diff --git a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
index 98c37e65b9aca..4a687feb00d70 100644
--- a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
+++ b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
@@ -5812,15 +5812,10 @@ public class ActivityTaskManagerService extends IActivityTaskManager.Stub {
     }
 
     WindowProcessController getProcessController(int pid, int uid) {
-        final ArrayMap<String, SparseArray<WindowProcessController>> pmap = mProcessNames.getMap();
-        for (int i = pmap.size()-1; i >= 0; i--) {
-            final SparseArray<WindowProcessController> procs = pmap.valueAt(i);
-            for (int j = procs.size() - 1; j >= 0; j--) {
-                final WindowProcessController proc = procs.valueAt(j);
-                if (UserHandle.isApp(uid) && proc.getPid() == pid && proc.mUid == uid) {
-                    return proc;
-                }
-            }
+        final WindowProcessController proc = mPidMap.get(pid);
+        if (proc == null) return null;
+        if (UserHandle.isApp(uid) && proc.mUid == uid) {
+            return proc;
         }
         return null;
     }