| /* |
| * Copyright (c) 2014, 2017, 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_G1_G1PARSCANTHREADSTATE_HPP |
| #define SHARE_VM_GC_G1_G1PARSCANTHREADSTATE_HPP |
| |
| #include "gc/g1/dirtyCardQueue.hpp" |
| #include "gc/g1/g1CollectedHeap.hpp" |
| #include "gc/g1/g1OopClosures.hpp" |
| #include "gc/g1/g1Policy.hpp" |
| #include "gc/g1/g1RemSet.hpp" |
| #include "gc/g1/g1SATBCardTableModRefBS.hpp" |
| #include "gc/shared/ageTable.hpp" |
| #include "memory/allocation.hpp" |
| #include "oops/oop.hpp" |
| |
| class G1PLABAllocator; |
| class G1EvacuationRootClosures; |
| class HeapRegion; |
| class outputStream; |
| |
| class G1ParScanThreadState : public CHeapObj<mtGC> { |
| private: |
| G1CollectedHeap* _g1h; |
| RefToScanQueue* _refs; |
| DirtyCardQueue _dcq; |
| G1SATBCardTableModRefBS* _ct_bs; |
| G1EvacuationRootClosures* _closures; |
| |
| G1PLABAllocator* _plab_allocator; |
| |
| AgeTable _age_table; |
| InCSetState _dest[InCSetState::Num]; |
| // Local tenuring threshold. |
| uint _tenuring_threshold; |
| G1ScanEvacuatedObjClosure _scanner; |
| |
| int _hash_seed; |
| uint _worker_id; |
| |
| // Map from young-age-index (0 == not young, 1 is youngest) to |
| // surviving words. base is what we get back from the malloc call |
| size_t* _surviving_young_words_base; |
| // this points into the array, as we use the first few entries for padding |
| size_t* _surviving_young_words; |
| |
| // Indicates whether in the last generation (old) there is no more space |
| // available for allocation. |
| bool _old_gen_is_full; |
| |
| #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
| |
| DirtyCardQueue& dirty_card_queue() { return _dcq; } |
| G1SATBCardTableModRefBS* ctbs() { return _ct_bs; } |
| |
| InCSetState dest(InCSetState original) const { |
| assert(original.is_valid(), |
| "Original state invalid: " CSETSTATE_FORMAT, original.value()); |
| assert(_dest[original.value()].is_valid_gen(), |
| "Dest state is invalid: " CSETSTATE_FORMAT, _dest[original.value()].value()); |
| return _dest[original.value()]; |
| } |
| |
| public: |
| G1ParScanThreadState(G1CollectedHeap* g1h, uint worker_id, size_t young_cset_length); |
| virtual ~G1ParScanThreadState(); |
| |
| void set_ref_processor(ReferenceProcessor* rp) { _scanner.set_ref_processor(rp); } |
| |
| #ifdef ASSERT |
| bool queue_is_empty() const { return _refs->is_empty(); } |
| |
| bool verify_ref(narrowOop* ref) const; |
| bool verify_ref(oop* ref) const; |
| bool verify_task(StarTask ref) const; |
| #endif // ASSERT |
| |
| template <class T> void do_oop_ext(T* ref); |
| template <class T> void push_on_queue(T* ref); |
| |
| template <class T> void update_rs(HeapRegion* from, T* p, oop o) { |
| assert(!HeapRegion::is_in_same_region(p, o), "Caller should have filtered out cross-region references already."); |
| // If the field originates from the to-space, we don't need to include it |
| // in the remembered set updates. |
| if (!from->is_young()) { |
| size_t card_index = ctbs()->index_for(p); |
| // If the card hasn't been added to the buffer, do it. |
| if (ctbs()->mark_card_deferred(card_index)) { |
| dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
| } |
| } |
| } |
| |
| G1EvacuationRootClosures* closures() { return _closures; } |
| uint worker_id() { return _worker_id; } |
| |
| // Returns the current amount of waste due to alignment or not being able to fit |
| // objects within LABs and the undo waste. |
| virtual void waste(size_t& wasted, size_t& undo_wasted); |
| |
| size_t* surviving_young_words() { |
| // We add one to hide entry 0 which accumulates surviving words for |
| // age -1 regions (i.e. non-young ones) |
| return _surviving_young_words + 1; |
| } |
| |
| void flush(size_t* surviving_young_words); |
| |
| private: |
| #define G1_PARTIAL_ARRAY_MASK 0x2 |
| |
| inline bool has_partial_array_mask(oop* ref) const { |
| return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK; |
| } |
| |
| // We never encode partial array oops as narrowOop*, so return false immediately. |
