linux-kernel - Re: [PATCH] tracing: Replace use of system_wq with system_percpu

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Message-ID: <CAAofZF4h65MTAgEuK5+EfE5SocFE3FfGWAcrLv=6fvZrgFtAWQ@mail.gmail.com>
Date: Tue, 30 Dec 2025 11:25:04 +0100
From: Marco Crivellari <marco.crivellari@...e.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, 
	Tejun Heo <tj@...nel.org>, Lai Jiangshan <jiangshanlai@...il.com>, 
	Frederic Weisbecker <frederic@...nel.org>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, 
	Michal Hocko <mhocko@...e.com>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH] tracing: Replace use of system_wq with system_percpu_wq

Hi Steven,

On Wed, Dec 24, 2025 at 9:43 PM Steven Rostedt <rostedt@...dmis.org> wrote:
> [...]
> > @@ -1375,7 +1375,7 @@ static void free_filter_list_tasks(struct rcu_head *rhp)
> >       struct filter_head *filter_list = container_of(rhp, struct filter_head, rcu);
> >
> >       INIT_RCU_WORK(&filter_list->rwork, free_filter_list_work);
> > -     queue_rcu_work(system_wq, &filter_list->rwork);
> > +     queue_rcu_work(system_percpu_wq, &filter_list->rwork);
>
> This is just garbage collection and has no need to be done on the CPU it
> was queued on. I guess this can use system_dfl_wq?

I will check and I will send a new version with the unbound wq.

Thanks!
-- 

Marco Crivellari

L3 Support Engineer