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sched: Add sched_enq_deq_task trace point

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

Change-Id: I668702701d5443a4f5b0356634622f071297eb28
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
This commit is contained in:
Satya Durga Srinivasu Prabhala 2018-11-16 17:20:56 -08:00
commit 8573d7bfaa
2 changed files with 48 additions and 0 deletions
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46
include/trace/events/sched.h
View file

@ -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:
*/

2
kernel/sched/core.c
View file

@ -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)