linux-kernel - Re: [PATCH] mm,compaction: Do not schedule work on other CPUs for compaction

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Date:	Thu, 06 May 2010 11:33:59 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm,compaction: Do not schedule work on other CPUs for
 compaction

On 05/06/2010 11:08 AM, Mel Gorman wrote:
> Migration normally requires a call to migrate_prep() as a preparation
> step. This schedules work on all CPUs for pagevecs to be drained. This
> makes sense for move_pages and memory hot-remove but is unnecessary
> for memory compaction.
>
> To avoid queueing work on multiple CPUs, this patch introduces
> migrate_prep_local() which drains just local pagevecs.
>
> This patch can be either merged with mmcompaction-memory-compaction-core.patch
> or placed immediately after it to clarify why migrate_prep_local() was
> introduced.
>
> Signed-off-by: Mel Gorman<mel@....ul.ie>

Reviewed-by: Rik van Riel <riel@...hat.com>
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