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Commit 7bd8f2a7 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Paul E. McKenney
Browse files

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: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 6ee0886f

kernel/rcutree_trace.c

+37 −0
Original line number Diff line number Diff line
@@ -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)