diff --git a/libprocessgroup/vts/Android.bp b/libprocessgroup/vts/Android.bp
new file mode 100644
index 0000000..1ec49a4
--- /dev/null
+++ b/libprocessgroup/vts/Android.bp
@@ -0,0 +1,15 @@
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+cc_test {
+    name: "vts_libprocessgroup",
+    srcs: ["vts_libprocessgroup.cpp"],
+    shared_libs: ["libbase"],
+    static_libs: ["libgmock"],
+    require_root: true,
+    test_suites: [
+        "general-tests",
+        "vts",
+    ],
+}
diff --git a/libprocessgroup/vts/vts_libprocessgroup.cpp b/libprocessgroup/vts/vts_libprocessgroup.cpp
new file mode 100644
index 0000000..af0b0af
--- /dev/null
+++ b/libprocessgroup/vts/vts_libprocessgroup.cpp
@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2025 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.
+ */
+
+#include <cerrno>
+#include <chrono>
+#include <cstdio>
+#include <filesystem>
+#include <future>
+#include <iostream>
+#include <optional>
+#include <random>
+#include <string>
+#include <vector>
+
+#include <unistd.h>
+
+#include <android-base/file.h>
+#include <android-base/strings.h>
+using android::base::ReadFileToString;
+using android::base::Split;
+using android::base::WriteStringToFile;
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+namespace {
+
+const std::string CGROUP_V2_ROOT_PATH = "/sys/fs/cgroup";
+
+std::optional<bool> isMemcgV2Enabled() {
+    if (std::string proc_cgroups; ReadFileToString("/proc/cgroups", &proc_cgroups)) {
+        const std::vector<std::string> lines = Split(proc_cgroups, "\n");
+        for (const std::string& line : lines) {
+            if (line.starts_with("memory")) {
+                const bool enabled = line.back() == '1';
+                if (!enabled) return false;
+
+                const std::vector<std::string> memcg_tokens = Split(line, "\t");
+                return memcg_tokens[1] == "0";  // 0 == default hierarchy == v2
+            }
+        }
+        // We know for sure it's not enabled, either because it is mounted as v1 (cgroups.json
+        // override) which would be detected above, or because it was intentionally disabled via
+        // kernel command line (cgroup_disable=memory), or because it's not built in to the kernel
+        // (CONFIG_MEMCG is not set).
+        return false;
+    }
+
+    // Problems accessing /proc/cgroups (sepolicy?) Try checking the root cgroup.controllers file.
+    perror("Warning: Could not read /proc/cgroups");
+    if (std::string controllers;
+        ReadFileToString(CGROUP_V2_ROOT_PATH + "/cgroup.controllers", &controllers)) {
+        return controllers.find("memory") != std::string::npos;
+    }
+
+    std::cerr << "Error: Could not read " << CGROUP_V2_ROOT_PATH
+              << "/cgroup.controllers: " << std::strerror(errno) << std::endl;
+    return std::nullopt;
+}
+
+std::optional<bool> checkRootSubtreeState() {
+    if (std::string controllers;
+        ReadFileToString(CGROUP_V2_ROOT_PATH + "/cgroup.subtree_control", &controllers)) {
+        return controllers.find("memory") != std::string::npos;
+    }
+    std::cerr << "Error: Could not read " << CGROUP_V2_ROOT_PATH
+              << "/cgroup.subtree_control: " << std::strerror(errno) << std::endl;
+    return std::nullopt;
+}
+
+}  // anonymous namespace
+
+
+class MemcgV2Test : public testing::Test {
+  protected:
+    void SetUp() override {
+        std::optional<bool> memcgV2Enabled = isMemcgV2Enabled();
+        ASSERT_NE(memcgV2Enabled, std::nullopt);
+        if (!*memcgV2Enabled) GTEST_SKIP() << "Memcg v2 not enabled";
