src/hotspot/share/gc/g1/g1Analytics.cpp

rev 57223 : imported patch 8225484-changes-to-survivor-calculation

@@ -92,10 +92,11 @@
     _non_young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
     _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)),
     _rs_length_seq(new TruncatedSeq(TruncatedSeqLength)),
     _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)),
     _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)),
+    _survivor_ratio(new TruncatedSeq(TruncatedSeqLength)),
     _recent_avg_pause_time_ratio(0.0),
     _last_pause_time_ratio(0.0) {
 
   // Seed sequences with initial values.
   _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime());

@@ -117,10 +118,12 @@
   _non_young_other_cost_per_region_ms_seq->add(non_young_other_cost_per_region_ms_defaults[index]);
 
   // start conservatively (around 50ms is about right)
   _concurrent_mark_remark_times_ms->add(0.05);
   _concurrent_mark_cleanup_times_ms->add(0.20);
+
+  _survivor_ratio->add(0.5);
 }
 
 bool G1Analytics::enough_samples_available(TruncatedSeq const* seq) const {
   return seq->num() >= 3;
 }

@@ -226,10 +229,14 @@
 
 void G1Analytics::report_rs_length(double rs_length) {
   _rs_length_seq->add(rs_length);
 }
 
+void G1Analytics::report_survivor_ratio(double ratio) {
+  _survivor_ratio->add(ratio);
+}
+
 double G1Analytics::predict_alloc_rate_ms() const {
   return predict_zero_bounded(_alloc_rate_ms_seq);
 }
 
 double G1Analytics::predict_concurrent_refine_rate_ms() const {

@@ -282,10 +289,14 @@
   } else {
     return bytes_to_copy * predict_zero_bounded(_copy_cost_per_byte_ms_seq);
   }
 }
 
+double G1Analytics::predict_survivor_ratio() const {
+  return predict_in_unit_interval(_survivor_ratio);
+}
+
 double G1Analytics::predict_constant_other_time_ms() const {
   return predict_zero_bounded(_constant_other_time_ms_seq);
 }
 
 double G1Analytics::predict_young_other_time_ms(size_t young_num) const {