src/hotspot/share/gc/g1/g1RemSet.hpp
author tschatzl
Wed, 13 Mar 2019 21:01:56 +0100
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8220301: Remove jbyte use in CardTable Summary: Use CardTable::CardValue aliased to uint8_t instead. Reviewed-by: kbarrett, shade
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/*
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 * Copyright (c) 2001, 2019, 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_GC_G1_G1REMSET_HPP
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#define SHARE_GC_G1_G1REMSET_HPP
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#include "gc/g1/g1CardTable.hpp"
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#include "gc/g1/g1OopClosures.hpp"
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#include "gc/g1/g1GCPhaseTimes.hpp"
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#include "gc/g1/g1RemSetSummary.hpp"
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#include "gc/g1/heapRegion.hpp"
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#include "memory/allocation.hpp"
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#include "memory/iterator.hpp"
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#include "utilities/ticks.hpp"
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// A G1RemSet provides ways of iterating over pointers into a selected
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// collection set.
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class BitMap;
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class CardTableBarrierSet;
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class G1BlockOffsetTable;
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class CodeBlobClosure;
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class G1CollectedHeap;
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class G1CMBitMap;
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class G1HotCardCache;
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class G1RemSetScanState;
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class G1ParScanThreadState;
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class G1Policy;
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class G1ScanObjsDuringScanRSClosure;
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class G1ScanObjsDuringUpdateRSClosure;
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class HeapRegionClaimer;
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// A G1RemSet in which each heap region has a rem set that records the
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// external heap references into it.  Uses a mod ref bs to track updates,
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// so that they can be used to update the individual region remsets.
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class G1RemSet: public CHeapObj<mtGC> {
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private:
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  G1RemSetScanState* _scan_state;
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  G1RemSetSummary _prev_period_summary;
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  // Scan all remembered sets of the collection set for references into the collection
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  // set.
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  void scan_rem_set(G1ParScanThreadState* pss, uint worker_i);
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  // Flush remaining refinement buffers for cross-region references to either evacuate references
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  // into the collection set or update the remembered set.
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  void update_rem_set(G1ParScanThreadState* pss, uint worker_i);
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  G1CollectedHeap* _g1h;
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  size_t _num_conc_refined_cards; // Number of cards refined concurrently to the mutator.
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  G1CardTable*           _ct;
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  G1Policy*              _g1p;
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  G1HotCardCache*        _hot_card_cache;
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public:
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  typedef CardTable::CardValue CardValue;
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  // Gives an approximation on how many threads can be expected to add records to
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  // a remembered set in parallel. This can be used for sizing data structures to
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  // decrease performance losses due to data structure sharing.
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  // Examples for quantities that influence this value are the maximum number of
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  // mutator threads, maximum number of concurrent refinement or GC threads.
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  static uint num_par_rem_sets();
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  // Initialize data that depends on the heap size being known.
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  void initialize(size_t capacity, uint max_regions);
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  G1RemSet(G1CollectedHeap* g1h,
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           G1CardTable* ct,
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           G1HotCardCache* hot_card_cache);
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  ~G1RemSet();
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  // Process all oops in the collection set from the cards in the refinement buffers and
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  // remembered sets using pss.
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  //
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  // Further applies heap_region_codeblobs on the oops of the unmarked nmethods on the strong code
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  // roots list for each region in the collection set.
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  void oops_into_collection_set_do(G1ParScanThreadState* pss, uint worker_i);
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  // Prepare for and cleanup after an oops_into_collection_set_do
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  // call.  Must call each of these once before and after (in sequential
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  // code) any thread calls oops_into_collection_set_do.
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  void prepare_for_oops_into_collection_set_do();
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  void cleanup_after_oops_into_collection_set_do();
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  G1RemSetScanState* scan_state() const { return _scan_state; }
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  // Refine the card corresponding to "card_ptr". Safe to be called concurrently
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  // to the mutator.
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  void refine_card_concurrently(CardValue* card_ptr,
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                                uint worker_i);
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  // Refine the card corresponding to "card_ptr", applying the given closure to
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  // all references found. Must only be called during gc.
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  // Returns whether the card has been scanned.
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  bool refine_card_during_gc(CardValue* card_ptr, G1ScanObjsDuringUpdateRSClosure* update_rs_cl);
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  // Print accumulated summary info from the start of the VM.
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  void print_summary_info();
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  // Print accumulated summary info from the last time called.
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  void print_periodic_summary_info(const char* header, uint period_count);
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  size_t num_conc_refined_cards() const { return _num_conc_refined_cards; }
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  // Rebuilds the remembered set by scanning from bottom to TARS for all regions
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  // using the given work gang.
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  void rebuild_rem_set(G1ConcurrentMark* cm, WorkGang* workers, uint worker_id_offset);
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};
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class G1ScanRSForRegionClosure : public HeapRegionClosure {
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  G1CollectedHeap* _g1h;
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  G1CardTable *_ct;
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  G1ParScanThreadState* _pss;
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  G1ScanObjsDuringScanRSClosure* _scan_objs_on_card_cl;
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  G1RemSetScanState* _scan_state;
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  G1GCPhaseTimes::GCParPhases _phase;
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  uint   _worker_i;
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  size_t _cards_scanned;
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  size_t _cards_claimed;
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  size_t _cards_skipped;
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  Tickspan _rem_set_root_scan_time;
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  Tickspan _rem_set_trim_partially_time;
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  Tickspan _strong_code_root_scan_time;
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  Tickspan _strong_code_trim_partially_time;
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  void claim_card(size_t card_index, const uint region_idx_for_card);
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  void scan_card(MemRegion mr, uint region_idx_for_card);
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  void scan_rem_set_roots(HeapRegion* r);
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  void scan_strong_code_roots(HeapRegion* r);
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public:
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  G1ScanRSForRegionClosure(G1RemSetScanState* scan_state,
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                           G1ScanObjsDuringScanRSClosure* scan_obj_on_card,
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                           G1ParScanThreadState* pss,
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                           G1GCPhaseTimes::GCParPhases phase,
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                           uint worker_i);
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  bool do_heap_region(HeapRegion* r);
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  Tickspan rem_set_root_scan_time() const { return _rem_set_root_scan_time; }
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  Tickspan rem_set_trim_partially_time() const { return _rem_set_trim_partially_time; }
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  Tickspan strong_code_root_scan_time() const { return _strong_code_root_scan_time;  }
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  Tickspan strong_code_root_trim_partially_time() const { return _strong_code_trim_partially_time; }
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  size_t cards_scanned() const { return _cards_scanned; }
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  size_t cards_claimed() const { return _cards_claimed; }
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  size_t cards_skipped() const { return _cards_skipped; }
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};
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#endif // SHARE_GC_G1_G1REMSET_HPP