[PATCH 4/5] sched: Add rt task enqueue/dequeue trace points
From: Nam Cao <hidden>
Date: 2025-07-30 12:45:50
Also in:
lkml
Subsystem:
scheduler, the rest, tracing · Maintainers:
Ingo Molnar, Peter Zijlstra, Juri Lelli, Vincent Guittot, Linus Torvalds, Steven Rostedt, Masami Hiramatsu
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 <redacted> --- Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Vincent Guittot <vincent.guittot@linaro.org> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: Ben Segall <bsegall@google.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Valentin Schneider <vschneid@redhat.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