linux-kernel - Re: RFC for a new Scheduling policy/class in the Linux-kernel

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Message-Id: <1247598852.4839.99.camel@Palantir>
Date:	Tue, 14 Jul 2009 21:14:12 +0200
From:	Raistlin <raistlin@...ux.it>
To:	Chris Friesen <cfriesen@...tel.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Douglas Niehaus <niehaus@...c.ku.edu>,
	Henrik Austad <henrik@...tad.us>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Bill Huey <billh@...ppy.monkey.org>,
	Linux RT <linux-rt-users@...r.kernel.org>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	"James H. Anderson" <anderson@...unc.edu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ted Baker <baker@...fsu.edu>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Noah Watkins <jayhawk@....ucsc.edu>,
	KUSP Google Group <kusp@...glegroups.com>,
	Tommaso Cucinotta <cucinotta@...up.it>,
	Giuseppe Lipari <lipari@...is.sssup.it>
Subject: Re: RFC for a new Scheduling policy/class in the Linux-kernel

On Tue, 2009-07-14 at 12:24 -0600, Chris Friesen wrote:
> > - that A is actually blocked, as said before;
> 
> Why does it make any difference that A is blocked rather than busy
> waiting?  In either case A cannot make forward progress.
> 
I think it's not a problem of A, but of the overall schedule, from a
system predictability perspective.

Anyway, we are still evaluating what, if any could the issues be.

> > - that A's budget is not diminished.
> 
> If we're running B with A's priority, presumably it will get some amount
> of cpu time above and beyond what it would normally have gotten during a
> particular scheduling interval.  
>
Right...

> Perhaps it would make sense to charge B
> what it would normally have gotten, and charge the excess amount to A?
> 
Mmm.. That's right, but I'm not sure I get what happen while executing
C... Anyway, it seems to me that we are getting closer to each other
point of view... let's keep staying in touch! :-D

Regards,
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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