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Mon, 09 Nov 2026 08:36:51 -0800 (PST) Received: from victus-lab ([193.205.81.5]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4b96cd012e1sm138851295e9.8.2026.11.09.08.36.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Nov 2026 08:36:50 -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 17/29] sched/rt: Update task's RT runqueue when switching scheduling class Date: Mon, 9 Nov 2026 17:36:03 +0100 Message-ID: <20261109163616.195264-18-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 Signed-off-by: Yuri Andriaccio --- kernel/sched/rt.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index cf756639d9e8..b16cc77d7015 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -1926,6 +1926,27 @@ 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 (!rt_group_sched_enabled()) + return; + + if (tg == &root_task_group) { + p->rt.rt_rq = root_task_group.rt_rq[cpu]; + return; + } + + guard(raw_spinlock_irqsave)(dl_bw_lock_of_tg(tg)); + 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 @@ -2127,6 +2148,7 @@ 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, -- 2.56.0