--- old/src/hotspot/share/gc/g1/g1Analytics.cpp	2019-10-22 14:06:30.684933324 +0200
+++ new/src/hotspot/share/gc/g1/g1Analytics.cpp	2019-10-22 14:06:30.348922778 +0200
@@ -44,11 +44,11 @@
 };
 
 // all the same
-static double young_cards_per_entry_ratio_defaults[] = {
+static double young_card_merge_to_scan_ratio_defaults[] = {
   1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0
 };
 
-static double young_only_cost_per_remset_card_ms_defaults[] = {
+static double young_only_cost_per_card_scan_ms_defaults[] = {
   0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005
 };
 
@@ -61,7 +61,6 @@
   5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0
 };
 
-
 static double young_other_cost_per_region_ms_defaults[] = {
   0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1
 };
@@ -80,13 +79,13 @@
     _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)),
     _concurrent_refine_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
     _logged_cards_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
-    _cost_per_logged_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
-    _cost_scan_hcc_seq(new TruncatedSeq(TruncatedSeqLength)),
-    _young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)),
-    _mixed_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)),
-    _young_only_cost_per_remset_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
-    _mixed_cost_per_remset_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
-    _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
+    _young_card_merge_to_scan_ratio_seq(new TruncatedSeq(TruncatedSeqLength)),
+    _mixed_card_merge_to_scan_ratio_seq(new TruncatedSeq(TruncatedSeqLength)),
+    _young_cost_per_card_scan_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
+    _mixed_cost_per_card_scan_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
+    _young_cost_per_card_merge_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
+    _mixed_cost_per_card_merge_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
+    _copy_cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
     _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
     _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
     _non_young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
@@ -108,11 +107,10 @@
   _concurrent_refine_rate_ms_seq->add(1/cost_per_logged_card_ms_defaults[0]);
   // Some applications have very low rates for logging cards.
   _logged_cards_rate_ms_seq->add(0.0);
-  _cost_per_logged_card_ms_seq->add(cost_per_logged_card_ms_defaults[index]);
-  _cost_scan_hcc_seq->add(0.0);
-  _young_cards_per_entry_ratio_seq->add(young_cards_per_entry_ratio_defaults[index]);
-  _young_only_cost_per_remset_card_ms_seq->add(young_only_cost_per_remset_card_ms_defaults[index]);
-  _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]);
+  _young_card_merge_to_scan_ratio_seq->add(young_card_merge_to_scan_ratio_defaults[index]);
+  _young_cost_per_card_scan_ms_seq->add(young_only_cost_per_card_scan_ms_defaults[index]);
+
+  _copy_cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]);
   _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]);
   _young_other_cost_per_region_ms_seq->add(young_other_cost_per_region_ms_defaults[index]);
   _non_young_other_cost_per_region_ms_seq->add(non_young_other_cost_per_region_ms_defaults[index]);
@@ -173,27 +171,27 @@
   _logged_cards_rate_ms_seq->add(cards_per_ms);
 }
 
-void G1Analytics::report_cost_per_logged_card_ms(double cost_per_logged_card_ms) {
-  _cost_per_logged_card_ms_seq->add(cost_per_logged_card_ms);
-}
-
-void G1Analytics::report_cost_scan_hcc(double cost_scan_hcc) {
-  _cost_scan_hcc_seq->add(cost_scan_hcc);
+void G1Analytics::report_cost_per_card_scan_ms(double cost_per_card_ms, bool for_young_gc) {
+  if (for_young_gc) {
+    _young_cost_per_card_scan_ms_seq->add(cost_per_card_ms);
+  } else {
+    _mixed_cost_per_card_scan_ms_seq->add(cost_per_card_ms);
+  }
 }
 
-void G1Analytics::report_cost_per_remset_card_ms(double cost_per_remset_card_ms, bool for_young_gc) {
+void G1Analytics::report_cost_per_card_merge_ms(double cost_per_card_ms, bool for_young_gc) {
   if (for_young_gc) {
-    _young_only_cost_per_remset_card_ms_seq->add(cost_per_remset_card_ms);
+    _young_cost_per_card_merge_ms_seq->add(cost_per_card_ms);
   } else {
-    _mixed_cost_per_remset_card_ms_seq->add(cost_per_remset_card_ms);
+    _mixed_cost_per_card_merge_ms_seq->add(cost_per_card_ms);
   }
 }
 
-void G1Analytics::report_cards_per_entry_ratio(double cards_per_entry_ratio, bool for_young_gc) {
+void G1Analytics::report_card_merge_to_scan_ratio(double merge_to_scan_ratio, bool for_young_gc) {
   if (for_young_gc) {
-    _young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio);
+    _young_card_merge_to_scan_ratio_seq->add(merge_to_scan_ratio);
   } else {
-    _mixed_cards_per_entry_ratio_seq->add(cards_per_entry_ratio);
+    _mixed_card_merge_to_scan_ratio_seq->add(merge_to_scan_ratio);
   }
 }
 
