diff -r 676d6539e0e0 -r c70b36f0730d hotspot/src/share/vm/gc/g1/g1ParScanThreadState.cpp
--- a/hotspot/src/share/vm/gc/g1/g1ParScanThreadState.cpp	Wed May 24 18:28:34 2017 -0700
+++ b/hotspot/src/share/vm/gc/g1/g1ParScanThreadState.cpp	Wed Jun 14 11:26:44 2017 +0200
@@ -337,16 +337,6 @@
   return _states[worker_id];
 }
 
-void G1ParScanThreadStateSet::add_cards_scanned(uint worker_id, size_t cards_scanned) {
-  assert(worker_id < _n_workers, "out of bounds access");
-  _cards_scanned[worker_id] += cards_scanned;
-}
-
-size_t G1ParScanThreadStateSet::total_cards_scanned() const {
-  assert(_flushed, "thread local state from the per thread states should have been flushed");
-  return _total_cards_scanned;
-}
-
 const size_t* G1ParScanThreadStateSet::surviving_young_words() const {
   assert(_flushed, "thread local state from the per thread states should have been flushed");
   return _surviving_young_words_total;
@@ -354,7 +344,6 @@
 
 void G1ParScanThreadStateSet::flush() {
   assert(!_flushed, "thread local state from the per thread states should be flushed once");
-  assert(_total_cards_scanned == 0, "should have been cleared");
 
   for (uint worker_index = 0; worker_index < _n_workers; ++worker_index) {
     G1ParScanThreadState* pss = _states[worker_index];
@@ -363,8 +352,6 @@
       continue;
     }
 
-    _total_cards_scanned += _cards_scanned[worker_index];
-
     pss->flush(_surviving_young_words_total);
     delete pss;
     _states[worker_index] = NULL;