linux-kernel - [RFC PATCH v2 15/25] sched/rt: Remove old RT_GROUP

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Message-ID: <20250731105543.40832-16-yurand2000@gmail.com>
Date: Thu, 31 Jul 2025 12:55:33 +0200
From: Yuri Andriaccio <yurand2000@...il.com>
To: Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	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>
Cc: linux-kernel@...r.kernel.org,
	Luca Abeni <luca.abeni@...tannapisa.it>,
	Yuri Andriaccio <yuri.andriaccio@...tannapisa.it>
Subject: [RFC PATCH v2 15/25] sched/rt: Remove old RT_GROUP_SCHED data structures

From: luca abeni <luca.abeni@...tannapisa.it>

Completely remove the old RT_GROUP_SCHED's functions and data structures.

Co-developed-by: Yuri Andriaccio <yurand2000@...il.com>
Signed-off-by: Yuri Andriaccio <yurand2000@...il.com>
Signed-off-by: luca abeni <luca.abeni@...tannapisa.it>
---
 include/linux/sched.h |  4 ----
 kernel/sched/rt.c     |  1 -
 kernel/sched/sched.h  | 26 --------------------------
 3 files changed, 31 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index f0c8229afd1..343e8ef5ba1 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -621,13 +621,9 @@ struct sched_rt_entity {
 	unsigned short			on_rq;
 	unsigned short			on_list;
 
-	struct sched_rt_entity		*back;
 #ifdef CONFIG_RT_GROUP_SCHED
-	struct sched_rt_entity		*parent;
 	/* rq on which this entity is (to be) queued: */
 	struct rt_rq			*rt_rq;
-	/* rq "owned" by this entity/group: */
-	struct rt_rq			*my_q;
 #endif
 } __randomize_layout;
 
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index bd11f4a03f7..f37ac9100d1 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1,4 +1,3 @@
-#pragma GCC diagnostic ignored "-Wunused-function"
 // SPDX-License-Identifier: GPL-2.0
 /*
  * Real-Time Scheduling Class (mapped to the SCHED_FIFO and SCHED_RR
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 9f235df4bf1..4a1bbda3720 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -310,15 +310,6 @@ struct rt_prio_array {
 	struct list_head queue[MAX_RT_PRIO];
 };
 
-struct rt_bandwidth {
-	/* nests inside the rq lock: */
-	raw_spinlock_t		rt_runtime_lock;
-	ktime_t			rt_period;
-	u64			rt_runtime;
-	struct hrtimer		rt_period_timer;
-	unsigned int		rt_period_active;
-};
-
 struct dl_bandwidth {
 	raw_spinlock_t          dl_runtime_lock;
 	u64                     dl_runtime;
@@ -483,7 +474,6 @@ struct task_group {
 	struct sched_dl_entity	**dl_se;
 	struct rt_rq		**rt_rq;
 
-	struct rt_bandwidth	rt_bandwidth;
 	struct dl_bandwidth	dl_bandwidth;
 #endif
 
@@ -802,11 +792,6 @@ struct scx_rq {
 };
 #endif /* CONFIG_SCHED_CLASS_EXT */
 
-static inline int rt_bandwidth_enabled(void)
-{
-	return 0;
-}
-
 /* RT IPI pull logic requires IRQ_WORK */
 #if defined(CONFIG_IRQ_WORK) && defined(CONFIG_SMP)
 # define HAVE_RT_PUSH_IPI
@@ -824,17 +809,6 @@ struct rt_rq {
 	bool			overloaded;
 	struct plist_head	pushable_tasks;
 
-	int			rt_queued;
-
-#ifdef CONFIG_RT_GROUP_SCHED
-	int			rt_throttled;
-	u64			rt_time; /* consumed RT time, goes up in update_curr_rt */
-	u64			rt_runtime; /* allotted RT time, "slice" from rt_bandwidth, RT sharing/balancing */
-	/* Nests inside the rq lock: */
-	raw_spinlock_t		rt_runtime_lock;
-
-	unsigned int		rt_nr_boosted;
-#endif
 #ifdef CONFIG_CGROUP_SCHED
 	struct task_group	*tg; /* this tg has "this" rt_rq on given CPU for runnable entities */
 #endif
-- 
2.50.1