\u6027\u80fd\u95ee\u9898\u7684\u6392\u67e5\u9075\u5faa\u4e00\u4e2a\u7ecf\u5178\u7684\u4e09\u5c42\u6a21\u578b\u3002\u7b2c\u4e00\u5c42\u662f"\u4fe1\u53f7\u5c42"\u2014\u2014\u770b\u5230\u7cfb\u7edf\u6307\u6807\u5f02\u5e38：CPU\u5229\u7528\u7387\u7a81\u7136\u98d9\u5230100%\u3001\u78c1\u76d8IO\u5ef6\u8fdf\u4ece2ms\u8df3\u5230200ms\u3001\u5185\u5b58OOM Killer\u89e6\u53d1\u3002\u7b2c\u4e8c\u5c42\u662f"\u5206\u6790\u5c42"\u2014\u2014\u9700\u8981\u5b9a\u4f4d\u5230\u5177\u4f53\u662f\u54ea\u4e2a\u8fdb\u7a0b\u3001\u54ea\u6bb5\u4ee3\u7801\u3001\u54ea\u4e2a\u51fd\u6570\u8c03\u7528\u5bfc\u81f4\u7684\u3002\u7b2c\u4e09\u5c42\u662f"\u4fee\u590d\u5c42"\u2014\u2014\u7406\u89e3\u6839\u56e0\u540e\u4fee\u6539\u4ee3\u7801\u6216\u914d\u7f6e\u3002<\/p>\n
\u95ee\u9898\u5728\u4e8e\u591a\u6570\u5de5\u7a0b\u5e08\u7684\u6392\u67e5\u8def\u5f84\u662f\u4ece\u76d1\u63a7\u9762\u677f\u8df3\u8fdb\u5e94\u7528\u65e5\u5fd7，\u7136\u540e\u9677\u5165"\u52a0\u65e5\u5fd7\u2192\u91cd\u65b0\u90e8\u7f72\u2192\u89c2\u5bdf\u2192\u518d\u52a0\u65e5\u5fd7"\u7684\u5faa\u73af\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u6548\u7387\u6781\u4f4e，\u800c\u4e14\u5bf9\u5185\u6838\u7ea7\u522b\u7684\u6027\u80fd\u95ee\u9898（\u5982\u4e0a\u4e0b\u6587\u5207\u6362\u98ce\u66b4\u3001\u7f3a\u9875\u5f02\u5e38\u3001\u81ea\u65cb\u9501\u4e89\u7528）\u5b8c\u5168\u65e0\u529b\u3002<\/p>\n
Linux\u5185\u6838\u63d0\u4f9b\u4e86\u4e09\u4e2a\u6838\u5fc3\u6280\u672f\u89e3\u51b3\u5206\u6790\u5c42\u7684\u9700\u6c42：ftrace\u3001perf\u548ceBPF\u3002\u5b83\u4eec\u5404\u6709\u4e13\u957f，\u4e5f\u5404\u6709\u76f2\u533a\u3002<\/p>\n
flowchart TB
\n subgraph \u4fe1\u53f7\u5c42
\n S1[Prometheus\/Grafana]
\n S2[CPU\u4f7f\u7528\u7387\u98d9\u5347]
\n S3[\u5185\u5b58OOM]
\n S4[IO\u5ef6\u8fdf\u5f02\u5e38]
\n end<\/p>\n
subgraph \u5206\u6790\u5c42
\n A1[ftrace<br\/>\u51fd\u6570\u8ffd\u8e2a\/\u5ef6\u8fdf\u5206\u6790]
\n A2[perf<br\/>\u91c7\u6837\u5256\u6790\/PMU\u8ba1\u6570]
\n A3[eBPF<br\/>\u52a8\u6001\u63d2\u6869\/\u53ef\u7f16\u7a0b\u8ffd\u8e2a]
\n end<\/p>\n
subgraph \u4fee\u590d\u5c42
\n R1[\u4ee3\u7801\u4f18\u5316]
\n R2[\u914d\u7f6e\u8c03\u4f18]
\n R3[\u67b6\u6784\u8c03\u6574]
\n end<\/p>\n
S2 –> A1
\n S3 –> A2
\n S4 –> A3
\n A1 –> R1
\n A2 –> R2
\n A3 –> R3<\/p>\n
