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Miller" , Eric Dumazet , Gabriele Monaco , Greg Kroah-Hartman , Ingo Molnar , Jakub Kicinski , Jens Axboe , Johannes Weiner , Lai Jiangshan , Marco Crivellari , Michal Hocko , Muchun Song , Paolo Abeni , Peter Zijlstra , Phil Auld , "Rafael J . Wysocki" , Roman Gushchin , Shakeel Butt , Simon Horman , Tejun Heo , Thomas Gleixner , Vlastimil Babka , Waiman Long , Will Deacon , cgroups@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH 22/33] sched/isolation: Remove HK_TYPE_TICK test from cpu_is_isolated() Date: Wed, 24 Dec 2025 14:45:09 +0100 Message-ID: <20251224134520.33231-23-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251224134520.33231-1-frederic@kernel.org> References: <20251224134520.33231-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam02 X-Stat-Signature: hi5gsjkxaknzw7k33sjzwanrqt79gjt6 X-Rspam-User: X-Rspamd-Queue-Id: 442ACA000F X-HE-Tag: 1766584121-824268 X-HE-Meta: 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 PDUC1eTS tsrDYy6txrvECa3AKxJwa/uNoWnYDOzS4GAn73GUCMy8urz4rcJGXJPj6mjolmnixJsRCZEk1nqs91IqdsENkw3pPyGc6stgSScz9R2mycVOc/NNsnH8BS/c+m7Yl/odCiOAj/2xcLFx1kM4s4Z97mcKoEvTgwlj4z1xAFdUTiCVGqsE4IBMnr9JGmGiQ7en07mUDtJ+3SKLMbunMFtEy7ko35XoxWeNfNADsAgco896rOeY1ZnipqvvIKC59GoQj2N5zFNE8YhILu6Wp7EzMaHe7gAX2dOWaEWW9dk/+37IAJfAxgf+cZnsjsM+sJ5w+uGoq X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: It doesn't make sense to use nohz_full without also isolating the related CPUs from the domain topology, either through the use of isolcpus= or cpuset isolated partitions. And now HK_TYPE_DOMAIN includes all kinds of domain isolated CPUs. This means that HK_TYPE_KERNEL_NOISE (of which HK_TYPE_TICK is only an alias) should always be a subset of HK_TYPE_DOMAIN. Therefore if a CPU is not HK_TYPE_DOMAIN, it shouldn't be HK_TYPE_KERNEL_NOISE either. Testing the former is then enough. Simplify cpu_is_isolated() accordingly. Signed-off-by: Frederic Weisbecker --- include/linux/sched/isolation.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h index 19905adbb705..cbb1d30f699a 100644 --- a/include/linux/sched/isolation.h +++ b/include/linux/sched/isolation.h @@ -82,8 +82,7 @@ static inline bool housekeeping_cpu(int cpu, enum hk_type type) static inline bool cpu_is_isolated(int cpu) { - return !housekeeping_test_cpu(cpu, HK_TYPE_DOMAIN) || - !housekeeping_test_cpu(cpu, HK_TYPE_TICK); + return !housekeeping_test_cpu(cpu, HK_TYPE_DOMAIN); } #endif /* _LINUX_SCHED_ISOLATION_H */ -- 2.51.1