linux-kernel - Re: [PATCH 1/2 -tip] perf_counter: Add generalized hardware vectored co-processor support for AMD and Intel Corei7/Nehalem

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Message-ID: <20090703102953.GF32128@elte.hu>
Date:	Fri, 3 Jul 2009 12:29:53 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Anton Blanchard <anton@...ba.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH 1/2 -tip] perf_counter: Add generalized hardware
	vectored co-processor support for AMD and Intel Corei7/Nehalem


* Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:

>  Performance counter stats for '/usr/bin/rhythmbox /home/jaswinder/Music/singhiskinng.mp3':
> 
>        17552264  vec-adds                  (scaled from 66.28%)
>        19715258  vec-muls                  (scaled from 66.63%)
>        15862733  vec-divs                  (scaled from 66.82%)
>     23735187095  vec-idle-cycles           (scaled from 66.89%)
>        11353159  vec-stall-cycles          (scaled from 66.90%)
>        36628571  vec-ops                   (scaled from 66.48%)

Is stall-cycles equivalent to busy-cycles? I.e. do we have this 
general relationship to the cycle event:

	cycles = vec-stall-cycles + vec-idle-cycles

?

	Ingo
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