linux-kernel - Re: [PATCH] perf trace: Tweak summary output

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Message-ID: <20131113125734.GA22140@gmail.com>
Date:	Wed, 13 Nov 2013 13:57:34 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH] perf trace: Tweak summary output


* Pekka Enberg <penberg@...nel.org> wrote:

> Tweak the summary output as suggested by Ingo Molnar:
> 
>   [penberg@...alhost ~]$ 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@...nel.org>

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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