Xen devel - Dec 2008 - [PATCH] Set xen as default cpufreq, set userspace as default governor, add governor option at cmdline

Set xen as default cpufreq, set userspace as default governor, add governor
option at cmdline

Set userspace governor as default, which stays same effect
as when cpufreq in xen is not enabled. As a result, enable cpufreq
in xen by default to avoid reboot to activate cpufreq. Now it''s
always on but w/o performance impact if user doesn''t tempt
to change governor.

Add governor option at cmdline, add some warning info for debug.

Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>

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