src/hotspot/share/gc/g1/g1RemSet.cpp
author tschatzl
Wed, 18 Apr 2018 11:36:48 +0200
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parent 49803 14518ac8df87
child 49911 358be4680d12
permissions -rw-r--r--
8200426: Make G1 code use _g1h members Summary: Consistently use _g1h member names for cached G1CollectedHeap* variables. Reviewed-by: sangheki, sjohanss
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/*
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 * Copyright (c) 2001, 2018, 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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#include "precompiled.hpp"
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#include "gc/g1/dirtyCardQueue.hpp"
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#include "gc/g1/g1BarrierSet.hpp"
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#include "gc/g1/g1BlockOffsetTable.inline.hpp"
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#include "gc/g1/g1CardTable.inline.hpp"
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#include "gc/g1/g1CollectedHeap.inline.hpp"
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#include "gc/g1/g1ConcurrentRefine.hpp"
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#include "gc/g1/g1FromCardCache.hpp"
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#include "gc/g1/g1GCPhaseTimes.hpp"
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#include "gc/g1/g1HotCardCache.hpp"
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#include "gc/g1/g1OopClosures.inline.hpp"
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#include "gc/g1/g1RemSet.hpp"
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#include "gc/g1/heapRegion.inline.hpp"
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#include "gc/g1/heapRegionManager.inline.hpp"
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#include "gc/g1/heapRegionRemSet.hpp"
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#include "gc/shared/gcTraceTime.inline.hpp"
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#include "gc/shared/suspendibleThreadSet.hpp"
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#include "memory/iterator.hpp"
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#include "memory/resourceArea.hpp"
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#include "oops/access.inline.hpp"
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#include "oops/oop.inline.hpp"
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#include "utilities/align.hpp"
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#include "utilities/globalDefinitions.hpp"
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#include "utilities/intHisto.hpp"
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#include "utilities/stack.inline.hpp"
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#include "utilities/ticks.inline.hpp"
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// Collects information about the overall remembered set scan progress during an evacuation.
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class G1RemSetScanState : public CHeapObj<mtGC> {
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private:
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  class G1ClearCardTableTask : public AbstractGangTask {
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    G1CollectedHeap* _g1h;
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    uint* _dirty_region_list;
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    size_t _num_dirty_regions;
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    size_t _chunk_length;
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    size_t volatile _cur_dirty_regions;
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  public:
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    G1ClearCardTableTask(G1CollectedHeap* g1h,
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                         uint* dirty_region_list,
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                         size_t num_dirty_regions,
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                         size_t chunk_length) :
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      AbstractGangTask("G1 Clear Card Table Task"),
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      _g1h(g1h),
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      _dirty_region_list(dirty_region_list),
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      _num_dirty_regions(num_dirty_regions),
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      _chunk_length(chunk_length),
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      _cur_dirty_regions(0) {
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      assert(chunk_length > 0, "must be");
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    }
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    static size_t chunk_size() { return M; }
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    void work(uint worker_id) {
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      while (_cur_dirty_regions < _num_dirty_regions) {
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        size_t next = Atomic::add(_chunk_length, &_cur_dirty_regions) - _chunk_length;
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        size_t max = MIN2(next + _chunk_length, _num_dirty_regions);
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        for (size_t i = next; i < max; i++) {
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          HeapRegion* r = _g1h->region_at(_dirty_region_list[i]);
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          if (!r->is_survivor()) {
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            r->clear_cardtable();
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          }
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        }
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      }
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    }
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  };
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  size_t _max_regions;
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  // Scan progress for the remembered set of a single region. Transitions from
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  // Unclaimed -> Claimed -> Complete.
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  // At each of the transitions the thread that does the transition needs to perform
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  // some special action once. This is the reason for the extra "Claimed" state.
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  typedef jint G1RemsetIterState;
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  static const G1RemsetIterState Unclaimed = 0; // The remembered set has not been scanned yet.
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  static const G1RemsetIterState Claimed = 1;   // The remembered set is currently being scanned.
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  static const G1RemsetIterState Complete = 2;  // The remembered set has been completely scanned.
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  G1RemsetIterState volatile* _iter_states;
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  // The current location where the next thread should continue scanning in a region's
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  // remembered set.
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  size_t volatile* _iter_claims;
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  // Temporary buffer holding the regions we used to store remembered set scan duplicate
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  // information. These are also called "dirty". Valid entries are from [0.._cur_dirty_region)
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  uint* _dirty_region_buffer;
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  typedef jbyte IsDirtyRegionState;
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  static const IsDirtyRegionState Clean = 0;
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  static const IsDirtyRegionState Dirty = 1;
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  // Holds a flag for every region whether it is in the _dirty_region_buffer already
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  // to avoid duplicates. Uses jbyte since there are no atomic instructions for bools.
