Messages in this thread | | | Date | Thu, 18 Nov 2010 16:08:01 +0000 | From | Mel Gorman <> | Subject | Re: [PATCH 45 of 66] remove PG_buddy |
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On Wed, Nov 03, 2010 at 04:28:20PM +0100, Andrea Arcangeli wrote: > From: Andrea Arcangeli <aarcange@redhat.com> > > PG_buddy can be converted to _mapcount == -2. So the PG_compound_lock can be > added to page->flags without overflowing (because of the sparse section bits > increasing) with CONFIG_X86_PAE=y and CONFIG_X86_PAT=y. This also has to move > the memory hotplug code from _mapcount to lru.next to avoid any risk of > clashes. We can't use lru.next for PG_buddy removal, but memory hotplug can use > lru.next even more easily than the mapcount instead. >
Does this make much of a difference? I confess I didn't read the patch closely because I didn't get the motivation.
-- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab
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