On Fri, 2008-07-11 at 09:34 +0200, Carsten Otte wrote: > Avi Kivity wrote: > > What is the overhead of ktime_get()? > I think I'd like an arch specific timestamp. This way we could use our > clock-cycle-granularity-non-privileged-timestamp instruction ;-). If > we need a common implementation, I don't think there's much difference > between different syscalls in terms of overhead. Carsten tried to elaborate on IRC, but the summary is that a) time on S390 is complicated, and b) they have a time source that yields finer granularity than nanoseconds. So I'm inclined to say fine, we can have an arch-specific hook, and almost every arch will just use getnstimeofday(). -- Hollis Blanchard IBM Linux Technology Center -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
