Subject: Re: [RFC][PATCH 02/22] sched: add extended scheduling interface
From: Steven Rostedt <rostedt@goodmis.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Raistlin <raistlin@linux.it>, Ingo Molnar <mingo@elte.hu>,
        Thomas Gleixner <tglx@linutronix.de>,
        Chris Friesen <cfriesen@nortel.com>, oleg@redhat.com,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Darren Hart <darren@dvhart.com>, Johan Eker <johan.eker@ericsson.com>,
        "p.faure" <p.faure@akatech.ch>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Claudio Scordino <claudio@evidence.eu.com>,
        michael trimarchi <trimarchi@retis.sssup.it>,
        Fabio Checconi <fabio@gandalf.sssup.it>,
        Tommaso Cucinotta <cucinotta@sssup.it>,
        Juri Lelli <juri.lelli@gmail.com>,
        Nicola Manica <nicola.manica@disi.unitn.it>,
        Luca Abeni <luca.abeni@unitn.it>, Dhaval Giani <dhaval@retis.sssup.it>,
        Harald Gustafsson <hgu1972@gmail.com>,
        paulmck <paulmck@linux.vnet.ibm.com>
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Date: Fri, 12 Nov 2010 11:52:52 -0500
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On Fri, 2010-11-12 at 17:43 +0100, Peter Zijlstra wrote:
> On Fri, 2010-11-12 at 11:38 -0500, Steven Rostedt wrote:
> > A while ago I implemented an EDF scheduler for a client (before working
> > with Red Hat), and one thing they asked about was having a "soft group",
> > which was basically: This group is guaranteed X runtime in Y period, but
> > if the system is idle, let the group run, even if it has exhausted its X
> > runtime.
> > 
> > Is this supported? 
> 
> No, some of the bits in 18/22 come near, but I'd prefer not to add such
> things until we've got a convincing use-case.

I'm fine with that, but I would like to know if the ABI would be able to
add such an extension in the future if we find a convincing use-case.

-- Steve


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