linux-kernel - Re: periods and deadlines in SCHED

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Message-ID: <1278685470.1900.206.camel@laptop>
Date:	Fri, 09 Jul 2010 16:24:30 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Raistlin <raistlin@...ux.it>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Song Yuan <song.yuan@...csson.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nicola Manica <nicola.manica@...i.unitn.it>,
	Luca Abeni <lucabe72@...il.it>,
	Claudio Scordino <claudio@...dence.eu.com>,
	Harald Gustafsson <harald.gustafsson@...csson.com>,
	Bjoern Brandenburg <bbb@...il.unc.edu>, bastoni@...unc.edu,
	Giuseppe Lipari <lipari@...is.sssup.it>
Subject: Re: periods and deadlines in SCHED_DEADLINE

On Fri, 2010-07-09 at 15:38 +0200, Raistlin wrote:
> Basically, from the scheduling point of view, what it could happen is
> that I'm still _NOT_ going to allow a task with runtime Q_i, deadline
> D_i and period P_i to use more bandwidth than Q_i/P_i, I'm still using D
> for scheduling but the passing of the simple in-kernel admission test
> Sum_i(Q_i/P_i)<1 won't guarantee that the task will always finish its
> jobs before D. 

But the tardiness would still be bounded, right? So its a valid Soft-RT
model?
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