On 01/29/18 10:26, Andy Lutomirski wrote: >>> >>> That will utterly suck on non-UMIP machines that have >>> hypervisor-provided UMIP emulation. >> >> Is that a valid thing to optimize for, especially given that paranoid >> entries aren't the most common anyway? > > A bunch of people seem to care about NMI performance for perf. > That wasn't really the question... > And the current patch set works without this trick. But I believe the tricks it uses are fragile. > FWIW, if we switch all entries to the entry text trampoline, we get direct percpu access for free. That might be a better option. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
