linux-kernel - Re: [PATCH 10/14] Add /sys trigger for per-node memory compaction

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Message-Id: <20100406170559.52093bd5.akpm@linux-foundation.org>
Date:	Tue, 6 Apr 2010 17:05:59 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	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>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 10/14] Add /sys trigger for per-node memory compaction

On Fri,  2 Apr 2010 17:02:44 +0100
Mel Gorman <mel@....ul.ie> wrote:

> This patch adds a per-node sysfs file called compact. When the file is
> written to, each zone in that node is compacted. The intention that this
> would be used by something like a job scheduler in a batch system before
> a job starts so that the job can allocate the maximum number of
> hugepages without significant start-up cost.

Would it make more sense if this was a per-memcg thing rather than a
per-node thing?

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