| /* |
| * Copyright (c) 2001, 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_G1REMSET_HPP |
| #define SHARE_VM_GC_G1_G1REMSET_HPP |
| |
| #include "gc/g1/dirtyCardQueue.hpp" |
| #include "gc/g1/g1CardLiveData.hpp" |
| #include "gc/g1/g1RemSetSummary.hpp" |
| #include "gc/g1/heapRegion.hpp" |
| #include "memory/allocation.hpp" |
| #include "memory/iterator.hpp" |
| |
| // A G1RemSet provides ways of iterating over pointers into a selected |
| // collection set. |
| |
| class BitMap; |
| class CardTableModRefBS; |
| class G1BlockOffsetTable; |
| class CodeBlobClosure; |
| class G1CollectedHeap; |
| class G1HotCardCache; |
| class G1RemSetScanState; |
| class G1ParScanThreadState; |
| class G1Policy; |
| class G1SATBCardTableModRefBS; |
| class G1ScanObjsDuringScanRSClosure; |
| class G1ScanObjsDuringUpdateRSClosure; |
| class HeapRegionClaimer; |
| |
| // A G1RemSet in which each heap region has a rem set that records the |
| // external heap references into it. Uses a mod ref bs to track updates, |
| // so that they can be used to update the individual region remsets. |
| class G1RemSet: public CHeapObj<mtGC> { |
| private: |
| G1RemSetScanState* _scan_state; |
| G1CardLiveData _card_live_data; |
| |
| G1RemSetSummary _prev_period_summary; |
| |
| // Scan all remembered sets of the collection set for references into the collection |
| // set. |
| void scan_rem_set(G1ParScanThreadState* pss, |
| CodeBlobClosure* heap_region_codeblobs, |
| uint worker_i); |
| |
| // Flush remaining refinement buffers for cross-region references to either evacuate references |
| // into the collection set or update the remembered set. |
| void update_rem_set(G1ParScanThreadState* pss, uint worker_i); |
| |
| G1CollectedHeap* _g1; |
| size_t _num_conc_refined_cards; // Number of cards refined concurrently to the mutator. |
| |
| CardTableModRefBS* _ct_bs; |
| G1Policy* _g1p; |
| G1HotCardCache* _hot_card_cache; |
| |
| public: |
| // Gives an approximation on how many threads can be expected to add records to |
| // a remembered set in parallel. This can be used for sizing data structures to |
| // decrease performance losses due to data structure sharing. |
| // Examples for quantities that influence this value are the maximum number of |
| // mutator threads, maximum number of concurrent refinement or GC threads. |
| static uint num_par_rem_sets(); |
| |
| // Initialize data that depends on the heap size being known. |
| void initialize(size_t capacity, uint max_regions); |
| |
| // This is called to reset dual hash tables after the gc pause |
| // is finished and the initial hash table is no longer being |
| // scanned. |
| void cleanupHRRS(); |
| |
| G1RemSet(G1CollectedHeap* g1, |
| CardTableModRefBS* ct_bs, |
| G1HotCardCache* hot_card_cache); |
| ~G1RemSet(); |
| |
| // Process all oops in the collection set from the cards in the refinement buffers and |
| // remembered sets using pss. |
| // |
| // Further applies heap_region_codeblobs on the oops of the unmarked nmethods on the strong code |
| // roots list for each region in the collection set. |
| void oops_into_collection_set_do(G1ParScanThreadState* pss, |
| CodeBlobClosure* heap_region_codeblobs, |
| uint worker_i); |
| |
| // Prepare for and cleanup after an oops_into_collection_set_do |
| // call. Must call each of these once before and after (in sequential |
| // code) any thread calls oops_into_collection_set_do. |
| void prepare_for_oops_into_collection_set_do(); |
| void cleanup_after_oops_into_collection_set_do(); |
