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

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Message-ID: <CABPqkBQ26K9iT6Kkzwg1XFvbz+ByKSoPGcyUDXrTq2+thqFBtA@mail.gmail.com>
Date:	Mon, 22 Oct 2012 18:08:10 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
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, Oct 22, 2012 at 5:59 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Mon, 2012-10-22 at 17:44 +0200, Stephane Eranian wrote:
>>
>> I know the answer, because I know what's going on under the
>> hood. But what about the average user?
>
> 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.

> The avg user wants time domain measurements, like what's the most
> expensive function, or most expensive cache-miss etc..
>
Yes, you have those too.
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