linux-kernel - Re: [PATCH 26/33] kthread: Include kthreadd to the managed affinity list

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Message-ID: <48f8bff9-178c-4ab7-a8ef-7edba9b0e7bb@redhat.com>
Date: Fri, 26 Dec 2025 17:13:25 -0500
From: Waiman Long <llong@...hat.com>
To: Frederic Weisbecker <frederic@...nel.org>,
 LKML <linux-kernel@...r.kernel.org>
Cc: Michal Koutný <mkoutny@...e.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Bjorn Helgaas <bhelgaas@...gle.com>,
 Catalin Marinas <catalin.marinas@....com>,
 Chen Ridong <chenridong@...wei.com>, Danilo Krummrich <dakr@...nel.org>,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Gabriele Monaco <gmonaco@...hat.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Ingo Molnar <mingo@...hat.com>, Jakub Kicinski <kuba@...nel.org>,
 Jens Axboe <axboe@...nel.dk>, Johannes Weiner <hannes@...xchg.org>,
 Lai Jiangshan <jiangshanlai@...il.com>,
 Marco Crivellari <marco.crivellari@...e.com>, Michal Hocko
 <mhocko@...e.com>, Muchun Song <muchun.song@...ux.dev>,
 Paolo Abeni <pabeni@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
 Phil Auld <pauld@...hat.com>, "Rafael J . Wysocki" <rafael@...nel.org>,
 Roman Gushchin <roman.gushchin@...ux.dev>,
 Shakeel Butt <shakeel.butt@...ux.dev>, Simon Horman <horms@...nel.org>,
 Tejun Heo <tj@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
 Vlastimil Babka <vbabka@...e.cz>, Will Deacon <will@...nel.org>,
 cgroups@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-block@...r.kernel.org, linux-mm@...ck.org, linux-pci@...r.kernel.org,
 netdev@...r.kernel.org
Subject: Re: [PATCH 26/33] kthread: Include kthreadd to the managed affinity
 list

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 <frederic@...nel.org>
> ---
>   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 <longman@...hat.com>