From: luca abeni <luca.abeni@santannapisa.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@sssup.it>
Signed-off-by: Alessio Balsini <a.balsini@sssup.it>
Co-developed-by: Andrea Parri <parri.andrea@gmail.com>
Signed-off-by: Andrea Parri <parri.andrea@gmail.com>
Co-developed-by: Yuri Andriaccio <yurand2000@gmail.com>
Signed-off-by: Yuri Andriaccio <yurand2000@gmail.com>
Signed-off-by: luca abeni <luca.abeni@santannapisa.it>
---
 kernel/sched/sched.h | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 2f9035cb9e5..2a7601d400c 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;
@@ -467,9 +474,15 @@ struct task_group {
 
 #ifdef CONFIG_RT_GROUP_SCHED
 	struct sched_rt_entity	**rt_se;
+	/*
+	 * The scheduling entities for the task group are managed as a single
+	 * sched_dl_entity, each of them sharing the same dl_bandwidth.
+	 */
+	struct sched_dl_entity	**dl_se;
 	struct rt_rq		**rt_rq;
 
 	struct rt_bandwidth	rt_bandwidth;
+	struct dl_bandwidth	dl_bandwidth;
 #endif
 
 #ifdef CONFIG_EXT_GROUP_SCHED
@@ -819,12 +832,12 @@ 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)
-- 
2.50.1

Hi!

On 31/07/25 12:55, Yuri Andriaccio wrote:

...

> @@ -467,9 +474,15 @@ struct task_group {
>  
>  #ifdef CONFIG_RT_GROUP_SCHED
>  	struct sched_rt_entity	**rt_se;
> +	/*
> +	 * The scheduling entities for the task group are managed as a single
> +	 * sched_dl_entity, each of them sharing the same dl_bandwidth.
> +	 */
> +	struct sched_dl_entity	**dl_se;

This is actually one sched_dl_entity per CPU, right? If that is the case
the comment is a little misleading I am afraid (mentioning single
entitiy).

Thanks,
Juri