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sched/debug: Add debugfs knob for "sched_debug"

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I'm forever late for editing my kernel cmdline, add a runtime knob to
disable the "sched_debug" thing.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170907150614.142924283@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2017-09-07 17:03:53 +02:00 committed by Ingo Molnar
parent 4ff9083b8a
commit 9469eb01db
3 changed files with 8 additions and 3 deletions
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5
kernel/sched/debug.c
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@ -181,11 +181,16 @@ static const struct file_operations sched_feat_fops = {
.release = single_release,
};
__read_mostly bool sched_debug_enabled;
static __init int sched_init_debug(void)
{
debugfs_create_file("sched_features", 0644, NULL, NULL,
&sched_feat_fops);
debugfs_create_bool("sched_debug", 0644, NULL,
&sched_debug_enabled);
return 0;
}
late_initcall(sched_init_debug);

2
kernel/sched/sched.h
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@ -1954,6 +1954,8 @@ extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq);
extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq);
#ifdef CONFIG_SCHED_DEBUG
extern bool sched_debug_enabled;
extern void print_cfs_stats(struct seq_file *m, int cpu);
extern void print_rt_stats(struct seq_file *m, int cpu);
extern void print_dl_stats(struct seq_file *m, int cpu);

4
kernel/sched/topology.c
View File

@ -14,11 +14,9 @@ cpumask_var_t sched_domains_tmpmask2;
#ifdef CONFIG_SCHED_DEBUG
static __read_mostly int sched_debug_enabled;
static int __init sched_debug_setup(char *str)
{
sched_debug_enabled = 1;
sched_debug_enabled = true;
return 0;
}