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Subject: Re: [RFC PATCH 2/2] perf stat: Use event group to simulate PMI on
 PMI-less hardware counter
From: Peter Zijlstra <peterz@infradead.org>
To: Lin Ming <ming.m.lin@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>, Matt Fleming <matt@console-pimps.org>,
        "Zhang, Rui" <rui.zhang@intel.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        lkml <linux-kernel@vger.kernel.org>,
        Arnaldo Carvalho de Melo <acme@redhat.com>
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Date: Wed, 10 Nov 2010 16:08:43 +0100
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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.