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Subject: Re: [RFC][PATCH 02/22] sched: add extended scheduling interface
From: Raistlin <raistlin@linux.it>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>,
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On Fri, 2010-11-12 at 11:38 -0500, Steven Rostedt wrote:
> A while ago I implemented an EDF scheduler for a client (before working
> with Red Hat), and one thing they asked about was having a "soft group",
> which was basically: This group is guaranteed X runtime in Y period, but
> if the system is idle, let the group run, even if it has exhausted its X
> runtime.
>=20
Sounds reasonable...

> Is this supported?
>=20
Yep, as both Tommaso and Peter were saying, patch 18 gives you exactly
that. In some more details, after X is over, you can chose (just by
setting a flag in sched_param2 and calling setscheduler2()) if you want
to keep running as a -deadline task (but without hurting other -deadline
tasks), or if you want to still be able to compete for CPU, but as a -rt
or -fair task.

However, we're delaying this for now. It won't be hard to add it back if
we change our mind. :-)

Thanks,
Dario

--=20
<<This happens because I choose it to happen!>> (Raistlin Majere)
----------------------------------------------------------------------
Dario Faggioli, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa  (Italy)

http://blog.linux.it/raistlin / raistlin@ekiga.net /
dario.faggioli@jabber.org

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