diff mbox series

[27/30] sched: latency warn for TIF_NEED_RESCHED_LAZY

Message ID 20240213055554.1802415-28-ankur.a.arora@oracle.com
State New
Headers
Series PREEMPT_AUTO: support lazy rescheduling |

Commit Message

Ankur Arora Feb. 13, 2024, 5:55 a.m. UTC 
  resched_latency_warn() now also warns if TIF_NEED_RESCHED_LAZY
is set without rescheduling for more than the latency_warn_ms period.

Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Ziljstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
---
 kernel/sched/core.c  | 2 +-
 kernel/sched/debug.c | 7 +++++--
 2 files changed, 6 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index aa31f23f43f4..cce84ba0417f 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5670,7 +5670,7 @@  static u64 cpu_resched_latency(struct rq *rq)
 	if (sysctl_resched_latency_warn_once && warned_once)
 		return 0;
 
-	if (!need_resched() || !latency_warn_ms)
+	if ((!need_resched() && !need_resched_lazy()) || !latency_warn_ms)
 		return 0;
 
 	if (system_state == SYSTEM_BOOTING)
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index e53f1b73bf4a..869a09781f2e 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -1114,9 +1114,12 @@  void proc_sched_set_task(struct task_struct *p)
 void resched_latency_warn(int cpu, u64 latency)
 {
 	static DEFINE_RATELIMIT_STATE(latency_check_ratelimit, 60 * 60 * HZ, 1);
+	char *nr;
+
+	nr = tif_need_resched(NR_now) ? "need_resched" : "need_resched_lazy";
 
 	WARN(__ratelimit(&latency_check_ratelimit),
-	     "sched: CPU %d need_resched set for > %llu ns (%d ticks) "
+	     "sched: CPU %d %s set for > %llu ns (%d ticks) "
 	     "without schedule\n",
-	     cpu, latency, cpu_rq(cpu)->ticks_without_resched);
+	     cpu, nr, latency, cpu_rq(cpu)->ticks_without_resched);
 }