Date: Tue, 30 Nov 2004 10:32:18 -0800
From: Andrew Morton <akpm@osdl.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.10-rc2-mm4
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Arjan van de Ven <arjan@infradead.org> wrote:
>
> > > > - x86_64 supports a fourth VM zone: ZONE_DMA32.  This may affect memory
>  > > >   reclaim, but shouldn't.
>  > > 
>  > > 
>  > > what is the purpose of such a zone ??
>  > 
>  > For pages which have a physical address <4G.  I assume this was motivated
>  > by the lack of an IOMMU on ia32e?
> 
>  but there's the swiommu for those... so that can't be it
>  realistically....

"This helps mainly graphic drivers who really need a lot of memory below
the 4GB area.  Previous they could only use IOMMU+16MB GFP_DMA, which was
not enough memory."

>  Is there code using the zone GFP mask yet ??

Nope.
-
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