linux-kernel - Re: [PATCH v1 06/16] thermal: gov_power_allocator: Use .manage() callback instead of .throttle()

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Message-ID: <1aea8475-e47c-479b-b06e-638d442f277e@arm.com>
Date: Fri, 19 Apr 2024 10:50:37 +0100
From: Lukasz Luba <lukasz.luba@....com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: LKML <linux-kernel@...r.kernel.org>, Linux PM <linux-pm@...r.kernel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: Re: [PATCH v1 06/16] thermal: gov_power_allocator: Use .manage()
 callback instead of .throttle()



On 4/10/24 17:10, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> The Power Allocator governor really only wants to be called once per
> thermal zone update and it does a special check to skip the extra,
> from its perspective, invocations of the .throttle() callback.
> 
> Make it use .manage() instead of .throttle().
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>   drivers/thermal/gov_power_allocator.c |   24 +++++++-----------------
>   1 file changed, 7 insertions(+), 17 deletions(-)
> 
> Index: linux-pm/drivers/thermal/gov_power_allocator.c
> ===================================================================
> --- linux-pm.orig/drivers/thermal/gov_power_allocator.c
> +++ linux-pm/drivers/thermal/gov_power_allocator.c
> @@ -395,7 +395,7 @@ static void divvy_up_power(struct power_
>   	}
>   }
>   
> -static int allocate_power(struct thermal_zone_device *tz, int control_temp)
> +static void allocate_power(struct thermal_zone_device *tz, int control_temp)
>   {
>   	struct power_allocator_params *params = tz->governor_data;
>   	unsigned int num_actors = params->num_actors;
> @@ -410,7 +410,7 @@ static int allocate_power(struct thermal
>   	int i = 0, ret;
>   
>   	if (!num_actors)
> -		return -ENODEV;
> +		return;
>   
>   	/* Clean all buffers for new power estimations */
>   	memset(power, 0, params->buffer_size);
> @@ -471,8 +471,6 @@ static int allocate_power(struct thermal
>   				      num_actors, power_range,
>   				      max_allocatable_power, tz->temperature,
>   				      control_temp - tz->temperature);
> -
> -	return 0;
>   }
>   
>   /**
> @@ -745,40 +743,32 @@ static void power_allocator_unbind(struc
>   	tz->governor_data = NULL;
>   }
>   
> -static int power_allocator_throttle(struct thermal_zone_device *tz,
> -				    const struct thermal_trip *trip)
> +static void power_allocator_manage(struct thermal_zone_device *tz)
>   {
>   	struct power_allocator_params *params = tz->governor_data;
> +	const struct thermal_trip *trip = params->trip_switch_on;
>   	bool update;
>   
>   	lockdep_assert_held(&tz->lock);
>   
> -	/*
> -	 * We get called for every trip point but we only need to do
> -	 * our calculations once
> -	 */
> -	if (trip != params->trip_max)
> -		return 0;
> -
> -	trip = params->trip_switch_on;
>   	if (trip && tz->temperature < trip->temperature) {
>   		update = tz->passive;
>   		tz->passive = 0;
>   		reset_pid_controller(params);
>   		allow_maximum_power(tz, update);
> -		return 0;
> +		return;
>   	}
>   
>   	tz->passive = 1;
>   
> -	return allocate_power(tz, params->trip_max->temperature);
> +	allocate_power(tz, params->trip_max->temperature);
>   }
>   
>   static struct thermal_governor thermal_gov_power_allocator = {
>   	.name		= "power_allocator",
>   	.bind_to_tz	= power_allocator_bind,
>   	.unbind_from_tz	= power_allocator_unbind,
> -	.throttle	= power_allocator_throttle,
> +	.manage		= power_allocator_manage,
>   	.update_tz	= power_allocator_update_tz,
>   };
>   THERMAL_GOVERNOR_DECLARE(thermal_gov_power_allocator);
> 
> 
> 

LGTM

Reviewed-by: Lukasz Luba <lukasz.luba@....com>