perf report: Show error message when processing sample fails

Currently when perf fails to process samples for some reason, it doesn't
show any message about the failure.  This is very inconvenient for users
especially on TUI as screen is reset after the failure.

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1448645559-31167-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 9 insertions, 3 deletions

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 8a9c6908f54e..af5db885ea9c 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -513,20 +513,26 @@ static int __cmd_report(struct report *rep)
         if (rep->cpu_list) {
                 ret = perf_session__cpu_bitmap(session, rep->cpu_list,
                                                rep->cpu_bitmap);
-                if (ret)
+                if (ret) {
+                        ui__error("failed to set cpu bitmap\n");
                         return ret;
+                }
         }
 
         if (rep->show_threads)
                 perf_read_values_init(&rep->show_threads_values);
 
         ret = report__setup_sample_type(rep);
-        if (ret)
+        if (ret) {
+                /* report__setup_sample_type() already showed error message */
                 return ret;
+        }
 
         ret = perf_session__process_events(session);
-        if (ret)
+        if (ret) {
+                ui__error("failed to process sample\n");
                 return ret;
+        }
 
         report__warn_kptr_restrict(rep);