Re: EDF - "earliest deadline first" scheduler

[Henrik Austad <henrik@austad.us>]

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On Mon, Apr 03, 2017 at 08:06:23AM +0300, Ran Shalit wrote:
> On Mon, Apr 3, 2017 at 5:38 AM, Alison Chaiken <alison@peloton-tech.com> wrote:
> >  Ran Shalit <ranshalit@gmail.com> wrote:
> >> I have found in
> >> https://wiki.linuxfoundation.org/realtime/documentation/howto/applications/cyclic
> >> that there is EDF scheduler option for creating a periodic RT thread.
> >> Yet, I could not understand what's behind the EDF scheduler
> >
> >
> > Have a look at "Using SCHED_DEADLINE" at
> >
> > http://elinux.org/ELC_Europe_2016_Presentations
> >
> > Also, look for papers on this topic by Juri Lelli.
> >
> > HTH,
> > Alison
> 
> Hi Alison,
> 
> Thank you very much.
> I reviewed the material, which is very interesting, but I am not yet
> sure which timer are used internally in SCHED_DEADLINE.
> Is it posix or non-posix ?

A "posix-timer" is a userspace-construct. A posix-timer will use the 
hrtimer in the kernel - which ends up in the same subsystem used by the 
deadline scheduler.

-- 
Henrik Austad

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