linux-kernel - Re: [PATCH -tip] perf_counter: Add Generalized Hardware FPU support for AMD

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Message-ID: <20090701131217.GA13524@elte.hu>
Date:	Wed, 1 Jul 2009 15:12:17 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] perf_counter: Add Generalized Hardware FPU
	support for AMD


* Paul Mackerras <paulus@...ba.org> wrote:

> Ingo Molnar writes:
> 
> >         19583739  vec-adds               (   2.01x scaled)
> >         20856051  vec-muls               (   2.01x scaled)
> >         20856051  vec-divs               (   2.01x scaled)
> >      25100224054  vec-idle-cycles        (   1.99x scaled)
> >         12540131  vec-busy-cycles        (   1.99x scaled)
> >         42286702  vec-ops                (   2.01x scaled)
> > 
> > Paulus: would this categorization fit PowerPC too?
> 
> Conceptually that looks nice, but unfortunately we don't have 
> events that correspond to that categorization on any PowerPC with 
> vector hardware (VMX/Altivec).  POWER6 seems to have the most 
> vector events, and they are mostly divided up along the lines of 
> simple / complex / permute / load / store operations, and whether 
> they are integer or floating-point operations.

Here's what we have on x86:

     20177177044  vec-adds                  (scaled from 66.63%)
     34101687027  vec-muls                  (scaled from 66.64%)
      3984060862  vec-divs                  (scaled from 66.71%)
     26349684710  vec-idle-cycles           (scaled from 66.65%)
      9052001905  vec-stall-cycles          (scaled from 66.66%)
     76440734242  vec-ops                   (scaled from 66.71%)

Could at least the idle/busy/stall/total generic stats be filled in 
on powerpc, with a reasonable enough approximation? Those 
utilization metrics are the most important ones when one tries to 
figure out how well utilized the vector units are.

	Ingo
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