linux-kernel - Re: [patch 2/2] slub: enforce cpuset restrictions for cpu slabs

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Date:	Tue, 3 Mar 2009 11:05:04 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Menage <menage@...gle.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 2/2] slub: enforce cpuset restrictions for cpu slabs

On Tue, 3 Mar 2009, Christoph Lameter wrote:

> > There is no alternative solution to prevent egregious amounts of slab to
> > be allocated in a disjoint cpuset that is supposedly mem_exclusive.
> 
> The amount of memory is limited by the size of a slab page. If the process
> goes beyond that amount then the page allocator will come in and enforce
> the boundaries.
> 

Not until all of the partial slabs on the local node are full, which could 
be significant given s->min_partial.

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.
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