On 2/17/15 1:20 AM, Andrey Vagin wrote:
And here are statistics about syscalls which were called by each
command.
$ perf stat -e syscalls:sys_exit* -- ps ax -o pid,ppid 2>&1 | grep syscalls | sort -n -r | head -n 5
20,713 syscalls:sys_exit_open
20,710 syscalls:sys_exit_close
20,708 syscalls:sys_exit_read
10,348 syscalls:sys_exit_newstat
31 syscalls:sys_exit_write
$ perf stat -e syscalls:sys_exit* -- ./task_diag_all 2>&1 | grep syscalls | sort -n -r | head -n 5
114 syscalls:sys_exit_recvfrom
49 syscalls:sys_exit_write
8 syscalls:sys_exit_mmap
4 syscalls:sys_exit_mprotect
3 syscalls:sys_exit_newfstat
'perf trace -s' gives the summary with stats.
e.g., perf trace -s -- ps ax -o pid,ppid
ps (23850), 3117 events, 99.3%, 0.000 msec
syscall calls min avg max stddev
(msec) (msec) (msec) (%)
--------------- -------- --------- --------- --------- ------
read 353 0.000 0.010 0.035 3.14%
write 166 0.006 0.012 0.045 3.03%
open 365 0.002 0.005 0.178 11.29%
close 354 0.001 0.002 0.024 3.57%
stat 170 0.002 0.007 0.662 52.99%
fstat 19 0.002 0.003 0.003 2.31%
lseek 2 0.003 0.003 0.003 6.49%
mmap 50 0.004 0.006 0.013 3.40%
...
--
To unsubscribe from this list: send the line "unsubscribe linux-api" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
