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

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Message-ID: <725760.23277.qm@web26207.mail.ukl.yahoo.com>
Date:	Wed, 4 Jun 2008 21:44:18 +0000 (GMT)
From:	Michael Trimarchi <trimarchimichael@...oo.it>
To:	Max Krasnyansky <maxk@...lcomm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	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)

[ 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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