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>

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 8a9c6908f54ed658f4d1f548796cde72413ddf29..af5db885ea9c700f59b434ad2c942c8b79c1083f 100644 (file)
--- 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);