diff --git a/core/java/android/app/Activity.java b/core/java/android/app/Activity.java
index 83fe4dd..42295ff 100644
--- a/core/java/android/app/Activity.java
+++ b/core/java/android/app/Activity.java
@@ -751,6 +751,14 @@
 
     private static final String KEYBOARD_SHORTCUTS_RECEIVER_PKG_NAME = "com.android.systemui";
 
+    private static final int LOG_AM_ON_CREATE_CALLED = 30057;
+    private static final int LOG_AM_ON_START_CALLED = 30059;
+    private static final int LOG_AM_ON_RESUME_CALLED = 30022;
+    private static final int LOG_AM_ON_PAUSE_CALLED = 30021;
+    private static final int LOG_AM_ON_STOP_CALLED = 30049;
+    private static final int LOG_AM_ON_RESTART_CALLED = 30058;
+    private static final int LOG_AM_ON_DESTROY_CALLED = 30060;
+
     private static class ManagedDialog {
         Dialog mDialog;
         Bundle mArgs;
@@ -7103,6 +7111,7 @@
         } else {
             onCreate(icicle);
         }
+        writeEventLog(LOG_AM_ON_CREATE_CALLED, "performCreate");
         mActivityTransitionState.readState(icicle);
 
         mVisibleFromClient = !mWindow.getWindowStyle().getBoolean(
@@ -7116,12 +7125,14 @@
         onNewIntent(intent);
     }
 
-    final void performStart() {
+    final void performStart(String reason) {
         mActivityTransitionState.setEnterActivityOptions(this, getActivityOptions());
         mFragments.noteStateNotSaved();
         mCalled = false;
         mFragments.execPendingActions();
         mInstrumentation.callActivityOnStart(this);
+        writeEventLog(LOG_AM_ON_START_CALLED, reason);
+
         if (!mCalled) {
             throw new SuperNotCalledException(
                 "Activity " + mComponent.toShortString() +
@@ -7190,7 +7201,7 @@
      *              The option to not start immediately is needed in case a transaction with
      *              multiple lifecycle transitions is in progress.
      */
-    final void performRestart(boolean start) {
+    final void performRestart(boolean start, String reason) {
         mCanEnterPictureInPicture = true;
         mFragments.noteStateNotSaved();
 
@@ -7223,19 +7234,20 @@
 
             mCalled = false;
             mInstrumentation.callActivityOnRestart(this);
+            writeEventLog(LOG_AM_ON_RESTART_CALLED, reason);
             if (!mCalled) {
                 throw new SuperNotCalledException(
                     "Activity " + mComponent.toShortString() +
                     " did not call through to super.onRestart()");
             }
             if (start) {
-                performStart();
+                performStart(reason);
             }
         }
     }
 
-    final void performResume(boolean followedByPause) {
-        performRestart(true /* start */);
+    final void performResume(boolean followedByPause, String reason) {
+        performRestart(true /* start */, reason);
 
         mFragments.execPendingActions();
 
@@ -7254,6 +7266,7 @@
         mCalled = false;
         // mResumed is set by the instrumentation
         mInstrumentation.callActivityOnResume(this);
+        writeEventLog(LOG_AM_ON_RESUME_CALLED, reason);
         if (!mCalled) {
             throw new SuperNotCalledException(
                 "Activity " + mComponent.toShortString() +
@@ -7290,6 +7303,7 @@
         mFragments.dispatchPause();
         mCalled = false;
         onPause();
+        writeEventLog(LOG_AM_ON_PAUSE_CALLED, "performPause");
         mResumed = false;
         if (!mCalled && getApplicationInfo().targetSdkVersion
                 >= android.os.Build.VERSION_CODES.GINGERBREAD) {
@@ -7297,7 +7311,6 @@
                     "Activity " + mComponent.toShortString() +
                     " did not call through to super.onPause()");
         }
-        mResumed = false;
     }
 
     final void performUserLeaving() {
@@ -7305,7 +7318,7 @@
         onUserLeaveHint();
     }
 
