Messages in this thread | | | Date | Fri, 3 Jul 2015 14:19:07 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH] sched,kvm: Fix KVM preempt_notifier usage |
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On Fri, Jul 03, 2015 at 01:12:11PM +0200, Paolo Bonzini wrote: > In fact you shouldn't have just tested the patch on a case _without_ > preemption notifiers, you should have also benchmarked the impact that > static keys have _with_ preemption notifiers. In a > not-really-artificial case (one single-processor guest running on the > host), the static key patch adds a static_key_slow_inc on a relatively > hot path for KVM, which is not acceptable.
Spawning the first vcpu is a hot path?
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