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    SubjectRe: [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from kswapd
    On Thu, Jul 21, 2011 at 05:28:50PM +0100, Mel Gorman wrote:
    > Assuming that flusher threads will always write back dirty pages promptly
    > then it is always faster for reclaimers to wait for flushers. This patch
    > prevents kswapd writing back any filesystem pages.
    >
    > Signed-off-by: Mel Gorman <mgorman@suse.de>

    Relying on the flushers may mean that every dirty page in the system
    has to be written back before the pages from the zone of interest are
    clean.

    De-facto we have only one mechanism to stay on top of the dirty pages
    from a per-zone perspective, and that is single-page writeout from
    reclaim.

    While we all agree that this sucks, we can not remove it unless we
    have a replacement that makes zones reclaimable in a reasonable time
    frame (or keep them reclaimable in the first place, what per-zone
    dirty limits attempt to do).

    As such, please include

    Nacked-by: Johannes Weiner <jweiner@redhat.com>


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