8015440: java/lang/management/MemoryMXBean/ResetPeakMemoryUsage.java fails with RuntimeException

Summary: Make sure serial gc compacts heap every time
Reviewed-by: mchung, brutisso, nloodin

test/java/lang/management/MemoryMXBean/ResetPeakMemoryUsage.java

@@ -21,6 +21,11 @@
  * questions.
  */
 
+/*
+ * The -XX:MarkSweepAlwaysCompactCount=1 argument below makes sure serial gc
+ * compacts the heap at every full gc so that the usage is correctly updated.
+ */
+
 /*
  * @test
  * @bug     4892507
@@ -28,7 +33,7 @@
  * @author  Mandy Chung
  *
  * @build ResetPeakMemoryUsage MemoryUtil
- * @run main/othervm -XX:+UseSerialGC -Xmn8m ResetPeakMemoryUsage
+ * @run main/othervm -XX:+UseSerialGC -XX:MarkSweepAlwaysCompactCount=1 -Xmn8m ResetPeakMemoryUsage
  * @run main/othervm -XX:+UseConcMarkSweepGC -Xmn8m ResetPeakMemoryUsage
  * @run main/othervm -XX:+UseParallelGC -Xmn8m ResetPeakMemoryUsage
  * @run main/othervm -XX:+UseG1GC -Xmn8m -XX:G1HeapRegionSize=1m ResetPeakMemoryUsage