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

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Date:	Thu, 26 Sep 2013 20:23:34 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	David Ahern <dsahern@...il.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 Thu, Sep 26, 2013 at 12:12:02PM -0600, David Ahern wrote:
> 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.

ok, np

jirka
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