| /* |
| * Copyright (c) 2002, 2013, 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_PSPROMOTIONMANAGER_HPP |
| #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_HPP |
| |
| #include "gc_implementation/parallelScavenge/psPromotionLAB.hpp" |
| #include "gc_implementation/shared/gcTrace.hpp" |
| #include "gc_implementation/shared/copyFailedInfo.hpp" |
| #include "memory/allocation.hpp" |
| #include "memory/padded.hpp" |
| #include "utilities/globalDefinitions.hpp" |
| #include "utilities/taskqueue.hpp" |
| |
| // |
| // psPromotionManager is used by a single thread to manage object survival |
| // during a scavenge. The promotion manager contains thread local data only. |
| // |
| // NOTE! Be careful when allocating the stacks on cheap. If you are going |
| // to use a promotion manager in more than one thread, the stacks MUST be |
| // on cheap. This can lead to memory leaks, though, as they are not auto |
| // deallocated. |
| // |
| // FIX ME FIX ME Add a destructor, and don't rely on the user to drain/flush/deallocate! |
| // |
| |
| // Move to some global location |
| #define HAS_BEEN_MOVED 0x1501d01d |
| // End move to some global location |
| |
| class MutableSpace; |
| class PSOldGen; |
| class ParCompactionManager; |
| |
| class PSPromotionManager VALUE_OBJ_CLASS_SPEC { |
| friend class PSScavenge; |
| friend class PSRefProcTaskExecutor; |
| private: |
| static PaddedEnd<PSPromotionManager>* _manager_array; |
| static OopStarTaskQueueSet* _stack_array_depth; |
| static PSOldGen* _old_gen; |
| static MutableSpace* _young_space; |
| |
| #if TASKQUEUE_STATS |
| size_t _masked_pushes; |
| size_t _masked_steals; |
| size_t _arrays_chunked; |
| size_t _array_chunks_processed; |
| |
| void print_taskqueue_stats(uint i) const; |
| void print_local_stats(uint i) const; |
| static void print_stats(); |
| |
| void reset_stats(); |
| #endif // TASKQUEUE_STATS |
| |
| PSYoungPromotionLAB _young_lab; |
| PSOldPromotionLAB _old_lab; |
| bool _young_gen_is_full; |
| bool _old_gen_is_full; |
| |
| OopStarTaskQueue _claimed_stack_depth; |
| OverflowTaskQueue<oop, mtGC> _claimed_stack_breadth; |
| |
| bool _totally_drain; |
| uint _target_stack_size; |
| |
| uint _array_chunk_size; |
| uint _min_array_size_for_chunking; |
| |
| PromotionFailedInfo _promotion_failed_info; |
| |
| // Accessors |
| static PSOldGen* old_gen() { return _old_gen; } |
| static MutableSpace* young_space() { return _young_space; } |
| |
| inline static PSPromotionManager* manager_array(int index); |
| template <class T> inline void claim_or_forward_internal_depth(T* p); |
| |
| // On the task queues we push reference locations as well as |
| // partially-scanned arrays (in the latter case, we push an oop to |
| // the from-space image of the array and the length on the |
| // from-space image indicates how many entries on the array we still |
| // need to scan; this is basically how ParNew does partial array |
| // scanning too). To be able to distinguish between reference |
| // locations and partially-scanned array oops we simply mask the |
| // latter oops with 0x01. The next three methods do the masking, |
| // unmasking, and checking whether the oop is masked or not. Notice |
| // that the signature of the mask and unmask methods looks a bit |
| // strange, as they accept and return different types (oop and |
| // oop*). This is because of the difference in types between what |
| // the task queue holds (oop*) and oops to partially-scanned arrays |
| // (oop). We do all the necessary casting in the mask / unmask |
| // methods to avoid sprinkling the rest of the code with more casts. |
| |
| // These are added to the taskqueue so PS_CHUNKED_ARRAY_OOP_MASK (or any |
| // future masks) can't conflict with COMPRESSED_OOP_MASK |
| #define PS_CHUNKED_ARRAY_OOP_MASK 0x2 |
| |
| bool is_oop_masked(StarTask p) { |
| // If something is marked chunked it's always treated like wide oop* |
| return (((intptr_t)(oop*)p) & PS_CHUNKED_ARRAY_OOP_MASK) == |
| PS_CHUNKED_ARRAY_OOP_MASK; |
| } |
| |
| oop* mask_chunked_array_oop(oop obj) { |
| assert(!is_oop_masked((oop*) obj), "invariant"); |
| oop* ret = (oop*) (cast_from_oop<uintptr_t>(obj) | PS_CHUNKED_ARRAY_OOP_MASK); |
| assert(is_oop_masked(ret), "invariant"); |
| return ret; |
| } |
| |
| oop unmask_chunked_array_oop(StarTask p) { |
| assert(is_oop_masked(p), "invariant"); |
| assert(!p.is_narrow(), "chunked array oops cannot be narrow"); |
| oop *chunk = (oop*)p; // cast p to oop (uses conversion operator) |
| oop ret = oop((oop*)((uintptr_t)chunk & ~PS_CHUNKED_ARRAY_OOP_MASK)); |
| assert(!is_oop_masked((oop*) ret), "invariant"); |
| return ret; |
| } |
| |
| template <class T> void process_array_chunk_work(oop obj, |
| int start, int end); |
| void process_array_chunk(oop old); |
| |
| template <class T> void push_depth(T* p) { |
| claimed_stack_depth()->push(p); |
| } |
| |
| protected: |
| static OopStarTaskQueueSet* stack_array_depth() { return _stack_array_depth; } |
| public: |
| // Static |
| static void initialize(); |
| |
| static void pre_scavenge(); |
| static bool post_scavenge(YoungGCTracer& gc_tracer); |
| |
| static PSPromotionManager* gc_thread_promotion_manager(int index); |
| static PSPromotionManager* vm_thread_promotion_manager(); |
| |
| static bool steal_depth(int queue_num, int* seed, StarTask& t) { |
| return stack_array_depth()->steal(queue_num, seed, t); |
| } |
| |
| PSPromotionManager(); |
| |
| // Accessors |
| OopStarTaskQueue* claimed_stack_depth() { |
| return &_claimed_stack_depth; |
| } |
| |
| bool young_gen_is_full() { return _young_gen_is_full; } |
| |
| bool old_gen_is_full() { return _old_gen_is_full; } |
| void set_old_gen_is_full(bool state) { _old_gen_is_full = state; } |
| |
| // Promotion methods |
| template<bool promote_immediately> oop copy_to_survivor_space(oop o); |
| oop oop_promotion_failed(oop obj, markOop obj_mark); |
| |
| void reset(); |
| |
| void flush_labs(); |
| void drain_stacks(bool totally_drain) { |
| drain_stacks_depth(totally_drain); |
| } |
| public: |
| void drain_stacks_cond_depth() { |
| if (claimed_stack_depth()->size() > _target_stack_size) { |
| drain_stacks_depth(false); |
| } |
| } |
| void drain_stacks_depth(bool totally_drain); |
| |
| bool stacks_empty() { |
| return claimed_stack_depth()->is_empty(); |
| } |
| |
| inline void process_popped_location_depth(StarTask p); |
| |
| template <class T> inline void claim_or_forward_depth(T* p); |
| |
| TASKQUEUE_STATS_ONLY(inline void record_steal(StarTask& p);) |
| }; |
| |
| #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_HPP |