diff options
| author | Matt Wagantall <mattw@codeaurora.org> | 2013-12-05 20:01:32 -0800 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-23 19:58:37 -0700 |
| commit | 5f10bd75eb0ef27794e28674c3b72865d846c385 (patch) | |
| tree | 0426ddb3f2bd2cb0522cb60150d3336b0f519bec | |
| parent | 521a572defaba88bef6d44ebf05c71aad9abd821 (diff) | |
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>
| -rw-r--r-- | kernel/sched/core.c | 2 | ||||
| -rw-r--r-- | kernel/sched/debug.c | 2 | ||||
| -rw-r--r-- | kernel/sched/sched.h | 2 | ||||
| -rw-r--r-- | lib/Kconfig.debug | 9 |
4 files changed, 14 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 782c1ff86c73..e6bc81b37369 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -4994,7 +4994,7 @@ void show_state_filter(unsigned long state_filter) touch_all_softlockup_watchdogs(); -#ifdef CONFIG_SCHED_DEBUG +#ifdef CONFIG_SYSRQ_SCHED_DEBUG sysrq_sched_debug_show(); #endif rcu_read_unlock(); diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index 641511771ae6..5799706cc6f0 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -408,6 +408,7 @@ static int sched_debug_show(struct seq_file *m, void *v) return 0; } +#ifdef CONFIG_SYSRQ_SCHED_DEBUG void sysrq_sched_debug_show(void) { int cpu; @@ -417,6 +418,7 @@ void sysrq_sched_debug_show(void) print_cpu(NULL, cpu); } +#endif /* * This itererator needs some explanation. diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 825ce4eaf47a..fffe2623477a 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1299,7 +1299,9 @@ static inline struct cpuidle_state *idle_get_state(struct rq *rq) } #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); diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 56b9db804d8c..23972e246b7b 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -876,6 +876,15 @@ config PANIC_ON_RT_THROTTLING Say N if unsure. +config SYSRQ_SCHED_DEBUG + bool "Print scheduling debugging info from sysrq-trigger" + depends on SCHED_DEBUG + default y + help + If you say Y here, the "show-task-states(T)" and + "show-blocked-tasks(W)" sysrq-triggers will print additional + scheduling statistics. + config SCHEDSTATS bool "Collect scheduler statistics" depends on DEBUG_KERNEL && PROC_FS |