\u5f02\u3002\u56e0\u6b64\uff0c\u5982\u679c\u67d0\u7bc7\u6559\u7a0b\u4e0e\u4f60\u7684\u7cfb\u7edf\u4e0d\u5b8c\u5168\u4e00\u81f4\uff0c\u4e0d\u8981\u5f3a\u884c\u7167\u642c\u547d\u4ee4\uff0c\u800c\u5e94\u5148\u68c0\u67e5\u81ea\u5df1\u673a\u5668\u4e0a\u7684 tracefs \u6811\u5b9e\u9645\u66b4\u9732\u4e86\u54ea\u4e9b\u63a5\u53e3\u3002<\/p>\n<h2><strong>ftrace \u5728\u5176\u4ed6\u5185\u6838\u53ef\u89c2\u6d4b\u6027\u5de5\u5177\u4e2d\u7684\u4f4d\u7f6e<\/strong><\/h2>\n<p>\u5f53\u4f60\u9700\u8981\u4ee5\u8f83\u4f4e\u95e8\u69db\u83b7\u5f97\u7ed3\u6784\u5316\u7684\u5185\u6838\u8def\u5f84\u53ef\u89c1\u6027\u65f6\uff0cftrace \u7684\u4f18\u52bf\u975e\u5e38\u660e\u663e\u3002\u91c7\u6837\u578b\u5de5\u5177\u66f4\u64c5\u957f\u53d1\u73b0\u70ed\u70b9\uff0c\u53ef\u7f16\u7a0b\u8ffd\u8e2a\u6846\u67b6\u5219\u66f4\u9002\u5408\u9700\u8981\u81ea\u5b9a\u4e49\u63a2\u9488\u6216\u957f\u671f\u8fd0\u884c\u89c2\u6d4b\u903b\u8f91\u7684\u573a\u666f\u3002\u4f46\u5f53\u95ee\u9898\u662f\u201c\u5f53\u524d\u5230\u5e95\u662f\u54ea\u6761\u5185\u6838\u8def\u5f84\u6162\u4e86\uff0c\u4ee5\u53ca\u5b83\u4e3a\u4ec0\u4e48\u4f1a\u8fd9\u6837\u201d\u65f6\uff0cftrace \u4f9d\u7136\u662f\u6700\u950b\u5229\u7684\u5de5\u5177\u4e4b\u4e00\uff0c\u56e0\u4e3a\u5b83\u80fd\u76f4\u8fbe\u63a7\u5236\u6d41\u672c\u8eab\u3002<\/p>\n<p>\u5bf9\u4e8e\u670d\u52a1\u5668\u79df\u7528\u4e0e\u670d\u52a1\u5668\u6258\u7ba1\u8fd0\u7ef4\u6765\u8bf4\uff0c\u8fd9\u79cd\u533a\u522b\u5c24\u5176\u91cd\u8981\u3002\u57fa\u7840\u8bbe\u65bd\u5de5\u7a0b\u5e08\u5e76\u4e0d\u603b\u9700\u8981\u5728\u6bcf\u4e00\u53f0\u8282\u70b9\u4e0a\u90e8\u7f72\u4e00\u6574\u5957\u6c38\u4e45\u6027\u7684\u8ffd\u8e2a\u5e73\u53f0\u3002\u4ed6\u4eec\u771f\u6b63\u9700\u8981\u7684\uff0c\u662f\u5728\u6545\u969c\u53d1\u751f\u65f6\uff0c\u80fd\u591f\u5feb\u901f\u4ece\u75c7\u72b6\u8d70\u5230\u5185\u6838\u8def\u5f84\u3001\u4fdd\u7559\u63a8\u7406\u4e25\u8c28\u6027\uff0c\u5e76\u4e14\u5728\u9ad8\u538b\u73af\u5883\u4e0b\u4f9d\u7136\u5bb9\u6613\u7406\u89e3\u7684\u5de5\u5177\u3002<\/p>\n<h2><strong>\u4f4e\u98ce\u9669\u8ffd\u8e2a\u7684\u6700\u4f73\u5b9e\u8df5<