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SubjectRe: [PATCH] Track accurate idle time with tick_sched.idle_sleeptime
> at least the current out-of-idle code already does what amounts to a 
> PM-timer read when exiting from C2 or C3 mode. The

C2/C3 are already slow. I more worry about C1.

Also doing two instead of one can have an impact even on C2+, especially
when the operation can be thousands of cycles.

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