From: Marco Crivellari <marco.crivellari@suse.com>
To: linux-kernel@vger.kernel.org
Cc: Tejun Heo <tj@kernel.org>, Lai Jiangshan <jiangshanlai@gmail.com>,
Frederic Weisbecker <frederic@kernel.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Marco Crivellari <marco.crivellari@suse.com>,
Michal Hocko <mhocko@suse.com>, Jens Axboe <axboe@kernel.dk>,
Josef Bacik <josef@toxicpanda.com>,
cgroups@vger.kernel.org
Subject: [PATCH v2 2/2] block/blk-throttle: Add WQ_PERCPU to alloc_workqueue users
Date: Mon, 23 Feb 2026 10:29:20 +0100 [thread overview]
Message-ID: <20260223092920.60424-3-marco.crivellari@suse.com> (raw)
In-Reply-To: <20260223092920.60424-1-marco.crivellari@suse.com>
This continues the effort to refactor workqueue APIs, which began with
the introduction of new workqueues and a new alloc_workqueue flag in:
commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq")
commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag")
The refactoring is going to alter the default behavior of
alloc_workqueue() to be unbound by default.
With the introduction of the WQ_PERCPU flag (equivalent to !WQ_UNBOUND),
any alloc_workqueue() caller that doesn’t explicitly specify WQ_UNBOUND
must now use WQ_PERCPU. For more details see the Link tag below.
In order to keep alloc_workqueue() behavior identical, explicitly request
WQ_PERCPU.
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: cgroups@vger.kernel.org
Link: https://lore.kernel.org/all/20250221112003.1dSuoGyc@linutronix.de/
Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@suse.com>
---
block/blk-throttle.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 97188a795848..cabf91f0d0dc 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1839,7 +1839,7 @@ void blk_throtl_exit(struct gendisk *disk)
static int __init throtl_init(void)
{
- kthrotld_workqueue = alloc_workqueue("kthrotld", WQ_MEM_RECLAIM, 0);
+ kthrotld_workqueue = alloc_workqueue("kthrotld", WQ_MEM_RECLAIM | WQ_PERCPU, 0);
if (!kthrotld_workqueue)
panic("Failed to create kthrotld\n");
--
2.52.0
next prev parent reply other threads:[~2026-02-23 9:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-23 9:29 [PATCH v2 0/2] Add WQ_PERCPU to alloc_workqueue users Marco Crivellari
2026-02-23 9:29 ` [PATCH v2 1/2] block: " Marco Crivellari
2026-02-23 9:29 ` Marco Crivellari [this message]
2026-03-18 15:31 ` [PATCH v2 0/2] " Marco Crivellari
2026-03-27 16:06 ` Marco Crivellari
2026-04-09 9:49 ` Marco Crivellari
2026-04-17 20:39 ` Jens Axboe
2026-04-20 7:57 ` Marco Crivellari
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