8370501: vmTestbase/vm/gc/compact/Humongous_NonbranchyTree5M/TestDescription.java intermittent timed out

Reviewed-by: tschatzl

Author: SendaoYan

test/hotspot/jtreg/vmTestbase/vm/gc/compact/Humongous_NonbranchyTree5M/TestDescription.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -36,7 +36,7 @@
  *
  * @library /vmTestbase
  *          /test/lib
- * @run main/othervm
+ * @run main/othervm/timeout=480
  *      -XX:-UseGCOverheadLimit
  *      vm.gc.compact.Compact
  *      -gp nonbranchyTree(high)