| Date | Thu, 18 Nov 2010 16:17:41 +0000 | From | Mel Gorman <> | Subject | Re: [PATCH 52 of 66] enable direct defrag |
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On Wed, Nov 03, 2010 at 04:28:27PM +0100, Andrea Arcangeli wrote: > From: Andrea Arcangeli <aarcange@redhat.com> > > With memory compaction in, and lumpy-reclaim removed, it seems safe enough to > defrag memory during the (synchronous) transparent hugepage page faults > (TRANSPARENT_HUGEPAGE_DEFRAG_FLAG) and not only during khugepaged (async) > hugepage allocations that was already enabled even before memory compaction was > in (TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG). >
While I'm hoping that my series on using compaction will be used instead of outright deletion of lumpy reclaim, this patch would still make sense.
Acked-by: Mel Gorman <mel@csn.ul.ie>
> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> > --- > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -28,6 +28,7 @@ > */ > unsigned long transparent_hugepage_flags __read_mostly = > (1<<TRANSPARENT_HUGEPAGE_FLAG)| > + (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)| > (1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG); > > /* default scan 8*512 pte (or vmas) every 30 second */ >
-- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab
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