diff --git a/tests/benchmark/src/java/com/android/microdroid/benchmark/MicrodroidBenchmarks.java b/tests/benchmark/src/java/com/android/microdroid/benchmark/MicrodroidBenchmarks.java
index 7ee2d39..90aac1e 100644
--- a/tests/benchmark/src/java/com/android/microdroid/benchmark/MicrodroidBenchmarks.java
+++ b/tests/benchmark/src/java/com/android/microdroid/benchmark/MicrodroidBenchmarks.java
@@ -122,37 +122,34 @@
 
         final int trialCount = 10;
 
-        double sum = 0;
-        double squareSum = 0;
-        double min = Double.MAX_VALUE;
-        double max = Double.MIN_VALUE;
+        List<Double> bootTimeMetrics = new ArrayList<>();
+        List<Double> bootloaderTimeMetrics = new ArrayList<>();
+        List<Double> kernelBootTimeMetrics = new ArrayList<>();
+        List<Double> userspaceBootTimeMetrics = new ArrayList<>();
+
         for (int i = 0; i < trialCount; i++) {
             VirtualMachineConfig.Builder builder =
                     mInner.newVmConfigBuilder("assets/vm_config.json");
+
+            // To grab boot events from log, set debug mode to FULL
             VirtualMachineConfig normalConfig =
-                    builder.debugLevel(DebugLevel.NONE).memoryMib(256).build();
+                    builder.debugLevel(DebugLevel.FULL).memoryMib(256).build();
             mInner.forceCreateNewVirtualMachine("test_vm_boot_time", normalConfig);
 
             BootResult result = tryBootVm(TAG, "test_vm_boot_time");
             assertThat(result.payloadStarted).isTrue();
 
-            double elapsedMilliseconds = result.elapsedNanoTime / 1000000.0;
-
-            sum += elapsedMilliseconds;
-            squareSum += elapsedMilliseconds * elapsedMilliseconds;
-            if (min > elapsedMilliseconds) min = elapsedMilliseconds;
-            if (max < elapsedMilliseconds) max = elapsedMilliseconds;
+            final Double nanoToMilli = 1000000.0;
+            bootTimeMetrics.add(result.endToEndNanoTime / nanoToMilli);
+            bootloaderTimeMetrics.add(result.getBootloaderElapsedNanoTime() / nanoToMilli);
+            kernelBootTimeMetrics.add(result.getKernelElapsedNanoTime() / nanoToMilli);
+            userspaceBootTimeMetrics.add(result.getUserspaceElapsedNanoTime() / nanoToMilli);
         }
 
-        Bundle bundle = new Bundle();
-        double average = sum / trialCount;
-        double variance = squareSum / trialCount - average * average;
-        double stdev = Math.sqrt(variance);
-        bundle.putDouble("avf_perf/microdroid/boot_time_average_ms", average);
-        bundle.putDouble("avf_perf/microdroid/boot_time_min_ms", min);
-        bundle.putDouble("avf_perf/microdroid/boot_time_max_ms", max);
-        bundle.putDouble("avf_perf/microdroid/boot_time_stdev_ms", stdev);
-        mInstrumentation.sendStatus(0, bundle);
+        reportMetrics(bootTimeMetrics,          "avf_perf/microdroid/boot_time_",           "_ms");
+        reportMetrics(bootloaderTimeMetrics,    "avf_perf/microdroid/bootloader_time_",     "_ms");
+        reportMetrics(kernelBootTimeMetrics,    "avf_perf/microdroid/kernel_boot_time_",    "_ms");
+        reportMetrics(userspaceBootTimeMetrics, "avf_perf/microdroid/userspace_boot_time_", "_ms");
     }
 
     @Test
@@ -199,30 +196,36 @@
             VirtioBlkVmEventListener listener = new VirtioBlkVmEventListener(readRates, isRand);
             listener.runToFinish(TAG, vm);
         }
-        reportMetrics(readRates, isRand);
-    }
 
-    private void reportMetrics(List<Double> readRates, boolean isRand) {
-        double sum = 0;
-        for (double rate : readRates) {
-            sum += rate;
-        }
-        double mean = sum / readRates.size();
-        double sqSum = 0;
-        for (double rate : readRates) {
-            sqSum += (rate - mean) * (rate - mean);
-        }
-        double stdDev = Math.sqrt(sqSum / (readRates.size() - 1));
-
-        Bundle bundle = new Bundle();
         String metricNamePrefix =
                 "avf_perf/virtio-blk/"
                         + (mProtectedVm ? "protected-vm/" : "unprotected-vm/")
                         + (isRand ? "rand_read_" : "seq_read_");
         String unit = "_mb_per_sec";
+        reportMetrics(readRates, metricNamePrefix, unit);
+    }
 
