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: <20140418080951.GB14280@gmail.com>
Date:	Fri, 18 Apr 2014 10:09:51 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Daniel Lezcano <daniel.lezcano@...aro.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


* 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.)

Thanks,

	Ingo
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