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/* |
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* Copyright (c) 2002, 2015, 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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#ifndef SHARE_VM_GC_PARALLEL_PSPROMOTIONMANAGER_HPP |
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#define SHARE_VM_GC_PARALLEL_PSPROMOTIONMANAGER_HPP |
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#include "gc/parallel/psPromotionLAB.hpp" |
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#include "gc/shared/copyFailedInfo.hpp" |
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#include "gc/shared/gcTrace.hpp" |
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#include "gc/shared/preservedMarks.hpp" |
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#include "gc/shared/taskqueue.hpp" |
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#include "memory/allocation.hpp" |
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#include "memory/padded.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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// |
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// psPromotionManager is used by a single thread to manage object survival |
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// during a scavenge. The promotion manager contains thread local data only. |
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// |
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// NOTE! Be careful when allocating the stacks on cheap. If you are going |
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// to use a promotion manager in more than one thread, the stacks MUST be |
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// on cheap. This can lead to memory leaks, though, as they are not auto |
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// deallocated. |
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// |
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// FIX ME FIX ME Add a destructor, and don't rely on the user to drain/flush/deallocate! |
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// |
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class MutableSpace; |
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class PSOldGen; |
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class ParCompactionManager; |
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class PSPromotionManager VALUE_OBJ_CLASS_SPEC { |
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friend class PSScavenge; |
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friend class PSRefProcTaskExecutor; |
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private: |
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static PaddedEnd<PSPromotionManager>* _manager_array; |
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static OopStarTaskQueueSet* _stack_array_depth; |
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static PreservedMarksSet* _preserved_marks_set; |
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static PSOldGen* _old_gen; |
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static MutableSpace* _young_space; |
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#if TASKQUEUE_STATS |
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size_t _masked_pushes; |
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size_t _masked_steals; |
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size_t _arrays_chunked; |
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size_t _array_chunks_processed; |
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void print_local_stats(outputStream* const out, uint i) const; |
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static void print_taskqueue_stats(); |
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void reset_stats(); |
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#endif // TASKQUEUE_STATS |
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PSYoungPromotionLAB _young_lab; |
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PSOldPromotionLAB _old_lab; |
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bool _young_gen_is_full; |
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bool _old_gen_is_full; |
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OopStarTaskQueue _claimed_stack_depth; |
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OverflowTaskQueue<oop, mtGC> _claimed_stack_breadth; |
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bool _totally_drain; |
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uint _target_stack_size; |
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uint _array_chunk_size; |
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uint _min_array_size_for_chunking; |
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PreservedMarks* _preserved_marks; |
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PromotionFailedInfo _promotion_failed_info; |
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// Accessors |
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static PSOldGen* old_gen() { return _old_gen; } |
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static MutableSpace* young_space() { return _young_space; } |
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inline static PSPromotionManager* manager_array(uint index); |
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template <class T> inline void claim_or_forward_internal_depth(T* p); |
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// On the task queues we push reference locations as well as |
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// partially-scanned arrays (in the latter case, we push an oop to |
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// the from-space image of the array and the length on the |
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// from-space image indicates how many entries on the array we still |
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// need to scan; this is basically how ParNew does partial array |
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// scanning too). To be able to distinguish between reference |
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// locations and partially-scanned array oops we simply mask the |
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// latter oops with 0x01. The next three methods do the masking, |
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// unmasking, and checking whether the oop is masked or not. Notice |
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// that the signature of the mask and unmask methods looks a bit |
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// strange, as they accept and return different types (oop and |
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// oop*). This is because of the difference in types between what |
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// the task queue holds (oop*) and oops to partially-scanned arrays |
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// (oop). We do all the necessary casting in the mask / unmask |
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// methods to avoid sprinkling the rest of the code with more casts. |
