Re: [RFC PATCH 6/6] affs: Move long delayed work on system_dfl_long_wq

[David Sterba <dsterba@suse.cz>]

On Fri, May 08, 2026 at 03:45:34PM +0200, Marco Crivellari wrote:
> Currently the code enqueue work items using {queue|mod}_delayed_work(),
> using system_long_wq. This workqueue should be used when long works are
> expected and it is a per-cpu workqueue.
> 
> The function(s) end up calling __queue_delayed_work(), which set a global
> timer that could fire anywhere, enqueuing the work where the timer fired.
> 
> Unbound works could benefit from scheduler task placement, to optimize
> performance and power consumption. Long work shouldn't stick to a single
> CPU.
> 
> Recently, a new unbound workqueue specific for long running work has
> been added:
> 
>     c116737e972e ("workqueue: Add system_dfl_long_wq for long unbound works")
> 
> Since the workqueue work doesn't rely on per-cpu variables, there is no
> obvious reason that justify the use of a per-cpu workqueue. So change
> system_long_wq with system_dfl_long_wq so that the work may benefit from
> scheduler task placement.
> 
> Cc: David Sterba <dsterba@suse.com>
> Cc: linux-fsdevel@vger.kernel.org
> Signed-off-by: Marco Crivellari <marco.crivellari@suse.com>

Acked-by: David Sterba <dsterba@suse.com>