diff -r f0312c7d5b37 -r ba6c248cae19 src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/tools/HeapSummary.java
--- a/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/tools/HeapSummary.java	Wed Nov 13 11:21:15 2019 +0100
+++ b/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/tools/HeapSummary.java	Wed Nov 13 11:37:29 2019 +0100
@@ -160,12 +160,6 @@
           System.out.println("using thread-local object allocation.");
        }
 
-       l = getFlagValue("UseConcMarkSweepGC", flagMap);
-       if (l == 1L) {
-          System.out.println("Concurrent Mark-Sweep GC");
-          return;
-       }
-
        l = getFlagValue("UseParallelGC", flagMap);
        if (l == 1L) {
           System.out.print("Parallel GC ");