Re: Plumbers: Tweaking scheduler policy micro-conf RFP

[Vincent Guittot]

On 15 May 2012 18:30, Vaidyanathan Srinivasan <svaidy@xxxxxxxxxxxxxxxxxx> wrote:
> * Vincent Guittot <vincent.guittot@xxxxxxxxxx> [2012-05-15 17:05:47]:
>
>> On 15 May 2012 15:00, Peter Zijlstra <peterz@xxxxxxxxxxxxx> 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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