linux-kernel - Re: [RFC][PATCH 05/22] sched: SCHED

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Date:	Wed, 10 Nov 2010 20:43:34 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Raistlin <raistlin@...ux.it>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	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 05/22] sched: SCHED_DEADLINE policy implementation

On Fri, 2010-10-29 at 08:30 +0200, Raistlin wrote:
> + * We are being explicitly informed that a new instance is starting,
> + * and this means that:
> + *  - the absolute deadline of the entity has to be placed at
> + *    current time + relative deadline;
> + *  - the runtime of the entity has to be set to the maximum value.

When exactly are we a new instance? From a quick look dl_new gets set
after a sched_setscheduler() call, is that the only way?

Could a task calling sched_setscheduler() on itself cheat the system?
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