linux-kernel - Re: [PATCH] sched/deadline: Add sched

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Date:	Tue, 21 Jan 2014 11:28:37 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Luca Abeni <luca.abeni@...tn.it>, Henrik Austad <henrik@...tad.us>,
	Juri Lelli <juri.lelli@...il.com>, tglx@...utronix.de,
	mingo@...hat.com, oleg@...hat.com, fweisbec@...il.com,
	darren@...art.com, johan.eker@...csson.com, p.faure@...tech.ch,
	linux-kernel@...r.kernel.org, claudio@...dence.eu.com,
	michael@...rulasolutions.com, fchecconi@...il.com,
	tommaso.cucinotta@...up.it, nicola.manica@...i.unitn.it,
	dhaval.giani@...il.com, hgu1972@...il.com,
	paulmck@...ux.vnet.ibm.com, raistlin@...ux.it,
	insop.song@...il.com, liming.wang@...driver.com, jkacur@...hat.com,
	harald.gustafsson@...csson.com, vincent.guittot@...aro.org,
	bruce.ashfield@...driver.com, rob@...dley.net
Subject: Re: [PATCH] sched/deadline: Add sched_dl documentation

On Tue, 21 Jan 2014 14:55:59 +0100
Peter Zijlstra <peterz@...radead.org> wrote:


> > >I would strongly urge you not to use that as an example, because its
> > >dead wrong design. An RT thread (be it RR,FIFO or DL) should _NEVER_ do
> > >blocking IO.
> > Well, but it does happen in reality :)
> 
> Yeah, I know, my point was more about not encouraging people to do this
> by explicitly mentioning it.

Unless it is mentioned that this is fine for soft real-time uses, such
as what Luca described (mplayer and possibly Jack). Tools where missing
a deadline does not crash the system, but just reduces quality.

-- Steve
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