linux-kernel - [tip: locking/core] test-ww_mutex: Move work to its own UNBOUND workqueue

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Message-ID: <176605150629.510.15684688440979181256.tip-bot2@tip-bot2>
Date: Thu, 18 Dec 2025 09:51:46 -0000
From: "tip-bot2 for John Stultz" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: John Stultz <jstultz@...gle.com>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject:
 [tip: locking/core] test-ww_mutex: Move work to its own UNBOUND workqueue

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     d327e7166efa24c69719890ea332b55a9dea21a7
Gitweb:        https://git.kernel.org/tip/d327e7166efa24c69719890ea332b55a9dea21a7
Author:        John Stultz <jstultz@...gle.com>
AuthorDate:    Fri, 05 Dec 2025 01:35:10 
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Thu, 18 Dec 2025 10:45:23 +01:00

test-ww_mutex: Move work to its own UNBOUND workqueue

The test-ww_mutex test already allocates its own workqueue
so be sure to use it for the mtx.work and abba.work rather
then the default system workqueue.

This resolves numerous messages of the sort:
"workqueue: test_abba_work hogged CPU... consider switching to WQ_UNBOUND"
"workqueue: test_mutex_work hogged CPU... consider switching to WQ_UNBOUND"

Signed-off-by: John Stultz <jstultz@...gle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://patch.msgid.link/20251205013515.759030-3-jstultz@google.com
---
 kernel/locking/test-ww_mutex.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/locking/test-ww_mutex.c b/kernel/locking/test-ww_mutex.c
index d27aaaa..30512b3 100644
--- a/kernel/locking/test-ww_mutex.c
+++ b/kernel/locking/test-ww_mutex.c
@@ -72,7 +72,7 @@ static int __test_mutex(struct ww_class *class, unsigned int flags)
 	init_completion(&mtx.done);
 	mtx.flags = flags;
 
-	schedule_work(&mtx.work);
+	queue_work(wq, &mtx.work);
 
 	wait_for_completion(&mtx.ready);
 	ww_mutex_lock(&mtx.mutex, (flags & TEST_MTX_CTX) ? &ctx : NULL);
@@ -234,7 +234,7 @@ static int test_abba(struct ww_class *class, bool trylock, bool resolve)
 	abba.trylock = trylock;
 	abba.resolve = resolve;
 
-	schedule_work(&abba.work);
+	queue_work(wq, &abba.work);
 
 	ww_acquire_init_noinject(&ctx, class);
 	if (!trylock)