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Date:	Fri, 7 Mar 2008 05:37:00 +0100
From:	Nick Piggin <>
To:	Christoph Lameter <>
	Linux Kernel Mailing List <>,, David Miller <>,
	Eric Dumazet <>
Subject: Re: [rfc][patch 2/3] slab: introduce SMP alignment

On Mon, Mar 03, 2008 at 01:31:14PM -0800, Christoph Lameter wrote:
> On Mon, 3 Mar 2008, Nick Piggin wrote:
> > And maybe the VSMP guys will want to blow this out to their internode
> > alignment?
> > 
> > max(!CONFIG_TINY && num_possible_cpus() > 1 ? (is_vsmp ? internode_alignemnt : cache_line_size()) : 0, mandatory_alignment)
> No the slab allocators were optimized for VSMP so that the 
> internode_alignment is not necessary there. That was actually one of the 
> requirements that triggered the slab numa work.

BTW. can you explain this incredible claim that the slab allocators
do not need internode_alignment to avoid false sharing of allocated
objects on VSMP? I don't understand how that would work at all.

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