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

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Message-ID: <Pine.LNX.4.64.0708131506030.28502@schroedinger.engr.sgi.com>
Date:	Mon, 13 Aug 2007 15:09:55 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andi Kleen <ak@...e.de>
cc:	Mel Gorman <mel@...net.ie>, Lee.Schermerhorn@...com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 3/4] Embed zone_id information within the zonelist->zones
 pointer

On Tue, 14 Aug 2007, Andi Kleen wrote:

> On Mon, Aug 13, 2007 at 03:00:14PM -0700, Christoph Lameter wrote:
> > You said that ZONE_DMA will still be there right? So the zone will be 
> 
> There will be a (variable sized) dma zone, but not a ZONE_DMA entry in pgdat 
> or in the the fallback lists.

Ahh.. Okay.

> > > There are still other architectures that use it. Biggest offender
> > > is s390. I'll leave them to their respective maintainers.
> > 
> > IA64 also uses ZONE_DMA to support 32bit controllers. 
> 
> ZONE_DMA32 I thought?  That one is not changed.

x86_64 is the only platforms that uses ZONE_DMA32. Ia64 and other 64 bit 
platforms use ZONE_DMA for <4GB allocs.

> > If so then it may be better to drop ZONE_DMA32 and make ZONE_DMA be below 
> > 4GB like other 64bit arches.
> 
> That might be possible as a followup, but would change the driver
> API. Is it worth it? 

It would leave the driver API as is for many arches.

I think s/ZONE_DMA32/ZONE_DMA would restore the one DMA zone thing which 
is good. We could drop all ZONE_DMA32 stuff that is only needed by a 
single arch.


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