RE: [linux-pm] [RFC-PATCH] Improve Menu Governor Prediction ofinterrupted C states.

[Woodruff, Richard]

Hi,

> I also found current cpuidle Menu governor should have some problems
> while predicting next non-expected break-event after some expected
> break-events. The measured_us/elapsed_us/predicted_us will become
> larger
> and larger once (measured_us + BREAK_FUZZ >= data->expected_us -
> target->exit_latency). The major point is that it should be
> last_residency, not measured_us, that need to be used to do comparing
> and distinguish between expected & non-expected events.
>
> Below is my draft patch (not tested) for this. It is simple and should
> also be effective for high interrupt rates case.

This does seem to give better guesses.  However, first tests are not showing as well as the irq time stamp version I posted.

I'll need to grab some hardware trace to see what is going on.

Thanks,
Richard W.

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