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    SubjectRe: [PATCH 2/7] vmscan: synchronous lumpy reclaim don't call congestion_wait()
    On Thu, Aug 05, 2010 at 03:13:03PM +0900, KOSAKI Motohiro wrote:
    > congestion_wait() mean "waiting quueue congestion is cleared".
    > That said, if the system have plenty dirty pages and flusher thread push
    > new request to IO queue conteniously, IO queue are not cleared
    > congestion status for long time. thus, congestion_wait(HZ/10) become
    > almostly equivalent schedule_timeout(HZ/10).
    > However, synchronous lumpy reclaim donesn't need this
    > congestion_wait() at all. shrink_page_list(PAGEOUT_IO_SYNC) are
    > using wait_on_page_writeback() and it provide sufficient waiting.
    > Signed-off-by: KOSAKI Motohiro <>
    Reviewed-by: Minchan Kim <>

    Kind regards,
    Minchan Kim

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