--- old/test/hotspot/jtreg/gc/z/TestHighUsage.java	2020-02-20 09:02:44.081618091 +0100
+++ new/test/hotspot/jtreg/gc/z/TestHighUsage.java	2020-02-20 09:02:43.750611430 +0100
@@ -87,7 +87,6 @@
     public static void main(String[] args) throws Exception {
         ProcessTools.executeTestJvm(new String[]{ "-XX:+UnlockExperimentalVMOptions",
                                                   "-XX:+UseZGC",
-                                                  "-XX:+UnlockDiagnosticVMOptions",
                                                   "-XX:-ZProactive",
                                                   "-Xms128M",
                                                   "-Xmx128M",