On Thu, 11 Oct 2012, Rik van Riel wrote: > These statistics are updated at page fault time, I > believe while holding the page table lock. > > In other words, they are in code paths where updating > the stats should not cause issues. The per cpu counters in the VM were introduced because of counter contention caused at page fault time. This is the same code path where you think that there cannot be contention. -- 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>