linux-kernel - Re: [patch -mm v2] cpusets: add memory_slab

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Message-ID: <alpine.DEB.1.10.0903121510380.21607@qirst.com>
Date:	Thu, 12 Mar 2009 15:12:14 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Matt Mackall <mpm@...enic.com>,
	Paul Menage <menage@...gle.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch -mm v2] cpusets: add memory_slab_hardwall flag

On Thu, 12 Mar 2009, David Rientjes wrote:

> Yes, jobs are running in the leaf with my above example.  And it's quite
> possible that the higher level has segmented the machine for NUMA locality
> and then further divided that memory for individual jobs.  When a job
> completes or is killed, the slab cache that it has allocated can be freed
> in its entirety with no partial slab fragmentation (i.e. there are no
> objects allocated from its slabs for disjoint, still running jobs).  That
> cpuset may then serve another job.

Looks like we are talking about a differing project here. Partial slabs
are shared between all processors with SLUB. Slab shares the partial slabs
for the processors on the same node.


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