linux-kernel - [tip: sched/core] sched/deadline: Remove superfluous rq clock update in push_dl

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Message-ID: <165229843321.4207.9114080870680211177.tip-bot2@tip-bot2>
Date:   Wed, 11 May 2022 19:47:13 -0000
From:   "tip-bot2 for Hao Jia" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Hao Jia <jiahao.os@...edance.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/deadline: Remove superfluous rq clock update
 in push_dl_task()

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

Commit-ID:     734387ec2f9d77b00276042b1fa7c95f48ee879d
Gitweb:        https://git.kernel.org/tip/734387ec2f9d77b00276042b1fa7c95f48ee879d
Author:        Hao Jia <jiahao.os@...edance.com>
AuthorDate:    Sat, 30 Apr 2022 16:58:43 +08:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Wed, 11 May 2022 16:27:12 +02:00

sched/deadline: Remove superfluous rq clock update in push_dl_task()

The change to call update_rq_clock() before activate_task()
commit 840d719604b0 ("sched/deadline: Update rq_clock of later_rq
when pushing a task") is no longer needed since commit f4904815f97a
("sched/deadline: Fix double accounting of rq/running bw in push & pull")
removed the add_running_bw() before the activate_task().

So we remove some comments that are no longer needed and update
rq clock in activate_task().

Signed-off-by: Hao Jia <jiahao.os@...edance.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@....com>
Reviewed-by: Daniel Bristot de Oliveira <bristot@...hat.com>
Link: https://lore.kernel.org/r/20220430085843.62939-3-jiahao.os@bytedance.com
---
 kernel/sched/deadline.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 0ad2818..936817a 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -2318,13 +2318,7 @@ retry:
 
 	deactivate_task(rq, next_task, 0);
 	set_task_cpu(next_task, later_rq->cpu);
-
-	/*
-	 * Update the later_rq clock here, because the clock is used
-	 * by the cpufreq_update_util() inside __add_running_bw().
-	 */
-	update_rq_clock(later_rq);
-	activate_task(later_rq, next_task, ENQUEUE_NOCLOCK);
+	activate_task(later_rq, next_task, 0);
 	ret = 1;
 
 	resched_curr(later_rq);