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

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Message-ID: <alpine.DEB.2.00.1203221421570.25011@router.home>
Date:	Thu, 22 Mar 2012 14:30:44 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Larry Woodman <lwoodman@...hat.com>
cc:	KOSAKI Motohiro <kosaki.motohiro@...il.com>, linux-mm@...ck.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Motohiro Kosaki <mkosaki@...hat.com>
Subject: Re: [PATCH -mm] do_migrate_pages() calls migrate_to_node() even if
 task is already on a correct node

On Thu, 22 Mar 2012, Larry Woodman wrote:

> > Application may manage their locality given a range of nodes and each of
> > the x .. x+n nodes has their particular purpose.
> So to be clear on this, in that case the intention would be move 3 to 4, 4 to
> 5 and 5 to 6
> to keep the node ordering the same?

Yup. Have a look at do_migrate_pages and the descrition in the comment by
there by Paul Jackson.


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