diff options
| author | Arun Bharadwaj <abharadw@codeaurora.org> | 2013-06-19 16:55:29 -0700 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-23 19:58:34 -0700 |
| commit | 9f6eb26ae8f49eba60d5aaf10affdc28fd42608c (patch) | |
| tree | bb83d53a3750a9ee50b940410e7f26d85604194b | |
| parent | 0ec4cf2484ad5860d84dda1aef44dc35e7c2a81d (diff) | |
tracing/sched: Track per-cpu rt and non-rt cpu_load.
Add a new tracepoint trace_sched_enq_deq_task to track
per-cpu rt and non-rt cpu_load during task enqueue
and dequeue.
This is useful to visualize and compare the load on
different cpus and also to understand how balanced
the load is at any point of time.
Note: We only print cpu_load[0] because we only care about
the most recent load history for tracking load balancer
effectiveness.
Change-Id: I46f0bb84e81652099ed5edf8c2686c70c8b8330c
Signed-off-by: Arun Bharadwaj <abharadw@codeaurora.org>
| -rw-r--r-- | include/trace/events/sched.h | 38 | ||||
| -rw-r--r-- | kernel/sched/core.c | 2 |
2 files changed, 40 insertions, 0 deletions
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index d34eba74af27..f6ce9e64c46c 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -51,6 +51,44 @@ TRACE_EVENT(sched_kthread_stop_ret, ); /* + * Tracepoint for task enqueue/dequeue: + */ +TRACE_EVENT(sched_enq_deq_task, + + TP_PROTO(struct task_struct *p, int enqueue), + + TP_ARGS(p, enqueue), + + TP_STRUCT__entry( + __array( char, comm, TASK_COMM_LEN ) + __field( pid_t, pid ) + __field( int, prio ) + __field( int, cpu ) + __field( int, enqueue ) + __field(unsigned int, nr_running ) + __field(unsigned long, cpu_load ) + __field(unsigned int, rt_nr_running ) + ), + + 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->cpu_load = task_rq(p)->cpu_load[0]; + __entry->rt_nr_running = task_rq(p)->rt.rt_nr_running; + ), + + TP_printk("cpu=%d %s comm=%s pid=%d prio=%d nr_running=%u cpu_load=%lu rt_nr_running=%u", + __entry->cpu, __entry->enqueue ? "enqueue" : "dequeue", + __entry->comm, __entry->pid, + __entry->prio, __entry->nr_running, + __entry->cpu_load, __entry->rt_nr_running) +); + +/* * Tracepoint for waking up a task: */ DECLARE_EVENT_CLASS(sched_wakeup_template, diff --git a/kernel/sched/core.c b/kernel/sched/core.c index daababd6b211..3d06045706c6 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -852,6 +852,7 @@ static inline void enqueue_task(struct rq *rq, struct task_struct *p, int flags) if (!(flags & ENQUEUE_RESTORE)) sched_info_queued(rq, p); p->sched_class->enqueue_task(rq, p, flags); + trace_sched_enq_deq_task(p, 1); } static inline void dequeue_task(struct rq *rq, struct task_struct *p, int flags) @@ -860,6 +861,7 @@ static inline void dequeue_task(struct rq *rq, struct task_struct *p, int flags) if (!(flags & DEQUEUE_SAVE)) sched_info_dequeued(rq, p); p->sched_class->dequeue_task(rq, p, flags); + trace_sched_enq_deq_task(p, 0); } void activate_task(struct rq *rq, struct task_struct *p, int flags) |