1 /* 2 * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates. 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_flags() { 39 GCArguments::initialize_flags(); 40 41 // Enable load barriers by default. Turn off only for debugging. 42 if (FLAG_IS_DEFAULT(UseLoadBarrier)) { 43 FLAG_SET_DEFAULT(UseLoadBarrier, true); 44 } 45 46 // Enable NUMA by default 47 if (FLAG_IS_DEFAULT(UseNUMA)) { 48 FLAG_SET_DEFAULT(UseNUMA, true); 49 } 50 51 // Disable biased locking by default 52 if (FLAG_IS_DEFAULT(UseBiasedLocking)) { 53 FLAG_SET_DEFAULT(UseBiasedLocking, false); 54 } 55 56 // Select number of parallel threads 57 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 58 FLAG_SET_DEFAULT(ParallelGCThreads, ZWorkers::calculate_nparallel()); 59 } 60 61 // Select number of concurrent threads 62 if (FLAG_IS_DEFAULT(ConcGCThreads)) { 63 FLAG_SET_DEFAULT(ConcGCThreads, ZWorkers::calculate_nconcurrent()); 64 } 65 66 // To avoid asserts in set_active_workers() 67 FLAG_SET_DEFAULT(UseDynamicNumberOfGCThreads, true); 68 69 // CompressedOops/UseCompressedClassPointers not supported 70 FLAG_SET_DEFAULT(UseCompressedOops, false); 71 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 72 73 // Verification before exit not (yet) supported 74 FLAG_SET_DEFAULT(VerifyBeforeExit, false); 75 } 76 77 CollectedHeap* ZArguments::create_heap() { 78 return create_heap_with_policy<ZCollectedHeap, ZCollectorPolicy>(); 79 }