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Mon, 08 Jun 2026 05:16:08 -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 22/25] sched/core: Execute enqueued balance callbacks when changing allowed CPUs Date: Mon, 8 Jun 2026 14:15:41 +0200 Message-ID: <20260608121546.69910-23-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: 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 1ad1efe1dca7..9e337f0090b3 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2933,6 +2933,7 @@ 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) { @@ -2951,11 +2952,13 @@ 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) @@ -3010,6 +3013,8 @@ 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 @@ -3023,16 +3028,19 @@ 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)) @@ -3043,7 +3051,12 @@ 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); -- 2.54.0