style A1 fill:#4CAF50,color:#fff
\n style A2 fill:#2196F3,color:#fff
\n style A3 fill:#FF9800,color:#fff<\/p>\n
ftrace\u662f\u5185\u6838\u5185\u7f6e\u7684\u8ffd\u8e2a\u6846\u67b6，\u5176\u8bbe\u8ba1\u54f2\u5b66\u662f"\u6700\u5c0f\u4fb5\u5165\u6027"\u3002\u5b83\u901a\u8fc7\u5728\u5185\u6838\u7f16\u8bd1\u65f6\u5728\u51fd\u6570\u5165\u53e3\u5904\u63d2\u5165mcount\/fentry\u8c03\u7528\u70b9，\u8fd0\u884c\u65f6\u7531ftrace\u52a8\u6001\u66ff\u6362\u8fd9\u4e9b\u8c03\u7528\u70b9\u4e3anop（\u4e0d\u8ffd\u8e2a\u65f6）\u6216ftrace\u7684\u5904\u7406\u51fd\u6570（\u8ffd\u8e2a\u65f6）\u3002\u8fd9\u610f\u5473\u7740\u5173\u95edftrace\u65f6\u6027\u80fd\u5f00\u9500\u4e3a\u96f6\u3002<\/p>\n
ftrace\u6700\u5b9e\u7528\u7684\u4e09\u4e2a\u5b50\u529f\u80fd\u662ffunction tracer\u3001function graph tracer\u548ctrace events\u3002<\/p>\n
function tracer\u8ffd\u8e2a\u51fd\u6570\u8c03\u7528\u3002\u7528\u6cd5\u975e\u5e38\u7b80\u5355：<\/p>\n
echo function > \/sys\/kernel\/debug\/tracing\/current_tracer
\necho "tcp_sendmsg" > \/sys\/kernel\/debug\/tracing\/set_ftrace_filter
\ncat \/sys\/kernel\/debug\/tracing\/trace
\n# \u8f93\u51fa:
\n# kworker-123 [001] … 12345.678: tcp_sendmsg <-sock_sendmsg<\/p>\n
function graph tracer\u6bd4function tracer\u591a\u663e\u793a\u51fd\u6570\u8fd4\u56de\u70b9\u548c\u6267\u884c\u65f6\u957f，\u5bf9\u4e8e\u5206\u6790"\u54ea\u4e2a\u5b50\u51fd\u6570\u6d88\u8017\u4e86\u6700\u591a\u65f6\u95f4"\u7279\u522b\u6709\u6548\u3002<\/p>\n
echo function_graph > \/sys\/kernel\/debug\/tracing\/current_tracer
\necho "ext4_file_write_iter" > \/sys\/kernel\/debug\/tracing\/set_graph_function
\ncat \/sys\/kernel\/debug\/tracing\/trace<\/p>\n
trace events\u662fftrace\u6700\u5f3a\u5927\u7684\u90e8\u5206\u2014\u2014\u5185\u6838\u5728\u5173\u952e\u8def\u5f84\u57cb\u8bbe\u4e86\u51e0\u5343\u4e2a\u9759\u6001tracepoint\u3002\u8c03\u5ea6\u5668\u3001\u7f51\u7edc\u6808\u3001\u6587\u4ef6\u7cfb\u7edf\u3001\u5757\u8bbe\u5907\u9a71\u52a8\u90fd\u6709\u5404\u81ea\u7684tracepoint\u3002\u901a\u8fc7tracepoint，\u53ef\u4ee5\u96f6\u4fb5\u5165\u5730\u89c2\u6d4b\u5185\u6838\u7684\u884c\u4e3a：<\/p>\n
# \u8ffd\u8e2a\u6240\u6709TCP\u91cd\u4f20\u4e8b\u4ef6
\necho 1 > \/sys\/kernel\/debug\/tracing\/events\/tcp\/tcp_retransmit_skb\/enable
\ncat \/sys\/kernel\/debug\/tracing\/trace_pipe<\/p>\n
