linux-kernel - Re: [RFC][PATCH 18/22] sched: add reclaiming logic to -deadline tasks

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Date:	Mon, 15 Nov 2010 22:34:48 +0100
From:	Raistlin <raistlin@...ux.it>
To:	"James H. Anderson" <anderson@...unc.edu>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Chris Friesen <cfriesen@...tel.com>, oleg@...hat.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	Darren Hart <darren@...art.com>,
	Johan Eker <johan.eker@...csson.com>,
	"p.faure" <p.faure@...tech.ch>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Claudio Scordino <claudio@...dence.eu.com>,
	michael trimarchi <trimarchi@...is.sssup.it>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	Tommaso Cucinotta <cucinotta@...up.it>,
	Juri Lelli <juri.lelli@...il.com>,
	Nicola Manica <nicola.manica@...i.unitn.it>,
	Luca Abeni <luca.abeni@...tn.it>,
	Dhaval Giani <dhaval@...is.sssup.it>,
	Harald Gustafsson <hgu1972@...il.com>,
	paulmck <paulmck@...ux.vnet.ibm.com>,
	Bjoern Brandenburg <bbb@...il.unc.edu>
Subject: Re: [RFC][PATCH 18/22] sched: add reclaiming logic to -deadline
 tasks

On Mon, 2010-11-15 at 13:37 -0500, James H. Anderson wrote:
> Sorry for the delayed response... I think I must have inadvertently 
> deleted this
>
NP. Hope it's not my fault, due to GPG and stuff... :-)

> If you're talking about our most recent "stochastic" paper, it is about 
> supporting
> soft real-time task systems on a multiprocessor where resource 
> reservations are
> used.  
>
Actually, we were talking about the previous one, which (if I got it
well) didn't include reservations, and that's why we were wondering how
to integrate it in the scheduler (which _is_ reservation based).

Now that this one is out, going for it simply solves all our issues,
also considering that it says something very similar to what we (Pisa
guys :-D) are familiar with, since we investigated this stuff too
sometime ago (actually, Luca did).

> However, such methods would be easy to incorporate.  
>
I think it really should be... Actually, I'm under the impression that
we don't even need variance/std-dev of the execution time to be part of
the interface, do we?

> I gathered there was
> some confusion about whether we were using resource reservations.  Such
> reservations are actually crucial for our analysis as they allow 
> independence to be assumed across tasks.
>
Yes, as I said, this was because we were looking at first paper. Now we
got it, thanks a lot for clarifying! :-)

> I hope this helps.
> 
A lot, thanks again.

Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
----------------------------------------------------------------------
Dario Faggioli, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa  (Italy)

http://blog.linux.it/raistlin / raistlin@...ga.net /
dario.faggioli@...ber.org

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