linux-kernel - Re: [PATCH wq/for-6.9 v5 0/4] workqueue: Enable unbound cpumask update on ordered workqueues

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Date: Thu, 8 Feb 2024 09:26:21 -1000
From: Tejun Heo <tj@...nel.org>
To: Waiman Long <longman@...hat.com>
Cc: Lai Jiangshan <jiangshanlai@...il.com>, linux-kernel@...r.kernel.org,
	Juri Lelli <juri.lelli@...hat.com>,
	Cestmir Kalina <ckalina@...hat.com>,
	Alex Gladkov <agladkov@...hat.com>, Phil Auld <pauld@...hat.com>,
	Costa Shulyupin <cshulyup@...hat.com>
Subject: Re: [PATCH wq/for-6.9 v5 0/4] workqueue: Enable unbound cpumask
 update on ordered workqueues

On Thu, Feb 08, 2024 at 11:10:10AM -0500, Waiman Long wrote:
>  v5:
>   - [v4] https://lore.kernel.org/lkml/20240207011911.975608-1-longman@redhat.com/
>   - Streamline patch 2 by simplifying unplug_oldest_pwq() and calling it
>     only in pwq_release_workfn().
> 
>  v4:
>   - [v3] https://lore.kernel.org/lkml/20240205194602.871505-1-longman@redhat.com/
>   - Rebase on the latest for-6.9 branch again & discard the use of
>     __WQ_ORDERED_EXPLICIT and resetting of __WQ_ORDERED.
>   - Add a new patch 1 to change the ordering of pwq's in wq->pwqs from
>     oldest to newest.
>   - Change the terminalogy from freeze/thaw to plug/unplug.
>   - Allow more than 2 pwq's in wq->pwqs of ordered workqueue but only the
>     oldest one is unplugged. This eliminates the need to wait for
>     the draining of extra pwq in workqueue_apply_unbound_cpumask().
> 
>  v3:
>   - [v2] https://lore.kernel.org/lkml/20240203154334.791910-1-longman@redhat.com/
>   - Drop patch 1 as it has been merged into the for-6.9 branch.
>   - Use rcu_access_pointer() to access wq->dfl_pwq.
>   - Use RCU protection instead of acquiring wq->mutex in
>     apply_wqattrs_cleanup().

Applied the series w/ (w/ the updated second patch) to wq/for-6.9.

Thanks for working on this. It's really great that this got solved finally.

-- 
tejun