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  IsDirtyRegionState* _in_dirty_region_buffer;
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  size_t _cur_dirty_region;
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  // Creates a snapshot of the current _top values at the start of collection to
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  // filter out card marks that we do not want to scan.
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  class G1ResetScanTopClosure : public HeapRegionClosure {
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  private:
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    HeapWord** _scan_top;
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  public:
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    G1ResetScanTopClosure(HeapWord** scan_top) : _scan_top(scan_top) { }
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    virtual bool do_heap_region(HeapRegion* r) {
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      uint hrm_index = r->hrm_index();
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      if (!r->in_collection_set() && r->is_old_or_humongous()) {
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        _scan_top[hrm_index] = r->top();
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      } else {
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        _scan_top[hrm_index] = r->bottom();
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      }
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      return false;
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    }
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  };
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  // For each region, contains the maximum top() value to be used during this garbage
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  // collection. Subsumes common checks like filtering out everything but old and
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  // humongous regions outside the collection set.
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  // This is valid because we are not interested in scanning stray remembered set
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  // entries from free or archive regions.
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  HeapWord** _scan_top;
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public:
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  G1RemSetScanState() :
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    _max_regions(0),
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    _iter_states(NULL),
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    _iter_claims(NULL),
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    _dirty_region_buffer(NULL),
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    _in_dirty_region_buffer(NULL),
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    _cur_dirty_region(0),
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    _scan_top(NULL) {
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  }
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  ~G1RemSetScanState() {
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    if (_iter_states != NULL) {
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      FREE_C_HEAP_ARRAY(G1RemsetIterState, _iter_states);
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    }
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    if (_iter_claims != NULL) {
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      FREE_C_HEAP_ARRAY(size_t, _iter_claims);
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    }
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    if (_dirty_region_buffer != NULL) {
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      FREE_C_HEAP_ARRAY(uint, _dirty_region_buffer);
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    }
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    if (_in_dirty_region_buffer != NULL) {
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      FREE_C_HEAP_ARRAY(IsDirtyRegionState, _in_dirty_region_buffer);
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    }
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    if (_scan_top != NULL) {
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      FREE_C_HEAP_ARRAY(HeapWord*, _scan_top);
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    }
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  }
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  void initialize(uint max_regions) {
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    assert(_iter_states == NULL, "Must not be initialized twice");
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    assert(_iter_claims == NULL, "Must not be initialized twice");
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    _max_regions = max_regions;
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    _iter_states = NEW_C_HEAP_ARRAY(G1RemsetIterState, max_regions, mtGC);
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    _iter_claims = NEW_C_HEAP_ARRAY(size_t, max_regions, mtGC);
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    _dirty_region_buffer = NEW_C_HEAP_ARRAY(uint, max_regions, mtGC);
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    _in_dirty_region_buffer = NEW_C_HEAP_ARRAY(IsDirtyRegionState, max_regions, mtGC);
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    _scan_top = NEW_C_HEAP_ARRAY(HeapWord*, max_regions, mtGC);
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  }
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  void reset() {
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    for (uint i = 0; i < _max_regions; i++) {
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      _iter_states[i] = Unclaimed;
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    }
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    G1ResetScanTopClosure cl(_scan_top);
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    G1CollectedHeap::heap()->heap_region_iterate(&cl);
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    memset((void*)_iter_claims, 0, _max_regions * sizeof(size_t));
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    memset(_in_dirty_region_buffer, Clean, _max_regions * sizeof(IsDirtyRegionState));
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    _cur_dirty_region = 0;
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  }
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  // Attempt to claim the remembered set of the region for iteration. Returns true
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  // if this call caused the transition from Unclaimed to Claimed.
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  inline bool claim_iter(uint region) {
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    assert(region < _max_regions, "Tried to access invalid region %u", region);
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    if (_iter_states[region] != Unclaimed) {
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      return false;
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    }
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    G1RemsetIterState res = Atomic::cmpxchg(Claimed, &_iter_states[region], Unclaimed);
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    return (res == Unclaimed);
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  }
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  // Try to atomically sets the iteration state to "complete". Returns true for the
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  // thread that caused the transition.
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  inline bool set_iter_complete(uint region) {
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    if (iter_is_complete(region)) {
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      return false;
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    }
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    G1RemsetIterState res = Atomic::cmpxchg(Complete, &_iter_states[region], Claimed);
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    return (res == Claimed);
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  }
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  // Returns true if the region's iteration is complete.
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  inline bool iter_is_complete(uint region) const {
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    assert(region < _max_regions, "Tried to access invalid region %u", region);
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    return _iter_states[region] == Complete;
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  }
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  // The current position within the remembered set of the given region.
