perf evsel: Add a debug print if perf_event_open fails

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.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.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 <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1383313899-15987-2-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 3a334f0019979e88ed8fbaa152f2183470c973f5..f0e65dec66a512a79b4a7b5ebbc1443fd28344c4 100644 (file)
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1051,6 +1051,8 @@ 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;