1 /* 2 * Copyright (c) 2000, 2014, 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/symbolTable.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 _rem_set(NULL), 46 _strong_roots_parity(0), 47 _workers(NULL) 48 { 49 _sh = this; // ch is static, should be set only once. 50 if ((UseParNewGC || 51 (UseConcMarkSweepGC && (CMSParallelInitialMarkEnabled || 52 CMSParallelRemarkEnabled)) || 53 UseG1GC) && 54 ParallelGCThreads > 0) { 55 _workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads, 56 /* are_GC_task_threads */true, 57 /* are_ConcurrentGC_threads */false); 58 if (_workers == NULL) { 59 vm_exit_during_initialization("Failed necessary allocation."); 60 } else { 61 _workers->initialize_workers(); 62 } 63 } 64 } 65 66 bool SharedHeap::heap_lock_held_for_gc() { 67 Thread* t = Thread::current(); 68 return Heap_lock->owned_by_self() 69 || ( (t->is_GC_task_thread() || t->is_VM_thread()) 70 && _thread_holds_heap_lock_for_gc); 71 } 72 73 void SharedHeap::set_par_threads(uint t) { 74 assert(t == 0 || !UseSerialGC, "Cannot have parallel threads"); 75 _n_par_threads = t; 76 } 77 78 void SharedHeap::change_strong_roots_parity() { 79 // Also set the new collection parity. 80 assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2, 81 "Not in range."); 82 _strong_roots_parity++; 83 if (_strong_roots_parity == 3) _strong_roots_parity = 1; 84 assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2, 85 "Not in range."); 86 } 87 88 SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* heap, bool activate) 89 : MarkScope(activate), _sh(heap) 90 { 91 if (_active) { 92 _sh->change_strong_roots_parity(); 93 // Zero the claimed high water mark in the StringTable 94 StringTable::clear_parallel_claimed_index(); 95 } 96 } 97 98 void SharedHeap::set_barrier_set(BarrierSet* bs) { 99 _barrier_set = bs; 100 // Cached barrier set for fast access in oops 101 oopDesc::set_bs(bs); 102 } 103 104 void SharedHeap::post_initialize() { 105 CollectedHeap::post_initialize(); 106 ref_processing_init(); 107 } 108 109 void SharedHeap::ref_processing_init() {} 110 111 // Some utilities. 112 void SharedHeap::print_size_transition(outputStream* out, 113 size_t bytes_before, 114 size_t bytes_after, 115 size_t capacity) { 116 out->print(" %d%s->%d%s(%d%s)", 117 byte_size_in_proper_unit(bytes_before), 118 proper_unit_for_byte_size(bytes_before), 119 byte_size_in_proper_unit(bytes_after), 120 proper_unit_for_byte_size(bytes_after), 121 byte_size_in_proper_unit(capacity), 122 proper_unit_for_byte_size(capacity)); 123 }