[Bug 69821] setting CONFIG_HZ_PERIODIC locks cpu at the lowest frequency using ONDEMAND

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--- Comment #4 from Chen Yu <yu.c.chen@xxxxxxxxx> ---
CONFIG_NO_HZ_FULL  is using ktime_get to get the idle time in
get_cpu_idle_time_us, it is based on clock source,  while if the kernel config
is set with CONFIG_HZ_PERIODIC , the governor might get idle time by
jiffies(tick, minimum unit of 4 millisecond),
the former is more accurate than the latter, this might be one of the reason
for the problem. I can try to reproduce and take a look.

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