1 /* 2 * Copyright (c) 2001, 2019, 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_GC_G1_SURVRATEGROUP_HPP 26 #define SHARE_GC_G1_SURVRATEGROUP_HPP 27 28 #include "utilities/numberSeq.hpp" 29 30 class G1Predictions; 31 32 class SurvRateGroup : public CHeapObj<mtGC> { 33 private: 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); 45 public: 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_GC_G1_SURVRATEGROUP_HPP