linux-kernel - Re: Plumbers: Tweaking scheduler policy micro-conf RFP

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Message-ID: <20120515163016.GA4062@dirshya.in.ibm.com>
Date:	Tue, 15 May 2012 22:00:42 +0530
From:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, paulmck@...ux.vnet.ibm.com,
	smuckle@...cinc.com, khilman@...com, Robin.Randhawa@....com,
	suresh.b.siddha@...el.com, thebigcorporation@...il.com,
	venki@...gle.com, panto@...oniou-consulting.com, mingo@...e.hu,
	paul.brett@...el.com, pdeschrijver@...dia.com, pjt@...gle.com,
	efault@....de, fweisbec@...il.com, geoff@...radead.org,
	rostedt@...dmis.org, tglx@...utronix.de, amit.kucheria@...aro.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linaro-sched-sig@...ts.linaro.org,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Juri Lelli <juri.lelli@...il.com>
Subject: Re: Plumbers: Tweaking scheduler policy micro-conf RFP

* Vincent Guittot <vincent.guittot@...aro.org> [2012-05-15 17:05:47]:

> On 15 May 2012 15:00, Peter Zijlstra <peterz@...radead.org> wrote:
> > On Tue, 2012-05-15 at 14:57 +0200, Vincent Guittot wrote:
> >>
> >> Not sure that nobody cares but it's much more that scheduler,
> >> load_balance and sched_mc are sensible enough that it's difficult to
> >> ensure that a modification will not break everything for someone
> >> else.
> >
> > Thing is, its already broken, there's nothing else to break :-)
> >
> 
> sched_mc is the only power-aware knob in the current scheduler. It's
> far from being perfect but it seems to work on some ARM platform at
> least. You mentioned at the scheduler mini-summit that we need a
> cleaner replacement and everybody has agreed on that point. Is anybody
> working on it yet ? and can we discuss at Plumber's what this
> replacement would look like ?

Hi Vincent,

In the earlier discussion we listed down the cleanup requirements.
I made a cleanup patch that unifies the sysfs interface as a first
step.

[RFC PATCH v1 0/2] sched: unified sched_powersavings tunables
http://thread.gmane.org/gmane.linux.kernel/1239750

I need to make this scheme generically work on different topology,
which is the real problem that we need to solve.

--Vaidy

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