linux-kernel - Re: [RFC PATCH 2/2] perf stat: Use event group to simulate PMI on PMI-less hardware counter

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Message-ID: <1289401723.2084.0.camel@laptop>
Date:	Wed, 10 Nov 2010 16:08:43 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Matt Fleming <matt@...sole-pimps.org>,
	"Zhang, Rui" <rui.zhang@...el.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [RFC PATCH 2/2] perf stat: Use event group to simulate PMI on
 PMI-less hardware counter

On Wed, 2010-11-10 at 23:06 +0800, Lin Ming wrote:
> > The proposed idea was to group with a software hrtimer-based event
> > and use the hrtimer's sample to read the hardware group sibling using
> > PERF_SAMPLE_READ.
> 
> So this is usefull in perf top/record on PMI-less counter?

Correct, Matt was implementing this.
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