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  inline size_t iter_claimed(uint region) const {
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    assert(region < _max_regions, "Tried to access invalid region %u", region);
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    return _iter_claims[region];
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  }
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  // Claim the next block of cards within the remembered set of the region with
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  // step size.
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  inline size_t iter_claimed_next(uint region, size_t step) {
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    return Atomic::add(step, &_iter_claims[region]) - step;
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  }
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  void add_dirty_region(uint region) {
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    if (_in_dirty_region_buffer[region] == Dirty) {
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      return;
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    }
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    bool marked_as_dirty = Atomic::cmpxchg(Dirty, &_in_dirty_region_buffer[region], Clean) == Clean;
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    if (marked_as_dirty) {
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      size_t allocated = Atomic::add(1u, &_cur_dirty_region) - 1;
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      _dirty_region_buffer[allocated] = region;
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    }
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  }
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  HeapWord* scan_top(uint region_idx) const {
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    return _scan_top[region_idx];
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  }
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  // Clear the card table of "dirty" regions.
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  void clear_card_table(WorkGang* workers) {
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    if (_cur_dirty_region == 0) {
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      return;
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    }
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    size_t const num_chunks = align_up(_cur_dirty_region * HeapRegion::CardsPerRegion, G1ClearCardTableTask::chunk_size()) / G1ClearCardTableTask::chunk_size();
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    uint const num_workers = (uint)MIN2(num_chunks, (size_t)workers->active_workers());
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    size_t const chunk_length = G1ClearCardTableTask::chunk_size() / HeapRegion::CardsPerRegion;
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    // Iterate over the dirty cards region list.
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    G1ClearCardTableTask cl(G1CollectedHeap::heap(), _dirty_region_buffer, _cur_dirty_region, chunk_length);
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    log_debug(gc, ergo)("Running %s using %u workers for " SIZE_FORMAT " "
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                        "units of work for " SIZE_FORMAT " regions.",
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                        cl.name(), num_workers, num_chunks, _cur_dirty_region);
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    workers->run_task(&cl, num_workers);
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#ifndef PRODUCT
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    G1CollectedHeap::heap()->verifier()->verify_card_table_cleanup();
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#endif
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  }
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};
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G1RemSet::G1RemSet(G1CollectedHeap* g1h,
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                   G1CardTable* ct,
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                   G1HotCardCache* hot_card_cache) :
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  _g1h(g1h),
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   284
  _scan_state(new G1RemSetScanState()),
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tschatzl
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   285
  _num_conc_refined_cards(0),
49164
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eosterlund
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   286
  _ct(ct),
49806
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   287
  _g1p(_g1h->g1_policy()),
38172
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kbarrett
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   288
  _hot_card_cache(hot_card_cache),
46670
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ehelin
parents: 46653
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   289
  _prev_period_summary() {
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   290
}
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   291
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cfa71cf3564d 6971296: G1: simplify G1RemSet class hierarchy
johnc
parents: 6759
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   292
G1RemSet::~G1RemSet() {
37988
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   293
  if (_scan_state != NULL) {
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
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   294
    delete _scan_state;
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032f4652700c 6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents: 2009
diff changeset
   295
  }
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   296
}
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   297
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   298
uint G1RemSet::num_par_rem_sets() {
49607
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diff changeset
   299
  return DirtyCardQueueSet::num_par_ids() + G1ConcurrentRefine::max_num_threads() + MAX2(ConcGCThreads, ParallelGCThreads);
35210
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   300
}
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   301
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   302
void G1RemSet::initialize(size_t capacity, uint max_regions) {
35210
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   303
  G1FromCardCache::initialize(num_par_rem_sets(), max_regions);
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   304
  _scan_state->initialize(max_regions);
35210
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   305
}
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diff changeset
   306
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   307
G1ScanRSForRegionClosure::G1ScanRSForRegionClosure(G1RemSetScanState* scan_state,
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   308
                                                   G1ScanObjsDuringScanRSClosure* scan_obj_on_card,
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   309
                                                   CodeBlobClosure* code_root_cl,
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   310
                                                   uint worker_i) :
37988
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parents: 37985
diff changeset
   311
  _scan_state(scan_state),
46572
fef0d64b2263 8175554: Improve G1UpdateRSOrPushRefClosure
tschatzl
parents: 46571
diff changeset
   312
  _scan_objs_on_card_cl(scan_obj_on_card),
35198
1365be812a7d 8145674: Fix includes and forward declarations in g1Remset files
tschatzl
parents: 35068
diff changeset
   313
  _code_root_cl(code_root_cl),
1365be812a7d 8145674: Fix includes and forward declarations in g1Remset files
tschatzl
parents: 35068
diff changeset
   314
  _strong_code_root_scan_time_sec(0.0),
46571
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   315
  _cards_claimed(0),
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   316
  _cards_scanned(0),
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   317
  _cards_skipped(0),
37988
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tschatzl
parents: 37985
diff changeset
   318
  _worker_i(worker_i) {
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   319
  _g1h = G1CollectedHeap::heap();
35461
1068dcb8d315 8146399: Refactor the BlockOffsetTable classes.
