This attribute is not present if the scaling driver in use does not
support it.
+``cpuinfo_cur_freq``
+ Current frequency of the CPUs belonging to this policy as obtained from
+ the hardware (in KHz).
+
+ This is expected to be the frequency the hardware actually runs at.
+ If that frequency cannot be determined, this attribute should not
+ be present.
+
``cpuinfo_max_freq``
Maximum possible operating frequency the CPUs belonging to this policy
can run at (in kHz).