Add build flag to force memcg to the v2 cgroup hierarchy
This flag prevents memcg from being mounted as a v1 hierarchy, even if
cgroups.json specifies it should be mounted as v1. It will activate
memcg in the v2 hierarchy even if cgroups.json does not specify that it
should be activated in the v2 hierarchy.
The cgroup_disable=memory kernel command line argument will still
prevent memcg from being activated, as this forced memcg controller
is marked as optional.
Bug: 327480673
Change-Id: Iad2491dd0c1576156ee2346928d041d85af890f0
diff --git a/libprocessgroup/build_flags.h b/libprocessgroup/build_flags.h
new file mode 100644
index 0000000..69fa76e
--- /dev/null
+++ b/libprocessgroup/build_flags.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2024 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.
+ */
+
+#pragma once
+
+#ifndef MEMCG_V2_FORCE_ENABLED
+#define MEMCG_V2_FORCE_ENABLED false
+#endif
+
+namespace android::libprocessgroup_flags {
+
+inline consteval bool force_memcg_v2() {
+ return MEMCG_V2_FORCE_ENABLED;
+}
+
+} // namespace android::libprocessgroup_flags