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Mon, 29 Sep 2025 02:22:40 -0700 (PDT) Received: from victus-lab ([193.205.81.5]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b3e89655b09sm181082366b.77.2025.09.29.02.22.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Sep 2025 02:22:39 -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 v3 22/24] sched/deadline: Fix HCBS migrations on server stop Date: Mon, 29 Sep 2025 11:22:19 +0200 Message-ID: <20250929092221.10947-23-yurand2000@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250929092221.10947-1-yurand2000@gmail.com> References: <20250929092221.10947-1-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: quoted-printable Content-Type: text/plain; charset="utf-8" From: luca abeni Do not unthrottle a non-fair-server dl_server_stop(), since it ends up being stopped when throttled (we try to migrate all the RT tasks away from it). Notes: This is a temporary workaround, but it will be hopefully removed in favor of less invasive code. Co-developed-by: Yuri Andriaccio Signed-off-by: Yuri Andriaccio Signed-off-by: luca abeni --- kernel/sched/deadline.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 27a5d5ffd39..6435a94159d 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -1707,9 +1707,11 @@ void dl_server_stop(struct sched_dl_entity *dl_se) return; =20 dequeue_dl_entity(dl_se, DEQUEUE_SLEEP); - hrtimer_try_to_cancel(&dl_se->dl_timer); + if (dl_se =3D=3D &rq_of_dl_se(dl_se)->fair_server) { + hrtimer_try_to_cancel(&dl_se->dl_timer); + dl_se->dl_throttled =3D 0; + } dl_se->dl_defer_armed =3D 0; - dl_se->dl_throttled =3D 0; dl_se->dl_server_active =3D 0; } =20 --=20 2.51.0