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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-07-23 20:13:26 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-02 09:12:18 +0200
commit768d0c27226e6587cad2fcf543f9711da3f3774e (patch)
tree0e299fb34584ff3c5c59f3ed95da70aab372dbc7 /kernel/sched_fair.c
parent8f0dfc34e9b323a028c2ec41abb7e9de477b7a94 (diff)
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>
Diffstat (limited to 'kernel/sched_fair.c')
-rw-r--r--kernel/sched_fair.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 471fa281f5e0..2ff850f90d1e 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);
}
/*