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

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Message-ID: <Pine.LNX.4.64.0708211731410.3354@schroedinger.engr.sgi.com>
Date:	Tue, 21 Aug 2007 17:34:38 -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:

> As I am going back through the initial cmpxchg_local implementation, it
> seems like it was executing __slab_alloc() with preemption disabled,
> which is wrong. new_slab() is not designed for that.

The version I send you did not use preemption.

We need to make a decision if we want to go without preemption and cmpxchg 
or with preemption and cmpxchg_local.

If we really want to do this then the implementation of all of these 
components need to result in competitive performance on all platforms.

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