1 /*
   2  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 class G1CollectorPolicy;
  26 
  27 class SurvRateGroup : public CHeapObj {
  28 private:
  29   G1CollectorPolicy* _g1p;
  30   const char* _name;
  31 
  32   size_t  _stats_arrays_length;
  33   double* _surv_rate;
  34   double* _accum_surv_rate_pred;
  35   double  _last_pred;
  36   double  _accum_surv_rate;
  37   TruncatedSeq** _surv_rate_pred;
  38   NumberSeq**    _summary_surv_rates;
  39   size_t         _summary_surv_rates_len;
  40   size_t         _summary_surv_rates_max_len;
  41 
  42   int _all_regions_allocated;
  43   size_t _region_num;
  44   size_t _setup_seq_num;
  45 
  46 public:
  47   SurvRateGroup(G1CollectorPolicy* g1p,
  48                 const char* name,
  49                 size_t summary_surv_rates_len);
  50   void reset();
  51   void start_adding_regions();
  52   void stop_adding_regions();
  53   void record_surviving_words(int age_in_group, size_t surv_words);
  54   void all_surviving_words_recorded(bool propagate);
  55   const char* name() { return _name; }
  56 
  57   size_t region_num() { return _region_num; }
  58   double accum_surv_rate_pred(int age) {
  59     assert(age >= 0, "must be");
  60     if ((size_t)age < _stats_arrays_length)
  61       return _accum_surv_rate_pred[age];
  62     else {
  63       double diff = (double) (age - _stats_arrays_length + 1);
  64       return _accum_surv_rate_pred[_stats_arrays_length-1] + diff * _last_pred;
  65     }
  66   }
  67 
  68   double accum_surv_rate(size_t adjustment);
  69 
  70   TruncatedSeq* get_seq(size_t age) {
  71     if (age >= _setup_seq_num) {
  72       guarantee( _setup_seq_num > 0, "invariant" );
  73       age = _setup_seq_num-1;
  74     }
  75     TruncatedSeq* seq = _surv_rate_pred[age];
  76     guarantee( seq != NULL, "invariant" );
  77     return seq;
  78   }
  79 
  80   int next_age_index();
  81   int age_in_group(int age_index) {
  82     int ret = (int) (_all_regions_allocated - age_index);
  83     assert( ret >= 0, "invariant" );
  84     return ret;
  85   }
  86   void finished_recalculating_age_indexes() {
  87     _all_regions_allocated = 0;
  88   }
  89 
  90 #ifndef PRODUCT
  91   void print();
  92   void print_surv_rate_summary();
  93 #endif // PRODUCT
  94 };