workqueue: Init rescuer's affinities as wq_unbound_cpumask

Browse source

The affinity to set to the rescuers should be consistent in all paths
when a rescuer is in detached state. The affinity could be either
wq_unbound_cpumask or unbound_effective_cpumask(wq).

Related paths:
       rescuer's worker_detach_from_pool()
       update wq_unbound_cpumask
       update wq's cpumask
       init_rescuer()

Both affinities are Ok as long as they are consistent in all paths.

In the commit 449b31ad29 ("workqueue: Init rescuer's affinities as
the wq's effective cpumask") makes init_rescuer use
unbound_effective_cpumask(wq) which is consistent with then
apply_wqattrs_commit().

But using unbound_effective_cpumask(wq) requres much more code to
maintain the consistency, and it doesn't make much sense since the
affinity is only effective when the rescuer is not processing works.
wq_unbound_cpumask is more favorable.

So apply_wqattrs_commit() and the path of "updating wq's cpumask" had
been changed to not update the rescuer's affinity, and both the paths
of "updating wq_unbound_cpumask" and "rescuer's
worker_detach_from_pool()" had been changed to use wq_unbound_cpumask.

Now, make init_rescuer() use wq_unbound_cpumask for rescuer's affinity
and make all the paths consistent.

Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Waiman Long <longman@redhat.com>
Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

...

This commit is contained in:

Lai Jiangshan 2025-11-17 11:09:13 +08:00 • committed by Tejun Heo

parent 8ac4dbe7dd

commit c9c19e8bbc

1 changed files with 5 additions and 2 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

7

kernel/workqueue.c

View file