Perf性能统计

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针对某个进程做perf统计：

perf record -e cpu-clock -p [pid] -g

[ perf record: Woken up 95 times to write data ][ perf record: Captured and wrote 23.788 MB perf.data (~1039333 samples) ]

查看统计结果：

perf report -g

Samples: 188K of event 'cpu-clock', Event count (approx.): 47241750000                                                                                       +   5.17%  xxxd  [kernel.kallsyms]          [k] SYSC_semtimedop                                                                                            ++   4.58%  xxxd  [kernel.kallsyms]          [k] system_call_after_swapgs                                                                                   :+   3.40%  xxxd  libc-2.17.so               [.] __GI___semop                                                                                               :+   3.40%  xxxd  [kernel.kallsyms]          [k] copy_user_enhanced_fast_string                                                                             :+   3.37%  xxxd  libxxx_x86.so.1  [.] shmem_hashtbl_find+ ……

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