| |
| G1RemSetScanState* scan_state() const { return _scan_state; } |
| |
| // Record, if necessary, the fact that *p (where "p" is in region "from", |
| // which is required to be non-NULL) has changed to a new non-NULL value. |
| template <class T> void par_write_ref(HeapRegion* from, T* p, uint tid); |
| |
| // Eliminates any remembered set entries that correspond to dead heap ranges. |
| void scrub(uint worker_num, HeapRegionClaimer* hrclaimer); |
| |
| // Refine the card corresponding to "card_ptr". Safe to be called concurrently |
| // to the mutator. |
| void refine_card_concurrently(jbyte* card_ptr, |
| uint worker_i); |
| |
| // Refine the card corresponding to "card_ptr", applying the given closure to |
| // all references found. Must only be called during gc. |
| // Returns whether the card has been scanned. |
| bool refine_card_during_gc(jbyte* card_ptr, G1ScanObjsDuringUpdateRSClosure* update_rs_cl); |
| |
| // Print accumulated summary info from the start of the VM. |
| void print_summary_info(); |
| |
| // Print accumulated summary info from the last time called. |
| void print_periodic_summary_info(const char* header, uint period_count); |
| |
| size_t num_conc_refined_cards() const { return _num_conc_refined_cards; } |
| |
| void create_card_live_data(WorkGang* workers, G1CMBitMap* mark_bitmap); |
| void finalize_card_live_data(WorkGang* workers, G1CMBitMap* mark_bitmap); |
| |
| // Verify that the liveness count data created concurrently matches one created |
| // during this safepoint. |
| void verify_card_live_data(WorkGang* workers, G1CMBitMap* actual_bitmap); |
| |
| void clear_card_live_data(WorkGang* workers); |
| |
| #ifdef ASSERT |
| void verify_card_live_data_is_clear(); |
| #endif |
| }; |
| |
| class G1ScanRSForRegionClosure : public HeapRegionClosure { |
| G1RemSetScanState* _scan_state; |
| |
| size_t _cards_scanned; |
| size_t _cards_claimed; |
| size_t _cards_skipped; |
| |
| G1CollectedHeap* _g1h; |
| |
| G1ScanObjsDuringScanRSClosure* _scan_objs_on_card_cl; |
| CodeBlobClosure* _code_root_cl; |
| |
| G1BlockOffsetTable* _bot; |
| G1SATBCardTableModRefBS *_ct_bs; |
| |
| double _strong_code_root_scan_time_sec; |
| uint _worker_i; |
| |
| void claim_card(size_t card_index, const uint region_idx_for_card); |
| void scan_card(MemRegion mr, uint region_idx_for_card); |
| void scan_strong_code_roots(HeapRegion* r); |
| public: |
| G1ScanRSForRegionClosure(G1RemSetScanState* scan_state, |
| G1ScanObjsDuringScanRSClosure* scan_obj_on_card, |
| CodeBlobClosure* code_root_cl, |
| uint worker_i); |
| |
| bool doHeapRegion(HeapRegion* r); |
| |
| double strong_code_root_scan_time_sec() { |
| return _strong_code_root_scan_time_sec; |
| } |
| |
| size_t cards_scanned() const { return _cards_scanned; } |
| size_t cards_claimed() const { return _cards_claimed; } |
| size_t cards_skipped() const { return _cards_skipped; } |
| }; |
| |
| class RebuildRSOopClosure: public ExtendedOopClosure { |
| HeapRegion* _from; |
| G1RemSet* _rs; |
| uint _worker_i; |
| |
| template <class T> void do_oop_work(T* p); |
| |
| public: |
| RebuildRSOopClosure(G1RemSet* rs, uint worker_i = 0) : |
| _from(NULL), _rs(rs), _worker_i(worker_i) |
| {} |
| |
| void set_from(HeapRegion* from) { |
| assert(from != NULL, "from region must be non-NULL"); |
| _from = from; |
| } |
| |
| virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
| virtual void do_oop(oop* p) { do_oop_work(p); } |
| }; |
| |
| #endif // SHARE_VM_GC_G1_G1REMSET_HPP |