linux-kernel - Re: [PATCH 2/3] cpuidle: play_idle: Specify play

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Date:   Wed, 18 Sep 2019 13:31:32 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     rafael@...nel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Amit Kucheria <amit.kucheria@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Kosina <jkosina@...e.cz>,
        Nicholas Piggin <npiggin@...il.com>
Subject: Re: [PATCH 2/3] cpuidle: play_idle: Specify play_idle with an idle
 state

On Mon, Sep 09, 2019 at 04:50:14PM +0200, Daniel Lezcano wrote:
> Currently, the play_idle function does not allow to tell which idle
> state we want to go. Improve this by passing the idle state as
> parameter to the function.
> 
> There is no functional changes, the cpuidle state is the deepest one.
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>  drivers/powercap/idle_inject.c           | 3 ++-
>  drivers/thermal/intel/intel_powerclamp.c | 4 +++-
>  include/linux/cpu.h                      | 2 +-
>  kernel/sched/idle.c                      | 4 ++--
>  4 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/powercap/idle_inject.c b/drivers/powercap/idle_inject.c
> index cd1270614cc6..9b18667b9f26 100644
> --- a/drivers/powercap/idle_inject.c
> +++ b/drivers/powercap/idle_inject.c
> @@ -138,7 +138,8 @@ static void idle_inject_fn(unsigned int cpu)
>  	 */
>  	iit->should_run = 0;
>  
> -	play_idle(READ_ONCE(ii_dev->idle_duration_us));
> +	play_idle(READ_ONCE(ii_dev->idle_duration_us),
> +		  cpuidle_find_deepest_state());
>  }
>  
>  /**
> diff --git a/drivers/thermal/intel/intel_powerclamp.c b/drivers/thermal/intel/intel_powerclamp.c
> index 53216dcbe173..b55786c169ae 100644
> --- a/drivers/thermal/intel/intel_powerclamp.c
> +++ b/drivers/thermal/intel/intel_powerclamp.c
> @@ -29,6 +29,7 @@
>  #include <linux/delay.h>
>  #include <linux/kthread.h>
>  #include <linux/cpu.h>
> +#include <linux/cpuidle.h>
>  #include <linux/thermal.h>
>  #include <linux/slab.h>
>  #include <linux/tick.h>
> @@ -430,7 +431,8 @@ static void clamp_idle_injection_func(struct kthread_work *work)
>  	if (should_skip)
>  		goto balance;
>  
> -	play_idle(jiffies_to_usecs(w_data->duration_jiffies));
> +	play_idle(jiffies_to_usecs(w_data->duration_jiffies),
> +		  cpuidle_find_deepest_state());
>  
>  balance:
>  	if (clamping && w_data->clamping && cpu_online(w_data->cpu))
> diff --git a/include/linux/cpu.h b/include/linux/cpu.h
> index 88dc0c653925..76e3038b63ce 100644
> --- a/include/linux/cpu.h
> +++ b/include/linux/cpu.h
> @@ -179,7 +179,7 @@ void arch_cpu_idle_dead(void);
>  int cpu_report_state(int cpu);
>  int cpu_check_up_prepare(int cpu);
>  void cpu_set_state_online(int cpu);
> -void play_idle(unsigned long duration_us);
> +void play_idle(unsigned long duration_us, int state);
>  
>  #ifdef CONFIG_HOTPLUG_CPU
>  bool cpu_wait_death(unsigned int cpu, int seconds);
> diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
> index 17da9cb309e1..ead439dab2b5 100644
> --- a/kernel/sched/idle.c
> +++ b/kernel/sched/idle.c
> @@ -311,7 +311,7 @@ static enum hrtimer_restart idle_inject_timer_fn(struct hrtimer *timer)
>  	return HRTIMER_NORESTART;
>  }
>  
> -void play_idle(unsigned long duration_us)
> +void play_idle(unsigned long duration_us, int state)
>  {
>  	struct idle_timer it;
>  
> @@ -328,7 +328,7 @@ void play_idle(unsigned long duration_us)
>  	rcu_sleep_check();
>  	preempt_disable();
>  	current->flags |= PF_IDLE;
> -	cpuidle_use_state(cpuidle_find_deepest_state());
> +	cpuidle_use_state(state);
>  
>  	it.done = 0;
>  	hrtimer_init_on_stack(&it.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);

Acked-by: Mathieu Poirier <mathieu.poirier@...aro.org>

> -- 
> 2.17.1
>