Date: Thu, 10 Nov 2005 02:33:24 +0000 (GMT)
From: Hugh Dickins <hugh@veritas.com>
To: Andrew Morton <akpm@osdl.org>
cc: nickpiggin@yahoo.com.au, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 10/15] mm: atomic64 page counts
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On Wed, 9 Nov 2005, Andrew Morton wrote:
> 
> hm.   I thought we were going to address this by
> 
> a) checking for an insane number of mappings of the same page in the
>    pagefault handler(s) and 
> 
> b) special-casing ZERO_PAGEs on the page unallocator path.
> 
> That'll generate faster and smaller code than adding an extra shift and
> possibly larger constants in lots of places.

I think we all had different ideas of how to deal with it.

When I outlined this method to you, you remarked "Hmm" or something
like that, which I agree didn't indicate great enthusiasm!

I'm quite pleased with the way it's worked out, but you were intending
that the 64-bit arches should get along with 32-bit counts?  Maybe.

Hugh
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