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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: Sun, 25 Jan 2026 23:45:29 +0100 Message-ID: <20260125224541.50226-23-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260125224541.50226-1-frederic@kernel.org> References: <20260125224541.50226-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: EC007C0003 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: 1yew14yq6wk3qz5cwdaeay73q544qr95 X-HE-Tag: 1769381331-993227 X-HE-Meta: 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 oxSPkMoR egtNYioI4XuS8T+YblDbk6iy9JtmNr9eRM6Y2OsBrI9r6lWFQti/xRYiV9CS95E1upmlUh4gFXeckceosO0psxwX8Wg5PYuf9QyQHb39zm+u9qsOsXDXUbL6EoCZiWqgJabXYtcq5wCf8ufNKnEUY7n3MBF8U6RdiaGlC+LfAUspjJmWSv3/NalXAURpED9Dm2wPS4Ag7UdVwiYvSTmRdS5xzDFskHdzHzrAgjTeoM8Qt32WgFrnBMkPjmWJUZ6SogHGeXPCzeS6Nxxwf/WjYihkvYt1HC4lPwrk+FPTWnH7tMNsTTFkI+LhnN3tW+91iK4ArlcNxfLby0NMF+qxkCQehhw== 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_DOMAIN should always be a subset of HK_TYPE_KERNEL_NOISE (of which HK_TYPE_TICK is only an alias). 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 Acked-by: Waiman Long --- 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 d0fb0f647318..dc3975ff1b2e 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