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Mon, 30 Jun 2025 11:47:33 -0700 (PDT) Received: from cachyos.customer.ask4.lan ([89.26.177.221]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a88c7fa751sm205862f8f.25.2025.06.30.11.47.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Jun 2025 11:47:32 -0700 (PDT) From: Marcos Garcia To: tj@kernel.org, void@manifault.com, mingo@redhat.com, peterz@infradead.org Cc: arighi@nvidia.com, changwoo@igalia.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org, Marcos Garcia Subject: [PATCH sched/ext v2] sched/ext: Implement cgroup idle state notification Date: Mon, 30 Jun 2025 20:47:09 +0200 Message-ID: <20250630184709.3831581-1-magazo2005@gmail.com> X-Mailer: git-send-email 2.50.0 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" Add scx_group_set_idle() to notify BPF schedulers when task groups become idle or active. This enables schedulers to: - Optimize resource allocation for inactive cgroups - Implement power-saving policies - Improve load balancing decisions The implementation safely invokes the BPF scheduler's cgroup_set_idle callback under RCU protection. The callback is optional - schedulers not needing this notification can omit it. Signed-off-by: Marcos Garcia --- kernel/sched/ext.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index b498d867ba21..7cecc0ca700d 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -4258,7 +4258,13 @@ void scx_group_set_weight(struct task_group *tg, uns= igned long weight) =20 void scx_group_set_idle(struct task_group *tg, bool idle) { - /* TODO: Implement ops->cgroup_set_idle() */ + struct sched_ext_ops *ops; + + rcu_read_lock(); + ops =3D rcu_dereference(ext_ops); + if (ops && ops->cgroup_set_idle) + ops->cgroup_set_idle(tg, idle); + rcu_read_unlock(); } =20 static void scx_cgroup_lock(void) --=20 2.50.0