diff --git a/tools/perf/utils.py b/tools/perf/utils.py
new file mode 100644
index 0000000..08e393f
--- /dev/null
+++ b/tools/perf/utils.py
@@ -0,0 +1,30 @@
+# Copyright (C) 2023 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import os
+import pathlib
+
+DEFAULT_REPORT_DIR = "benchmarks"
+
+def get_root():
+    top_dir = os.environ.get("ANDROID_BUILD_TOP")
+    if top_dir:
+        return pathlib.Path(top_dir).resolve()
+    d = pathlib.Path.cwd()
+    while True:
+        if d.joinpath("build", "soong", "soong_ui.bash").exists():
+            return d.resolve().absolute()
+        d = d.parent
+        if d == pathlib.Path("/"):
+            return None