Offload switchUser calls to worker threads

Some switchUser callbacks can block ActivityManager thread for 100+ ms.
The work can be done on a worker thread instead.

Test: Manual create/switch to user
Bug: 37579992
Change-Id: I45034fa8c8bdf457bcc3737c8064057fbfaf32f5

2 files changed, 15 insertions, 8 deletions

diff --git a/services/core/java/com/android/server/vr/VrManagerService.java b/services/core/java/com/android/server/vr/VrManagerService.java
index 21c688907dc1..de723c6701d3 100644
--- a/services/core/java/com/android/server/vr/VrManagerService.java
+++ b/services/core/java/com/android/server/vr/VrManagerService.java
@@ -59,6 +59,8 @@ import android.util.ArrayMap;
 import android.util.ArraySet;
 import android.util.Slog;
 import android.util.SparseArray;
+
+import com.android.server.FgThread;
 import com.android.server.wm.WindowManagerInternal;
 import android.view.inputmethod.InputMethodManagerInternal;
 
@@ -825,9 +827,11 @@ public class VrManagerService extends SystemService
 
     @Override
     public void onSwitchUser(int userHandle) {
-        synchronized (mLock) {
-            mComponentObserver.onUsersChanged();
-        }
+        FgThread.getHandler().post(() -> {
+            synchronized (mLock) {
+                mComponentObserver.onUsersChanged();
+            }
+        });
 
     }
 
diff --git a/services/voiceinteraction/java/com/android/server/voiceinteraction/VoiceInteractionManagerService.java b/services/voiceinteraction/java/com/android/server/voiceinteraction/VoiceInteractionManagerService.java
index c0685f927398..44f55511f940 100644
--- a/services/voiceinteraction/java/com/android/server/voiceinteraction/VoiceInteractionManagerService.java
+++ b/services/voiceinteraction/java/com/android/server/voiceinteraction/VoiceInteractionManagerService.java
@@ -67,6 +67,7 @@ import com.android.internal.content.PackageMonitor;
 import com.android.internal.os.BackgroundThread;
 import com.android.internal.util.DumpUtils;
 import com.android.internal.util.Preconditions;
+import com.android.server.FgThread;
 import com.android.server.LocalServices;
 import com.android.server.SystemService;
 import com.android.server.UiThread;
@@ -389,11 +390,13 @@ public class VoiceInteractionManagerService extends SystemService {
         }
 
         public void switchUser(int userHandle) {
-            synchronized (this) {
-                mCurUser = userHandle;
-                mCurUserUnlocked = false;
-                switchImplementationIfNeededLocked(false);
-            }
+            FgThread.getHandler().post(() -> {
+                synchronized (this) {
+                    mCurUser = userHandle;
+                    mCurUserUnlocked = false;
+                    switchImplementationIfNeededLocked(false);
+                }
+            });
         }
 
         void switchImplementationIfNeeded(boolean force) {