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Date: Tue, 12 Jan 2016 15:26:21 +0100 (CET) From: Thomas Gleixner <tglx@...utronix.de> To: Daniel Lezcano <daniel.lezcano@...aro.org> cc: peterz@...radead.org, rafael@...nel.org, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, nicolas.pitre@...aro.org, vincent.guittot@...aro.org Subject: Re: [RFC PATCH 2/2] sched: idle: IRQ based next prediction for idle period On Tue, 12 Jan 2016, Daniel Lezcano wrote: > 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 = 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 unconditionally > > > > as > > > > well? > > > > > > Sorry, I am not sure to understand your question. If the kernel is > > > compiled > > > with CONFIG_CPU_IDLE_GOV_SCHED=y, 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 there > > 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 the > cpuidle's governor framework or idle-sched. I will look at how to disable it > when switching to the cpuidle's governors. You better implement the switching part in the cpuidle core first, i.e. proper callbacks when a governor is switched in/out. Then make use of this switcheroo right away. Doing it the other way round is just wrong. Thanks, tglx
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