Messages in this thread |  | | Date | Tue, 06 Feb 2007 15:50:54 -0800 | From | Zachary Amsden <> | Subject | Re: [PATCH 2/11] Sched clock paravirt op |
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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.
Zach
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