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Date: Thu, 31 Jul 2025 12:55:26 +0200 Message-ID: <20250731105543.40832-9-yurand2000@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250731105543.40832-1-yurand2000@gmail.com> References: <20250731105543.40832-1-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 Account the rt-cgroups hierarchy's reserved bandwidth in the schedulability test of deadline entities. This mechanism allows to completely reserve port= ion of the rt-bandwidth to rt-cgroups even if they do not use all of it. Co-developed-by: Alessio Balsini Signed-off-by: Alessio Balsini Co-developed-by: Andrea Parri Signed-off-by: Andrea Parri Co-developed-by: Yuri Andriaccio Signed-off-by: Yuri Andriaccio Signed-off-by: luca abeni --- kernel/sched/deadline.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 0640d0ca45b..43af48038b9 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -231,8 +231,15 @@ void __dl_add(struct dl_bw *dl_b, u64 tsk_bw, int cpus) static inline bool __dl_overflow(struct dl_bw *dl_b, unsigned long cap, u64 old_bw, u64 new_b= w) { + u64 dl_groups_root =3D 0; + +#ifdef CONFIG_RT_GROUP_SCHED + dl_groups_root =3D to_ratio(root_task_group.dl_bandwidth.dl_period, + root_task_group.dl_bandwidth.dl_runtime); +#endif return dl_b->bw !=3D -1 && - cap_scale(dl_b->bw, cap) < dl_b->total_bw - old_bw + new_bw; + cap_scale(dl_b->bw, cap) < dl_b->total_bw - old_bw + new_bw + + cap_scale(dl_groups_root, cap); } =20 static inline --=20 2.50.1