perf report TUI: Remove needless 'dummy' event from menu

Fixing the common case of:

  perf record
  perf report

And getting just the cycles events.

We now have a 'dummy' event to get perf metadata events that take place
while we synthesize metadata records for pre-existing processes by
traversing procfs, so we always have this extra 'dummy' evsel, but we
don't have to offer it as there will be no samples on it, remove this
distraction.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/lkml/20200706115452.GA2772@redhat.com/Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/ui/browsers/hists.c

@@ -3603,6 +3603,23 @@ static int __perf_evlist__tui_browse_hists(struct evlist *evlist,
 				    hbt, warn_lost_event);
 }
 
+static bool perf_evlist__single_entry(struct evlist *evlist)
+{
+	int nr_entries = evlist->core.nr_entries;
+
+	if (nr_entries == 1)
+	       return true;
+
+	if (nr_entries == 2) {
+		struct evsel *last = evlist__last(evlist);
+
+		if (evsel__is_dummy_event(last))
+			return true;
+	}
+
+	return false;
+}
+
 int perf_evlist__tui_browse_hists(struct evlist *evlist, const char *help,
 				  struct hist_browser_timer *hbt,
 				  float min_pcnt,
@@ -3613,7 +3630,7 @@ int perf_evlist__tui_browse_hists(struct evlist *evlist, const char *help,
 	int nr_entries = evlist->core.nr_entries;
 
 single_entry:
-	if (nr_entries == 1) {
+	if (perf_evlist__single_entry(evlist)) {
 		struct evsel *first = evlist__first(evlist);
 
 		return perf_evsel__hists_browse(first, nr_entries, help,