Messages in this thread | | | Date | Tue, 28 Jun 2005 13:45:22 +0100 | From | Andy Whitcroft <> | Subject | Re: [patch 2] mm: speculative get_page |
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Nick Piggin wrote:
> #define PG_free 20 /* Page is on the free lists */ > +#define PG_freeing 21 /* PG_refcount about to be freed */
Wow this needs two new page bits. That might be a problem ongoing. There are only 24 of these puppies and this takes us to just two remaining. Do we really need _two_ to track free?
One obvious area of overlap might be the PG_nosave_free which seems to be set on free pages for software suspend. Perhaps that and PG_free will be equivalent in intent (though maintained differently) and allow us to recover a bit?
There are a couple of bits which imply ownership such as PG_slab, PG_swapcache and PG_reserved which to my mind are all exclusive. Perhaps those plus the PG_free could be combined into a owner field. I am unsure if the PG_freeing can be 'backed out' if not it may also combine?
Mumble ...
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