1 /*
   2  * Copyright (c) 2001, 2012, 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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_SURVRATEGROUP_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_G1_SURVRATEGROUP_HPP
  27 
  28 #include "utilities/numberSeq.hpp"
  29 
  30 class G1CollectorPolicy;
  31 
  32 class SurvRateGroup : public CHeapObj<mtGC> {
  33 private:
  34   G1CollectorPolicy* _g1p;
  35   const char* _name;
  36 
  37   size_t  _stats_arrays_length;
  38   double* _surv_rate;
  39   double* _accum_surv_rate_pred;
  40   double  _last_pred;
  41   double  _accum_surv_rate;
  42   TruncatedSeq** _surv_rate_pred;
  43   NumberSeq**    _summary_surv_rates;
  44   size_t         _summary_surv_rates_len;
  45   size_t         _summary_surv_rates_max_len;
  46 
  47   int _all_regions_allocated;
  48   size_t _region_num;
  49   size_t _setup_seq_num;
  50 
  51 public:
  52   SurvRateGroup(G1CollectorPolicy* g1p,
  53                 const char* name,
  54                 size_t summary_surv_rates_len);
  55   void reset();
  56   void start_adding_regions();
  57   void stop_adding_regions();
  58   void record_surviving_words(int age_in_group, size_t surv_words);
  59   void all_surviving_words_recorded(bool propagate);
  60   const char* name() { return _name; }
  61 
  62   size_t region_num() { return _region_num; }
  63   double accum_surv_rate_pred(int age) {
  64     assert(age >= 0, "must be");
  65     if ((size_t)age < _stats_arrays_length)
  66       return _accum_surv_rate_pred[age];
  67     else {
  68       double diff = (double) (age - _stats_arrays_length + 1);
  69       return _accum_surv_rate_pred[_stats_arrays_length-1] + diff * _last_pred;
  70     }
  71   }
  72 
  73   double accum_surv_rate(size_t adjustment);
  74 
  75   TruncatedSeq* get_seq(size_t age) {
  76     if (age >= _setup_seq_num) {
  77       guarantee( _setup_seq_num > 0, "invariant" );
  78       age = _setup_seq_num-1;
  79     }
  80     TruncatedSeq* seq = _surv_rate_pred[age];
  81     guarantee( seq != NULL, "invariant" );
  82     return seq;
  83   }
  84 
  85   int next_age_index();
  86   int age_in_group(int age_index) {
  87     int ret = (int) (_all_regions_allocated - age_index);
  88     assert( ret >= 0, "invariant" );
  89     return ret;
  90   }
  91   void finished_recalculating_age_indexes() {
  92     _all_regions_allocated = 0;
  93   }
  94 
  95 #ifndef PRODUCT
  96   void print();
  97   void print_surv_rate_summary();
  98 #endif // PRODUCT
  99 };
 100 
 101 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_SURVRATEGROUP_HPP