linux-kernel - [RFC PATCH V3 2/6] sched/deadline: Collect sched_dl

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Message-Id: <cb1e5f2fc80da2c7ef1017a2fee49be28fa07a94.1686239016.git.bristot@kernel.org>
Date:   Thu,  8 Jun 2023 17:58:14 +0200
From:   Daniel Bristot de Oliveira <bristot@...nel.org>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        linux-kernel@...r.kernel.org,
        Luca Abeni <luca.abeni@...tannapisa.it>,
        Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>,
        Thomas Gleixner <tglx@...utronix.de>,
        Joel Fernandes <joel@...lfernandes.org>,
        Vineeth Pillai <vineeth@...byteword.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Daniel Bristot de Oliveira <bristot@...nel.org>
Subject: [RFC PATCH V3 2/6] sched/deadline: Collect sched_dl_entity initialization

From: Peter Zijlstra <peterz@...radead.org>

Create a single function that initializes a sched_dl_entity.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
---
 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