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From:   Yafang Shao <laoar.shao@gmail.com>
To:     mgorman@suse.de, mingo@redhat.com, peterz@infradead.org,
        juri.lelli@redhat.com, vincent.guittot@linaro.org,
        dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com,
        bristot@redhat.com, qianjun.kernel@gmail.com
Cc:     linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
        Yafang Shao <laoar.shao@gmail.com>
Subject: [PATCH 5/6] sched, rt: support sched_stat_runtime tracepoint for RT sched class
Date:   Tue,  1 Dec 2020 19:54:15 +0800
Message-Id: <20201201115416.26515-6-laoar.shao@gmail.com>
In-Reply-To: <20201201115416.26515-1-laoar.shao@gmail.com>
References: <20201201115416.26515-1-laoar.shao@gmail.com>
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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