On 11/09/2013 09:37 AM, Mel Gorman wrote: > Commit 0255d491 (mm: Account for a THP NUMA hinting update as one PTE > update) was added to account for the number of PTE updates when marking > pages prot_numa. task_numa_work was using the old return value to track > how much address space had been updated. Altering the return value causes > the scanner to do more work than it is configured or documented to in a > single unit of work. > > This patch reverts 0255d491 and accounts for the number of THP updates > separately in vmstat. It is up to the administrator to interpret the pair > of values correctly. This is a straight-forward operation and likely to > only be of interest when actively debugging NUMA balancing problems. > > The impact of this patch is that the NUMA PTE scanner will scan slower when > THP is enabled and workloads may converge slower as a result. On the flip > size system CPU usage should be lower than recent tests reported. This is > an illustrative example of a short single JVM specjbb test Reviewed-by: Rik van Riel <riel@xxxxxxxxxx> -- All rights reversed -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>