On Sat, 5 Sep 2015, Jesper Dangaard Brouer wrote: > The double_cmpxchg without lock prefix still cost 9 cycles, which is > very fast but still a cost (add approx 19 cycles for a lock prefix). > > It is slower than local_irq_disable + local_irq_enable that only cost > 7 cycles, which the bulking call uses. (That is the reason bulk calls > with 1 object can almost compete with fastpath). Hmmm... Guess we need to come up with distinct version of kmalloc() for irq and non irq contexts to take advantage of that . Most at non irq context anyways. -- 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>