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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20140121112837.43b08f22@gandalf.local.home>
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/