ftrace\u7684\u5c40\u9650\u6027\u5728\u4e8e\u5b83\u662f\u5185\u6838\u8ffd\u8e2a\u6846\u67b6，\u7528\u6237\u6001\u8fdb\u7a0b\u7684\u4e0a\u4e0b\u6587\u4fe1\u606f\u6709\u9650\u3002\u800c\u4e14ftrace\u7684\u8f93\u51fa\u662f\u539f\u59cb\u6587\u672c，\u9700\u8981\u914d\u5408\u5de5\u5177（\u5982trace-cmd\u3001Kernelshark）\u505a\u53ef\u89c6\u5316\u548c\u5206\u6790\u3002\u5bf9\u4e8e\u590d\u6742\u7684\u6027\u80fd\u5206\u6790\u573a\u666f，ftrace\u66f4\u9002\u5408\u4f5c\u4e3a"\u786e\u8ba4\u6000\u7591\u65b9\u5411"\u7684\u521d\u6b65\u5de5\u5177，\u800c\u975e\u6df1\u5ea6\u5256\u6790\u7684\u4e3b\u8981\u6b66\u5668\u3002<\/p>\n
perf\u5efa\u7acb\u5728CPU\u7684\u786c\u4ef6\u6027\u80fd\u8ba1\u6570\u5668（PMU，Performance Monitoring Unit）\u4e4b\u4e0a\u3002\u73b0\u4ee3CPU（Intel\/AMD\/ARM）\u90fd\u5185\u7f6e\u4e86PMU，\u53ef\u4ee5\u8ba1\u6570\u7f13\u5b58\u672a\u547d\u4e2d\u3001\u5206\u652f\u9884\u6d4b\u5931\u8d25\u3001\u6307\u4ee4\u6267\u884c\u6570\u7b49\u5fae\u89c2\u4e8b\u4ef6\u3002perf\u901a\u8fc7\u91c7\u6837（Sampling）\u65b9\u5f0f：\u4ee5\u56fa\u5b9a\u9891\u7387（\u9ed8\u8ba44000Hz）\u89e6\u53d1\u4e2d\u65ad，\u8bb0\u5f55\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684\u6307\u4ee4\u5730\u5740\u548c\u8c03\u7528\u6808，\u65e0\u9700\u4fee\u6539\u4efb\u4f55\u4ee3\u7801\u3002<\/p>\n
perf\u6700\u6838\u5fc3\u7684\u4e09\u4e2a\u547d\u4ee4：perf stat（\u8ba1\u6570）\u3001perf record（\u91c7\u6837\u8bb0\u5f55）\u3001perf report（\u62a5\u544a\u5206\u6790）\u3002<\/p>\n
perf stat\u56de\u7b54"\u8fd9\u6bb5\u7a0b\u5e8f\u5728CPU\u4e0a\u53d1\u751f\u4e86\u4ec0\u4e48"：<\/p>\n
perf stat -e cycles,instructions,cache-misses,branch-misses — .\/myapp
\n# \u8f93\u51fa：
\n# 1,234,567,890 cycles
\n# 987,654,321 instructions # 0.80 insn per cycle
\n# 12,345,678 cache-misses # 15.2% of all cache refs
\n# 1,234,567 branch-misses # 2.34% of all branches<\/p>\n
IPC（\u6bcf\u5468\u671f\u6307\u4ee4\u6570）\u5c0f\u4e8e1\u8bf4\u660e\u7a0b\u5e8f\u53d7\u5185\u5b58\u5ef6\u8fdf\u7ea6\u675f（Memory Bound），\u4f18\u5316\u65b9\u5411\u5e94\u8be5\u653e\u5728\u51cf\u5c11\u7f13\u5b58\u672a\u547d\u4e2d\u4e0a\u3002\u7f13\u5b58\u672a\u547d\u4e2d\u7387\u8d85\u8fc710%\u5c31\u9700\u8981\u5173\u6ce8\u6570\u636e\u7ed3\u6784\u7684\u5c40\u90e8\u6027\u3002<\/p>\n