david
parents: 35210
diff changeset
   320
  _bot = _g1h->bot();
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   321
  _ct = _g1h->card_table();
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   322
}
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   323
46635
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   324
void G1ScanRSForRegionClosure::scan_card(MemRegion mr, uint region_idx_for_card) {
ef7cac5de811 8179679: Rearrange filters before card scanning
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parents: 46625
diff changeset
   325
  HeapRegion* const card_region = _g1h->region_at(region_idx_for_card);
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   326
  _scan_objs_on_card_cl->set_region(card_region);
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   327
  card_region->oops_on_card_seq_iterate_careful<true>(mr, _scan_objs_on_card_cl);
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   328
  _cards_scanned++;
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   329
}
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parents:
diff changeset
   330
46575
d6fb8a7a7843 8178151: Clean up G1RemSet files
tschatzl
parents: 46572
diff changeset
   331
void G1ScanRSForRegionClosure::scan_strong_code_roots(HeapRegion* r) {
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   332
  double scan_start = os::elapsedTime();
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   333
  r->strong_code_roots_do(_code_root_cl);
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   334
  _strong_code_root_scan_time_sec += (os::elapsedTime() - scan_start);
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   335
}
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   336
46635
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   337
void G1ScanRSForRegionClosure::claim_card(size_t card_index, const uint region_idx_for_card){
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   338
  _ct->set_card_claimed(card_index);
46635
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   339
  _scan_state->add_dirty_region(region_idx_for_card);
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   340
}
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   341
48950
f323537c9b75 8196602: Change HeapRegionClosure to comply to naming conventions
tschatzl
parents: 48103
diff changeset
   342
bool G1ScanRSForRegionClosure::do_heap_region(HeapRegion* r) {
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   343
  assert(r->in_collection_set(), "should only be called on elements of CS.");
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   344
  uint region_idx = r->hrm_index();
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   345
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   346
  if (_scan_state->iter_is_complete(region_idx)) {
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   347
    return false;
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   348
  }
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   349
  if (_scan_state->claim_iter(region_idx)) {
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   350
    // If we ever free the collection set concurrently, we should also
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   351
    // clear the card table concurrently therefore we won't need to
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   352
    // add regions of the collection set to the dirty cards region.
38154
4c30333c304e 8153507: Improve Card Table Clear Task
tschatzl
parents: 37988
diff changeset
   353
    _scan_state->add_dirty_region(region_idx);
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   354
  }
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   355
46575
d6fb8a7a7843 8178151: Clean up G1RemSet files
tschatzl
parents: 46572
diff changeset
   356
  // We claim cards in blocks so as to reduce the contention.
d6fb8a7a7843 8178151: Clean up G1RemSet files
tschatzl
parents: 46572
diff changeset
   357
  size_t const block_size = G1RSetScanBlockSize;
d6fb8a7a7843 8178151: Clean up G1RemSet files
tschatzl
parents: 46572
diff changeset
   358
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   359
  HeapRegionRemSetIterator iter(r->rem_set());
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   360
  size_t card_index;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   361
46575
d6fb8a7a7843 8178151: Clean up G1RemSet files
tschatzl
parents: 46572
diff changeset
   362
  size_t claimed_card_block = _scan_state->iter_claimed_next(region_idx, block_size);
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   363
  for (size_t current_card = 0; iter.has_next(card_index); current_card++) {
46575
d6fb8a7a7843 8178151: Clean up G1RemSet files
tschatzl
parents: 46572
diff changeset
   364
    if (current_card >= claimed_card_block + block_size) {
d6fb8a7a7843 8178151: Clean up G1RemSet files
tschatzl
parents: 46572
diff changeset
   365
      claimed_card_block = _scan_state->iter_claimed_next(region_idx, block_size);
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   366
    }
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   367
    if (current_card < claimed_card_block) {
46571
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   368
      _cards_skipped++;
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   369
      continue;
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   370
    }
46571
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   371
    _cards_claimed++;
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   372
46635
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   373
    // If the card is dirty, then G1 will scan it during Update RS.
