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SubjectRe: [PATCH RFC 1/2] kvm: Handle undercommitted guest case in PLE handler
On Tue, 25 Sep 2012 10:12:49 +0200
Avi Kivity <avi@redhat.com> wrote:

> It will. The tradeoff is between false-positive costs (undercommit) and
> true positive costs (overcommit). I think undercommit should perform
> well no matter what.
>
> If we utilize preempt notifiers to track overcommit dynamically, then we
> can vary the spin time dynamically. Keep it long initially, as we get
> more preempted vcpus make it shorter.

What will happen if we pin each vcpu thread to some core?
I don't want to see so many vcpu threads moving around without
being pinned at all.

In that case, we don't want to make KVM do any work of searching
a vcpu thread to yield to.

Thanks,
Takuya


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