1 /*
2 * Copyright (c) 2005, 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 "classfile/systemDictionary.hpp"
27 #include "gc/parallel/gcTaskManager.hpp"
28 #include "gc/parallel/objectStartArray.hpp"
29 #include "gc/parallel/parMarkBitMap.inline.hpp"
30 #include "gc/parallel/parallelScavengeHeap.hpp"
31 #include "gc/parallel/psCompactionManager.inline.hpp"
32 #include "gc/parallel/psOldGen.hpp"
33 #include "gc/parallel/psParallelCompact.inline.hpp"
34 #include "gc/shared/taskqueue.inline.hpp"
35 #include "logging/log.hpp"
36 #include "memory/iterator.inline.hpp"
37 #include "oops/access.inline.hpp"
38 #include "oops/compressedOops.inline.hpp"
39 #include "oops/instanceKlass.inline.hpp"
40 #include "oops/instanceMirrorKlass.inline.hpp"
41 #include "oops/objArrayKlass.inline.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "oops/valueArrayKlass.inline.hpp"
44 #include "runtime/atomic.hpp"
45
46 PSOldGen* ParCompactionManager::_old_gen = NULL;
47 ParCompactionManager** ParCompactionManager::_manager_array = NULL;
48
49 OopTaskQueueSet* ParCompactionManager::_stack_array = NULL;
50 ParCompactionManager::ObjArrayTaskQueueSet*
51 ParCompactionManager::_objarray_queues = NULL;
52 ObjectStartArray* ParCompactionManager::_start_array = NULL;
53 ParMarkBitMap* ParCompactionManager::_mark_bitmap = NULL;
54 RegionTaskQueueSet* ParCompactionManager::_region_array = NULL;
55
56 ParCompactionManager::ParCompactionManager() :
57 _action(CopyAndUpdate) {
58
59 ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
60
61 _old_gen = heap->old_gen();
62 _start_array = old_gen()->start_array();
63
64 marking_stack()->initialize();
65 _objarray_stack.initialize();
66 _region_stack.initialize();
67
68 reset_bitmap_query_cache();
69 }
70
71 void ParCompactionManager::initialize(ParMarkBitMap* mbm) {
72 assert(PSParallelCompact::gc_task_manager() != NULL,
73 "Needed for initialization");
74
75 _mark_bitmap = mbm;
76
77 uint parallel_gc_threads = PSParallelCompact::gc_task_manager()->workers();
78
79 assert(_manager_array == NULL, "Attempt to initialize twice");
80 _manager_array = NEW_C_HEAP_ARRAY(ParCompactionManager*, parallel_gc_threads+1, mtGC);
81 guarantee(_manager_array != NULL, "Could not allocate manager_array");
82
83 _stack_array = new OopTaskQueueSet(parallel_gc_threads);
84 guarantee(_stack_array != NULL, "Could not allocate stack_array");
85 _objarray_queues = new ObjArrayTaskQueueSet(parallel_gc_threads);
86 guarantee(_objarray_queues != NULL, "Could not allocate objarray_queues");
87 _region_array = new RegionTaskQueueSet(parallel_gc_threads);
88 guarantee(_region_array != NULL, "Could not allocate region_array");
89
90 // Create and register the ParCompactionManager(s) for the worker threads.
91 for(uint i=0; i<parallel_gc_threads; i++) {
92 _manager_array[i] = new ParCompactionManager();
93 guarantee(_manager_array[i] != NULL, "Could not create ParCompactionManager");
94 stack_array()->register_queue(i, _manager_array[i]->marking_stack());
95 _objarray_queues->register_queue(i, &_manager_array[i]->_objarray_stack);
96 region_array()->register_queue(i, _manager_array[i]->region_stack());
97 }
98
99 // The VMThread gets its own ParCompactionManager, which is not available
100 // for work stealing.
101 _manager_array[parallel_gc_threads] = new ParCompactionManager();
102 guarantee(_manager_array[parallel_gc_threads] != NULL,
103 "Could not create ParCompactionManager");
104 assert(PSParallelCompact::gc_task_manager()->workers() != 0,
105 "Not initialized?");
106 }
107
108 void ParCompactionManager::reset_all_bitmap_query_caches() {
109 uint parallel_gc_threads = PSParallelCompact::gc_task_manager()->workers();
110 for (uint i=0; i<=parallel_gc_threads; i++) {
111 _manager_array[i]->reset_bitmap_query_cache();
112 }
113 }
114
115 bool ParCompactionManager::should_update() {
116 assert(action() != NotValid, "Action is not set");
117 return (action() == ParCompactionManager::Update) ||
118 (action() == ParCompactionManager::CopyAndUpdate) ||
119 (action() == ParCompactionManager::UpdateAndCopy);
120 }
121
122 bool ParCompactionManager::should_copy() {
123 assert(action() != NotValid, "Action is not set");
124 return (action() == ParCompactionManager::Copy) ||
125 (action() == ParCompactionManager::CopyAndUpdate) ||
126 (action() == ParCompactionManager::UpdateAndCopy);
127 }
128
129 ParCompactionManager*
130 ParCompactionManager::gc_thread_compaction_manager(uint index) {
131 assert(index < ParallelGCThreads, "index out of range");
132 assert(_manager_array != NULL, "Sanity");
133 return _manager_array[index];
134 }
135
136 void ParCompactionManager::follow_marking_stacks() {
137 do {
138 // Drain the overflow stack first, to allow stealing from the marking stack.
139 oop obj;
140 while (marking_stack()->pop_overflow(obj)) {
141 follow_contents(obj);
142 }
143 while (marking_stack()->pop_local(obj)) {
144 follow_contents(obj);
145 }
146
147 // Process ObjArrays one at a time to avoid marking stack bloat.
148 ObjArrayTask task;
149 if (_objarray_stack.pop_overflow(task) || _objarray_stack.pop_local(task)) {
150 follow_array((objArrayOop)task.obj(), task.index());
151 }
152 } while (!marking_stacks_empty());
153
154 assert(marking_stacks_empty(), "Sanity");
155 }
156
157 void ParCompactionManager::drain_region_stacks() {
158 do {
159 // Drain overflow stack first so other threads can steal.
160 size_t region_index;
161 while (region_stack()->pop_overflow(region_index)) {
162 PSParallelCompact::fill_and_update_region(this, region_index);
163 }
164
165 while (region_stack()->pop_local(region_index)) {
166 PSParallelCompact::fill_and_update_region(this, region_index);
167 }
168 } while (!region_stack()->is_empty());
169 }