[PATCH V4 0/4] workqueue: Factor the way to assign rescuer work

[Lai Jiangshan <jiangshanlai@gmail.com>]

From: Lai Jiangshan <jiangshan.ljs@antgroup.com>

Previously, the rescuer scanned for all matching work items at once and
processed them within a single rescuer thread, which could cause one
blocking work item to stall all others.

Make the rescuer process work items one-by-one instead of slurping all
matches in a single pass using a cursor.

Changed from V3:
  check memory pressure
  update comments
  rename @limited to @throttled

v3: https://lore.kernel.org/lkml/20251121145720.342467-1-jiangshanlai@gmail.com/

Lai Jiangshan (4):
  workqueue: Loop over in rescuer until all its work is done
  workqueue: Process rescuer work items one-by-one using a cursor
  workqueue: Limit number of processed works in rescuer per turn
  workqueue: Process extra works in rescuer when there are no more to
    rescue

 kernel/workqueue.c | 141 ++++++++++++++++++++++++++++++++++-----------
 1 file changed, 108 insertions(+), 33 deletions(-)

-- 
2.19.1.6.gb485710b