linux-kernel - Re: [RFC][PATCH 02/22] sched: add extended scheduling interface

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Message-ID: <1289589698.12418.443.camel@gandalf.stny.rr.com>
Date:	Fri, 12 Nov 2010 14:21:38 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Tommaso Cucinotta <tommaso.cucinotta@...up.it>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Raistlin <raistlin@...ux.it>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Chris Friesen <cfriesen@...tel.com>, oleg@...hat.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	Darren Hart <darren@...art.com>,
	Johan Eker <johan.eker@...csson.com>,
	"p.faure" <p.faure@...tech.ch>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Claudio Scordino <claudio@...dence.eu.com>,
	michael trimarchi <trimarchi@...is.sssup.it>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	Tommaso Cucinotta <cucinotta@...up.it>,
	Juri Lelli <juri.lelli@...il.com>,
	Nicola Manica <nicola.manica@...i.unitn.it>,
	Luca Abeni <luca.abeni@...tn.it>,
	Dhaval Giani <dhaval@...is.sssup.it>,
	Harald Gustafsson <hgu1972@...il.com>,
	paulmck <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 02/22] sched: add extended scheduling interface

On Fri, 2010-11-12 at 18:42 +0100, Tommaso Cucinotta wrote:
> Il 12/11/2010 17:38, Steven Rostedt ha scritto:
> > 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.
> >
> > Is this supported?
> Actually, I know that Dario has an implementation of exactly this 
> feature (and it used to be implemented in our previous scheduler as 
> well, i.e., the old AQuoSA stuff):
> a per-task flag, when enabled, allows to put temporarily the task into 
> SCHED_OTHER when its budget is exhausted. Therefore, it will be allowed 
> to run for more than its budget but without breaking the temporal 
> isolation with the other SCHED_DEADLINE tasks. Furthermore, it won't 
> starve other SCHED_OTHER tasks, as it will compete with them for the CPU 
> during the budget-exhausted time windows.

Good to know, thanks!

-- Steve


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