The wake-up calculation used is this:
for (i = 0; i < 8; i++)
if (cur_usage[i])
totalevents += cur_usage[i] - last_usage[i];
where the cur_usage is the number of times C-state i has been entered.
Unfortunately, C0 does not produce usage stats.
This algorithm would seem to produce the wrong result when
transitioning between lower C-states occurs. It does not count
wake-ups at all.
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