linux-kernel - Re: [PATCH] SLUB use cmpxchg

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Message-ID: <Pine.LNX.4.64.0708211640430.6225@schroedinger.engr.sgi.com>
Date:	Tue, 21 Aug 2007 16:41:25 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	mingo@...hat.com
Subject: Re: [PATCH] SLUB use cmpxchg_local

On Tue, 21 Aug 2007, Mathieu Desnoyers wrote:

> Using cmpxchg_local vs cmpxchg has a clear impact on the fast paths, as
> shown below: it saves about 60 to 70 cycles for kmalloc and 200 cycles
> for the kmalloc/kfree pair (test 2).

Hmmmm.. I wonder if the AMD processors simply do the same in either 
version.
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