perf maps: Purge all maps from the 'names' tree

Add function __maps__purge_names() to purge all maps from the names
tree.  We need to cleanup the names tree in maps__exit().

Detected with gcc's ASan.

Signed-off-by: Changbin Du <changbin.du@gmail.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Eric Saint-Etienne <eric.saint.etienne@oracle.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Fixes: 1e6285699b30 ("perf symbols: Fix slowness due to -ffunction-section")
Link: http://lkml.kernel.org/r/20190316080556.3075-12-changbin.du@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 64bea5e..e32628c 100644 (file)
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -577,10 +577,25 @@ static void __maps__purge(struct maps *maps)
        }
 }
 
+static void __maps__purge_names(struct maps *maps)
+{
+       struct rb_root *root = &maps->names;
+       struct rb_node *next = rb_first(root);
+
+       while (next) {
+               struct map *pos = rb_entry(next, struct map, rb_node_name);
+
+               next = rb_next(&pos->rb_node_name);
+               rb_erase_init(&pos->rb_node_name, root);
+               map__put(pos);
+       }
+}
+
 static void maps__exit(struct maps *maps)
 {
        down_write(&maps->lock);
        __maps__purge(maps);
+       __maps__purge_names(maps);
        up_write(&maps->lock);
 }