author | tonyp |
Thu, 22 Jul 2010 10:27:41 -0400 | |
changeset 6248 | 2e661807cef0 |
parent 5918 | 73b96456819a |
child 6762 | f8d1b560700e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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// Move to some global location |
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#define HAS_BEEN_MOVED 0x1501d01d |
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// End move to some global location |
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class MutableSpace; |
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class PSOldGen; |
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class ParCompactionManager; |
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class ObjectStartArray; |
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class ParallelCompactData; |
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class ParMarkBitMap; |
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class ParCompactionManager : public CHeapObj { |
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friend class ParallelTaskTerminator; |
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friend class ParMarkBitMap; |
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friend class PSParallelCompact; |
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friend class StealRegionCompactionTask; |
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friend class UpdateAndFillClosure; |
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friend class RefProcTaskExecutor; |
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public: |
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// ------------------------ Don't putback if not needed |
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// Actions that the compaction manager should take. |
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enum Action { |
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Update, |
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Copy, |
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UpdateAndCopy, |
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CopyAndUpdate, |
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VerifyUpdate, |
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ResetObjects, |
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NotValid |
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}; |
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// ------------------------ End don't putback if not needed |
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private: |
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// 32-bit: 4K * 8 = 32KiB; 64-bit: 8K * 16 = 128KiB |
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#define QUEUE_SIZE (1 << NOT_LP64(12) LP64_ONLY(13)) |
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typedef OverflowTaskQueue<ObjArrayTask, QUEUE_SIZE> ObjArrayTaskQueue; |
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typedef GenericTaskQueueSet<ObjArrayTaskQueue> ObjArrayTaskQueueSet; |
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#undef QUEUE_SIZE |
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static ParCompactionManager** _manager_array; |
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static OopTaskQueueSet* _stack_array; |
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static ObjArrayTaskQueueSet* _objarray_queues; |
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static ObjectStartArray* _start_array; |
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static RegionTaskQueueSet* _region_array; |
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static PSOldGen* _old_gen; |
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private: |
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OverflowTaskQueue<oop> _marking_stack; |
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ObjArrayTaskQueue _objarray_stack; |
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// Is there a way to reuse the _marking_stack for the |
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// saving empty regions? For now just create a different |
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// type of TaskQueue. |
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RegionTaskQueue _region_stack; |
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#if 1 // does this happen enough to need a per thread stack? |
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GrowableArray<Klass*>* _revisit_klass_stack; |
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GrowableArray<DataLayout*>* _revisit_mdo_stack; |
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#endif |
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static ParMarkBitMap* _mark_bitmap; |
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Action _action; |
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static PSOldGen* old_gen() { return _old_gen; } |
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static ObjectStartArray* start_array() { return _start_array; } |
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static OopTaskQueueSet* stack_array() { return _stack_array; } |
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static void initialize(ParMarkBitMap* mbm); |
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protected: |
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// Array of tasks. Needed by the ParallelTaskTerminator. |
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static RegionTaskQueueSet* region_array() { return _region_array; } |
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OverflowTaskQueue<oop>* marking_stack() { return &_marking_stack; } |
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RegionTaskQueue* region_stack() { return &_region_stack; } |
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// Pushes onto the marking stack. If the marking stack is full, |
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// pushes onto the overflow stack. |
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void stack_push(oop obj); |
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// Do not implement an equivalent stack_pop. Deal with the |
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// marking stack and overflow stack directly. |
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public: |
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Action action() { return _action; } |
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void set_action(Action v) { _action = v; } |
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inline static ParCompactionManager* manager_array(int index); |
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ParCompactionManager(); |
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~ParCompactionManager(); |
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void allocate_stacks(); |
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void deallocate_stacks(); |
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ParMarkBitMap* mark_bitmap() { return _mark_bitmap; } |
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// Take actions in preparation for a compaction. |
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static void reset(); |
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// void drain_stacks(); |
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bool should_update(); |
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bool should_copy(); |
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bool should_verify_only(); |
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bool should_reset_only(); |
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#if 1 |
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// Probably stays as a growable array |
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GrowableArray<Klass*>* revisit_klass_stack() { return _revisit_klass_stack; } |
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GrowableArray<DataLayout*>* revisit_mdo_stack() { return _revisit_mdo_stack; } |
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#endif |
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// Save for later processing. Must not fail. |
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inline void push(oop obj) { _marking_stack.push(obj); } |
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inline void push_objarray(oop objarray, size_t index); |
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inline void push_region(size_t index); |
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// Access function for compaction managers |
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static ParCompactionManager* gc_thread_compaction_manager(int index); |
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static bool steal(int queue_num, int* seed, oop& t) { |
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return stack_array()->steal(queue_num, seed, t); |
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} |
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static bool steal_objarray(int queue_num, int* seed, ObjArrayTask& t) { |
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return _objarray_queues->steal(queue_num, seed, t); |
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} |
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static bool steal(int queue_num, int* seed, size_t& region) { |
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return region_array()->steal(queue_num, seed, region); |
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} |
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// Process tasks remaining on any marking stack |
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void follow_marking_stacks(); |
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inline bool marking_stacks_empty() const; |
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// Process tasks remaining on any stack |
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void drain_region_stacks(); |
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// Debugging support |
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#ifdef ASSERT |
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bool stacks_have_been_allocated(); |
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#endif |
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}; |
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inline ParCompactionManager* ParCompactionManager::manager_array(int index) { |
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assert(_manager_array != NULL, "access of NULL manager_array"); |
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assert(index >= 0 && index <= (int)ParallelGCThreads, |
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"out of range manager_array access"); |
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return _manager_array[index]; |
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} |
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bool ParCompactionManager::marking_stacks_empty() const { |
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return _marking_stack.is_empty() && _objarray_stack.is_empty(); |
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} |