linux-kernel - Re: [PATCH 01/13] sched: Add 3 new scheduler syscalls to support an extended scheduling parameters ABI

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Date:	Tue, 21 Jan 2014 17:46:13 +0100
From:	Juri Lelli <juri.lelli@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>
CC:	Michael Kerrisk <mtk.manpages@...il.com>,
	Dario Faggioli <raistlin@...ux.it>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>, fweisbec@...il.com,
	darren@...art.com, johan.eker@...csson.com, p.faure@...tech.ch,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	claudio@...dence.eu.com, michael@...rulasolutions.com,
	fchecconi@...il.com, tommaso.cucinotta@...up.it,
	nicola.manica@...i.unitn.it, luca.abeni@...tn.it,
	dhaval.giani@...il.com, hgu1972@...il.com,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	insop.song@...il.com, liming.wang@...driver.com, jkacur@...hat.com
Subject: Re: [PATCH 01/13] sched: Add 3 new scheduler syscalls to support
 an extended scheduling parameters ABI

On 01/21/2014 05:06 PM, Peter Zijlstra wrote:
> On Tue, Jan 21, 2014 at 11:02:55AM -0500, Steven Rostedt wrote:
>> On Tue, 21 Jan 2014 16:46:03 +0100
>> Peter Zijlstra <peterz@...radead.org> wrote:
>>
>>> On Tue, Jan 21, 2014 at 04:38:51PM +0100, Peter Zijlstra wrote:
>>>>     SCHED_DEADLINE: Sporadic task model deadline scheduling
>>>> 	SCHED_DEADLINE is an implementation of GEDF (Global Earliest
>>>> 	Deadline First) with additional CBS (Constant Bandwidth Server).
>>>
>>> We might want to re-word that to:
>>>
>>> 	SCHED_DEADLINE currently is an implementation of GEDF, however
>>> 	any policy that correctly schedules the sporadic task model is
>>> 	a valid implementation.
>>>
>>> To make sure we should not rely on the actual implementation; there's
>>> many possible algorithms to schedule the sporadic task model.
>>
>> Probably should post some links to GEDF documentation too?
> 
> At best I think we can do something like:
> 
> SEE ALSO
> 	Documentation/scheduler/sched_deadline.txt in the Linux kernel
> 	source tree (since kernel 3.14).
> 
> Possibly also an ISBN for a good scheduling theory book (if there exists
> such a thing), but I would have to rely on others to provide such as my
> shelfs are devoid of such material.
> 

Well, picking just one is not that easy, I'd say (among many others):

 - Handbook of Scheduling: Algorithms, Models, and Performance Analysis
   by Joseph Y-T. Leung, James H. Anderson - ISBN-10: 1584883979
   (especially cap. 30);
 - Hard Real-Time Computing Systems by Giorgio C. Buttazzo
   ISBN 978-1-4614-0675-4 (even if it is more about UP);
 - A survey of hard real-time scheduling for multiprocessor systems
   by RI Davis, A Burns - ACM Computing Surveys (CSUR), 2011
   (available at http://www-users.cs.york.ac.uk/~robdavis/papers/MPSurveyv5.0.pdf);

Probably last one is better (as is freely downloadable). We should add
something in the documentation too.

Thanks,

- Juri
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