1 /* 2 * Copyright (c) 2016, 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 #include "precompiled.hpp" 26 #include "gc/g1/g1Arguments.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 #include "runtime/globals.hpp" 32 33 G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults), 34 _use_adaptive_sizing(true), _min_desired_young_length(0), _max_desired_young_length(0) { 35 36 if (FLAG_IS_CMDLINE(NewRatio)) { 37 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { 38 log_warning(gc, ergo)("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); 39 } else { 40 _sizer_kind = SizerNewRatio; 41 _use_adaptive_sizing = false; 42 return; 43 } 44 } 45 46 if (NewSize > MaxNewSize) { 47 if (FLAG_IS_CMDLINE(MaxNewSize)) { 48 log_warning(gc, ergo)("NewSize (" SIZE_FORMAT "k) is greater than the MaxNewSize (" SIZE_FORMAT "k). " 49 "A new max generation size of " SIZE_FORMAT "k will be used.", 50 NewSize/K, MaxNewSize/K, NewSize/K); 51 } 52 FLAG_SET_ERGO(MaxNewSize, NewSize); 53 } 54 55 if (FLAG_IS_CMDLINE(NewSize)) { 56 _min_desired_young_length = MAX2((uint) (NewSize / HeapRegion::GrainBytes), 57 1U); 58 if (FLAG_IS_CMDLINE(MaxNewSize)) { 59 _max_desired_young_length = 60 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), 61 1U); 62 _sizer_kind = SizerMaxAndNewSize; 63 _use_adaptive_sizing = _min_desired_young_length != _max_desired_young_length; 64 } else { 65 _sizer_kind = SizerNewSizeOnly; 66 } 67 } else if (FLAG_IS_CMDLINE(MaxNewSize)) { 68 _max_desired_young_length = 69 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes), 70 1U); 71 _sizer_kind = SizerMaxNewSizeOnly; 72 } 73 } 74 75 uint G1YoungGenSizer::calculate_default_min_length(uint new_number_of_heap_regions) { 76 uint default_value = (new_number_of_heap_regions * G1NewSizePercent) / 100; 77 return MAX2(1U, default_value); 78 } 79 80 uint G1YoungGenSizer::calculate_default_max_length(uint new_number_of_heap_regions) { 81 uint default_value = (new_number_of_heap_regions * G1MaxNewSizePercent) / 100; 82 return MAX2(1U, default_value); 83 } 84 85 void G1YoungGenSizer::recalculate_min_max_young_length(uint number_of_heap_regions, uint* min_young_length, uint* max_young_length) { 86 assert(number_of_heap_regions > 0, "Heap must be initialized"); 87 88 switch (_sizer_kind) { 89 case SizerDefaults: 90 *min_young_length = calculate_default_min_length(number_of_heap_regions); 91 *max_young_length = calculate_default_max_length(number_of_heap_regions); 92 break; 93 case SizerNewSizeOnly: 94 *max_young_length = calculate_default_max_length(number_of_heap_regions); 95 *max_young_length = MAX2(*min_young_length, *max_young_length); 96 break; 97 case SizerMaxNewSizeOnly: 98 *min_young_length = calculate_default_min_length(number_of_heap_regions); 99 *min_young_length = MIN2(*min_young_length, *max_young_length); 100 break; 101 case SizerMaxAndNewSize: 102 // Do nothing. Values set on the command line, don't update them at runtime. 103 break; 104 case SizerNewRatio: 105 *min_young_length = number_of_heap_regions / (NewRatio + 1); 106 *max_young_length = *min_young_length; 107 break; 108 default: 109 ShouldNotReachHere(); 110 } 111 112 assert(*min_young_length <= *max_young_length, "Invalid min/max young gen size values"); 113 } 114 115 void G1YoungGenSizer::adjust_max_new_size(uint number_of_heap_regions) { 116 117 // We need to pass the desired values because recalculation may not update these 118 // values in some cases. 119 uint temp = _min_desired_young_length; 120 uint result = _max_desired_young_length; 121 recalculate_min_max_young_length(number_of_heap_regions, &temp, &result); 122 123 size_t max_young_size = result * HeapRegion::GrainBytes; 124 if (max_young_size != MaxNewSize) { 125 FLAG_SET_ERGO(MaxNewSize, max_young_size); 126 } 127 } 128 129 void G1YoungGenSizer::heap_size_changed(uint new_number_of_heap_regions) { 130 recalculate_min_max_young_length(new_number_of_heap_regions, &_min_desired_young_length, 131 &_max_desired_young_length); 132 } 133 134 G1YoungGenSizer* G1YoungGenSizer::create_gen_sizer() { 135 if (G1Arguments::is_heterogeneous_heap()) { 136 return new G1HeterogeneousHeapYoungGenSizer(); 137 } else { 138 return new G1YoungGenSizer(); 139 } 140 }