linux-kernel - Re: [PATCH] Add a movablecore= parameter for sizing ZONE

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Date:	Sat, 14 Jul 2007 14:02:08 +0100
From:	mel@...net.ie (Mel Gorman)
To:	Nick Piggin <npiggin@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, kenchen@...gle.com,
	jschopp@...tin.ibm.com, apw@...dowen.org,
	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: [PATCH] Add a movablecore= parameter for sizing ZONE_MOVABLE

On (14/07/07 10:28), Nick Piggin didst pronounce:
> On Fri, Jul 13, 2007 at 04:56:10PM +0100, Mel Gorman wrote:
> > On (12/07/07 22:32), Mel Gorman didst pronounce:
> > 
> > > > 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?
> > > 
> > > Well, yes please from me obviously :) . There is one additional patch
> > > I would like to send on tomorrow and that is providing the movablecore=
> > 
> > This is the patch. It has been boot-tested on a number of machines and
> > behaves as expected. Nick, with this in addition, do you have any
> > objection to the ZONE_MOVABLE patches going through to 2.6.23?
> 
> What's the status of making it configurable? I didn't see something
> in -mm for that yet?
> 

I have a patch that makes it configurable but Kamezawa-san posted a very
promising patch about making all zones configurable in a very clever way
which is more general than what I did. He posted it as an RFC[1] and there
was feedback from Andy Whitcroft on how it could be made better so it wouldn't
have been picked up for -mm but something is in the pipeline.

I've tested his patch for zone movable and it worked as advertised so I
intended to see post-merge window what else could be done with it clean-up
wise. I am curious to see if it can also make ZONE_NORMAL configurable on
machines that only have ZONE_DMA for example.

> But that's not as important as ensuring the concept and user visible
> stuff is in good shape, which I no longer have any problems with.

Excellent.

> So
> yeah I think it would be good to get this in and get people up and
> running with it.

Thanks Nick.

[1] http://marc.info/?l=linux-mm&m=118405871911268&w=2

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