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Mon, 01 Dec 2025 04:42:13 -0800 (PST) Received: from victus-lab ([193.205.81.5]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b76f59e8612sm1173738266b.52.2025.12.01.04.42.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Dec 2025 04:42:13 -0800 (PST) From: Yuri Andriaccio To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider Cc: linux-kernel@vger.kernel.org, Luca Abeni , Yuri Andriaccio Subject: [RFC PATCH v4 07/28] sched/rt: Introduce HCBS specific structs in task_group Date: Mon, 1 Dec 2025 13:41:40 +0100 Message-ID: <20251201124205.11169-8-yurand2000@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251201124205.11169-1-yurand2000@gmail.com> References: <20251201124205.11169-1-yurand2000@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: luca abeni 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 Signed-off-by: Alessio Balsini Co-developed-by: Andrea Parri Signed-off-by: Andrea Parri Co-developed-by: Yuri Andriaccio Signed-off-by: Yuri Andriaccio Signed-off-by: luca abeni --- kernel/sched/sched.h | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 1896c4e247..75a3dc475b 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 >=3D 0; @@ -492,10 +499,17 @@ 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; @@ -845,12 +859,16 @@ 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 runna= ble entities */ #endif + + /* + * The cgroup's served runqueue if the rt_rq entity belongs to a cgroup, + * otherwise the top-level global runqueue. + */ + struct rq *rq; }; static inline bool rt_rq_is_runnable(struct rt_rq *rt_rq) -- 2.51.0