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@elte.hu> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -350,6 +350,12 @@ static int __cmd_report(void)
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perf_session__fprintf_dsos(session, stdout);
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next = rb_first(&session->hists_tree);
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if (next == NULL) {
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ui__warning("The %s file has no samples!\n", input_name);
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goto out_delete;
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}
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while (next) {
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struct hists *hists;
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