Quellcode-Bibliothek

^© Kompilation durch diese Firma

[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]

Datei: instanceOop.cpp Sprache: C

/*
* Copyright (c) 2001, 2022, 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 CodeBlobClosure;
class G1AbstractSubTask;
class G1CollectedHeap;
class G1CMBitMap;
class G1HotCardCache;
class G1RemSetScanState;
class G1ParScanThreadState;
class G1ParScanThreadStateSet;
class G1Policy;
class G1RemSetSamplingTask;
class G1ScanCardClosure;
class G1ServiceThread;
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> {
public:
  typedef CardTable::CardValue CardValue;

private:
  G1RemSetScanState* _scan_state;

  G1RemSetSummary _prev_period_summary;

  G1CollectedHeap* _g1h;

  G1CardTable*           _ct;
  G1Policy*              _g1p;
  G1HotCardCache*        _hot_card_cache;

  void print_merge_heap_roots_stats();

  void assert_scan_top_is_null(uint hrm_index) NOT_DEBUG_RETURN;

  void enqueue_for_reprocessing(CardValue* card_ptr);

public:
  // Initialize data that depends on the heap size being known.
  void initialize(uint max_reserved_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,
                       bool remember_already_scanned_cards);

  // 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);

  void complete_evac_phase(bool has_more_than_one_evacuation_phase);
  // 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();

  // Print coarsening stats.
  void print_coarsen_stats();
  // Creates a task for cleaining up temporary data structures and the
  // card table, removing temporary duplicate detection information.
  G1AbstractSubTask* create_cleanup_after_scan_heap_roots_task();
  // Excludes the given region from heap root scanning.
  void exclude_region_from_scan(uint region_idx);
  // Creates a snapshot of the current _top values at the start of collection to
  // filter out card marks that we do not want to scan.
  void prepare_region_for_scan(HeapRegion* region);

  // 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);

  // Two methods for concurrent refinement support, executed concurrently to
  // the mutator:
  // Cleans the card at "*card_ptr_addr" before refinement, returns true iff the
  // card needs later refinement. Note that "*card_ptr_addr" could be updated to
  // a different card due to use of hot card cache.
  bool clean_card_before_refine(CardValue** const card_ptr_addr);
  // Refine the region corresponding to "card_ptr". Must be called after
  // being filtered by clean_card_before_refine(), and after proper
  // fence/synchronization.
  void refine_card_concurrently(CardValue* const card_ptr,
                                const 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, bool show_thread_times);
};

#endif // SHARE_GC_G1_G1REMSET_HPP

¤ Dauer der Verarbeitung: 0.27 Sekunden (vorverarbeitet) ¤

Download des Quellennavigators
Download des sprechenden Kalenders
in der Quellcodebibliothek suchen

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.