[PATCH 5/5] perf report: Tell the user when a perf.data file has no samples

[Arnaldo Carvalho de Melo]

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

[root@emilia ~]# perf report --stdio
The perf.data file has no samples!
[root@emilia ~]#

The TUI shows a popup warning message with the same message.

Reported-by: Ingo Molnar <mingo@xxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Tom Zanussi <tzanussi@xxxxxxxxx>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/builtin-report.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index f9a99a1..dddcc7e 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -350,6 +350,12 @@ static int __cmd_report(void)
 		perf_session__fprintf_dsos(session, stdout);
 
 	next = rb_first(&session->hists_tree);
+
+	if (next == NULL) {
+		ui__warning("The %s file has no samples!\n", input_name);
+		goto out_delete;
+	}
+
 	while (next) {
 		struct hists *hists;
 
-- 
1.6.2.5

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