linux-kernel - Re: [PATCH 14/18] 2.6.17.9 perfmon2 patch for review: new i386 files

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Message-ID: <20060825151043.GK5330@frankl.hpl.hp.com>
Date:	Fri, 25 Aug 2006 08:10:43 -0700
From:	Stephane Eranian <eranian@....hp.com>
To:	Andi Kleen <ak@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/18] 2.6.17.9 perfmon2 patch for review: new i386 files

Andi,

On Fri, Aug 25, 2006 at 04:53:52PM +0200, Andi Kleen wrote:
> On Friday 25 August 2006 16:27, Stephane Eranian wrote:
> 
> > I think I will drop the EXCL_IDLE feature given that most PMU stop
> > counting when you go low-power. The feature does not quite do what
> > we want because it totally exclude the idle from monitoring, yet
> > the idle may be doing useful kernel work, such as fielding interrupts.
> 
> Ok fine. Anything that makes the code less complex is good.
> Currently it is very big and hard to understand.
> 
> (actually at least one newer Intel system I saw seemed to continue counting
> in idle, but that might have been a specific quirk)
> 
How is this affecting your RDTSC "emulation" with perfctr0?

-- 

-Stephane
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