On Fri, 29 Oct 2010, Andrew Morton wrote: > > Doing that caused cache misses in the past and reduced the performance of > > the ZVCs. This way the threshold is in the same cacheline as the > > differentials. > > This sounds wrong. As long as that threshold isn't stored in a > cacheline which other CPUs are modifying, all CPUs should be able to > happily cache it. Maybe it needed a bit of padding inside the zone > struct. High speed cpu caches are a very scarce resource. The differentials are not in the zone struct. Tried to put it onto a single cacheline. Even that did not do the trick for the large configurations. The same optimizations are done in the slab allocators by the way. Use of the percpu_counter() would at least quadruple the cache footprint in use for the counters. percpu_counters() is using s32 and not s8. -- 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>