perf session: Warn when AUX data has been lost

By default 'perf record' will postprocess the perf.data file to
determine build-ids.  When that happens, the number of lost perf events
is displayed.

Make that also happen for AUX events.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1443186956-18718-7-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 11 insertions, 0 deletions

diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index be5cbc7be889..a0dbcbd4f6d8 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -257,6 +257,7 @@ struct events_stats {
         u64 total_non_filtered_period;
         u64 total_lost;
         u64 total_lost_samples;
+        u64 total_aux_lost;
         u64 total_invalid_chains;
         u32 nr_events[PERF_RECORD_HEADER_MAX];
         u32 nr_non_filtered_samples;
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index f5e000030a5e..15c84cad213a 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1101,6 +1101,9 @@ static int machines__deliver_event(struct machines *machines,
         case PERF_RECORD_UNTHROTTLE:
                 return tool->unthrottle(tool, event, sample, machine);
         case PERF_RECORD_AUX:
+                if (tool->aux == perf_event__process_aux &&
+                    (event->aux.flags & PERF_AUX_FLAG_TRUNCATED))
+                        evlist->stats.total_aux_lost += 1;
                 return tool->aux(tool, event, sample, machine);
         case PERF_RECORD_ITRACE_START:
                 return tool->itrace_start(tool, event, sample, machine);
@@ -1346,6 +1349,13 @@ static void perf_session__warn_about_errors(const struct perf_session *session)
                 }
         }
 
+        if (session->tool->aux == perf_event__process_aux &&
+            stats->total_aux_lost != 0) {
+                ui__warning("AUX data lost %" PRIu64 " times out of %u!\n\n",
+                            stats->total_aux_lost,
+                            stats->nr_events[PERF_RECORD_AUX]);
+        }
+
         if (stats->nr_unknown_events != 0) {
                 ui__warning("Found %u unknown events!\n\n"
                             "Is this an older tool processing a perf.data "