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Commit 8573d7bf authored by Satya Durga Srinivasu Prabhala's avatar Satya Durga Srinivasu Prabhala
Browse files

sched: Add sched_enq_deq_task trace point 



To debug issues related to task scheduling sched_enq_deq_task
trace point is very useful.

Change-Id: I668702701d5443a4f5b0356634622f071297eb28
Signed-off-by: default avatarSatya Durga Srinivasu Prabhala <satyap@codeaurora.org>
parent 64b577b9

include/trace/events/sched.h

+46 −0
Original line number Diff line number Diff line
@@ -51,6 +51,52 @@ TRACE_EVENT(sched_kthread_stop_ret, 
	TP_printk("ret=%d", __entry->ret)

);



/*

 * Tracepoint for task enqueue/dequeue:

 */

TRACE_EVENT(sched_enq_deq_task,



	TP_PROTO(struct task_struct *p, bool enqueue,

				unsigned int cpus_allowed),



	TP_ARGS(p, enqueue, cpus_allowed),



	TP_STRUCT__entry(

		__array(char,		comm, TASK_COMM_LEN)

		__field(pid_t,		pid)

		__field(int,		prio)

		__field(int,		cpu)

		__field(bool,		enqueue)

		__field(unsigned int,	nr_running)

		__field(unsigned int,	rt_nr_running)

		__field(unsigned int,	cpus_allowed)

		__field(unsigned int,	demand)

		__field(unsigned int,	pred_demand)

	),



	TP_fast_assign(

		memcpy(__entry->comm, p->comm, TASK_COMM_LEN);

		__entry->pid		= p->pid;

		__entry->prio		= p->prio;

		__entry->cpu		= task_cpu(p);

		__entry->enqueue	= enqueue;

		__entry->nr_running	= task_rq(p)->nr_running;

		__entry->rt_nr_running	= task_rq(p)->rt.rt_nr_running;

		__entry->cpus_allowed	= cpus_allowed;

		__entry->demand		= task_load(p);

		__entry->pred_demand	= task_pl(p);

	),



	TP_printk("cpu=%d %s comm=%s pid=%d prio=%d nr_running=%u rt_nr_running=%u affine=%x demand=%u pred_demand=%u",

			__entry->cpu,

			__entry->enqueue ? "enqueue" : "dequeue",

			__entry->comm, __entry->pid,

			__entry->prio, __entry->nr_running,

			__entry->rt_nr_running,

			__entry->cpus_allowed, __entry->demand,

			__entry->pred_demand)

);



/*

 * Tracepoint for waking up a task:

 */

kernel/sched/core.c

+2 −0
Original line number Diff line number Diff line
@@ -1300,6 +1300,7 @@ static inline void enqueue_task(struct rq *rq, struct task_struct *p, int flags) 
	uclamp_rq_inc(rq, p);

	p->sched_class->enqueue_task(rq, p, flags);

	walt_update_last_enqueue(p);

	trace_sched_enq_deq_task(p, 1, cpumask_bits(&p->cpus_mask)[0]);

}



static inline void dequeue_task(struct rq *rq, struct task_struct *p, int flags)
@@ -1318,6 +1319,7 @@ static inline void dequeue_task(struct rq *rq, struct task_struct *p, int flags) 
	if (p == rq->ed_task)

		early_detection_notify(rq, sched_ktime_clock());

#endif

	trace_sched_enq_deq_task(p, 0, cpumask_bits(&p->cpus_mask)[0]);

}



void activate_task(struct rq *rq, struct task_struct *p, int flags)