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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 19/31] sched/isolation: Remove HK_TYPE_TICK test from cpu_is_isolated() Date: Wed, 5 Nov 2025 22:03:35 +0100 Message-ID: <20251105210348.35256-20-frederic@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251105210348.35256-1-frederic@kernel.org> References: <20251105210348.35256-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 9CD308001E X-Stat-Signature: s39p3zse3tg6sa6f4tbnoyongcnch1f6 X-Rspam-User: X-HE-Tag: 1762376793-494567 X-HE-Meta: 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 am7PbzyH HPjex2nb3VGrjn34uwRNpirgvGBYI+pzUopTsm0HqnoXnk8auqsvNvIQfbD7YQQTUOVuOLAJSraAChMtbABPeplz0HsgVq6dTBBrLSXu0dF5i8Y9gT6gnYqQUSL8ENqINCSn4efwPGcerjC5SGmHsPiDe4fbYu/24MojNB7Ir86C5mdcjWztLNKGOT/UU7DoYW2PANG7G5qAoGl3lHzN82Qleg+9ODdFq+StslbNEqEJxbqKjQgJFMLQjSFRbUpgQ7bRNQG5UVpr3tGwHP5RYY5+D12Scewvv3xffpm5hXGaUKTEkp2T9FY4fkYS++wZqBVtO 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 a127629adb32..a24acefacf9f 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 */ -- 2.51.0