Date: Tue, 3 Mar 2009 15:14:07 -0500 (EST)
From: Christoph Lameter <cl@linux-foundation.org>
To: David Rientjes <rientjes@google.com>
cc: Pekka Enberg <penberg@cs.helsinki.fi>,
       Andrew Morton <akpm@linux-foundation.org>,
       Paul Menage <menage@google.com>, Randy Dunlap <randy.dunlap@oracle.com>,
       linux-kernel@vger.kernel.org
Subject: Re: [patch 2/2] slub: enforce cpuset restrictions for cpu slabs
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On Tue, 3 Mar 2009, David Rientjes wrote:

> This change doesn't affect the fastpath in any significant way for systems
> that have not configured multiple cpusets; systems that have configured
> more than one cpuset may have specific NUMA locality requirements that
> slub is dismissing without this patch.

SLUB is also "dismissing" lots of other NUMA locality requirements since
it relies on the page allocators for this. SLUB does *not* realize memory
policy and/or cpuset support for individual objects. NUMA locality is
implemented only (aside from explicit requests of memory from a
certain node) when slab page allocations are performed.

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