linux-kernel - Re: [PATCH 10/12] Add /sys trigger for per-node memory compaction

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Message-ID: <20100219152830.GB1445@csn.ul.ie>
Date:	Fri, 19 Feb 2010 15:28:30 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Greg KH <greg@...ah.com>
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>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 10/12] Add /sys trigger for per-node memory compaction

On Fri, Feb 19, 2010 at 06:53:59AM -0800, Greg KH wrote:
> On Thu, Feb 18, 2010 at 06:02:40PM +0000, Mel Gorman 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.
> 
> As you are adding sysfs files, can you please also add documentation for
> the file in Documentation/ABI/ ?
> 

I looked at this before and hit a wall and then forgot about it. I couldn't
find *where* I should document it at the time. There isn't a sysfs-devices-node
file to add to and much (all?) of what is in that branch appears undocumented.

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