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Date: Wed, 10 Nov 2010 15:17:19 +0000
From: Matt Fleming <matt@console-pimps.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Lin Ming <ming.m.lin@intel.com>, Ingo Molnar <mingo@elte.hu>,
        "Zhang, Rui" <rui.zhang@intel.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        lkml <linux-kernel@vger.kernel.org>,
        Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: Re: [RFC PATCH 2/2] perf stat: Use event group to simulate PMI on
	PMI-less hardware counter
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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.