[PATCH v1 20/20] perf map/maps/thread: Changes to reference counting

[Ian Rogers]

Fix missed reference count gets and puts as detected with leak
sanitizer and reference count checking.

Signed-off-by: Ian Rogers <irogers at google.com>
---
 tools/perf/util/callchain.c |  7 +++++--
 tools/perf/util/event.c     |  3 +++
 tools/perf/util/hist.c      |  6 ++++--
 tools/perf/util/machine.c   | 14 ++++++++------
 4 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index b0dafc758173..437325d19ad3 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -1065,8 +1065,10 @@ int callchain_cursor_append(struct callchain_cursor *cursor,
 	}
 
 	node->ip = ip;
+	maps__zput(node->ms.maps);
 	map__zput(node->ms.map);
 	node->ms = *ms;
+	node->ms.maps = maps__get(node->ms.maps);
 	node->ms.map = map__get(node->ms.map);
 	node->branch = branch;
 	node->nr_loop_iter = nr_loop_iter;
@@ -1114,7 +1116,8 @@ int fill_callchain_info(struct addr_location *al, struct callchain_cursor_node *
 {
 	struct machine *machine = maps__machine(node->ms.maps);
 
-	al->maps = node->ms.maps;
+	maps__put(al->maps);
+	al->maps = maps__get(node->ms.maps);
 	map__put(al->map);
 	al->map = map__get(node->ms.map);
 	al->sym = node->ms.sym;
@@ -1127,7 +1130,7 @@ int fill_callchain_info(struct addr_location *al, struct callchain_cursor_node *
 		if (al->map == NULL)
 			goto out;
 	}
-	if (al->maps == machine__kernel_maps(machine)) {
+	if (RC_CHK_ACCESS(al->maps) == RC_CHK_ACCESS(machine__kernel_maps(machine))) {
 		if (machine__is_host(machine)) {
 			al->cpumode = PERF_RECORD_MISC_KERNEL;
 			al->level = 'k';
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 2fcfba38fc48..3860b0c74829 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -711,6 +711,9 @@ int machine__resolve(struct machine *machine, struct addr_location *al,
 	if (thread__is_filtered(thread))
 		al->filtered |= (1 << HIST_FILTER__THREAD);
 
+	thread__put(thread);
+	thread = NULL;
+
 	al->sym = NULL;
 	al->cpu = sample->cpu;
 	al->socket = -1;
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index dfda52d348a3..fb218b3e8a7c 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -450,6 +450,7 @@ static int hist_entry__init(struct hist_entry *he,
 			memset(&he->stat, 0, sizeof(he->stat));
 	}
 
+	he->ms.maps = maps__get(he->ms.maps);
 	he->ms.map = map__get(he->ms.map);
 
 	if (he->branch_info) {
@@ -497,7 +498,7 @@ static int hist_entry__init(struct hist_entry *he,
 	}
 
 	INIT_LIST_HEAD(&he->pairs.node);
-	thread__get(he->thread);
+	he->thread = thread__get(he->thread);
 	he->hroot_in  = RB_ROOT_CACHED;
 	he->hroot_out = RB_ROOT_CACHED;
 
@@ -523,6 +524,7 @@ static int hist_entry__init(struct hist_entry *he,
 		map__put(he->mem_info->daddr.ms.map);
 	}
 err:
+	maps__zput(he->ms.maps);
 	map__zput(he->ms.map);
 	zfree(&he->stat_acc);
 	return -ENOMEM;
@@ -611,7 +613,6 @@ static struct hist_entry *hists__findnew_entry(struct hists *hists,
 		 * keys were used.
 		 */
 		cmp = hist_entry__cmp(he, entry);
-
 		if (!cmp) {
 			if (sample_self) {
 				he_stat__add_period(&he->stat, period);
@@ -1309,6 +1310,7 @@ void hist_entry__delete(struct hist_entry *he)
 	struct hist_entry_ops *ops = he->ops;
 
 	thread__zput(he->thread);
+	maps__zput(he->ms.maps);
 	map__zput(he->ms.map);
 
 	if (he->branch_info) {
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 359ef6b4e840..16dc49876e87 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -539,7 +539,7 @@ static void machine__update_thread_pid(struct machine *machine,
 		goto out_err;
 
 	if (thread__maps(th) == thread__maps(leader))
-		return;
+		goto out_put;
 
 	if (thread__maps(th)) {
 		/*
@@ -579,7 +579,7 @@ __threads__get_last_match(struct threads *threads, struct machine *machine,
 			machine__update_thread_pid(machine, th, pid);
 			return thread__get(th);
 		}
-
+		thread__put(threads->last_match);
 		threads->last_match = NULL;
 	}
 
@@ -601,7 +601,8 @@ threads__get_last_match(struct threads *threads, struct machine *machine,
 static void
 __threads__set_last_match(struct threads *threads, struct thread *th)
 {
-	threads->last_match = th;
+	thread__put(threads->last_match);
+	threads->last_match = thread__get(th);
 }
 
 static void
@@ -664,7 +665,6 @@ static struct thread *____machine__findnew_thread(struct machine *machine,
 
 	rb_link_node(&nd->rb_node, parent, p);
 	rb_insert_color_cached(&nd->rb_node, &threads->entries, leftmost);
-
 	/*
 	 * We have to initialize maps separately after rb tree is updated.
 	 *
@@ -673,6 +673,7 @@ static struct thread *____machine__findnew_thread(struct machine *machine,
 	 * the rb tree.
 	 */
 	if (thread__init_maps(th, machine)) {
+		pr_err("Thread init failed thread %d\n", pid);
 		rb_erase_cached(&nd->rb_node, &threads->entries);
 		RB_CLEAR_NODE(&nd->rb_node);
 		free(nd);
@@ -682,11 +683,10 @@ static struct thread *____machine__findnew_thread(struct machine *machine,
 	/*
 	 * It is now in the rbtree, get a ref
 	 */
-	thread__get(th);
 	threads__set_last_match(threads, th);
 	++threads->nr;
 
-	return th;
+	return thread__get(th);
 }
 
 struct thread *__machine__findnew_thread(struct machine *machine, pid_t pid, pid_t tid)
@@ -2395,6 +2395,8 @@ static int add_callchain_ip(struct thread *thread,
 				      iter_cycles, branch_from, srcline);
 out:
 	addr_location__exit(&al);
+	maps__put(ms.maps);
+	map__put(ms.map);
 	return err;
 }
 
-- 
2.41.0.rc0.172.g3f132b7071-goog