linux-kernel - Re: [PATCH 0/8] Use memory compaction instead of lumpy reclaim during high-order allocations

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Message-ID: <20101119140532.GH28613@csn.ul.ie>
Date:	Fri, 19 Nov 2010 14:05:32 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Theodore Tso <tytso@....EDU>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/8] Use memory compaction instead of lumpy reclaim
	during high-order allocations

On Fri, Nov 19, 2010 at 07:43:02AM -0500, Theodore Tso wrote:
> 
> On Nov 19, 2010, at 5:48 AM, Mel Gorman wrote:
> 
> > At least as long as !CONFIG_COMPACTION exists. That will be a while because
> > bear in mind CONFIG_COMPACTION is disabled by default (although I believe
> > some distros are enabling it at least). Maybe we should choose to deprecate
> > it in 2.6.40 and delete it at the infamous time of 2.6.42? That would give
> > ample time to iron out any issues that crop up with reclaim/compaction
> > (what this series has turned into).
> 
> How about making the default before 2.6.40, as an initial step?
> 

It'd be a reasonable way of ensuring it's being tested everywhere
and not by those that are interested or using distro kernel configs.
I guess we'd set to "default y" in the same patch that adds the note to
feature-removal-schedule.txt.

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