Date: Tue, 14 Aug 2007 23:05:51 +0200
From: Andi Kleen <ak@suse.de>
To: Andy Isaacson <adi@hexapodia.org>
Cc: Andi Kleen <ak@suse.de>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Christoph Lameter <clameter@sgi.com>, Mel Gorman <mel@skynet.ie>,
       Lee.Schermerhorn@hp.com, linux-kernel@vger.kernel.org,
       linux-mm@kvack.org, linux-mips@linux-mips.org
Subject: Re: [PATCH 3/4] Embed zone_id information within the zonelist->zones pointer
Message-ID: <20070814210551.GU3406@bingen.suse.de>
References: <20070813230801.GH3406@bingen.suse.de> <Pine.LNX.4.64.0708131536340.29946@schroedinger.engr.sgi.com> <20070813234322.GJ3406@bingen.suse.de> <Pine.LNX.4.64.0708131553050.30626@schroedinger.engr.sgi.com> <20070814000041.GL3406@bingen.suse.de> <20070814002223.2d8d42c5@the-village.bc.nu> <20070814001441.GN3406@bingen.suse.de> <20070814191158.GB14093@hexapodia.org> <20070814202350.GT3406@bingen.suse.de> <20070814194356.GL21492@hexapodia.org>
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> 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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