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

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Message-ID: <Pine.LNX.4.64.0708211649260.6886@schroedinger.engr.sgi.com>
Date:	Tue, 21 Aug 2007 16:51:14 -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:

> Are you running a UP or SMP kernel ? If you run a UP kernel, the
> cmpxchg_local and cmpxchg are identical.

UP.

> Oh, and if you run your tests at boot time, the alternatives code may
> have removed the lock prefix, therefore making cmpxchg and cmpxchg_local
> exactly the same.

Tests were run at boot time.

That still does not explain kmalloc not showing improvements.

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