linux-kernel - Re: [Linaro-mm-sig] [PATCH 08/10] mm: cma: Contiguous Memory Allocator added

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Message-ID: <op.vxhix1zu3l0zgt@mnazarewicz-glaptop>
Date:	Wed, 22 Jun 2011 18:04:39 +0200
From:	"Michal Nazarewicz" <mina86@...a86.com>
To:	"Marek Szyprowski" <m.szyprowski@...sung.com>,
	"Arnd Bergmann" <arnd@...db.de>
Cc:	"'Hans Verkuil'" <hverkuil@...all.nl>,
	"'Daniel Walker'" <dwalker@...eaurora.org>,
	"'Jesse Barker'" <jesse.barker@...aro.org>,
	"'Mel Gorman'" <mel@....ul.ie>,
	"'KAMEZAWA Hiroyuki'" <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
	linux-mm@...ck.org, "'Kyungmin Park'" <kyungmin.park@...sung.com>,
	"'Ankita Garg'" <ankita@...ibm.com>,
	"'Andrew Morton'" <akpm@...ux-foundation.org>,
	linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org
Subject: Re: [Linaro-mm-sig] [PATCH 08/10] mm: cma: Contiguous Memory
 Allocator added

On Wed, 22 Jun 2011 15:39:23 +0200, Arnd Bergmann <arnd@...db.de> wrote:
> Why that? I would expect you can do the same that hugepages (used to) do
> and just attempt high-order allocations. If they succeed, you can add  
> them as a CMA region and free them again, into the movable set of pages,  
> otherwise you just fail the  request from user space when the memory is
> already fragmented.

Problem with that is that CMA needs to have whole pageblocks allocated
and buddy can allocate at most half a pageblock.

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michal "mina86" Nazarewicz    (o o)
ooo +-----<email/xmpp: mnazarewicz@...gle.com>-----ooO--(_)--Ooo--
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