On Mon, 2011-09-26 at 09:54 +0300, Pekka Enberg wrote: > > AFAICT, flush_all() isn't all that performance sensitive. Why do we > want to reduce IPIs here? Because it can wake up otherwise idle CPUs, wasting power. Or for the case I care more about, unnecessarily perturb a CPU that didn't actually have anything to flush but was running something, introducing jitter. on_each_cpu() things are bad when you have a ton of CPUs (which is pretty normal these days). -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href