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 32 void ZArguments::initialize_alignments() { 33 SpaceAlignment = ZGranuleSize; 34 HeapAlignment = SpaceAlignment; 35 } 36 37 void ZArguments::initialize() { 38 GCArguments::initialize(); 39 40 // Check mark stack size 41 const size_t mark_stack_space_limit = ZAddressSpaceLimit::mark_stack(); 42 if (ZMarkStackSpaceLimit > mark_stack_space_limit) { 43 if (!FLAG_IS_DEFAULT(ZMarkStackSpaceLimit)) { 44 vm_exit_during_initialization("ZMarkStackSpaceLimit too large for limited address space"); 45 } 46 FLAG_SET_DEFAULT(ZMarkStackSpaceLimit, mark_stack_space_limit); 47 } 48 49 // Enable NUMA by default 50 if (FLAG_IS_DEFAULT(UseNUMA)) { 51 FLAG_SET_DEFAULT(UseNUMA, true); 52 } 53 54 // Disable biased locking by default 55 if (FLAG_IS_DEFAULT(UseBiasedLocking)) { 56 FLAG_SET_DEFAULT(UseBiasedLocking, false); 57 } 58 59 // Select number of parallel threads 60 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 61 FLAG_SET_DEFAULT(ParallelGCThreads, ZHeuristics::nparallel_workers()); 62 } 63 64 if (ParallelGCThreads == 0) { 65 vm_exit_during_initialization("The flag -XX:+UseZGC can not be combined with -XX:ParallelGCThreads=0"); 66 } 67 68 // Select number of concurrent threads 69 if (FLAG_IS_DEFAULT(ConcGCThreads)) { 70 FLAG_SET_DEFAULT(ConcGCThreads, ZHeuristics::nconcurrent_workers()); 71 } 72 73 if (ConcGCThreads == 0) { 74 vm_exit_during_initialization("The flag -XX:+UseZGC can not be combined with -XX:ConcGCThreads=0"); 75 } 76 77 #ifdef COMPILER2 78 // Enable loop strip mining by default 79 if (FLAG_IS_DEFAULT(UseCountedLoopSafepoints)) { 80 FLAG_SET_DEFAULT(UseCountedLoopSafepoints, true); 81 if (FLAG_IS_DEFAULT(LoopStripMiningIter)) { 82 FLAG_SET_DEFAULT(LoopStripMiningIter, 1000); 83 } 84 } 85 #endif 86 87 // CompressedOops/UseCompressedClassPointers not supported 88 FLAG_SET_DEFAULT(UseCompressedOops, false); 89 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 90 91 // Verification before startup and after exit not (yet) supported 92 FLAG_SET_DEFAULT(VerifyDuringStartup, false); 93 FLAG_SET_DEFAULT(VerifyBeforeExit, false); 94 95 // Verification before heap iteration not (yet) supported, for the 96 // same reason we need fixup_partial_loads 97 FLAG_SET_DEFAULT(VerifyBeforeIteration, false); 98 99 if (VerifyBeforeGC || VerifyDuringGC || VerifyAfterGC) { 100 FLAG_SET_DEFAULT(ZVerifyRoots, true); 101 FLAG_SET_DEFAULT(ZVerifyObjects, true); 102 } 103 104 // Verification of stacks not (yet) supported, for the same reason 105 // we need fixup_partial_loads 106 DEBUG_ONLY(FLAG_SET_DEFAULT(VerifyStack, false)); 107 108 // Initialize platform specific arguments 109 initialize_platform(); 110 } 111 112 size_t ZArguments::conservative_max_heap_alignment() { 113 return 0; 114 } 115 116 CollectedHeap* ZArguments::create_heap() { 117 return new ZCollectedHeap(); 118 } 119 120 bool ZArguments::is_supported() const { 121 return is_os_supported(); 122 }