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

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Message-ID: <52829F4F.6070800@gmail.com>
Date:	Tue, 12 Nov 2013 14:36:15 -0700
From:	David Ahern <dsahern@...il.com>
To:	Ingo Molnar <mingo@...nel.org>, Pekka Enberg <penberg@...nel.org>
CC:	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

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.

David
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