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

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Date:	Tue, 12 Nov 2013 22:40:45 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Pekka Enberg <penberg@...nel.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH] perf trace: Simplify '--summary' output


* David Ahern <dsahern@...il.com> wrote:

> On 11/12/13, 2:33 PM, Ingo Molnar wrote:
> >>>  Summary of events:
> >>>
> >>>  dbus-daemon (555), 10 events, 0.0%, 0.000 msec
> >>>
> >>>                                                     msec/call
> >>>    syscall            calls      min      avg      max stddev
> >>>    --------------- -------- -------- -------- -------- ------
> >>>    sendmsg                2    0.002    0.005    0.008  55.00
> >>>    recvmsg                2    0.002    0.003    0.005  44.00
> >>>    epoll_wait             1    0.000    0.000    0.000   0.00
> >In what units is stddev? Percentage? If yes then it might be useful to
> >output it as %. [and probably to restrict precision to a single digit,
> >standard deviations are rarely more accurate than 0.1%.]
> >
> 
> %. That was dropped in the recent output change.

So if you prefer unit-less lines that's defensible, perhaps output the 
unit somewhere else:

    syscall            calls     min      avg      max  stddev
                               (msec)   (msec)   (msec)    (%)
    --------------- -------- -------- -------- -------- ------
    sendmsg                2    0.002    0.005    0.008  55.00
    recvmsg                2    0.002    0.003    0.005  44.00
    epoll_wait             1    0.000    0.000    0.000   0.00

or so?

Thanks,

	Ingo
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