On Sat, Jul 24, 2010 at 12:10:49AM +0900, KOSAKI Motohiro wrote: > > The zone->lru_lock is heavily contented in workload where activate_page() > > is frequently used. We could do batch activate_page() to reduce the lock > > contention. The batched pages will be added into zone list when the pool > > is full or page reclaim is trying to drain them. > > > > For example, in a 4 socket 64 CPU system, create a sparse file and 64 processes, > > processes shared map to the file. Each process read access the whole file and > > then exit. The process exit will do unmap_vmas() and cause a lot of > > activate_page() call. In such workload, we saw about 58% total time reduction > > with below patch. > > I'm not sure this. Why process exiting on your workload call unmap_vmas? Trick question? Getting rid of a mm on process exit requires unmapping the vmas. -Andi -- 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>