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Mon, 09 Nov 2026 08:36:38 -0800 (PST) Received: from victus-lab ([193.205.81.5]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4b96cd012e1sm138851295e9.8.2026.11.09.08.36.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Nov 2026 08:36:37 -0800 (PST) From: Yuri Andriaccio To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , K Prateek Nayak , Tejun Heo , Johannes Weiner , =?UTF-8?q?Michal=20Koutn=C3=BD?= Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, Luca Abeni , Yuri Andriaccio Subject: [RFC PATCH v7 10/29] sched/deadline: Add dl_init_tg Date: Mon, 9 Nov 2026 17:35:56 +0100 Message-ID: <20261109163616.195264-11-yurand2000@gmail.com> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261109163616.195264-1-yurand2000@gmail.com> References: <20261109163616.195264-1-yurand2000@gmail.com> X-Mailing-List: cgroups@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 | 1 + 2 files changed, 32 insertions(+) diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index aceeb28d4b2b..b6b5fcb15f43 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -335,6 +335,37 @@ void cancel_inactive_timer(struct sched_dl_entity *dl_se) cancel_dl_timer(dl_se, &dl_se->inactive_timer); } +#ifdef CONFIG_RT_GROUP_SCHED +void dl_init_tg(struct sched_dl_entity *dl_se, u64 rt_runtime, u64 rt_period) +{ + struct rq *rq = container_of_const(dl_se->dl_rq, struct rq, dl); + int is_active; + u64 new_bw; + + guard(rq_lock_irq)(rq); + is_active = dl_se->my_q->rt.rt_nr_running > 0; + + update_rq_clock(rq); + dl_server_stop(dl_se); + + new_bw = to_ratio(rt_period, rt_runtime); + dl_rq_change_utilization(rq, dl_se, new_bw); + + dl_se->dl_runtime = rt_runtime; + dl_se->dl_deadline = rt_period; + dl_se->dl_period = rt_period; + + dl_se->runtime = 0; + dl_se->deadline = 0; + + dl_se->dl_bw = new_bw; + dl_se->dl_density = 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 e8a62b37a72d..b55ce13412d6 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -425,6 +425,7 @@ extern void dl_server_init(struct sched_dl_entity *dl_se, 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); extern void fair_server_init(struct rq *rq); extern void ext_server_init(struct rq *rq); -- 2.56.0