Messages in this thread | | | From | Ulf Hansson <> | Date | Thu, 30 Aug 2018 10:22:55 +0200 | Subject | Re: [RFD] Add debugfs for cpuidle ? |
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On 24 May 2018 at 10:47, Daniel Lezcano <daniel.lezcano@linaro.org> wrote: > On 24/05/2018 10:28, Rafael J. Wysocki wrote: >> On Thursday, May 24, 2018 10:14:31 AM CEST Daniel Lezcano wrote: >>> >>> Hi all, >> >> Hi, >> >>> would it be interesting to add debugfs metrics for cpuidle in order >>> to read some statistics from there and investigate the behavior ? >> >> What exactly would you like to see in there? > > It could be interesting to have statistics on a per cpu and global basis > for: > > - prediction accuracy: > > /sys/kernel/debug/cpuidle/prediction/[good|over|under] > /sys/kernel/debug/cpuidle/cpu*/state*/prediction/[good|over|under] > > - exit latency > > In addition, it is often the case the idle states values are dropped > randomly, it is interesting to see the average exit latency for the > states. That could give also an indication the cluster idle state success. > > /sys/kernel/debug/cpuidle/state*/latency/[min|max|avg|stddev] > /sys/kernel/debug/cpuidle/cpu*/state*/prediction/[min|max|avg|stddev] > > And perhaps more information like the tick stopped stat ? >
Daniel,
Any chance that you have some draft version of actual code implementing this?
I would be very interested to try then - or help out to implement this, in case you haven't started yet.
Kind regards Uffe
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