linux-kernel - [GIT PULL] workqueue changes for v6.20

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Message-ID: <6bd5e05f6050405dbdb710ebea86cd5c@kernel.org>
Date: Mon, 09 Feb 2026 09:14:44 -1000
From: Tejun Heo <tj@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Lai Jiangshan <jiangshanlai@...il.com>,
 Breno Leitao <leitao@...ian.org>,
 linux-kernel@...r.kernel.org
Subject: [GIT PULL] workqueue changes for v6.20

Hi Linus,

The following changes since commit c2f2b01b74be8b40a2173372bcd770723f87e7b2:

  Merge tag 'i3c/for-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux (2025-12-08 11:25:14 +0900)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git tags/wq-for-6.20

for you to fetch changes up to 9cb8b0f289560728dbb8b88158e7a957e2e90a14:

  workqueue: replace BUG_ON with panic in panic_on_wq_watchdog (2026-02-07 06:54:42 -1000)

----------------------------------------------------------------
workqueue: Changes for v6.20

- Rework the rescuer to process work items one-by-one instead of
  slurping all pending work items in a single pass. As there is only
  one rescuer per workqueue, a single long-blocking work item could
  cause high latency for all tasks queued behind it, even after memory
  pressure is relieved and regular kworkers become available to service
  them.

- Add CONFIG_BOOTPARAM_WQ_STALL_PANIC build-time option and
  workqueue.panic_on_stall_time parameter for time-based stall panic,
  giving systems more control over workqueue stall handling.

- Replace BUG_ON() with panic() in the stall panic path for clearer
  intent and more informative output.

----------------------------------------------------------------
Breno Leitao (3):
      workqueue: add CONFIG_BOOTPARAM_WQ_STALL_PANIC option
      workqueue: add time-based panic for stalls
      workqueue: replace BUG_ON with panic in panic_on_wq_watchdog

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

 Documentation/admin-guide/kernel-parameters.txt |  11 +-
 kernel/workqueue.c                              | 149 ++++++++++++++++++------
 lib/Kconfig.debug                               |  23 ++++
 3 files changed, 148 insertions(+), 35 deletions(-)

Thanks.

--
tejun