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Mon, 08 Jun 2026 05:16:05 -0700 (PDT) Received: from victus-lab ([193.205.81.5]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4601f2ec711sm50644906f8f.12.2026.06.08.05.16.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2026 05:16:04 -0700 (PDT) From: Yuri Andriaccio To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , 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 v6 18/25] sched/rt: Update task's RT runqueue when switching scheduling class Date: Mon, 8 Jun 2026 14:15:37 +0200 Message-ID: <20260608121546.69910-19-yurand2000@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260608121546.69910-1-yurand2000@gmail.com> References: <20260608121546.69910-1-yurand2000@gmail.com> Precedence: bulk X-Mailing-List: cgroups@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Signed-off-by: Yuri Andriaccio --- kernel/sched/rt.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index a32b1f68e645..fc7af6bda3f8 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -1897,6 +1897,25 @@ void __init init_sched_rt_class(void) } } +#ifdef CONFIG_RT_GROUP_SCHED +static void switching_to_rt(struct rq *rq, struct task_struct *p) +{ + struct task_group *tg = p->sched_task_group; + int cpu = rq->cpu; + + if (tg == &root_task_group) + return; + + guard(raw_spinlock_irqsave)(dl_bw_lock_of_tg(tg)); + if (!rt_group_sched_enabled()) + tg = &root_task_group; + + p->rt.rt_rq = dl_bandwidth_read(tg)->active_context->rt_rq[cpu]; +} +#else +static void switching_to_rt(struct rq *rq, struct task_struct *p) {} +#endif + /* * When switching a task to RT, we may overload the runqueue * with RT tasks. In this case we try to push them off to @@ -2095,6 +2114,7 @@ DEFINE_SCHED_CLASS(rt) = { .get_rr_interval = get_rr_interval_rt, + .switching_to = switching_to_rt, .switched_to = switched_to_rt, .prio_changed = prio_changed_rt, -- 2.54.0