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Date:   Tue, 13 Jun 2023 09:25:50 -0400
From:   Phil Auld <pauld@redhat.com>
To:     Daniel Bristot de Oliveira <bristot@kernel.org>
Cc:     Ingo Molnar <mingo@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Juri Lelli <juri.lelli@redhat.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
        Daniel Bristot de Oliveira <bristot@redhat.com>,
        Valentin Schneider <vschneid@redhat.com>,
        linux-kernel@vger.kernel.org,
        Luca Abeni <luca.abeni@santannapisa.it>,
        Tommaso Cucinotta <tommaso.cucinotta@santannapisa.it>,
        Thomas Gleixner <tglx@linutronix.de>,
        Joel Fernandes <joel@joelfernandes.org>,
        Vineeth Pillai <vineeth@bitbyteword.org>,
        Shuah Khan <skhan@linuxfoundation.org>
Subject: Re: [RFC PATCH V3 2/6] sched/deadline: Collect sched_dl_entity
 initialization
Message-ID: <20230613132550.GD536267@lorien.usersys.redhat.com>
References: <cover.1686239016.git.bristot@kernel.org>
 <cb1e5f2fc80da2c7ef1017a2fee49be28fa07a94.1686239016.git.bristot@kernel.org>
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On Thu, Jun 08, 2023 at 05:58:14PM +0200 Daniel Bristot de Oliveira wrote:
> From: Peter Zijlstra <peterz@infradead.org>
> 
> Create a single function that initializes a sched_dl_entity.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>

Reviewed-by: Phil Auld <pauld@redhat.com>

> ---
>  kernel/sched/core.c     |  5 +----
>  kernel/sched/deadline.c | 22 +++++++++++++++-------
>  kernel/sched/sched.h    |  5 +----
>  3 files changed, 17 insertions(+), 15 deletions(-)
> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index ac38225e6d09..e34b02cbe41f 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -4511,10 +4511,7 @@ static void __sched_fork(unsigned long clone_flags, struct task_struct *p)
>  	memset(&p->stats, 0, sizeof(p->stats));
>  #endif
>  
> -	RB_CLEAR_NODE(&p->dl.rb_node);
> -	init_dl_task_timer(&p->dl);
> -	init_dl_inactive_task_timer(&p->dl);
> -	__dl_clear_params(p);
> +	init_dl_entity(&p->dl);
>  
>  	INIT_LIST_HEAD(&p->rt.run_list);
>  	p->rt.timeout		= 0;
> diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
> index 030e7c11607f..22e5e64812c9 100644
> --- a/kernel/sched/deadline.c
> +++ b/kernel/sched/deadline.c
> @@ -333,6 +333,8 @@ static void dl_change_utilization(struct task_struct *p, u64 new_bw)
>  	__add_rq_bw(new_bw, &rq->dl);
>  }
>  
> +static void __dl_clear_params(struct sched_dl_entity *dl_se);
> +
>  /*
>   * The utilization of a task cannot be immediately removed from
>   * the rq active utilization (running_bw) when the task blocks.
> @@ -432,7 +434,7 @@ static void task_non_contending(struct task_struct *p)
>  			raw_spin_lock(&dl_b->lock);
>  			__dl_sub(dl_b, p->dl.dl_bw, dl_bw_cpus(task_cpu(p)));
>  			raw_spin_unlock(&dl_b->lock);
> -			__dl_clear_params(p);
> +			__dl_clear_params(dl_se);
>  		}
>  
>  		return;
> @@ -1205,7 +1207,7 @@ static enum hrtimer_restart dl_task_timer(struct hrtimer *timer)
>  	return HRTIMER_NORESTART;
>  }
>  
> -void init_dl_task_timer(struct sched_dl_entity *dl_se)
> +static void init_dl_task_timer(struct sched_dl_entity *dl_se)
>  {
>  	struct hrtimer *timer = &dl_se->dl_timer;
>  
> @@ -1415,7 +1417,7 @@ static enum hrtimer_restart inactive_task_timer(struct hrtimer *timer)
>  		raw_spin_lock(&dl_b->lock);
>  		__dl_sub(dl_b, p->dl.dl_bw, dl_bw_cpus(task_cpu(p)));
>  		raw_spin_unlock(&dl_b->lock);
> -		__dl_clear_params(p);
> +		__dl_clear_params(dl_se);
>  
>  		goto unlock;
>  	}
> @@ -1431,7 +1433,7 @@ static enum hrtimer_restart inactive_task_timer(struct hrtimer *timer)
>  	return HRTIMER_NORESTART;
>  }
>  
> -void init_dl_inactive_task_timer(struct sched_dl_entity *dl_se)
> +static void init_dl_inactive_task_timer(struct sched_dl_entity *dl_se)
>  {
>  	struct hrtimer *timer = &dl_se->inactive_timer;
>  
> @@ -2974,10 +2976,8 @@ bool __checkparam_dl(const struct sched_attr *attr)
>  /*
>   * This function clears the sched_dl_entity static params.
>   */
> -void __dl_clear_params(struct task_struct *p)
> +static void __dl_clear_params(struct sched_dl_entity *dl_se)
>  {
> -	struct sched_dl_entity *dl_se = &p->dl;
> -
>  	dl_se->dl_runtime		= 0;
>  	dl_se->dl_deadline		= 0;
>  	dl_se->dl_period		= 0;
> @@ -2995,6 +2995,14 @@ void __dl_clear_params(struct task_struct *p)
>  #endif
>  }
>  
> +void init_dl_entity(struct sched_dl_entity *dl_se)
> +{
> +	RB_CLEAR_NODE(&dl_se->rb_node);
> +	init_dl_task_timer(dl_se);
> +	init_dl_inactive_task_timer(dl_se);
> +	__dl_clear_params(dl_se);
> +}
> +
>  bool dl_param_changed(struct task_struct *p, const struct sched_attr *attr)
>  {
>  	struct sched_dl_entity *dl_se = &p->dl;
> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index da0cec2fc63a..fa6512070fa7 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -284,8 +284,6 @@ struct rt_bandwidth {
>  	unsigned int		rt_period_active;
>  };
>  
> -void __dl_clear_params(struct task_struct *p);
> -
>  static inline int dl_bandwidth_enabled(void)
>  {
>  	return sysctl_sched_rt_runtime >= 0;
> @@ -2390,8 +2388,7 @@ extern struct rt_bandwidth def_rt_bandwidth;
>  extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime);
>  extern bool sched_rt_bandwidth_account(struct rt_rq *rt_rq);
>  
> -extern void init_dl_task_timer(struct sched_dl_entity *dl_se);
> -extern void init_dl_inactive_task_timer(struct sched_dl_entity *dl_se);
> +extern void init_dl_entity(struct sched_dl_entity *dl_se);
>  
>  #define BW_SHIFT		20
>  #define BW_UNIT			(1 << BW_SHIFT)
> -- 
> 2.40.1
> 

--