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Commit f6630114 authored by Mike Travis's avatar Mike Travis Committed by Ingo Molnar
Browse files

sched: Limit the number of scheduler debug messages 



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

Signed-off-by: default avatarMike Travis <travis@sgi.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Roland Dreier <rdreier@cisco.com>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091118002221.489305000@alcatraz.americas.sgi.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 93335a21

Documentation/kernel-parameters.txt

+2 −0
Original line number Diff line number Diff line
@@ -2182,6 +2182,8 @@ and is between 256 and 4096 characters. It is defined in the file 


	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>]]

kernel/sched.c

+13 −0
Original line number Diff line number Diff line
@@ -7720,6 +7720,16 @@ early_initcall(migration_init); 


#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)

{
@@ -7806,6 +7816,9 @@ static void sched_domain_debug(struct sched_domain *sd, int cpu) 
	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;