linux-kernel - [RESEND][PATCH 2/2] test-ww_mutex: Move work to its own UNBOUND workqueue

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Message-ID: <20250715021417.4015799-2-jstultz@google.com>
Date: Tue, 15 Jul 2025 02:14:05 +0000
From: John Stultz <jstultz@...gle.com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: John Stultz <jstultz@...gle.com>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>, 
	Boqun Feng <boqun.feng@...il.com>, "Paul E . McKenney" <paulmck@...nel.org>, 
	Joel Fernandes <joelagnelf@...dia.com>, Dietmar Eggemann <dietmar.eggemann@....com>, 
	Suleiman Souhlal <suleiman@...gle.com>, kernel-team@...roid.com
Subject: [RESEND][PATCH 2/2] 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>
---
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Will Deacon <will@...nel.org>
Cc: Waiman Long <longman@...hat.com>
Cc: Boqun Feng <boqun.feng@...il.com>
Cc: "Paul E . McKenney" <paulmck@...nel.org>
Cc: Joel Fernandes <joelagnelf@...dia.com>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>
Cc: Suleiman Souhlal <suleiman@...gle.com>
Cc: kernel-team@...roid.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 dcfa5ab15ab49..a05d24deab529 100644
--- a/kernel/locking/test-ww_mutex.c
+++ b/kernel/locking/test-ww_mutex.c
@@ -71,7 +71,7 @@ static int __test_mutex(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);
@@ -231,7 +231,7 @@ static int test_abba(bool trylock, bool resolve)
 	abba.trylock = trylock;
 	abba.resolve = resolve;
 
-	schedule_work(&abba.work);
+	queue_work(wq, &abba.work);
 
 	ww_acquire_init_noinject(&ctx, &ww_class);
 	if (!trylock)
-- 
2.50.0.727.gbf7dc18ff4-goog