diff --git a/aidl/memtrack/core/Android.bp b/aidl/memtrack/core/Android.bp
new file mode 100644
index 0000000..cfce23e
--- /dev/null
+++ b/aidl/memtrack/core/Android.bp
@@ -0,0 +1,34 @@
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+cc_library_shared {
+    name: "libmemtrack-pixel",
+    vendor: true,
+    srcs: [
+        "Memtrack.cpp",
+        "GpuSysfsReader.cpp",
+        "filesystem.cpp",
+    ],
+    export_include_dirs: [
+        "include",
+    ],
+    shared_libs: [
+        "android.hardware.memtrack-V1-ndk",
+        "libbase",
+        "libbinder_ndk",
+        "liblog",
+    ],
+    cppflags: [
+        "-Wall",
+        "-Werror",
+        "-Wformat",
+        "-Wthread-safety",
+        "-Wunused",
+        "-Wunreachable-code",
+    ],
+    visibility: [
+        "//hardware/google/graphics/common/memtrack-pixel/service:__pkg__"
+    ],
+}
diff --git a/aidl/memtrack/core/GpuSysfsReader.cpp b/aidl/memtrack/core/GpuSysfsReader.cpp
new file mode 100644
index 0000000..48e09a2
--- /dev/null
+++ b/aidl/memtrack/core/GpuSysfsReader.cpp
@@ -0,0 +1,59 @@
+#include "GpuSysfsReader.h"
+
+#include <log/log.h>
+
+#include <fstream>
+#include <sstream>
+
+#include "filesystem.h"
+
+#undef LOG_TAG
+#define LOG_TAG "memtrack-gpusysfsreader"
+
+using namespace GpuSysfsReader;
+
+namespace {
+uint64_t readNode(const std::string node, pid_t pid) {
+    std::stringstream ss;
+    if (pid)
+        ss << kSysfsDevicePath << "/" << kProcessDir << "/" << pid << "/" << node;
+    else
+        ss << kSysfsDevicePath << "/" << node;
+    const std::string path = ss.str();
+
+    if (!filesystem::exists(filesystem::path(path))) {
+        ALOGV("File not found: %s", path.c_str());
+        return 0;
+    }
+
+    std::ifstream file(path.c_str());
+    if (!file.is_open()) {
+        ALOGW("Failed to open %s path", path.c_str());
+        return 0;
+    }
+
+    uint64_t out;
+    file >> out;
+    file.close();
+
+    return out;
+}
+} // namespace
+
+uint64_t GpuSysfsReader::getDmaBufGpuMem(pid_t pid) { return readNode(kDmaBufGpuMemNode, pid); }
+
+uint64_t GpuSysfsReader::getGpuMemTotal(pid_t pid) { return readNode(kTotalGpuMemNode, pid); }
+
+uint64_t GpuSysfsReader::getPrivateGpuMem(pid_t pid) {
+    auto dma_buf_size = getDmaBufGpuMem(pid);
+    auto gpu_total_size = getGpuMemTotal(pid);
+
+    if (dma_buf_size > gpu_total_size) {
+        ALOGE("Bug in reader, dma-buf size (%" PRIu64 ") is higher than total gpu size (%" PRIu64
+              ")",
+              dma_buf_size, gpu_total_size);
+        return 0;
+    }
+
+    return gpu_total_size - dma_buf_size;
+}
diff --git a/aidl/memtrack/core/GpuSysfsReader.h b/aidl/memtrack/core/GpuSysfsReader.h
new file mode 100644
index 0000000..df622d1
--- /dev/null
+++ b/aidl/memtrack/core/GpuSysfsReader.h
@@ -0,0 +1,17 @@
+
+#pragma once
+
+#include <inttypes.h>
+#include <sys/types.h>
+
+namespace GpuSysfsReader {
+uint64_t getDmaBufGpuMem(pid_t pid = 0);
+uint64_t getGpuMemTotal(pid_t pid = 0);
+uint64_t getPrivateGpuMem(pid_t pid = 0);
+
+constexpr char kSysfsDevicePath[] = "/sys/class/misc/mali0/device";
+constexpr char kProcessDir[] = "kprcs";
+constexpr char kMappedDmaBufsDir[] = "dma_bufs";
+constexpr char kTotalGpuMemNode[] = "total_gpu_mem";
+constexpr char kDmaBufGpuMemNode[] = "dma_buf_gpu_mem";
+} // namespace GpuSysfsReader
diff --git a/aidl/memtrack/core/Memtrack.cpp b/aidl/memtrack/core/Memtrack.cpp
new file mode 100644
index 0000000..48d4fa7
--- /dev/null
+++ b/aidl/memtrack/core/Memtrack.cpp
@@ -0,0 +1,79 @@
+#include <Memtrack.h>
+#include <stdlib.h>
+
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include "GpuSysfsReader.h"
+#include "filesystem.h"
+
+#undef LOG_TAG
+#define LOG_TAG "memtrack-core"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace memtrack {
+
+ndk::ScopedAStatus Memtrack::getMemory(int pid, MemtrackType type,
+                                       std::vector<MemtrackRecord>* _aidl_return) {
+    if (pid < 0)
+        return ndk::ScopedAStatus(AStatus_fromExceptionCode(EX_ILLEGAL_ARGUMENT));
+
