1 /* 2 * Copyright (c) 2000, 2015, 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 "classfile/stringTable.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "code/codeCache.hpp" 29 #include "gc_interface/collectedHeap.inline.hpp" 30 #include "memory/sharedHeap.hpp" 31 #include "oops/oop.inline.hpp" 32 #include "runtime/atomic.inline.hpp" 33 #include "runtime/fprofiler.hpp" 34 #include "runtime/java.hpp" 35 #include "utilities/copy.hpp" 36 #include "utilities/workgroup.hpp" 37 38 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 39 40 SharedHeap* SharedHeap::_sh; 41 42 SharedHeap::SharedHeap(CollectorPolicy* policy_) : 43 CollectedHeap(), 44 _collector_policy(policy_), 45 _strong_roots_parity(0), 46 _workers(NULL) 47 { 48 _sh = this; // ch is static, should be set only once. 49 if (UseConcMarkSweepGC || UseG1GC) { 50 _workers = new FlexibleWorkGang("GC Thread", ParallelGCThreads, 51 /* are_GC_task_threads */true, 52 /* are_ConcurrentGC_threads */false); 53 if (_workers == NULL) { 54 vm_exit_during_initialization("Failed necessary allocation."); 55 } else { 56 _workers->initialize_workers(); 57 } 58 } 59 } 60 61 bool SharedHeap::heap_lock_held_for_gc() { 62 Thread* t = Thread::current(); 63 return Heap_lock->owned_by_self() 64 || ( (t->is_GC_task_thread() || t->is_VM_thread()) 65 && _thread_holds_heap_lock_for_gc); 66 } 67 68 void SharedHeap::set_par_threads(uint t) { 69 assert(t == 0 || !UseSerialGC, "Cannot have parallel threads"); 70 _n_par_threads = t; 71 } 72 73 void SharedHeap::change_strong_roots_parity() { 74 // Also set the new collection parity. 75 assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2, 76 "Not in range."); 77 _strong_roots_parity++; 78 if (_strong_roots_parity == 3) _strong_roots_parity = 1; 79 assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2, 80 "Not in range."); 81 } 82 83 SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* heap, bool activate) 84 : MarkScope(activate), _sh(heap) 85 { 86 if (_active) { 87 _sh->change_strong_roots_parity(); 88 // Zero the claimed high water mark in the StringTable 89 StringTable::clear_parallel_claimed_index(); 90 } 91 } 92 93 void SharedHeap::set_barrier_set(BarrierSet* bs) { 94 _barrier_set = bs; 95 // Cached barrier set for fast access in oops 96 oopDesc::set_bs(bs); 97 } 98 99 void SharedHeap::post_initialize() { 100 CollectedHeap::post_initialize(); 101 ref_processing_init(); 102 } 103 104 void SharedHeap::ref_processing_init() {} 105 106 // Some utilities. 107 void SharedHeap::print_size_transition(outputStream* out, 108 size_t bytes_before, 109 size_t bytes_after, 110 size_t capacity) { 111 out->print(" " SIZE_FORMAT "%s->" SIZE_FORMAT "%s(" SIZE_FORMAT "%s)", 112 byte_size_in_proper_unit(bytes_before), 113 proper_unit_for_byte_size(bytes_before), 114 byte_size_in_proper_unit(bytes_after), 115 proper_unit_for_byte_size(bytes_after), 116 byte_size_in_proper_unit(capacity), 117 proper_unit_for_byte_size(capacity)); 118 }