linux-kernel - Re: [PATCH v2 1/2] sched: use existing helper functions to access ->avg_rt and ->avg

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Message-ID: <CAKfTPtDU1osT2NF8p0BDSXBdp4Qjwkt6mBQEaA9oHVd+O8zYGg@mail.gmail.com>
Date: Thu, 4 Jan 2024 15:27:42 +0100
From: Vincent Guittot <vincent.guittot@...aro.org>
To: Shrikanth Hegde <sshegde@...ux.vnet.ibm.com>
Cc: mingo@...nel.org, peterz@...radead.org, dietmar.eggemann@....com, 
	linux-kernel@...r.kernel.org, srikar@...ux.vnet.ibm.com, yu.c.chen@...el.com, 
	tim.c.chen@...ux.intel.com
Subject: Re: [PATCH v2 1/2] sched: use existing helper functions to access
 ->avg_rt and ->avg_dl

On Mon, 1 Jan 2024 at 16:49, Shrikanth Hegde <sshegde@...ux.vnet.ibm.com> wrote:
>
> There are helper functions called cpu_util_dl and cpu_util_rt which gives
> the average utilization of DL and RT respectively. But there are few
> places in code where these variables are used directly.
>
> Instead use the helper function so that code becomes simpler and easy to
> maintain later on. This patch doesn't intend any functional changes.
>
> Signed-off-by: Shrikanth Hegde <sshegde@...ux.vnet.ibm.com>

Reviewed-by: Vincent Guittot <vincent.guittot@...aro.org>

> ---
>  kernel/sched/fair.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index bcea3d55d95d..1aeca3f943a8 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -9212,10 +9212,10 @@ static inline bool cfs_rq_has_blocked(struct cfs_rq *cfs_rq)
>
>  static inline bool others_have_blocked(struct rq *rq)
>  {
> -       if (READ_ONCE(rq->avg_rt.util_avg))
> +       if (cpu_util_rt(rq))
>                 return true;
>
> -       if (READ_ONCE(rq->avg_dl.util_avg))
> +       if (cpu_util_dl(rq))
>                 return true;
>
>         if (thermal_load_avg(rq))
> @@ -9481,8 +9481,8 @@ static unsigned long scale_rt_capacity(int cpu)
>          * avg_thermal.load_avg tracks thermal pressure and the weighted
>          * average uses the actual delta max capacity(load).
>          */
> -       used = READ_ONCE(rq->avg_rt.util_avg);
> -       used += READ_ONCE(rq->avg_dl.util_avg);
> +       used = cpu_util_rt(rq);
> +       used += cpu_util_dl(rq);
>         used += thermal_load_avg(rq);
>
>         if (unlikely(used >= max))
> --
> 2.39.3
>