linux-kernel - [PATCH] sched: Increase sched_tick

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Message-ID: <20250911161300.437944-1-pauld@redhat.com>
Date: Thu, 11 Sep 2025 12:13:00 -0400
From: Phil Auld <pauld@...hat.com>
To: frederic@...nel.org
Cc: bsegall@...gle.com,
	dietmar.eggemann@....com,
	juri.lelli@...hat.com,
	linux-kernel@...r.kernel.org,
	mgorman@...e.de,
	mingo@...hat.com,
	pauld@...hat.com,
	peterz@...radead.org,
	rostedt@...dmis.org,
	tanghui20@...wei.com,
	tglx@...utronix.de,
	vincent.guittot@...aro.org,
	wangtao554@...wei.com,
	zhangqiao22@...wei.com,
	Waiman Long <longman@...hat.com>
Subject: [PATCH] sched: Increase sched_tick_remote timeout

Increase the sched_tick_remote WARN_ON timeout to remove false
positives due to temporarily busy HK cpus. The suggestion
was 30 seconds to catch really stuck remote tick processing
but not trigger it too easily.

Signed-off-by: Phil Auld <pauld@...hat.com>
Suggested-by: Frederic Weisbecker <frederic@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Frederic Weisbecker <frederic@...nel.org>
---
 kernel/sched/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index be00629f0ba4..ef90d358252d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5724,7 +5724,7 @@ static void sched_tick_remote(struct work_struct *work)
 				 * reasonable amount of time.
 				 */
 				u64 delta = rq_clock_task(rq) - curr->se.exec_start;
-				WARN_ON_ONCE(delta > (u64)NSEC_PER_SEC * 3);
+				WARN_ON_ONCE(delta > (u64)NSEC_PER_SEC * 30);
 			}
 			curr->sched_class->task_tick(rq, curr, 0);
 
-- 
2.51.0