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Commit 647bcd03 authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt
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ftrace: Add enabled_functions file 



Add the enabled_functions file that is used to show all the
functions that have been enabled for tracing as well as their
ref counts. This helps seeing if any function has been registered
and what functions are being traced.

Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent ed926f9b

kernel/trace/ftrace.c

+49 −2
Original line number Diff line number Diff line
@@ -1703,6 +1703,7 @@ enum { 
	FTRACE_ITER_NOTRACE	= (1 << 1),

	FTRACE_ITER_PRINTALL	= (1 << 2),

	FTRACE_ITER_HASH	= (1 << 3),

	FTRACE_ITER_ENABLED	= (1 << 4),

};



#define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */
@@ -1842,7 +1843,11 @@ t_next(struct seq_file *m, void *v, loff_t *pos) 
		     !(ftrace_lookup_ip(ops->filter_hash, rec->ip))) ||



		    ((iter->flags & FTRACE_ITER_NOTRACE) &&

		     !ftrace_lookup_ip(ops->notrace_hash, rec->ip))) {

		     !ftrace_lookup_ip(ops->notrace_hash, rec->ip)) ||



		    ((iter->flags & FTRACE_ITER_ENABLED) &&

		     !(rec->flags & ~FTRACE_FL_MASK))) {



			rec = NULL;

			goto retry;

		}
@@ -1944,7 +1949,11 @@ static int t_show(struct seq_file *m, void *v) 
	if (!rec)

		return 0;



	seq_printf(m, "%ps\n", (void *)rec->ip);

	seq_printf(m, "%ps", (void *)rec->ip);

	if (iter->flags & FTRACE_ITER_ENABLED)

		seq_printf(m, " (%ld)",

			   rec->flags & ~FTRACE_FL_MASK);

	seq_printf(m, "\n");



	return 0;

}
@@ -1983,6 +1992,34 @@ ftrace_avail_open(struct inode *inode, struct file *file) 
	return ret;

}



static int

ftrace_enabled_open(struct inode *inode, struct file *file)

{

	struct ftrace_iterator *iter;

	int ret;



	if (unlikely(ftrace_disabled))

		return -ENODEV;



	iter = kzalloc(sizeof(*iter), GFP_KERNEL);

	if (!iter)

		return -ENOMEM;



	iter->pg = ftrace_pages_start;

	iter->flags = FTRACE_ITER_ENABLED;



	ret = seq_open(file, &show_ftrace_seq_ops);

	if (!ret) {

		struct seq_file *m = file->private_data;



		m->private = iter;

	} else {

		kfree(iter);

	}



	return ret;

}



static void ftrace_filter_reset(struct ftrace_hash *hash)

{

	mutex_lock(&ftrace_lock);
@@ -2838,6 +2875,13 @@ static const struct file_operations ftrace_avail_fops = { 
	.release = seq_release_private,

};



static const struct file_operations ftrace_enabled_fops = {

	.open = ftrace_enabled_open,

	.read = seq_read,

	.llseek = seq_lseek,

	.release = seq_release_private,

};



static const struct file_operations ftrace_filter_fops = {

	.open = ftrace_filter_open,

	.read = seq_read,
@@ -3069,6 +3113,9 @@ static __init int ftrace_init_dyn_debugfs(struct dentry *d_tracer) 
	trace_create_file("available_filter_functions", 0444,

			d_tracer, NULL, &ftrace_avail_fops);



	trace_create_file("enabled_functions", 0444,

			d_tracer, NULL, &ftrace_enabled_fops);



	trace_create_file("set_ftrace_filter", 0644, d_tracer,

			NULL, &ftrace_filter_fops);