On Sun, Aug 12, 2012 at 04:40:48PM +0300, Avi Kivity wrote:
> On 08/12/2012 04:25 PM, Gleb Natapov wrote:
>
> >> How expensive is this? We may want a follow-on patch to cache it in a
> >> per-cpu variable.
> >>
> > I have patches ready. I couldn't measure any overhead of the
> > rdmsr(MSR_IA32_DEBUGCTLMSR).
> >
>
> Do you mean while running kvm? How about just running it in a loop?
>
No, I mean running it in a loop. Loop with or without
rdmsr(MSR_IA32_DEBUGCTLMSR) takes the same time as measured by rdtsc.
--
Gleb.
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