perf evlist: New command to list the names of events present in a perf.data file

[root@emilia ~]# perf record -a -e sched:* -e timer:timer* sleep 5
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.172 MB perf.data (~7530 samples) ]
[root@emilia ~]# perf evlist
sched:sched_kthread_stop
sched:sched_kthread_stop_ret
sched:sched_wakeup
sched:sched_wakeup_new
sched:sched_switch
sched:sched_migrate_task
sched:sched_process_free
sched:sched_process_exit
sched:sched_wait_task
sched:sched_process_wait
sched:sched_process_fork
sched:sched_stat_wait
sched:sched_stat_sleep
sched:sched_stat_iowait
sched:sched_stat_runtime
sched:sched_pi_setprio
timer:timer_init
timer:timer_start
timer:timer_expire_entry
timer:timer_expire_exit
timer:timer_cancel
[root@emilia ~]#

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

6 files changed, 84 insertions, 0 deletions

diff --git a/tools/perf/Documentation/perf-evlist.txt b/tools/perf/Documentation/perf-evlist.txt
new file mode 100644
index 000000000000..0cada9e053dc
--- /dev/null
+++ b/tools/perf/Documentation/perf-evlist.txt
@@ -0,0 +1,26 @@
+perf-evlist(1)
+==============
+
+NAME
+----
+perf-evlist - List the event names in a perf.data file
+
+SYNOPSIS
+--------
+[verse]
+'perf evlist <options>'
+
+DESCRIPTION
+-----------
+This command displays the names of events sampled in a perf.data file.
+
+OPTIONS
+-------
+-i::
+--input=::
+        Input file name. (default: perf.data)
+
+SEE ALSO
+--------
+linkperf:perf-record[1], linkperf:perf-list[1],
+linkperf:perf-report[1]
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 9b8421805c5c..158c30e8210c 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -338,6 +338,7 @@ endif
 BUILTIN_OBJS += $(OUTPUT)bench/mem-memcpy.o
 
 BUILTIN_OBJS += $(OUTPUT)builtin-diff.o
+BUILTIN_OBJS += $(OUTPUT)builtin-evlist.o
 BUILTIN_OBJS += $(OUTPUT)builtin-help.o
 BUILTIN_OBJS += $(OUTPUT)builtin-sched.o
 BUILTIN_OBJS += $(OUTPUT)builtin-buildid-list.o
diff --git a/tools/perf/builtin-evlist.c b/tools/perf/builtin-evlist.c
new file mode 100644
index 000000000000..4c5e9e04a41f
--- /dev/null
+++ b/tools/perf/builtin-evlist.c
@@ -0,0 +1,54 @@
+/*
+ * Builtin evlist command: Show the list of event selectors present
+ * in a perf.data file.
+ */
+#include "builtin.h"
+
+#include "util/util.h"
+
+#include <linux/list.h>
+
+#include "perf.h"
+#include "util/evlist.h"
+#include "util/evsel.h"
+#include "util/parse-events.h"
+#include "util/parse-options.h"
+#include "util/session.h"
+
+static char const *input_name = "perf.data";
+
+static int __cmd_evlist(void)
+{
+        struct perf_session *session;
+        struct perf_evsel *pos;
+
+        session = perf_session__new(input_name, O_RDONLY, 0, false, NULL);
+        if (session == NULL)
+                return -ENOMEM;
+
+        list_for_each_entry(pos, &session->evlist->entries, node)
+                printf("%s\n", event_name(pos));
+
+        perf_session__delete(session);
+        return 0;
+}
+
+static const char * const evlist_usage[] = {
+        "perf evlist [<options>]",
+        NULL
+};
+
+static const struct option options[] = {
+        OPT_STRING('i', "input", &input_name, "file",
+                    "input file name"),
+        OPT_END()
+};
+
+int cmd_evlist(int argc, const char **argv, const char *prefix __used)
+{
+        argc = parse_options(argc, argv, options, evlist_usage, 0);
+        if (argc)
+                usage_with_options(evlist_usage, options);
+
+        return __cmd_evlist();
+}
diff --git a/tools/perf/builtin.h b/tools/perf/builtin.h
index c7798c7f24ed..4702e2443a8e 100644
--- a/tools/perf/builtin.h
+++ b/tools/perf/builtin.h
@@ -19,6 +19,7 @@ extern int cmd_bench(int argc, const char **argv, const char *prefix);
 extern int cmd_buildid_cache(int argc, const char **argv, const char *prefix);
 extern int cmd_buildid_list(int argc, const char **argv, const char *prefix);
 extern int cmd_diff(int argc, const char **argv, const char *prefix);
+extern int cmd_evlist(int argc, const char **argv, const char *prefix);
 extern int cmd_help(int argc, const char **argv, const char *prefix);
 extern int cmd_sched(int argc, const char **argv, const char *prefix);
 extern int cmd_list(int argc, const char **argv, const char *prefix);
diff --git a/tools/perf/command-list.txt b/tools/perf/command-list.txt
index 16b5088cf8f4..d695fe40fbff 100644
--- a/tools/perf/command-list.txt
+++ b/tools/perf/command-list.txt
@@ -8,6 +8,7 @@ perf-bench			mainporcelain common
 perf-buildid-cache              mainporcelain common
 perf-buildid-list               mainporcelain common
 perf-diff                       mainporcelain common
+perf-evlist                     mainporcelain common
 perf-inject                     mainporcelain common
 perf-list                       mainporcelain common
 perf-sched                      mainporcelain common
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 595d0f4a7103..ec635b7cc8ea 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -313,6 +313,7 @@ static void handle_internal_command(int argc, const char **argv)
                 { "buildid-cache", cmd_buildid_cache, 0 },
                 { "buildid-list", cmd_buildid_list, 0 },
                 { "diff",       cmd_diff,       0 },
+                { "evlist",     cmd_evlist,     0 },
                 { "help",       cmd_help,       0 },
                 { "list",       cmd_list,       0 },
                 { "record",     cmd_record,     0 },