linux-kernel - Re: More thoughts on getting rid of ZONE

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Message-Id: <200609230239.57694.ak@suse.de>
Date:	Sat, 23 Sep 2006 02:39:57 +0200
From:	Andi Kleen <ak@...e.de>
To:	Christoph Lameter <clameter@....com>
Cc:	Martin Bligh <mbligh@...igh.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, akpm@...gle.com,
	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	James Bottomley <James.Bottomley@...eleye.com>,
	linux-mm@...ck.org
Subject: Re: More thoughts on getting rid of ZONE_DMA

On Saturday 23 September 2006 02:23, Christoph Lameter wrote:
> On Sat, 23 Sep 2006, Andi Kleen wrote:
> 
> > The problem is that if someone has a workload with lots of pinned pages
> > (e.g. lots of mlock) then the first 16MB might fill up completely and there 
> > is no chance at all to free it because it's pinned
> 
> Ok. That may be a problem for i386. After the removal of the GFP_DMA 
> and ZONE_DMA stuff it is then be possible to redefine ZONE_DMA (or 
> whatever we may call it ZONE_RESERVE?) to an arbitrary size a the 
> beginning of memory. Then alloc_pages_range() can dynamically decide to 
> tap that pool if necessary. 

That's should work yes. Just we need the pool.

-Andi
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