commit 3be9a220c1be739e7cc13aa778c2d97064ff430e
author Matt Wagantall <mattw@codeaurora.org> Thu Dec 05 20:01:32 2013 -0800
committer Ethan Chen <intervigil@gmail.com> Fri Jan 17 22:12:29 2014 -0800
tree f36ebe7bd393590e677348e8b26b1dcfa00149cb
parent f2ee187924b3fdb2475fc86641a8508f3c579abd

sched/debug: Make sysrq prints of sched debug data optional

Calls to sysrq_sched_debug_show() can yield rather verbose output
which contributes to log spew and, under heavy load, may increase
the chances of a watchdog bark.

Make printing of this data optional with the introduction of a
new Kconfig, CONFIG_SYSRQ_SCHED_DEBUG.

Change-Id: I5f54d901d0dea403109f7ac33b8881d967a899ed
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>

kernel/sched/core.c

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index a61171d..5c26f3d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5058,7 +5058,7 @@
 
 	touch_all_softlockup_watchdogs();
 
-#ifdef CONFIG_SCHED_DEBUG
+#ifdef CONFIG_SYSRQ_SCHED_DEBUG
 	sysrq_sched_debug_show();
 #endif
 	rcu_read_unlock();

kernel/sched/debug.c

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 2f9ac8f..20e311b 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -382,10 +382,12 @@
 	return 0;
 }
 
+#ifdef CONFIG_SYSRQ_SCHED_DEBUG
 void sysrq_sched_debug_show(void)
 {
 	sched_debug_show(NULL, NULL);
 }
+#endif
 
 static int sched_debug_open(struct inode *inode, struct file *filp)
 {

kernel/sched/sched.h

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 51a0b08..9b8ed6b 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -869,7 +869,9 @@
 
 #endif
 
+#ifdef CONFIG_SYSRQ_SCHED_DEBUG
 extern void sysrq_sched_debug_show(void);
+#endif
 extern void sched_init_granularity(void);
 extern void update_max_interval(void);
 extern void update_group_power(struct sched_domain *sd, int cpu);