On Fri, 10 Dec 2010, Mel Gorman wrote: > When reclaiming for high-orders, kswapd is responsible for balancing a > node but it should not reclaim excessively. It avoids excessive reclaim by > considering if any zone in a node is balanced then the node is balanced. In > the cases where there are imbalanced zone sizes (e.g. ZONE_DMA with both > ZONE_DMA32 and ZONE_NORMAL), kswapd can go to sleep prematurely as just > one small zone was balanced. > > This alters the sleep logic of kswapd slightly. It counts the number of pages > that make up the balanced zones. If the total number of balanced pages is > more than a quarter of the zone, kswapd will go back to sleep. This should > keep a node balanced without reclaiming an excessive number of pages. > > Signed-off-by: Mel Gorman <mel@xxxxxxxxx> > Reviewed-by: Minchan Kim <minchan.kim@xxxxxxxxx> Reviewed-by: Eric B Munson <emunson@xxxxxxxxx>
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