cpufreq dir under /sys/devices/system/cpu/cpu* is not present for online=0 cpus

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I am learning android and finding that the cpufreq dir under
/sys/devices/system/cpu/cpu* is not present when online=0 for a cpu. Why are
we hiding those directory and its content when a cpu goes offline/power
collapse ?

Because of the above, the cpu usage is not very accurate from some tools
which reads data from sysfs.

Thanks,
Ragu

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