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([2601:600:947f:f020:85dc:d2b2:c5ee:e3c4]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-88d9aa3ac8fsm175993226d6.56.2025.12.26.13.26.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 26 Dec 2025 13:26:59 -0800 (PST) From: Waiman Long X-Google-Original-From: Waiman Long Message-ID: Date: Fri, 26 Dec 2025 16:26:55 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 22/33] sched/isolation: Remove HK_TYPE_TICK test from cpu_is_isolated() To: Frederic Weisbecker , LKML Cc: =?UTF-8?Q?Michal_Koutn=C3=BD?= , Andrew Morton , Bjorn Helgaas , Catalin Marinas , Chen Ridong , Danilo Krummrich , "David S . 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 , 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 References: <20251224134520.33231-1-frederic@kernel.org> <20251224134520.33231-23-frederic@kernel.org> In-Reply-To: <20251224134520.33231-23-frederic@kernel.org> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 4Y2RNHU6P_wXSs7uyrzLdCOh8sDNytUjMYo9A_iXulI_1766784421 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 1B89040005 X-Stat-Signature: z8s9anrc4dboyh5brejmraqqoc594icw X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1766784422-103440 X-HE-Meta: U2FsdGVkX19t5/kPfFJO2W4psNL6lhKrv2O/SqO8IowLq0REEAOWu4IgdGfnbqRjQGw6A+4G3ccf2b9Y+p6CGhkhbJVWmRSnDvaNT0hA8/tVlwTF2AWIY4dGMhNXcVOpqEZOr1fT41WPEEltiLAfQN6U+da/xaZTjO9AE14DWIuPLbj934DtIXUaGwe1iZ46CnnH4M8P8+E05uEiPF2slsAVpESSwi0isxHNKmr5pxqFHZYFj3TMZptOVMHCZc3yAYluzNIlAkLEpSZKiROGuv0LI7QIdZs5E4VcvfYcJRAD20vfgbDD3a6m6i/F0GETNxYG3hcWzJs3CMHBlfB2nUWSwklMP0EqGdXeT9E0dJrG+JkXxn0BfXhX3SFFzm5rVMbl1WW70VJ14LPgNV0qwC8zVFWhgYX+ierYHVgLmrdfE2CELrP3VbCyFx+72JoBiHxC5hBOVLPIKXFv/JcVzxT+qQMVVQK/0qiLtAQgwo/HraQhzIOtnuiQQX5voUBpew0v1O0+eo/eAb1QuK2qGc6eLomw1JbPwh4R4gBq2tw1SOzCkM94on5QEkySdlnxt1povBVld63yOn5dwQfTmF2fi0dXj7YMlPMZecvlq0UGRzxcOrCwaXOu9xOQHQll92esn08uogwfGCbNo2Xn9qTQfpxLUIgnMhz+tnatW0WOofCr2tJE0TkH2AhLzYTtcBSEyjM0pLZKSntB1Xijc+7MQ1P+RXfw8Ykm3EivwUJEqPy8J3aC2soI4E4WGX44pXqdwmxB+HwUt8b59bkIcl2Z9ppYVhPnnxrVSTdq9wfNi4HydFFhY6V41NvoOnIW3mrvpwfGGb6t6Yygb1yBENFhsE5sZVqSfK+H2cZLX/1VK8Ko8az+bA0mrxgKvPmPYXyTFjN0jn3nbJfh1QWO9BgJW6XrLt8gS5IBJbDFQHyMs7bz2wBydIW10s23Q5S+b3vNiV1lAm6JhcHqa1m sbYh33g4 QRW8qPD5zZ04Wjk9q5cC5zJO3/mpYcmj0yUVoHiW8lRHUVWxCa5/E/LDikfas/sl6NHhtxNcCYQE4epikv0+VZe1axpgtqWn9LCVny/vPrOo7D/KBBK/ZziwB0XqpN+jaYOIyWVecU4Xfvj9g/AxzfA6OEFdq1JlODU//DHLr7+foobIVeMKqGrbeAQa3nidM01gzF4lhuawvPvegqKdQfja2MzRGlNTDw1xQzgsTf4nT1KU+/pIzhPUaWn0hyjiMKUOiVhRyJX2qHDjG2YwkTT/rkCcuuns9IJ5NIUTxJFunOSkgWn7RfzZLxAVfhMWBPhaHYRakAQSgYR+vY6uMqc9LqrwLX0Min1W+gcVrETjfuNaAUbQgJSRuJa4kPpJfA74Qa2O+CUh3QB5eBfHGgrQ3dIJkeZDDAfxscno8G4bF2fC7JJaEPgnysQUs78tBjh3V9+eM8I4GkwfPkdsbjl9+4DnZbPQbwWEoyBSgC3MrBoY3XZlN3nNCgqyGBs9O7LSb6SniZt1UyJVX3Z+rPw5fZoRUVlR4U2yR4XrDFjAjHGUOVJp8jdTvj3YX86HCa06asjEHZPEM1ok= 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: On 12/24/25 8:45 AM, Frederic Weisbecker wrote: > 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 */ Acked-by: Waiman Long