On Thu, Jul 07, 2016 at 11:42:15AM +0200, Peter Zijlstra wrote: > I suspect you want something like so; except this has holes in. > > We clear KVM_ST_PAD_PREEMPT before disabling preemption and we set it > after enabling it, this means that if we get preempted in between, the > vcpu is reported as running even though it very much is not. > > Fixing that requires much larger surgery. Note that this same hole is already a 'problem' for steal time accounting. The thread can accrue further delays (iow steal time) after we've called record_steal_time(). These delays will go unaccounted. -- 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
