linux-kernel - [tip:perf/core] perf hists browser: Fix UI bug after fold/unfold

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Date:	Sat, 14 Mar 2015 00:05:24 -0700
From:	tip-bot for He Kuang <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	jolsa@...nel.org, mingo@...nel.org, tglx@...utronix.de,
	hpa@...or.com, paulus@...ba.org, linux-kernel@...r.kernel.org,
	acme@...hat.com, namhyung@...nel.org, wangnan0@...wei.com,
	a.p.zijlstra@...llo.nl, hekuang@...wei.com
Subject: [tip:perf/core] perf hists browser: Fix UI bug after fold/unfold

Commit-ID:  4fabf3d19cec11d9faa567f8cf0290298c5a93ea
Gitweb:     http://git.kernel.org/tip/4fabf3d19cec11d9faa567f8cf0290298c5a93ea
Author:     He Kuang <hekuang@...wei.com>
AuthorDate: Thu, 12 Mar 2015 15:21:49 +0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 12 Mar 2015 13:18:38 -0300

perf hists browser: Fix UI bug after fold/unfold

In perf hists browser, the fold/unfold stat of each hist entry is
recorded but hb->nr_callchain_rows loses its value after zoom out and
zoom in back. This causes a wrong row cursor range that restrict user to
move down anymore.

This bug can be reproduced as follows:

  $ perf record -g -e syscalls:* ls
  $ perf report

    Available samples
  ================================================================
    2 syscalls:sys_enter_mprotect <= [enter one of the entries]
    2 syscalls:sys_exit_mprotect
    13 syscalls:sys_enter_brk
    ...

In the hists brower, unfold some of the items, now the cursor can reach
to any rows:

    Children      Self  Command  Shared Object          Symbol
  ================================================================
  -  100.00%   100.00%  ls       libuClibc-0.9.33.2.so  [.] lstat64
  - lstat64
       16.67% 0x6469702e64
       8.33% 0x646970
       8.33% 0x617461
       8.33% 0x65
  -   16.67%     0.00%  ls       [unknown]              [.]0x6469702e64
     0x6469702e64 <= [cursor can reach to bottom line, everything is ok]

Now, zoom back to "Available samples" and enter again:

    Children      Self  Command  Shared Object          Symbol
  ================================================================
  -  100.00%   100.00%  ls       libuClibc-0.9.33.2.so  [.] lstat64
  - lstat64
       16.67% 0x6469702e64
       8.33% 0x646970
       8.33% 0x617461 <= [cursor may stop here, can't move down anymore]
       8.33% 0x65
  -   16.67%     0.00%  ls       [unknown]              [.]0x6469702e64
     0x6469702e64

This patch recalculates hb->nr_callchain_rows to fix the bug.

Signed-off-by: He Kuang <hekuang@...wei.com>
Acked-by: Namhyung Kim <namhyung@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/r/1426144909-18951-1-git-send-email-hekuang@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/ui/browsers/hists.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index ad312d9..49eddeb 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -48,6 +48,24 @@ static bool hist_browser__has_filter(struct hist_browser *hb)
 	return hists__has_filter(hb->hists) || hb->min_pcnt;
 }
 
+static int hist_browser__get_folding(struct hist_browser *browser)
+{
+	struct rb_node *nd;
+	struct hists *hists = browser->hists;
+	int unfolded_rows = 0;
+
+	for (nd = rb_first(&hists->entries);
+	     (nd = hists__filter_entries(nd, browser->min_pcnt)) != NULL;
+	     nd = rb_next(nd)) {
+		struct hist_entry *he =
+			rb_entry(nd, struct hist_entry, rb_node);
+
+		if (he->ms.unfolded)
+			unfolded_rows += he->nr_rows;
+	}
+	return unfolded_rows;
+}
+
 static u32 hist_browser__nr_entries(struct hist_browser *hb)
 {
 	u32 nr_entries;
@@ -57,6 +75,7 @@ static u32 hist_browser__nr_entries(struct hist_browser *hb)
 	else
 		nr_entries = hb->hists->nr_entries;
 
+	hb->nr_callchain_rows = hist_browser__get_folding(hb);
 	return nr_entries + hb->nr_callchain_rows;
 }
 
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