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

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Message-Id: <20101014173103U.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 14 Oct 2010 17:36:28 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	andi@...stfloor.org
Cc:	fujita.tomonori@....ntt.co.jp, 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, 14 Oct 2010 09:24:21 +0200
Andi Kleen <andi@...stfloor.org> wrote:

> On Thu, Oct 14, 2010 at 04:07:12PM +0900, FUJITA Tomonori 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
> 
> Are any of those in mainline? 

The tricks or the proposals?

I think that at least one mainline driver in arm uses such trick but I
can't recall the name. Better to ask on the arm mainling list. Also I
heard that the are some out-of-tree patches about this.


I think that any such proposal hasn't merged yet. If you are looking
for such examples, here's one:

http://lwn.net/Articles/401107/
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