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Thu, 30 Apr 2026 14:39:19 -0700 (PDT) Received: from yuri-framework13 ([78.211.51.156]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-44a9879ef89sm418510f8f.30.2026.04.30.14.39.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Apr 2026 14:39:18 -0700 (PDT) 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 v5 24/29] sched/core: Execute enqueued balance callbacks when changing allowed CPUs Date: Thu, 30 Apr 2026 23:38:28 +0200 Message-ID: <20260430213835.62217-25-yurand2000@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260430213835.62217-1-yurand2000@gmail.com> References: <20260430213835.62217-1-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: 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 fd532bb46995..24ffe933527c 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2875,6 +2875,7 @@ 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) { @@ -2893,11 +2894,13 @@ 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) @@ -2952,6 +2955,8 @@ 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 @@ -2965,16 +2970,19 @@ 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)) @@ -2985,7 +2993,12 @@ 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); -- 2.53.0