-        bundle.putDouble(metricNamePrefix + "mean" + unit, mean);
-        bundle.putDouble(metricNamePrefix + "std" + unit, stdDev);
+    private void reportMetrics(List<Double> data, String prefix, String suffix) {
+        double sum = 0;
+        double min = Double.MAX_VALUE;
+        double max = Double.MIN_VALUE;
+        for (double d : data) {
+            sum += d;
+            if (min > d) min = d;
+            if (max < d) max = d;
+        }
+        double avg = sum / data.size();
+        double sqSum = 0;
+        for (double d : data) {
+            sqSum += (d - avg) * (d - avg);
+        }
+        double stdDev = Math.sqrt(sqSum / (data.size() - 1));
+
+        Bundle bundle = new Bundle();
+        bundle.putDouble(prefix + "min" + suffix, min);
+        bundle.putDouble(prefix + "max" + suffix, max);
+        bundle.putDouble(prefix + "average" + suffix, avg);
+        bundle.putDouble(prefix + "stdev" + suffix, stdDev);
         mInstrumentation.sendStatus(0, bundle);
     }
 
diff --git a/tests/helper/src/java/com/android/microdroid/test/MicrodroidDeviceTestBase.java b/tests/helper/src/java/com/android/microdroid/test/MicrodroidDeviceTestBase.java
index 1f57634..84e189a 100644
--- a/tests/helper/src/java/com/android/microdroid/test/MicrodroidDeviceTestBase.java
+++ b/tests/helper/src/java/com/android/microdroid/test/MicrodroidDeviceTestBase.java
@@ -39,30 +39,13 @@
 import java.io.BufferedReader;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.util.OptionalLong;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 
 public abstract class MicrodroidDeviceTestBase {
-    /** Copy output from the VM to logcat. This is helpful when things go wrong. */
-    protected static void logVmOutput(String tag, InputStream vmOutputStream, String name) {
-        new Thread(
-                () -> {
-                    try {
-                        BufferedReader reader =
-                                new BufferedReader(new InputStreamReader(vmOutputStream));
-                        String line;
-                        while ((line = reader.readLine()) != null
-                                && !Thread.interrupted()) {
-                            Log.i(tag, name + ": " + line);
-                        }
-                    } catch (Exception e) {
-                        Log.w(tag, name, e);
-                    }
-                }).start();
-    }
-
     public static boolean isCuttlefish() {
         return VirtualizationTestHelper.isCuttlefish(SystemProperties.get("ro.product.name"));
     }
@@ -138,16 +121,84 @@
 
     protected abstract static class VmEventListener implements VirtualMachineCallback {
         private ExecutorService mExecutorService = Executors.newSingleThreadExecutor();
+        private OptionalLong mVcpuStartedNanoTime = OptionalLong.empty();
+        private OptionalLong mKernelStartedNanoTime = OptionalLong.empty();
+        private OptionalLong mInitStartedNanoTime = OptionalLong.empty();
+        private OptionalLong mPayloadStartedNanoTime = OptionalLong.empty();
+
+        private void processBootEvents(String log) {
+            if (!mVcpuStartedNanoTime.isPresent()) {
+                mVcpuStartedNanoTime = OptionalLong.of(System.nanoTime());
+            }
+            if (log.contains("Starting kernel") && !mKernelStartedNanoTime.isPresent()) {
+                mKernelStartedNanoTime = OptionalLong.of(System.nanoTime());
+            }
+            if (log.contains("Run /init as init process") && !mInitStartedNanoTime.isPresent()) {
+                mInitStartedNanoTime = OptionalLong.of(System.nanoTime());
+            }
+            if (log.contains("microdroid_manager") && log.contains("executing main task")
+                    && !mPayloadStartedNanoTime.isPresent()) {
+                mPayloadStartedNanoTime = OptionalLong.of(System.nanoTime());
+            }
+        }
+
+        private void logVmOutputAndMonitorBootEvents(String tag,
+                InputStream vmOutputStream,
+                String name,
+                boolean monitorEvents) {
+            new Thread(
+                    () -> {
+                        try {
+                            BufferedReader reader =
+                                    new BufferedReader(new InputStreamReader(vmOutputStream));
+                            String line;
+                            while ((line = reader.readLine()) != null
+                                    && !Thread.interrupted()) {
+                                if (monitorEvents) processBootEvents(line);
+                                Log.i(tag, name + ": " + line);
+                            }
+                        } catch (Exception e) {
+                            Log.w(tag, name, e);
+                        }
+                    }).start();
+        }
+
+        private void logVmOutputAndMonitorBootEvents(String tag,
+                InputStream vmOutputStream,
+                String name) {
+            logVmOutputAndMonitorBootEvents(tag, vmOutputStream, name, true);
+        }
+
+        /** Copy output from the VM to logcat. This is helpful when things go wrong. */
+        protected void logVmOutput(String tag, InputStream vmOutputStream, String name) {
+            logVmOutputAndMonitorBootEvents(tag, vmOutputStream, name, false);
+        }
 