perf record + report\u751f\u6210\u706b\u7130\u56fe\u7ea7\u522b\u7684\u8c03\u7528\u6808\u5206\u6790：<\/p>\n
# \u91c7\u683710\u79d2，\u8bb0\u5f55\u8c03\u7528\u6808（-g）
\nperf record -g -p $(pidof mysqld) — sleep 10
\nperf report –stdio<\/p>\n
# \u751f\u6210\u706b\u7130\u56fe
\nperf script | stackcollapse-perf.pl | flamegraph.pl > flame.svg<\/p>\n
\u70ed\u70b9\u7684\u67e5\u627e\u6bd4\u60f3\u8c61\u4e2d\u66f4\u4f9d\u8d56\u7ecf\u9a8c\u3002\u4e00\u4e2a\u5e38\u89c1\u9677\u9631\u662f\u628a"\u91c7\u6837\u6570\u6700\u591a\u7684\u51fd\u6570"\u7b49\u540c\u4e8e"\u9700\u8981\u4f18\u5316\u7684\u51fd\u6570"\u3002\u5185\u6838\u4e2d\u7684copy_user_enhanced_fast_string（\u7528\u6237\u6001\u5185\u5b58\u62f7\u8d1d）\u901a\u5e38\u91c7\u6837\u6570\u5f88\u9ad8，\u4f46\u5b83\u662f\u5fc5\u8981\u7684\u5f00\u9500，\u4f18\u5316\u8981\u5f80\u4e0a\u6e38\u627e\u662f\u8c01\u9891\u7e41\u8c03\u7528\u4e86\u5b83\u3002<\/p>\n
perf\u7684\u4e3b\u8981\u5f31\u70b9\u662f\u5bf9\u52a8\u6001\u884c\u4e3a（\u5982\u6709\u6761\u4ef6\u7684\u9501\u4e89\u7528）\u4e0d\u591f\u7075\u654f\u3002\u91c7\u6837\u53ea\u80fd\u6355\u83b7\u91c7\u6837\u77ac\u95f4\u7684\u72b6\u6001，\u5982\u679c\u67d0\u4e2a\u9501\u53ea\u5728\u7279\u5b9a\u4e1a\u52a1\u5cf0\u8c37\u4ea4\u66ff\u65f6\u77ed\u6682\u4e89\u7528，perf\u5927\u6982\u7387\u91c7\u4e0d\u5230\u3002\u8fd9\u5c31\u662feBPF\u5927\u663e\u8eab\u624b\u7684\u573a\u666f\u3002<\/p>\n
eBPF（extended Berkeley Packet Filter）\u662f\u6027\u80fd\u89c2\u6d4b\u9886\u57df\u771f\u6b63\u7684\u8303\u5f0f\u8f6c\u53d8\u3002\u5b83\u5141\u8bb8\u4f60\u5728\u5185\u6838\u4e2d\u8fd0\u884c\u6c99\u7bb1\u5316\u7684\u7a0b\u5e8f，\u52a8\u6001\u63d2\u6869\u4efb\u610f\u5185\u6838\u51fd\u6570\u3001\u7cfb\u7edf\u8c03\u7528\u3001tracepoint\u751a\u81f3\u7528\u6237\u6001\u51fd\u6570\u3002\u800c\u4e14eBPF\u7a0b\u5e8f\u662f\u4e8b\u4ef6\u9a71\u52a8\u7684，\u4e0d\u50cfperf\u90a3\u6837\u4f9d\u8d56\u91c7\u6837\u3002<\/p>\n
eBPF\u7684\u5de5\u4f5c\u6d41\u7a0b\u662f：\u7528\u6237\u6001\u7a0b\u5e8f（Python\/Go\/C）\u7f16\u5199eBPF\u7a0b\u5e8f\u6e90\u7801，\u7f16\u8bd1\u4e3aBPF\u5b57\u8282\u7801，\u901a\u8fc7bpf()\u7cfb\u7edf\u8c03\u7528\u52a0\u8f7d\u5230\u5185\u6838，\u5185\u6838\u9a8c\u8bc1\u5668（Verifier）\u68c0\u67e5\u5b89\u5168\u6027\u540eJIT\u7f16\u8bd1\u4e3a\u672c\u5730\u673a\u5668\u7801，\u6700\u540e\u6302\u8f7d\u5230\u6307\u5b9a\u7684\u94a9\u5b50\u70b9（kprobe\/tracepoint\/uprobe\u7b49）\u4e0a\u3002<\/p>\n
