[tip:perf/core] perf top: Delete half-processed hist entries when exit

[tip-bot for Namhyung Kim <tipbot@zytor.com>]

Commit-ID:  61fa0e94ca6ab62db5e095a5528150bf9962196d
Gitweb:     http://git.kernel.org/tip/61fa0e94ca6ab62db5e095a5528150bf9962196d
Author:     Namhyung Kim <namhyung@kernel.org>
AuthorDate: Thu, 10 Dec 2015 16:53:20 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Thu, 10 Dec 2015 15:56:58 -0300

perf top: Delete half-processed hist entries when exit

After sample processing is done, hist entries are in both of
hists->entries and hists->entries_in (or hists->entries_collapsed).  So
I guess perf report does not have leaks on hists.

But for perf top, it's possible to have half-processed entries which are
only in hists->entries_in.  Eventually they will go to the
hists->entries and get freed but they cannot be deleted by current
hists__delete_entries().  This patch adds hists__delete_all_entries
function to delete those entries.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-and-Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1449734015-9148-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/hist.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 565ea35..56e97f5 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -270,6 +270,8 @@ static void hists__delete_entry(struct hists *hists, struct hist_entry *he)
 
 	if (sort__need_collapse)
 		rb_erase(&he->rb_node_in, &hists->entries_collapsed);
+	else
+		rb_erase(&he->rb_node_in, hists->entries_in);
 
 	--hists->nr_entries;
 	if (!he->filtered)
@@ -1567,11 +1569,33 @@ static int hists_evsel__init(struct perf_evsel *evsel)
 	return 0;
 }
 
+static void hists__delete_remaining_entries(struct rb_root *root)
+{
+	struct rb_node *node;
+	struct hist_entry *he;
+
+	while (!RB_EMPTY_ROOT(root)) {
+		node = rb_first(root);
+		rb_erase(node, root);
+
+		he = rb_entry(node, struct hist_entry, rb_node_in);
+		hist_entry__delete(he);
+	}
+}
+
+static void hists__delete_all_entries(struct hists *hists)
+{
+	hists__delete_entries(hists);
+	hists__delete_remaining_entries(&hists->entries_in_array[0]);
+	hists__delete_remaining_entries(&hists->entries_in_array[1]);
+	hists__delete_remaining_entries(&hists->entries_collapsed);
+}
+
 static void hists_evsel__exit(struct perf_evsel *evsel)
 {
 	struct hists *hists = evsel__hists(evsel);
 
-	hists__delete_entries(hists);
+	hists__delete_all_entries(hists);
 }
 
 /*