Xen devel - Dec 2008 - [PATCH 1] Add cpufreq governors: performance, powersave, userspace

Add cpufreq governors: performance, powersave, userspace

This patch add 3 more governors beside original running ondemand cpufreq
governor.
performance governor is with best performance, keeping cpu always running at
highest freq;
powersave governor is with best power save effect, keeping cpu always running at
lowest freq;
userspace governor provide user setting freq ability;

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

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