Re: [RFD] Add debugfs for cpuidle ?
From: Ulf Hansson
Date: Thu Aug 30 2018 - 04:22:58 EST
On 24 May 2018 at 10:47, Daniel Lezcano <daniel.lezcano@xxxxxxxxxx> 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,
>>> 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
> - prediction accuracy:
> - 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.
> And perhaps more information like the tick stopped stat ?
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.