linux-kernel - Re: Inquiry: Should we remove "isolcpus= kernel boot option? (may have realtime uses)

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Date:	Fri, 8 May 2009 11:48:20 +0900
From:	GeunSik Lim <leemgs1@...il.com>
To:	trimarchimichael@...oo.it
Cc:	Max Krasnyansky <maxk@...lcomm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mark Hounschell <dmarkh@....rr.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ingo Oeser <ioe-lkml@...eria.de>, Paul Jackson <pj@....com>,
	linux-kernel@...r.kernel.org, Con Kolivas <kernel@...ivas.org>,
	"Derek L. Fults" <dfults@....com>, devik <devik@....cz>,
	Dimitri Sivanich <sivanich@....com>,
	Dinakar Guniguntala <dino@...ibm.com>,
	Emmanuel Pacaud <emmanuel.pacaud@...v-poitiers.fr>,
	Frederik Deweerdt <deweerdt@...e.fr>,
	Ingo Molnar <mingo@...e.hu>,
	Matthew Dobson <colpatch@...ibm.com>, rostedt@...dmis.org,
	Oleg Nesterov <oleg@...sign.ru>,
	"Paul E. McKenney" <paulmck@...ibm.com>,
	Paul Menage <menage@...gle.com>,
	"Randy.Dunlap" <rddunlap@...l.org>, suresh.b.siddha@...el.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Fabio Checconi <fabio@...dalf.sssup.it>
Subject: Re: Inquiry: Should we remove "isolcpus= kernel boot option? (may 
	have realtime uses)

Dear Michael Trimarchi,

Recently, I read your paper about EDF implementation  in Linux  like belows.

http://feanor.sssup.it/~marko/SAC09.pdf
(An implementation of the earliest deadline first algorithm in Linux
Proceedings of the 2009 ACM symposium on Applied Computing. )

Can I get your 2.6.27 based EDF patch to  test your experiment result ?
Thanks reading.


Regards,
GeunSik, Lim


2008/6/5 Michael Trimarchi <trimarchimichael@...oo.it>:
> [ sorry if this is going OT ]
>
> Hi,
>
>>
>> Furthermore, cpusets allow for isolated but load-balanced RT domains. We
>> now have a reasonably strong RT balancer, and I'm looking at implementing
>> a full partitioned EDF scheduler somewhere in the future.
>>
>
> I'm working on a partitioned EDF scheduler right now, and I have to
> face several issues, starting from the interface to use to expose the
> EDF scheduler to userspace, and the integration with the existing
> sched_rt policy.
>
> By now I'm experimenting with an additional sched_class that implements
> a SCHED_EDF policy, extending the POSIX struct sched_param with the
> EDF parameters of the task, do you see any better way to do that?
> Could that approach be reasonable?
>
> Michael
>
>
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-- 
Regards,
GeunSik Lim
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