1 /* 2 * Copyright (c) 2015, 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/heapRegionBounds.inline.hpp" 27 #include "gc/g1/jvmFlagConstraintsG1.hpp" 28 #include "runtime/globals.hpp" 29 #include "utilities/globalDefinitions.hpp" 30 31 JVMFlag::Error G1RSetRegionEntriesConstraintFunc(intx value, bool verbose) { 32 if (!UseG1GC) return JVMFlag::SUCCESS; 33 34 // Default value of G1RSetRegionEntries=0 means will be set ergonomically. 35 // Minimum value is 1. 36 if (FLAG_IS_CMDLINE(G1RSetRegionEntries) && (value < 1)) { 37 JVMFlag::printError(verbose, 38 "G1RSetRegionEntries (" INTX_FORMAT ") must be " 39 "greater than or equal to 1\n", 40 value); 41 return JVMFlag::VIOLATES_CONSTRAINT; 42 } else { 43 return JVMFlag::SUCCESS; 44 } 45 } 46 47 JVMFlag::Error G1RSetSparseRegionEntriesConstraintFunc(intx value, bool verbose) { 48 if (!UseG1GC) return JVMFlag::SUCCESS; 49 50 // Default value of G1RSetSparseRegionEntries=0 means will be set ergonomically. 51 // Minimum value is 1. 52 if (FLAG_IS_CMDLINE(G1RSetSparseRegionEntries) && (value < 1)) { 53 JVMFlag::printError(verbose, 54 "G1RSetSparseRegionEntries (" INTX_FORMAT ") must be " 55 "greater than or equal to 1\n", 56 value); 57 return JVMFlag::VIOLATES_CONSTRAINT; 58 } else { 59 return JVMFlag::SUCCESS; 60 } 61 } 62 63 JVMFlag::Error G1HeapRegionSizeConstraintFunc(size_t value, bool verbose) { 64 if (!UseG1GC) return JVMFlag::SUCCESS; 65 66 // Default value of G1HeapRegionSize=0 means will be set ergonomically. 67 if (FLAG_IS_CMDLINE(G1HeapRegionSize) && (value < HeapRegionBounds::min_size())) { 68 JVMFlag::printError(verbose, 69 "G1HeapRegionSize (" SIZE_FORMAT ") must be " 70 "greater than or equal to ergonomic heap region minimum size\n", 71 value); 72 return JVMFlag::VIOLATES_CONSTRAINT; 73 } else { 74 return JVMFlag::SUCCESS; 75 } 76 } 77 78 JVMFlag::Error G1NewSizePercentConstraintFunc(uintx value, bool verbose) { 79 if (!UseG1GC) return JVMFlag::SUCCESS; 80 81 if (value > G1MaxNewSizePercent) { 82 JVMFlag::printError(verbose, 83 "G1NewSizePercent (" UINTX_FORMAT ") must be " 84 "less than or equal to G1MaxNewSizePercent (" UINTX_FORMAT ")\n", 85 value, G1MaxNewSizePercent); 86 return JVMFlag::VIOLATES_CONSTRAINT; 87 } else { 88 return JVMFlag::SUCCESS; 89 } 90 } 91 92 JVMFlag::Error G1MaxNewSizePercentConstraintFunc(uintx value, bool verbose) { 93 if (!UseG1GC) return JVMFlag::SUCCESS; 94 95 if (value < G1NewSizePercent) { 96 JVMFlag::printError(verbose, 97 "G1MaxNewSizePercent (" UINTX_FORMAT ") must be " 98 "greater than or equal to G1NewSizePercent (" UINTX_FORMAT ")\n", 99 value, G1NewSizePercent); 100 return JVMFlag::VIOLATES_CONSTRAINT; 101 } else { 102 return JVMFlag::SUCCESS; 103 } 104 } 105 106 JVMFlag::Error MaxGCPauseMillisConstraintFuncG1(uintx value, bool verbose) { 107 if (UseG1GC && FLAG_IS_CMDLINE(MaxGCPauseMillis) && (value >= GCPauseIntervalMillis)) { 108 JVMFlag::printError(verbose, 109 "MaxGCPauseMillis (" UINTX_FORMAT ") must be " 110 "less than GCPauseIntervalMillis (" UINTX_FORMAT ")\n", 111 value, GCPauseIntervalMillis); 112 return JVMFlag::VIOLATES_CONSTRAINT; 113 } 114 115 return JVMFlag::SUCCESS; 116 } 117 118 JVMFlag::Error GCPauseIntervalMillisConstraintFuncG1(uintx value, bool verbose) { 119 if (UseG1GC) { 120 if (FLAG_IS_CMDLINE(GCPauseIntervalMillis)) { 121 if (value < 1) { 122 JVMFlag::printError(verbose, 123 "GCPauseIntervalMillis (" UINTX_FORMAT ") must be " 124 "greater than or equal to 1\n", 125 value); 126 return JVMFlag::VIOLATES_CONSTRAINT; 127 } 128 129 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 130 JVMFlag::printError(verbose, 131 "GCPauseIntervalMillis cannot be set " 132 "without setting MaxGCPauseMillis\n"); 133 return JVMFlag::VIOLATES_CONSTRAINT; 134 } 135 136 if (value <= MaxGCPauseMillis) { 137 JVMFlag::printError(verbose, 138 "GCPauseIntervalMillis (" UINTX_FORMAT ") must be " 139 "greater than MaxGCPauseMillis (" UINTX_FORMAT ")\n", 140 value, MaxGCPauseMillis); 141 return JVMFlag::VIOLATES_CONSTRAINT; 142 } 143 } 144 } 145 146 return JVMFlag::SUCCESS; 147 } 148 149 JVMFlag::Error NewSizeConstraintFuncG1(size_t value, bool verbose) { 150 #ifdef _LP64 151 // Overflow would happen for uint type variable of YoungGenSizer::_min_desired_young_length 152 // when the value to be assigned exceeds uint range. 153 // i.e. result of '(uint)(NewSize / region size(1~32MB))' 154 // So maximum of NewSize should be 'max_juint * 1M' 155 if (UseG1GC && (value > (max_juint * 1 * M))) { 156 JVMFlag::printError(verbose, 157 "NewSize (" SIZE_FORMAT ") must be less than ergonomic maximum value\n", 158 value); 159 return JVMFlag::VIOLATES_CONSTRAINT; 160 } 161 #endif // _LP64 162 return JVMFlag::SUCCESS; 163 } 164 165 size_t MaxSizeForHeapAlignmentG1() { 166 return HeapRegionBounds::max_size(); 167 }