diff --git a/core/java/android/app/ActivityThread.java b/core/java/android/app/ActivityThread.java
index b4cabada05228..98683f0bd87a8 100644
--- a/core/java/android/app/ActivityThread.java
+++ b/core/java/android/app/ActivityThread.java
@@ -3410,26 +3410,12 @@ public final class ActivityThread extends ClientTransactionHandler
         }
     }
 
-    /**
-     * Returns {@code true} if the {@link android.app.ActivityManager.ProcessState} of the current
-     * process is cached.
-     */
-    @Override
-    @VisibleForTesting
-    public boolean isCachedProcessState() {
-        synchronized (mAppThread) {
-            return mLastProcessState >= ActivityManager.PROCESS_STATE_CACHED_ACTIVITY;
-        }
-    }
-
     @Override
     public void updateProcessState(int processState, boolean fromIpc) {
-        final boolean wasCached;
         synchronized (mAppThread) {
             if (mLastProcessState == processState) {
                 return;
             }
-            wasCached = isCachedProcessState();
             mLastProcessState = processState;
             // Defer the top state for VM to avoid aggressive JIT compilation affecting activity
             // launch time.
@@ -3446,22 +3432,6 @@ public final class ActivityThread extends ClientTransactionHandler
                         + (fromIpc ? " (from ipc" : ""));
             }
         }
-
-        // Handle the pending configuration if the process state is changed from cached to
-        // non-cached. Except the case where there is a launching activity because the
-        // LaunchActivityItem will handle it.
-        if (wasCached && !isCachedProcessState() && mNumLaunchingActivities.get() == 0) {
-            final Configuration pendingConfig =
-                    mConfigurationController.getPendingConfiguration(false /* clearPending */);
-            if (pendingConfig == null) {
-                return;
-            }
-            if (Looper.myLooper() == mH.getLooper()) {
-                handleConfigurationChanged(pendingConfig);
-            } else {
-                sendMessage(H.CONFIGURATION_CHANGED, pendingConfig);
-            }
-        }
     }
 
     /** Update VM state based on ActivityManager.PROCESS_STATE_* constants. */
diff --git a/core/java/android/app/ActivityThreadInternal.java b/core/java/android/app/ActivityThreadInternal.java
index b9ad5c3378137..72506b9fcdbbd 100644
--- a/core/java/android/app/ActivityThreadInternal.java
+++ b/core/java/android/app/ActivityThreadInternal.java
@@ -32,8 +32,6 @@ interface ActivityThreadInternal {
 
     boolean isInDensityCompatMode();
 
-    boolean isCachedProcessState();
-
     Application getApplication();
 
     ArrayList<ComponentCallbacks2> collectComponentCallbacks(boolean includeUiContexts);
diff --git a/core/java/android/app/ConfigurationController.java b/core/java/android/app/ConfigurationController.java
index 1a77b65c8ef6b..18dc1ce18bafb 100644
--- a/core/java/android/app/ConfigurationController.java
+++ b/core/java/android/app/ConfigurationController.java
@@ -124,12 +124,6 @@ class ConfigurationController {
      * @param config The new configuration.
      */
     void handleConfigurationChanged(@NonNull Configuration config) {
-        if (mActivityThread.isCachedProcessState()) {
-            updatePendingConfiguration(config);
-            // If the process is in a cached state, delay the handling until the process is no
-            // longer cached.
-            return;
-        }
         Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "configChanged");
         handleConfigurationChanged(config, null /* compat */);
         Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
diff --git a/core/tests/coretests/src/android/app/activity/ActivityThreadTest.java b/core/tests/coretests/src/android/app/activity/ActivityThreadTest.java
index bfb2fd57975f8..a2d4bafef41cd 100644
--- a/core/tests/coretests/src/android/app/activity/ActivityThreadTest.java
+++ b/core/tests/coretests/src/android/app/activity/ActivityThreadTest.java
@@ -31,7 +31,6 @@ import static org.junit.Assert.assertTrue;
 
 import android.annotation.Nullable;
 import android.app.Activity;
-import android.app.ActivityManager;
 import android.app.ActivityThread;
 import android.app.ActivityThread.ActivityClientRecord;
 import android.app.IApplicationThread;
@@ -570,53 +569,6 @@ public class ActivityThreadTest {
         });
     }
 