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   374
    if (_ct->is_card_claimed(card_index) || _ct->is_card_dirty(card_index)) {
46635
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   375
      continue;
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   376
    }
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   377
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   378
    HeapWord* const card_start = _g1h->bot()->address_for_index(card_index);
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   379
    uint const region_idx_for_card = _g1h->addr_to_region(card_start);
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   380
46635
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   381
    assert(_g1h->region_at(region_idx_for_card)->is_in_reserved(card_start),
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   382
           "Card start " PTR_FORMAT " to scan outside of region %u", p2i(card_start), _g1h->region_at(region_idx_for_card)->hrm_index());
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   383
    HeapWord* const top = _scan_state->scan_top(region_idx_for_card);
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   384
    if (card_start >= top) {
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   385
      continue;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   386
    }
46635
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   387
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   388
    // We claim lazily (so races are possible but they're benign), which reduces the
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   389
    // number of duplicate scans (the rsets of the regions in the cset can intersect).
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   390
    // Claim the card after checking bounds above: the remembered set may contain
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   391
    // random cards into current survivor, and we would then have an incorrectly
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   392
    // claimed card in survivor space. Card table clear does not reset the card table
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   393
    // of survivor space regions.
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   394
    claim_card(card_index, region_idx_for_card);
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   395
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   396
    MemRegion const mr(card_start, MIN2(card_start + BOTConstants::N_words, top));
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   397
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   398
    scan_card(mr, region_idx_for_card);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   399
  }
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   400
  if (_scan_state->set_iter_complete(region_idx)) {
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   401
    // Scan the strong code root list attached to the current region
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   402
    scan_strong_code_roots(r);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   403
  }
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   404
  return false;
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   405
}
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   406
46572
fef0d64b2263 8175554: Improve G1UpdateRSOrPushRefClosure
tschatzl
parents: 46571
diff changeset
   407
void G1RemSet::scan_rem_set(G1ParScanThreadState* pss,
46571
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   408
                            CodeBlobClosure* heap_region_codeblobs,
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   409
                            uint worker_i) {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   410
  double rs_time_start = os::elapsedTime();
32617
a59435e1fecc 8135012: Don't use G1RootProcessor when scanning remembered sets
mgerdin
parents: 31592
diff changeset
   411
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   412
  G1ScanObjsDuringScanRSClosure scan_cl(_g1h, pss);
46575
d6fb8a7a7843 8178151: Clean up G1RemSet files
tschatzl
parents: 46572
diff changeset
   413
  G1ScanRSForRegionClosure cl(_scan_state, &scan_cl, heap_region_codeblobs, worker_i);
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   414
  _g1h->collection_set_iterate_from(&cl, worker_i);
10670
4ea0e7d2ffbc 6484982: G1: process references during evacuation pauses
johnc
parents: 10000
diff changeset
   415
46571
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   416
  double scan_rs_time_sec = (os::elapsedTime() - rs_time_start) -
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   417
                             cl.strong_code_root_scan_time_sec();
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   418
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   419
  G1GCPhaseTimes* p = _g1p->phase_times();
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   420
46571
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   421
  p->record_time_secs(G1GCPhaseTimes::ScanRS, worker_i, scan_rs_time_sec);
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   422
  p->record_thread_work_item(G1GCPhaseTimes::ScanRS, worker_i, cl.cards_scanned(), G1GCPhaseTimes::ScanRSScannedCards);
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   423
  p->record_thread_work_item(G1GCPhaseTimes::ScanRS, worker_i, cl.cards_claimed(), G1GCPhaseTimes::ScanRSClaimedCards);
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   424
  p->record_thread_work_item(G1GCPhaseTimes::ScanRS, worker_i, cl.cards_skipped(), G1GCPhaseTimes::ScanRSSkippedCards);
32737
f02118695c2f 8135154: Move cards scanned and surviving young words aggregation to G1ParScanThreadStateSet
mgerdin
parents: 32617
diff changeset
   425
46571
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   426
  p->record_time_secs(G1GCPhaseTimes::CodeRoots, worker_i, cl.strong_code_root_scan_time_sec());
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   427
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   428
46670
55a3c36b64b2 8183539: Remove G1RemSet::_into_cset_dirty_card_queue_set
ehelin
parents: 46653
diff changeset
   429
// Closure used for updating rem sets. Only called during an evacuation pause.