from bcc import BPF<\/p>\n
# \u8ffd\u8e2a\u6240\u6709\u8fdb\u7a0b\u7684exec\u7cfb\u7edf\u8c03\u7528，\u8bb0\u5f55\u8fdb\u7a0b\u540d\u548c\u53c2\u6570
\nbpf_code = """
\n#include <uapi\/linux\/ptrace.h>
\nBPF_HASH(execs, u32, u64);<\/p>\n
TRACEPOINT_PROBE(syscalls, sys_enter_execve) {
\n char comm[TASK_COMM_LEN];
\n bpf_get_current_comm(&comm, sizeof(comm));
\n bpf_trace_printk("exec: %s\\\\\\\\n", comm);
\n return 0;
\n}
\n"""
\nb = BPF(text=bpf_code)
\nb.trace_print()<\/p>\n
\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u6392\u67e5\u8fc7\u4e00\u4e2a\u7ecf\u5178\u7684eBPF\u6848\u4f8b：\u67d0\u5fae\u670d\u52a1P99\u5ef6\u8fdf\u5468\u671f\u6027\u98d9\u5347\u81f3500ms，perf\u91c7\u6837\u6ca1\u6709\u53d1\u73b0\u5f02\u5e38\u70ed\u70b9，ftrace\u6ca1\u6709\u5f02\u5e38\u7684\u51fd\u6570\u8017\u65f6\u3002\u901a\u8fc7eBPF\u5728schedule\u51fd\u6570\u4e0a\u6302\u8f7dkprobe，\u8bb0\u5f55\u8fdb\u7a0b\u88ab\u62a2\u5360\u65f6\u7684\u8c03\u7528\u6808\u548c\u7b49\u5f85\u65f6\u957f，\u6700\u7ec8\u5b9a\u4f4d\u5230\u662fcgroup\u7684CPU\u9650\u989d（CFS quota）\u5728\u4e1a\u52a1\u5cf0\u503c\u89e6\u53d1\u4e86throttle，\u5bfc\u81f4\u8fdb\u7a0b\u88ab\u5f3a\u5236\u505c\u752850ms\u3002<\/p>\n
\/\/ eBPF\u8ffd\u8e2amutex\u9501\u7b49\u5f85\u65f6\u95f4
\nBPF_HISTOGRAM(lock_wait_ns);<\/p>\n
int kprobe__mutex_lock(struct pt_regs *ctx) {
\n u64 ts = bpf_ktime_get_ns();
\n u32 tid = bpf_get_current_pid_tgid();
\n lock_start.update(&tid, &ts);
\n return 0;
\n}<\/p>\n
int kretprobe__mutex_lock(struct pt_regs *ctx) {
\n u32 tid = bpf_get_current_pid_tgid();
\n u64 *tsp = lock_start.lookup(&tid);
\n if (tsp) {
\n u64 delta = bpf_ktime_get_ns() – *tsp;
\n lock_wait_ns.increment(bpf_log2l(delta));
\n lock_start.delete(&tid);
\n }
\n return 0;
\n}<\/p>\n
eBPF\u7684\u5b66\u4e60\u66f2\u7ebf\u662f\u6700\u9661\u5ced\u7684\u3002\u4f60\u9700\u8981\u7406\u89e3\u5185\u6838\u6570\u636e\u7ed3\u6784\u7684\u5185\u5b58\u5e03\u5c40\u3001\u638c\u63e1C\u8bed\u8a00（eBPF\u7684C\u5b50\u96c6\u6709\u4e25\u683c\u9650\u5236）\u3001\u80fd\u770b\u61c2Verifier\u7684\u9519\u8bef\u4fe1\u606f\u3002\u4f46\u8fd9\u4e9b\u6295\u5165\u6362\u6765\u7684\u80fd\u529b\u662f\u4e0d\u53ef\u66ff\u4ee3\u7684：\u4f60\u53ef\u4ee5\u8ba9\u5185\u6838\u56de\u7b54\u4efb\u4f55\u5173\u4e8e\u81ea\u8eab\u884c\u4e3a\u7684\u95ee\u9898\u3002<\/p>\n
