linux-kernel - [tip:perf/core] perf hist browser: Fix hierarchy column counts

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Date:   Fri, 28 Oct 2016 10:44:10 -0700
From:   tip-bot for Namhyung Kim <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     acme@...hat.com, mingo@...nel.org, namhyung@...nel.org,
        jolsa@...nel.org, linux-kernel@...r.kernel.org,
        markus@...ppelsdorf.de, hpa@...or.com, tglx@...utronix.de,
        peterz@...radead.org
Subject: [tip:perf/core] perf hist browser: Fix hierarchy column counts

Commit-ID:  8a06b0be6507f97f3aa92ca814335b8b65fd3de2
Gitweb:     http://git.kernel.org/tip/8a06b0be6507f97f3aa92ca814335b8b65fd3de2
Author:     Namhyung Kim <namhyung@...nel.org>
AuthorDate: Tue, 25 Oct 2016 01:21:10 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 25 Oct 2016 09:52:49 -0300

perf hist browser: Fix hierarchy column counts

The perf report/top on TUI supports horizontal scrolling using LEFT and
RIGHT keys.

But it calculate the number of columns incorrectly when hierarchy mode
is enabled so that keep pressing RIGHT key can make the output
disappeared.

In the hierarchy mode, all sort keys are collapsed into a single column,
so it needs to be applied when calculating column numbers.

Reported-and-Tested-by: Markus Trippelsdorf <markus@...ppelsdorf.de>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20161024162110.17918-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/ui/browsers/hists.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index ddc4c3e..84f5dd2 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -2076,8 +2076,21 @@ void hist_browser__init(struct hist_browser *browser,
 	browser->b.use_navkeypressed	= true;
 	browser->show_headers		= symbol_conf.show_hist_headers;
 
-	hists__for_each_format(hists, fmt)
+	if (symbol_conf.report_hierarchy) {
+		struct perf_hpp_list_node *fmt_node;
+
+		/* count overhead columns (in the first node) */
+		fmt_node = list_first_entry(&hists->hpp_formats,
+					    struct perf_hpp_list_node, list);
+		perf_hpp_list__for_each_format(&fmt_node->hpp, fmt)
+			++browser->b.columns;
+
+		/* add a single column for whole hierarchy sort keys*/
 		++browser->b.columns;
+	} else {
+		hists__for_each_format(hists, fmt)
+			++browser->b.columns;
+	}
 
 	hists__reset_column_width(hists);
 }