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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 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> In-Reply-To: <20251224134520.33231-29-frederic@kernel.org> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: O-NQt2QVK9LAmfIh1f-WkWUQlXgJ1W0Lx-vHtBcNXeU_1766790532 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: fqz67ayphtdesu7pnf6xawdwcg8fgtas X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 6D32316000C X-Rspam-User: X-HE-Tag: 1766790534-409914 X-HE-Meta: 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 LHgMVihe 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 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: > 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