Fri, 11 Mar 2011 16:35:18 +0100
6820066: Check that -XX:ParGCArrayScanChunk has a value larger than zero.
Summary: Check that -XX:ParGCArrayScanChunk has a value larger than zero.
Reviewed-by: johnc, jmasa, ysr
1 /*
2 * Copyright (c) 2005, 2010, 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
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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.
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23 */
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSCOMPACTIONMANAGER_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSCOMPACTIONMANAGER_HPP
28 #include "memory/allocation.hpp"
29 #include "utilities/stack.hpp"
30 #include "utilities/taskqueue.hpp"
32 // Move to some global location
33 #define HAS_BEEN_MOVED 0x1501d01d
34 // End move to some global location
37 class MutableSpace;
38 class PSOldGen;
39 class ParCompactionManager;
40 class ObjectStartArray;
41 class ParallelCompactData;
42 class ParMarkBitMap;
44 class ParCompactionManager : public CHeapObj {
45 friend class ParallelTaskTerminator;
46 friend class ParMarkBitMap;
47 friend class PSParallelCompact;
48 friend class StealRegionCompactionTask;
49 friend class UpdateAndFillClosure;
50 friend class RefProcTaskExecutor;
52 public:
54 // ------------------------ Don't putback if not needed
55 // Actions that the compaction manager should take.
56 enum Action {
57 Update,
58 Copy,
59 UpdateAndCopy,
60 CopyAndUpdate,
61 VerifyUpdate,
62 ResetObjects,
63 NotValid
64 };
65 // ------------------------ End don't putback if not needed
67 private:
68 // 32-bit: 4K * 8 = 32KiB; 64-bit: 8K * 16 = 128KiB
69 #define QUEUE_SIZE (1 << NOT_LP64(12) LP64_ONLY(13))
70 typedef OverflowTaskQueue<ObjArrayTask, QUEUE_SIZE> ObjArrayTaskQueue;
71 typedef GenericTaskQueueSet<ObjArrayTaskQueue> ObjArrayTaskQueueSet;
72 #undef QUEUE_SIZE
74 static ParCompactionManager** _manager_array;
75 static OopTaskQueueSet* _stack_array;
76 static ObjArrayTaskQueueSet* _objarray_queues;
77 static ObjectStartArray* _start_array;
78 static RegionTaskQueueSet* _region_array;
79 static PSOldGen* _old_gen;
81 private:
82 OverflowTaskQueue<oop> _marking_stack;
83 ObjArrayTaskQueue _objarray_stack;
85 // Is there a way to reuse the _marking_stack for the
86 // saving empty regions? For now just create a different
87 // type of TaskQueue.
88 RegionTaskQueue _region_stack;
90 Stack<Klass*> _revisit_klass_stack;
91 Stack<DataLayout*> _revisit_mdo_stack;
93 static ParMarkBitMap* _mark_bitmap;
95 Action _action;
97 static PSOldGen* old_gen() { return _old_gen; }
98 static ObjectStartArray* start_array() { return _start_array; }
99 static OopTaskQueueSet* stack_array() { return _stack_array; }
101 static void initialize(ParMarkBitMap* mbm);
103 protected:
104 // Array of tasks. Needed by the ParallelTaskTerminator.
105 static RegionTaskQueueSet* region_array() { return _region_array; }
106 OverflowTaskQueue<oop>* marking_stack() { return &_marking_stack; }
107 RegionTaskQueue* region_stack() { return &_region_stack; }
109 // Pushes onto the marking stack. If the marking stack is full,
110 // pushes onto the overflow stack.
111 void stack_push(oop obj);
112 // Do not implement an equivalent stack_pop. Deal with the
113 // marking stack and overflow stack directly.
115 public:
116 Action action() { return _action; }
117 void set_action(Action v) { _action = v; }
119 inline static ParCompactionManager* manager_array(int index);
121 ParCompactionManager();
123 ParMarkBitMap* mark_bitmap() { return _mark_bitmap; }
125 // Take actions in preparation for a compaction.
126 static void reset();
128 // void drain_stacks();
130 bool should_update();
131 bool should_copy();
132 bool should_verify_only();
133 bool should_reset_only();
135 Stack<Klass*>* revisit_klass_stack() { return &_revisit_klass_stack; }
136 Stack<DataLayout*>* revisit_mdo_stack() { return &_revisit_mdo_stack; }
138 // Save for later processing. Must not fail.
139 inline void push(oop obj) { _marking_stack.push(obj); }
140 inline void push_objarray(oop objarray, size_t index);
141 inline void push_region(size_t index);
143 // Access function for compaction managers
144 static ParCompactionManager* gc_thread_compaction_manager(int index);
146 static bool steal(int queue_num, int* seed, oop& t) {
147 return stack_array()->steal(queue_num, seed, t);
148 }
150 static bool steal_objarray(int queue_num, int* seed, ObjArrayTask& t) {
151 return _objarray_queues->steal(queue_num, seed, t);
152 }
154 static bool steal(int queue_num, int* seed, size_t& region) {
155 return region_array()->steal(queue_num, seed, region);
156 }
158 // Process tasks remaining on any marking stack
159 void follow_marking_stacks();
160 inline bool marking_stacks_empty() const;
162 // Process tasks remaining on any stack
163 void drain_region_stacks();
165 };
167 inline ParCompactionManager* ParCompactionManager::manager_array(int index) {
168 assert(_manager_array != NULL, "access of NULL manager_array");
169 assert(index >= 0 && index <= (int)ParallelGCThreads,
170 "out of range manager_array access");
171 return _manager_array[index];
172 }
174 bool ParCompactionManager::marking_stacks_empty() const {
175 return _marking_stack.is_empty() && _objarray_stack.is_empty();
176 }
178 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSCOMPACTIONMANAGER_HPP