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: <1246622122.2322.25.camel@jaswinder.satnam>
Date:	Fri, 03 Jul 2009 17:25:22 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
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

On Fri, 2009-07-03 at 12:29 +0200, Ingo Molnar wrote:
> * 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? 


hmm, normally we can use these terms interchangeably. But they can be
different some times.

busy means it is already executing some instructions so it will not take
another instruction.

stall can be busy(executing) or non-executing may be it is waiting for
some operands due to cache miss.


> I.e. do we have this 
> general relationship to the cycle event:
> 
> 	cycles = vec-stall-cycles + vec-idle-cycles
> 
> ?

This patch is already big enough, having 206 lines. Do you want
everything in this patch ;-)

Or we can do these things later on.

Thanks,
--
JSR

http://userweb.kernel.org/~jaswinder/


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