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

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Date:	Wed, 10 Nov 2010 15:17:19 +0000
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Lin Ming <ming.m.lin@...el.com>, Ingo Molnar <mingo@...e.hu>,
	"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, Nov 10, 2010 at 04:08:43PM +0100, Peter Zijlstra wrote:
> 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.

My work in progress is here,

http://git.kernel.org/?p=linux/kernel/git/mfleming/sh-2.6.git;a=commitdiff;h=68f95e18cec7b2bc6baf3731969f94b9c51c7a08

I'll try get this submitted by the beginning of next week.
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