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    SubjectRe: [PATCH 5/5] vmscan: Take order into consideration when deciding if kswapd is in trouble
    On Fri, Nov 13, 2009 at 4:30 AM, Mel Gorman <> wrote:
    > If reclaim fails to make sufficient progress, the priority is raised.
    > Once the priority is higher, kswapd starts waiting on congestion.
    > However, on systems with large numbers of high-order atomics due to
    > crappy network cards, it's important that kswapd keep working in
    > parallel to save their sorry ass.
    > This patch takes into account the order kswapd is reclaiming at before
    > waiting on congestion. The higher the order, the longer it is before
    > kswapd considers itself to be in trouble. The impact is that kswapd
    > works harder in parallel rather than depending on direct reclaimers or
    > atomic allocations to fail.
    > Signed-off-by: Mel Gorman <>

    It's make sense to me.
    It can help high order atomic allocation which is a big problem of allocator. :)

    Thanks Mel.

    Reviewed-by: Minchan Kim <>

    Kind regards,
    Minchan Kim

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