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

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Message-ID: <20100826055417.GA5157@cr0.nay.redhat.com>
Date:	Thu, 26 Aug 2010 13:54:17 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Michał Nazarewicz <m.nazarewicz@...sung.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	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, Mel Gorman <mel@....ul.ie>,
	Hans Verkuil <hverkuil@...all.nl>, linux-mm@...ck.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Zach Pfeffer <zpfeffer@...eaurora.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org
Subject: Re: [PATCH/RFCv4 0/6] The Contiguous Memory Allocator framework

On Thu, Aug 26, 2010 at 06:01:56AM +0200, Michał Nazarewicz wrote:
>KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
>>128MB...too big ? But it's depend on config.
>
>On embedded systems it may be like half of the RAM.  Or a quarter.  So bigger
>granularity could be desired on some platforms.
>
>>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.
>
>That's how CMA works at the moment.  But if I understand you correctly, what
>you are proposing would allow to reserve memory *at* *runtime* long after system
>has booted.  This would be a nice feature as well though.
>

Yeah, if we can do this, that will avoid rebooting for kdump to reserve
memory.

Thanks.
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