+    if (type != MemtrackType::OTHER && type != MemtrackType::GL && type != MemtrackType::GRAPHICS &&
+        type != MemtrackType::MULTIMEDIA && type != MemtrackType::CAMERA)
+        return ndk::ScopedAStatus(AStatus_fromExceptionCode(EX_UNSUPPORTED_OPERATION));
+
+    _aidl_return->clear();
+
+    // Other types are retained only for backward compatibility
+    if (type != MemtrackType::GL && type != MemtrackType::GRAPHICS)
+        return ndk::ScopedAStatus::ok();
+
+    // pid 0 is only supported for GL type to report total private memory
+    if (pid == 0 && type != MemtrackType::GL)
+        return ndk::ScopedAStatus::ok();
+
+    uint64_t size = 0;
+    switch (type) {
+        case MemtrackType::GL:
+            size = GpuSysfsReader::getPrivateGpuMem(pid);
+            break;
+        case MemtrackType::GRAPHICS:
+            // TODO(b/194483693): This is not PSS as required by memtrack HAL
+            // but complete dmabuf allocations. Reporting PSS requires reading
+            // procfs. This HAL does not have that permission yet.
+            size = GpuSysfsReader::getDmaBufGpuMem(pid);
+            break;
+        default:
+            break;
+    }
+
+    MemtrackRecord record = {
+            .flags = MemtrackRecord::FLAG_SMAPS_UNACCOUNTED,
+            .sizeInBytes = static_cast<long>(size),
+    };
+    _aidl_return->emplace_back(record);
+
+    return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus Memtrack::getGpuDeviceInfo(std::vector<DeviceInfo>* _aidl_return) {
+    auto devPath = filesystem::path(GpuSysfsReader::kSysfsDevicePath);
+    std::string devName = "default-gpu";
+    if (filesystem::exists(devPath) && filesystem::is_symlink(devPath)) {
+        devName = filesystem::read_symlink(devPath).filename().string();
+    }
+
+    DeviceInfo dev_info = {.id = 0, .name = devName};
+
+    _aidl_return->clear();
+    _aidl_return->emplace_back(dev_info);
+    return ndk::ScopedAStatus::ok();
+}
+
+} // namespace memtrack
+} // namespace hardware
+} // namespace android
+} // namespace aidl
diff --git a/aidl/memtrack/core/filesystem.cpp b/aidl/memtrack/core/filesystem.cpp
new file mode 100644
index 0000000..fa25fdc
--- /dev/null
+++ b/aidl/memtrack/core/filesystem.cpp
@@ -0,0 +1,70 @@
+#include "filesystem.h"
+
+#include <dirent.h>
+#include <log/log.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <sstream>
+#include <string>
+#include <vector>
+
+namespace filesystem {
+
+bool exists(const path& p) {
+    struct stat s;
+    return stat(p.string().c_str(), &s) == 0;
+}
+
+bool is_directory(const path& p) {
+    struct stat s;
+    if (stat(p.string().c_str(), &s))
+        return false;
+
+    return S_ISDIR(s.st_mode);
+}
+
+bool is_symlink(const path& p) {
+    struct stat s;
+    if (lstat(p.string().c_str(), &s))
+        return false;
+
+    return S_ISLNK(s.st_mode);
+}
+
+path read_symlink(const path& p) {
+    char* actualPath = realpath(p.string().c_str(), NULL);
+    if (!actualPath) {
+        return path(p.string());
+    }
+
+    path out(actualPath);
+    free(actualPath);
+    return out;
+}
+
+std::vector<directory_entry> directory_iterator(const path& p) {
+    if (!exists(p) || !is_directory(p))
+        return {};
+
+    std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(p.string().c_str()), &closedir);
+    if (!dir) {
+        ALOGE("Failed to open %s directory", p.string().c_str());
+    }
+
+    std::vector<directory_entry> out;
+    struct dirent* dent;
+    while ((dent = readdir(dir.get()))) {
+        if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
+            continue;
+
+        std::stringstream ss(p.string());
+        ss << "/" << dent->d_name;
+        out.emplace_back(ss.str());
+    }
+
+    return out;
+}
+
+} // namespace filesystem
diff --git a/aidl/memtrack/core/filesystem.h b/aidl/memtrack/core/filesystem.h
new file mode 100644
index 0000000..4603223
--- /dev/null
+++ b/aidl/memtrack/core/filesystem.h
@@ -0,0 +1,60 @@
+// TODO(b/147469372): filesystem library in Android's libcxx is not available
+// for vendors. It had an unstable ABI and libcxx isn't updated ever since.
