Date: Tue, 30 Nov 2004 18:31:51 +0000
From: Christoph Hellwig <hch@infradead.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.10-rc2-mm4
Message-ID: <20041130183151.GA26967@infradead.org>
Mail-Followup-To: Christoph Hellwig <hch@infradead.org>,
	Arjan van de Ven <arjan@infradead.org>,
	Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
References: <20041130095045.090de5ea.akpm@osdl.org> <1101837994.2640.67.camel@laptop.fenrus.org>
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On Tue, Nov 30, 2004 at 07:06:34PM +0100, Arjan van de Ven wrote:
> On Tue, 2004-11-30 at 09:50 -0800, Andrew Morton wrote:
> > http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.10-rc2/2.6.10-rc2-mm4/
> > 
> > - Various fixes and cleanups
> > 
> > - A decent-sized x86_64 update.
> > 
> > - 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 ??

The purpose is probably to work around 32bit DMA limited devices on the broken
iAMD64 systems.

But I think it's a bad idea, x86_64 doesn't use CONFIG_HIGHMEM at all currenly,
and it could easily use it for that purpose like in the patch in older RH
kernels for ia64.
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