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Commit d8ea37d5 authored by Lai Jiangshan's avatar Lai Jiangshan Committed by Ingo Molnar
Browse files

tracing/stat: Add stat_release() callback 



Add stat_release() callback to struct tracer_stat, so a stat tracer
can release it's entries after the stat file has been read out.

Signed-off-by: default avatarLai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4A51B16A.6020708@cn.fujitsu.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 80098c20

kernel/trace/trace_stat.c

+5 −2
Original line number Diff line number Diff line
@@ -49,7 +49,8 @@ static struct dentry *stat_dir; 
 * but it will at least advance closer to the next one

 * to be released.

 */

static struct rb_node *release_next(struct rb_node *node)

static struct rb_node *release_next(struct tracer_stat *ts,

				    struct rb_node *node)

{

	struct stat_node *snode;

	struct rb_node *parent = rb_parent(node);
@@ -67,6 +68,8 @@ static struct rb_node *release_next(struct rb_node *node) 
			parent->rb_right = NULL;



		snode = container_of(node, struct stat_node, node);

		if (ts->stat_release)

			ts->stat_release(snode->stat);

		kfree(snode);



		return parent;
@@ -78,7 +81,7 @@ static void reset_stat_session(struct stat_session *session) 
	struct rb_node *node = session->stat_root.rb_node;



	while (node)

		node = release_next(node);

		node = release_next(session->ts, node);



	session->stat_root = RB_ROOT;

}

kernel/trace/trace_stat.h

+2 −0
Original line number Diff line number Diff line
@@ -18,6 +18,8 @@ struct tracer_stat { 
	int			(*stat_cmp)(void *p1, void *p2);

	/* Print a stat entry */

	int			(*stat_show)(struct seq_file *s, void *p);

	/* Release an entry */

	void			(*stat_release)(void *stat);

	/* Print the headers of your stat entries */

	int			(*stat_headers)(struct seq_file *s);

};