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Fri, 13 Nov 2026 07:04:59 -0800 (PST) Received: from andreayoga.wind3.hub ([31.189.56.146]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-49c5f1c1797sm6390874f8f.11.2026.11.13.07.04.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Nov 2026 07:04:58 -0800 (PST) From: Andrea Parri To: Mathieu Desnoyers Cc: Andrea Parri , Juri Lelli , peterz@infradead.org, mingo@redhat.com, vincent.guittot@linaro.org, linux-kernel@vger.kernel.org, tglx@kernel.org, will@kernel.org, boqun@kernel.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, kprateek.nayak@amd.com, luca.abeni@santannapisa.it, mathieu.poirier@linaro.org, longman@redhat.com, ridong.chen@linux.dev, tj@kernel.org, hannes@cmpxchg.org, mkoutny@suse.com, shuah@kernel.org, bigeasy@linutronix.de, clrkwllms@kernel.org, m.szyprowski@samsung.com, kayracizmeci@gmail.com, weihengqiuu@gmail.com, cgroups@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: Re: [PATCH v5 18/29] sched/deadline: Move a task's bandwidth only where room was made Date: Fri, 13 Nov 2026 16:04:36 +0100 Message-ID: <20261113150438.9119-1-parri.andrea@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: References: <20261108185406.1549770-1-mathieu.desnoyers@efficios.com> <20261108185406.1549770-19-mathieu.desnoyers@efficios.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Fri, Nov 13, 2026 at 08:35:03AM -0500, Mathieu Desnoyers wrote: > Hi Juri, > > > > +/* The caller made room for the deadline bandwidth in the new root domain. */ > > > +#define SCA_DL_BW_RESERVED 0x20 > > > > Why not 0x10? > > No reason. 0x10 is free. The planned next version uses it. Hi Mathieu, A heads-up, since both are under review: [1] adds SCA_DL_CHECK as 0x10, so if your next version also takes 0x10 and both get merged, the result would build with the two flags silently sharing a bit. Your plan in [2] to change the affinity check and the early exit also overlaps [1], which moves dl_task_check_affinity() into __set_cpus_allowed_ptr_locked(), right above that early exit. I'm happy to rebase [1] on your series, or the other way around, whichever is easier. [1] https://lore.kernel.org/20261105164856.29698-1-parri.andrea@gmail.com/ [2] https://lore.kernel.org/94d8d7af-b04f-4c59-ae3b-e693d4457a65@efficios.com/ Thanks, Andrea