linux-kernel - Re: [PATCH 0/4] perf: Teach perf tool to profile sleep times (v2)

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Date:	Thu, 09 Aug 2012 09:37:56 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Andrey Wagin <avagin@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH 0/4] perf: Teach perf tool to profile sleep times (v2)

On Wed, 8 Aug 2012 11:24:34 +0400, Andrey Wagin wrote:
> 2012/8/8 Namhyung Kim <namhyung@...nel.org>:
>> On Wed, 8 Aug 2012 09:02:18 +0400, Andrey Wagin wrote:
>>> 2012/8/8 Namhyung Kim <namhyung@...nel.org>:
>>>>>
>>>>> $ ./perf record -e sched:sched_stat_sleep -e sched:sched_switch \
>>>>>               -e sched:sched_process_exit -gP -o ~/perf.data.raw ~/foo
>>>
>>> Actually this string is not completed, because sched:sched_switch
>>> should be filtered by state.
>>>
>>>>> [ perf record: Woken up 1 times to write data ]
>>>>> [ perf record: Captured and wrote 0.015 MB /root/perf.data.raw (~661 samples) ]
>>>>> $ ./perf inject -v -s -i ~/perf.data.raw -o ~/perf.data
>>>>> $ ./perf report -i ~/perf.data
>>>>
>>>> The usage like this is too specific and hard to use IMHO. How about
>>>> putting it somehow into perf sched or new command?
>>>>
>>>> /me don't have an idea though. :-)
>>>>
>>>
>>> I'm going to add a script, so the usage will look like this:
>>> $ perf script record sched-stat -e sched:sched_stat_sleep <command>
>>> This command will collect sched_stat_* and proper sched_switch events
>>
>> ???  That means '-e sched:sched_stat_sleep' part can be removed from
>> command line, no?
>
> No. My method works for all kind of sched_stat_* events, so you need
> to specify an event type which should be traced.

Ok, so can it be like 'perf script record sched-stat -t sleep <command>'?

Thanks,
Namhyung
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