Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to SCHED_FIFO task

Hi,

On 11/11/2016 11:22, Viresh Kumar wrote:

If slow path frequency changes are conducted in a SCHED_OTHER context then they may be delayed for some amount of time, including indefinitely, when real time or deadline activity is taking place.

Move the slow path to a real time kernel thread. In the future the thread should be made SCHED_DEADLINE.

would you have an insight, as to what runtime/deadline/period to set, and/or what specific timing constraints you'd like to set, just for this cpufreq slowpath work?

The RT priority is arbitrarily set to 50 for now.

[...]

• struct sched_param param = { .sched_priority = 50 };

won't you have a tunable here? (sysctl?)

Thanks,

T.