linux-kernel - Re: [PATCHv8 00/12] Contiguous Memory Allocator

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Message-ID: <8yasjxobc1o.fsf@huya.qualcomm.com>
Date:	Thu, 23 Dec 2010 10:04:51 -0800
From:	David Brown <davidb@...eaurora.org>
To:	Felipe Contreras <felipe.contreras@...il.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Ankita Garg <ankita@...ibm.com>,
	Daniel Walker <dwalker@...eaurora.org>,
	Kyungmin Park <kmpark@...radead.org>,
	linux-media@...r.kernel.org,
	Johan MOSSBERG <johan.xx.mossberg@...ricsson.com>,
	Mel Gorman <mel@....ul.ie>, linux-kernel@...r.kernel.org,
	Michal Nazarewicz <mina86@...a86.com>, linux-mm@...ck.org,
	linux-arm-kernel@...ts.infradead.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tomasz Fujak <t.fujak@...sung.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCHv8 00/12] Contiguous Memory Allocator

Felipe Contreras <felipe.contreras@...il.com> writes:

> On Thu, Dec 23, 2010 at 4:16 PM, Russell King - ARM Linux

> A generic solution (that I think I already proposed) would be to
> reserve a chunk of memory for the CMA that can be removed from the
> normally mapped kernel memory through memblock at boot time. The size
> of this memory region would be configurable through kconfig. Then, the
> CMA would have a "dma" flag or something, and take chunks out of it
> until there's no more, and then return errors. That would work for
> ARM.

That sounds an awful lot like the Android kernel's pmem implementation.

Solving this problem is important for us as well, but, I'm not sure I
see a better solution that something like Felipe suggests.

The disadvantage, of course, being that the memory isn't available for
the system when the user isn't doing the multi-media.

David

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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