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Mon, 09 Nov 2026 08:36:56 -0800 (PST) Received: from victus-lab ([193.205.81.5]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4b96cd012e1sm138851295e9.8.2026.11.09.08.36.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Nov 2026 08:36:55 -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 21/29] sched/core: Execute enqueued balance callbacks when changing allowed CPUs Date: Mon, 9 Nov 2026 17:36:07 +0100 Message-ID: <20261109163616.195264-22-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: linux-kernel@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 Execute balancing callbacks when setting the affinity of a task, since the HCBS scheduler may request balancing of throttled dl_servers to fully utilize the server's bandwidth. Signed-off-by: luca abeni Signed-off-by: Yuri Andriaccio --- kernel/sched/core.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 62039972ded6..aef019cef859 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3019,6 +3019,7 @@ static int affine_move_task(struct rq *rq, struct task_struct *p, struct rq_flag if (cpumask_test_cpu(task_cpu(p), &p->cpus_mask) || (task_current_donor(rq, p) && !task_current(rq, p))) { struct task_struct *push_task = NULL; + struct balance_callback *head; if ((flags & SCA_MIGRATE_ENABLE) && (p->migration_flags & MDF_PUSH) && !rq->push_busy) { @@ -3037,11 +3038,13 @@ static int affine_move_task(struct rq *rq, struct task_struct *p, struct rq_flag } preempt_disable(); + head = splice_balance_callbacks(rq); task_rq_unlock(rq, p, rf); if (push_task) { stop_one_cpu_nowait(rq->cpu, push_cpu_stop, p, &rq->push_work); } + balance_callbacks(rq, head); preempt_enable(); if (complete) @@ -3096,6 +3099,8 @@ static int affine_move_task(struct rq *rq, struct task_struct *p, struct rq_flag } if (task_on_cpu(rq, p) || READ_ONCE(p->__state) == TASK_WAKING) { + struct balance_callback *head; + /* * MIGRATE_ENABLE gets here because 'p == current', but for * anything else we cannot do is_migration_disabled(), punt @@ -3109,16 +3114,19 @@ static int affine_move_task(struct rq *rq, struct task_struct *p, struct rq_flag p->migration_flags &= ~MDF_PUSH; preempt_disable(); + head = splice_balance_callbacks(rq); task_rq_unlock(rq, p, rf); if (!stop_pending) { stop_one_cpu_nowait(cpu_of(rq), migration_cpu_stop, &pending->arg, &pending->stop_work); } + balance_callbacks(rq, head); preempt_enable(); if (flags & SCA_MIGRATE_ENABLE) return 0; } else { + struct balance_callback *head; if (!is_migration_disabled(p)) { if (task_on_rq_queued(p)) @@ -3129,7 +3137,12 @@ static int affine_move_task(struct rq *rq, struct task_struct *p, struct rq_flag complete = true; } } + + preempt_disable(); + head = splice_balance_callbacks(rq); task_rq_unlock(rq, p, rf); + balance_callbacks(rq, head); + preempt_enable(); if (complete) complete_all(&pending->done); -- 2.56.0