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workqueue: Only assign rescuer work when really needed

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If the pwq does not need rescue (normal workers have been created or
become available), the rescuer can immediately move on to other stalled
pwqs.

Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Lai Jiangshan 2025-11-21 22:57:15 +08:00 • committed by Tejun Heo
parent 99ed6f62a4
commit 7b05c90b33
1 changed files with 4 additions and 0 deletions
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4
kernel/workqueue.c
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@ -3442,6 +3442,10 @@ static bool assign_rescuer_work(struct pool_workqueue *pwq, struct worker *rescu
struct worker_pool *pool = pwq->pool;
struct work_struct *work, *n;
/* need rescue? */
if (!pwq->nr_active || !need_to_create_worker(pool))
return false;
/*
* Slurp in all works issued via this workqueue and
* process'em.