perf trace跟踪系统调用
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perf trace跟踪系统调用
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perf trace -p $pid --duration 50
命令輸出如下：
0.076 (1249.922 ms): epoll_wait(epfd: 4<anon_inode:[eventpoll]>, events: 0x7ffe92ab3af0, maxevents: 36, timeout: 4294967295) = 11250.074 (1249.927 ms): epoll_wait(epfd: 4<anon_inode:[eventpoll]>, events: 0x7ffe92ab3af0, maxevents: 36, timeout: 4294967295) = 12500.076 (1249.924 ms): epoll_wait(epfd: 4<anon_inode:[eventpoll]>, events: 0x7ffe92ab3af0, maxevents: 36, timeout: 4294967295) = 1 perf trace -p $pid --duration 50 --call-graph dwarf -o savefile.txt命令輸出如下：
0.409 (1249.593 ms): epoll_wait(epfd: 4<anon_inode:[eventpoll]>, events: 0x7ffe92ab3af0, maxevents: 36, timeout: 4294967295) = 1[0xffff80d79646ceb3] (/usr/lib64/libc-2.17.so)[0xffffaa31d86cf058] (/usr/lib/systemd/systemd)[0xffffaa31d86cfb6c] (/usr/lib/systemd/systemd)[0xffffaa31d862db82] (/usr/lib/systemd/systemd)[0xffffaa31d8621f27] (/usr/lib/systemd/systemd)__libc_start_main (/usr/lib64/libc-2.17.so)[0xffffaa31d8623f8b] (/usr/lib/systemd/systemd)總結(jié)
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