--- old/src/share/vm/gc/g1/g1RemSet.cpp	2017-07-10 14:17:03.415569588 +0200
+++ new/src/share/vm/gc/g1/g1RemSet.cpp	2017-07-10 14:17:03.318566579 +0200
@@ -783,20 +783,11 @@
   return update_rs_cl->has_refs_into_cset();
 }
 
-void G1RemSet::initialize_periodic_summary_info() {
-  if (log_is_enabled(Trace, gc, remset)) {
-    _prev_period_summary.initialize(this);
-  }
-}
-
 void G1RemSet::print_periodic_summary_info(const char* header, uint period_count) {
   if ((G1SummarizeRSetStatsPeriod > 0) && log_is_enabled(Trace, gc, remset) &&
       (period_count % G1SummarizeRSetStatsPeriod == 0)) {
 
-    assert(_prev_period_summary.initialized(), "Periodic remembered set summary must be initialized.");
-
     G1RemSetSummary current;
-    current.initialize(this);
     _prev_period_summary.subtract_from(&current);
 
     Log(gc, remset) log;
@@ -813,7 +804,6 @@
   if (log.is_trace()) {
     log.trace(" Cumulative RS summary");
     G1RemSetSummary current;
-    current.initialize(this);
     ResourceMark rm;
     current.print_on(log.trace_stream());
   }