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@xxxxxxx> 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@xxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>