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Subject[PATCH 5/6] sched, rt: support sched_stat_runtime tracepoint for RT sched class
Date
The runtime of a RT task has already been there, so we only need to
place the sched_stat_runtime tracepoint there.

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@gmail.com>
---
kernel/sched/rt.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 2d543a270dfe..da989653b0a2 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1011,6 +1011,8 @@ 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);

--
2.18.4
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