1 /* 2 * Copyright (c) 2016, 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_G1_G1POLICY_HPP 26 #define SHARE_VM_GC_G1_G1POLICY_HPP 27 28 #include "gc/g1/g1CollectorState.hpp" 29 #include "gc/g1/g1GCPhaseTimes.hpp" 30 #include "gc/g1/g1InCSetState.hpp" 31 #include "gc/g1/g1InitialMarkToMixedTimeTracker.hpp" 32 #include "gc/g1/g1MMUTracker.hpp" 33 #include "gc/g1/g1Predictions.hpp" 34 #include "gc/g1/g1YoungGenSizer.hpp" 35 #include "gc/shared/gcCause.hpp" 36 #include "utilities/pair.hpp" 37 38 // A G1Policy makes policy decisions that determine the 39 // characteristics of the collector. Examples include: 40 // * choice of collection set. 41 // * when to collect. 42 43 class HeapRegion; 44 class G1CollectionSet; 45 class CollectionSetChooser; 46 class G1IHOPControl; 47 class G1Analytics; 48 class G1YoungGenSizer; 49 50 class G1Policy: public CHeapObj<mtGC> { 51 public: 52 virtual const G1Predictions& predictor() const = 0; 53 virtual const G1Analytics* analytics() const = 0; 54 55 // Add the given number of bytes to the total number of allocated bytes in the old gen. 56 virtual void add_bytes_allocated_in_old_since_last_gc(size_t bytes) = 0; 57 58 // Accessors 59 60 virtual void set_region_eden(HeapRegion* hr, int young_index_in_cset) = 0; 61 virtual void set_region_survivor(HeapRegion* hr, int young_index_in_cset) = 0; 62 63 virtual void record_max_rs_lengths(size_t rs_lengths) = 0; 64 65 virtual double predict_base_elapsed_time_ms(size_t pending_cards) const = 0; 66 virtual double predict_base_elapsed_time_ms(size_t pending_cards, 67 size_t scanned_cards) const = 0; 68 69 virtual double predict_region_elapsed_time_ms(HeapRegion* hr, bool for_young_gc) const = 0; 70 71 virtual void cset_regions_freed() = 0; 72 73 virtual G1MMUTracker* mmu_tracker() = 0; 74 75 virtual const G1MMUTracker* mmu_tracker() const = 0; 76 77 virtual double max_pause_time_ms() const = 0; 78 79 virtual size_t pending_cards() const = 0; 80 81 // Calculate the minimum number of old regions we'll add to the CSet 82 // during a mixed GC. 83 virtual uint calc_min_old_cset_length() const = 0; 84 85 // Calculate the maximum number of old regions we'll add to the CSet 86 // during a mixed GC. 87 virtual uint calc_max_old_cset_length() const = 0; 88 89 // Returns the given amount of uncollected reclaimable space 90 // as a percentage of the current heap capacity. 91 virtual double reclaimable_bytes_perc(size_t reclaimable_bytes) const = 0; 92 93 virtual ~G1Policy() {} 94 95 virtual G1CollectorState* collector_state() const = 0; 96 97 virtual G1GCPhaseTimes* phase_times() const = 0; 98 99 // Check the current value of the young list RSet lengths and 100 // compare it against the last prediction. If the current value is 101 // higher, recalculate the young list target length prediction. 102 virtual void revise_young_list_target_length_if_necessary(size_t rs_lengths) = 0; 103 104 // This should be called after the heap is resized. 105 virtual void record_new_heap_size(uint new_number_of_regions) = 0; 106 107 virtual void init(G1CollectedHeap* g1h, G1CollectionSet* collection_set) = 0; 108 109 virtual void note_gc_start() = 0; 110 111 virtual bool need_to_start_conc_mark(const char* source, size_t alloc_word_size = 0) = 0; 112 113 // Record the start and end of an evacuation pause. 114 virtual void record_collection_pause_start(double start_time_sec) = 0; 115 virtual void record_collection_pause_end(double pause_time_ms, size_t cards_scanned, size_t heap_used_bytes_before_gc) = 0; 116 117 // Record the start and end of a full collection. 118 virtual void record_full_collection_start() = 0; 119 virtual void record_full_collection_end() = 0; 120 121 // Must currently be called while the world is stopped. 122 virtual void record_concurrent_mark_init_end(double mark_init_elapsed_time_ms) = 0; 123 124 // Record start and end of remark. 125 virtual void record_concurrent_mark_remark_start() = 0; 126 virtual void record_concurrent_mark_remark_end() = 0; 127 128 // Record start, end, and completion of cleanup. 129 virtual void record_concurrent_mark_cleanup_start() = 0; 130 virtual void record_concurrent_mark_cleanup_end() = 0; 131 virtual void record_concurrent_mark_cleanup_completed() = 0; 132 133 virtual void print_phases() = 0; 134 135 // Record how much space we copied during a GC. This is typically 136 // called when a GC alloc region is being retired. 137 virtual void record_bytes_copied_during_gc(size_t bytes) = 0; 138 139 // The amount of space we copied during a GC. 140 virtual size_t bytes_copied_during_gc() const = 0; 141 142 virtual void finalize_collection_set(double target_pause_time_ms) = 0; 143 144 // This sets the initiate_conc_mark_if_possible() flag to start a 145 // new cycle, as long as we are not already in one. It's best if it 146 // is called during a safepoint when the test whether a cycle is in 147 // progress or not is stable. 148 virtual bool force_initial_mark_if_outside_cycle(GCCause::Cause gc_cause) = 0; 149 150 // This is called at the very beginning of an evacuation pause (it 151 // has to be the first thing that the pause does). If 152 // initiate_conc_mark_if_possible() is true, and the concurrent 153 // marking thread has completed its work during the previous cycle, 154 // it will set during_initial_mark_pause() to so that the pause does 155 // the initial-mark work and start a marking cycle. 156 virtual void decide_on_conc_mark_initiation() = 0; 157 158 // Print stats on young survival ratio 159 virtual void print_yg_surv_rate_info() const = 0; 160 161 virtual void finished_recalculating_age_indexes(bool is_survivors) = 0; 162 163 virtual size_t young_list_target_length() const = 0; 164 165 virtual bool should_allocate_mutator_region() const = 0; 166 167 virtual bool can_expand_young_list() const = 0; 168 169 virtual uint young_list_max_length() const = 0; 170 171 virtual bool adaptive_young_list_length() const = 0; 172 173 virtual bool should_process_references() const = 0; 174 175 virtual uint tenuring_threshold() const = 0; 176 virtual uint max_survivor_regions() = 0; 177 178 virtual void note_start_adding_survivor_regions() = 0; 179 180 virtual void note_stop_adding_survivor_regions() = 0; 181 182 virtual void record_age_table(AgeTable* age_table) = 0; 183 }; 184 185 #endif // SHARE_VM_GC_G1_G1POLICY_HPP