[PATCH V5 0/3] 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 V4:

  Control the limit and call send_mayday() in rescuer_thread(), which
  makes rescuer_thread() responsible for ensuring the cursor is not left
  behind.

v4: https://lore.kernel.org/lkml/20251125063617.671199-1-jiangshanlai@gmail.com/

Lai Jiangshan (3):
  workqueue: Refactor send_mayday() to take pwq directly
  workqueue: Process rescuer work items one-by-one using a cursor
  workqueue: Process extra works in rescuer on memory pressure

 kernel/workqueue.c | 119 ++++++++++++++++++++++++++++++++++-----------
 1 file changed, 91 insertions(+), 28 deletions(-)

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2.19.1.6.gb485710b