perf tools: Release session and symbol resources on exit

So that we reduce the noise when looking for leaks using tools such as
valgrind.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

7 files changed, 70 insertions, 3 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 5ae0d93d8597..ff77b805de71 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -440,6 +440,7 @@ static void atexit_header(void)
                 process_buildids();
                 perf_header__write(&session->header, output, true);
                 perf_session__delete(session);
+                symbol__exit();
         }
 }
 
@@ -871,7 +872,7 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
         } else {
                 all_tids=malloc(sizeof(pid_t));
                 if (!all_tids)
-                        return -ENOMEM;
+                        goto out_symbol_exit;
 
                 all_tids[0] = target_tid;
                 thread_num = 1;
@@ -918,5 +919,7 @@ out_free_fd:
         }
         free(all_tids);
         all_tids = NULL;
+out_symbol_exit:
+        symbol__exit();
         return err;
 }
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 8151d23664c7..6b0db5577929 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -515,12 +515,13 @@ int event__process_mmap(event_t *self, struct perf_session *session)
         if (machine == NULL)
                 goto out_problem;
         thread = perf_session__findnew(session, self->mmap.pid);
+        if (thread == NULL)
+                goto out_problem;
         map = map__new(&machine->user_dsos, self->mmap.start,
                         self->mmap.len, self->mmap.pgoff,
                         self->mmap.pid, self->mmap.filename,
                         MAP__FUNCTION);
-
-        if (thread == NULL || map == NULL)
+        if (map == NULL)
                 goto out_problem;
 
         thread__insert_map(thread, map);
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 2ddbae319de5..15d6a6dd50c5 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -539,6 +539,32 @@ int machine__init(struct machine *self, const char *root_dir, pid_t pid)
         return self->root_dir == NULL ? -ENOMEM : 0;
 }
 
+static void dsos__delete(struct list_head *self)
+{
+        struct dso *pos, *n;
+
+        list_for_each_entry_safe(pos, n, self, node) {
+                list_del(&pos->node);
+                dso__delete(pos);
+        }
+}
+
+void machine__exit(struct machine *self)
+{
+        struct kmap *kmap = map__kmap(self->vmlinux_maps[MAP__FUNCTION]);
+
+        if (kmap->ref_reloc_sym) {
+                free((char *)kmap->ref_reloc_sym->name);
+                free(kmap->ref_reloc_sym);
+        }
+
+        map_groups__exit(&self->kmaps);
+        dsos__delete(&self->user_dsos);
+        dsos__delete(&self->kernel_dsos);
+        free(self->root_dir);
+        self->root_dir = NULL;
+}
+
 struct machine *machines__add(struct rb_root *self, pid_t pid,
                               const char *root_dir)
 {
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index 20eba420ddae..0e0984e86fce 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -143,6 +143,7 @@ struct machine *machines__find(struct rb_root *self, pid_t pid);
 struct machine *machines__findnew(struct rb_root *self, pid_t pid);
 char *machine__mmap_name(struct machine *self, char *bf, size_t size);
 int machine__init(struct machine *self, const char *root_dir, pid_t pid);
+void machine__exit(struct machine *self);
 
 /*
  * Default guest kernel is defined by parameter --guestkallsyms
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 8cbea122e349..04a3b3db9e90 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -124,9 +124,35 @@ out_delete:
         return NULL;
 }
 
+static void perf_session__delete_dead_threads(struct perf_session *self)
+{
+        struct thread *n, *t;
+
+        list_for_each_entry_safe(t, n, &self->dead_threads, node) {
+                list_del(&t->node);
+                thread__delete(t);
+        }
+}
+
+static void perf_session__delete_threads(struct perf_session *self)
+{
+        struct rb_node *nd = rb_first(&self->threads);
+
+        while (nd) {
+                struct thread *t = rb_entry(nd, struct thread, rb_node);
+
+                rb_erase(&t->rb_node, &self->threads);
+                nd = rb_next(nd);
+                thread__delete(t);
+        }
+}
+
 void perf_session__delete(struct perf_session *self)
 {
         perf_header__exit(&self->header);
+        perf_session__delete_dead_threads(self);
+        perf_session__delete_threads(self);
+        machine__exit(&self->host_machine);
         close(self->fd);
         free(self);
 }
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index d99497ec52aa..94cdf68440cd 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -2245,6 +2245,15 @@ out_free_comm_list:
         return -1;
 }
 
+void symbol__exit(void)
+{
+        strlist__delete(symbol_conf.sym_list);
+        strlist__delete(symbol_conf.dso_list);
+        strlist__delete(symbol_conf.comm_list);
+        vmlinux_path__exit();
+        symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
+}
+
 int machines__create_kernel_maps(struct rb_root *self, pid_t pid)
 {
         struct machine *machine = machines__findnew(self, pid);
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index f29f73c20809..33d53ce28958 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -219,6 +219,7 @@ int machines__create_kernel_maps(struct rb_root *self, pid_t pid);
 int machines__create_guest_kernel_maps(struct rb_root *self);
 
 int symbol__init(void);
+void symbol__exit(void);
 bool symbol_type__is_a(char symbol_type, enum map_type map_type);
 
 size_t machine__fprintf_vmlinux_path(struct machine *self, FILE *fp);