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

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Date:	Tue, 15 May 2012 20:13:45 +0200
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	svaidy@...ux.vnet.ibm.com
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

On 15 May 2012 18:30, Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com> wrote:
> * 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.

Hi Vaidy

Your cleanup patch should not impact current ARM platform. IIUC, you
have merged sched_mc and sched_smt interface and there is no ARM
platform with SMT yet

Regards,
Vincent
>
> --Vaidy
>
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