linux-kernel - Re: [PATCH 4/4][RFC] perf_counter: Allow sharing of output channels

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Date:	Wed, 19 Aug 2009 14:56:13 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org,
	stephane eranian <eranian@...glemail.com>
Subject: Re: [PATCH 4/4][RFC] perf_counter: Allow sharing of output channels


* Paul Mackerras <paulus@...ba.org> wrote:

> Peter Zijlstra writes:
> 
> > Provide the ability to configure a counter to send its output 
> > to another (already existing) counter's output stream.
> 
> What sort of thing might this be useful for?

To share the output buffer - say you have a number of tracepoint 
counters enabled and want a single (coherent) stream of events 
without a post-processing sorting pass.

Right now each counter has to be opened, mmap-ed separately and 
then the result stuffed into the output file.

	Ingo
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