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

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Message-ID: <20100407154206.GS17882@csn.ul.ie>
Date:	Wed, 7 Apr 2010 16:42:06 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Andrew Morton <akpm@...ux-foundation.org>
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 Tue, Apr 06, 2010 at 05:05:59PM -0700, Andrew Morton wrote:
> 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?
> 

Kamezawa Hiroyuki covered this perfectly. memcg doesn't care and while
cpuset might, there are a lot more people working with nodes than there
are with cpuset.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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