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// These are added to the taskqueue so PS_CHUNKED_ARRAY_OOP_MASK (or any |
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// future masks) can't conflict with COMPRESSED_OOP_MASK |
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#define PS_CHUNKED_ARRAY_OOP_MASK 0x2 |
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bool is_oop_masked(StarTask p) { |
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// If something is marked chunked it's always treated like wide oop* |
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return (((intptr_t)(oop*)p) & PS_CHUNKED_ARRAY_OOP_MASK) == |
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PS_CHUNKED_ARRAY_OOP_MASK; |
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} |
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oop* mask_chunked_array_oop(oop obj) { |
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assert(!is_oop_masked((oop*) obj), "invariant"); |
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oop* ret = (oop*) (cast_from_oop<uintptr_t>(obj) | PS_CHUNKED_ARRAY_OOP_MASK); |
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assert(is_oop_masked(ret), "invariant"); |
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return ret; |
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} |
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oop unmask_chunked_array_oop(StarTask p) { |
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assert(is_oop_masked(p), "invariant"); |
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assert(!p.is_narrow(), "chunked array oops cannot be narrow"); |
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oop *chunk = (oop*)p; // cast p to oop (uses conversion operator) |
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oop ret = oop((oop*)((uintptr_t)chunk & ~PS_CHUNKED_ARRAY_OOP_MASK)); |
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assert(!is_oop_masked((oop*) ret), "invariant"); |
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return ret; |
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} |
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template <class T> void process_array_chunk_work(oop obj, |
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int start, int end); |
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void process_array_chunk(oop old); |
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template <class T> void push_depth(T* p); |
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inline void promotion_trace_event(oop new_obj, oop old_obj, size_t obj_size, |
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uint age, bool tenured, |
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const PSPromotionLAB* lab); |
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protected: |
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static OopStarTaskQueueSet* stack_array_depth() { return _stack_array_depth; } |
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public: |
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// Static |
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static void initialize(); |
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static void pre_scavenge(); |
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static bool post_scavenge(YoungGCTracer& gc_tracer); |
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static PSPromotionManager* gc_thread_promotion_manager(uint index); |
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static PSPromotionManager* vm_thread_promotion_manager(); |
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static bool steal_depth(int queue_num, int* seed, StarTask& t); |
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PSPromotionManager(); |
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// Accessors |
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OopStarTaskQueue* claimed_stack_depth() { |
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return &_claimed_stack_depth; |
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} |
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bool young_gen_is_full() { return _young_gen_is_full; } |
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bool old_gen_is_full() { return _old_gen_is_full; } |
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void set_old_gen_is_full(bool state) { _old_gen_is_full = state; } |
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// Promotion methods |
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template<bool promote_immediately> oop copy_to_survivor_space(oop o); |
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oop oop_promotion_failed(oop obj, markOop obj_mark); |
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void reset(); |
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void register_preserved_marks(PreservedMarks* preserved_marks); |
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static void restore_preserved_marks() { _preserved_marks_set->restore(); } |
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void flush_labs(); |
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void drain_stacks(bool totally_drain) { |
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drain_stacks_depth(totally_drain); |
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} |
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public: |
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void drain_stacks_cond_depth() { |
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if (claimed_stack_depth()->size() > _target_stack_size) { |
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drain_stacks_depth(false); |
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} |
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} |
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void drain_stacks_depth(bool totally_drain); |
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bool stacks_empty() { |
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return claimed_stack_depth()->is_empty(); |
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} |
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inline void process_popped_location_depth(StarTask p); |
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static bool should_scavenge(oop* p, bool check_to_space = false); |
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static bool should_scavenge(narrowOop* p, bool check_to_space = false); |
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template <class T, bool promote_immediately> |
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void copy_and_push_safe_barrier(T* p); |
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template <class T> inline void claim_or_forward_depth(T* p); |
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TASKQUEUE_STATS_ONLY(inline void record_steal(StarTask& p);) |
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void push_contents(oop obj); |
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}; |
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#endif // SHARE_VM_GC_PARALLEL_PSPROMOTIONMANAGER_HPP |