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

[tip-bot for Arnaldo Carvalho de Melo]

Commit-ID:  74cfc17dc1a69c37ce6c8a76c1ce84bcb796eb0e
Gitweb:     http://git.kernel.org/tip/74cfc17dc1a69c37ce6c8a76c1ce84bcb796eb0e
Author:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Thu, 17 Feb 2011 14:40:46 -0200
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 17 Feb 2011 14:40:46 -0200

perf report: Tell the user when a perf.data file has no samples

[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;
 
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