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Date: Fri, 7 May 2010 09:08:50 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH] mm,compaction: Do not schedule work on other CPUs for
 compaction
Message-Id: <20100507090850.50d6a11c.kamezawa.hiroyu@jp.fujitsu.com>
In-Reply-To: <20100506150808.GC8704@csn.ul.ie>
References: <20100506150808.GC8704@csn.ul.ie>
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Sender: owner-linux-mm@kvack.org
To: Mel Gorman <mel@csn.ul.ie>
Cc: Andrew Morton <akpm@linux-foundation.org>, Andrea Arcangeli <aarcange@redhat.com>, Christoph Lameter <cl@linux-foundation.org>, Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>, David Rientjes <rientjes@google.com>, Minchan Kim <minchan.kim@gmail.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Rik van Riel <riel@redhat.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org
List-ID: <linux-mm.kvack.org>

On Thu, 6 May 2010 16:08:09 +0100
Mel Gorman <mel@csn.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@csn.ul.ie>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

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