linux-kernel - Re: [PATCH 2/8] Create the ZONE

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Message-ID: <Pine.LNX.4.64.0701261648280.23091@skynet.skynet.ie>
Date:	Fri, 26 Jan 2007 16:49:00 +0000 (GMT)
From:	Mel Gorman <mel@....ul.ie>
To:	Christoph Lameter <clameter@....com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/8] Create the ZONE_MOVABLE zone

On Fri, 26 Jan 2007, Christoph Lameter wrote:

> On Thu, 25 Jan 2007, Mel Gorman wrote:
>
>> @@ -166,6 +168,8 @@ enum zone_type {
>>  #define ZONES_SHIFT 1
>>  #elif __ZONE_COUNT <= 4
>>  #define ZONES_SHIFT 2
>> +#elif __ZONE_COUNT <= 8
>> +#define ZONES_SHIFT 3
>>  #else
>
> You do not need a shift of 3. Even with ZONE_MOVABLE the maximum
> number of zones is still 4.
>
> x86_64 has DMA, DMA32, NORMAL, MOVABLE
> i386 has DMA, NORMAL, HIGHMEM, MOVABLE
>
> x86_64 is the only platform that has DMA32.
>

Good point. I'll recheck this to be sure but if it's true, it means that 
the only major collision point between these patches and the optional 
ZONE_DMA patches goes away.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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