linux-kernel - [tip: sched/core] sched/dl: Support sched_stat_runtime tracepoint for deadline sched class

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Date:   Tue, 05 Oct 2021 14:12:06 -0000
From:   "tip-bot2 for Yafang Shao" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Yafang Shao <laoar.shao@...il.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/dl: Support sched_stat_runtime tracepoint for
 deadline sched class

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     95fd58e8dadb7aa707628a2187c626bb897c49ec
Gitweb:        https://git.kernel.org/tip/95fd58e8dadb7aa707628a2187c626bb897c49ec
Author:        Yafang Shao <laoar.shao@...il.com>
AuthorDate:    Sun, 05 Sep 2021 14:35:46 
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 05 Oct 2021 15:51:52 +02:00

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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/20210905143547.4668-8-laoar.shao@gmail.com
---
 kernel/sched/deadline.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 51dd309..73fb33e 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);