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

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Message-ID: <8d597858-a3e5-42dc-8289-2b74cd362d33@openvpn.net>
Date: Wed, 4 Feb 2026 15:10:39 +0100
From: Antonio Quartulli <antonio@...nvpn.net>
To: Marco Crivellari <marco.crivellari@...e.com>,
 Jakub Kicinski <kuba@...nel.org>
Cc: Tejun Heo <tj@...nel.org>, Lai Jiangshan <jiangshanlai@...il.com>,
 Frederic Weisbecker <frederic@...nel.org>, linux-kernel@...r.kernel.org,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 Michal Hocko <mhocko@...e.com>, Sabrina Dubroca <sd@...asysnail.net>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S . Miller"
 <davem@...emloft.net>, netdev@...r.kernel.org,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH] ovpn: Replace use of system_wq with system_percpu_wq

On 24/12/2025 16:50, Marco Crivellari wrote:
> This patch continues the effort to refactor workqueue APIs, which has begun
> with the changes introducing new workqueues and a new alloc_workqueue flag:
> 
>     commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq")
>     commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag")
> 
> The point of the refactoring is to eventually alter the default behavior of
> workqueues to become unbound by default so that their workload placement is
> optimized by the scheduler.
> 
> Before that to happen after a careful review and conversion of each individual
> case, workqueue users must be converted to the better named new workqueues with
> no intended behaviour changes:
> 
>     system_wq -> system_percpu_wq
>     system_unbound_wq -> system_dfl_wq
> 
> This way the old obsolete workqueues (system_wq, system_unbound_wq) can be
> removed in the future.
> 
> Suggested-by: Tejun Heo <tj@...nel.org>
> Signed-off-by: Marco Crivellari <marco.crivellari@...e.com>

Hello Marco and sorry for the delay.
The patch looks good.

Acked-by: Antonio Quartulli <antonio@...nvpn.net>

Jakub, do you mind picking this up directly in your tree?

Thanks a lot.

Regards,

-- 
Antonio Quartulli
OpenVPN Inc.