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. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
