Re: [Xen-devel] [PATCH] 1/2: cpufreq/PowerNow! in Xen: Time and platform changes

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

>Here is the missing piece of the puzzle.   A platform
>hypercall operation to get system wide idle time.

Two things I'm not clear about here:
- How is the caller going to be able to associate the logical CPU numbers
  returned with vCPU numbers?
- How is the caller supposed to deal with logical CPUs it has no vCPU for?

I continue to think that it is not reasonable to expect vCPUs to be pinned just
for the purpose of doing frequency control (and even then I don't think there's
a guaranteed association between vCPU and logical CPU numbers), as much
as I don't think it is a good idea to require dom0 to have as many vCPUs as
there are logical CPUs (which isn't even possible on systems with >32 logical
CPUs).

Jan


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