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To: "Marek Szyprowski" <m.szyprowski@samsung.com>,
        "Arnd Bergmann" <arnd@arndb.de>
Cc: "'Hans Verkuil'" <hverkuil@xs4all.nl>,
        "'Daniel Walker'" <dwalker@codeaurora.org>,
        "'Jesse Barker'" <jesse.barker@linaro.org>,
        "'Mel Gorman'" <mel@csn.ul.ie>,
        "'KAMEZAWA Hiroyuki'" <kamezawa.hiroyu@jp.fujitsu.com>,
        linux-kernel@vger.kernel.org, linaro-mm-sig@lists.linaro.org,
        linux-mm@kvack.org, "'Kyungmin Park'" <kyungmin.park@samsung.com>,
        "'Ankita Garg'" <ankita@in.ibm.com>,
        "'Andrew Morton'" <akpm@linux-foundation.org>,
        linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org
Subject: Re: [Linaro-mm-sig] [PATCH 08/10] mm: cma: Contiguous Memory
 Allocator added
References: <1307699698-29369-1-git-send-email-m.szyprowski@samsung.com>
 <201106221442.20848.arnd@arndb.de>
 <003701cc30de$7a159710$6e40c530$%szyprowski@samsung.com>
 <201106221539.24044.arnd@arndb.de>
Date: Wed, 22 Jun 2011 18:04:39 +0200
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From: "Michal Nazarewicz" <mina86@mina86.com>
Message-ID: <op.vxhix1zu3l0zgt@mnazarewicz-glaptop>
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On Wed, 22 Jun 2011 15:39:23 +0200, Arnd Bergmann <arnd@arndb.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@google.com>-----ooO--(_)--Ooo--
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