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>

9 files changed, 61 insertions, 34 deletions

diff --git a/Documentation/perf_counter/Makefile b/Documentation/perf_counter/Makefile
index 5b99f04df812..32c0bb21a328 100644
--- a/Documentation/perf_counter/Makefile
+++ b/Documentation/perf_counter/Makefile
@@ -328,6 +328,7 @@ BUILTIN_OBJS += builtin-record.o
 BUILTIN_OBJS += builtin-report.o
 BUILTIN_OBJS += builtin-stat.o
 BUILTIN_OBJS += builtin-top.o
+BUILTIN_OBJS += builtin-list.o
 
 PERFLIBS = $(LIB_FILE)
 EXTLIBS =
diff --git a/Documentation/perf_counter/builtin-list.c b/Documentation/perf_counter/builtin-list.c
new file mode 100644
index 000000000000..fe60e37c96ef
--- /dev/null
+++ b/Documentation/perf_counter/builtin-list.c
@@ -0,0 +1,20 @@
+/*
+ * builtin-list.c
+ *
+ * Builtin list command: list all event types
+ *
+ * Copyright (C) 2009, Thomas Gleixner <tglx@linutronix.de>
+ * Copyright (C) 2008-2009, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
+ */
+#include "builtin.h"
+
+#include "perf.h"
+
+#include "util/parse-options.h"
+#include "util/parse-events.h"
+
+int cmd_list(int argc, const char **argv, const char *prefix)
+{
+        print_events();
+        return 0;
+}
diff --git a/Documentation/perf_counter/builtin-record.c b/Documentation/perf_counter/builtin-record.c
index 130fd88266bb..aeab9c4b15e4 100644
--- a/Documentation/perf_counter/builtin-record.c
+++ b/Documentation/perf_counter/builtin-record.c
@@ -495,11 +495,10 @@ static const char * const record_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('p', "pid", &target_pid,
                     "record events on existing pid"),
         OPT_INTEGER('r', "realtime", &realtime_prio,
@@ -527,8 +526,6 @@ int cmd_record(int argc, const char **argv, const char *prefix)
 {
         int counter;
 
-        create_events_help(events_help_msg);
-
         argc = parse_options(argc, argv, options, record_usage, 0);
         if (!argc && target_pid == -1 && !system_wide)
                 usage_with_options(record_usage, options);
diff --git a/Documentation/perf_counter/builtin-stat.c b/Documentation/perf_counter/builtin-stat.c
index 9711e5524233..2cbf5a189589 100644
--- a/Documentation/perf_counter/builtin-stat.c
+++ b/Documentation/perf_counter/builtin-stat.c
@@ -293,18 +293,17 @@ static const char * const stat_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_BOOLEAN('i', "inherit", &inherit,
                     "child tasks inherit counters"),
         OPT_INTEGER('p', "pid", &target_pid,
                     "stat events on existing pid"),
         OPT_BOOLEAN('a', "all-cpus", &system_wide,
                             "system-wide collection from all CPUs"),
-        OPT_BOOLEAN('l', "scale", &scale,
+        OPT_BOOLEAN('S', "scale", &scale,
                             "scale/normalize counters"),
         OPT_END()
 };
@@ -313,8 +312,6 @@ int cmd_stat(int argc, const char **argv, const char *prefix)
 {
         page_size = sysconf(_SC_PAGE_SIZE);
 
-        create_events_help(events_help_msg);
-
         memcpy(attrs, default_attrs, sizeof(attrs));
 
         argc = parse_options(argc, argv, options, stat_usage, 0);
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);
diff --git a/Documentation/perf_counter/builtin.h b/Documentation/perf_counter/builtin.h
index 5bfea57d33fe..e7de47da8581 100644
--- a/Documentation/perf_counter/builtin.h
+++ b/Documentation/perf_counter/builtin.h
@@ -20,4 +20,6 @@ extern int cmd_report(int argc, const char **argv, const char *prefix);
 extern int cmd_stat(int argc, const char **argv, const char *prefix);
 extern int cmd_top(int argc, const char **argv, const char *prefix);
 extern int cmd_version(int argc, const char **argv, const char *prefix);
+extern int cmd_list(int argc, const char **argv, const char *prefix);
+
 #endif
diff --git a/Documentation/perf_counter/perf.c b/Documentation/perf_counter/perf.c
index ec7edb7fbe29..9ac75657a180 100644
--- a/Documentation/perf_counter/perf.c
+++ b/Documentation/perf_counter/perf.c
@@ -258,6 +258,7 @@ static void handle_internal_command(int argc, const char **argv)
         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 },
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);
 }
diff --git a/Documentation/perf_counter/util/parse-events.h b/Documentation/perf_counter/util/parse-events.h
index 542971c495bd..e3d552908e60 100644
--- a/Documentation/perf_counter/util/parse-events.h
+++ b/Documentation/perf_counter/util/parse-events.h
@@ -13,5 +13,5 @@ extern int parse_events(const struct option *opt, const char *str, int unset);
 
 #define EVENTS_HELP_MAX (128*1024)
 
-extern void create_events_help(char *help_msg);
+extern void print_events(void);