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    SubjectRe: [PATCH] sched,kvm: Fix KVM preempt_notifier usage
    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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