Re: [PATCH] perf trace: Tweak summary output

From: Ingo Molnar
Date: Wed Nov 13 2013 - 07:57:42 EST



* Pekka Enberg <penberg@xxxxxxxxxx> wrote:

> Tweak the summary output as suggested by Ingo Molnar:
>
> [penberg@localhost ~]$ perf trace -a --duration 10000 --summary -- sleep 1
> ^C
> Summary of events:
>
> Xorg (817), 148 events, 0.0%, 0.000 msec
>
> syscall calls min avg max stddev
> (msec) (msec) (msec) (%)
> --------------- -------- --------- --------- --------- ------
> read 7 0.002 0.004 0.011 32.00%
> rt_sigprocmask 40 0.001 0.001 0.002 1.31%
> ioctl 6 0.002 0.003 0.005 19.45%
> writev 7 0.004 0.018 0.059 43.76%
> select 9 0.000 74.513 507.869 74.61%
> setitimer 4 0.001 0.002 0.002 10.08%

Acked-by: Ingo Molnar <mingo@xxxxxxxxxx>

Are you convinced about double-digit precision output for percentages?

I think it suggest a false level of accuracy, but YYMV - typographically
xx.yy certainly looks nicer than xx.y (it's more symmetric).

Thanks,

Ingo
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