-    @Test
-    public void testHandleProcessConfigurationChanged_DependOnProcessState() {
-        final ActivityThread activityThread = ActivityThread.currentActivityThread();
-        final Configuration origConfig = activityThread.getConfiguration();
-        final int newDpi = origConfig.densityDpi + 10;
-        final Configuration newConfig = new Configuration(origConfig);
-        newConfig.seq++;
-        newConfig.densityDpi = newDpi;
-
-        activityThread.updateProcessState(ActivityManager.PROCESS_STATE_CACHED_ACTIVITY,
-                false /* fromIPC */);
-
-        applyProcessConfiguration(activityThread, newConfig);
-        try {
-            // In the cached state, the configuration is only set as pending and not applied.
-            assertEquals(origConfig.densityDpi, activityThread.getConfiguration().densityDpi);
-            assertTrue(activityThread.isCachedProcessState());
-        } finally {
-            // The foreground state is the default state of instrumentation.
-            activityThread.updateProcessState(ActivityManager.PROCESS_STATE_FOREGROUND_SERVICE,
-                    false /* fromIPC */);
-        }
-        InstrumentationRegistry.getInstrumentation().waitForIdleSync();
-
-        try {
-            // The state becomes non-cached, the pending configuration should be applied.
-            assertEquals(newConfig.densityDpi, activityThread.getConfiguration().densityDpi);
-            assertFalse(activityThread.isCachedProcessState());
-        } finally {
-            // Restore to the original configuration.
-            activityThread.getConfiguration().seq = origConfig.seq - 1;
-            applyProcessConfiguration(activityThread, origConfig);
-        }
-    }
-
-    private static void applyProcessConfiguration(ActivityThread thread, Configuration config) {
-        final ClientTransaction clientTransaction = newTransaction(thread,
-                null /* activityToken */);
-        clientTransaction.addCallback(ConfigurationChangeItem.obtain(config));
-        final IApplicationThread appThread = thread.getApplicationThread();
-        try {
-            appThread.scheduleTransaction(clientTransaction);
-        } catch (Exception ignored) {
-        }
-        InstrumentationRegistry.getInstrumentation().waitForIdleSync();
-    }
-
     @Test
     public void testResumeAfterNewIntent() {
         final Activity activity = mActivityTestRule.launchActivity(new Intent());
diff --git a/services/core/java/com/android/server/wm/WindowProcessController.java b/services/core/java/com/android/server/wm/WindowProcessController.java
index 40417a4857d3d..1c64a06036f0b 100644
--- a/services/core/java/com/android/server/wm/WindowProcessController.java
+++ b/services/core/java/com/android/server/wm/WindowProcessController.java
@@ -16,6 +16,7 @@
 
 package com.android.server.wm;
 
+import static android.app.ActivityManager.PROCESS_STATE_CACHED_ACTIVITY;
 import static android.app.ActivityManager.PROCESS_STATE_NONEXISTENT;
 import static android.app.WindowConfiguration.ACTIVITY_TYPE_UNDEFINED;
 import static android.content.res.Configuration.ASSETS_SEQ_UNDEFINED;
@@ -195,6 +196,11 @@ public class WindowProcessController extends ConfigurationContainer<Configuratio
     /** Whether the process configuration is waiting to be dispatched to the process. */
     private boolean mHasPendingConfigurationChange;
 
+    /** If the process state is in (<=) the cached state, then defer delivery of the config. */
+    private static final int CACHED_CONFIG_PROC_STATE = PROCESS_STATE_CACHED_ACTIVITY;
+    /** Whether {@link #mLastReportedConfiguration} is deferred by the cached state. */
+    private volatile boolean mHasCachedConfiguration;
+
     /**
      * Registered {@link DisplayArea} as a listener to override config changes. {@code null} if not
      * registered.
@@ -316,8 +322,27 @@ public class WindowProcessController extends ConfigurationContainer<Configuratio
         return mCurProcState;
     }
 
+    /**
+     * Sets the computed process state from the oom adjustment calculation. This is frequently
+     * called in activity manager's lock, so don't use window manager lock here.
+     */
+    @HotPath(caller = HotPath.OOM_ADJUSTMENT)
     public void setReportedProcState(int repProcState) {
+        final int prevProcState = mRepProcState;
         mRepProcState = repProcState;
+
+        // Deliver the cached config if the app changes from cached state to non-cached state.
+        final IApplicationThread thread = mThread;
+        if (prevProcState >= CACHED_CONFIG_PROC_STATE && repProcState < CACHED_CONFIG_PROC_STATE
+                && thread != null && mHasCachedConfiguration) {
+            final Configuration config;
+            synchronized (mLastReportedConfiguration) {
+                config = new Configuration(mLastReportedConfiguration);
+            }
+            // Schedule immediately to make sure the app component (e.g. receiver, service) can get
+            // the latest configuration in their lifecycle callbacks (e.g. onReceive, onCreate).
+            scheduleConfigurationChange(thread, config);
+        }
     }
 
     int getReportedProcState() {
@@ -1328,12 +1353,22 @@ public class WindowProcessController extends ConfigurationContainer<Configuratio
     @Override
     public void onConfigurationChanged(Configuration newGlobalConfig) {
         super.onConfigurationChanged(newGlobalConfig);
-        updateConfiguration();
-    }
+        final Configuration config = getConfiguration();
+        if (mLastReportedConfiguration.equals(config)) {
+            // Nothing changed.
+            if (Build.IS_DEBUGGABLE && mHasImeService) {
+                // TODO (b/135719017): Temporary log for debugging IME service.
+                Slog.w(TAG_CONFIGURATION, "Current config: " + config
+                        + " unchanged for IME proc " + mName);
+            }
+            return;
+        }
 
