--- old/test/hotspot/jtreg/gc/g1/TestShrinkDefragmentedHeap.java	2019-03-19 17:32:01.176259742 +0800
+++ new/test/hotspot/jtreg/gc/g1/TestShrinkDefragmentedHeap.java	2019-03-19 17:32:01.068259742 +0800
@@ -34,6 +34,7 @@
  *     3. invoke gc and check that memory returned to the system (amount of committed memory got down)
  *
  * @library /test/lib /
+ * @requires vm.gc.G1
  * @modules java.base/jdk.internal.misc
  *          java.management/sun.management
  * @run main gc.g1.TestShrinkDefragmentedHeap