linux-kernel - Re: [PATCH 4/5] perf record: mmap output file

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Date:	Tue, 19 Nov 2013 07:54:43 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	David Ahern <dsahern@...il.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org, jolsa@...hat.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 4/5] perf record: mmap output file - v5


* Namhyung Kim <namhyung@...nel.org> wrote:

> > Well, with 1 khz sampling of a single threaded workload it's 8MB 
> > per second - that's 80 MB for 10 seconds profiling - not the end 
> > of the world.
> 
> We now use 4 khz sampling frequency by default, just FYI. :)

Yes, but if someone samples with 1 khz that's still plenty enough for 
a long enough run.

With 4k sampling you coul do 2.5 seconds of profiling and still have 
80 MB of data :-)

Thanks,

	Ingo
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