test/hotspot/jtreg/gc/stress/systemgc/TestSystemGCWithShenandoah.java

@@ -38,10 +38,26 @@
   *
   * @run main/othervm/timeout=300 -Xlog:gc*=info -Xmx512m -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions
   *      -XX:+UseShenandoahGC
   *      gc.stress.systemgc.TestSystemGCWithShenandoah 270
   */
+ /*
+  * @test id=alt-forwarding
+  * @key stress
+  * @library /
+  * @requires vm.gc.Shenandoah
+  * @summary Stress the Shenandoah GC full GC by allocating objects of different lifetimes concurrently with System.gc().
+  *
+  * @run main/othervm/timeout=300 -Xlog:gc*=info -Xmx512m -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions
+  *      -XX:+UseShenandoahGC -XX:+UseAltGCForwarding
+  *      -XX:+ShenandoahVerify
+  *      gc.stress.systemgc.TestSystemGCWithShenandoah 270
+  *
+  * @run main/othervm/timeout=300 -Xlog:gc*=info -Xmx512m -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions
+  *      -XX:+UseShenandoahGC
+  *      gc.stress.systemgc.TestSystemGCWithShenandoah 270
+  */
  
  /*
   * @test id=iu
   * @key stress
   * @library /