[tip: sched/core] sched/rt: Support sched_stat_runtime tracepoint for RT sched class

[tip-bot2 for Yafang Shao]

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     75ded49a19c6b655bba7ff9e5541daef4f882d78
Gitweb:        https://git.kernel.org/tip/75ded49a19c6b655bba7ff9e5541daef4f882d78
Author:        Yafang Shao <laoar.shao@xxxxxxxxx>
AuthorDate:    Sun, 05 Sep 2021 14:35:44 
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Wed, 15 Sep 2021 17:48:59 +02:00

sched/rt: Support sched_stat_runtime tracepoint for RT sched class

The runtime of a RT task has already been there, so we only need to
add a tracepoint.

One difference between fair task and RT task is that there is no vruntime
in RT task. To reuse the sched_stat_runtime tracepoint, '0' is passed as
vruntime for RT task.

The output of this tracepoint for RT task as follows,
          stress-9748    [039] d.h.   113.519352: sched_stat_runtime: comm=stress pid=9748 runtime=997573 [ns] vruntime=0 [ns]
          stress-9748    [039] d.h.   113.520352: sched_stat_runtime: comm=stress pid=9748 runtime=997627 [ns] vruntime=0 [ns]
          stress-9748    [039] d.h.   113.521352: sched_stat_runtime: comm=stress pid=9748 runtime=998203 [ns] vruntime=0 [ns]

Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210905143547.4668-6-laoar.shao@xxxxxxxxx
---
 kernel/sched/rt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 95a7c3a..5d25111 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1012,6 +1012,8 @@ static void update_curr_rt(struct rq *rq)
 	schedstat_set(curr->stats.exec_max,
 		      max(curr->stats.exec_max, delta_exec));
 
+	trace_sched_stat_runtime(curr, delta_exec, 0);
+
 	curr->se.sum_exec_runtime += delta_exec;
 	account_group_exec_runtime(curr, delta_exec);