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

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Message-Id: <20100507090850.50d6a11c.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 7 May 2010 09:08:50 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.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>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.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 Thu, 6 May 2010 16:08:09 +0100
Mel Gorman <mel@....ul.ie> 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: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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