linux-kernel - Re: periods and deadlines in SCHED

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Message-ID: <AANLkTinbHDFM4IrkATJ1KJhts5LFBelSmUTeS6cudM58@mail.gmail.com>
Date:	Sat, 10 Jul 2010 19:29:46 +0200
From:	Harald Gustafsson <hgu1972@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
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>,
	Bjoern Brandenburg <bbb@...il.unc.edu>, bastoni@...unc.edu,
	Giuseppe Lipari <lipari@...is.sssup.it>
Subject: Re: periods and deadlines in SCHED_DEADLINE

> Right, so I would actually expect RT job release to be triggered by
> external events (say interrupts) more than on their own. And when its an
> external event I don't really see the use of this new syscall.

I agree that the common usage would be to wake up by an external
event, rather than sleeping for a specified time period that is longer
than the set period. I would assume that the period would be changed
to match some generic operational unit of the task like a frame rate
or packet rate, etc.
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