+
+// This simply implements some of the required functions in not-so-safe fashion.
+
+#pragma once
+
+#include <dirent.h>
+#include <log/log.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <string>
+#include <vector>
+
+namespace filesystem {
+class path {
+public:
+    path(const std::string _path) : strPath(_path) {}
+
+    path filename() const {
+        auto pos = strPath.rfind('/');
+        if (pos == std::string::npos)
+            return path(strPath);
+
+        pos++;
+        auto l = strPath.size();
+        return path(strPath.substr(pos, l - pos));
+    }
+
+    std::string string() const { return strPath; }
+
+private:
+    std::string strPath;
+};
+
+class directory_entry {
+public:
+    directory_entry(const std::string _path) : p(_path) {}
+
+    class path path() {
+        return p;
+    }
+
+private:
+    class path p;
+};
+
+bool exists(const path& p);
+
+bool is_directory(const path& p);
+
+bool is_symlink(const path& p);
+
+path read_symlink(const path& p);
+
+// Vector is easier to create than an iterator and serves our purposes well
+std::vector<directory_entry> directory_iterator(const path& p);
+} // namespace filesystem
diff --git a/aidl/memtrack/core/include/Memtrack.h b/aidl/memtrack/core/include/Memtrack.h
new file mode 100644
index 0000000..afd0660
--- /dev/null
+++ b/aidl/memtrack/core/include/Memtrack.h
@@ -0,0 +1,25 @@
+
+#pragma once
+
+#include <aidl/android/hardware/memtrack/BnMemtrack.h>
+#include <aidl/android/hardware/memtrack/DeviceInfo.h>
+#include <aidl/android/hardware/memtrack/MemtrackRecord.h>
+#include <aidl/android/hardware/memtrack/MemtrackType.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace memtrack {
+
+class Memtrack : public BnMemtrack {
+public:
+    ndk::ScopedAStatus getMemory(int pid, MemtrackType type,
+                                 std::vector<MemtrackRecord>* _aidl_return) override;
+
+    ndk::ScopedAStatus getGpuDeviceInfo(std::vector<DeviceInfo>* _aidl_return) override;
+};
+
+} // namespace memtrack
+} // namespace hardware
+} // namespace android
+} // namespace aidl
diff --git a/aidl/memtrack/service/Android.bp b/aidl/memtrack/service/Android.bp
new file mode 100644
index 0000000..f408496
--- /dev/null
+++ b/aidl/memtrack/service/Android.bp
@@ -0,0 +1,20 @@
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+cc_binary {
+    name: "android.hardware.memtrack-service.pixel",
+    relative_install_path: "hw",
+    init_rc: ["memtrack.rc"],
+    vintf_fragments: ["memtrack.xml"],
+    vendor: true,
+    shared_libs: [
+        "android.hardware.memtrack-V1-ndk",
+        "libbase",
+        "libbinder_ndk",
+        "libmemtrack-pixel",
+    ],
+    srcs: [
+        "main.cpp",
+    ],
+}
diff --git a/aidl/memtrack/service/main.cpp b/aidl/memtrack/service/main.cpp
new file mode 100644
index 0000000..facc4c1
--- /dev/null
+++ b/aidl/memtrack/service/main.cpp
@@ -0,0 +1,22 @@
+#include <Memtrack.h>
+#include <android-base/logging.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+#undef LOG_TAG
+#define LOG_TAG "memtrack-service"
+
+using aidl::android::hardware::memtrack::Memtrack;
+
+int main() {
+    ABinderProcess_setThreadPoolMaxThreadCount(0);
+    std::shared_ptr<Memtrack> memtrack = ndk::SharedRefBase::make<Memtrack>();
+
+    const std::string instance = std::string() + Memtrack::descriptor + "/default";
+    binder_status_t status =
+            AServiceManager_addService(memtrack->asBinder().get(), instance.c_str());
+    CHECK(status == STATUS_OK);
+
+    ABinderProcess_joinThreadPool();
+    return EXIT_FAILURE; // Unreachable
+}
diff --git a/aidl/memtrack/service/memtrack.rc b/aidl/memtrack/service/memtrack.rc
new file mode 100644
index 0000000..02f5a69
--- /dev/null
+++ b/aidl/memtrack/service/memtrack.rc
@@ -0,0 +1,4 @@
+service vendor.memtrack-default /vendor/bin/hw/android.hardware.memtrack-service.pixel
+    class hal
+    user graphics
+    group system
diff --git a/aidl/memtrack/service/memtrack.xml b/aidl/memtrack/service/memtrack.xml
new file mode 100644
index 0000000..3e3e0f6
--- /dev/null
+++ b/aidl/memtrack/service/memtrack.xml
@@ -0,0 +1,7 @@
+<manifest version="1.0" type="device">
+    <hal format="aidl">
+        <name>android.hardware.memtrack</name>
+        <fqname>IMemtrack/default</fqname>
+    </hal>
+</manifest>
+