Re: [PATCH 2/5] Light Fragmentation Avoidance V20: 002_usemap

From: Mel Gorman
Date: Tue Nov 22 2005 - 05:35:30 EST

On Tue, 22 Nov 2005, Andi Kleen wrote:

> > 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.

PG_unchecked appears to be totally unused. It's only users are the macros
that manipulate the bit and mm/page_alloc.c . It appears it has been a
long time since it was used to it is a canditate for reuse.

Mel Gorman
Part-time Phd Student Java Applications Developer
University of Limerick IBM Dublin Software Lab
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