This is a note to let you know that I've just added the patch titled
Revert "workqueue: Make wq_adjust_max_active() round-robin pwqs while activating"
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
revert-workqueue-make-wq_adjust_max_active-round-robin-pwqs-while-activating.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c1160908b097134695a131c2d974c6d801058eff Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 3 Apr 2024 16:29:19 +0200
Subject: Revert "workqueue: Make wq_adjust_max_active() round-robin pwqs while activating"
From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
This reverts commit ddb232dc0f1339f9ed506730fd6bee6f5e3dcb37 which is
commit c5404d4e6df6faba1007544b5f4e62c7c14416dd upstream.
The workqueue patches backported to 6.8.y caused some reported
regressions, so revert them for now.
Reported-by: Thorsten Leemhuis <regressions@xxxxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Sasha Levin <sashal@xxxxxxxxxx>
Cc: Audra Mitchell <audra@xxxxxxxxxx>
Link: https://lore.kernel.org/all/ce4c2f67-c298-48a0-87a3-f933d646c73b@xxxxxxxxxxxxx/
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/workqueue.c | 33 +++++++++++++--------------------
1 file changed, 13 insertions(+), 20 deletions(-)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4703,7 +4703,7 @@ static int init_rescuer(struct workqueue
*/
static void wq_adjust_max_active(struct workqueue_struct *wq)
{
- bool activated;
+ struct pool_workqueue *pwq;
lockdep_assert_held(&wq->mutex);
@@ -4723,26 +4723,19 @@ static void wq_adjust_max_active(struct
*/
WRITE_ONCE(wq->max_active, wq->saved_max_active);
- /*
- * Round-robin through pwq's activating the first inactive work item
- * until max_active is filled.
- */
- do {
- struct pool_workqueue *pwq;
+ for_each_pwq(pwq, wq) {
+ unsigned long flags;
+
+ /* this function can be called during early boot w/ irq disabled */
+ raw_spin_lock_irqsave(&pwq->pool->lock, flags);
- activated = false;
- for_each_pwq(pwq, wq) {
- unsigned long flags;
-
- /* can be called during early boot w/ irq disabled */
- raw_spin_lock_irqsave(&pwq->pool->lock, flags);
- if (pwq_activate_first_inactive(pwq)) {
- activated = true;
- kick_pool(pwq->pool);
- }
- raw_spin_unlock_irqrestore(&pwq->pool->lock, flags);
- }
- } while (activated);
+ while (pwq_activate_first_inactive(pwq))
+ ;
+
+ kick_pool(pwq->pool);
+
+ raw_spin_unlock_irqrestore(&pwq->pool->lock, flags);
+ }
}
__printf(1, 4)
Patches currently in stable-queue which might be from gregkh@xxxxxxxxxxxxxxxxxxx are
queue-6.8/revert-workqueue-move-pwq-max_active-to-wq-max_active.patch
queue-6.8/revert-workqueue-replace-pwq_activate_inactive_work-with-pwq_activate_work.patch
queue-6.8/revert-workqueue-implement-system-wide-nr_active-enforcement-for-unbound-workqueues.patch
queue-6.8/revert-workqueue-introduce-struct-wq_node_nr_active.patch
queue-6.8/revert-workqueue-rcu-protect-wq-dfl_pwq-and-implement-accessors-for-it.patch
queue-6.8/revert-workqueue-don-t-call-cpumask_test_cpu-with-1-cpu-in-wq_update_node_max_active.patch
queue-6.8/revert-workqueue-factor-out-pwq_is_empty.patch
queue-6.8/revert-workqueue-shorten-events_freezable_power_efficient-name.patch
queue-6.8/revert-workqueue-make-wq_adjust_max_active-round-robin-pwqs-while-activating.patch
queue-6.8/revert-workqueue.c-increase-workqueue-name-length.patch
queue-6.8/revert-workqueue-move-nr_active-handling-into-helpers.patch
