linux-kernel - [PATCH v4 7/8] sched, dl: support sched_stat_runtime tracepoint for deadline sched class

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Message-Id: <20210905143547.4668-8-laoar.shao@gmail.com>
Date:   Sun,  5 Sep 2021 14:35:46 +0000
From:   Yafang Shao <laoar.shao@...il.com>
To:     peterz@...radead.org, mingo@...hat.com, mgorman@...e.de,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        bristot@...hat.com
Cc:     linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
        achaiken@...ora.tech, Yafang Shao <laoar.shao@...il.com>
Subject: [PATCH v4 7/8] sched, dl: support sched_stat_runtime tracepoint for deadline sched class

The runtime of a DL task has already been there, so we only need to
add a tracepoint.

One difference between fair task and DL task is that there is no vruntime
in dl task. To reuse the sched_stat_runtime tracepoint, '0' is passed as
vruntime for DL task.

The output of this tracepoint for DL task as follows,
             top-36462   [047] d.h.  6083.452103: sched_stat_runtime: comm=top pid=36462 runtime=409898 [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/deadline.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 51dd30990042..73fb33e1868f 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1268,6 +1268,8 @@ static void update_curr_dl(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