46580
130fde4acb34 8183122: Rename RefineRecordRefsIntoCSCardTableEntryClosure to G1RefineCardClosure
ehelin
parents: 46575
diff changeset
   430
class G1RefineCardClosure: public CardTableEntryClosure {
6247
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   431
  G1RemSet* _g1rs;
46572
fef0d64b2263 8175554: Improve G1UpdateRSOrPushRefClosure
tschatzl
parents: 46571
diff changeset
   432
  G1ScanObjsDuringUpdateRSClosure* _update_rs_cl;
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   433
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   434
  size_t _cards_scanned;
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   435
  size_t _cards_skipped;
6247
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   436
public:
46670
55a3c36b64b2 8183539: Remove G1RemSet::_into_cset_dirty_card_queue_set
ehelin
parents: 46653
diff changeset
   437
  G1RefineCardClosure(G1CollectedHeap* g1h, G1ScanObjsDuringUpdateRSClosure* update_rs_cl) :
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   438
    _g1rs(g1h->g1_rem_set()), _update_rs_cl(update_rs_cl), _cards_scanned(0), _cards_skipped(0)
6247
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   439
  {}
33204
b8a3901ac5b3 8069330: Adjustment of concurrent refinement thresholds does not take hot card cache into account
tschatzl
parents: 33105
diff changeset
   440
23855
c4574075402c 8016302: Change type of the number of GC workers to unsigned int (2)
vkempik
parents: 23455
diff changeset
   441
  bool do_card_ptr(jbyte* card_ptr, uint worker_i) {
6247
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   442
    // The only time we care about recording cards that
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   443
    // contain references that point into the collection set
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   444
    // is during RSet updating within an evacuation pause.
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   445
    // In this case worker_i should be the id of a GC worker thread.
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   446
    assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause");
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   447
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   448
    bool card_scanned = _g1rs->refine_card_during_gc(card_ptr, _update_rs_cl);
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   449
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   450
    if (card_scanned) {
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   451
      _cards_scanned++;
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   452
    } else {
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   453
      _cards_skipped++;
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   454
    }
6247
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   455
    return true;
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   456
  }
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   457
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   458
  size_t cards_scanned() const { return _cards_scanned; }
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   459
  size_t cards_skipped() const { return _cards_skipped; }
6247
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   460
};
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   461
46670
55a3c36b64b2 8183539: Remove G1RemSet::_into_cset_dirty_card_queue_set
ehelin
parents: 46653
diff changeset
   462
void G1RemSet::update_rem_set(G1ParScanThreadState* pss, uint worker_i) {
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   463
  G1ScanObjsDuringUpdateRSClosure update_rs_cl(_g1h, pss, worker_i);
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   464
  G1RefineCardClosure refine_card_cl(_g1h, &update_rs_cl);
10670
4ea0e7d2ffbc 6484982: G1: process references during evacuation pauses
johnc
parents: 10000
diff changeset
   465
33204
b8a3901ac5b3 8069330: Adjustment of concurrent refinement thresholds does not take hot card cache into account
tschatzl
parents: 33105
diff changeset
   466
  G1GCParPhaseTimesTracker x(_g1p->phase_times(), G1GCPhaseTimes::UpdateRS, worker_i);
38172
90f405aac699 8155524: HotCardCache shouldn't be part of ConcurrentG1Refine
kbarrett
parents: 38160
diff changeset
   467
  if (G1HotCardCache::default_use_cache()) {
33204
b8a3901ac5b3 8069330: Adjustment of concurrent refinement thresholds does not take hot card cache into account
tschatzl
parents: 33105
diff changeset
   468
    // Apply the closure to the entries of the hot card cache.
b8a3901ac5b3 8069330: Adjustment of concurrent refinement thresholds does not take hot card cache into account
tschatzl
parents: 33105
diff changeset
   469
    G1GCParPhaseTimesTracker y(_g1p->phase_times(), G1GCPhaseTimes::ScanHCC, worker_i);
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   470
    _g1h->iterate_hcc_closure(&refine_card_cl, worker_i);
33204
b8a3901ac5b3 8069330: Adjustment of concurrent refinement thresholds does not take hot card cache into account
tschatzl
parents: 33105
diff changeset
   471
  }
b8a3901ac5b3 8069330: Adjustment of concurrent refinement thresholds does not take hot card cache into account
tschatzl
parents: 33105
diff changeset
   472
  // Apply the closure to all remaining log entries.
