diff -r 000000000000 -r f90c822e73f8 src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.hpp Wed Apr 27 01:25:04 2016 +0800 @@ -0,0 +1,212 @@ +/* + * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSCOMPACTIONMANAGER_HPP +#define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSCOMPACTIONMANAGER_HPP + +#include "memory/allocation.hpp" +#include "utilities/stack.hpp" +#include "utilities/taskqueue.hpp" + +// Move to some global location +#define HAS_BEEN_MOVED 0x1501d01d +// End move to some global location + + +class MutableSpace; +class PSOldGen; +class ParCompactionManager; +class ObjectStartArray; +class ParallelCompactData; +class ParMarkBitMap; + +class ParCompactionManager : public CHeapObj { + friend class ParallelTaskTerminator; + friend class ParMarkBitMap; + friend class PSParallelCompact; + friend class StealRegionCompactionTask; + friend class UpdateAndFillClosure; + friend class RefProcTaskExecutor; + friend class IdleGCTask; + + public: + +// ------------------------ Don't putback if not needed + // Actions that the compaction manager should take. + enum Action { + Update, + Copy, + UpdateAndCopy, + CopyAndUpdate, + NotValid + }; +// ------------------------ End don't putback if not needed + + private: + // 32-bit: 4K * 8 = 32KiB; 64-bit: 8K * 16 = 128KiB + #define QUEUE_SIZE (1 << NOT_LP64(12) LP64_ONLY(13)) + typedef OverflowTaskQueue ObjArrayTaskQueue; + typedef GenericTaskQueueSet ObjArrayTaskQueueSet; + #undef QUEUE_SIZE + + static ParCompactionManager** _manager_array; + static OopTaskQueueSet* _stack_array; + static ObjArrayTaskQueueSet* _objarray_queues; + static ObjectStartArray* _start_array; + static RegionTaskQueueSet* _region_array; + static PSOldGen* _old_gen; + +private: + OverflowTaskQueue _marking_stack; + ObjArrayTaskQueue _objarray_stack; + + // Is there a way to reuse the _marking_stack for the + // saving empty regions? For now just create a different + // type of TaskQueue. + RegionTaskQueue* _region_stack; + + static RegionTaskQueue** _region_list; + // Index in _region_list for current _region_stack. + uint _region_stack_index; + + // Indexes of recycled region stacks/overflow stacks + // Stacks of regions to be compacted are embedded in the tasks doing + // the compaction. A thread that executes the task extracts the + // region stack and drains it. These threads keep these region + // stacks for use during compaction task stealing. If a thread + // gets a second draining task, it pushed its current region stack + // index into the array _recycled_stack_index and gets a new + // region stack from the task. A thread that is executing a + // compaction stealing task without ever having executing a + // draining task, will get a region stack from _recycled_stack_index. + // + // Array of indexes into the array of region stacks. + static uint* _recycled_stack_index; + // The index into _recycled_stack_index of the last region stack index + // pushed. If -1, there are no entries into _recycled_stack_index. + static int _recycled_top; + // The index into _recycled_stack_index of the last region stack index + // popped. If -1, there has not been any entry popped. + static int _recycled_bottom; + + static ParMarkBitMap* _mark_bitmap; + + Action _action; + + static PSOldGen* old_gen() { return _old_gen; } + static ObjectStartArray* start_array() { return _start_array; } + static OopTaskQueueSet* stack_array() { return _stack_array; } + + static void initialize(ParMarkBitMap* mbm); + + protected: + // Array of tasks. Needed by the ParallelTaskTerminator. + static RegionTaskQueueSet* region_array() { return _region_array; } + OverflowTaskQueue* marking_stack() { return &_marking_stack; } + + // Pushes onto the marking stack. If the marking stack is full, + // pushes onto the overflow stack. + void stack_push(oop obj); + // Do not implement an equivalent stack_pop. Deal with the + // marking stack and overflow stack directly. + + public: + Action action() { return _action; } + void set_action(Action v) { _action = v; } + + RegionTaskQueue* region_stack() { return _region_stack; } + void set_region_stack(RegionTaskQueue* v) { _region_stack = v; } + + inline static ParCompactionManager* manager_array(int index); + + inline static RegionTaskQueue* region_list(int index) { + return _region_list[index]; + } + + uint region_stack_index() { return _region_stack_index; } + void set_region_stack_index(uint v) { _region_stack_index = v; } + + // Pop and push unique reusable stack index + static int pop_recycled_stack_index(); + static void push_recycled_stack_index(uint v); + static void reset_recycled_stack_index() { + _recycled_bottom = _recycled_top = -1; + } + + ParCompactionManager(); + ~ParCompactionManager(); + + // Pushes onto the region stack at the given index. If the + // region stack is full, + // pushes onto the region overflow stack. + static void region_list_push(uint stack_index, size_t region_index); + static void verify_region_list_empty(uint stack_index); + ParMarkBitMap* mark_bitmap() { return _mark_bitmap; } + + // void drain_stacks(); + + bool should_update(); + bool should_copy(); + + // Save for later processing. Must not fail. + inline void push(oop obj) { _marking_stack.push(obj); } + inline void push_objarray(oop objarray, size_t index); + inline void push_region(size_t index); + + // Access function for compaction managers + static ParCompactionManager* gc_thread_compaction_manager(int index); + + static bool steal(int queue_num, int* seed, oop& t) { + return stack_array()->steal(queue_num, seed, t); + } + + static bool steal_objarray(int queue_num, int* seed, ObjArrayTask& t) { + return _objarray_queues->steal(queue_num, seed, t); + } + + static bool steal(int queue_num, int* seed, size_t& region) { + return region_array()->steal(queue_num, seed, region); + } + + // Process tasks remaining on any marking stack + void follow_marking_stacks(); + inline bool marking_stacks_empty() const; + + // Process tasks remaining on any stack + void drain_region_stacks(); + +}; + +inline ParCompactionManager* ParCompactionManager::manager_array(int index) { + assert(_manager_array != NULL, "access of NULL manager_array"); + assert(index >= 0 && index <= (int)ParallelGCThreads, + "out of range manager_array access"); + return _manager_array[index]; +} + +bool ParCompactionManager::marking_stacks_empty() const { + return _marking_stack.is_empty() && _objarray_stack.is_empty(); +} + +#endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSCOMPACTIONMANAGER_HPP