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

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Date:	Sun, 24 Sep 2006 09:26:40 +0200
From:	Andi Kleen <ak@...e.de>
To:	"Martin J. Bligh" <mbligh@...igh.org>
Cc:	Christoph Lameter <clameter@....com>,
	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


> If it's the 16MB DMA window for ia32 we're talking about, wouldn't
> it be easier just to remove it from the fallback lists? (assuming
> you have at least 128MB of memory or something, blah, blah). Saves
> doing migration later.

That is essentially already the case because the mm has special
heuristics to preserve lower zones. Usually those tend to keep the
16MB mostly free unless you really use GFP_DMA.

-Andi

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