There's another paper from an iwp9 http://9p.io/iwp9/Real-time.pdf that
might provide more detail

On Tue, 29 Aug 2023 at 18:19, <ori@eigenstate.org> wrote:

> Quoth dusan3sic@gmail.com:
> > I was reading an article about plan9's realtime scheduler edf (
> http://doc.cat-v.org/plan_9/real_time/real_time_in_a_real_operating_system/real_time_in_a_real_operating_system.pdf,
> page 7), and they mentioned using /dev/realtime to create realtime
> processes, but /dev/realtime doesn't exist on my machine (I am using
> 9front). I found a post here from 07 saying something about removing it a
> long time ago, but it got no answers.
> >
> > In proc(3) they mention some commands for configuring realtime processes
> but I don't know if that is to configure an already made realtime process
> or to make one from a regular. How do i make realtime processes in these
> days?
> 
> it's the bits you found in /proc; there are no (longer?)
> any special real time processes; any process can become
> real time by setting up deadlines at any point.
> 
> /dev/realtime isn't needed any more.
> 
> unfortunately, I'm not aware of any programs using it.
> 
> (that may be a good question for the list: where was the
> real time scheduler used, and does any code using it
> survive?)
> 

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