linux-kernel - Re: [RFC PATCHC 3/3] sched/fair: use the idle state info to choose the idlest cpu

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Message-ID: <5350E425.6070300@linaro.org>
Date:	Fri, 18 Apr 2014 10:36:53 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, rjw@...ysocki.net,
	linux-pm@...r.kernel.org, alex.shi@...aro.org,
	vincent.guittot@...aro.org, morten.rasmussen@....com
Subject: Re: [RFC PATCHC 3/3] sched/fair: use the idle state info to choose
 the idlest cpu

On 04/18/2014 10:09 AM, Ingo Molnar wrote:
>
> * Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>
>> On 04/17/2014 04:47 PM, Peter Zijlstra wrote:
>>> On Thu, Apr 17, 2014 at 03:53:32PM +0200, Daniel Lezcano wrote:
>>>> Concerning the policy, I would suggest to create an entry in
>>>> /proc/sys/kernel/sched_power, where a couple of values could be performance
>>>> - power saving (0 / 1).
>>>
>>> Ingo wanted a sched_balance_policy file with 3 values:
>>>    "performance, power, auto"
>>>
>>> Where the auto thing switches between them, initially based off of
>>> having AC or not.
>>
>> oh, good. Thanks !
>
> Also, 'auto' should be the default, because the kernel doing TRT is
> really what users want.
>
> Userspace can sill tweak it all and make it all user-space controlled,
> by flipping between 'performance' and 'power'. (and those modes are
> also helpful for development and debugging.)

Copy that.

   Thanks !

   -- Daniel


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