| /* |
| * Copyright (c) 2001, 2019, 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_GC_G1_G1REMSET_HPP |
| #define SHARE_GC_G1_G1REMSET_HPP |
| |
| #include "gc/g1/g1CardTable.hpp" |
| #include "gc/g1/g1OopClosures.hpp" |
| #include "gc/g1/g1GCPhaseTimes.hpp" |
| #include "gc/g1/g1RemSetSummary.hpp" |
| #include "gc/g1/heapRegion.hpp" |
| #include "memory/allocation.hpp" |
| #include "memory/iterator.hpp" |
| #include "utilities/ticks.hpp" |
| |
| // A G1RemSet provides ways of iterating over pointers into a selected |
| // collection set. |
| |
| class BitMap; |
| class CardTableBarrierSet; |
| class G1BlockOffsetTable; |
| class CodeBlobClosure; |
| class G1CollectedHeap; |
| class G1CMBitMap; |
| class G1HotCardCache; |
| class G1RemSetScanState; |
| class G1ParScanThreadState; |
| class G1ParScanThreadStateSet; |
| class G1Policy; |
| class G1ScanCardClosure; |
| 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; |
| |
| G1RemSetSummary _prev_period_summary; |
| |
| G1CollectedHeap* _g1h; |
| |
| G1CardTable* _ct; |
| G1Policy* _g1p; |
| G1HotCardCache* _hot_card_cache; |
| |
| void print_merge_heap_roots_stats(); |
| public: |
| |
| typedef CardTable::CardValue CardValue; |
| // 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); |
| |
| G1RemSet(G1CollectedHeap* g1h, |
| G1CardTable* ct, |
| G1HotCardCache* hot_card_cache); |
| ~G1RemSet(); |
| |
| // Scan all cards in the non-collection set regions that potentially contain |
| // references into the current whole collection set. |
| void scan_heap_roots(G1ParScanThreadState* pss, |
| uint worker_id, |
| G1GCPhaseTimes::GCParPhases scan_phase, |
| G1GCPhaseTimes::GCParPhases objcopy_phase); |
| |
| // Merge cards from various sources (remembered sets, hot card cache, log buffers) |
| // and calculate the cards that need to be scanned later (via scan_heap_roots()). |
| // If initial_evacuation is set, this is called during the initial evacuation. |
| void merge_heap_roots(bool initial_evacuation); |
| |
| // Prepare for and cleanup after scanning the heap roots. Must be called |
| // once before and after in sequential code. |
| void prepare_for_scan_heap_roots(); |
| // Cleans the card table from temporary duplicate detection information. |
| void cleanup_after_scan_heap_roots(); |
| // Prepares the given region for heap root scanning. |
| void prepare_for_scan_heap_roots(uint region_idx); |
| |
| // Do work for regions in the current increment of the collection set, scanning |
| // non-card based (heap) roots. |
| void scan_collection_set_regions(G1ParScanThreadState* pss, |
| uint worker_id, |
| G1GCPhaseTimes::GCParPhases scan_phase, |
| G1GCPhaseTimes::GCParPhases coderoots_phase, |
| G1GCPhaseTimes::GCParPhases objcopy_phase); |
| |
| // Refine the card corresponding to "card_ptr". Safe to be called concurrently |
| // to the mutator. |
| void refine_card_concurrently(CardValue* card_ptr, |
| uint worker_id); |
| |
| // 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); |
| |
| // Rebuilds the remembered set by scanning from bottom to TARS for all regions |
| // using the given work gang. |
| void rebuild_rem_set(G1ConcurrentMark* cm, WorkGang* workers, uint worker_id_offset); |
| }; |
| |
| #endif // SHARE_GC_G1_G1REMSET_HPP |