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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: Thu, 1 Jan 2026 23:13:47 +0100 Message-ID: <20260101221359.22298-23-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260101221359.22298-1-frederic@kernel.org> References: <20260101221359.22298-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: C8A004000A X-Rspamd-Server: rspam03 X-Stat-Signature: ypfxoyqjtx7g183spw197jfmugdpht74 X-Rspam-User: X-HE-Tag: 1767305834-140877 X-HE-Meta: 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 hH/LeVhl f0RYSKxmP+CWN3SEf+hIX25HTo0VwpZf4jJKvkQvxjxqrj6bHyQa05oXqXz4f/nYpSxv1nicj6nD8YV2HF05K5iJZioHHO6Ns2COCod0x8lc1Gxsu/Yp7yxjaWF33AbcPZfqa+H2FNlOJpPTOr1yhvdd6VeJkwTsm+pIMfMsS7snNy6qi/0/41We/2OkZWjCXV+/QjPhLMFLqEvik4/4ESXXxQgAgNXW7rq0nURcmgPspt2wIJjBk+flFwzLmCSWzE4ZmB/A8v0liWbZGUMUxC+LIFX3zrNn9xEuZxS7bp2sGSDOJzKyHgiNYbpdvkNGJQT1H7WXrWB+trR5y+do4XUH49w== 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 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