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    SubjectRe: [PATCH 1/6] mm: kswapd: Stop high-order balancing when any suitable zone is balanced
    On Thu, 09 Dec 2010, Mel Gorman wrote:

    > When the allocator enters its slow path, kswapd is woken up to balance the
    > node. It continues working until all zones within the node are balanced. For
    > order-0 allocations, this makes perfect sense but for higher orders it can
    > have unintended side-effects. If the zone sizes are imbalanced, kswapd may
    > reclaim heavily within a smaller zone discarding an excessive number of
    > pages. The user-visible behaviour is that kswapd is awake and reclaiming
    > even though plenty of pages are free from a suitable zone.
    > This patch alters the "balance" logic for high-order reclaim allowing kswapd
    > to stop if any suitable zone becomes balanced to reduce the number of pages
    > it reclaims from other zones. kswapd still tries to ensure that order-0
    > watermarks for all zones are met before sleeping.
    > Signed-off-by: Mel Gorman <>

    Looks good to me.

    Reviewed-by: Eric B Munson <>
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