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

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Message-Id: <20100826124434.6089630d.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 26 Aug 2010 12:44:34 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Michał Nazarewicz <m.nazarewicz@...sung.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hans Verkuil <hverkuil@...all.nl>,
	Daniel Walker <dwalker@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Jonathan Corbet <corbet@....net>,
	Peter Zijlstra <peterz@...radead.org>,
	Pawel Osciak <p.osciak@...sung.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	linux-kernel@...r.kernel.org,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-mm@...ck.org, Kyungmin Park <kyungmin.park@...sung.com>,
	Zach Pfeffer <zpfeffer@...eaurora.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Mel Gorman <mel@....ul.ie>, linux-media@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH/RFCv4 0/6] The Contiguous Memory Allocator framework

On Thu, 26 Aug 2010 11:50:17 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
 
> 128MB...too big ? But it's depend on config.
> 
> IBM's ppc guys used 16MB section, and recently, a new interface to shrink
> the number of /sys files are added, maybe usable.
> 
> Something good with this approach will be you can create "cma" memory
> before installing driver.
> 
> But yes, complicated and need some works.
> 
Ah, I need to clarify what I want to say.

With compaction, it's helpful, but you can't get contiguous memory larger
than MAX_ORDER, I think. To get memory larger than MAX_ORDER on demand,
memory hot-plug code has almost all necessary things.

you may able to add
# echo 0xa0000000-0xa80000000 > /sys/devices/system/memory/cma

to get contiguous isolated memory.

BTW, just curious...the memory for cma need not to be saved at
hibernation ? Or drivers has to write its own hibernation ops by driver suspend
udev or some ?



Thanks,
-Kame

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