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Mon, 01 Dec 2025 04:42:15 -0800 (PST) Received: from victus-lab ([193.205.81.5]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b76f59e8612sm1173738266b.52.2025.12.01.04.42.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Dec 2025 04:42:15 -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 09/28] sched/deadline: Add dl_init_tg Date: Mon, 1 Dec 2025 13:41:42 +0100 Message-ID: <20251201124205.11169-10-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 Add dl_init_tg to initialize and/or update a rt-cgroup dl_server and to also account the allocated bandwidth. This function is currently unhooked and will be later used to allocate bandwidth to rt-cgroups. Add lock guard for raw_spin_rq_lock_irq for cleaner code. 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/deadline.c | 31 +++++++++++++++++++++++++++++++ kernel/sched/sched.h | 5 +++++ 2 files changed, 36 insertions(+) diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 3046148c94..4f43883a65 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -340,6 +340,37 @@ void cancel_inactive_timer(struct sched_dl_entity *dl_= se) cancel_dl_timer(dl_se, &dl_se->inactive_timer); } =20 +#ifdef CONFIG_RT_GROUP_SCHED +void dl_init_tg(struct sched_dl_entity *dl_se, u64 rt_runtime, u64 rt_peri= od) +{ + struct rq *rq =3D container_of(dl_se->dl_rq, struct rq, dl); + int is_active; + u64 new_bw; + + guard(raw_spin_rq_lock_irq)(rq); + is_active =3D dl_se->my_q->rt.rt_nr_running > 0; + + update_rq_clock(rq); + dl_server_stop(dl_se); + + new_bw =3D to_ratio(rt_period, rt_runtime); + dl_rq_change_utilization(rq, dl_se, new_bw); + + dl_se->dl_runtime =3D rt_runtime; + dl_se->dl_deadline =3D rt_period; + dl_se->dl_period =3D rt_period; + + dl_se->runtime =3D 0; + dl_se->deadline =3D 0; + + dl_se->dl_bw =3D new_bw; + dl_se->dl_density =3D new_bw; + + if (is_active) + dl_server_start(dl_se); +} +#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 6f6e39a628..f42bef06a9 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -419,6 +419,7 @@ extern void dl_server_init(struct sched_dl_entity *dl_s= e, struct dl_rq *dl_rq, struct rq *served_rq, 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); =20 extern void dl_server_update_idle_time(struct rq *rq, struct task_struct *p); @@ -1922,6 +1923,10 @@ DEFINE_LOCK_GUARD_1(rq_lock_irqsave, struct rq, rq_unlock_irqrestore(_T->lock, &_T->rf), struct rq_flags rf) =20 +DEFINE_LOCK_GUARD_1(raw_spin_rq_lock_irq, struct rq, + raw_spin_rq_lock_irq(_T->lock), + raw_spin_rq_unlock_irq(_T->lock)) + static inline struct rq *this_rq_lock_irq(struct rq_flags *rf) __acquires(rq->lock) { --=20 2.51.0