linux-kernel - [tip: sched/core] sched: Increase sched_tick

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Message-ID: <176339661733.498.9804936328865542931.tip-bot2@tip-bot2>
Date: Mon, 17 Nov 2025 16:23:37 -0000
From: "tip-bot2 for Phil Auld" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Frederic Weisbecker <frederic@...nel.org>, Phil Auld <pauld@...hat.com>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched: Increase sched_tick_remote timeout

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

Commit-ID:     aaab6bb54ab9bc4c37ff33b816031918d2760517
Gitweb:        https://git.kernel.org/tip/aaab6bb54ab9bc4c37ff33b816031918d2760517
Author:        Phil Auld <pauld@...hat.com>
AuthorDate:    Thu, 11 Sep 2025 12:13:00 -04:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 17 Nov 2025 17:13:15 +01:00

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.

Suggested-by: Frederic Weisbecker <frederic@...nel.org>
Signed-off-by: Phil Auld <pauld@...hat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Frederic Weisbecker <frederic@...nel.org>
Link: https://patch.msgid.link/20250911161300.437944-1-pauld@redhat.com
---
 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 68f19aa..699db3f 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5619,7 +5619,7 @@ 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);