linux-kernel - Re: [PATCH 03/14] sched,fair: redefine runnable_load_avg as the sum of task_h

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Message-ID: <20190729202608.GT31398@hirez.programming.kicks-ass.net>
Date:   Mon, 29 Jul 2019 22:26:08 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Rik van Riel <riel@...riel.com>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, pjt@...gle.com,
        dietmar.eggemann@....com, mingo@...hat.com,
        morten.rasmussen@....com, tglx@...utronix.de,
        mgorman@...hsingularity.net, vincent.guittot@...aro.org
Subject: Re: [PATCH 03/14] sched,fair: redefine runnable_load_avg as the sum
 of task_h_load

On Mon, Jul 22, 2019 at 01:33:37PM -0400, Rik van Riel wrote:
> @@ -263,8 +258,8 @@ ___update_load_avg(struct sched_avg *sa, unsigned long load, unsigned long runna
>  
>  int __update_load_avg_blocked_se(u64 now, struct sched_entity *se)
>  {
> -	if (___update_load_sum(now, &se->avg, 0, 0, 0)) {
> -		___update_load_avg(&se->avg, se_weight(se), se_runnable(se));
> +	if (___update_load_sum(now, &se->avg, 0, 0)) {
> +		___update_load_avg(&se->avg, se_weight(se));
>  		return 1;
>  	}
>  

The comment above that needs adjustment too, I think.

--- a/kernel/sched/pelt.c
+++ b/kernel/sched/pelt.c
@@ -234,28 +234,13 @@ ___update_load_avg(struct sched_avg *sa,
 /*
  * sched_entity:
  *
- *   task:
- *     se_runnable() == se_weight()
- *
- *   group: [ see update_cfs_group() ]
- *     se_weight()   = tg->weight * grq->load_avg / tg->load_avg
- *     se_runnable() = se_weight(se) * grq->runnable_load_avg / grq->load_avg
- *
  *   load_sum := runnable_sum
  *   load_avg = se_weight(se) * runnable_avg
  *
- *   runnable_load_sum := runnable_sum
- *   runnable_load_avg = se_runnable(se) * runnable_avg
- *
- * XXX collapse load_sum and runnable_load_sum
- *
  * cfq_rq:
  *
  *   load_sum = \Sum se_weight(se) * se->avg.load_sum
  *   load_avg = \Sum se->avg.load_avg
- *
- *   runnable_load_sum = \Sum se_runnable(se) * se->avg.runnable_load_sum
- *   runnable_load_avg = \Sum se->avg.runable_load_avg
  */
 
 int __update_load_avg_blocked_se(u64 now, struct sched_entity *se)