perf_counter tools: Add 'perf list' to list available events

perf list: List all the available event types which can be used in
-e (--event) options.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/Documentation/perf_counter/perf.c b/Documentation/perf_counter/perf.c
index ec7edb7..9ac7565 100644
--- a/Documentation/perf_counter/perf.c
+++ b/Documentation/perf_counter/perf.c
@@ -258,6 +258,7 @@
 	const char *cmd = argv[0];
 	static struct cmd_struct commands[] = {
 		{ "help", cmd_help, 0 },
+		{ "list", cmd_list, 0 },
 		{ "record", cmd_record, 0 },
 		{ "report", cmd_report, 0 },
 		{ "stat", cmd_stat, 0 },