On 08/05/2010 02:13 AM, 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<kosaki.motohiro@xxxxxxxxxxxxxx>
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