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

[Waiman Long]

On 2/8/24 14:26, Tejun Heo wrote:
> On Thu, Feb 08, 2024 at 11:10:10AM -0500, Waiman Long wrote:
> >   v5:
> >    - [v4] https://lore.kernel.org/lkml/20240207011911.975608-1-longman@xxxxxxxxxx/
> >    - 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@xxxxxxxxxx/
> >    - 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@xxxxxxxxxx/
> >    - 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.

Me too. Thanks for all the good suggestions that you had given me as I 
don't have a full understanding of all the different pieces of the 
workqueue code.

Cheers,
Longman