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

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Message-ID: <alpine.DEB.1.10.0903121206250.5493@qirst.com>
Date:	Thu, 12 Mar 2009 12:08:11 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Matt Mackall <mpm@...enic.com>
cc:	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Paul Menage <menage@...gle.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch -mm] cpusets: add memory_slab_hardwall flag

On Tue, 10 Mar 2009, Matt Mackall wrote:

> > > Yes, and that's why we require the cpuset hardwall on a configurable
> > > per-cpuset basis.  If a cpuset has set this option for its workload, then
> > > it is demanding object allocations from local memory.  Other cpusets that
> > > do not have memory_slab_hardwall set can still allocate from any cpu slab
> > > or partial slab, including those allocated for the hardwall cpuset.
> >
> > You cannot hardwall something that is used in a shared way by processes in
> > multiple cpusets.
>
> He can enforce that every allocation made when a given task is current
> conforms. His patch demonstrates that.

Of course. But that may just be a subset of the data used by a task. If an
inode, dentry and so on was already allocated in the context of another
process then the locality of that allocation will not be changed. The
hardwall will have no effect.


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