linux-kernel - [RFC PATCH 0/3] workqueue: Enable unbound cpumask update on ordered workqueues

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Date: Tue, 30 Jan 2024 13:33:33 -0500
From: Waiman Long <longman@...hat.com>
To: Tejun Heo <tj@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.com>
Cc: linux-kernel@...r.kernel.org,
	Juri Lelli <juri.lelli@...hat.com>,
	Cestmir Kalina <ckalina@...hat.com>,
	Alex Gladkov <agladkov@...hat.com>,
	Waiman Long <longman@...hat.com>
Subject: [RFC PATCH 0/3] workqueue: Enable unbound cpumask update on ordered workqueues

Ordered workqueues does not currently follow changes made to the
global unbound cpumask because per-pool workqueue changes may break
the ordering guarantee. IOW, a work function in an ordered workqueue
may run on a cpuset isolated CPU.

This series enables ordered workqueues to follow changes made to the
global unbound cpumask by temporaily saving the work items in an
internal queue until the old pwq has been properly flushed and to be
freed. At that point, those work items, if present, are queued back to
the new pwq to be executed.

Waiman Long (3):
  workqueue: Skip __WQ_DESTROYING workqueues when updating global
    unbound cpumask
  workqueue: Break out __queue_work_rcu_locked() from __queue_work()
  workqueue: Enable unbound cpumask update on ordered workqueues

 kernel/workqueue.c | 217 ++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 183 insertions(+), 34 deletions(-)

-- 
2.39.3