linux-kernel - Re: periods and deadlines in SCHED

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Date:	Fri, 09 Jul 2010 16:18:53 +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:

>  - using periods for calculating the tasks' bandwidth and then using   
>    deadlines for scheduling the tasks is going to work, but the
>    admission control test that you would need for ensuring anybody
>    will make its deadline is waaay more complex than Sum_i(BW_i)<1, even
>    for uniprocessors/partitionig. That one instead would gives you just
>    a very basic guarantee that the design in not completely broken
>    (formally, I think I should say it is only a necessary
>    condition :-)).

Happen to have a paper handy that explains all this in a concise way? 
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