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From: He Kuang <hekuang@huawei.com>
To: <namhyung@kernel.org>
Cc: <a.p.zijlstra@chello.nl>, <paulus@samba.org>, <mingo@redhat.com>,
	<acme@kernel.org>, <jolsa@kernel.org>, <wangnan0@huawei.com>,
	<linux-kernel@vger.kernel.org>
Subject: [PATCHv2 2/2] perf hists browser: Fix UI bug after zoom into thread/dso/symbol
Date: Wed, 11 Mar 2015 20:36:03 +0800	[thread overview]
Message-ID: <1426077363-855-2-git-send-email-hekuang@huawei.com> (raw)
In-Reply-To: <1426077363-855-1-git-send-email-hekuang@huawei.com>

When zoom into thread/dso/symbol, the fold/unfold stat is cleared in
hists__filter_by_thread/dso/symbol(), but h->nr_rows is not cleared. So
if we toggle fold stat on the unfold entires, nr_entries got a wrong
value.

This bug can be reproduced as follows:

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

    Children      Self  Command  Shared Object            Symbol
  ================================================================
  +   50.00%     0.00%  ls       ld64.so  [.]  _dl_get_ready_to_run
  -   50.00%     0.00%  ls       ld64.so  [.]  _dl_load_shared_library
      _dl_load_shared_library <= [Zoom into thread/dso]
      _dl_get_ready_to_run
      _start
  ...

In the new thread hists, all entries reset to fold, if we unfold the
same entry as we previously unfolded, nr_entries got wrong value, and we
can't move down cursor to bottom row.

                                                         Thread: ls
    Children      Self  Command  Shared Object            Symbol
  ================================================================
  +   50.00%     0.00%  ls       ld64.so  [.]  _dl_get_ready_to_run
  -   50.00%     0.00%  ls       ld64.so  [.]  _dl_load_shared_library
      _dl_load_shared_library
      _dl_get_ready_to_run <= [cursor may stop here, can't move down]
      _start
  ...

This patch clear h->nr_rows to fix this bug.

Signed-off-by: He Kuang <hekuang@huawei.com>
---
 tools/perf/util/hist.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 70b48a6..24aff7d 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -1169,6 +1169,7 @@ static void hists__remove_entry_filter(struct hists *hists, struct hist_entry *h
 	/* force fold unfiltered entry for simplicity */
 	h->ms.unfolded = false;
 	h->row_offset = 0;
+	h->nr_rows = 0;
 
 	hists->stats.nr_non_filtered_samples += h->stat.nr_events;
 
-- 
2.2.0.33.gc18b867


  reply	other threads:[~2015-03-11 12:40 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-06 12:51 [PATCH] perf hists browser: Fix UI bug after fold/unfold He Kuang
2015-03-10  6:28 ` Namhyung Kim
2015-03-10  7:26   ` He Kuang
2015-03-11  0:26     ` Namhyung Kim
2015-03-11 12:36       ` [PATCHv2 1/2] " He Kuang
2015-03-11 12:36         ` He Kuang [this message]
2015-03-11 14:12           ` [PATCHv2 2/2] perf hists browser: Fix UI bug after zoom into thread/dso/symbol Arnaldo Carvalho de Melo
2015-03-12  8:05           ` Namhyung Kim
2015-03-14  7:04           ` [tip:perf/core] " tip-bot for He Kuang
2015-03-11 13:48         ` [PATCHv2 1/2] perf hists browser: Fix UI bug after fold/unfold Arnaldo Carvalho de Melo
2015-03-12  7:21           ` [PATCHv3] " He Kuang
2015-03-12  7:51             ` Namhyung Kim
2015-03-12 16:19               ` Arnaldo Carvalho de Melo
2015-03-14  7:05             ` [tip:perf/core] " tip-bot for He Kuang

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