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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 19/33] sched/isolation: Remove HK_TYPE_TICK test from cpu_is_isolated() Date: Mon, 13 Oct 2025 22:31:32 +0200 Message-ID: <20251013203146.10162-20-frederic@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251013203146.10162-1-frederic@kernel.org> References: <20251013203146.10162-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: m9eknt43uwkafe8sjqeiqd14q7rx9u6z X-Rspamd-Queue-Id: 39EC81C000A X-Rspamd-Server: rspam06 X-Rspam-User: X-HE-Tag: 1760387666-96721 X-HE-Meta: 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 hIpVzEdM aWJ0H9tf+D292v+yzbjWq3RzmMN+wiMx0R8ZI01U/T1CqrNVEbZFyIe94NSJ2K0VXUn8cCp11Y4oZRohoHD3s+41jF7C42tng1IyOpiz3uWHAUQ4v2Lbii4LqmToRPsCvZ301vIs8wvT+33X0AgQ5bvqs/a4tZOtW1AZRF4a35LEfsksgE80ertAQ8trl7Tbj3CmLgT1p5HSgqx2vZYumRMPo7ZGHf+asztQkWE/wQIw6QxY3g9wAoLSZu9rRLT60KxhEV/ZqhoLNnSXmnT13bxhaON3UYYmzEBJSrba0AV2nz9qhQlI9jDFNXCeEm72S1/Tj 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 0f50c152cf68..eef539820de2 100644 --- a/include/linux/sched/isolation.h +++ b/include/linux/sched/isolation.h @@ -75,8 +75,7 @@ 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 */ -- 2.51.0