diff --git a/libprocessgroup/Android.bp b/libprocessgroup/Android.bp
index f529ad7..bb855d5 100644
--- a/libprocessgroup/Android.bp
+++ b/libprocessgroup/Android.bp
@@ -8,6 +8,7 @@
     config_namespace: "ANDROID",
     bool_variables: [
         "memcg_v2_force_enabled",
+        "cgroup_v2_sys_app_isolation",
     ],
     properties: [
         "cflags",
@@ -23,6 +24,11 @@
                 "-DMEMCG_V2_FORCE_ENABLED=true",
             ],
         },
+        cgroup_v2_sys_app_isolation: {
+            cflags: [
+                "-DCGROUP_V2_SYS_APP_ISOLATION=true",
+            ],
+        },
     },
 }
 
diff --git a/libprocessgroup/build_flags.h b/libprocessgroup/build_flags.h
index 69fa76e..bc3e7df 100644
--- a/libprocessgroup/build_flags.h
+++ b/libprocessgroup/build_flags.h
@@ -20,10 +20,18 @@
 #define MEMCG_V2_FORCE_ENABLED false
 #endif
 
+#ifndef CGROUP_V2_SYS_APP_ISOLATION
+#define CGROUP_V2_SYS_APP_ISOLATION false
+#endif
+
 namespace android::libprocessgroup_flags {
 
 inline consteval bool force_memcg_v2() {
     return MEMCG_V2_FORCE_ENABLED;
 }
 
+inline consteval bool cgroup_v2_sys_app_isolation() {
+    return CGROUP_V2_SYS_APP_ISOLATION;
+}
+
 }  // namespace android::libprocessgroup_flags
diff --git a/libprocessgroup/setup/cgroup_map_write.cpp b/libprocessgroup/setup/cgroup_map_write.cpp
index a9fd0e5..1b26fbc 100644
--- a/libprocessgroup/setup/cgroup_map_write.cpp
+++ b/libprocessgroup/setup/cgroup_map_write.cpp
@@ -483,6 +483,42 @@
     return content.find("memory") == std::string::npos;
 }
 
+static bool CreateV2SubHierarchy(
+        const std::string& path,
+        const std::map<std::string, android::cgrouprc::CgroupDescriptor>& descriptors) {
+    using namespace android::cgrouprc;
+
+    const auto cgv2_iter = descriptors.find(CGROUPV2_HIERARCHY_NAME);
+    if (cgv2_iter == descriptors.end()) return false;
+    const android::cgrouprc::CgroupDescriptor cgv2_descriptor = cgv2_iter->second;
+
+    if (!Mkdir(path, cgv2_descriptor.mode(), cgv2_descriptor.uid(), cgv2_descriptor.gid())) {
+        PLOG(ERROR) << "Failed to create directory for " << path;
+        return false;
+    }
+
+    // Activate all v2 controllers in path so they can be activated in
+    // children as they are created.
+    for (const auto& [name, descriptor] : descriptors) {
+        const format::CgroupController* controller = descriptor.controller();
+        std::uint32_t flags = controller->flags();
+        if (controller->version() == 2 && name != CGROUPV2_HIERARCHY_NAME &&
+            flags & CGROUPRC_CONTROLLER_FLAG_NEEDS_ACTIVATION) {
+            std::string str("+");
+            str += controller->name();
+            if (!android::base::WriteStringToFile(str, path + "/cgroup.subtree_control")) {
+                if (flags & CGROUPRC_CONTROLLER_FLAG_OPTIONAL) {
+                    PLOG(WARNING) << "Activation of cgroup controller " << str << " failed in path "
+                                  << path;
+                } else {
+                    return false;
+                }
+            }
+        }
+    }
+    return true;
+}
+
 bool CgroupSetup() {
     using namespace android::cgrouprc;
 
@@ -527,6 +563,21 @@
         }
     }
 
+    // System / app isolation.
+    // This really belongs in early-init in init.rc, but we cannot use the flag there.
+    if (android::libprocessgroup_flags::cgroup_v2_sys_app_isolation()) {
+        const auto it = descriptors.find(CGROUPV2_HIERARCHY_NAME);
+        const std::string cgroup_v2_root = (it == descriptors.end())
+                                                   ? CGROUP_V2_ROOT_DEFAULT
+                                                   : it->second.controller()->path();
+
+        LOG(INFO) << "Using system/app isolation under: " << cgroup_v2_root;
+        if (!CreateV2SubHierarchy(cgroup_v2_root + "/apps", descriptors) ||
+            !CreateV2SubHierarchy(cgroup_v2_root + "/system", descriptors)) {
+            return false;
+        }
+    }
+
     // mkdir <CGROUPS_RC_DIR> 0711 system system
     if (!Mkdir(android::base::Dirname(CGROUPS_RC_PATH), 0711, "system", "system")) {
         LOG(ERROR) << "Failed to create directory for " << CGROUPS_RC_PATH << " file";
diff --git a/libprocessgroup/task_profiles.cpp b/libprocessgroup/task_profiles.cpp
index c376a0f..0c2252b 100644
--- a/libprocessgroup/task_profiles.cpp
+++ b/libprocessgroup/task_profiles.cpp
@@ -33,6 +33,8 @@
 #include <json/reader.h>
 #include <json/value.h>
 
+#include <build_flags.h>
+
 // To avoid issues in sdk_mac build
 #if defined(__ANDROID__)
 #include <sys/prctl.h>
@@ -126,7 +128,17 @@
     file_v2_name_ = file_v2_name;
 }
 
+static bool isSystemApp(uid_t uid) {
+    return uid < AID_APP_START;
+}
+
 std::string ConvertUidToPath(const char* root_cgroup_path, uid_t uid) {
+    if (android::libprocessgroup_flags::cgroup_v2_sys_app_isolation()) {
+        if (isSystemApp(uid))
+            return StringPrintf("%s/system/uid_%u", root_cgroup_path, uid);
+        else
+            return StringPrintf("%s/apps/uid_%u", root_cgroup_path, uid);
+    }
     return StringPrintf("%s/uid_%u", root_cgroup_path, uid);
 }