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From: "Joel Fernandes (Google)" <joel@joelfernandes.org>
To: linux-kernel@vger.kernel.org,
	Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
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	Daniel Bristot de Oliveira <bristot@redhat.com>,
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Cc: Suleiman Souhlal <suleiman@google.com>,
	Youssef Esmat <youssefesmat@google.com>,
	David Vernet <void@manifault.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Paul E . McKenney" <paulmck@kernel.org>,
	joseph.salisbury@canonical.com,
	Luca Abeni <luca.abeni@santannapisa.it>,
	Tommaso Cucinotta <tommaso.cucinotta@santannapisa.it>,
	Vineeth Pillai <vineeth@bitbyteword.org>,
	Shuah Khan <skhan@linuxfoundation.org>,
	Phil Auld <pauld@redhat.com>,
	"Joel Fernandes (Google)" <joel@joelfernandes.org>
Subject: [PATCH v2 14/15] sched/deadline: Do not restart the DL server on replenish from timer
Date: Tue, 12 Mar 2024 21:24:50 -0400
Message-Id: <20240313012451.1693807-15-joel@joelfernandes.org>
In-Reply-To: <20240313012451.1693807-1-joel@joelfernandes.org>
References: <20240313012451.1693807-1-joel@joelfernandes.org>
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There is no point in doing so if there are no CFS tasks to run. If there
were, we would be doing ENQUEUE_REPLENISH from the dl_task_timer,
instead of calling replenish_dl_entity(). Fix that.

Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
---
 kernel/sched/deadline.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index e978e299381c..179369d27f66 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -915,7 +915,7 @@ static void replenish_dl_entity(struct sched_dl_entity *dl_se)
 	 */
 	if (dl_se->dl_defer &&
 	    dl_time_before(rq_clock(rq), dl_se->deadline - dl_se->runtime)) {
-		if (!is_dl_boosted(dl_se)) {
+		if (!is_dl_boosted(dl_se) && dl_se->server_has_tasks(dl_se)) {
 			dl_se->dl_defer_armed = 1;
 			dl_se->dl_throttled = 1;
 			if (!start_dl_timer(dl_se)) {
-- 
2.34.1