On Wed, Jul 06, 2016 at 12:44:58PM +0200, Paolo Bonzini wrote: > > Paolo, could you help out with an (x86) KVM interface for this? > > If it's just for spin loops, you can check if the version field in the > steal time structure has changed. That would require remembering the old value, no? That would work with a previous interface proposal, see: http://lkml.kernel.org/r/1466937715-6683-2-git-send-email-xinhui.pan@xxxxxxxxxxxxxxxxxx the vcpu_get_yield_count() thing would match that I think. However the current proposal: http://lkml.kernel.org/r/1467124991-13164-2-git-send-email-xinhui.pan@xxxxxxxxxxxxxxxxxx dropped that in favour of only vcpu_is_preempted(), which requires being able to tell if a (remote) vcpu is currently running or not, which iirc, isn't possible with the steal time sequence count. -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
