linux-kernel - [PATCH v3 6/7] sched, rt: support sched_stat

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Message-Id: <20210824112946.9324-7-laoar.shao@gmail.com>
Date:   Tue, 24 Aug 2021 11:29:45 +0000
From:   Yafang Shao <laoar.shao@...il.com>
To:     mingo@...hat.com, peterz@...radead.org, mgorman@...e.de,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        bristot@...hat.com, achaiken@...ora.tech
Cc:     lkp@...el.com, linux-kernel@...r.kernel.org,
        linux-rt-users@...r.kernel.org, Yafang Shao <laoar.shao@...il.com>
Subject: [PATCH v3 6/7] 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@...il.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Alison Chaiken <achaiken@...ora.tech>
---
 kernel/sched/rt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 95a7c3ad2dc3..5d251112e51c 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);
 
-- 
2.18.2