--- a/src/hotspot/share/gc/cms/gSpaceCounters.hpp	Fri Aug 16 16:50:17 2019 +0200
+++ b/src/hotspot/share/gc/cms/gSpaceCounters.hpp	Fri Aug 16 18:06:51 2019 +0000
@@ -59,7 +59,7 @@
   }
 
   inline void update_used() {
-    _used->set_value(_gen->used());
+    _used->set_value(_gen->used_stable());
   }
 
   // special version of update_used() to allow the used value to be
@@ -103,7 +103,7 @@
     GenerationUsedHelper(Generation* g) : _gen(g) { }
 
     inline jlong take_sample() {
-      return _gen->used();
+      return _gen->used_stable();
     }
 };