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

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Message-ID: <Pine.LNX.4.64.0708211614370.6062@schroedinger.engr.sgi.com>
Date:	Tue, 21 Aug 2007 16:17:16 -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:

> SLUB Use cmpxchg() everywhere.
> 
> It applies to "SLUB: Single atomic instruction alloc/free using
> cmpxchg".

> +++ slab/mm/slub.c	2007-08-20 18:42:28.000000000 -0400
> @@ -1682,7 +1682,7 @@ redo:
>  
>  	object[c->offset] = freelist;
>  
> -	if (unlikely(cmpxchg_local(&c->freelist, freelist, object) != freelist))
> +	if (unlikely(cmpxchg(&c->freelist, freelist, object) != freelist))
>  		goto redo;
>  	return;
>  slow:

Ok so regular cmpxchg, no cmpxchg_local. cmpxchg_local does not bring 
anything more? My measurements did not show any difference. I measured on 
Athlon64. What processor is being used?

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