Date: Tue, 15 Oct 2013 10:43:24 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Juri Lelli <juri.lelli@gmail.com>
Cc: tglx@linutronix.de, mingo@redhat.com, rostedt@goodmis.org, oleg@redhat.com,
        fweisbec@gmail.com, darren@dvhart.com, johan.eker@ericsson.com,
        p.faure@akatech.ch, linux-kernel@vger.kernel.org,
        claudio@evidence.eu.com, michael@amarulasolutions.com,
        fchecconi@gmail.com, tommaso.cucinotta@sssup.it,
        nicola.manica@disi.unitn.it, luca.abeni@unitn.it,
        dhaval.giani@gmail.com, hgu1972@gmail.com, paulmck@linux.vnet.ibm.com,
        raistlin@linux.it, insop.song@gmail.com, liming.wang@windriver.com,
        jkacur@redhat.com, harald.gustafsson@ericsson.com,
        vincent.guittot@linaro.org,
        bruce.ashfield@windriver.com--no-chain-reply-to
Subject: Re: [PATCH 06/14] sched: add period support for -deadline tasks.
Message-ID: <20131015084324.GB10651@twins.programming.kicks-ass.net>
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On Tue, Oct 15, 2013 at 10:23:19AM +0200, Juri Lelli wrote:
> On 10/14/2013 02:07 PM, Peter Zijlstra wrote:
> > On Mon, Oct 14, 2013 at 12:43:38PM +0200, Juri Lelli wrote:
> >> From: Harald Gustafsson <harald.gustafsson@ericsson.com>
> >>
> >> Make it possible to specify a period (different or equal than
> >> deadline) for -deadline tasks.
> > 
> > Could we add a little blurb here as to why we'd want this?
> > 
> > (I think I do, and I certainly know where to find the answer, but its
> > better to have a more complete changelog).
> > 
> 
> Yes, I could amend the commit message in something like this:
> 
> Make it possible to specify a period (different or equal than deadline) for
> -deadline tasks. Relative deadlines (D_i) are used on task arrivals to generate
> new scheduling (absolute) deadlines as "d = t + D_i", and periods (P_i) to
> postpone the scheduling deadlines as "d = d + P_i" when the budget is zero.
> This is in general useful to model (and schedule) tasks that have slow
> activation rates (long periods), but have to be scheduled soon once activated
> (short deadlines).
> 
> What do you think?

Yes that's much better. Thanks!
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