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   473
  _g1h->iterate_dirty_card_closure(&refine_card_cl, worker_i);
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   474
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   475
  G1GCPhaseTimes* p = _g1p->phase_times();
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   476
  p->record_thread_work_item(G1GCPhaseTimes::UpdateRS, worker_i, refine_card_cl.cards_scanned(), G1GCPhaseTimes::UpdateRSScannedCards);
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   477
  p->record_thread_work_item(G1GCPhaseTimes::UpdateRS, worker_i, refine_card_cl.cards_skipped(), G1GCPhaseTimes::UpdateRSSkippedCards);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   478
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   479
6958
cfa71cf3564d 6971296: G1: simplify G1RemSet class hierarchy
johnc
parents: 6759
diff changeset
   480
void G1RemSet::cleanupHRRS() {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   481
  HeapRegionRemSet::cleanup();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   482
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   483
46572
fef0d64b2263 8175554: Improve G1UpdateRSOrPushRefClosure
tschatzl
parents: 46571
diff changeset
   484
void G1RemSet::oops_into_collection_set_do(G1ParScanThreadState* pss,
46571
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   485
                                           CodeBlobClosure* heap_region_codeblobs,
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   486
                                           uint worker_i) {
46670
55a3c36b64b2 8183539: Remove G1RemSet::_into_cset_dirty_card_queue_set
ehelin
parents: 46653
diff changeset
   487
  update_rem_set(pss, worker_i);
46572
fef0d64b2263 8175554: Improve G1UpdateRSOrPushRefClosure
tschatzl
parents: 46571
diff changeset
   488
  scan_rem_set(pss, heap_region_codeblobs, worker_i);;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   489
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   490
6958
cfa71cf3564d 6971296: G1: simplify G1RemSet class hierarchy
johnc
parents: 6759
diff changeset
   491
void G1RemSet::prepare_for_oops_into_collection_set_do() {
49751
c3a10df652c0 8201316: Move G1-related static members from JavaThread to G1BarrierSet
pliden
parents: 49634
diff changeset
   492
  DirtyCardQueueSet& dcqs = G1BarrierSet::dirty_card_queue_set();
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   493
  dcqs.concatenate_logs();
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   494
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   495
  _scan_state->reset();
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   496
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   497
6958
cfa71cf3564d 6971296: G1: simplify G1RemSet class hierarchy
johnc
parents: 6759
diff changeset
   498
void G1RemSet::cleanup_after_oops_into_collection_set_do() {
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   499
  G1GCPhaseTimes* phase_times = _g1h->g1_policy()->phase_times();
38154
4c30333c304e 8153507: Improve Card Table Clear Task
tschatzl
parents: 37988
diff changeset
   500
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   501
  // Set all cards back to clean.
38154
4c30333c304e 8153507: Improve Card Table Clear Task
tschatzl
parents: 37988
diff changeset
   502
  double start = os::elapsedTime();
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   503
  _scan_state->clear_card_table(_g1h->workers());
38154
4c30333c304e 8153507: Improve Card Table Clear Task
tschatzl
parents: 37988
diff changeset
   504
  phase_times->record_clear_ct_time((os::elapsedTime() - start) * 1000.0);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   505
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   506
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   507
inline void check_card_ptr(jbyte* card_ptr, G1CardTable* ct) {
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   508
#ifdef ASSERT
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   509
  G1CollectedHeap* g1h = G1CollectedHeap::heap();
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   510
  assert(g1h->is_in_exact(ct->addr_for(card_ptr)),
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   511
         "Card at " PTR_FORMAT " index " SIZE_FORMAT " representing heap at " PTR_FORMAT " (%u) must be in committed heap",
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   512
         p2i(card_ptr),
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   513
         ct->index_for(ct->addr_for(card_ptr)),
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   514
         p2i(ct->addr_for(card_ptr)),
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   515
         g1h->addr_to_region(ct->addr_for(card_ptr)));
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   516
#endif
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   517
}
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   518
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   519
void G1RemSet::refine_card_concurrently(jbyte* card_ptr,
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   520
                                        uint worker_i) {
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   521
  assert(!_g1h->is_gc_active(), "Only call concurrently");
17327
4bd0581aa231 7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents: 17108
diff changeset
   522
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   523
  check_card_ptr(card_ptr, _ct);
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   524
17327
4bd0581aa231 7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents: 17108
diff changeset
   525
  // If the card is no longer dirty, nothing to do.
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   526
  if (*card_ptr != G1CardTable::dirty_card_val()) {
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   527
    return;
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   528
  }
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   529
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   530
  // Construct the region representing the card.
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   531
  HeapWord* start = _ct->addr_for(card_ptr);
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   532
  // And find the region containing it.
