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([2601:600:947f:f020:85dc:d2b2:c5ee:e3c4]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-4f4ac54adb9sm164334711cf.10.2025.12.26.14.16.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 26 Dec 2025 14:16:58 -0800 (PST) From: Waiman Long X-Google-Original-From: Waiman Long Message-ID: <46a613e8-cf5b-4fbc-9299-48ab1a6f347b@redhat.com> Date: Fri, 26 Dec 2025 17:16:54 -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 27/33] kthread: Rely on HK_TYPE_DOMAIN for preferred affinity management 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> <20251224134520.33231-28-frederic@kernel.org> Content-Language: en-US In-Reply-To: <20251224134520.33231-28-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: > Unbound kthreads want to run neither on nohz_full CPUs nor on domain > isolated CPUs. And since nohz_full implies domain isolation, checking > the latter is enough to verify both. > > Therefore exclude kthreads from domain isolation. > > Signed-off-by: Frederic Weisbecker > --- > kernel/kthread.c | 8 +++++--- > 1 file changed, 5 insertions(+), 3 deletions(-) > > diff --git a/kernel/kthread.c b/kernel/kthread.c > index 85ccf5bb17c9..968fa5868d21 100644 > --- a/kernel/kthread.c > +++ b/kernel/kthread.c > @@ -362,18 +362,20 @@ static void kthread_fetch_affinity(struct kthread *kthread, struct cpumask *cpum > { > const struct cpumask *pref; > > + guard(rcu)(); > + > if (kthread->preferred_affinity) { > pref = kthread->preferred_affinity; > } else { > if (kthread->node == NUMA_NO_NODE) > - pref = housekeeping_cpumask(HK_TYPE_KTHREAD); > + pref = housekeeping_cpumask(HK_TYPE_DOMAIN); > else > pref = cpumask_of_node(kthread->node); > } > > - cpumask_and(cpumask, pref, housekeeping_cpumask(HK_TYPE_KTHREAD)); > + cpumask_and(cpumask, pref, housekeeping_cpumask(HK_TYPE_DOMAIN)); > if (cpumask_empty(cpumask)) > - cpumask_copy(cpumask, housekeeping_cpumask(HK_TYPE_KTHREAD)); > + cpumask_copy(cpumask, housekeeping_cpumask(HK_TYPE_DOMAIN)); > } > > static void kthread_affine_node(void) Reviewed-by: Waiman Long