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([2601:600:947f:f020:85dc:d2b2:c5ee:e3c4]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-88d99d7dc1esm173664886d6.39.2025.12.26.15.08.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 26 Dec 2025 15:08:50 -0800 (PST) From: Waiman Long X-Google-Original-From: Waiman Long Message-ID: <2f892ef9-1965-486d-beab-eacf0b6b0386@redhat.com> Date: Fri, 26 Dec 2025 18:08:43 -0500 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 28/33] sched: Switch the fallback task allowed cpumask to HK_TYPE_DOMAIN 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> <20251224134520.33231-29-frederic@kernel.org> Content-Language: en-US In-Reply-To: <20251224134520.33231-29-frederic@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 12/24/25 8:45 AM, Frederic Weisbecker wrote: > Tasks that have all their allowed CPUs offline don't want their affinity > to fallback on either nohz_full CPUs or on domain isolated CPUs. And > since nohz_full implies domain isolation, checking the latter is enough > to verify both. > > Therefore exclude domain isolation from fallback task affinity. > > Signed-off-by: Frederic Weisbecker > --- > include/linux/mmu_context.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/linux/mmu_context.h b/include/linux/mmu_context.h > index ac01dc4eb2ce..ed3dd0f3fe19 100644 > --- a/include/linux/mmu_context.h > +++ b/include/linux/mmu_context.h > @@ -24,7 +24,7 @@ static inline void leave_mm(void) { } > #ifndef task_cpu_possible_mask > # define task_cpu_possible_mask(p) cpu_possible_mask > # define task_cpu_possible(cpu, p) true > -# define task_cpu_fallback_mask(p) housekeeping_cpumask(HK_TYPE_TICK) > +# define task_cpu_fallback_mask(p) housekeeping_cpumask(HK_TYPE_DOMAIN) > #else > # define task_cpu_possible(cpu, p) cpumask_test_cpu((cpu), task_cpu_possible_mask(p)) > #endif Acked-by: Waiman Long