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Commit 59d80fd8 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

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: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent f4687d26

include/linux/rcupdate.h

+1 −0
Original line number Diff line number Diff line
@@ -76,6 +76,7 @@ bool rcu_gp_is_normal(void); /* Internal RCU use. */ 
bool rcu_gp_is_expedited(void);  /* Internal RCU use. */

void rcu_expedite_gp(void);

void rcu_unexpedite_gp(void);

void rcupdate_announce_bootup_oddness(void);

#endif /* #else #ifdef CONFIG_TINY_RCU */



enum rcutorture_type {

kernel/rcu/tree_plugin.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

	if (IS_ENABLED(CONFIG_RCU_BOOST))

		pr_info("\tRCU kthread priority: %d.\n", kthread_prio);

	rcupdate_announce_bootup_oddness();

}



#ifdef CONFIG_PREEMPT_RCU

kernel/rcu/update.c

+41 −1
Original line number Diff line number Diff line
@@ -560,7 +560,8 @@ static DEFINE_RAW_SPINLOCK(rcu_tasks_cbs_lock); 
DEFINE_SRCU(tasks_rcu_exit_srcu);



/* 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);



static void rcu_spawn_tasks_kthread(void);
@@ -851,6 +852,23 @@ static void rcu_spawn_tasks_kthread(void) 


#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



/*
@@ -935,3 +953,25 @@ late_initcall(rcu_verify_early_boot_tests); 
#else

void rcu_early_boot_tests(void) {}

#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 */