Message-ID: <535E28D0.7050502@linaro.org>
Date: Mon, 28 Apr 2014 12:09:20 +0200
From: Daniel Lezcano <daniel.lezcano@linaro.org>
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To: Peter Zijlstra <peterz@infradead.org>
CC: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Amit Kucheria <amit.kucheria@linaro.org>, Ingo Molnar <mingo@elte.hu>,
        Lists linaro-kernel <linaro-kernel@lists.linaro.org>,
        Linux PM list <linux-pm@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/3] sched: idle: Add sched balance option
References: <1398342291-16322-1-git-send-email-daniel.lezcano@linaro.org> <535911DC.9050109@linaro.org> <CAP245DXFRfARtEfj70XD8D8OiAT_1i_5G2zao+y0DT0Lg_YFJA@mail.gmail.com> <2713863.BLQTYQm2Oa@vostro.rjw.lan> <20140425132055.GC11096@twins.programming.kicks-ass.net> <535A94E3.5080004@linaro.org> <20140425184327.GH26782@laptop.programming.kicks-ass.net>
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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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