| // This allows the compiler to create optimized code when popping references from |
| // the work queue. |
| inline bool has_partial_array_mask(narrowOop* ref) const { |
| assert(((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) != G1_PARTIAL_ARRAY_MASK, "Partial array oop reference encoded as narrowOop*"); |
| return false; |
| } |
| |
| // Only implement set_partial_array_mask() for regular oops, not for narrowOops. |
| // We always encode partial arrays as regular oop, to allow the |
| // specialization for has_partial_array_mask() for narrowOops above. |
| // This means that unintentional use of this method with narrowOops are caught |
| // by the compiler. |
| inline oop* set_partial_array_mask(oop obj) const { |
| assert(((uintptr_t)(void *)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!"); |
| return (oop*) ((uintptr_t)(void *)obj | G1_PARTIAL_ARRAY_MASK); |
| } |
| |
| inline oop clear_partial_array_mask(oop* ref) const { |
| return cast_to_oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK); |
| } |
| |
| inline void do_oop_partial_array(oop* p); |
| |
| // This method is applied to the fields of the objects that have just been copied. |
| template <class T> inline void do_oop_evac(T* p, HeapRegion* from); |
| |
| template <class T> inline void deal_with_reference(T* ref_to_scan); |
| |
| inline void dispatch_reference(StarTask ref); |
| |
| // Tries to allocate word_sz in the PLAB of the next "generation" after trying to |
| // allocate into dest. State is the original (source) cset state for the object |
| // that is allocated for. Previous_plab_refill_failed indicates whether previously |
| // a PLAB refill into "state" failed. |
| // Returns a non-NULL pointer if successful, and updates dest if required. |
| // Also determines whether we should continue to try to allocate into the various |
| // generations or just end trying to allocate. |
| HeapWord* allocate_in_next_plab(InCSetState const state, |
| InCSetState* dest, |
| size_t word_sz, |
| AllocationContext_t const context, |
| bool previous_plab_refill_failed); |
| |
| inline InCSetState next_state(InCSetState const state, markOop const m, uint& age); |
| |
| void report_promotion_event(InCSetState const dest_state, |
| oop const old, size_t word_sz, uint age, |
| HeapWord * const obj_ptr, const AllocationContext_t context) const; |
| public: |
| |
| oop copy_to_survivor_space(InCSetState const state, oop const obj, markOop const old_mark); |
| |
| void trim_queue(); |
| |
| inline void steal_and_trim_queue(RefToScanQueueSet *task_queues); |
| |
| // An attempt to evacuate "obj" has failed; take necessary steps. |
| oop handle_evacuation_failure_par(oop obj, markOop m); |
| }; |
| |
| class G1ParScanThreadStateSet : public StackObj { |
| G1CollectedHeap* _g1h; |
| G1ParScanThreadState** _states; |
| size_t* _surviving_young_words_total; |
| size_t _young_cset_length; |
| uint _n_workers; |
| bool _flushed; |
| |
| public: |
| G1ParScanThreadStateSet(G1CollectedHeap* g1h, uint n_workers, size_t young_cset_length) : |
| _g1h(g1h), |
| _states(NEW_C_HEAP_ARRAY(G1ParScanThreadState*, n_workers, mtGC)), |
| _surviving_young_words_total(NEW_C_HEAP_ARRAY(size_t, young_cset_length, mtGC)), |
| _young_cset_length(young_cset_length), |
| _n_workers(n_workers), |
| _flushed(false) { |
| for (uint i = 0; i < n_workers; ++i) { |
| _states[i] = NULL; |
| } |
| memset(_surviving_young_words_total, 0, young_cset_length * sizeof(size_t)); |
| } |
| |
| ~G1ParScanThreadStateSet() { |
| assert(_flushed, "thread local state from the per thread states should have been flushed"); |
| FREE_C_HEAP_ARRAY(G1ParScanThreadState*, _states); |
| FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_total); |
| } |
| |
| void flush(); |
| |
| G1ParScanThreadState* state_for_worker(uint worker_id); |
| |
| const size_t* surviving_young_words() const; |
| |
| private: |
| G1ParScanThreadState* new_par_scan_state(uint worker_id, size_t young_cset_length); |
| }; |
| |
| #endif // SHARE_VM_GC_G1_G1PARSCANTHREADSTATE_HPP |