Xen devel - Jun 2007 - [PATCH] export cpu idle time to guests

The attached patch exports cpu idle time to guests.  This is one of
the things necessary for cpu frequency scaling to work well.

It works, but has the problem that the sysctl hypercall is really
only designed to be used from userspace, so we would need a userspace
cpufreq daemon running in dom0.

Mark, does this look reasonable to you?

Signed-off-by: Rik van Riel <riel@redhat.com>

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> The attached patch exports cpu idle time to guests.  This is one of
> the things necessary for cpu frequency scaling to work well.
> 
> It works, but has the problem that the sysctl hypercall is really
> only designed to be used from userspace, so we would need a userspace
> cpufreq daemon running in dom0.
> 
> Mark, does this look reasonable to you?
As a first pass toward enabling a solution, it looks acceptable.
It should be trivial to enable cpuspeed or powersave to use
a different call when running on dom0.

In the long run, I''d like to get ondemand working in dom0 so
that people don''t need to do anything special to get cpufreq
support.

-Mark Langsdorf
Operating System Research Center
AMD



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