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

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Date:	Wed, 1 Jun 2016 22:11:49 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Dietmar Eggemann <dietmar.eggemann@....com>
Cc:	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 Wed, Jun 01, 2016 at 08:39:22PM +0100, Dietmar Eggemann wrote:
> The information whether a se/cfs_rq should get its load and
> utilization (se representing a task and root cfs_rq) or only its load
> (se representing a task group and cfs_rq owned by this se) updated can
> be passed into __update_load_avg() to avoid the additional if/else
> condition to set update_util.
> 
> @running is changed to @update_util which now carries the information if
> the utilization of the se/cfs_rq should be updated and if the se/cfs_rq
> is running or not.
> 
> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>
> ---
>  kernel/sched/fair.c | 42 +++++++++++++++++++++---------------------
>  1 file changed, 21 insertions(+), 21 deletions(-)
> 
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 3ae8e79fb687..a1c13975cf56 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -2669,6 +2669,10 @@ static u32 __compute_runnable_contrib(u64 n)
>  
>  #define cap_scale(v, s) ((v)*(s) >> SCHED_CAPACITY_SHIFT)
>  
> +#define upd_util_se(se, rng) ((entity_is_task(se) << 1) | (rng))

Just saying that on first reading that went: Random Number Generator, uh
what?!

So maybe pick better names?