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([2601:600:947f:f020:85dc:d2b2:c5ee:e3c4]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-4f4d5b4c975sm115870181cf.1.2025.12.26.14.13.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 26 Dec 2025 14:13:29 -0800 (PST) From: Waiman Long X-Google-Original-From: Waiman Long Message-ID: <48f8bff9-178c-4ab7-a8ef-7edba9b0e7bb@redhat.com> Date: Fri, 26 Dec 2025 17:13:25 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 26/33] kthread: Include kthreadd to the managed affinity list 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> <20251224134520.33231-27-frederic@kernel.org> In-Reply-To: <20251224134520.33231-27-frederic@kernel.org> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: ucwCj4tfnJ7z_WTrChE_nt0_vgR48l4OT1isCWYcgRg_1766787210 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: CD01340004 X-Stat-Signature: 6s6u6pdcbqk9ykg4gbjhfybxdjz4c9t6 X-Rspam-User: X-HE-Tag: 1766787212-126627 X-HE-Meta: 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 Tj+Fh3lL 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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: > The unbound kthreads affinity management performed by cpuset is going to > be imported to the kthread core code for consolidation purposes. > > Treat kthreadd just like any other kthread. > > Signed-off-by: Frederic Weisbecker > --- > kernel/kthread.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/kernel/kthread.c b/kernel/kthread.c > index 51c0908d3d02..85ccf5bb17c9 100644 > --- a/kernel/kthread.c > +++ b/kernel/kthread.c > @@ -818,12 +818,13 @@ int kthreadd(void *unused) > /* Setup a clean context for our children to inherit. */ > set_task_comm(tsk, comm); > ignore_signals(tsk); > - set_cpus_allowed_ptr(tsk, housekeeping_cpumask(HK_TYPE_KTHREAD)); > set_mems_allowed(node_states[N_MEMORY]); > > current->flags |= PF_NOFREEZE; > cgroup_init_kthreadd(); > > + kthread_affine_node(); > + > for (;;) { > set_current_state(TASK_INTERRUPTIBLE); > if (list_empty(&kthread_create_list)) Reviewed-by: Waiman Long