flowchart LR
\n subgraph \u9009\u62e9\u7b56\u7565
\n Q{\u6027\u80fd\u95ee\u9898\u7c7b\u578b?}
\n Q –>|\u51fd\u6570\u8017\u65f6\u5206\u5e03| F[ftrace<br\/>function_graph]
\n Q –>|CPU\/\u7f13\u5b58\u5fae\u89c2\u6307\u6807| P[perf<br\/>stat\/record]
\n Q –>|\u52a8\u6001\u884c\u4e3a\/\u6761\u4ef6\u8ffd\u8e2a| E[eBPF<br\/>kprobe\/tracepoint]
\n Q –>|I\/O\u5ef6\u8fdf\u5206\u6790| F
\n Q –>|\u9501\u4e89\u7528\u5206\u6790| E
\n Q –>|\u706b\u7130\u56fe\/\u70ed\u70b9\u5206\u6790| P
\n Q –>|\u7cfb\u7edf\u8c03\u7528\u8ffd\u8e2a| E
\n end<\/p>\n
subgraph \u534f\u540c\u4f7f\u7528
\n F –> R[\u7efc\u5408\u5206\u6790]
\n P –> R
\n E –> R
\n R –> S[\u5b9a\u4f4d\u6839\u56e0]
\n end<\/p>\n
style F fill:#4CAF50,color:#fff
\n style P fill:#2196F3,color:#fff
\n style E fill:#FF9800,color:#fff<\/p>\n
ftrace\u9002\u5408\u573a\u666f：\u51fd\u6570\u7ea7\u5ef6\u8fdf\u5206\u6790（\u54ea\u4e2a\u51fd\u6570\u6700\u6162）\u3001I\/O\u5ef6\u8fdf\u8ffd\u8e2a（\u914d\u5408trace events）\u3001\u8c03\u5ea6\u5668\u884c\u4e3a\u5206\u6790\u3002\u4f18\u52bf\u662f\u96f6\u914d\u7f6e（\u5185\u6838\u5185\u7f6e），\u52a3\u52bf\u662f\u7528\u6237\u6001\u4fe1\u606f\u6709\u9650\u3002<\/p>\n
perf\u9002\u5408\u573a\u666f：CPU\u70ed\u70b9\u5206\u6790（\u706b\u7130\u56fe）\u3001PMU\u5fae\u89c2\u6307\u6807（IPC\/\u7f13\u5b58\u547d\u4e2d\u7387）\u3001\u5927\u8303\u56f4\u6027\u80fd\u753b\u50cf\u3002\u4f18\u52bf\u662f\u91c7\u6837\u5f00\u9500\u6781\u4f4e（<1%），\u52a3\u52bf\u662f\u5bf9\u52a8\u6001\/\u6761\u4ef6\u884c\u4e3a\u4e0d\u654f\u611f\u3002<\/p>\n
eBPF\u9002\u5408\u573a\u666f：\u9501\u4e89\u7528\u5206\u6790\u3001\u6761\u4ef6\u89e6\u53d1\u8ffd\u8e2a\u3001\u5b9a\u5236\u5316\u6307\u6807\u7684\u5b9e\u65f6\u91c7\u96c6\u3001\u77ed\u65f6\u5f02\u5e38\u6392\u67e5\u3002\u4f18\u52bf\u662f\u7075\u6d3b\u6027\u65e0\u53ef\u6bd4\u62df\u3001\u4e8b\u4ef6\u9a71\u52a8\u4e0d\u4e22\u4fe1\u606f，\u52a3\u52bf\u662f\u5b66\u4e60\u66f2\u7ebf\u9661\u5ced\u3001\u9700\u8981\u8f83\u9ad8\u5185\u6838\u7248\u672c\u3002<\/p>\n
