On Fri, Jun 25, 2010 at 06:13:20PM +0900, KOSAKI Motohiro wrote: > shrink_zones() need relatively long time. and lru_pages can be > changed dramatically while shrink_zones(). > then, lru_pages need recalculate on each priority. In the direct reclaim path, we bail out of that loop after SWAP_CLUSTER_MAX reclaimed pages, so in this case, decreasing priority levels actually mean we do _not_ make any progress and the total number of lru pages should not change (much). The possible distortion in shrink_slab() is small. However, for the suspend-to-disk case the reclaim target can be a lot higher and we inevitably end up at higher priorities even though we make progress, but fail to increase pressure on the shrinkers as well without your patch. Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>