-    final void performStop(boolean preserveWindow) {
+    final void performStop(boolean preserveWindow, String reason) {
         mDoReportFullyDrawn = false;
         mFragments.doLoaderStop(mChangingConfigurations /*retain*/);
 
@@ -7328,6 +7341,7 @@
 
             mCalled = false;
             mInstrumentation.callActivityOnStop(this);
+            writeEventLog(LOG_AM_ON_STOP_CALLED, reason);
             if (!mCalled) {
                 throw new SuperNotCalledException(
                     "Activity " + mComponent.toShortString() +
@@ -7355,6 +7369,7 @@
         mWindow.destroy();
         mFragments.dispatchDestroy();
         onDestroy();
+        writeEventLog(LOG_AM_ON_DESTROY_CALLED, "performDestroy");
         mFragments.doLoaderDestroy();
         if (mVoiceInteractor != null) {
             mVoiceInteractor.detachActivity();
@@ -7829,6 +7844,12 @@
         }
     }
 
+    /** Log a lifecycle event for current user id and component class. */
+    private void writeEventLog(int event, String reason) {
+        EventLog.writeEvent(event, UserHandle.myUserId(), getComponentName().getClassName(),
+                reason);
+    }
+
     class HostCallbacks extends FragmentHostCallback<Activity> {
         public HostCallbacks() {
             super(Activity.this /*activity*/);
diff --git a/core/java/android/app/ActivityThread.java b/core/java/android/app/ActivityThread.java
index a69b0ee..f9dbd31 100644
--- a/core/java/android/app/ActivityThread.java
+++ b/core/java/android/app/ActivityThread.java
@@ -208,9 +208,6 @@
     public static final boolean DEBUG_ORDER = false;
     private static final long MIN_TIME_BETWEEN_GCS = 5*1000;
     private static final int SQLITE_MEM_RELEASED_EVENT_LOG_TAG = 75003;
-    private static final int LOG_AM_ON_PAUSE_CALLED = 30021;
-    private static final int LOG_AM_ON_RESUME_CALLED = 30022;
-    private static final int LOG_AM_ON_STOP_CALLED = 30049;
 
     /** Type for IActivityManager.serviceDoneExecuting: anonymous operation */
     public static final int SERVICE_DONE_EXECUTING_ANON = 0;
@@ -2924,7 +2921,7 @@
         }
 
         // Start
-        activity.performStart();
+        activity.performStart("handleStartActivity");
         r.setState(ON_START);
 
         if (pendingActions == null) {
@@ -3113,7 +3110,7 @@
         checkAndBlockForNetworkAccess();
         deliverNewIntents(r, intents);
         if (resumed) {
-            r.activity.performResume(false);
+            r.activity.performResume(false, "performNewIntents");
             r.activity.mTemporaryPause = false;
         }
 
@@ -3735,10 +3732,7 @@
                     deliverResults(r, r.pendingResults);
                     r.pendingResults = null;
                 }
-                r.activity.performResume(r.startsNotResumed);
-
-                EventLog.writeEvent(LOG_AM_ON_RESUME_CALLED, UserHandle.myUserId(),
-                        r.activity.getComponentName().getClassName(), reason);
+                r.activity.performResume(r.startsNotResumed, reason);
 
                 r.state = null;
                 r.persistentState = null;
@@ -3906,7 +3900,8 @@
 
     @Override
     public void handlePauseActivity(IBinder token, boolean finished, boolean userLeaving,
-            int configChanges, boolean dontReport, PendingTransactionActions pendingActions) {
+            int configChanges, boolean dontReport, PendingTransactionActions pendingActions,
+            String reason) {
         ActivityClientRecord r = mActivities.get(token);
         if (r != null) {
             if (userLeaving) {
@@ -3914,7 +3909,7 @@
             }
 
             r.activity.mConfigChangeFlags |= configChanges;
-            performPauseActivity(r, finished, "handlePauseActivity", pendingActions);
+            performPauseActivity(r, finished, reason, pendingActions);
 
