linux-kernel - [RFC PATCH v3 06/24] sched/rt: Introduce HCBS specific structs in task

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Message-ID: <20250929092221.10947-7-yurand2000@gmail.com>
Date: Mon, 29 Sep 2025 11:22:03 +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 v3 06/24] sched/rt: Introduce HCBS specific structs in task_group

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

Each task_group manages a number of new objects:
- a sched_dl_entity/dl_server for each CPU
- a dl_bandwidth object to keep track of its allocated dl_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/sched.h | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 2d373a1ba67..59a154505d8 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -319,6 +319,13 @@ struct rt_bandwidth {
 	unsigned int		rt_period_active;
 };
 
+struct dl_bandwidth {
+	raw_spinlock_t          dl_runtime_lock;
+	u64                     dl_runtime;
+	u64                     dl_period;
+};
+
+
 static inline int dl_bandwidth_enabled(void)
 {
 	return sysctl_sched_rt_runtime >= 0;
@@ -467,10 +474,17 @@ struct task_group {
 #endif /* CONFIG_FAIR_GROUP_SCHED */
 
 #ifdef CONFIG_RT_GROUP_SCHED
+	/*
+	 * Each task group manages a different scheduling entity per CPU, i.e. a
+	 * different deadline server, and a runqueue per CPU. All the dl-servers
+	 * share the same dl_bandwidth object.
+	 */
 	struct sched_rt_entity	**rt_se;
+	struct sched_dl_entity	**dl_se;
 	struct rt_rq		**rt_rq;
 
 	struct rt_bandwidth	rt_bandwidth;
+	struct dl_bandwidth	dl_bandwidth;
 #endif
 
 	struct scx_task_group	scx;
@@ -817,12 +831,12 @@ struct rt_rq {
 	raw_spinlock_t		rt_runtime_lock;
 
 	unsigned int		rt_nr_boosted;
-
-	struct rq		*rq; /* this is always top-level rq, cache? */
 #endif
 #ifdef CONFIG_CGROUP_SCHED
 	struct task_group	*tg; /* this tg has "this" rt_rq on given CPU for runnable entities */
 #endif
+
+	struct rq		*rq; /* cgroup's runqueue if the rt_rq entity belongs to a cgroup, otherwise top-level rq */
 };
 
 static inline bool rt_rq_is_runnable(struct rt_rq *rt_rq)
-- 
2.51.0