Commit ed7b564c authored by Yafang Shao's avatar Yafang Shao Committed by Peter Zijlstra
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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: default avatarYafang Shao <laoar.shao@gmail.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210905143547.4668-6-laoar.shao@gmail.com
parent 847fc0cd

kernel/sched/rt.c

+2 −0
Original line number Diff line number Diff line
@@ -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);