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-rw-r--r--tools/perf/util/pfm.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/tools/perf/util/pfm.c b/tools/perf/util/pfm.c
index 862e4a6898..5ccfe4b64c 100644
--- a/tools/perf/util/pfm.c
+++ b/tools/perf/util/pfm.c
@@ -145,7 +145,20 @@ static bool is_libpfm_event_supported(const char *name, struct perf_cpu_map *cpu
evsel->is_libpfm_event = true;
- if (evsel__open(evsel, cpus, threads) < 0)
+ ret = evsel__open(evsel, cpus, threads);
+ if (ret == -EACCES) {
+ /*
+ * This happens if the paranoid value
+ * /proc/sys/kernel/perf_event_paranoid is set to 2
+ * Re-run with exclude_kernel set; we don't do that
+ * by default as some ARM machines do not support it.
+ *
+ */
+ evsel->core.attr.exclude_kernel = 1;
+ ret = evsel__open(evsel, cpus, threads);
+
+ }
+ if (ret < 0)
result = false;
evsel__close(evsel);