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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>
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@ -1051,6 +1051,8 @@ retry_open:
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group_fd, flags);
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if (FD(evsel, cpu, thread) < 0) {
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err = -errno;
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pr_debug2("perf_event_open failed, error %d\n",
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err);
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goto try_fallback;
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}
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set_rlimit = NO_CHANGE;
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