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

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Message-ID: <20100219160239.GB15619@kroah.com>
Date:	Fri, 19 Feb 2010 08:02:39 -0800
From:	Greg KH <greg@...ah.com>
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>,
	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 03:52:13PM +0000, Mel Gorman wrote:
> On Fri, Feb 19, 2010 at 03:51:17PM +0000, Mel Gorman wrote:
> > On Fri, Feb 19, 2010 at 07:31:42AM -0800, Greg KH wrote:
> > > On Fri, Feb 19, 2010 at 03:28:30PM +0000, Mel Gorman wrote:
> > > > 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.
> > > 
> > > Well, you can always just document what you add, or you can document the
> > > existing stuff as well.  It's your choice :)
> > > 
> > 
> > Fair point!
> > 
> > I've taken note to document what's in there over time. For the moment,
> > is this a reasonable start? I'll split it into two patches but the end
> > result will be the same.
> > 
> 
> Bah, as I hit send, I recognised my folly. The first entry should be in
> stable/ and the second should be in testing/.
> 

Heh, no problem, looks good to me, thanks for doing this.

greg k-h
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