\u534f\u540c\u4f7f\u7528\u4e09\u90e8\u66f2：\u5148\u7528perf\u505a\u5168\u5c40\u753b\u50cf\u786e\u5b9a\u95ee\u9898\u7c7b\u522b，\u518d\u7528ftrace\u6df1\u5165\u53ef\u7591\u51fd\u6570\u770b\u5ef6\u8fdf\u5206\u5e03，\u6700\u540e\u7528eBPF\u9488\u5bf9\u5177\u4f53\u573a\u666f\u505a\u7cbe\u51c6\u8ffd\u8e2a\u3002\u4e09\u8005\u4e0d\u662f\u66ff\u4ee3\u5173\u7cfb，\u800c\u662f\u9010\u6b65\u6df1\u5165\u7684\u9012\u8fdb\u5173\u7cfb\u3002<\/p>\n
\u5de5\u5177\u94fe\u7248\u672c\u8981\u6c42：ftrace\u81ea2.6.27\u5185\u6838\u5373\u5185\u7f6e\u65e0\u7248\u672c\u95ee\u9898\u3002perf\u9700\u6ce8\u610f\u4e0e\u5185\u6838\u7248\u672c\u7684\u517c\u5bb9\u6027（perf\u5de5\u5177\u7248\u672c\u2265\u5185\u6838\u7248\u672c）\u3002eBPF\u8981\u6c42\u5185\u6838\u22654.9（\u57fa\u672c\u529f\u80fd）\u3001\u22655.4（CO-RE\u53ef\u79fb\u690d\u6027）\u6216\u22655.15（\u7a33\u5b9a\u751f\u4ea7\u4f7f\u7528），BCC\/bpftrace\u7b49\u524d\u7aef\u9700\u8981\u5bf9\u5e94\u4f9d\u8d56\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
ftrace\/perf\/eBPF：Linux\u6027\u80fd\u89c2\u6d4b\u5de5\u5177\u7684\u5bf9\u6bd4\u4e0e\u534f\u540c
\n\u4e00\u3001\u6027\u80fd\u89c2\u6d4b\u7684\u4e09\u5c42\u6a21\u578b\u4e0e\u5de5\u5177\u77e9\u9635
\n\u6027\u80fd\u95ee\u9898\u7684\u6392\u67e5\u9075\u5faa\u4e00\u4e2a\u7ecf\u5178\u7684\u4e09\u5c42\u6a21\u578b\u3002\u7b2c\u4e00\u5c42\u662f\\”\u4fe1\u53f7\u5c42\\”\u2014\u2014\u770b\u5230\u7cfb\u7edf\u6307\u6807\u5f02\u5e38：CPU\u5229\u7528\u7387\u7a81\u7136\u98d9\u5230100%\u3001\u78c1\u76d8IO\u5ef6\u8fdf\u4ece2ms\u8df3\u5230200ms\u3001\u5185\u5b58OOM Killer\u89e6\u53d1\u3002\u7b2c\u4e8c\u5c42\u662f\\”\u5206\u6790\u5c42\\”\u2014\u2014\u9700\u8981\u5b9a\u4f4d\u5230\u5177\u4f53\u662f\u54ea\u4e2a\u8fdb\u7a0b\u3001\u54ea\u6bb5\u4ee3\u7801\u3001\u54ea\u4e2a\u51fd\u6570\u8c03\u7528\u5bfc\u81f4\u7684\u3002\u7b2c\u4e09\u5c42\u662f\\”\u4fee\u590d\u5c42\\”\u2014\u2014\u7406\u89e3\u6839\u56e0\u540e\u4fee\u6539\u4ee3\u7801\u6216\u914d\u7f6e\u3002
\n\u95ee\u9898\u5728\u4e8e\u591a\u6570\u5de5\u7a0b\u5e08\u7684\u6392\u67e5\u8def\u5f84\u662f\u4ece\u76d1\u63a7\u9762\u677f\u8df3\u8fdb\u5e94<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[9152,58,219],"topic":[],"class_list":["post-85308","post","type-post","status-publish","format-standard","hentry","category-server","tag-9152","tag-linux","tag-219"],"yoast_head":"\n