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workqueue: Disable per-cpu CPU hog detection when wq_cpu_intensive_thresh_us is 0 

If workqueue.cpu_intensive_thresh_us is set to 0, the detection mechanism
for CPU-hogging per-cpu work item will keep triggering spuriously:

  workqueue: process_srcu hogged CPU for >0us 4 times, consider switching to WQ_UNBOUND
  workqueue: gc_worker hogged CPU for >0us 4 times, consider switching to WQ_UNBOUND
  workqueue: gc_worker hogged CPU for >0us 8 times, consider switching to WQ_UNBOUND
  workqueue: wait_rcu_exp_gp hogged CPU for >0us 4 times, consider switching to WQ_UNBOUND
  workqueue: kfree_rcu_monitor hogged CPU for >0us 4 times, consider switching to WQ_UNBOUND
  workqueue: kfree_rcu_monitor hogged CPU for >0us 8 times, consider switching to WQ_UNBOUND
  workqueue: reg_todo hogged CPU for >0us 4 times, consider switching to WQ_UNBOUND

This commit therefore disables the CPU-hog detection mechanism when
workqueue.cpu_intensive_thresh_us is set to 0.

tj: Patch description updated and the condition check on
    cpu_intensive_thresh_us separated into a separate if statement for
    readability.

Signed-off-by: Zqiang <qiang.zhang1211@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Zqiang 2023-05-25 12:00:38 +08:00 committed by Tejun Heo
parent c8f6219be2
commit 18c8ae8131
1 changed files with 3 additions and 0 deletions
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3
kernel/workqueue.c
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@ -1139,6 +1139,9 @@ void wq_worker_tick(struct task_struct *task)
pwq->stats[PWQ_STAT_CPU_TIME] += TICK_USEC;
if (!wq_cpu_intensive_thresh_us)
return;
/*
* If the current worker is concurrency managed and hogged the CPU for
* longer than wq_cpu_intensive_thresh_us, it's automatically marked