Subject: Re: [RFC 10/12][PATCH] SCHED_DEADLINE: group bandwidth management
 code
From: Peter Zijlstra <peterz@infradead.org>
To: Raistlin <raistlin@linux.it>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
       michael trimarchi <michael@evidence.eu.com>,
       Fabio Checconi <fabio@gandalf.sssup.it>, Ingo Molnar <mingo@elte.hu>,
       Thomas Gleixner <tglx@linutronix.de>,
       Dhaval Giani <dhaval.giani@gmail.com>,
       Johan Eker <johan.eker@ericsson.com>, "p.faure" <p.faure@akatech.ch>,
       Chris Friesen <cfriesen@nortel.com>,
       Steven Rostedt <rostedt@goodmis.org>, Henrik Austad <henrik@austad.us>,
       Frederic Weisbecker <fweisbec@gmail.com>,
       Darren Hart <darren@dvhart.com>,
       Sven-Thorsten Dietrich <sven@thebigcorporation.com>,
       Bjoern Brandenburg <bbb@cs.unc.edu>,
       Tommaso Cucinotta <tommaso.cucinotta@sssup.it>,
       "giuseppe.lipari" <giuseppe.lipari@sssup.it>,
       Juri Lelli <juri.lelli@gmail.com>
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Date: Mon, 28 Dec 2009 15:51:12 +0100
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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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