perf test: Add round trip test for sw and hw event names

It basically traverses the hardware and software event name arrays
creating an evlist with all events, then it uses perf_evsel__name to
check that the name is the expected one.

With it I noticed this problem:

[root@sandy ~]# perf test 10
10: roundtrip evsel->name check:invalid or unsupported event: 'CPU-migrations'
Run 'perf list' for a list of valid events
 FAILED!

Changed it to "cpu-migrations" in the software event arrays and it
worked.

This is to catch problems like the one reported by Joel Uckelman in
http://permalink.gmane.org/gmane.linux.kernel.perf.user/1016

Hardware cache events will be checked in the following patch.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-5jskfkuqvf2fi257zmni0ftz@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 7 insertions, 5 deletions

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 7ff3c8fb736c..06f76441547a 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -68,7 +68,7 @@ struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx)
         return evsel;
 }
 
-static const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
+const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
         "cycles",
         "instructions",
         "cache-references",
@@ -131,12 +131,12 @@ static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
         return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
 }
 
-static const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
+const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
         "cpu-clock",
         "task-clock",
         "page-faults",
         "context-switches",
-        "CPU-migrations",
+        "cpu-migrations",
         "minor-faults",
         "major-faults",
         "alignment-faults",
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 94f6ba16747f..a3f562cec433 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -97,8 +97,10 @@ extern const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
                                        [PERF_EVSEL__MAX_ALIASES];
 extern const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
                                           [PERF_EVSEL__MAX_ALIASES];
-const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
-                                       [PERF_EVSEL__MAX_ALIASES];
+extern const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
+                                              [PERF_EVSEL__MAX_ALIASES];
+extern const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX];
+extern const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX];
 int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
                                             char *bf, size_t size);
 const char *perf_evsel__name(struct perf_evsel *evsel);