1 /* 2 * Copyright (c) 2016, 2018, 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 #include "precompiled.hpp" 26 #include "gc/g1/g1CollectorPolicy.hpp" 27 #include "gc/g1/g1HeterogeneousHeapYoungGenSizer.hpp" 28 #include "gc/g1/g1YoungGenSizer.hpp" 29 #include "gc/g1/heapRegion.hpp" 30 #include "logging/log.hpp" 31 32 G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults), 33 _adaptive_size(true), _min_desired_young_length(0), _max_desired_young_length(0) { 34 35 if (FLAG_IS_CMDLINE(NewRatio)) { 36 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { 37 log_warning(gc, ergo)("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); 38 } else { 39 _sizer_kind = SizerNewRatio; 40 _adaptive_size = false; 41 return; 42 } 43 } 44 45 if (NewSize > MaxNewSize) { 46 if (FLAG_IS_CMDLINE(MaxNewSize)) { 47 log_warning(gc, ergo)("NewSize (" SIZE_FORMAT "k) is greater than the MaxNewSize (" SIZE_FORMAT "k). " 48 "A new max generation size of " SIZE_FORMAT "k will be used.", 49 NewSize/K, MaxNewSize/K, NewSize/K); 50 } 51 FLAG_SET_ERGO(size_t, MaxNewSize, NewSize); 52 } 53 54 if (FLAG_IS_CMDLINE(NewSize)) { 55 _min_desired_young_length = MAX2((uint) (NewSize / HeapRegion::GrainBytes), 56 1U); 57 if (FLAG_IS_CMDLINE(MaxNewSize)) { 58 _max_desired_young_length = 59 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), 60 1U); 61 _sizer_kind = SizerMaxAndNewSize; 62 _adaptive_size = _min_desired_young_length != _max_desired_young_length; 63 } else { 64 _sizer_kind = SizerNewSizeOnly; 65 } 66 } else if (FLAG_IS_CMDLINE(MaxNewSize)) { 67 _max_desired_young_length = 68 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), 69 1U); 70 _sizer_kind = SizerMaxNewSizeOnly; 71 } 72 } 73 74 uint G1YoungGenSizer::calculate_default_min_length(uint new_number_of_heap_regions) { 75 uint default_value = (new_number_of_heap_regions * G1NewSizePercent) / 100; 76 return MAX2(1U, default_value); 77 } 78 79 uint G1YoungGenSizer::calculate_default_max_length(uint new_number_of_heap_regions) { 80 uint default_value = (new_number_of_heap_regions * G1MaxNewSizePercent) / 100; 81 return MAX2(1U, default_value); 82 } 83 84 void G1YoungGenSizer::recalculate_min_max_young_length(uint number_of_heap_regions, uint* min_young_length, uint* max_young_length) { 85 assert(number_of_heap_regions > 0, "Heap must be initialized"); 86 87 switch (_sizer_kind) { 88 case SizerDefaults: 89 *min_young_length = calculate_default_min_length(number_of_heap_regions); 90 *max_young_length = calculate_default_max_length(number_of_heap_regions); 91 break; 92 case SizerNewSizeOnly: 93 *max_young_length = calculate_default_max_length(number_of_heap_regions); 94 *max_young_length = MAX2(*min_young_length, *max_young_length); 95 break; 96 case SizerMaxNewSizeOnly: 97 *min_young_length = calculate_default_min_length(number_of_heap_regions); 98 *min_young_length = MIN2(*min_young_length, *max_young_length); 99 break; 100 case SizerMaxAndNewSize: 101 // Do nothing. Values set on the command line, don't update them at runtime. 102 break; 103 case SizerNewRatio: 104 *min_young_length = number_of_heap_regions / (NewRatio + 1); 105 *max_young_length = *min_young_length; 106 break; 107 default: 108 ShouldNotReachHere(); 109 } 110 111 assert(*min_young_length <= *max_young_length, "Invalid min/max young gen size values"); 112 } 113 114 void G1YoungGenSizer::adjust_max_new_size(uint number_of_heap_regions) { 115 116 // We need to pass the desired values because recalculation may not update these 117 // values in some cases. 118 uint temp = _min_desired_young_length; 119 uint result = _max_desired_young_length; 120 recalculate_min_max_young_length(number_of_heap_regions, &temp, &result); 121 122 size_t max_young_size = result * HeapRegion::GrainBytes; 123 if (max_young_size != MaxNewSize) { 124 FLAG_SET_ERGO(size_t, MaxNewSize, max_young_size); 125 } 126 } 127 128 void G1YoungGenSizer::heap_size_changed(uint new_number_of_heap_regions) { 129 recalculate_min_max_young_length(new_number_of_heap_regions, &_min_desired_young_length, 130 &_max_desired_young_length); 131 } 132 133 G1YoungGenSizer* G1YoungGenSizer::create_gen_sizer(G1CollectorPolicy* policy) { 134 if (policy->is_hetero_heap()) { 135 return new G1HeterogeneousHeapYoungGenSizer(); 136 } else { 137 return new G1YoungGenSizer(); 138 } 139 }