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: <4F6B880C.7000805@redhat.com>
Date:	Thu, 22 Mar 2012 16:14:04 -0400
From:	Larry Woodman <lwoodman@...hat.com>
To:	Valdis.Kletnieks@...edu
CC:	Christoph Lameter <cl@...ux.com>,
	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 03/22/2012 03:36 PM, Valdis.Kletnieks@...edu wrote:
> On Thu, 22 Mar 2012 15:07:00 -0400, Larry Woodman said:
>
>> 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?
> Would it make more sense to do 5->6, 4->5, 3->4?  If we move stuff
> from 3 to 4 before clearing the old 4 stuff out, it might get crowded?
>
Yes, I didnt try to imply the order in which pages were moved just
the additional moving necessary.

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