linux-kernel - Re: Scrolling down broken with "perf top --hierarchy"

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Date:   Fri, 7 Oct 2016 10:17:53 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Markus Trippelsdorf <markus@...ppelsdorf.de>
CC:     <linux-kernel@...r.kernel.org>
Subject: Re: Scrolling down broken with "perf top --hierarchy"

Hi Markus,

On Thu, Oct 06, 2016 at 06:33:33PM +0200, Markus Trippelsdorf wrote:
> Scrolling down is broken when using "perf top --hierarchy".
> When it starts up everything is OK and one can scroll up and down to all
> entries. But as further and further new entries get added to the list,
> scrolling down is blocked (at the position of the last entry that was
> shown directly after startup).

I think below patch will fix the problem.  Please check.



>From 38ef0f20e6b787fcdab265307ac679cfac6dd0ff Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung@...nel.org>
Date: Fri, 7 Oct 2016 10:09:42 +0900
Subject: [PATCH] perf top: Fix refreshing hierarchy entries on TUI

Markus reported that perf top --hierarch 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-by: Markus Trippelsdorf <markus@...ppelsdorf.de>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/ui/browsers/hists.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index fb8e42c7507a..4ffff7be9299 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -601,7 +601,8 @@ int hist_browser__run(struct hist_browser *browser, const char *help)
 			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);
-- 
2.9.3