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

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Message-ID: <19083.61914.571806.395197@cargo.ozlabs.ibm.com>
Date:	Wed, 19 Aug 2009 22:36:42 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>,
	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

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?

Does this only apply to sampling counters?

Paul.
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