linux-kernel - Re: [RFC PATCH 3/3] sched/fair: Change @running of __update_load_avg() to @update

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Date:	Fri, 3 Jun 2016 11:56:07 +0100
From:	Juri Lelli <juri.lelli@....com>
To:	Dietmar Eggemann <dietmar.eggemann@....com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Ben Segall <bsegall@...gle.com>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Yuyang Du <yuyang.du@...el.com>
Subject: Re: [RFC PATCH 3/3] sched/fair: Change @running of
 __update_load_avg() to @update_util

On 02/06/16 18:27, Dietmar Eggemann wrote:
> On 02/06/16 10:25, Juri Lelli wrote:
> 
> [...]
> 
> >> @@ -2757,7 +2754,7 @@ __update_load_avg(u64 now, int cpu, struct sched_avg *sa,
> >>  						weight * scaled_delta_w;
> >>  			}
> >>  		}
> >> -		if (update_util && running)
> >> +		if (update_util == 0x3)
> > 
> > How about a define for these masks?
> 
> Something like this?
> 
> +#define UTIL_RUNNING   1
> +#define UTIL_UPDATE    2

Make these 0x01 and 0x02, I'd say.

> +
>  /*
>   * We can represent the historical contribution to runnable average as the
>   * coefficients of a geometric series.  To do this we sub-divide our runnable
> @@ -2724,7 +2727,7 @@ static u32 __compute_runnable_contrib(u64 n)
>   */
>  static __always_inline int
>  __update_load_avg(u64 now, int cpu, struct sched_avg *sa,
> -                 unsigned long weight, int update_util, struct cfs_rq *cfs_rq)
> +                 unsigned long weight, int util_flags, struct cfs_rq *cfs_rq)
>  {
>         u64 delta, scaled_delta, periods;
>         u32 contrib;
> @@ -2775,7 +2778,7 @@ __update_load_avg(u64 now, int cpu, struct sched_avg *sa,
>                                                 weight * scaled_delta_w;
>                         }
>                 }
> -               if (update_util == 0x3)
> +               if (util_flags == (UTIL_UPDATE | UTIL_RUNNING))

Looks more readable to me. :-)

Best,

- Juri