linux-kernel - Re: [patch 0/7] [RFC] SLUB: Improve allocpercpu to reduce per cpu access overhead

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Message-ID: <Pine.LNX.4.64.0710311820340.25687@schroedinger.engr.sgi.com>
Date:	Wed, 31 Oct 2007 18:21:02 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	David Miller <davem@...emloft.net>
cc:	akpm@...ux-foundation.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, mathieu.desnoyers@...ymtl.ca,
	penberg@...helsinki.fi
Subject: Re: [patch 0/7] [RFC] SLUB: Improve allocpercpu to reduce per cpu
 access overhead

On Wed, 31 Oct 2007, David Miller wrote:

> From: Christoph Lameter <clameter@....com>
> Date: Wed, 31 Oct 2007 18:12:11 -0700 (PDT)
> 
> > On Wed, 31 Oct 2007, David Miller wrote:
> > 
> > > All I can do now is bisect and then try to figure out what about the
> > > guilty change might cause the problem.
> > 
> > Reverting the 7th patch should avoid using the sparc register that caches 
> > the per cpu area offset? (I though so, does it?)
> 
> Yes, that's right, %g5 holds the local cpu's per-cpu offset.

And if I add the address of a percpu variable then I get to the variable 
for this cpu right?

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