sched/tracing: Add a new tracepoint for sleeptime
If CONFIG_SCHEDSTATS is defined, the kernel maintains information about how long the task was sleeping or in the case of iowait, blocking in the kernel before getting woken up. This will be useful for sleep time profiling. Note: this information is only provided for sched_fair. Other scheduling classes may choose to provide this in the future. Note: the delay includes the time spent on the runqueue as well. Signed-off-by: Arun Sharma <asharma@fb.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Arnaldo Carvalho de Melo <acme@infradead.org> Cc: Andrew Vagin <avagin@openvz.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/1324512940-32060-2-git-send-email-asharma@fb.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
parent
664dfa65e8
commit
1ac9bc6943
|
@ -370,6 +370,56 @@ TRACE_EVENT(sched_stat_runtime,
|
|||
(unsigned long long)__entry->vruntime)
|
||||
);
|
||||
|
||||
#ifdef CREATE_TRACE_POINTS
|
||||
static inline u64 trace_get_sleeptime(struct task_struct *tsk)
|
||||
{
|
||||
#ifdef CONFIG_SCHEDSTATS
|
||||
u64 block, sleep;
|
||||
|
||||
block = tsk->se.statistics.block_start;
|
||||
sleep = tsk->se.statistics.sleep_start;
|
||||
tsk->se.statistics.block_start = 0;
|
||||
tsk->se.statistics.sleep_start = 0;
|
||||
|
||||
return block ? block : sleep ? sleep : 0;
|
||||
#else
|
||||
return 0;
|
||||
#endif
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Tracepoint for accounting sleeptime (time the task is sleeping
|
||||
* or waiting for I/O).
|
||||
*/
|
||||
TRACE_EVENT(sched_stat_sleeptime,
|
||||
|
||||
TP_PROTO(struct task_struct *tsk, u64 now),
|
||||
|
||||
TP_ARGS(tsk, now),
|
||||
|
||||
TP_STRUCT__entry(
|
||||
__array( char, comm, TASK_COMM_LEN )
|
||||
__field( pid_t, pid )
|
||||
__field( u64, sleeptime )
|
||||
),
|
||||
|
||||
TP_fast_assign(
|
||||
memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN);
|
||||
__entry->pid = tsk->pid;
|
||||
__entry->sleeptime = trace_get_sleeptime(tsk);
|
||||
__entry->sleeptime = __entry->sleeptime ?
|
||||
now - __entry->sleeptime : 0;
|
||||
)
|
||||
TP_perf_assign(
|
||||
__perf_count(__entry->sleeptime);
|
||||
),
|
||||
|
||||
TP_printk("comm=%s pid=%d sleeptime=%Lu [ns]",
|
||||
__entry->comm, __entry->pid,
|
||||
(unsigned long long)__entry->sleeptime)
|
||||
);
|
||||
|
||||
/*
|
||||
* Tracepoint for showing priority inheritance modifying a tasks
|
||||
* priority.
|
||||
|
|
|
@ -1937,6 +1937,7 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev)
|
|||
local_irq_enable();
|
||||
#endif /* __ARCH_WANT_INTERRUPTS_ON_CTXSW */
|
||||
finish_lock_switch(rq, prev);
|
||||
trace_sched_stat_sleeptime(current, rq->clock);
|
||||
|
||||
fire_sched_in_preempt_notifiers(current);
|
||||
if (mm)
|
||||
|
|
|
@ -1003,7 +1003,6 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
|
|||
if (unlikely(delta > se->statistics.sleep_max))
|
||||
se->statistics.sleep_max = delta;
|
||||
|
||||
se->statistics.sleep_start = 0;
|
||||
se->statistics.sum_sleep_runtime += delta;
|
||||
|
||||
if (tsk) {
|
||||
|
@ -1020,7 +1019,6 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
|
|||
if (unlikely(delta > se->statistics.block_max))
|
||||
se->statistics.block_max = delta;
|
||||
|
||||
se->statistics.block_start = 0;
|
||||
se->statistics.sum_sleep_runtime += delta;
|
||||
|
||||
if (tsk) {
|
||||
|
|
Loading…
Reference in New Issue