linux-kernel - Re: [PATCH 06/12] Add /proc trigger for memory compaction

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Message-ID: <20100212183854.GB23822@csn.ul.ie>
Date:	Fri, 12 Feb 2010 18:38:54 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Valdis.Kletnieks@...edu
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>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 06/12] Add /proc trigger for memory compaction

On Fri, Feb 12, 2010 at 01:34:40PM -0500, Valdis.Kletnieks@...edu wrote:
> On Fri, 12 Feb 2010 12:00:53 GMT, Mel Gorman said:
> > This patch adds a proc file /proc/sys/vm/compact_memory. When an arbitrary
> > value is written to the file, all zones are compacted. The expected user
> > of such a trigger is a job scheduler that prepares the system before the
> > target application runs.
> 
> Argh. A global trigger in /proc, and a per-node trigger in /sys too.  Can we
> get by with just one or the other?  Should the /proc one live in /sys too?
> 

The sysfs trigger is only visible on NUMA. The proc one is easier to use
when the requirement is "compact all memory". There doesn't appear to be a
suitable place in sysfs for the proc trigger as it's already the case that
all proc tunables are not reflected in sysfs.

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