evie/android_kernel_oneplus_msm8998
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

tracing/sched: Track per-cpu rt and non-rt cpu_load.

Browse source 
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>
This commit is contained in:
Arun Bharadwaj 2013-06-19 16:55:29 -07:00 • committed by David Keitel
parent 0ec4cf2484
commit 9f6eb26ae8
2 changed files with 40 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

38
include/trace/events/sched.h
View file

@ -50,6 +50,44 @@ 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, 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:
*/

2
kernel/sched/core.c
View file

@ -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)