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Date: Tue, 22 Nov 2005 11:22:37 +0100
From: Andi Kleen <ak@suse.de>
To: Andy Whitcroft <apw@shadowen.org>
Cc: Mel Gorman <mel@csn.ul.ie>, Andi Kleen <ak@suse.de>, linux-mm@kvack.org,
       mingo@elte.hu, lhms-devel@lists.sourceforge.net,
       linux-kernel@vger.kernel.org, nickpiggin@yahoo.com.au
Subject: Re: [PATCH 2/5] Light Fragmentation Avoidance V20: 002_usemap
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References: <20051115164946.21980.2026.sendpatchset@skynet.csn.ul.ie> <200511160036.54461.ak@suse.de> <Pine.LNX.4.58.0511160137540.8470@skynet> <200511160252.05494.ak@suse.de> <Pine.LNX.4.58.0511160200530.8470@skynet> <4382EF48.1050107@shadowen.org>
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> All of that said, I am not even sure we have a bit left in the page
> flags on smaller architectures :/.

How about

#define PG_checked               8      /* kill me in 2.5.<early>. */

?

At least PG_uncached isn't used on many architectures too, so could
be reused. I don't know why those that use it don't check VMAs instead.

-Andi