Set power mode to MODE_FIXED_PERFORMANCE during a user switch.

This reduces average duration of UserController.startUser-fg part
of the user switch by 32% from 269.39ms to 184.65ms.

Bug: 311070231
Bug: 325249845
Test: Run user switch 100 times in a row with flag on and off
Flag: ACONFIG android.multiuser.set_power_mode_during_user_switch DEVELOPMENT
Change-Id: I91c68cbe7dfabdd9dc1d63a9d763040474b02177

1 files changed, 22 insertions, 1 deletions

diff --git a/services/core/java/com/android/server/am/UserController.java b/services/core/java/com/android/server/am/UserController.java
index 55ac4cf37283..34ba7f0debb0 100644
--- a/services/core/java/com/android/server/am/UserController.java
+++ b/services/core/java/com/android/server/am/UserController.java
@@ -97,6 +97,7 @@ import android.os.IProgressListener;
 import android.os.IRemoteCallback;
 import android.os.IUserManager;
 import android.os.Message;
+import android.os.PowerManagerInternal;
 import android.os.PowerWhitelistManager;
 import android.os.Process;
 import android.os.RemoteCallbackList;
@@ -1934,9 +1935,12 @@ class UserController implements Handler.Callback {
     }
 
     /**
-     * Start user, if its not already running, and bring it to foreground.
+     * Start user, if it's not already running, and bring it to foreground.
      */
     void startUserInForeground(@UserIdInt int targetUserId) {
+        if (android.multiuser.Flags.setPowerModeDuringUserSwitch()) {
+            mInjector.setPerformancePowerMode(true);
+        }
         boolean success = startUser(targetUserId, USER_START_MODE_FOREGROUND);
         if (!success) {
             mInjector.getWindowManager().setSwitchingUser(false);
@@ -2146,6 +2150,9 @@ class UserController implements Handler.Callback {
     }
 
     private void endUserSwitch() {
+        if (android.multiuser.Flags.setPowerModeDuringUserSwitch()) {
+            mInjector.setPerformancePowerMode(false);
+        }
         final int nextUserId;
         synchronized (mLock) {
             nextUserId = ObjectUtils.getOrElse(mPendingTargetUserIds.poll(), UserHandle.USER_NULL);
@@ -3535,6 +3542,7 @@ class UserController implements Handler.Callback {
         private final ActivityManagerService mService;
         private UserManagerService mUserManager;
         private UserManagerInternal mUserManagerInternal;
+        private PowerManagerInternal mPowerManagerInternal;
         private Handler mHandler;
         private final Object mUserSwitchingDialogLock = new Object();
         @GuardedBy("mUserSwitchingDialogLock")
@@ -3636,6 +3644,13 @@ class UserController implements Handler.Callback {
             return mUserManagerInternal;
         }
 
+        PowerManagerInternal getPowerManagerInternal() {
+            if (mPowerManagerInternal == null) {
+                mPowerManagerInternal = LocalServices.getService(PowerManagerInternal.class);
+            }
+            return mPowerManagerInternal;
+        }
+
         KeyguardManager getKeyguardManager() {
             return mService.mContext.getSystemService(KeyguardManager.class);
         }
@@ -3829,6 +3844,12 @@ class UserController implements Handler.Callback {
             getSystemServiceManager().onUserStarting(TimingsTraceAndSlog.newAsyncLog(), userId);
         }
 
+        void setPerformancePowerMode(boolean enabled) {
+            Slogf.i(TAG, "Setting power mode MODE_FIXED_PERFORMANCE to " + enabled);
+            getPowerManagerInternal().setPowerMode(
+                    PowerManagerInternal.MODE_FIXED_PERFORMANCE, enabled);
+        }
+
         void onSystemUserVisibilityChanged(boolean visible) {
             getUserManagerInternal().onSystemUserVisibilityChanged(visible);
         }