From: Dario Faggioli <raistlin@linux.it>
To: Harald Gustafsson <hgu1972@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Harald Gustafsson <harald.gustafsson@ericsson.com>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Thomas Gleixner <tglx@linutronix.de>,
Claudio Scordino <claudio@evidence.eu.com>,
Michael Trimarchi <trimarchi@retis.sssup.it>,
Fabio Checconi <fabio@gandalf.sssup.it>,
Tommaso Cucinotta <cucinotta@sssup.it>,
Juri Lelli <juri.lelli@gmail.com>
Subject: Re: [PATCH 1/3] Added runqueue clock normalized with cpufreq
Date: Fri, 17 Dec 2010 19:48:18 +0100 [thread overview]
Message-ID: <1292611698.2697.61.camel@Palantir> (raw)
In-Reply-To: <AANLkTi=L9KB_P62Rn7kpuMxbSNnE9U4+EZK6nwqFZ-x7@mail.gmail.com>
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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@jabber.org
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next prev parent reply other threads:[~2010-12-17 18:46 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-17 13:02 [PATCH 1/3] Added runqueue clock normalized with cpufreq Harald Gustafsson
2010-12-17 13:02 ` [PATCH 2/3] cpufreq normalized runtime to enforce runtime cycles also at lower frequencies Harald Gustafsson
2010-12-17 13:02 ` [PATCH 3/3] sched trace updated with normalized clock info Harald Gustafsson
2010-12-17 14:29 ` [PATCH 1/3] Added runqueue clock normalized with cpufreq Peter Zijlstra
2010-12-17 14:32 ` Peter Zijlstra
2010-12-17 15:06 ` Harald Gustafsson
2010-12-17 15:16 ` Peter Zijlstra
2010-12-17 15:36 ` Harald Gustafsson
2010-12-17 15:43 ` Thomas Gleixner
2010-12-17 15:54 ` Harald Gustafsson
2010-12-17 18:44 ` Dario Faggioli
2011-01-03 14:17 ` Pavel Machek
2010-12-17 15:02 ` Harald Gustafsson
2010-12-17 18:48 ` Dario Faggioli [this message]
2010-12-17 18:56 ` Dario Faggioli
2010-12-17 18:59 ` Peter Zijlstra
2010-12-17 19:16 ` Dario Faggioli
2010-12-17 19:31 ` Harald Gustafsson
2010-12-20 0:11 ` Tommaso Cucinotta
2010-12-20 9:44 ` Harald Gustafsson
2011-01-03 20:25 ` Tommaso Cucinotta
2011-01-04 12:16 ` Harald Gustafsson
2010-12-17 19:27 ` Harald Gustafsson
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