While looking for something else entirely I spotted two small issues in the page fault fast path. Enabling memcg takes the RCU read lock unnecessarily even when the task is not part of a memcg and we fiddle with RSS stats more than necessary. Details in the patches. include/linux/memcontrol.h | 8 ++++++++ include/linux/mm_types.h | 1 - mm/memory.c | 32 +++++++++++++------------------- 3 files changed, 21 insertions(+), 20 deletions(-) -- 1.8.4.5 -- 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>