linux-kernel - Re: [RFC 10/12][PATCH] SCHED_DEADLINE: group bandwidth management code

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Date:	Mon, 28 Dec 2009 15:51:12 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Raistlin <raistlin@...ux.it>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	michael trimarchi <michael@...dence.eu.com>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Johan Eker <johan.eker@...csson.com>,
	"p.faure" <p.faure@...tech.ch>,
	Chris Friesen <cfriesen@...tel.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Henrik Austad <henrik@...tad.us>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Darren Hart <darren@...art.com>,
	Sven-Thorsten Dietrich <sven@...bigcorporation.com>,
	Bjoern Brandenburg <bbb@...unc.edu>,
	Tommaso Cucinotta <tommaso.cucinotta@...up.it>,
	"giuseppe.lipari" <giuseppe.lipari@...up.it>,
	Juri Lelli <juri.lelli@...il.com>
Subject: Re: [RFC 10/12][PATCH] SCHED_DEADLINE: group bandwidth management
 code

On Fri, 2009-10-16 at 17:46 +0200, Raistlin wrote:
> CPU Container Groups support for SCHED_DEADLINE is introduced by this commit.
> 
> CGroups, if configured, have a SCHED_DEADLINE bandwidth, and it is enforced
> that the sum of the bandwidths of entities (tasks and groups) belonging to
> a group stays below its own bandwidth.

No real comment on the code here, but since we have a deadline bandwidth
reservation, should we not also couple to the existing rt (fifo)
bandwidth reservation?

We can't after all guarantee the FIFO time if there's deadline
reservations around for more.

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