From 768d0c27226e6587cad2fcf543f9711da3f3774e Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Thu, 23 Jul 2009 20:13:26 +0200 Subject: 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 Cc: Steven Rostedt Cc: Frederic Weisbecker Cc: Arjan van de Ven LKML-Reference: [ build fix for the !CONFIG_SCHEDSTATS case ] Signed-off-by: Ingo Molnar --- kernel/sched_fair.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'kernel/sched_fair.c') diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 471fa281f5e..2ff850f90d1 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -546,6 +546,13 @@ update_stats_wait_end(struct cfs_rq *cfs_rq, struct sched_entity *se) schedstat_set(se->wait_sum, se->wait_sum + rq_of(cfs_rq)->clock - se->wait_start); schedstat_set(se->wait_start, 0); + +#ifdef CONFIG_SCHEDSTATS + if (entity_is_task(se)) { + trace_sched_stat_wait(task_of(se), + rq_of(cfs_rq)->clock - se->wait_start); + } +#endif } static inline void @@ -636,8 +643,10 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se) se->sleep_start = 0; se->sum_sleep_runtime += delta; - if (tsk) + if (tsk) { account_scheduler_latency(tsk, delta >> 10, 1); + trace_sched_stat_sleep(tsk, delta); + } } if (se->block_start) { u64 delta = rq_of(cfs_rq)->clock - se->block_start; @@ -655,6 +664,7 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se) if (tsk->in_iowait) { se->iowait_sum += delta; se->iowait_count++; + trace_sched_stat_iowait(tsk, delta); } /* -- cgit v1.2.3