sched: Increase sched_tick_remote timeout

auldp · auldp · commit 89920be97812 · 2025-11-24T14:20:34.000Z
JIRA: https://issues.redhat.com/browse/RHEL-102425 Upstream Status: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core commit aaab6bb Author: Phil Auld <pauld@redhat.com> Date: Thu Sep 11 12:13:00 2025 -0400 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@kernel.org> Signed-off-by: Phil Auld <pauld@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Frederic Weisbecker <frederic@kernel.org> Link: https://patch.msgid.link/20250911161300.437944-1-pauld@redhat.com Signed-off-by: Phil Auld <pauld@redhat.com>
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
@@ -5596,7 +5596,7 @@ 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);
 

Original file line number	Diff line number	Diff line change
`@@ -5596,7 +5596,7 @@ static void sched_tick_remote(struct work_struct *work)`
`5596`	`5596`	`* reasonable amount of time.`
`5597`	`5597`	`*/`
`5598`	`5598`	`u64 delta = rq_clock_task(rq) - curr->se.exec_start;`
`5599`		`- WARN_ON_ONCE(delta > (u64)NSEC_PER_SEC * 3);`
	`5599`	`+ WARN_ON_ONCE(delta > (u64)NSEC_PER_SEC * 30);`
`5600`	`5600`	`}`
`5601`	`5601`	`curr->sched_class->task_tick(rq, curr, 0);`
`5602`	`5602`