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Date: Wed, 11 Jun 2008 14:06:15 +0200
From: Andi Kleen <andi@firstfloor.org>
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To: Andrew Morton <akpm@linux-foundation.org>
CC: Paul Mundt <lethal@linux-sh.org>, Rik van Riel <riel@redhat.com>,
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       Ingo Molnar <mingo@elte.hu>, Andy Whitcroft <apw@shadowen.org>
Subject: Re: [PATCH -mm 13/25] Noreclaim LRU Infrastructure
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> Andi has suggested that we can remove the node-ID encoding from
> page.flags on x86 because that info is available elsewhere, although a
> bit more slowly.
> 
> <looks at page_zone(), wonders whether we care about performance anyway>

It would be just pfn_to_nid(page_pfn(page)) for 32bit && CONFIG_NUMA.
-sh should have that too.

Only trouble is that it needs some reordering because right now page_pfn
is not defined early enough.

> There wouldn't be much point in doing that unless we did it for all
> 32-bit architectures.  How much trouble would it cause sh?

Probably very little from a quick look at the source.

-Andi
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