linux-kernel - [PATCH] sched: move deadline_period sysctls to deadline.c

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Date:   Fri, 11 Feb 2022 15:00:14 +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] sched: move deadline_period sysctls to deadline.c

move deadline_period sysctls to deadline.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 |  3 ---
 kernel/sched/deadline.c      | 43 +++++++++++++++++++++++++++++-------
 kernel/sysctl.c              | 14 ------------
 3 files changed, 35 insertions(+), 25 deletions(-)

diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h
index c19dd5a2c05c..facdf2dbc83a 100644
--- a/include/linux/sched/sysctl.h
+++ b/include/linux/sched/sysctl.h
@@ -32,9 +32,6 @@ enum sched_tunable_scaling {
 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;
-
 #ifdef CONFIG_UCLAMP_TASK
 extern unsigned int sysctl_sched_uclamp_util_min;
 extern unsigned int sysctl_sched_uclamp_util_max;
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index d2c072b0ef01..8f094ed8e8db 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -20,6 +20,40 @@
 
 struct dl_bandwidth def_dl_bandwidth;
 
+/*
+ * Default limits for DL period; on the top end we guard against small util
+ * tasks still getting ridiculously long effective runtimes, on the bottom end we
+ * guard against timer DoS.
+ */
+static unsigned int sysctl_sched_dl_period_max = 1 << 22; /* ~4 seconds */
+static unsigned int sysctl_sched_dl_period_min = 100;     /* 100 us */
+#ifdef CONFIG_SYSCTL
+static struct ctl_table sched_dl_sysctls[] = {
+	{
+		.procname       = "sched_deadline_period_max_us",
+		.data           = &sysctl_sched_dl_period_max,
+		.maxlen         = sizeof(unsigned int),
+		.mode           = 0644,
+		.proc_handler   = proc_dointvec,
+	},
+	{
+		.procname       = "sched_deadline_period_min_us",
+		.data           = &sysctl_sched_dl_period_min,
+		.maxlen         = sizeof(unsigned int),
+		.mode           = 0644,
+		.proc_handler   = proc_dointvec,
+	},
+	{}
+};
+
+static void __init sched_dl_sysctl_init(void)
+{
+	register_sysctl_init("kernel", sched_dl_sysctls);
+}
+#else
+#define sched_dl_sysctl_init() do { } while (0)
+#endif
+
 static inline struct task_struct *dl_task_of(struct sched_dl_entity *dl_se)
 {
 	return container_of(dl_se, struct task_struct, dl);
@@ -2487,6 +2521,7 @@ void __init init_sched_dl_class(void)
 	for_each_possible_cpu(i)
 		zalloc_cpumask_var_node(&per_cpu(local_cpu_mask_dl, i),
 					GFP_KERNEL, cpu_to_node(i));
+	sched_dl_sysctl_init();
 }
 
 void dl_add_task_root_domain(struct task_struct *p)
@@ -2854,14 +2889,6 @@ void __getparam_dl(struct task_struct *p, struct sched_attr *attr)
 	attr->sched_flags |= dl_se->flags;
 }
 
-/*
- * Default limits for DL period; on the top end we guard against small util
- * tasks still getting ridiculously long effective runtimes, on the bottom end we
- * guard against timer DoS.
- */
-unsigned int sysctl_sched_dl_period_max = 1 << 22; /* ~4 seconds */
-unsigned int sysctl_sched_dl_period_min = 100;     /* 100 us */
-
 /*
  * This function validates the new parameters of a -deadline task.
  * We ask for the deadline not being zero, and greater or equal
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 5ae443b2882e..d880a78598a1 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1706,20 +1706,6 @@ static struct ctl_table kern_table[] = {
 		.mode		= 0644,
 		.proc_handler	= sched_rt_handler,
 	},
-	{
-		.procname	= "sched_deadline_period_max_us",
-		.data		= &sysctl_sched_dl_period_max,
-		.maxlen		= sizeof(unsigned int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
-	},
-	{
-		.procname	= "sched_deadline_period_min_us",
-		.data		= &sysctl_sched_dl_period_min,
-		.maxlen		= sizeof(unsigned int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
-	},
 	{
 		.procname	= "sched_rr_timeslice_ms",
 		.data		= &sysctl_sched_rr_timeslice,
-- 
2.20.1