linux-kernel - Re: [PATCH v2 10/12] Maintain preemptability count even for !CONFIG

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Message-ID: <1259578793.20516.130.camel@laptop>
Date:	Mon, 30 Nov 2009 11:59:53 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	Christoph Lameter <cl@...ux-foundation.org>, kvm@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, avi@...hat.com,
	mingo@...e.hu, tglx@...utronix.de, hpa@...or.com, riel@...hat.com
Subject: Re: [PATCH v2 10/12] Maintain preemptability count even for
 !CONFIG_PREEMPT kernels

On Mon, 2009-11-30 at 12:58 +0200, Gleb Natapov wrote:
> On Mon, Nov 30, 2009 at 12:56:12PM +0200, Gleb Natapov wrote:
> > On Tue, Nov 24, 2009 at 09:14:03AM -0600, Christoph Lameter wrote:
> > > On Tue, 24 Nov 2009, Gleb Natapov wrote:
> > > 
> > > > On Mon, Nov 23, 2009 at 11:30:02AM -0600, Christoph Lameter wrote:
> > > > > This adds significant overhead for the !PREEMPT case adding lots of code
> > > > > in critical paths all over the place.
> > > > I want to measure it. Can you suggest benchmarks to try?
> > > 
> > > AIM9 (reaim9)?
> > Below are results for kernel 2.6.32-rc8 with and without the patch (only
> > this single patch is applied).
> > 
> Forgot to tell. The results are average between 5 different runs.

Would be good to also report the variance over those 5 runs, allows us
to see if the difference is within the noise.

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