linux-kernel - [PATCH 0/7] Add wq_online_cpumask and remove cpus_read_lock() from apply_wqattrs

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Message-Id: <20240711083547.3981-1-jiangshanlai@gmail.com>
Date: Thu, 11 Jul 2024 16:35:40 +0800
From: Lai Jiangshan <jiangshanlai@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Lai Jiangshan <jiangshan.ljs@...group.com>,
	Tejun Heo <tj@...nel.org>
Subject: [PATCH 0/7] Add wq_online_cpumask and remove cpus_read_lock() from apply_wqattrs_lock()

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

The new wq_online_mask mirrors the cpu_online_mask except during
hotplugging; specifically, it differs between the hotplugging stages
of workqueue_offline_cpu() and workqueue_online_cpu(), during which
the transitioning CPU is not represented in the mask.

With wq_online_cpumask, cpus_read_lock() is unneeded for wqattrs changes.


Lai Jiangshan (7):
  workqueue: Add wq_online_cpumask
  workqueue: Simplify wq_calc_pod_cpumask() with wq_online_cpumask
  workqueue: Remove cpus_read_lock() from apply_wqattrs_lock()
  workqueue: Remove the unneeded cpumask empty check in
    wq_calc_pod_cpumask()
  workqueue: Remove the argument @cpu_going_down from
    wq_calc_pod_cpumask()
  workqueue: Remove the arguments @hotplug_cpu and @online from
    wq_update_pod()
  workqueue: Rename wq_update_pod() to unbound_wq_update_pwq()

Cc: Tejun Heo <tj@...nel.org>

 kernel/workqueue.c | 76 +++++++++++++++++++---------------------------
 1 file changed, 32 insertions(+), 44 deletions(-)

-- 
2.19.1.6.gb485710b