Re: [PATCH V6 3/6] sched/fair: Fair server interface

[Peter Zijlstra <peterz@infradead.org>]

On Fri, Apr 05, 2024 at 07:28:02PM +0200, Daniel Bristot de Oliveira wrote:
> Add an interface for fair server setup on debugfs.
> 
> Each CPU has three files under /debug/sched/fair_server/cpu{ID}:
> 
>  - runtime: set runtime in ns
>  - period:  set period in ns
>  - defer:   on/off for the defer mechanism
> 
> This then leaves /proc/sys/kernel/sched_rt_{period,runtime}_us to set
> bounds on admission control.
> 
> The interface also add the server to the dl bandwidth accounting.

I suppose most people will want to use it like:

  for i in /debug/sched/fair_server/cpu*
  do
	  echo $PERIOD > ${i}/period
	  ecoh $RUNTIME > ${i}/runtime
  done

And I think we agreed to keep this loop in userspace, but memory is
vague.

The 'defer' thing is dubious though, I don't suppose anybody would ever
want to actually change that, other than you while poking around at this
code, right?