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

rev 59700 : imported patch 8244603-g1-limits-young-gen-size-8238858-prepare-mixed-sizing

*** 147,168 ****
  
  void G1Analytics::report_alloc_rate_ms(double alloc_rate) {
    _alloc_rate_ms_seq->add(alloc_rate);
  }
  
! void G1Analytics::compute_pause_time_ratio(double interval_ms, double pause_time_ms) {
!   _long_term_pause_time_ratio = _recent_gc_times_ms->sum() / interval_ms;
!   // Filter out nonsensical results due to bad input.
    _long_term_pause_time_ratio = clamp(_long_term_pause_time_ratio, 0.0, 1.0);
  
!   // Compute the ratio of just this last pause time to the entire time range stored
!   // in the vectors. Comparing this pause to the entire range, rather than only the
!   // most recent interval, has the effect of smoothing over a possible transient 'burst'
!   // of more frequent pauses that don't really reflect a change in heap occupancy.
!   // This reduces the likelihood of a needless heap expansion being triggered.
!   _short_term_pause_time_ratio =
!     (pause_time_ms * _recent_prev_end_times_for_all_gcs_sec->num()) / interval_ms;
  }
  
  void G1Analytics::report_concurrent_refine_rate_ms(double cards_per_ms) {
    _concurrent_refine_rate_ms_seq->add(cards_per_ms);
  }
--- 147,164 ----
  
  void G1Analytics::report_alloc_rate_ms(double alloc_rate) {
    _alloc_rate_ms_seq->add(alloc_rate);
  }
  
! void G1Analytics::compute_pause_time_ratios(double end_time_sec, double pause_time_ms) {
!   double long_interval_ms = (end_time_sec - oldest_known_gc_end_time_sec()) * 1000.0;
!   _long_term_pause_time_ratio = _recent_gc_times_ms->sum() / long_interval_ms;
    _long_term_pause_time_ratio = clamp(_long_term_pause_time_ratio, 0.0, 1.0);
  
!   double short_interval_ms = (end_time_sec - most_recent_gc_end_time_sec()) * 1000.0;
!   _short_term_pause_time_ratio = pause_time_ms / short_interval_ms;
!   _short_term_pause_time_ratio = clamp(_short_term_pause_time_ratio, 0.0, 1.0);
  }
  
  void G1Analytics::report_concurrent_refine_rate_ms(double cards_per_ms) {
    _concurrent_refine_rate_ms_seq->add(cards_per_ms);
  }
*** 226,236 ****
--- 222,236 ----
  void G1Analytics::report_rs_length(double rs_length) {
    _rs_length_seq->add(rs_length);
  }
  
  double G1Analytics::predict_alloc_rate_ms() const {
+   if (!enough_samples_available(_alloc_rate_ms_seq)) {
      return predict_zero_bounded(_alloc_rate_ms_seq);
+   } else {
+     return 0.0;
+   }
  }
  
  double G1Analytics::predict_concurrent_refine_rate_ms() const {
    return predict_zero_bounded(_concurrent_refine_rate_ms_seq);
  }
*** 309,322 ****
  
  size_t G1Analytics::predict_pending_cards() const {
    return predict_size(_pending_cards_seq);
  }
  
! double G1Analytics::last_known_gc_end_time_sec() const {
    return _recent_prev_end_times_for_all_gcs_sec->oldest();
  }
  
  void G1Analytics::update_recent_gc_times(double end_time_sec,
                                           double pause_time_ms) {
    _recent_gc_times_ms->add(pause_time_ms);
    _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec);
    _prev_collection_pause_end_ms = end_time_sec * 1000.0;
--- 309,326 ----
  
  size_t G1Analytics::predict_pending_cards() const {
    return predict_size(_pending_cards_seq);
  }
  
! double G1Analytics::oldest_known_gc_end_time_sec() const {
    return _recent_prev_end_times_for_all_gcs_sec->oldest();
  }
  
+ double G1Analytics::most_recent_gc_end_time_sec() const {
+   return _recent_prev_end_times_for_all_gcs_sec->last();
+ }
+ 
  void G1Analytics::update_recent_gc_times(double end_time_sec,
                                           double pause_time_ms) {
    _recent_gc_times_ms->add(pause_time_ms);
    _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec);
    _prev_collection_pause_end_ms = end_time_sec * 1000.0;