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| author | Adrian Hunter <adrian.hunter@intel.com> | 2013-11-01 14:51:29 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-11-04 16:18:17 +0100 |
| commit | f852fd621ca19f557f2e3d05900366be7c7afb83 (patch) | |
| tree | 23da3a0b5e20b418a2f549e9c0d7da1ea8481a6f | |
| parent | perf tools: Get current comm instead of last one (diff) | |
| download | linux-f852fd621ca19f557f2e3d05900366be7c7afb83.tar.xz linux-f852fd621ca19f557f2e3d05900366be7c7afb83.zip | |
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>
| -rw-r--r-- | tools/perf/util/evsel.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 3a334f001997..f0e65dec66a5 100644 --- 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; |