linux-kernel - Re: [PATCH 2/3] sched: idle: Add sched balance option

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Date:	Mon, 28 Apr 2014 12:09:20 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Ingo Molnar <mingo@...e.hu>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] sched: idle: Add sched balance option

On 04/25/2014 08:43 PM, Peter Zijlstra wrote:
> On Fri, Apr 25, 2014 at 07:01:23PM +0200, Daniel Lezcano wrote:
>> As the sysctl is some kind of ABI, I would like to make sure we reach a
>> consensus and discuss a bit about that.
>
> We could make it a sysfs file, like /sys/power/state, which when read
> provides the words it takes.
>
> That is more flexible than a numeric sysctl for which we have to keep an
> enumeration.

I agree a numerical value is not flexible. But it sounds weird to put a 
scheduler option in the sysfs and maybe more options will follow.

I am wondering if we shouldn't create a new cgroup for 'energy' and put 
everything in there. So we will have more flexibility for extension and 
we will be able to create a group of tasks for performance and a group 
of tasks for energy saving.

Does it make sense ?

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