linux-kernel - Re: [PATCH -mm V2] do_migrate_pages() calls migrate_to_node() even if task is already on a correct node

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Date:	Tue, 24 Apr 2012 11:08:25 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Larry Woodman <lwoodman@...hat.com>
cc:	linux-mm@...ck.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Motohiro Kosaki <mkosaki@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH -mm V2] do_migrate_pages() calls migrate_to_node() even
 if task is already on a correct node

On Tue, 24 Apr 2012, Larry Woodman wrote:

> While moving tasks between cpusets we noticed some strange behavior.
> Specifically if the nodes of the destination
> cpuset are a subset of the nodes of the source cpuset do_migrate_pages() will
> move pages that are already on a node
> in the destination cpuset.  The reason for this is do_migrate_pages() does not
> check whether each node in the source
> nodemask is in the destination nodemask before calling migrate_to_node().  If
> we simply do this check and skip them
> when the source is in the destination moving we wont move nodes that dont need
> to be moved.

Acked-by: Christoph Lameter <cl@...ux.com>
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