linux-kernel - Re: [patch 2/2] cpusets: add interleave_over

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Message-ID: <Pine.LNX.4.64.0710251635420.9635@schroedinger.engr.sgi.com>
Date:	Thu, 25 Oct 2007 16:37:30 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	David Rientjes <rientjes@...gle.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>, Andi Kleen <ak@...e.de>,
	Paul Jackson <pj@....com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 2/2] cpusets: add interleave_over_allowed option

On Thu, 25 Oct 2007, David Rientjes wrote:

> Adds a new 'interleave_over_allowed' option to cpusets.
> 
> When a task with an MPOL_INTERLEAVE memory policy is attached to a cpuset
> with this option set, the interleaved nodemask becomes the cpuset's
> mems_allowed.  When the cpuset's mems_allowed changes, the interleaved
> nodemask for all tasks with MPOL_INTERLEAVE memory policies is also
> updated to be the new mems_allowed nodemask.
> 
> This allows applications to specify that they want to interleave over all
> nodes that they are allowed to access.  This set of nodes can be changed
> at any time via the cpuset interface and each individual memory policy is
> updated to reflect the changes for all attached tasks when this option is
> set.

More interactions between cpusets and memory policies. We have to be 
careful here to keep clean semantics.

Isnt it a bit surprising for an application that has set up a custom 
MPOL_INTERLEAVE policy if the nodes suddenly change because of a cpuset or 
mems_allowed change?


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