[PATCH 4.8 60/92] perf top: Fix refreshing hierarchy entries on TUI

[Greg Kroah-Hartman]

4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Namhyung Kim <namhyung@xxxxxxxxxx>

commit c611152373e84a7677cd7d496e849de4debdab66 upstream.

Markus reported that 'perf top --hierarchy' cannot scroll down after
refresh.  This was because the number of entries are not updated when
hierarchy is enabled.

Unlike normal report view, hierarchy mode needs to keep its own entry
count since it can have non-leaf entries which can expand/collapse.

Reported-and-Tested-by: Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx>
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Tested-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Fixes: f5b763feebe9 ("perf hists browser: Count number of hierarchy entries")
Link: http://lkml.kernel.org/r/20161007050412.3000-1-namhyung@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 tools/perf/ui/browsers/hists.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -595,7 +595,8 @@ int hist_browser__run(struct hist_browse
 			u64 nr_entries;
 			hbt->timer(hbt->arg);
 
-			if (hist_browser__has_filter(browser))
+			if (hist_browser__has_filter(browser) ||
+			    symbol_conf.report_hierarchy)
 				hist_browser__update_nr_entries(browser);
 
 			nr_entries = hist_browser__nr_entries(browser);