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 "gc/g1/g1Predictions.hpp" 29 #include "utilities/numberSeq.hpp" 30 31 class SurvRateGroup : public CHeapObj<mtGC> { 32 size_t _stats_arrays_length; 33 double* _accum_surv_rate_pred; 34 double _last_pred; 35 TruncatedSeq** _surv_rate_predictors; 36 37 size_t _num_added_regions; // The number of regions in this SurvRateGroup 38 39 void fill_in_last_surv_rates(); 40 void finalize_predictions(const G1Predictions& predictor); 41 42 public: 43 static const int InvalidAgeIndex = -1; 44 static bool is_valid_age_index(int age) { return age >= 0; } 45 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 double accum_surv_rate_pred(int age) const { 54 assert(_stats_arrays_length > 0, "invariant" ); 55 assert(is_valid_age_index(age), "must be"); 56 if ((size_t)age < _stats_arrays_length) 57 return _accum_surv_rate_pred[age]; 58 else { 59 double diff = (double)(age - _stats_arrays_length + 1); 60 return _accum_surv_rate_pred[_stats_arrays_length - 1] + diff * _last_pred; 61 } 62 } 63 64 double surv_rate_pred(G1Predictions const& predictor, int age) const { 65 assert(is_valid_age_index(age), "must be"); 66 67 age = MIN2(age, (int)_stats_arrays_length - 1); 68 69 return predictor.predict_in_unit_interval(_surv_rate_predictors[age]); 70 } 71 72 int next_age_index() { 73 return (int)++_num_added_regions; 74 } 75 76 int age_in_group(int age_index) const { 77 int result = (int)(_num_added_regions - age_index); 78 assert(is_valid_age_index(result), "invariant" ); 79 return result; 80 } 81 }; 82 83 #endif // SHARE_GC_G1_SURVRATEGROUP_HPP