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

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Date:	Wed, 7 Apr 2010 09:31:48 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mel@....ul.ie>, 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 10/14] Add /sys trigger for per-node memory compaction

On Tue, 6 Apr 2010 17:05:59 -0700
Andrew Morton <akpm@...ux-foundation.org> 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?

memcg doesn't have any relationship with placement of memory (now).
It's just controls the amount of memory.
So, memcg has no relationship with compaction.

A cgroup which controls placement of memory is cpuset.
One idea is per cpuset. But per-node seems ok.

Thanks,
-Kame

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