linux-kernel - Re: [PATCH AUTOSEL 4.19 12/14] workqueue: Call wq_update_unbound_numa() on all CPUs in NUMA node on CPU hotplug

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Message-ID: <ZP7kmzEAizx8MU/Z@duo.ucw.cz>
Date:   Mon, 11 Sep 2023 11:57:47 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH AUTOSEL 4.19 12/14] workqueue: Call
 wq_update_unbound_numa() on all CPUs in NUMA node on CPU hotplug

Hi!

> When a CPU went online or offline, wq_update_unbound_numa() was called only
> on the CPU which was going up or down. This works fine because all CPUs on
> the same NUMA node share the same pool_workqueue slot - one CPU updating it
> updates it for everyone in the node.
> 
> However, future changes will make each CPU use a separate pool_workqueue
> even when they're sharing the same worker_pool, which requires updating
> pool_workqueue's for all CPUs which may be sharing the same pool_workqueue
> on hotplug.

Yes, but we are not porting those future changes to stable, right?
Please drop.

BR,
									Pavel
-- 
DENX Software Engineering GmbH,        Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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