diff --git a/core/java/android/os/Bundle.java b/core/java/android/os/Bundle.java
index 9b5ff29d592e5..ec01364b63b48 100644
--- a/core/java/android/os/Bundle.java
+++ b/core/java/android/os/Bundle.java
@@ -259,6 +259,19 @@ public final class Bundle extends BaseBundle implements Cloneable, Parcelable {
         }
     }
 
+    /**
+     * Return the size of {@link #mParcelledData} in bytes if available, otherwise {@code 0}.
+     *
+     * @hide
+     */
+    public int getSize() {
+        if (mParcelledData != null) {
+            return mParcelledData.dataSize();
+        } else {
+            return 0;
+        }
+    }
+
     /**
      * Reports whether the bundle contains any parcelled file descriptors.
      */
diff --git a/services/core/java/com/android/server/am/ActivityStackSupervisor.java b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
index 9fcd5934ec685..17752910edf8c 100644
--- a/services/core/java/com/android/server/am/ActivityStackSupervisor.java
+++ b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
@@ -1461,6 +1461,7 @@ public class ActivityStackSupervisor extends ConfigurationContainer implements D
                     mService.getGlobalConfiguration(), r.getMergedOverrideConfiguration());
             r.setLastReportedConfiguration(mergedConfiguration);
 
+            logIfTransactionTooLarge(r.intent, r.icicle);
             app.thread.scheduleLaunchActivity(new Intent(r.intent), r.appToken,
                     System.identityHashCode(r), r.info,
                     // TODO: Have this take the merged configuration instead of separate global and
@@ -1546,6 +1547,21 @@ public class ActivityStackSupervisor extends ConfigurationContainer implements D
         return true;
     }
 
+    private void logIfTransactionTooLarge(Intent intent, Bundle icicle) {
+        int extrasSize = 0;
+        if (intent != null) {
+            final Bundle extras = intent.getExtras();
+            if (extras != null) {
+                extrasSize = extras.getSize();
+            }
+        }
+        int icicleSize = (icicle == null ? 0 : icicle.getSize());
+        if (extrasSize + icicleSize > 200000) {
+            Slog.e(TAG, "Transaction too large, intent: " + intent + ", extras size: " + extrasSize
+                    + ", icicle size: " + icicleSize);
+        }
+    }
+
     void startSpecificActivityLocked(ActivityRecord r,
             boolean andResume, boolean checkConfig) {
         // Is this activity's application already running?