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    SubjectRe: [PATCH] vmscan: bail out of page reclaim after swap_cluster_max pages
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    > Sometimes the VM spends the first few priority rounds rotating back
    > referenced pages and submitting IO. Once we get to a lower priority,
    > sometimes the VM ends up freeing way too many pages.
    >
    > The fix is relatively simple: in shrink_zone() we can check how many
    > pages we have already freed, direct reclaim tasks break out of the
    > scanning loop if they have already freed enough pages and have reached
    > a lower priority level.
    >
    > However, in order to do this we do need to know how many pages we already
    > freed, so move nr_reclaimed into scan_control.
    >
    > Signed-off-by: Rik van Riel <riel@redhat.com>
    > ---
    > Kosaki, this should address the zone scanning pressure issue.

    hmmmm. I still don't like the behavior when priority==DEF_PRIORITY.
    but I also should explain by code and benchmark.

    therefore, I'll try to mesure this patch in this week.

    thanks.




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