linux-kernel - Re: [RFC][PATCH 1/3] contigous big page allocator

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Date:	Thu, 14 Oct 2010 15:09:13 +0300
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	andi@...stfloor.org, kamezawa.hiroyu@...fujitsu.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	minchan.kim@...il.com
Subject: Re: [RFC][PATCH 1/3] contigous big page allocator

On Thu, Oct 14, 2010 at 10:07 AM, FUJITA Tomonori
<fujita.tomonori@....ntt.co.jp> wrote:
> On Wed, 13 Oct 2010 09:01:43 +0200
> Andi Kleen <andi@...stfloor.org> wrote:
>
>> KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> writes:
>> >
>> > What this wants to do:
>> >   allocates a contiguous chunk of pages larger than MAX_ORDER.
>> >   for device drivers (camera? etc..)
>>
>> I think to really move forward you need a concrete use case
>> actually implemented in tree.
>
> As already pointed out, some embeded drivers need physcailly
> contignous memory. Currenlty, they use hacky tricks (e.g. playing with
> the boot memory allocators). There are several proposals for this like
> adding a new kernel memory allocator (from samsung).
>
> It's ideal if the memory allocator can handle this, I think.

Not only contiguous, but sometimes also coherent.

-- 
Felipe Contreras
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