[tip: sched/core] sched: Do not construct nor expose RT_GROUP_SCHED structures if disabled

[tip-bot2 for Michal Koutný]

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

Commit-ID:     d6809c2f606c14f9e95be87d75a576901d2fa050
Gitweb:        https://git.kernel.org/tip/d6809c2f606c14f9e95be87d75a576901d2fa050
Author:        Michal Koutný <mkoutny@xxxxxxxx>
AuthorDate:    Mon, 10 Mar 2025 18:04:39 +01:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Tue, 08 Apr 2025 20:55:54 +02:00

sched: Do not construct nor expose RT_GROUP_SCHED structures if disabled

Thanks to kernel cmdline being available early, before any
cgroup hierarchy exists, we can achieve the RT_GROUP_SCHED boottime
disabling goal by simply skipping any creation (and destruction) of
RT_GROUP data and its exposure via RT attributes.

We can do this thanks to previously placed runtime guards that would
redirect all operations to root_task_group's data when RT_GROUP_SCHED
disabled.

Signed-off-by: Michal Koutný <mkoutny@xxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20250310170442.504716-8-mkoutny@xxxxxxxx
---
 kernel/sched/core.c | 36 ++++++++++++++++++++++++------------
 kernel/sched/rt.c   |  9 +++++++++
 2 files changed, 33 insertions(+), 12 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 6900ce5..79692f8 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -9867,18 +9867,6 @@ static struct cftype cpu_legacy_files[] = {
 		.seq_show = cpu_cfs_local_stat_show,
 	},
 #endif
-#ifdef CONFIG_RT_GROUP_SCHED
-	{
-		.name = "rt_runtime_us",
-		.read_s64 = cpu_rt_runtime_read,
-		.write_s64 = cpu_rt_runtime_write,
-	},
-	{
-		.name = "rt_period_us",
-		.read_u64 = cpu_rt_period_read_uint,
-		.write_u64 = cpu_rt_period_write_uint,
-	},
-#endif
 #ifdef CONFIG_UCLAMP_TASK_GROUP
 	{
 		.name = "uclamp.min",
@@ -9897,6 +9885,20 @@ static struct cftype cpu_legacy_files[] = {
 };
 
 #ifdef CONFIG_RT_GROUP_SCHED
+static struct cftype rt_group_files[] = {
+	{
+		.name = "rt_runtime_us",
+		.read_s64 = cpu_rt_runtime_read,
+		.write_s64 = cpu_rt_runtime_write,
+	},
+	{
+		.name = "rt_period_us",
+		.read_u64 = cpu_rt_period_read_uint,
+		.write_u64 = cpu_rt_period_write_uint,
+	},
+	{ }	/* Terminate */
+};
+
 # ifdef CONFIG_RT_GROUP_SCHED_DEFAULT_DISABLED
 DEFINE_STATIC_KEY_FALSE(rt_group_sched);
 # else
@@ -9919,6 +9921,16 @@ static int __init setup_rt_group_sched(char *str)
 	return 1;
 }
 __setup("rt_group_sched=", setup_rt_group_sched);
+
+static int __init cpu_rt_group_init(void)
+{
+	if (!rt_group_sched_enabled())
+		return 0;
+
+	WARN_ON(cgroup_add_legacy_cftypes(&cpu_cgrp_subsys, rt_group_files));
+	return 0;
+}
+subsys_initcall(cpu_rt_group_init);
 #endif /* CONFIG_RT_GROUP_SCHED */
 
 static int cpu_extra_stat_show(struct seq_file *sf,
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 5e82bfe..b611934 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -193,6 +193,9 @@ static inline struct rq *rq_of_rt_se(struct sched_rt_entity *rt_se)
 
 void unregister_rt_sched_group(struct task_group *tg)
 {
+	if (!rt_group_sched_enabled())
+		return;
+
 	if (tg->rt_se)
 		destroy_rt_bandwidth(&tg->rt_bandwidth);
 }
@@ -201,6 +204,9 @@ void free_rt_sched_group(struct task_group *tg)
 {
 	int i;
 
+	if (!rt_group_sched_enabled())
+		return;
+
 	for_each_possible_cpu(i) {
 		if (tg->rt_rq)
 			kfree(tg->rt_rq[i]);
@@ -245,6 +251,9 @@ int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
 	struct sched_rt_entity *rt_se;
 	int i;
 
+	if (!rt_group_sched_enabled())
+		return 1;
+
 	tg->rt_rq = kcalloc(nr_cpu_ids, sizeof(rt_rq), GFP_KERNEL);
 	if (!tg->rt_rq)
 		goto err;