diff -r 2c3cc4b01880 -r c16ac7a2eba4 src/hotspot/share/gc/z/zTracer.cpp
--- a/src/hotspot/share/gc/z/zTracer.cpp	Wed Oct 30 16:14:56 2019 +0100
+++ b/src/hotspot/share/gc/z/zTracer.cpp	Wed Oct 30 19:43:52 2019 +0100
@@ -59,11 +59,9 @@
 
 static void register_jfr_type_serializers() {
   JfrSerializer::register_serializer(TYPE_ZSTATISTICSCOUNTERTYPE,
-                                     false /* require_safepoint */,
                                      true /* permit_cache */,
                                      new ZStatisticsCounterTypeConstant());
   JfrSerializer::register_serializer(TYPE_ZSTATISTICSSAMPLERTYPE,
-                                     false /* require_safepoint */,
                                      true /* permit_cache */,
                                      new ZStatisticsSamplerTypeConstant());
 }