On Fri, 22 Oct 2010, Christoph Hellwig wrote: > > I think making shrinking decision per-zone is fine. But do we need to > duplicate all the lru lists and infrastructure per-zone for that instead > of simply per-zone? Even with per-node lists we can easily skip over > items from the wrong zone. > > Given that we have up to 6 zones per node currently, and we would mostly > use one with a few fallbacks that seems like a lot of overkill. Zones can also cause asymmetry in reclaim if per zone reclaim is done. Look at the following zone setup of a Dell R910: grep "^Node" /proc/zoneinfo Node 0, zone DMA Node 0, zone DMA32 Node 0, zone Normal Node 1, zone Normal Node 2, zone Normal Node 3, zone Normal A reclaim that does per zone reclaim (but in reality reclaims all objects in a node (or worse as most shrinkers do today in the whole system) will put 3x the pressure on node 0. -- 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>