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([2a01:e0a:f:6020:c0d5:15dc:1ec9:3f30]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-434aa7e4d42sm47078885e9.37.2024.11.28.01.28.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Nov 2024 01:28:04 -0800 (PST) From: Vincent Guittot To: mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, linux-kernel@vger.kernel.org Cc: kprateek.nayak@amd.com, pauld@redhat.com, efault@gmx.de, luis.machado@arm.com, Vincent Guittot Subject: [PATCH 7/9] sched/fair: Do not try to migrate delayed dequeue task Date: Thu, 28 Nov 2024 10:27:48 +0100 Message-ID: <20241128092750.2541735-8-vincent.guittot@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241128092750.2541735-1-vincent.guittot@linaro.org> References: <20241128092750.2541735-1-vincent.guittot@linaro.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Migrating a delayed dequeued task doesn't help in balancing the number of runnable tasks in the system. Signed-off-by: Vincent Guittot --- kernel/sched/fair.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 1b4f1b610543..9d80f3a61082 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -9405,11 +9405,15 @@ int can_migrate_task(struct task_struct *p, struct = lb_env *env) =20 /* * We do not migrate tasks that are: - * 1) throttled_lb_pair, or - * 2) cannot be migrated to this CPU due to cpus_ptr, or - * 3) running (obviously), or - * 4) are cache-hot on their current CPU. + * 1) delayed dequeued, or + * 2) throttled_lb_pair, or + * 3) cannot be migrated to this CPU due to cpus_ptr, or + * 4) running (obviously), or + * 5) are cache-hot on their current CPU. */ + if (p->se.sched_delayed) + return 0; + if (throttled_lb_pair(task_group(p), env->src_cpu, env->dst_cpu)) return 0; =20 --=20 2.43.0