linux-kernel - [RFC PATCH v2 07/25] sched/rt: Introduce HCBS specific structs in task

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250731105543.40832-8-yurand2000@gmail.com>
Date: Thu, 31 Jul 2025 12:55:25 +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 07/25] 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 | 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