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Commit d7e187c8 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Paul E. McKenney
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rcu: Add rcu_barrier() statistics to debugfs tracing 



This commit adds an rcubarrier file to RCU's debugfs statistical tracing
directory, providing diagnostic information on rcu_barrier().

Signed-off-by: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
parent a83eff0a

kernel/rcutree_trace.c

+39 −0
Original line number Diff line number Diff line
@@ -46,6 +46,40 @@ 
#define RCU_TREE_NONCORE

#include "rcutree.h"



static void print_rcubarrier(struct seq_file *m, struct rcu_state *rsp)

{

	seq_printf(m, "%c bcc: %d nbd: %lu\n",

		   rsp->rcu_barrier_in_progress ? 'B' : '.',

		   atomic_read(&rsp->barrier_cpu_count),

		   rsp->n_barrier_done);

}



static int show_rcubarrier(struct seq_file *m, void *unused)

{

#ifdef CONFIG_TREE_PREEMPT_RCU

	seq_puts(m, "rcu_preempt: ");

	print_rcubarrier(m, &rcu_preempt_state);

#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */

	seq_puts(m, "rcu_sched: ");

	print_rcubarrier(m, &rcu_sched_state);

	seq_puts(m, "rcu_bh: ");

	print_rcubarrier(m, &rcu_bh_state);

	return 0;

}



static int rcubarrier_open(struct inode *inode, struct file *file)

{

	return single_open(file, show_rcubarrier, NULL);

}



static const struct file_operations rcubarrier_fops = {

	.owner = THIS_MODULE,

	.open = rcubarrier_open,

	.read = seq_read,

	.llseek = seq_lseek,

	.release = single_release,

};



#ifdef CONFIG_RCU_BOOST



static char convert_kthread_status(unsigned int kthread_status)
@@ -453,6 +487,11 @@ static int __init rcutree_trace_init(void) 
	if (!rcudir)

		goto free_out;



	retval = debugfs_create_file("rcubarrier", 0444, rcudir,

						NULL, &rcubarrier_fops);

	if (!retval)

		goto free_out;



	retval = debugfs_create_file("rcudata", 0444, rcudir,

						NULL, &rcudata_fops);

	if (!retval)