From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Lezcano <daniel.lezcano@linaro.org>
Subject: Re: [RFC PATCH 2/2] sched: idle: IRQ based next prediction for idle
 period
Date: Tue, 12 Jan 2016 15:16:44 +0100
Message-ID: <56950ACC.4090001@linaro.org>
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To: Thomas Gleixner <tglx@linutronix.de>
Cc: peterz@infradead.org, rafael@kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, nicolas.pitre@linaro.org, vincent.guittot@linaro.org

On 01/12/2016 02:42 PM, Thomas Gleixner wrote:
> On Tue, 12 Jan 2016, Daniel Lezcano wrote:
>> On 01/08/2016 04:43 PM, Thomas Gleixner wrote:
>>>> +	/*
>>>> +	 * Register the setup/free irq callbacks, so new interrupt or
>>>> +	 * freed interrupt will update their tracking.
>>>> +	 */
>>>> +	ret =3D register_irq_timings(&irqt_ops);
>>>> +	if (ret) {
>>>> +		pr_err("Failed to register timings ops\n");
>>>> +		return ret;
>>>> +	}
>>>
>>> So that stuff is installed unconditionally. Is it used unconditiona=
lly as
>>> well?
>>
>> Sorry, I am not sure to understand your question. If the kernel is c=
ompiled
>> with CONFIG_CPU_IDLE_GOV_SCHED=3Dy, this code is enabled and use the=
 irq
>> timings. The condition comes from the compilation option.
>
> The question is whether the option also activates that thing or is th=
ere still
> some /sys/whatever/idlegov magic where you can (de)select it.

Yes, in the next patches of the series I did not send, we can switch to=
=20
the cpuidle's governor framework or idle-sched. I will look at how to=20
disable it when switching to the cpuidle's governors.

Thanks

   -- Daniel


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