linux-kernel - Re: [PATCH 3/4] Embed zone_id information within the zonelist->zones pointer

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Message-ID: <20070814210551.GU3406@bingen.suse.de>
Date:	Tue, 14 Aug 2007 23:05:51 +0200
From:	Andi Kleen <ak@...e.de>
To:	Andy Isaacson <adi@...apodia.org>
Cc:	Andi Kleen <ak@...e.de>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Christoph Lameter <clameter@....com>,
	Mel Gorman <mel@...net.ie>, Lee.Schermerhorn@...com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-mips@...ux-mips.org
Subject: Re: [PATCH 3/4] Embed zone_id information within the zonelist->zones pointer

> Yeah, if you stick a PCI chip with a 30-bit PCI DMA mask into a machine
> with memory above 1GB, then copying has to happen.  Unless the memory
> allocator can avoid returning memory in the un-dma-able region...

With GFP_DMA this was possible, but the capability will be gone
for x86 systems if your required DMA region is < 4GB.

Besides I'm currently not planning to change mips so it might
stay the same if Ralf prefers that.

-Andi
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