sched/fair: documentation on fair server sysfs interface?

sched/fair: documentation on fair server sysfs interface?

[Chris Friesen]

Hi,

I'm not subscribed, please CC me on replies.

Is there any documentation available on how 
/sys/kernel/debug/sched/fair_server/cpuX/period and 
/sys/kernel/debug/sched/fair_server/cpuX/runtime are expected to be used 
and what behaviour should result?

I'm especially curious about the interactions with SCHED_FIFO and 
SCHED_DEADLINE tasks.

I had been using RT throttling to protect "regular" tasks from 
SCHED_FIFO tasks trying to hog the entire CPU, and it seems that doesn't 
work the same in 6.12.

What is the recommended way in 6.12 to have a realtime task that is 
effectively a CPU hog, and non-realtime tasks that sometimes need to 
run.   I'd like the realtime task to have as much CPU as possible, but 
not be able to totally starve out the non-realtime task.

Thanks,
Chris