linux-kernel - Re: [PATCH 0/2] perf stat: add per-core count aggregation

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Date:	Tue, 12 Feb 2013 18:33:42 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH 0/2] perf stat: add per-core count aggregation

On Tue, Feb 12, 2013 at 6:29 PM, Andi Kleen <ak@...ux.intel.com> wrote:
>>
>> > The idea itself is useful.
>> >
>> Yes, it is.
>
> BTW it would be even more useful if it could print some of the
> statistics turbostat does (in particular frequency and C0 residency)
> Often you only care about cycles not idle, and the frequency
> tells you how fast the cycles happen.
>
You get C-state residency at the socket level with my perf uncore
patch.

This patch is just about helping with unbalance at the physical
core level.

> I think Cx could be added relatively easily as a software event,
> but frequency doesn't fit very well into the perf counting model,
> as it's really sampling.
>
> -Andi
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