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>

1 files changed, 2 insertions, 5 deletions

diff --git a/Documentation/perf_counter/builtin-top.c b/Documentation/perf_counter/builtin-top.c
index 98a6d53e17b3..f2e7312f85c9 100644
--- a/Documentation/perf_counter/builtin-top.c
+++ b/Documentation/perf_counter/builtin-top.c
@@ -606,11 +606,10 @@ static const char * const top_usage[] = {
         NULL
 };
 
-static char events_help_msg[EVENTS_HELP_MAX];
-
 static const struct option options[] = {
         OPT_CALLBACK('e', "event", NULL, "event",
-                     events_help_msg, parse_events),
+                     "event selector. use 'perf list' to list available events",
+                     parse_events),
         OPT_INTEGER('c', "count", &default_interval,
                     "event period to sample"),
         OPT_INTEGER('p', "pid", &target_pid,
@@ -648,8 +647,6 @@ int cmd_top(int argc, const char **argv, const char *prefix)
 
         page_size = sysconf(_SC_PAGE_SIZE);
 
-        create_events_help(events_help_msg);
-
         argc = parse_options(argc, argv, options, top_usage, 0);
         if (argc)
                 usage_with_options(top_usage, options);