survRateGroup.hpp revision 11131:15188aed63c0 
1/*
2 * Copyright (c) 2001, 2015, 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.
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24
25#ifndef SHARE_VM_GC_G1_SURVRATEGROUP_HPP
26#define SHARE_VM_GC_G1_SURVRATEGROUP_HPP
27
28#include "utilities/numberSeq.hpp"
29
30class G1Predictions;
31
32class SurvRateGroup : public CHeapObj<mtGC> {
33private:
34  size_t  _stats_arrays_length;
35  double* _accum_surv_rate_pred;
36  double  _last_pred;
37  TruncatedSeq** _surv_rate_pred;
38
39  int _all_regions_allocated;
40  size_t _region_num;
41  size_t _setup_seq_num;
42
43  void fill_in_last_surv_rates();
44  void finalize_predictions(const G1Predictions& predictor);
45public:
46  SurvRateGroup();
47  void reset();
48  void start_adding_regions();
49  void stop_adding_regions();
50  void record_surviving_words(int age_in_group, size_t surv_words);
51  void all_surviving_words_recorded(const G1Predictions& predictor, bool update_predictors);
52
53  size_t region_num() const { return _region_num; }
54
55  double accum_surv_rate_pred(int age) const {
56    assert(age >= 0, "must be");
57    if ((size_t)age < _stats_arrays_length)
58      return _accum_surv_rate_pred[age];
59    else {
60      double diff = (double) (age - _stats_arrays_length + 1);
61      return _accum_surv_rate_pred[_stats_arrays_length-1] + diff * _last_pred;
62    }
63  }
64
65  TruncatedSeq* get_seq(size_t age) const {
66    if (age >= _setup_seq_num) {
67      guarantee( _setup_seq_num > 0, "invariant" );
68      age = _setup_seq_num-1;
69    }
70    TruncatedSeq* seq = _surv_rate_pred[age];
71    guarantee( seq != NULL, "invariant" );
72    return seq;
73  }
74
75  int next_age_index() {
76    ++_region_num;
77    return (int) ++_all_regions_allocated;
78  }
79
80  int age_in_group(int age_index) const {
81    int ret = (int) (_all_regions_allocated - age_index);
82    assert( ret >= 0, "invariant" );
83    return ret;
84  }
85  void finished_recalculating_age_indexes() {
86    _all_regions_allocated = 0;
87  }
88
89};
90
91#endif // SHARE_VM_GC_G1_SURVRATEGROUP_HPP
92