On Thu, 11 Dec 2014, Jesper Dangaard Brouer wrote: > I was expecting to see at least (specifically) 4.291 ns improvement, as > this is the measured[1] cost of preempt_{disable,enable] on my system. Right. Those calls are taken out of the fastpaths by this patchset for the CONFIG_PREEMPT case. So the numbers that you got do not make much sense to me. -- 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>