1 /* 2 * Copyright (c) 2017, 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/z/zArguments.hpp" 27 #include "gc/z/zCollectedHeap.hpp" 28 #include "gc/z/zCollectorPolicy.hpp" 29 #include "gc/z/zWorkers.hpp" 30 #include "gc/shared/gcArguments.inline.hpp" 31 #include "runtime/globals.hpp" 32 #include "runtime/globals_extension.hpp" 33 34 size_t ZArguments::conservative_max_heap_alignment() { 35 return 0; 36 } 37 38 void ZArguments::initialize() { 39 GCArguments::initialize(); 40 41 // Enable NUMA by default 42 if (FLAG_IS_DEFAULT(UseNUMA)) { 43 FLAG_SET_DEFAULT(UseNUMA, true); 44 } 45 46 // Disable biased locking by default 47 if (FLAG_IS_DEFAULT(UseBiasedLocking)) { 48 FLAG_SET_DEFAULT(UseBiasedLocking, false); 49 } 50 51 // Select number of parallel threads 52 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 53 FLAG_SET_DEFAULT(ParallelGCThreads, ZWorkers::calculate_nparallel()); 54 } 55 56 if (ParallelGCThreads == 0) { 57 vm_exit_during_initialization("The flag -XX:+UseZGC can not be combined with -XX:ParallelGCThreads=0"); 58 } 59 60 // Select number of concurrent threads 61 if (FLAG_IS_DEFAULT(ConcGCThreads)) { 62 FLAG_SET_DEFAULT(ConcGCThreads, ZWorkers::calculate_nconcurrent()); 63 } 64 65 if (ConcGCThreads == 0) { 66 vm_exit_during_initialization("The flag -XX:+UseZGC can not be combined with -XX:ConcGCThreads=0"); 67 } 68 69 #ifdef COMPILER2 70 // Enable loop strip mining by default 71 if (FLAG_IS_DEFAULT(UseCountedLoopSafepoints)) { 72 FLAG_SET_DEFAULT(UseCountedLoopSafepoints, true); 73 if (FLAG_IS_DEFAULT(LoopStripMiningIter)) { 74 FLAG_SET_DEFAULT(LoopStripMiningIter, 1000); 75 } 76 } 77 #endif 78 79 // To avoid asserts in set_active_workers() 80 FLAG_SET_DEFAULT(UseDynamicNumberOfGCThreads, true); 81 82 // CompressedOops/UseCompressedClassPointers not supported 83 FLAG_SET_DEFAULT(UseCompressedOops, false); 84 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 85 86 // ClassUnloading not (yet) supported 87 FLAG_SET_DEFAULT(ClassUnloading, false); 88 FLAG_SET_DEFAULT(ClassUnloadingWithConcurrentMark, false); 89 90 // Verification before startup and after exit not (yet) supported 91 FLAG_SET_DEFAULT(VerifyDuringStartup, false); 92 FLAG_SET_DEFAULT(VerifyBeforeExit, false); 93 94 // Verification before heap iteration not (yet) supported, for the 95 // same reason we need fixup_partial_loads 96 FLAG_SET_DEFAULT(VerifyBeforeIteration, false); 97 98 // Verification of stacks not (yet) supported, for the same reason 99 // we need fixup_partial_loads 100 DEBUG_ONLY(FLAG_SET_DEFAULT(VerifyStack, false)); 101 } 102 103 CollectedHeap* ZArguments::create_heap() { 104 return create_heap_with_policy<ZCollectedHeap, ZCollectorPolicy>(); 105 }