1 /* 2 * Copyright (c) 2017, 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 #include "precompiled.hpp" 25 #include "gc/z/zAddressSpaceLimit.hpp" 26 #include "gc/z/zArguments.hpp" 27 #include "gc/z/zCollectedHeap.hpp" 28 #include "gc/z/zHeuristics.hpp" 29 #include "gc/shared/gcArguments.hpp" 30 #include "runtime/globals.hpp" 31 #include "runtime/globals_extension.hpp" 32 33 void ZArguments::initialize_alignments() { 34 SpaceAlignment = ZGranuleSize; 35 HeapAlignment = SpaceAlignment; 36 } 37 38 void ZArguments::initialize() { 39 GCArguments::initialize(); 40 41 // Check mark stack size 42 const size_t mark_stack_space_limit = ZAddressSpaceLimit::mark_stack(); 43 if (ZMarkStackSpaceLimit > mark_stack_space_limit) { 44 if (!FLAG_IS_DEFAULT(ZMarkStackSpaceLimit)) { 45 vm_exit_during_initialization("ZMarkStackSpaceLimit too large for limited address space"); 46 } 47 FLAG_SET_DEFAULT(ZMarkStackSpaceLimit, mark_stack_space_limit); 48 } 49 50 // Enable NUMA by default 51 if (FLAG_IS_DEFAULT(UseNUMA)) { 52 FLAG_SET_DEFAULT(UseNUMA, true); 53 } 54 55 // Disable biased locking by default 56 if (FLAG_IS_DEFAULT(UseBiasedLocking)) { 57 FLAG_SET_DEFAULT(UseBiasedLocking, false); 58 } 59 60 // Select number of parallel threads 61 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 62 FLAG_SET_DEFAULT(ParallelGCThreads, ZHeuristics::nparallel_workers()); 63 } 64 65 if (ParallelGCThreads == 0) { 66 vm_exit_during_initialization("The flag -XX:+UseZGC can not be combined with -XX:ParallelGCThreads=0"); 67 } 68 69 // Select number of concurrent threads 70 if (FLAG_IS_DEFAULT(ConcGCThreads)) { 71 FLAG_SET_DEFAULT(ConcGCThreads, ZHeuristics::nconcurrent_workers()); 72 } 73 74 if (ConcGCThreads == 0) { 75 vm_exit_during_initialization("The flag -XX:+UseZGC can not be combined with -XX:ConcGCThreads=0"); 76 } 77 78 #ifdef COMPILER2 79 // Enable loop strip mining by default 80 if (FLAG_IS_DEFAULT(UseCountedLoopSafepoints)) { 81 FLAG_SET_DEFAULT(UseCountedLoopSafepoints, true); 82 if (FLAG_IS_DEFAULT(LoopStripMiningIter)) { 83 FLAG_SET_DEFAULT(LoopStripMiningIter, 1000); 84 } 85 } 86 #endif 87 88 // CompressedOops/UseCompressedClassPointers not supported 89 FLAG_SET_DEFAULT(UseCompressedOops, false); 90 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 91 92 // Verification before startup and after exit not (yet) supported 93 FLAG_SET_DEFAULT(VerifyDuringStartup, false); 94 FLAG_SET_DEFAULT(VerifyBeforeExit, false); 95 96 // Verification before heap iteration not (yet) supported, for the 97 // same reason we need fixup_partial_loads 98 FLAG_SET_DEFAULT(VerifyBeforeIteration, false); 99 100 if (VerifyBeforeGC || VerifyDuringGC || VerifyAfterGC) { 101 FLAG_SET_DEFAULT(ZVerifyRoots, true); 102 FLAG_SET_DEFAULT(ZVerifyObjects, true); 103 } 104 105 // Verification of stacks not (yet) supported, for the same reason 106 // we need fixup_partial_loads 107 DEBUG_ONLY(FLAG_SET_DEFAULT(VerifyStack, false)); 108 109 // Initialize platform specific arguments 110 initialize_platform(); 111 } 112 113 size_t ZArguments::conservative_max_heap_alignment() { 114 return 0; 115 } 116 117 CollectedHeap* ZArguments::create_heap() { 118 return new ZCollectedHeap(); 119 }