linux-kernel - Re: periods and deadlines in SCHED

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Message-ID: <1280828775.1923.447.camel@laptop>
Date:	Tue, 03 Aug 2010 11:46:15 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Bjoern Brandenburg <bbb@...il.unc.edu>
Cc:	Raistlin <raistlin@...ux.it>,
	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>,
	bastoni@...unc.edu, Giuseppe Lipari <lipari@...is.sssup.it>
Subject: Re: periods and deadlines in SCHED_DEADLINE

On Sun, 2010-07-11 at 08:42 +0200, Bjoern Brandenburg wrote:
> If you want to do G-EDF with limited and different budgets on each CPU
> (e.g., G-EDF tasks may only run for 100 out of 1000 ms on CPU 0, but
> for 400 out of 1000 ms on CPU 1), then you are entering the domain of
> restricted-supply scheduling, which is significantly more complicated
> to analyze (see [1,2]).

Would making the thing homogenious by assuming the worst for all cpus
make the analysis easier? That is, in the above example, only allow the
G-EDF scheduler to run for 100 out of 1000 ms on both cpus.


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