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Date: Thu, 30 Aug 2018 10:24:53 +0200 From: Daniel Lezcano <daniel.lezcano@...aro.org> To: Ulf Hansson <ulf.hansson@...aro.org> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Linux PM mailing list <linux-pm@...r.kernel.org> Subject: Re: [RFD] Add debugfs for cpuidle ? On 30/08/2018 10:22, Ulf Hansson wrote: > On 24 May 2018 at 10:47, Daniel Lezcano <daniel.lezcano@...aro.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. Yes, I have a draft version, a bit incomplete but easy to fill. I'm just not fully convinced about the metrics we need yet. -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog
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