-    @Override
-    public void onRequestedOverrideConfigurationChanged(Configuration overrideConfiguration) {
-        super.onRequestedOverrideConfigurationChanged(overrideConfiguration);
+        if (mPauseConfigurationDispatchCount > 0) {
+            mHasPendingConfigurationChange = true;
+            return;
+        }
+        dispatchConfiguration(config);
     }
 
     @Override
@@ -1359,25 +1394,6 @@ public class WindowProcessController extends ConfigurationContainer<Configuratio
         resolvedConfig.seq = newParentConfig.seq;
     }
 
-    private void updateConfiguration() {
-        final Configuration config = getConfiguration();
-        if (mLastReportedConfiguration.diff(config) == 0) {
-            // Nothing changed.
-            if (Build.IS_DEBUGGABLE && mHasImeService) {
-                // TODO (b/135719017): Temporary log for debugging IME service.
-                Slog.w(TAG_CONFIGURATION, "Current config: " + config
-                        + " unchanged for IME proc " + mName);
-            }
-            return;
-        }
-
-        if (mPauseConfigurationDispatchCount > 0) {
-            mHasPendingConfigurationChange = true;
-            return;
-        }
-        dispatchConfiguration(config);
-    }
-
     void dispatchConfiguration(Configuration config) {
         mHasPendingConfigurationChange = false;
         if (mThread == null) {
@@ -1388,29 +1404,47 @@ public class WindowProcessController extends ConfigurationContainer<Configuratio
             }
             return;
         }
+
+        config.seq = mAtm.increaseConfigurationSeqLocked();
+        setLastReportedConfiguration(config);
+
+        // A cached process doesn't have running application components, so it is unnecessary to
+        // notify the configuration change. The last-reported-configuration is still set because
+        // setReportedProcState() should not write any fields that require WM lock.
+        if (mRepProcState >= CACHED_CONFIG_PROC_STATE) {
+            mHasCachedConfiguration = true;
+            // Because there are 2 volatile accesses in setReportedProcState(): mRepProcState and
+            // mHasCachedConfiguration, check again in case mRepProcState is changed but hasn't
+            // read the change of mHasCachedConfiguration.
+            if (mRepProcState >= CACHED_CONFIG_PROC_STATE) {
+                return;
+            }
+        }
+
+        scheduleConfigurationChange(mThread, config);
+    }
+
+    private void scheduleConfigurationChange(IApplicationThread thread, Configuration config) {
         ProtoLog.v(WM_DEBUG_CONFIGURATION, "Sending to proc %s new config %s", mName,
                 config);
         if (Build.IS_DEBUGGABLE && mHasImeService) {
             // TODO (b/135719017): Temporary log for debugging IME service.
             Slog.v(TAG_CONFIGURATION, "Sending to IME proc " + mName + " new config " + config);
         }
-
+        mHasCachedConfiguration = false;
         try {
-            config.seq = mAtm.increaseConfigurationSeqLocked();
-            mAtm.getLifecycleManager().scheduleTransaction(mThread,
+            mAtm.getLifecycleManager().scheduleTransaction(thread,
                     ConfigurationChangeItem.obtain(config));
-            setLastReportedConfiguration(config);
         } catch (Exception e) {
-            Slog.e(TAG_CONFIGURATION, "Failed to schedule configuration change", e);
+            Slog.e(TAG_CONFIGURATION, "Failed to schedule configuration change: " + mOwner, e);
         }
     }
 
     void setLastReportedConfiguration(Configuration config) {
-        mLastReportedConfiguration.setTo(config);
-    }
-
-    Configuration getLastReportedConfiguration() {
-        return mLastReportedConfiguration;
+        // Synchronize for the access from setReportedProcState().
+        synchronized (mLastReportedConfiguration) {
+            mLastReportedConfiguration.setTo(config);
+        }
     }
 
     void pauseConfigurationDispatch() {
@@ -1461,6 +1495,8 @@ public class WindowProcessController extends ConfigurationContainer<Configuratio
             // config seq. This increment ensures that the client won't ignore the configuration.
             config.seq = mAtm.increaseConfigurationSeqLocked();
         }
+        // LaunchActivityItem includes the latest process configuration.
+        mHasCachedConfiguration = false;
         return config;
     }
 
