linux-kernel - Re: -mm merge plans -- anti-fragmentation

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Date:	Fri, 13 Jul 2007 11:20:25 +0100
From:	Andy Whitcroft <apw@...dowen.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Mel Gorman <mel@...net.ie>, npiggin@...e.de, kenchen@...gle.com,
	jschopp@...tin.ibm.com, kamezawa.hiroyu@...fujitsu.com,
	a.p.zijlstra@...llo.nl, y-goto@...fujitsu.com, clameter@....com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: -mm merge plans -- anti-fragmentation

Andrew Morton wrote:
> On Tue, 10 Jul 2007 11:20:43 +0100
> mel@...net.ie (Mel Gorman) wrote:
> 
>>> create-the-zone_movable-zone.patch
>>> allow-huge-page-allocations-to-use-gfp_high_movable.patch
>>> handle-kernelcore=-generic.patch
>>>
>>>  Mel's moveable-zone work.  In a similar situation.  We need to stop whatever
>>>  we're doing and get down and work out what we're going to do with all this
>>>  stuff.
>>>
>> Whatever about grouping pages by mobility, I would like to see these go
>> through. They have a real application for hugetlb pool resizing where the
>> administrator knows the range of hugepages that will be required but doesn't
>> want to waste memory when the required number of hugepages is small. I've
>> cc'd Kenneth Chen as I believe he has run into this problem recently where
>> I believe partitioning memory would have helped. He'll either confirm or deny.
> 
> Still no decision here, really.
> 
> Should we at least go for
> 
> add-__gfp_movable-for-callers-to-flag-allocations-from-high-memory-that-may-be-migrated.patch
> create-the-zone_movable-zone.patch
> allow-huge-page-allocations-to-use-gfp_high_movable.patch
> handle-kernelcore=-generic.patch
> 
> in 2.6.23?

These patches are pretty simple and self-contained utilising the
existing zone infrastructure.  They provide a significant degree of
placement control when configured, which gives a lot of the benefits of
grouping-pages-by-mobility.  Merging these would seem like a low-risk
option.

Having a degree of placement control as delivered by ZONE_MOVABLE
greatly increases the effectiveness of lumpy reclaim at higher orders.
These patches plus lumpy would (IMO) provide a good base for further
development.  In particular I would envisage better usability for
hugepage users in terms of simpler configuration.

I would like to see ZONE_MOVABLE and lumpy considered for 2.6.23.

-apw
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