linux-kernel - [PATCH 05/11] sched/deadline: Add a server arg to dl_server_update_idle

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Message-ID: <20251029191111.167537-6-arighi@nvidia.com>
Date: Wed, 29 Oct 2025 20:08:42 +0100
From: Andrea Righi <arighi@...dia.com>
To: Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Tejun Heo <tj@...nel.org>,
	David Vernet <void@...ifault.com>,
	Changwoo Min <changwoo@...lia.com>,
	Shuah Khan <shuah@...nel.org>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Christian Loehle <christian.loehle@....com>,
	Emil Tsalapatis <emil@...alapatis.com>,
	Luigi De Matteis <ldematteis123@...il.com>,
	sched-ext@...ts.linux.dev,
	bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 05/11] sched/deadline: Add a server arg to dl_server_update_idle_time()

From: Joel Fernandes <joelagnelf@...dia.com>

Since we are adding more servers, make dl_server_update_idle_time()
accept a server argument rather than a specific server.

v2: - rename rq_dl_server to dl_server (Peter Zijlstra)

Acked-by: Juri Lelli <juri.lelli@...hat.com>
Reviewed-by: Andrea Righi <arighi@...dia.com>
Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
---
 kernel/sched/deadline.c | 16 ++++++++--------
 kernel/sched/fair.c     |  2 +-
 kernel/sched/idle.c     |  2 +-
 kernel/sched/sched.h    |  3 ++-
 4 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 8aff1aba7b8a9..6ecfaaa1f912d 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1543,26 +1543,26 @@ static void update_curr_dl_se(struct rq *rq, struct sched_dl_entity *dl_se, s64
  * as time available for the dl_server, avoiding a penalty for the rt
  * scheduler that did not consumed that time.
  */
-void dl_server_update_idle_time(struct rq *rq, struct task_struct *p)
+void dl_server_update_idle_time(struct rq *rq, struct task_struct *p,
+			       struct sched_dl_entity *dl_server)
 {
 	s64 delta_exec;
 
-	if (!rq->fair_server.dl_defer)
+	if (!dl_server->dl_defer)
 		return;
 
 	/* no need to discount more */
-	if (rq->fair_server.runtime < 0)
+	if (dl_server->runtime < 0)
 		return;
 
 	delta_exec = rq_clock_task(rq) - p->se.exec_start;
 	if (delta_exec < 0)
 		return;
 
-	rq->fair_server.runtime -= delta_exec;
-
-	if (rq->fair_server.runtime < 0) {
-		rq->fair_server.dl_defer_running = 0;
-		rq->fair_server.runtime = 0;
+	dl_server->runtime -= delta_exec;
+	if (dl_server->runtime < 0) {
+		dl_server->dl_defer_running = 0;
+		dl_server->runtime = 0;
 	}
 
 	p->se.exec_start = rq_clock_task(rq);
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 2554055c1ba13..562cdd253678a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6999,7 +6999,7 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
 	if (!rq_h_nr_queued && rq->cfs.h_nr_queued) {
 		/* Account for idle runtime */
 		if (!rq->nr_running)
-			dl_server_update_idle_time(rq, rq->curr);
+			dl_server_update_idle_time(rq, rq->curr, &rq->fair_server);
 		dl_server_start(&rq->fair_server);
 	}
 
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 7fa0b593bcff7..60a19ea9bdbb7 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -454,7 +454,7 @@ static void wakeup_preempt_idle(struct rq *rq, struct task_struct *p, int flags)
 
 static void put_prev_task_idle(struct rq *rq, struct task_struct *prev, struct task_struct *next)
 {
-	dl_server_update_idle_time(rq, prev);
+	dl_server_update_idle_time(rq, prev, &rq->fair_server);
 	scx_update_idle(rq, false, true);
 }
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 4a0bf38dc71e9..eaae470841dea 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -412,7 +412,8 @@ extern void dl_server_init(struct sched_dl_entity *dl_se, struct rq *rq,
 extern void sched_init_dl_servers(void);
 
 extern void dl_server_update_idle_time(struct rq *rq,
-		    struct task_struct *p);
+		    struct task_struct *p,
+		    struct sched_dl_entity *rq_dl_server);
 extern void fair_server_init(struct rq *rq);
 extern void __dl_server_attach_root(struct sched_dl_entity *dl_se, struct rq *rq);
 extern int dl_server_apply_params(struct sched_dl_entity *dl_se,
-- 
2.51.2