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

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Message-Id: <1247564172.9086.26.camel@Palantir>
Date:	Tue, 14 Jul 2009 11:36:12 +0200
From:	Raistlin <raistlin@...ux.it>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	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>,
	Douglas Niehaus <niehaus@...c.ku.edu>,
	Ted Baker <baker@...fsu.edu>,
	Dhaval Giani <dhaval.giani@...il.com>
Subject: Re: RFC for a new Scheduling policy/class in the Linux-kernel

On Tue, 2009-07-14 at 10:42 +0200, Peter Zijlstra wrote:
> On Mon, 2009-07-13 at 18:06 +0200, Raistlin wrote:
> > Anyway, maybe if, on some architecture, for some kind of application,
> > the affinity may have been set to preserve some kind actual cache or
> > memory locality for the task access pattern, maybe this could be an
> > issue, couldn't it? :-)
> > I mean, in some case where being sure of having a task running on a
> > particular CPU is somehow of paramount importance...
> 
> Right, and you answered your own question :-), its _running_ that is
> important, so as long as its blocked (not running), you're free to place
> the task on another cpu if that helps out with something.
> 
Yep! Re-reading both your and my comments I saw I misunderstood your
point! :-(

I agree thet you have to move some task and, moving the "blocked" ones,
would allow the lock-owner to continue running in its place, which
sounds good to me to. :-)

Sorry!
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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