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

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Message-ID: <20120515151958.GD2461@linux.vnet.ibm.com>
Date:	Tue, 15 May 2012 08:19:58 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, 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

On Tue, May 15, 2012 at 05:05:47PM +0200, Vincent Guittot wrote:
> 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 ?

Hello, Vincent,

If I understand the patch from a first glance, Peter is doing what
everyone agreed to at the scheduler minisummit back in February.
>From the notes from that meeting at:

https://wiki.linaro.org/WorkingGroups/PowerManagement/Doc/HMPscheduling

See the line reading "Remove sched_mc. [Peter Zijlstra]".

Or am I confused about what Peter's patch does?

							Thanx, Paul

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