linux-kernel - [RFC PATCH v2 11/25] sched/deadline: Add dl_init

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Message-ID: <20250731105543.40832-12-yurand2000@gmail.com>
Date: Thu, 31 Jul 2025 12:55:29 +0200
From: Yuri Andriaccio <yurand2000@...il.com>
To: Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>
Cc: linux-kernel@...r.kernel.org,
	Luca Abeni <luca.abeni@...tannapisa.it>,
	Yuri Andriaccio <yuri.andriaccio@...tannapisa.it>
Subject: [RFC PATCH v2 11/25] sched/deadline: Add dl_init_tg

From: luca abeni <luca.abeni@...tannapisa.it>

This function is used to initialize and/or update a rt-cgroup dl_server, also
accounting for the allocated bandwidth.

Co-developed-by: Alessio Balsini <a.balsini@...up.it>
Signed-off-by: Alessio Balsini <a.balsini@...up.it>
Co-developed-by: Andrea Parri <parri.andrea@...il.com>
Signed-off-by: Andrea Parri <parri.andrea@...il.com>
Co-developed-by: Yuri Andriaccio <yurand2000@...il.com>
Signed-off-by: Yuri Andriaccio <yurand2000@...il.com>
Signed-off-by: luca abeni <luca.abeni@...tannapisa.it>
---
 kernel/sched/deadline.c | 33 +++++++++++++++++++++++++++++++++
 kernel/sched/sched.h    |  1 +
 2 files changed, 34 insertions(+)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index b8228f553fe..264838c4a85 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -365,6 +365,39 @@ void cancel_inactive_timer(struct sched_dl_entity *dl_se)
 	cancel_dl_timer(dl_se, &dl_se->inactive_timer);
 }
 
+#ifdef CONFIG_RT_GROUP_SCHED
+void dl_init_tg(struct sched_dl_entity *dl_se, u64 rt_runtime, u64 rt_period)
+{
+	struct rq *rq = container_of(dl_se->dl_rq, struct rq, dl);
+	int is_active;
+	u64 new_bw;
+
+	raw_spin_rq_lock_irq(rq);
+	is_active = dl_se->my_q->rt.rt_nr_running > 0;
+
+	update_rq_clock(rq);
+	dl_server_stop(dl_se);
+
+	new_bw = to_ratio(dl_se->dl_period, dl_se->dl_runtime);
+	dl_rq_change_utilization(rq, dl_se, new_bw);
+
+	dl_se->dl_runtime  = rt_runtime;
+	dl_se->dl_deadline = rt_period;
+	dl_se->dl_period   = rt_period;
+
+	dl_se->runtime = 0;
+	dl_se->deadline = 0;
+
+	dl_se->dl_bw = new_bw;
+	dl_se->dl_density = new_bw;
+
+	if (is_active)
+		dl_server_start(dl_se);
+
+	raw_spin_rq_unlock_irq(rq);
+}
+#endif
+
 static void dl_change_utilization(struct task_struct *p, u64 new_bw)
 {
 	WARN_ON_ONCE(p->dl.flags & SCHED_FLAG_SUGOV);
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 3283d824859..611e3757fea 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -394,6 +394,7 @@ extern void dl_server_init(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq,
 		    dl_server_has_tasks_f has_tasks,
 		    dl_server_pick_f pick_task);
 extern void sched_init_dl_servers(void);
+extern void dl_init_tg(struct sched_dl_entity *dl_se, u64 rt_runtime, u64 rt_period);
 
 extern void dl_server_update_idle_time(struct rq *rq,
 		    struct task_struct *p);
-- 
2.50.1