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SubjectRe: [PATCH 2/11] Sched clock paravirt op
Jeremy Fitzhardinge wrote:
> Zachary Amsden wrote:
>> Jeremy Fitzhardinge wrote:
>>> Zachary Amsden wrote:
>>>> Scheduled (or available) time and real time are good notions. Stolen
>>>> time is debatable. But TSC is basically just always wrong. That's
>>>> why I don't want to overload the rdtsc operation.
>>> Well, in the Xen case it is actually guaranteed to be correct and useful
>>> as real time, but that's definitely not something we can expect in
>>> general. But you're talking specifically about schedulable vcpu time
>>> here, right?
>> Not schedulable time, scheduled time (schedulable - scheduled) = stolen
> I meant "schedulable" (perhaps "usable" would be better) from the
> guest's perspective: total amount of real cpu time each vcpu gets. ie:
> (real - schedulable) = stolen. So I think we're talking about the same
> thing.

Yes, I think so. The point though, is the for Xen, TSC is real time.
So it won't do for the scheduler, which must be schedulable time.


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