             // Make sure any pending writes are now committed.
             if (r.isPreHoneycomb()) {
@@ -4007,8 +4002,6 @@
         try {
             r.activity.mCalled = false;
             mInstrumentation.callActivityOnPause(r.activity);
-            EventLog.writeEvent(LOG_AM_ON_PAUSE_CALLED, UserHandle.myUserId(),
-                    r.activity.getComponentName().getClassName(), reason);
             if (!r.activity.mCalled) {
                 throw new SuperNotCalledException("Activity " + safeToComponentShortString(r.intent)
                         + " did not call through to super.onPause()");
@@ -4119,7 +4112,7 @@
         }
 
         try {
-            r.activity.performStop(false /*preserveWindow*/);
+            r.activity.performStop(false /*preserveWindow*/, reason);
         } catch (SuperNotCalledException e) {
             throw e;
         } catch (Exception e) {
@@ -4131,8 +4124,6 @@
             }
         }
         r.setState(ON_STOP);
-        EventLog.writeEvent(LOG_AM_ON_STOP_CALLED, UserHandle.myUserId(),
-                r.activity.getComponentName().getClassName(), reason);
 
         if (shouldSaveState && !isPreP) {
             callActivityOnSaveInstanceState(r);
@@ -4169,12 +4160,12 @@
 
     @Override
     public void handleStopActivity(IBinder token, boolean show, int configChanges,
-            PendingTransactionActions pendingActions) {
+            PendingTransactionActions pendingActions, String reason) {
         final ActivityClientRecord r = mActivities.get(token);
         r.activity.mConfigChangeFlags |= configChanges;
 
         final StopInfo stopInfo = new StopInfo();
-        performStopActivityInner(r, stopInfo, show, true, "handleStopActivity");
+        performStopActivityInner(r, stopInfo, show, true, reason);
 
         if (localLOGV) Slog.v(
             TAG, "Finishing stop of " + r + ": show=" + show
@@ -4209,7 +4200,7 @@
     public void performRestartActivity(IBinder token, boolean start) {
         ActivityClientRecord r = mActivities.get(token);
         if (r.stopped) {
-            r.activity.performRestart(start);
+            r.activity.performRestart(start, "performRestartActivity");
             if (start) {
                 r.setState(ON_START);
             }
@@ -4232,7 +4223,7 @@
             // we are back active so skip it.
             unscheduleGcIdler();
 
-            r.activity.performRestart(true /* start */);
+            r.activity.performRestart(true /* start */, "handleWindowVisibility");
             r.setState(ON_START);
         }
         if (r.activity.mDecor != null) {
@@ -4272,7 +4263,7 @@
             }
         } else {
             if (r.stopped && r.activity.mVisibleFromServer) {
-                r.activity.performRestart(true /* start */);
+                r.activity.performRestart(true /* start */, "handleSleeping");
                 r.setState(ON_START);
             }
         }
@@ -4384,7 +4375,7 @@
             checkAndBlockForNetworkAccess();
             deliverResults(r, results);
             if (resumed) {
-                r.activity.performResume(false);
+                r.activity.performResume(false, "handleSendResult");
                 r.activity.mTemporaryPause = false;
             }
         }
diff --git a/core/java/android/app/ClientTransactionHandler.java b/core/java/android/app/ClientTransactionHandler.java
index 310965e..cb52a85 100644
--- a/core/java/android/app/ClientTransactionHandler.java
+++ b/core/java/android/app/ClientTransactionHandler.java
@@ -65,7 +65,8 @@
 
     /** Pause the activity. */
     public abstract void handlePauseActivity(IBinder token, boolean finished, boolean userLeaving,
-            int configChanges, boolean dontReport, PendingTransactionActions pendingActions);
+            int configChanges, boolean dontReport, PendingTransactionActions pendingActions,
+            String reason);
 
     /** Resume the activity. */
     public abstract void handleResumeActivity(IBinder token, boolean clearHide, boolean isForward,
@@ -73,7 +74,7 @@
 
     /** Stop the activity. */
     public abstract void handleStopActivity(IBinder token, boolean show, int configChanges,
-            PendingTransactionActions pendingActions);
+            PendingTransactionActions pendingActions, String reason);
 