@@ -1688,7 +1724,8 @@ public class WindowProcessController extends ConfigurationContainer<Configuratio
         }
         pw.println(prefix + " Configuration=" + getConfiguration());
         pw.println(prefix + " OverrideConfiguration=" + getRequestedOverrideConfiguration());
-        pw.println(prefix + " mLastReportedConfiguration=" + mLastReportedConfiguration);
+        pw.println(prefix + " mLastReportedConfiguration=" + (mHasCachedConfiguration
+                ? ("(cached) " + mLastReportedConfiguration) : mLastReportedConfiguration));
 
         final int stateFlags = mActivityStateFlags;
         if (stateFlags != ACTIVITY_STATE_FLAG_MASK_MIN_TASK_LAYER) {
diff --git a/services/tests/wmtests/src/com/android/server/wm/WindowProcessControllerTests.java b/services/tests/wmtests/src/com/android/server/wm/WindowProcessControllerTests.java
index 746f2b50ac3a5..3abf7ce665ae7 100644
--- a/services/tests/wmtests/src/com/android/server/wm/WindowProcessControllerTests.java
+++ b/services/tests/wmtests/src/com/android/server/wm/WindowProcessControllerTests.java
@@ -21,6 +21,7 @@ import static android.app.WindowConfiguration.ACTIVITY_TYPE_UNDEFINED;
 import static android.content.res.Configuration.ORIENTATION_LANDSCAPE;
 import static android.content.res.Configuration.ORIENTATION_PORTRAIT;
 
+import static com.android.dx.mockito.inline.extended.ExtendedMockito.doNothing;
 import static com.android.dx.mockito.inline.extended.ExtendedMockito.never;
 import static com.android.dx.mockito.inline.extended.ExtendedMockito.spyOn;
 import static com.android.dx.mockito.inline.extended.ExtendedMockito.verify;
@@ -39,24 +40,30 @@ import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyBoolean;
 import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.clearInvocations;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.when;
 
 import android.Manifest;
+import android.app.ActivityManager;
+import android.app.ClientTransactionHandler;
 import android.app.IApplicationThread;
+import android.app.servertransaction.ConfigurationChangeItem;
 import android.content.ComponentName;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.ServiceInfo;
 import android.content.res.Configuration;
 import android.graphics.Rect;
 import android.os.LocaleList;
+import android.os.RemoteException;
 import android.platform.test.annotations.Presubmit;
 
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
 import org.mockito.InOrder;
 import org.mockito.Mockito;
 
@@ -281,6 +288,39 @@ public class WindowProcessControllerTests extends WindowTestsBase {
                 mWpc.getConfiguration().seq, globalSeq);
     }
 
+    @Test
+    public void testCachedStateConfigurationChange() throws RemoteException {
+        final ClientLifecycleManager clientManager = mAtm.getLifecycleManager();
+        doNothing().when(clientManager).scheduleTransaction(any(), any());
+        final IApplicationThread thread = mWpc.getThread();
+        final Configuration newConfig = new Configuration(mWpc.getConfiguration());
+        newConfig.densityDpi += 100;
+        // Non-cached state will send the change directly.
+        mWpc.setReportedProcState(ActivityManager.PROCESS_STATE_IMPORTANT_BACKGROUND);
+        clearInvocations(clientManager);
+        mWpc.onConfigurationChanged(newConfig);
+        verify(clientManager).scheduleTransaction(eq(thread), any());
+
+        // Cached state won't send the change.
+        clearInvocations(clientManager);
+        mWpc.setReportedProcState(ActivityManager.PROCESS_STATE_CACHED_ACTIVITY);
+        newConfig.densityDpi += 100;
+        mWpc.onConfigurationChanged(newConfig);
+        verify(clientManager, never()).scheduleTransaction(eq(thread), any());
+
+        // Cached -> non-cached will send the previous deferred config immediately.
+        mWpc.setReportedProcState(ActivityManager.PROCESS_STATE_RECEIVER);
+        final ArgumentCaptor<ConfigurationChangeItem> captor =
+                ArgumentCaptor.forClass(ConfigurationChangeItem.class);
+        verify(clientManager).scheduleTransaction(eq(thread), captor.capture());
+        final ClientTransactionHandler client = mock(ClientTransactionHandler.class);
+        captor.getValue().preExecute(client, null /* token */);
+        final ArgumentCaptor<Configuration> configCaptor =
+                ArgumentCaptor.forClass(Configuration.class);
+        verify(client).updatePendingConfiguration(configCaptor.capture());
+        assertEquals(newConfig, configCaptor.getValue());
+    }
+
     @Test
     public void testComputeOomAdjFromActivities() {
         final ActivityRecord activity = createActivityRecord(mWpc);