linux-kernel - Re: [PATCH/RFCv4 0/6] The Contiguous Memory Allocator framework

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Date:	Thu, 26 Aug 2010 12:06:00 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Nazarewicz <m.nazarewicz@...sung.com>,
	linux-mm@...ck.org, Daniel Walker <dwalker@...eaurora.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Hans Verkuil <hverkuil@...all.nl>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Pawel Osciak <p.osciak@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Zach Pfeffer <zpfeffer@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org, Mel Gorman <mel@....ul.ie>
Subject: Re: [PATCH/RFCv4 0/6] The Contiguous Memory Allocator framework

On Thu, 2010-08-26 at 18:29 +0900, Minchan Kim wrote:
> As I said following mail, I said about free space problem.
> Of course, compaction could move anon pages into somewhere.
> What's is somewhere? At last, it's same zone.
> It can prevent fragment problem but not size of free space.
> So I mean it would be better to move it into another zone(ex, HIGHMEM)
> rather than OOM kill. 

Real machines don't have highmem, highmem sucks!! /me runs

Does cross zone movement really matter, I though these crappy devices
were mostly used on crappy hardware with very limited memory, so pretty
much everything would be in zone_normal.. no?

But sure, if there's really a need we can look at maybe doing cross zone
movement.
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