linux-kernel - Re: [PATCH 01/15] sched: introduce task_se_h

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Message-ID: <c5c07c34-b46a-6956-2341-138a83c8c800@arm.com>
Date:   Fri, 23 Aug 2019 20:13:39 +0200
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Rik van Riel <riel@...riel.com>, linux-kernel@...r.kernel.org
Cc:     kernel-team@...com, pjt@...gle.com, peterz@...radead.org,
        mingo@...hat.com, morten.rasmussen@....com, tglx@...utronix.de,
        mgorman@...hsingularity.net, vincent.guittot@...aro.org,
        Josef Bacik <josef@...icpanda.com>
Subject: Re: [PATCH 01/15] sched: introduce task_se_h_load helper



On 22/08/2019 04:17, Rik van Riel wrote:
> Sometimes the hierarchical load of a sched_entity needs to be calculated.
> Rename task_h_load to task_se_h_load, and directly pass a sched_entity to
> that function.
> 
> Move the function declaration up above where it will be used later.
> 
> No functional changes.
> 
> Signed-off-by: Rik van Riel <riel@...riel.com>
> Reviewed-by: Josef Bacik <josef@...icpanda.com>
> ---

[...]

> @@ -1668,7 +1668,7 @@ static void task_numa_compare(struct task_numa_env *env,
>  	/*
>  	 * In the overloaded case, try and keep the load balanced.
>  	 */
> -	load = task_h_load(env->p) - task_h_load(cur);
> +	load = task_se_h_load(env->p->se) - task_se_h_load(cur->se);

Shouldn't this be:

load = task_se_h_load(&env->p->se) - task_se_h_load(&cur->se);

>  	if (!load)
>  		goto assign;
>  
> @@ -1706,7 +1706,7 @@ static void task_numa_find_cpu(struct task_numa_env *env,
>  	bool maymove = false;
>  	int cpu;
>  
> -	load = task_h_load(env->p);
> +	load = task_se_h_load(env->p->se);

load = task_se_h_load(&env->p->se);

Only visible with CONFIG_NUMA_BALANCING though.

[...]