[PATCH 4/5] sched: Limit the number of scheduler debug messages

[Mike Travis]

Remove the verbose scheduler debug messages unless kernel parameter
"sched_debug" set.  /proc/sched_debug unchanged.

Signed-off-by: Mike Travis <travis@xxxxxxx>
---
 Documentation/kernel-parameters.txt |    2 ++
 kernel/sched.c                      |   13 +++++++++++++
 2 files changed, 15 insertions(+)

--- linux.orig/Documentation/kernel-parameters.txt
+++ linux/Documentation/kernel-parameters.txt
@@ -2182,6 +2182,8 @@
 
 	sbni=		[NET] Granch SBNI12 leased line adapter
 
+	sched_debug	[KNL] Enables verbose scheduler debug messages.
+
 	sc1200wdt=	[HW,WDT] SC1200 WDT (watchdog) driver
 			Format: <io>[,<timeout>[,<isapnp>]]
 
--- linux.orig/kernel/sched.c
+++ linux/kernel/sched.c
@@ -7743,6 +7743,16 @@
 
 #ifdef CONFIG_SCHED_DEBUG
 
+static __read_mostly int sched_domain_debug_enabled;
+
+static int __init sched_domain_debug_setup(char *str)
+{
+	sched_domain_debug_enabled = 1;
+
+	return 0;
+}
+early_param("sched_debug", sched_domain_debug_setup);
+
 static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
 				  struct cpumask *groupmask)
 {
@@ -7829,6 +7839,9 @@
 	cpumask_var_t groupmask;
 	int level = 0;
 
+	if (!sched_domain_debug_enabled)
+		return;
+
 	if (!sd) {
 		printk(KERN_DEBUG "CPU%d attaching NULL sched-domain.\n", cpu);
 		return;

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