Re: [PATCH 1/3] drm/i915: replace use of system_unbound_wq with system_dfl_wq
From: Krzysztof Karas
Date: Mon Nov 03 2025 - 05:19:49 EST
Hi Marco,
> Currently if a user enqueue a work item using schedule_delayed_work() the
> used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use
> WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to
> schedule_work() that is using system_wq and queue_work(), that makes use
> again of WORK_CPU_UNBOUND.
>
> This lack of consistency cannot be addressed without refactoring the API.
>
> system_unbound_wq should be the default workqueue so as not to enforce
> locality constraints for random work whenever it's not required.
This commit message is very similar to your previous change:
128ea9f6ccfb6960293ae4212f4f97165e42222d - did you do that
intentionally or is this a copy-paste mistake? This is also
prevalent in other two patches, so I am curious.
>
> Adding system_dfl_wq to encourage its use when unbound work should be used.
Please remove this sentence, because this has already been done.
>
> The old system_unbound_wq will be kept for a few release cycles.
>
> Suggested-by: Tejun Heo <tj@xxxxxxxxxx>
> Signed-off-by: Marco Crivellari <marco.crivellari@xxxxxxxx>
> ---
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Best Regards,
Krzysztof