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Message-Id: <20220215114604.25772-4-nizhen@uniontech.com>
Date: Tue, 15 Feb 2022 19:45:59 +0800
From: Zhen Ni <nizhen@...ontech.com>
To: mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
vincent.guittot@...aro.org, mcgrof@...nel.org,
keescook@...omium.org
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
Zhen Ni <nizhen@...ontech.com>
Subject: [PATCH v3 3/8] sched: Move rt_period/runtime sysctls to rt.c
move rt_period/runtime sysctls to rt.c and use the new
register_sysctl_init() to register the sysctl interface.
Signed-off-by: Zhen Ni <nizhen@...ontech.com>
---
include/linux/sched/sysctl.h | 11 ---------
kernel/rcu/rcu.h | 2 ++
kernel/sched/core.c | 13 -----------
kernel/sched/rt.c | 43 +++++++++++++++++++++++++++++++++++-
kernel/sched/sched.h | 4 ++++
kernel/sysctl.c | 14 ------------
6 files changed, 48 insertions(+), 39 deletions(-)
diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h
index ffe42509a595..99fbf61464ab 100644
--- a/include/linux/sched/sysctl.h
+++ b/include/linux/sched/sysctl.h
@@ -21,15 +21,6 @@ enum sched_tunable_scaling {
SCHED_TUNABLESCALING_END,
};
-/*
- * control realtime throttling:
- *
- * /proc/sys/kernel/sched_rt_period_us
- * /proc/sys/kernel/sched_rt_runtime_us
- */
-extern unsigned int sysctl_sched_rt_period;
-extern int sysctl_sched_rt_runtime;
-
extern unsigned int sysctl_sched_dl_period_max;
extern unsigned int sysctl_sched_dl_period_min;
@@ -48,8 +39,6 @@ extern int sched_rr_timeslice;
int sched_rr_handler(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
-int sched_rt_handler(struct ctl_table *table, int write, void *buffer,
- size_t *lenp, loff_t *ppos);
int sysctl_sched_uclamp_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
int sysctl_numa_balancing(struct ctl_table *table, int write, void *buffer,
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index 24b5f2c2de87..7812c740b3bf 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -23,6 +23,8 @@
#define RCU_SEQ_CTR_SHIFT 2
#define RCU_SEQ_STATE_MASK ((1 << RCU_SEQ_CTR_SHIFT) - 1)
+extern int sysctl_sched_rt_runtime;
+
/*
* Return the counter portion of a sequence number previously returned
* by rcu_seq_snap() or rcu_seq_current().
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 3c1239c61b45..276033cceaf2 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -81,12 +81,6 @@ const_debug unsigned int sysctl_sched_nr_migrate = 8;
const_debug unsigned int sysctl_sched_nr_migrate = 32;
#endif
-/*
- * period over which we measure -rt task CPU usage in us.
- * default: 1s
- */
-unsigned int sysctl_sched_rt_period = 1000000;
-
__read_mostly int scheduler_running;
#ifdef CONFIG_SCHED_CORE
@@ -380,13 +374,6 @@ sched_core_dequeue(struct rq *rq, struct task_struct *p, int flags) { }
#endif /* CONFIG_SCHED_CORE */
-/*
- * part of the period that we allow rt tasks to run in us.
- * default: 0.95s
- */
-int sysctl_sched_rt_runtime = 950000;
-
-
/*
* Serialization rules:
*
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 7b4f4fbbb404..1106828c4236 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -16,6 +16,47 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun);
struct rt_bandwidth def_rt_bandwidth;
+/*
+ * period over which we measure -rt task CPU usage in us.
+ * default: 1s
+ */
+unsigned int sysctl_sched_rt_period = 1000000;
+
+/*
+ * part of the period that we allow rt tasks to run in us.
+ * default: 0.95s
+ */
+int sysctl_sched_rt_runtime = 950000;
+
+static int sched_rt_handler(struct ctl_table *table, int write, void *buffer,
+ size_t *lenp, loff_t *ppos);
+#ifdef CONFIG_SYSCTL
+static struct ctl_table sched_rt_sysctls[] = {
+ {
+ .procname = "sched_rt_period_us",
+ .data = &sysctl_sched_rt_period,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = sched_rt_handler,
+ },
+ {
+ .procname = "sched_rt_runtime_us",
+ .data = &sysctl_sched_rt_runtime,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = sched_rt_handler,
+ },
+ {}
+};
+
+static int __init sched_rt_sysctl_init(void)
+{
+ register_sysctl_init("kernel", sched_rt_sysctls);
+ return 0;
+}
+late_initcall(sched_rt_sysctl_init);
+#endif
+
static enum hrtimer_restart sched_rt_period_timer(struct hrtimer *timer)
{
struct rt_bandwidth *rt_b =
@@ -2928,7 +2969,7 @@ static void sched_rt_do_global(void)
raw_spin_unlock_irqrestore(&def_rt_bandwidth.rt_runtime_lock, flags);
}
-int sched_rt_handler(struct ctl_table *table, int write, void *buffer,
+static int sched_rt_handler(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos)
{
int old_period, old_runtime;
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 27465635c774..385e74095434 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -102,6 +102,10 @@ extern void calc_global_load_tick(struct rq *this_rq);
extern long calc_load_fold_active(struct rq *this_rq, long adjust);
extern void call_trace_sched_update_nr_running(struct rq *rq, int count);
+
+extern unsigned int sysctl_sched_rt_period;
+extern int sysctl_sched_rt_runtime;
+
/*
* Helpers for converting nanosecond timing to jiffy resolution
*/
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 88ff6b27f8ab..73cccd935d65 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1674,20 +1674,6 @@ static struct ctl_table kern_table[] = {
.extra2 = SYSCTL_ONE,
},
#endif /* CONFIG_NUMA_BALANCING */
- {
- .procname = "sched_rt_period_us",
- .data = &sysctl_sched_rt_period,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = sched_rt_handler,
- },
- {
- .procname = "sched_rt_runtime_us",
- .data = &sysctl_sched_rt_runtime,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = sched_rt_handler,
- },
{
.procname = "sched_deadline_period_max_us",
.data = &sysctl_sched_dl_period_max,
--
2.20.1
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