Xen devel - Mar 2009 - [PATCH 0/3] update cpufreq aperf and mperf so that it can support both governor and user application

Update cpufreq aperf and mperf, so that it can be used by both ondemand gov and
user program.

Current xen cpufreq read aperf and mperf MSR and then clear them for the sake of
ondemand governor. This solution block user program to get aperf and mperf on
their purpose.
This patch no longer clear aperf and mperf MSR, so that it can be used by both
ondemand gov and user program.
It also add sysctl hypercall, deliver cpu actual average frequence information
to libxc.
It also add related item to xenpm tools.

Thanks,
Jinsong
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