sched: Add wait, sleep and iowait accounting tracepoints
Add 3 schedstat tracepoints to help account for wait-time, sleep-time and iowait-time. They can also be used as a perf-counter source to profile tasks on these clocks. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Arjan van de Ven <arjan@linux.intel.com> LKML-Reference: <new-submission> [ build fix for the !CONFIG_SCHEDSTATS case ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
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2 changed files with 106 additions and 1 deletions
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@ -340,6 +340,101 @@ TRACE_EVENT(sched_signal_send,
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__entry->sig, __entry->comm, __entry->pid)
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);
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/*
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* XXX the below sched_stat tracepoints only apply to SCHED_OTHER/BATCH/IDLE
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* adding sched_stat support to SCHED_FIFO/RR would be welcome.
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*/
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/*
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* Tracepoint for accounting wait time (time the task is runnable
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* but not actually running due to scheduler contention).
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*/
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TRACE_EVENT(sched_stat_wait,
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TP_PROTO(struct task_struct *tsk, u64 delay),
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TP_ARGS(tsk, delay),
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TP_STRUCT__entry(
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__array( char, comm, TASK_COMM_LEN )
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__field( pid_t, pid )
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__field( u64, delay )
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),
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TP_fast_assign(
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memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN);
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__entry->pid = tsk->pid;
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__entry->delay = delay;
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)
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TP_perf_assign(
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__perf_count(delay);
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),
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TP_printk("task: %s:%d wait: %Lu [ns]",
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__entry->comm, __entry->pid,
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(unsigned long long)__entry->delay)
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);
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/*
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* Tracepoint for accounting sleep time (time the task is not runnable,
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* including iowait, see below).
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*/
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TRACE_EVENT(sched_stat_sleep,
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TP_PROTO(struct task_struct *tsk, u64 delay),
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TP_ARGS(tsk, delay),
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TP_STRUCT__entry(
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__array( char, comm, TASK_COMM_LEN )
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__field( pid_t, pid )
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__field( u64, delay )
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),
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TP_fast_assign(
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memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN);
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__entry->pid = tsk->pid;
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__entry->delay = delay;
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)
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TP_perf_assign(
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__perf_count(delay);
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),
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TP_printk("task: %s:%d sleep: %Lu [ns]",
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__entry->comm, __entry->pid,
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(unsigned long long)__entry->delay)
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);
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/*
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* Tracepoint for accounting iowait time (time the task is not runnable
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* due to waiting on IO to complete).
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*/
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TRACE_EVENT(sched_stat_iowait,
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TP_PROTO(struct task_struct *tsk, u64 delay),
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TP_ARGS(tsk, delay),
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TP_STRUCT__entry(
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__array( char, comm, TASK_COMM_LEN )
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__field( pid_t, pid )
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__field( u64, delay )
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),
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TP_fast_assign(
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memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN);
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__entry->pid = tsk->pid;
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__entry->delay = delay;
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)
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TP_perf_assign(
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__perf_count(delay);
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),
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TP_printk("task: %s:%d iowait: %Lu [ns]",
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__entry->comm, __entry->pid,
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(unsigned long long)__entry->delay)
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);
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#endif /* _TRACE_SCHED_H */
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/* This part must be outside protection */
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@ -546,6 +546,13 @@ update_stats_wait_end(struct cfs_rq *cfs_rq, struct sched_entity *se)
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schedstat_set(se->wait_sum, se->wait_sum +
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rq_of(cfs_rq)->clock - se->wait_start);
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schedstat_set(se->wait_start, 0);
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#ifdef CONFIG_SCHEDSTATS
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if (entity_is_task(se)) {
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trace_sched_stat_wait(task_of(se),
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rq_of(cfs_rq)->clock - se->wait_start);
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}
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#endif
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}
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static inline void
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@ -636,8 +643,10 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
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se->sleep_start = 0;
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se->sum_sleep_runtime += delta;
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if (tsk)
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if (tsk) {
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account_scheduler_latency(tsk, delta >> 10, 1);
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trace_sched_stat_sleep(tsk, delta);
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}
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}
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if (se->block_start) {
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u64 delta = rq_of(cfs_rq)->clock - se->block_start;
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@ -655,6 +664,7 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
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if (tsk->in_iowait) {
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se->iowait_sum += delta;
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se->iowait_count++;
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trace_sched_stat_iowait(tsk, delta);
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}
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/*
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