linux-kernel - Re: [PATCH V3 2/2] sched: idle: IRQ based next prediction for idle period

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Message-ID: <56C59C32.1000903@linaro.org>
Date:	Thu, 18 Feb 2016 10:25:54 +0000
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	"Rafael J. Wysocki" <rafael@...nel.org>
Cc:	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH V3 2/2] sched: idle: IRQ based next prediction for idle
 period

On 02/17/2016 11:21 PM, Rafael J. Wysocki wrote:

[ ... ]

>>> Reviewed-by: Nicolas Pitre <nico@...aro.org>
>>
>> Well, I'm likely overlooking something, but how is this going to be
>> hooked up to the code in idle.c?
>
> My somewhat educated guess is that sched_idle() in your patch is
> intended to replace cpuidle_idle_call(), right?

Well, no. I was planning to first have it to use a different code path 
as experimental code in order to focus improving the accuracy of the 
prediction and then merge or replace cpuidle_idle_call() with sched_idle().

> If so, why do you want to replace it?
>
> And assuming that you have a good enough reason to do that, you need
> to ensure that suspend-to-idle will work anyway.

Yes, sure.


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