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rcu: Add tracing for synchronize_sched_expedited() 

This commit adds a per-RCU-flavor "rcuexp" file that dumps out
statistics for synchonize_sched_expedited().

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2012-10-11 17:14:32 -07:00 committed by Paul E. McKenney
parent 6ee0886ff6
commit 7bd8f2a74b
1 changed files with 37 additions and 0 deletions
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37
kernel/rcutree_trace.c
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@ -173,6 +173,38 @@ static const struct file_operations rcudata_fops = {
.release = seq_release,
};
static int show_rcuexp(struct seq_file *m, void *v)
{
struct rcu_state *rsp = (struct rcu_state *)m->private;
seq_printf(m, "s=%lu d=%lu w=%lu tf=%lu wd1=%lu wd2=%lu n=%lu sc=%lu dt=%lu dl=%lu dx=%lu\n",
atomic_long_read(&rsp->expedited_start),
atomic_long_read(&rsp->expedited_done),
atomic_long_read(&rsp->expedited_wrap),
atomic_long_read(&rsp->expedited_tryfail),
atomic_long_read(&rsp->expedited_workdone1),
atomic_long_read(&rsp->expedited_workdone2),
atomic_long_read(&rsp->expedited_normal),
atomic_long_read(&rsp->expedited_stoppedcpus),
atomic_long_read(&rsp->expedited_done_tries),
atomic_long_read(&rsp->expedited_done_lost),
atomic_long_read(&rsp->expedited_done_exit));
return 0;
}
static int rcuexp_open(struct inode *inode, struct file *file)
{
return single_open(file, show_rcuexp, inode->i_private);
}
static const struct file_operations rcuexp_fops = {
.owner = THIS_MODULE,
.open = rcuexp_open,
.read = seq_read,
.llseek = no_llseek,
.release = seq_release,
};
#ifdef CONFIG_RCU_BOOST
static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp)
@ -405,6 +437,11 @@ static int __init rcutree_trace_init(void)
if (!retval)
goto free_out;
retval = debugfs_create_file("rcuexp", 0444,
rspdir, rsp, &rcuexp_fops);
if (!retval)
goto free_out;
retval = debugfs_create_file("rcu_pending", 0444,
rspdir, rsp, &rcu_pending_fops);
if (!retval)