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rcu: Print out rcupdate.c non-default boot-time settings 

This commit adds a rcupdate_announce_bootup_oddness() function to
print out non-default values of significant kernel boot parameter
settings to aid in debugging.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2017-04-28 10:20:28 -07:00
parent f4687d2637
commit 59d80fd835
3 changed files with 43 additions and 1 deletions
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1
include/linux/rcupdate.h
View File

@ -76,6 +76,7 @@ bool rcu_gp_is_normal(void); /* Internal RCU use. */
bool rcu_gp_is_expedited(void); /* Internal RCU use. */ bool rcu_gp_is_expedited(void); /* Internal RCU use. */
void rcu_expedite_gp(void); void rcu_expedite_gp(void);
void rcu_unexpedite_gp(void); void rcu_unexpedite_gp(void);
void rcupdate_announce_bootup_oddness(void);
#endif /* #else #ifdef CONFIG_TINY_RCU */ #endif /* #else #ifdef CONFIG_TINY_RCU */
enum rcutorture_type { enum rcutorture_type {

1
kernel/rcu/tree_plugin.h
View File

@ -92,6 +92,7 @@ static void __init rcu_bootup_announce_oddness(void)
pr_info("\tRCU restricting CPUs from NR_CPUS=%d to nr_cpu_ids=%d.\n", NR_CPUS, nr_cpu_ids); pr_info("\tRCU restricting CPUs from NR_CPUS=%d to nr_cpu_ids=%d.\n", NR_CPUS, nr_cpu_ids);
if (IS_ENABLED(CONFIG_RCU_BOOST)) if (IS_ENABLED(CONFIG_RCU_BOOST))
pr_info("\tRCU kthread priority: %d.\n", kthread_prio); pr_info("\tRCU kthread priority: %d.\n", kthread_prio);
rcupdate_announce_bootup_oddness();
} }
#ifdef CONFIG_PREEMPT_RCU #ifdef CONFIG_PREEMPT_RCU

42
kernel/rcu/update.c
View File

@ -560,7 +560,8 @@ static DEFINE_RAW_SPINLOCK(rcu_tasks_cbs_lock);
DEFINE_SRCU(tasks_rcu_exit_srcu); DEFINE_SRCU(tasks_rcu_exit_srcu);
/* Control stall timeouts. Disable with <= 0, otherwise jiffies till stall. */ /* Control stall timeouts. Disable with <= 0, otherwise jiffies till stall. */
static int rcu_task_stall_timeout __read_mostly = HZ * 60 * 10; #define RCU_TASK_STALL_TIMEOUT (HZ * 60 * 10)
static int rcu_task_stall_timeout __read_mostly = RCU_TASK_STALL_TIMEOUT;
module_param(rcu_task_stall_timeout, int, 0644); module_param(rcu_task_stall_timeout, int, 0644);
static void rcu_spawn_tasks_kthread(void); static void rcu_spawn_tasks_kthread(void);
@ -851,6 +852,23 @@ static void rcu_spawn_tasks_kthread(void)
#endif /* #ifdef CONFIG_TASKS_RCU */ #endif /* #ifdef CONFIG_TASKS_RCU */
#ifndef CONFIG_TINY_RCU
/*
* Print any non-default Tasks RCU settings.
*/
static void __init rcu_tasks_bootup_oddness(void)
{
#ifdef CONFIG_TASKS_RCU
if (rcu_task_stall_timeout != RCU_TASK_STALL_TIMEOUT)
pr_info("\tTasks-RCU CPU stall warnings timeout set to %d (rcu_task_stall_timeout).\n", rcu_task_stall_timeout);
else
pr_info("\tTasks RCU enabled.\n");
#endif /* #ifdef CONFIG_TASKS_RCU */
}
#endif /* #ifndef CONFIG_TINY_RCU */
#ifdef CONFIG_PROVE_RCU #ifdef CONFIG_PROVE_RCU
/* /*
@ -935,3 +953,25 @@ late_initcall(rcu_verify_early_boot_tests);
#else #else
void rcu_early_boot_tests(void) {} void rcu_early_boot_tests(void) {}
#endif /* CONFIG_PROVE_RCU */ #endif /* CONFIG_PROVE_RCU */
#ifndef CONFIG_TINY_RCU
/*
* Print any significant non-default boot-time settings.
*/
void __init rcupdate_announce_bootup_oddness(void)
{
if (rcu_normal)
pr_info("\tNo expedited grace period (rcu_normal).\n");
else if (rcu_normal_after_boot)
pr_info("\tNo expedited grace period (rcu_normal_after_boot).\n");
else if (rcu_expedited)
pr_info("\tAll grace periods are expedited (rcu_expedited).\n");
if (rcu_cpu_stall_suppress)
pr_info("\tRCU CPU stall warnings suppressed (rcu_cpu_stall_suppress).\n");
if (rcu_cpu_stall_timeout != CONFIG_RCU_CPU_STALL_TIMEOUT)
pr_info("\tRCU CPU stall warnings timeout set to %d (rcu_cpu_stall_timeout).\n", rcu_cpu_stall_timeout);
rcu_tasks_bootup_oddness();
}
#endif /* #ifndef CONFIG_TINY_RCU */