linux-kernel - [PATCH 5/6] sched, rt: support sched_stat_runtime tracepoint for RT sched class

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Message-Id: <20201201115416.26515-6-laoar.shao@gmail.com>
Date:   Tue,  1 Dec 2020 19:54:15 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     mgorman@...e.de, mingo@...hat.com, peterz@...radead.org,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        bristot@...hat.com, qianjun.kernel@...il.com
Cc:     linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
        Yafang Shao <laoar.shao@...il.com>
Subject: [PATCH 5/6] 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
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@...il.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