linux-kernel - Re: [PATCH 06/14] sched: add period support for -deadline tasks.

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Date:	Tue, 15 Oct 2013 10:43:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Juri Lelli <juri.lelli@...il.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, rostedt@...dmis.org,
	oleg@...hat.com, fweisbec@...il.com, darren@...art.com,
	johan.eker@...csson.com, p.faure@...tech.ch,
	linux-kernel@...r.kernel.org, claudio@...dence.eu.com,
	michael@...rulasolutions.com, fchecconi@...il.com,
	tommaso.cucinotta@...up.it, nicola.manica@...i.unitn.it,
	luca.abeni@...tn.it, dhaval.giani@...il.com, hgu1972@...il.com,
	paulmck@...ux.vnet.ibm.com, raistlin@...ux.it,
	insop.song@...il.com, liming.wang@...driver.com, jkacur@...hat.com,
	harald.gustafsson@...csson.com, vincent.guittot@...aro.org,
	bruce.ashfield@...driver.com--no-chain-reply-to
Subject: Re: [PATCH 06/14] sched: add period support for -deadline tasks.

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@...csson.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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