kernel/trace/trace_stat.c

31 /* A stat session is the stats output in one file */
40 /* All of the sessions currently in use. Each stat file embed one session */
47 static void __reset_stat_session(struct stat_session *session)
51 	rbtree_postorder_for_each_entry_safe(snode, n, &session->stat_root, node) {
52 		if (session->ts->stat_release)
53 			session->ts->stat_release(snode->stat);
57 	session->stat_root = RB_ROOT;
60 static void reset_stat_session(struct stat_session *session)
62 	mutex_lock(&session->stat_mutex);
63 	__reset_stat_session(session);
64 	mutex_unlock(&session->stat_mutex);
67 static void destroy_session(struct stat_session *session)
69 	tracefs_remove(session->file);
70 	__reset_stat_session(session);
71 	mutex_destroy(&session->stat_mutex);
72 	kfree(session);
123 static int stat_seq_init(struct stat_session *session)
125 	struct tracer_stat *ts = session->ts;
126 	struct rb_root *root = &session->stat_root;
131 	mutex_lock(&session->stat_mutex);
132 	__reset_stat_session(session);
161 	mutex_unlock(&session->stat_mutex);
165 	__reset_stat_session(session);
166 	mutex_unlock(&session->stat_mutex);
173 	struct stat_session *session = s->private;
179 	mutex_lock(&session->stat_mutex);
182 	if (session->ts->stat_headers) {
188 	node = rb_first(&session->stat_root);
197 	struct stat_session *session = s->private;
203 		return rb_first(&session->stat_root);
210 	struct stat_session *session = s->private;
211 	mutex_unlock(&session->stat_mutex);
216 	struct stat_session *session = s->private;
220 		return session->ts->stat_headers(s);
222 	return session->ts->stat_show(s, l->stat);
232 /* The session stat is refilled and resorted at each stat file opening */
237 	struct stat_session *session = inode->i_private;
243 	ret = stat_seq_init(session);
249 		reset_stat_session(session);
254 	m->private = session;
263 	struct stat_session *session = i->i_private;
265 	reset_stat_session(session);
293 static int init_stat_file(struct stat_session *session)
300 	session->file = tracefs_create_file(session->ts->name, TRACE_MODE_WRITE,
301 					    stat_dir, session,
303 	if (!session->file)
310 	struct stat_session *session, *node;
327 	/* Init the session */
328 	session = kzalloc(sizeof(*session), GFP_KERNEL);
329 	if (!session)
332 	session->ts = trace;
333 	INIT_LIST_HEAD(&session->session_list);
334 	mutex_init(&session->stat_mutex);
336 	ret = init_stat_file(session);
338 		destroy_session(session);
344 	list_add_tail(&session->session_list, &all_stat_sessions);