@@ -205,7 +203,7 @@
   if (mark_or_rebuild_in_progress) {
     _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms);
   } else {
-    _cost_per_byte_ms_seq->add(cost_per_byte_ms);
+    _copy_cost_per_byte_ms_seq->add(cost_per_byte_ms);
   }
 }
 
@@ -241,57 +239,37 @@
   return get_new_prediction(_logged_cards_rate_ms_seq);
 }
 
-double G1Analytics::predict_cost_per_logged_card_ms() const {
-  return get_new_prediction(_cost_per_logged_card_ms_seq);
-}
-
-double G1Analytics::predict_scan_hcc_ms() const {
-  return get_new_prediction(_cost_scan_hcc_seq);
-}
-
-double G1Analytics::predict_rs_update_time_ms(size_t pending_cards) const {
-  return pending_cards * predict_cost_per_logged_card_ms() + predict_scan_hcc_ms();
+double G1Analytics::predict_young_card_merge_to_scan_ratio() const {
+  return get_new_prediction(_young_card_merge_to_scan_ratio_seq);
 }
 
-double G1Analytics::predict_young_cards_per_entry_ratio() const {
-  return get_new_prediction(_young_cards_per_entry_ratio_seq);
-}
-
-double G1Analytics::predict_mixed_cards_per_entry_ratio() const {
-  if (_mixed_cards_per_entry_ratio_seq->num() < 2) {
-    return predict_young_cards_per_entry_ratio();
-  } else {
-    return get_new_prediction(_mixed_cards_per_entry_ratio_seq);
-  }
-}
-
-size_t G1Analytics::predict_card_num(size_t rs_length, bool for_young_gc) const {
-  if (for_young_gc) {
-    return (size_t) (rs_length * predict_young_cards_per_entry_ratio());
+size_t G1Analytics::predict_scan_card_num(size_t rs_length, bool for_young_gc) const {
+  if (for_young_gc || _mixed_card_merge_to_scan_ratio_seq->num() < 3) {
+    return (size_t) (rs_length * predict_young_card_merge_to_scan_ratio());
   } else {
-    return (size_t) (rs_length * predict_mixed_cards_per_entry_ratio());
+    return (size_t) (rs_length * get_new_prediction(_mixed_card_merge_to_scan_ratio_seq));
   }
 }
 
-double G1Analytics::predict_rs_scan_time_ms(size_t card_num, bool for_young_gc) const {
-  if (for_young_gc) {
-    return card_num * get_new_prediction(_young_only_cost_per_remset_card_ms_seq);
+double G1Analytics::predict_card_merge_time_ms(size_t card_num, bool for_young_gc) const {
+  if (for_young_gc || _mixed_cost_per_card_merge_ms_seq->num() < 3) {
+    return card_num * get_new_prediction(_young_cost_per_card_merge_ms_seq);
   } else {
-    return predict_mixed_rs_scan_time_ms(card_num);
+    return card_num * get_new_prediction(_mixed_cost_per_card_merge_ms_seq);
   }
 }
 
-double G1Analytics::predict_mixed_rs_scan_time_ms(size_t card_num) const {
-  if (_mixed_cost_per_remset_card_ms_seq->num() < 3) {
-    return card_num * get_new_prediction(_young_only_cost_per_remset_card_ms_seq);
+double G1Analytics::predict_card_scan_time_ms(size_t card_num, bool for_young_gc) const {
+  if (for_young_gc || _mixed_cost_per_card_scan_ms_seq->num() < 3) {
+    return card_num * get_new_prediction(_young_cost_per_card_scan_ms_seq);
   } else {
-    return card_num * get_new_prediction(_mixed_cost_per_remset_card_ms_seq);
+    return card_num * get_new_prediction(_mixed_cost_per_card_scan_ms_seq);
   }
 }
 
 double G1Analytics::predict_object_copy_time_ms_during_cm(size_t bytes_to_copy) const {
   if (_cost_per_byte_ms_during_cm_seq->num() < 3) {
-    return (1.1 * bytes_to_copy) * get_new_prediction(_cost_per_byte_ms_seq);
+    return (1.1 * bytes_to_copy) * get_new_prediction(_copy_cost_per_byte_ms_seq);
   } else {
     return bytes_to_copy * get_new_prediction(_cost_per_byte_ms_during_cm_seq);
   }
@@ -301,14 +279,10 @@
   if (during_concurrent_mark) {
     return predict_object_copy_time_ms_during_cm(bytes_to_copy);
   } else {
-    return bytes_to_copy * get_new_prediction(_cost_per_byte_ms_seq);
+    return bytes_to_copy * get_new_prediction(_copy_cost_per_byte_ms_seq);
   }
 }
 
-double G1Analytics::predict_cost_per_byte_ms() const {
-  return get_new_prediction(_cost_per_byte_ms_seq);
-}
-
 double G1Analytics::predict_constant_other_time_ms() const {
   return get_new_prediction(_constant_other_time_ms_seq);
 }