\/strong><\/h2>\n<ul>\n<li>\u4f18\u5148\u4f7f\u7528\u72ed\u7a84\u7684\u51fd\u6570\u8fc7\u6ee4\uff0c\u800c\u4e0d\u662f\u5168\u5c40\u91c7\u96c6\u3002<\/li>\n<li>\u53ea\u8ffd\u8e2a\u5230\u8db3\u4ee5\u590d\u73b0\u4e00\u6b21\u95ee\u9898\u4e3a\u6b62\u3002<\/li>\n<li>\u7acb\u5373\u4fdd\u5b58\u8ffd\u8e2a\u7ed3\u679c\uff0c\u5e76\u8bb0\u5f55\u89e6\u53d1\u8be5\u95ee\u9898\u7684\u5de5\u4f5c\u8d1f\u8f7d\u3002<\/li>\n<li>\u5c06\u8ffd\u8e2a\u53d1\u73b0\u4e0e\u8c03\u5ea6\u3001I\/O \u548c\u7f51\u7edc\u4fa7\u7684\u5176\u4ed6\u89c2\u6d4b\u7ed3\u5408\u8d77\u6765\u5206\u6790\u3002<\/li>\n<li>\u6bcf\u5f53\u5047\u8bbe\u53d8\u5316\u65f6\uff0c\u91cd\u65b0\u505a\u4e00\u6b21\u5b9e\u9a8c\uff0c\u800c\u4e0d\u662f\u6c38\u8fdc\u53cd\u590d\u89e3\u8bfb\u540c\u4e00\u4efd\u5de8\u5927\u8ffd\u8e2a\u3002<\/li>\n<\/ul>\n<p>\u628a ftrace \u5f53\u4f5c\u624b\u672f\u5200\u7684\u5de5\u7a0b\u5e08\uff0c\u901a\u5e38\u4f1a\u6bd4\u628a\u5b83\u5f53\u4f5c\u5927\u7f51\u4e71\u6492\u7684\u4eba\u5f97\u5230\u66f4\u597d\u7684\u7ed3\u679c\u3002\u7cbe\u786e\uff0c\u65e2\u80fd\u8ba9\u7cfb\u7edf\u4fdd\u6301\u53ef\u8bfb\uff0c\u4e5f\u80fd\u8ba9\u4f60\u81ea\u5df1\u7684\u63a8\u7406\u4fdd\u6301\u8bda\u5b9e\u3002<\/p>\n<h2><strong>\u7ed3\u8bba<\/strong><\/h2>\n<p>\u5f53\u670d\u52a1\u5668\u884c\u4e3a\u660e\u663e\u5f02\u5e38\uff0c\u4f46\u5b8f\u89c2\u6307\u6807\u5374\u6a21\u7cca\u4e0d\u6e05\u65f6\uff0cftrace \u63d0\u4f9b\u4e86\u4e00\u79cd\u76f4\u63a5\u68c0\u67e5\u5185\u6838\u51fd\u6570\u5ef6\u8fdf\u7684\u65b9\u6cd5\u3002\u901a\u8fc7\u8c28\u614e\u4f7f\u7528 tracefs\u3001\u4f18\u5148\u9009\u62e9 <code>function_graph<\/code> \u8fdb\u884c\u65f6\u957f\u5206\u6790\uff0c\u5e76\u5c06\u91c7\u96c6\u8303\u56f4\u9650\u5236\u5728\u53ef\u7591\u8def\u5f84\u4e0a\uff0c\u4f60\u5c31\u80fd\u591f\u4ece\u201c\u731c\u6d4b\u201d\u8d70\u5411\u201c\u8bc1\u636e\u201d\u3002\u5bf9\u4e8e\u8d1f\u8d23\u670d\u52a1\u5668\u79df\u7528\u6027\u80fd\u3001\u5608\u6742\u591a\u79df\u6237\u73af\u5883\uff0c\u6216\u5ef6\u8fdf\u654f\u611f\u8ba1\u7b97\u8282\u70b9\u7684\u56e2\u961f\u6765\u8bf4\uff0c\u8fd9\u79cd\u8ffd\u8e2a\u65b9\u5f0f\u7684\u4ef7\u503c\uff0c\u4e0d\u5728\u4e8e\u6536\u96c6\u66f4\u591a\u6570\u636e\uff0c\u800c\u5728\u4e8e\u5728\u6070\u5f53\u65f6\u673a\u6536\u96c6\u5230\u6b63\u786e\u7684\u5185\u6838\u6545\u4e8b\u3002\u8fd9\u4e5f\u6b63\u662f\u4e3a\u4ec0\u4e48 