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-rw-r--r--tools/perf/util/parse-events.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index d248fca6d7ed..1e15df10a88c 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1091,12 +1091,12 @@ int is_valid_tracepoint(const char *event_string)
1091static bool is_event_supported(u8 type, unsigned config) 1091static bool is_event_supported(u8 type, unsigned config)
1092{ 1092{
1093 bool ret = true; 1093 bool ret = true;
1094 int open_return;
1094 struct perf_evsel *evsel; 1095 struct perf_evsel *evsel;
1095 struct perf_event_attr attr = { 1096 struct perf_event_attr attr = {
1096 .type = type, 1097 .type = type,
1097 .config = config, 1098 .config = config,
1098 .disabled = 1, 1099 .disabled = 1,
1099 .exclude_kernel = 1,
1100 }; 1100 };
1101 struct { 1101 struct {
1102 struct thread_map map; 1102 struct thread_map map;
@@ -1108,7 +1108,20 @@ static bool is_event_supported(u8 type, unsigned config)
1108 1108
1109 evsel = perf_evsel__new(&attr); 1109 evsel = perf_evsel__new(&attr);
1110 if (evsel) { 1110 if (evsel) {
1111 ret = perf_evsel__open(evsel, NULL, &tmap.map) >= 0; 1111 open_return = perf_evsel__open(evsel, NULL, &tmap.map);
1112 ret = open_return >= 0;
1113
1114 if (open_return == -EACCES) {
1115 /*
1116 * This happens if the paranoid value
1117 * /proc/sys/kernel/perf_event_paranoid is set to 2
1118 * Re-run with exclude_kernel set; we don't do that
1119 * by default as some ARM machines do not support it.
1120 *
1121 */
1122 evsel->attr.exclude_kernel = 1;
1123 ret = perf_evsel__open(evsel, NULL, &tmap.map) >= 0;
1124 }
1112 perf_evsel__delete(evsel); 1125 perf_evsel__delete(evsel);
1113 } 1126 }
1114 1127