linux-kernel - Re: [PATCH 1/3] Added runqueue clock normalized with cpufreq

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Date:	Fri, 17 Dec 2010 19:48:18 +0100
From:	Dario Faggioli <raistlin@...ux.it>
To:	Harald Gustafsson <hgu1972@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Harald Gustafsson <harald.gustafsson@...csson.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	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>
Subject: Re: [PATCH 1/3] Added runqueue clock normalized with cpufreq

On Fri, 2010-12-17 at 16:02 +0100, Harald Gustafsson wrote: 
> > Once you have a governor that keeps the freq such that: freq/max_freq >=
> > utilization (which is only sufficient for deadline == period systems),
> > then you need to frob the SCHED_DEADLINE runtime accounting.
> 
> I agree that this is the other part of the solution, which I have in a separate
> ondemand governor, but that code is not ready for public review yet. Since that
> code also incorporate other ondemand changes I'm playing with. 
>
So, while we're waiting for this to be cooked...

> OK, I can do that. My thought from the beginning was considering that
> the reading of the clock was done more often then updating it, but I agree that
> it has a negative impact on none dl threads.
> 
... We can at least integrate this (done in the proper, way as Peter
suggests, i.e., _inside_ SCHED_DEADLINE) in the next release of the
patchset, can't we?

Regards,
Dario

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

http://retis.sssup.it/people/faggioli -- dario.faggioli@...ber.org

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