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    SubjectRe: [PATCH 52 of 66] enable direct defrag
    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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