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, 29 insertions, 17 deletions

diff --git a/Documentation/perf_counter/util/parse-events.c b/Documentation/perf_counter/util/parse-events.c
index de9a77c47151..150fbd262714 100644
--- a/Documentation/perf_counter/util/parse-events.c
+++ b/Documentation/perf_counter/util/parse-events.c
@@ -274,31 +274,43 @@ again:
         return 0;
 }
 
+static const char * const event_type_descriptors[] = {
+        "",
+        "Hardware event",
+        "Software event",
+        "Tracepoint event",
+        "Hardware cache event",
+};
+
 /*
- * Create the help text for the event symbols:
+ * Print the help text for the event symbols:
  */
-void create_events_help(char *events_help_msg)
+void print_events(void)
 {
-        unsigned int i;
-        char *str;
+        struct event_symbol *syms = event_symbols;
+        unsigned int i, type, prev_type = -1;
 
-        str = events_help_msg;
+        fprintf(stderr, "\n");
+        fprintf(stderr, "List of pre-defined events (to be used in -e):\n");
 
-        str += sprintf(str,
-        "event name: [");
+        for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
+                type = syms->type + 1;
+                if (type > ARRAY_SIZE(event_type_descriptors))
+                        type = 0;
 
-        for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
-                int type, id;
-
-                type = event_symbols[i].type;
-                id = event_symbols[i].config;
+                if (type != prev_type)
+                        fprintf(stderr, "\n");
 
-                if (i)
-                        str += sprintf(str, "|");
+                fprintf(stderr, "  %-30s [%s]\n", syms->symbol,
+                        event_type_descriptors[type]);
 
-                str += sprintf(str, "%s",
-                                event_symbols[i].symbol);
+                prev_type = type;
         }
 
-        str += sprintf(str, "|rNNN]");
+        fprintf(stderr, "\n");
+        fprintf(stderr, "  %-30s [raw hardware event descriptor]\n",
+                "rNNN");
+        fprintf(stderr, "\n");
+
+        exit(129);
 }