Messages in this thread | | | Subject | Re: [PATCH 0/8] Avoiding fragmentation with subzone groupings v25 | From | Peter Zijlstra <> | Date | Fri, 08 Sep 2006 10:30:32 +0200 |
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On Thu, 2006-09-07 at 17:58 -0700, Andrew Morton wrote: > On Thu, 7 Sep 2006 20:03:42 +0100 (IST) > Mel Gorman <mel@csn.ul.ie> wrote: > > > When a page is allocated, the page-flags > > are updated with a value indicating it's type of reclaimability so that it > > is placed on the correct list on free. > > We're getting awful tight on page-flags. > > Would it be possible to avoid adding the flag? Say, have a per-zone bitmap > of size (zone->present_pages/(1<<MAX_ORDER)) bits, then do a lookup in > there to work out whether a particular page is within a MAX_ORDER clump of > easy-reclaimable pages?
That would not actually work, the fallback allocation path can move blocks smaller than MAX_ORDER to another recaim type.
But yeah, page flags are getting right, perhaps Rafael can use his recently introduced bitmaps to rid us of the swsusp flags?
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