--- old/src/hotspot/share/gc/g1/g1CollectionSet.cpp	2019-11-20 14:56:48.993394152 +0100
+++ new/src/hotspot/share/gc/g1/g1CollectionSet.cpp	2019-11-20 14:56:48.657383753 +0100
@@ -27,6 +27,7 @@
 #include "gc/g1/g1CollectionSet.hpp"
 #include "gc/g1/g1CollectionSetCandidates.hpp"
 #include "gc/g1/g1CollectorState.hpp"
+#include "gc/g1/g1HotCardCache.hpp"
 #include "gc/g1/g1ParScanThreadState.hpp"
 #include "gc/g1/g1Policy.hpp"
 #include "gc/g1/heapRegion.inline.hpp"
@@ -409,7 +410,7 @@
   guarantee(target_pause_time_ms > 0.0,
             "target_pause_time_ms = %1.6lf should be positive", target_pause_time_ms);
 
-  size_t pending_cards = _policy->pending_cards_at_gc_start();
+  size_t pending_cards = _policy->pending_cards_at_gc_start() + _g1h->hot_card_cache()->num_entries();
   double base_time_ms = _policy->predict_base_elapsed_time_ms(pending_cards);
   double time_remaining_ms = MAX2(target_pause_time_ms - base_time_ms, 0.0);