Re: Delayed acpi frequency governor call

[Philipp Miedl <philipp.miedl@tik.ee.ethz.ch>]

On 25.01.2017 04:23, Viresh Kumar wrote:
> On 24-01-17, 15:49, Philipp Miedl wrote:
>> Can you please describe how things changed from version 4.4 to 4.9 - I'm not
>> sure if I understand correctly.
>> Before 4.7 the governor was just running as a kernel process and triggered
>> by the (free running) timers and
>> now its hooked with the scheduler. So the scheduler ensures that the
>> governor work is not delayed?!
> Now the cpufreq callbacks gets called from within the scheduler every few
> milliseconds. And once we have crossed the sampling-rate time, we reevaluate the
> frequency. Though ondemand/conservative governors still used workqueue until
> very recently for most of the platforms. Recently it is replaced by a RT thread.
>

Ok got it now. Thanks a lot for your help!

-- 
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|  Philipp Miedl                                                   |
|  PhD Student @ Computer Engineering and Networks Laboratory      |
|  ETH Zurich, ETZG76, Gloriastrasse 35, 8092 Zurich, Switzerland  |
|  mail: philipp.miedl@ee.tik.ethz.ch      phone: +41 44 632 70 61 |
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