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rcu: Add rcu_barrier() statistics to debugfs tracing

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

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2012-05-25 11:49:15 -07:00 committed by Paul E. McKenney
parent a83eff0a82
commit d7e187c8e9
1 changed files with 39 additions and 0 deletions
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39
kernel/rcutree_trace.c
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@ -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)