linux-kernel - Re: [PATCH v2 1/2] perf tools: add event modifier to request exclusive PMU access

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Message-ID: <1350925708.2768.106.camel@twins>
Date:	Mon, 22 Oct 2012 19:08:28 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Andi Kleen <ak@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH v2 1/2] perf tools: add event modifier to request
 exclusive PMU access

On Mon, 2012-10-22 at 18:08 +0200, Stephane Eranian wrote:
> > I'm still wondering if the avg user really thinks 'instructions' is
> a
> > useful metric for other than obtaining ipc measurements.
> >
> Yeah, for many users CPI (or IPC) is a useful metric. 

Right but you don't get that using instruction sampling, right? Or you
need to pair it with a cycle count one way or another. And I don't
really see PDIST helping with that.
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