ftrace \u4f9d\u7136\u662f\u4e25\u8083 Linux \u8c03\u8bd5\u4e2d\u5982\u6b64\u5b9e\u7528\u7684\u5de5\u5177\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f53\u4e00\u53f0 Linux \u7cfb\u7edf\u8ba9\u4eba\u611f\u89c9\u201c\u53d8\u6162\u4e86\u201d\uff0c\u4f46\u5e38\u89c1\u76d1\u63a7\u56fe\u8868\u770b\u8d77\u6765\u5374\u5e76\u65e0\u5f02\u5e38\u65f6\uff0c\u771f\u6b63\u7f3a\u5931\u7684\u4fe1\u53f7\u5f80\u5f80\u57cb\u85cf\u5728\u7528\u6237\u6001\u4e4b\u4e0b\u3002\u8fd9\u65f6\uff0cftrace \u5c31\u663e\u5f97\u5c24\u4e3a\u6709\u7528\u3002\u5bf9\u4e8e\u8d1f\u8d23\u670d\u52a1\u5668\u79df\u7528\u57fa\u7840\u8bbe\u65bd\u3001\u5e95\u5c42\u5e73\u53f0\uff0c\u6216\u5bf9\u5ef6\u8fdf\u9ad8\u5ea6\u654f\u611f\u670d\u52a1\u7684\u5de5\u7a0b\u5e08\u800c\u8a00\uff0cftrace \u80fd\u63ed\u793a\u5185\u6838\u7a76\u7adf\u5982\u4f55\u8d70\u8fc7\u4e00\u6761\u4ee3\u7801\u8def\u5f84\u3001\u65f6\u95f4\u6d88\u8017\u5728\u4f55\u5904\uff0c\u4ee5\u53ca\u5ef6\u8fdf\u7a76\u7adf\u6765\u81ea\u8c03\u5ea6\u3001\u4e2d\u65ad\u3001\u6587\u4ef6\u64cd\u4f5c\uff0c\u8fd8\u662f\u7f51\u7edc\u5904\u7406\u3002\u4e0e\u5176\u6839\u636e\u8868\u9762\u75c7\u72b6\u731c\u6d4b\uff0c\u4e0d\u5982\u8d34\u8fd1\u5e95\u5c42\u53bb\u89c2\u5bdf\u6267\u884c\u6d41\u7a0b\uff0c\u5e76\u5bf9\u673a\u5668\u5b9e\u9645\u5728\u505a\u4ec0\u4e48\u5efa\u7acb\u4e00\u4e2a\u7cbe\u786e\u7684\u5224\u65ad\u3002 \u4e3a\u4ec0\u4e48 ftrace \u5bf9\u5185\u6838\u5ef6\u8fdf\u5206\u6790\u5982\u6b64\u91cd\u8981 ftrace \u5185\u7f6e\u4e8e Linux \u5185\u6838\u8ffd\u8e2a\u4f53\u7cfb\u4e2d\uff0c\u4e13\u95e8\u7528\u4e8e\u901a\u8fc7 tracefs \u76f4\u63a5\u89c2\u5bdf\u5185\u6838\u884c\u4e3a\u3002\u5185\u6838\u6587\u6863\u5c06\u5b83\u63cf\u8ff0\u4e3a\u4e00\u4e2a\u6846\u67b6\uff0c\u800c\u975e\u5355\u4e00\u8ffd\u8e2a\u5668\uff1b\u5b83\u652f\u6301\u51fd\u6570\u8ffd\u8e2a\u3001\u51fd\u6570\u56fe\u8ffd\u8e2a\u3001\u4e8b\u4ef6\u8ffd\u8e2a\u4ee5\u53ca\u9762\u5411\u5ef6\u8fdf\u5206\u6790\u7684\u8ffd\u8e2a\u6a21\u5f0f\u3002\u73b0\u4ee3\u7cfb\u7edf\u901a\u5e38\u4f1a\u5728 \/sys\/kernel\/tracing \u4e0b\u66b4\u9732\u63a7\u5236\u6587\u4ef6\uff0c\u800c\u8f83\u65e7\u7684\u5e03\u5c40\u5219\u53ef\u80fd\u4ecd\u901a\u8fc7\u8c03\u8bd5\u8def\u5f84\u63d0\u4f9b\u517c\u5bb9\u652f\u6301\u3002\u5b9e\u9645\u610f\u4e49\u5f88\u76f4\u63a5\uff1a\u5982\u679c\u4f60\u9700\u8981\u68c0\u67e5\u5185\u6838\u4fa7\u7684\u5ef6\u8fdf\u95ee\u9898\uff0cftrace \u5f80\u5f80\u5df2\u7ecf\u5b58\u5728\u4e8e\u8bb8\u591a\u670d\u52a1\u5668\u73af\u5883\u4e2d\u3002 \u5b83\u7279\u522b\u6709\u5438\u5f15\u529b\u7684\u4e00\u70b9\uff0c\u5728\u4e8e\u80fd\u591f\u805a\u7126\u4e8e\u8c03\u7528\u8def\u5f84\uff0c\u800c\u4e0d\u662f\u505c\u7559\u5728\u5bbd\u6cdb\u7684\u5e73\u5747\u503c\u5c42\u9762\u3002\u901a\u7528\u76d1\u63a7\u5de5\u5177\u53ef\u4ee5\u544a\u8bc9\u4f60\u54cd\u5e94\u65f6\u95f4\u4e0d\u7a33\u5b9a\uff0c\u4f46 ftrace \u80fd\u8fdb\u4e00\u6b65\u5c55\u793a\uff1a\u67d0\u4e2a\u8bf7\u6c42\u8fdb\u5165\u4e86\u4e00\u4e2a\u5185\u6838\u8def\u5f84\uff0c\u8c03\u7528\u4e86\u7279\u5b9a\u51fd\u6570\uff0c\u7ee7\u7eed\u6df1\u5165\u5230\u66f4\u6df1\u7684\u5206\u652f\uff0c\u6700\u7ec8\u8fd4\u56de\u65f6\u5374\u6bd4\u9884\u671f\u66f4\u6162\u3002\u5bf9\u4e8e\u90a3\u4e9b\u95f4\u6b47\u6027\u51fa\u73b0\u3001\u8303\u56f4\u5f88\u7a84\u3001\u53c8\u96be\u4ee5\u901a\u8fc7\u7c97\u7c92\u5ea6\u6027\u80fd\u5206\u6790\u5b9a\u4f4d\u7684\u95ee\u9898\uff0c\u8fd9\u79cd\u53ef\u89c1\u6027\u6781\u5177\u4ef7\u503c\u3002 \u5b83\u53ef\u4ee5\u5728\u51fd\u6570\u8fdb\u5165\u65f6\u8ffd\u8e2a\u5185\u6838\u51fd\u6570\uff0c\u800c\u5728\u56fe\u6a21\u5f0f\u4e0b\u8fd8\u80fd\u8bb0\u5f55\u51fd\u6570\u9000\u51fa\u3002 \u5b83\u6709\u52a9\u4e8e\u5b9a\u4f4d\u5ef6\u8fdf\u4ece\u54ea\u91cc\u5f00\u59cb\uff0c\u800c\u4e0d\u53ea\u662f\u5ef6\u8fdf\u6700\u7ec8\u5728\u54ea\u91cc\u88ab\u89c2\u5bdf\u5230\u3002 \u5b83\u5c24\u5176\u64c5\u957f\u8c03\u8bd5\u8be1\u5f02\u7684\u6296\u52a8\u95ee\u9898\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u660e\u663e\u7684\u541e\u5410\u5d29\u584c\u3002 \u5b83\u53ef\u4ee5\u901a\u8fc7\u7b5b\u9009\u76ee\u6807\u51fd\u6570\u6765\u6536\u7a84\u8303\u56f4\uff0c\u4ece\u800c\u8ba9\u8ffd\u8e2a\u7ed3\u679c\u4fdd\u6301\u53ef\u8bfb\u3002 \u54ea\u4e9b\u670d\u52a1\u5668\u573a\u666f\u6700\u9002\u5408\u4f7f\u7528 ftrace \u5185\u6838\u8ffd\u8e2a\u5e76\u4e0d\u662f\u4eea\u8868\u76d8\u4e00\u53d8\u7ea2\u5c31\u5e94\u8be5\u7acb\u523b\u5f00\u542f\u7684\u5de5\u5177\u3002\u5b83\u6700\u6709\u4ef7\u503c\u7684\u573a\u666f\uff0c\u662f\u7cfb\u7edf\u51fa\u73b0\u4e86\u7528\u6237\u771f\u5b9e\u53ef\u611f\u77e5\u3001\u4f46\u5bf9\u5e38\u89c4\u5de5\u5177\u6765\u8bf4\u53c8\u76f8\u5f53\u6a21\u7cca\u7684\u5f02\u5e38\u3002\u6700\u5e38\u89c1\u7684\u6a21\u5f0f\u662f\uff1a\u5e94\u7528\u65e5\u5fd7\u663e\u793a\u5b58\u5728\u5361\u987f\uff0c\u53ef CPU \u4f7f\u7528\u7387\u3001\u5185\u5b58\u538b\u529b\u548c\u5b58\u50a8\u6307\u6807\u5374\u65e0\u6cd5\u5145\u5206\u89e3\u91ca\u95ee\u9898\u3002 \u8bf7\u6c42\u8def\u5f84\u6296\u52a8\uff1a\u5e76\u53d1\u4e0a\u6765\u540e\u5ef6\u8fdf\u7a81\u589e\uff0c\u4f46\u5de5\u4f5c\u8fdb\u7a0b\u5e76\u6ca1\u6709\u8868\u73b0\u51fa\u7a33\u5b9a\u7684\u7528\u6237\u6001\u70ed\u70b9\u3002 I\/O \u5361\u987f\uff1a\u8bfb\u5199\u8def\u5f84\u5076\u53d1\u6027\u505c\u987f\uff0c\u8db3\u4ee5\u62c9\u9ad8\u5c3e\u5ef6\u8fdf\uff0c\u800c\u961f\u5217\u89c6\u56fe\u770b\u8d77\u6765\u5374\u5e76\u4e0d\u5938\u5f20\u3002 \u7f51\u7edc\u5904\u7406\u5ef6\u8fdf\uff1a\u6570\u636e\u5305\u5df2\u7ecf\u5230\u8fbe\uff0c\u4f46\u5728\u534f\u8bae\u6808\u4e2d\u7684\u5904\u7406\u4f3c\u4e4e\u5ffd\u5feb\u5ffd\u6162\u3002 \u8c03\u5ea6\u5f02\u5e38\uff1a\u7ebf\u7a0b\u5df2\u7ecf\u88ab\u5524\u9192\uff0c\u5374\u6ca1\u6709\u5728\u9884\u671f\u65f6\u95f4\u5185\u771f\u6b63\u8fd0\u884c\u3002 \u4e2d\u65ad\u76f8\u5173\u5e72\u6270\uff1a\u7cfb\u7edf\u51fa\u73b0\u6210\u7c07\u7684\u65f6\u95f4\u566a\u58f0\uff0c\u6697\u793a\u4e2d\u65ad\u88ab\u5173\u95ed\u8fc7\u4e45\u6216\u5904\u7406\u88ab\u5ef6\u540e\u3002 \u5728\u8fd9\u4e9b\u573a\u666f\u4e2d\uff0cftrace 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