     /** Report that activity was stopped to server. */
     public abstract void reportStop(PendingTransactionActions pendingActions);
diff --git a/core/java/android/app/servertransaction/PauseActivityItem.java b/core/java/android/app/servertransaction/PauseActivityItem.java
index 91e73cd..578f0e3 100644
--- a/core/java/android/app/servertransaction/PauseActivityItem.java
+++ b/core/java/android/app/servertransaction/PauseActivityItem.java
@@ -43,7 +43,7 @@
             PendingTransactionActions pendingActions) {
         Trace.traceBegin(TRACE_TAG_ACTIVITY_MANAGER, "activityPause");
         client.handlePauseActivity(token, mFinished, mUserLeaving, mConfigChanges, mDontReport,
-                pendingActions);
+                pendingActions, "PAUSE_ACTIVITY_ITEM");
         Trace.traceEnd(TRACE_TAG_ACTIVITY_MANAGER);
     }
 
diff --git a/core/java/android/app/servertransaction/StopActivityItem.java b/core/java/android/app/servertransaction/StopActivityItem.java
index f955a90..0a61fab 100644
--- a/core/java/android/app/servertransaction/StopActivityItem.java
+++ b/core/java/android/app/servertransaction/StopActivityItem.java
@@ -38,7 +38,8 @@
     public void execute(ClientTransactionHandler client, IBinder token,
             PendingTransactionActions pendingActions) {
         Trace.traceBegin(TRACE_TAG_ACTIVITY_MANAGER, "activityStop");
-        client.handleStopActivity(token, mShowWindow, mConfigChanges, pendingActions);
+        client.handleStopActivity(token, mShowWindow, mConfigChanges, pendingActions,
+                "STOP_ACTIVITY_ITEM");
         Trace.traceEnd(TRACE_TAG_ACTIVITY_MANAGER);
     }
 
diff --git a/core/java/android/app/servertransaction/TransactionExecutor.java b/core/java/android/app/servertransaction/TransactionExecutor.java
index 840fef8..b66d61b 100644
--- a/core/java/android/app/servertransaction/TransactionExecutor.java
+++ b/core/java/android/app/servertransaction/TransactionExecutor.java
@@ -186,11 +186,11 @@
                 case ON_PAUSE:
                     mTransactionHandler.handlePauseActivity(r.token, false /* finished */,
                             false /* userLeaving */, 0 /* configChanges */,
-                            true /* dontReport */, mPendingActions);
+                            true /* dontReport */, mPendingActions, "LIFECYCLER_PAUSE_ACTIVITY");
                     break;
                 case ON_STOP:
                     mTransactionHandler.handleStopActivity(r.token, false /* show */,
-                            0 /* configChanges */, mPendingActions);
+                            0 /* configChanges */, mPendingActions, "LIFECYCLER_STOP_ACTIVITY");
                     break;
                 case ON_DESTROY:
                     mTransactionHandler.handleDestroyActivity(r.token, false /* finishing */,
diff --git a/services/core/java/com/android/server/am/EventLogTags.logtags b/services/core/java/com/android/server/am/EventLogTags.logtags
index cb2957d..9caef4a 100644
--- a/services/core/java/com/android/server/am/EventLogTags.logtags
+++ b/services/core/java/com/android/server/am/EventLogTags.logtags
@@ -125,3 +125,12 @@
 30055 am_uid_idle (UID|1|5)
 # Note when a service is being forcibly stopped because its app went idle.
 30056 am_stop_idle_service (UID|1|5),(Component Name|3)
+
+# The activity's onCreate has been called.
+30057 am_on_create_called (User|1|5),(Component Name|3),(Reason|3)
+# The activity's onRestart has been called.
+30058 am_on_restart_called (User|1|5),(Component Name|3),(Reason|3)
+# The activity's onStart has been called.
+30059 am_on_start_called (User|1|5),(Component Name|3),(Reason|3)
+# The activity's onDestroy has been called.
+30060 am_on_destroy_called (User|1|5),(Component Name|3),(Reason|3)
\ No newline at end of file