+    }
+};
+
+class MemcgV2SubdirTest : public testing::Test {
+  protected:
+    std::optional<std::string> mRandDir;
+
+    void SetUp() override {
+        std::optional<bool> memcgV2Enabled = isMemcgV2Enabled();
+        ASSERT_NE(memcgV2Enabled, std::nullopt);
+        if (!*memcgV2Enabled) GTEST_SKIP() << "Memcg v2 not enabled";
+
+        mRootSubtreeState = checkRootSubtreeState();
+        ASSERT_NE(mRootSubtreeState, std::nullopt);
+
+        if (!*mRootSubtreeState) {
+            ASSERT_TRUE(
+                    WriteStringToFile("+memory", CGROUP_V2_ROOT_PATH + "/cgroup.subtree_control"))
+                    << "Could not enable memcg under root: " << std::strerror(errno);
+        }
+
+        // Make a new, temporary, randomly-named v2 cgroup in which we will attempt to activate
+        // memcg
+        std::random_device rd;
+        std::uniform_int_distribution dist(static_cast<int>('A'), static_cast<int>('Z'));
+        std::string randName = CGROUP_V2_ROOT_PATH + "/vts_libprocessgroup.";
+        for (int i = 0; i < 10; ++i) randName.append(1, static_cast<char>(dist(rd)));
+        ASSERT_TRUE(std::filesystem::create_directory(randName));
+        mRandDir = randName;  // For cleanup in TearDown
+
+        std::string subtree_controllers;
+        ASSERT_TRUE(ReadFileToString(*mRandDir + "/cgroup.controllers", &subtree_controllers));
+        ASSERT_NE(subtree_controllers.find("memory"), std::string::npos)
+                << "Memcg was not activated in child cgroup";
+    }
+
+    void TearDown() override {
+        if (mRandDir) {
+            if (!std::filesystem::remove(*mRandDir)) {
+                std::cerr << "Could not remove temporary memcg v2 test directory" << std::endl;
+            }
+        }
+
+        if (!*mRootSubtreeState) {
+            if (!WriteStringToFile("-memory", CGROUP_V2_ROOT_PATH + "/cgroup.subtree_control")) {
+                std::cerr << "Could not disable memcg under root: " << std::strerror(errno)
+                          << std::endl;
+            }
+        }
+    }
+
+  private:
+    std::optional<bool> mRootSubtreeState;
+};
+
+
+TEST_F(MemcgV2SubdirTest, CanActivateMemcgV2Subtree) {
+    ASSERT_TRUE(WriteStringToFile("+memory", *mRandDir + "/cgroup.subtree_control"))
+            << "Could not enable memcg under child cgroup subtree";
+}
+
+// Test for fix: mm: memcg: use larger batches for proactive reclaim
+// https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=287d5fedb377ddc232b216b882723305b27ae31a
+TEST_F(MemcgV2Test, ProactiveReclaimDoesntTakeForever) {
+    // Not all kernels have memory.reclaim
+    const std::filesystem::path reclaim(CGROUP_V2_ROOT_PATH + "/memory.reclaim");
+    if (!std::filesystem::exists(reclaim)) GTEST_SKIP() << "memory.reclaim not found";
+
+    // Use the total device memory as the amount to reclaim
+    const long numPages = sysconf(_SC_PHYS_PAGES);
+    const long pageSize = sysconf(_SC_PAGE_SIZE);
+    ASSERT_GT(numPages, 0);
+    ASSERT_GT(pageSize, 0);
+    const unsigned long long totalMem =
+            static_cast<unsigned long long>(numPages) * static_cast<unsigned long long>(pageSize);
+
+    auto fut = std::async(std::launch::async,
+                          [&]() { WriteStringToFile(std::to_string(totalMem), reclaim); });
+
+    // This is a test for completion within the timeout. The command is likely to "fail" since we
+    // are asking to reclaim all device memory.
+    ASSERT_NE(fut.wait_for(std::chrono::seconds(20)), std::future_status::timeout);
+}