linux-kernel - Re: [PATCH] perf record: mmap output file

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Message-ID: <524478F2.8040609@gmail.com>
Date:	Thu, 26 Sep 2013 12:12:02 -0600
From:	David Ahern <dsahern@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	acme@...stprotocols.net, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mike Galbraith <efault@....de>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf record: mmap output file - RFC

On 9/26/13 11:51 AM, Jiri Olsa wrote:
> but it's still faster, since we finally get perf a chance to sleep ;-)
>
> new time:
> 	real    0m30.392s
> 	user    0m0.041s
> 	sys     0m0.389s
>
> old time:
> 	real    0m32.235s
> 	user    0m3.080s
> 	sys     0m14.444s

excellent.

>
>
>> [ perf record: Captured and wrote 8.203 MB /tmp/perf.data (~358388 samples) ]
>>
>> Before I get too far down this path I wanted to get comments on the approach.
>
> I think it's worthwhile doing this

If you can toss it onto your queue to run through it other use cases -- 
like the 'make -j' on kernel builds. I am doing the same here and if all 
goes well I submit with some other patches next week.

Thanks,

David
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