Messages in this thread | | | Subject | Re: [PATCH RFC 1/2] kvm: Handle undercommitted guest case in PLE handler | From | Peter Zijlstra <> | Date | Thu, 04 Oct 2012 15:07:18 +0200 |
| |
On Thu, 2012-10-04 at 14:41 +0200, Avi Kivity wrote: > > Again the numbers are ridiculously high for arch_local_irq_restore. > Maybe there's a bad perf/kvm interaction when we're injecting an > interrupt, I can't believe we're spending 84% of the time running the > popf instruction.
Smells like a software fallback that doesn't do NMI, hrtimer based sampling typically hits popf where we re-enable interrupts.
| |