On 01/21/2013 10:38 AM, H. Peter Anvin wrote: > Final question: are any of these done in frequent paths? (I believe no, but...) Nope. All of the places that it gets used here are in initialization-time paths. The two we have here are when kvm and the host are setting up a new vcpu and when the kvmclock clocksource is being registered. A CPU getting hotplugged is the only thing that might even have these get called more than at boot. -- 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>