There is a debug print (at verbose level 2) for each
call to perf_event_open. Add another debug print if
the call fails, and print the error number.
Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
---
tools/perf/util/evsel.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 291b18a..1bb4f19 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1052,6 +1052,8 @@ retry_open:
group_fd,
flags);
if (FD(evsel, cpu, thread) < 0) {
err = -errno;
+ pr_debug2("perf_event_open failed, error %d\n",
+ err);
goto try_fallback;
}
set_rlimit = NO_CHANGE;
--
1.7.11.7
--
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