         public void runToFinish(String logTag, VirtualMachine vm)
                 throws VirtualMachineException, InterruptedException {
             vm.setCallback(mExecutorService, this);
             vm.run();
-            logVmOutput(logTag, vm.getConsoleOutputStream(), "Console");
+            logVmOutputAndMonitorBootEvents(logTag, vm.getConsoleOutputStream(), "Console");
             logVmOutput(logTag, vm.getLogOutputStream(), "Log");
             mExecutorService.awaitTermination(300, TimeUnit.SECONDS);
         }
 
+        public OptionalLong getVcpuStartedNanoTime() {
+            return mVcpuStartedNanoTime;
+        }
+
+        public OptionalLong getKernelStartedNanoTime() {
+            return mKernelStartedNanoTime;
+        }
+
+        public OptionalLong getInitStartedNanoTime() {
+            return mInitStartedNanoTime;
+        }
+
+        public OptionalLong getPayloadStartedNanoTime() {
+            return mPayloadStartedNanoTime;
+        }
+
         protected void forceStop(VirtualMachine vm) {
             try {
                 vm.clearCallback();
@@ -183,12 +234,55 @@
     public static class BootResult {
         public final boolean payloadStarted;
         public final int deathReason;
-        public final long elapsedNanoTime;
+        public final long endToEndNanoTime;
 
-        BootResult(boolean payloadStarted, int deathReason, long elapsedNanoTime) {
+        public final OptionalLong vcpuStartedNanoTime;
+        public final OptionalLong kernelStartedNanoTime;
+        public final OptionalLong initStartedNanoTime;
+        public final OptionalLong payloadStartedNanoTime;
+
+        BootResult(boolean payloadStarted,
+                int deathReason,
+                long endToEndNanoTime,
+                OptionalLong vcpuStartedNanoTime,
+                OptionalLong kernelStartedNanoTime,
+                OptionalLong initStartedNanoTime,
+                OptionalLong payloadStartedNanoTime) {
             this.payloadStarted = payloadStarted;
             this.deathReason = deathReason;
-            this.elapsedNanoTime = elapsedNanoTime;
+            this.endToEndNanoTime = endToEndNanoTime;
+            this.vcpuStartedNanoTime = vcpuStartedNanoTime;
+            this.kernelStartedNanoTime = kernelStartedNanoTime;
+            this.initStartedNanoTime = initStartedNanoTime;
+            this.payloadStartedNanoTime = payloadStartedNanoTime;
+        }
+
+        private long getVcpuStartedNanoTime() {
+            return vcpuStartedNanoTime.getAsLong();
+        }
+
+        private long getKernelStartedNanoTime() {
+            return kernelStartedNanoTime.getAsLong();
+        }
+
+        private long getInitStartedNanoTime() {
+            return initStartedNanoTime.getAsLong();
+        }
+
+        private long getPayloadStartedNanoTime() {
+            return payloadStartedNanoTime.getAsLong();
+        }
+
+        public long getBootloaderElapsedNanoTime() {
+            return getKernelStartedNanoTime() - getVcpuStartedNanoTime();
+        }
+
+        public long getKernelElapsedNanoTime() {
+            return getInitStartedNanoTime() - getKernelStartedNanoTime();
+        }
+
+        public long getUserspaceElapsedNanoTime() {
+            return getPayloadStartedNanoTime() - getInitStartedNanoTime();
         }
     }
 
@@ -218,6 +312,10 @@
         return new BootResult(
                 payloadStarted.getNow(false),
                 deathReason.getNow(DeathReason.INFRASTRUCTURE_ERROR),
-                endTime.getNow(beginTime) - beginTime);
+                endTime.getNow(beginTime) - beginTime,
+                listener.getVcpuStartedNanoTime(),
+                listener.getKernelStartedNanoTime(),
+                listener.getInitStartedNanoTime(),
+                listener.getPayloadStartedNanoTime());
     }
 }