linux-kernel - [PATCH 4/5] sched: Add rt task enqueue/dequeue trace points

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Message-Id: <8f83869a5040bd7cd3096bd12090c1ab110ae5c4.1753879295.git.namcao@linutronix.de>
Date: Wed, 30 Jul 2025 14:45:42 +0200
From: Nam Cao <namcao@...utronix.de>
To: Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Gabriele Monaco <gmonaco@...hat.com>,
	linux-trace-kernel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Nam Cao <namcao@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Ben Segall <bsegall@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>
Subject: [PATCH 4/5] sched: Add rt task enqueue/dequeue trace points

Add trace points into enqueue_task_rt() and dequeue_task_rt(). They are
useful to implement RV monitor which validates RT scheduling.

Signed-off-by: Nam Cao <namcao@...utronix.de>
---
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Juri Lelli <juri.lelli@...hat.com>
Cc: Vincent Guittot <vincent.guittot@...aro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>
Cc: Ben Segall <bsegall@...gle.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Valentin Schneider <vschneid@...hat.com>
---
 include/trace/events/sched.h | 8 ++++++++
 kernel/sched/rt.c            | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index c08893bde255..c38f12f7f903 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -898,6 +898,14 @@ DECLARE_TRACE(sched_set_need_resched,
 	TP_PROTO(struct task_struct *tsk, int cpu, int tif),
 	TP_ARGS(tsk, cpu, tif));
 
+DECLARE_TRACE(enqueue_task_rt,
+	TP_PROTO(int cpu, struct task_struct *task),
+	TP_ARGS(cpu, task));
+
+DECLARE_TRACE(dequeue_task_rt,
+	TP_PROTO(int cpu, struct task_struct *task),
+	TP_ARGS(cpu, task));
+
 #endif /* _TRACE_SCHED_H */
 
 /* This part must be outside protection */
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index e40422c37033..f4d3f5e7fbec 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1480,6 +1480,8 @@ enqueue_task_rt(struct rq *rq, struct task_struct *p, int flags)
 {
 	struct sched_rt_entity *rt_se = &p->rt;
 
+	trace_enqueue_task_rt_tp(rq->cpu, p);
+
 	if (flags & ENQUEUE_WAKEUP)
 		rt_se->timeout = 0;
 
@@ -1501,6 +1503,8 @@ static bool dequeue_task_rt(struct rq *rq, struct task_struct *p, int flags)
 
 	dequeue_pushable_task(rq, p);
 
+	trace_dequeue_task_rt_tp(rq->cpu, p);
+
 	return true;
 }
 
-- 
2.39.5