--- old/test/hotspot/jtreg/gc/TestGenerationPerfCounter.java	2019-03-19 17:31:54.668259742 +0800
+++ new/test/hotspot/jtreg/gc/TestGenerationPerfCounter.java	2019-03-19 17:31:54.564259742 +0800
@@ -29,7 +29,7 @@
 
 /* @test TestGenerationPerfCounter
  * @bug 8080345
- * @requires vm.gc=="null"
+ * @requires vm.gc.Serial & vm.gc.Parallel & vm.gc.G1
  * @library /test/lib /
  * @summary Tests that the sun.gc.policy.generations returns 2 for all GCs.
  * @modules java.base/jdk.internal.misc
@@ -44,7 +44,7 @@
 /* @test TestGenerationPerfCounterCMS
  * @bug 8080345
  * @comment Graal does not support CMS
- * @requires vm.gc=="null" & !vm.graal.enabled
+ * @requires vm.gc.ConcMarkSweep & !vm.graal.enabled
  * @library /test/lib /
  * @summary Tests that the sun.gc.policy.generations returns 2 for all GCs.
  * @modules java.base/jdk.internal.misc