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   533
  HeapRegion* r = _g1h->heap_region_containing(start);
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   534
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   535
  // This check is needed for some uncommon cases where we should
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   536
  // ignore the card.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   537
  //
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   538
  // The region could be young.  Cards for young regions are
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   539
  // distinctly marked (set to g1_young_gen), so the post-barrier will
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   540
  // filter them out.  However, that marking is performed
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   541
  // concurrently.  A write to a young object could occur before the
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   542
  // card has been marked young, slipping past the filter.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   543
  //
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   544
  // The card could be stale, because the region has been freed since
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   545
  // the card was recorded. In this case the region type could be
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   546
  // anything.  If (still) free or (reallocated) young, just ignore
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   547
  // it.  If (reallocated) old or humongous, the later card trimming
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   548
  // and additional checks in iteration may detect staleness.  At
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   549
  // worst, we end up processing a stale card unnecessarily.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   550
  //
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   551
  // In the normal (non-stale) case, the synchronization between the
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   552
  // enqueueing of the card and processing it here will have ensured
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   553
  // we see the up-to-date region type here.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   554
  if (!r->is_old_or_humongous()) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   555
    return;
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   556
  }
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   557
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   558
  // The result from the hot card cache insert call is either:
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   559
  //   * pointer to the current card
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   560
  //     (implying that the current card is not 'hot'),
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   561
  //   * null
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   562
  //     (meaning we had inserted the card ptr into the "hot" card cache,
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   563
  //     which had some headroom),
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   564
  //   * a pointer to a "hot" card that was evicted from the "hot" cache.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   565
  //
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   566
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   567
  if (_hot_card_cache->use_cache()) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   568
    assert(!SafepointSynchronize::is_at_safepoint(), "sanity");
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   569
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   570
    const jbyte* orig_card_ptr = card_ptr;
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   571
    card_ptr = _hot_card_cache->insert(card_ptr);
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   572
    if (card_ptr == NULL) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   573
      // There was no eviction. Nothing to do.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   574
      return;
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   575
    } else if (card_ptr != orig_card_ptr) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   576
      // Original card was inserted and an old card was evicted.
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   577
      start = _ct->addr_for(card_ptr);
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   578
      r = _g1h->heap_region_containing(start);
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   579
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   580
      // Check whether the region formerly in the cache should be
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   581
      // ignored, as discussed earlier for the original card.  The
49346
14e84a4edb9c 8198546: [Redo] JDK-8196883 G1RemSet::refine_card_concurrently doesn't need to check for cards in collection set
tschatzl
parents: 49194
diff changeset
   582
      // region could have been freed while in the cache.
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   583
      if (!r->is_old_or_humongous()) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   584
        return;
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   585
      }
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   586
    } // Else we still have the original card.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   587
  }
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   588
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   589
  // Trim the region designated by the card to what's been allocated
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   590
  // in the region.  The card could be stale, or the card could cover
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   591
  // (part of) an object at the end of the allocated space and extend
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   592
  // beyond the end of allocation.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   593
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   594
  // Non-humongous objects are only allocated in the old-gen during
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   595
  // GC, so if region is old then top is stable.  Humongous object
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   596
  // allocation sets top last; if top has not yet been set, this is
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   597
  // a stale card and we'll end up with an empty intersection.  If
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   598
  // this is not a stale card, the synchronization between the
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   599
  // enqueuing of the card and processing it here will have ensured
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   600
  // we see the up-to-date top here.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   601
  HeapWord* scan_limit = r->top();
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   602
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   603
  if (scan_limit <= start) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   604
    // If the trimmed region is empty, the card must be stale.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   605
    return;
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   606
  }
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   607
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   608
  // Okay to clean and process the card now.  There are still some
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   609
  // stale card cases that may be detected by iteration and dealt with
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   610
  // as iteration failure.
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   611
  *const_cast<volatile jbyte*>(card_ptr) = G1CardTable::clean_card_val();
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   612
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   613
  // This fence serves two purposes.  First, the card must be cleaned
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   614
  // before processing the contents.  Second, we can't proceed with
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   615
  // processing until after the read of top, for synchronization with
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   616
  // possibly concurrent humongous object allocation.  It's okay that
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   617
  // reading top and reading type were racy wrto each other.  We need
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   618
  // both set, in any order, to proceed.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   619
  OrderAccess::fence();
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   620
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   621
  // Don't use addr_for(card_ptr + 1) which can ask for
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   622
  // a card beyond the heap.
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   623
  HeapWord* end = start + G1CardTable::card_size_in_words;
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   624
  MemRegion dirty_region(start, MIN2(scan_limit, end));
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   625
  assert(!dirty_region.is_empty(), "sanity");
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   626
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   627
  G1ConcurrentRefineOopClosure conc_refine_cl(_g1h, worker_i);
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   628
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   629
  bool card_processed =
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   630
    r->oops_on_card_seq_iterate_careful<false>(dirty_region, &conc_refine_cl);
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   631
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   632
  // If unable to process the card then we encountered an unparsable
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   633
  // part of the heap (e.g. a partially allocated object) while
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   634
  // processing a stale card.  Despite the card being stale, redirty
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   635
  // and re-enqueue, because we've already cleaned the card.  Without
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   636
  // this we could incorrectly discard a non-stale card.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   637
  if (!card_processed) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   638
    // The card might have gotten re-dirtied and re-enqueued while we
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   639
    // worked.  (In fact, it's pretty likely.)
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   640
    if (*card_ptr != G1CardTable::dirty_card_val()) {
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   641
      *card_ptr = G1CardTable::dirty_card_val();
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   642
      MutexLockerEx x(Shared_DirtyCardQ_lock,
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   643
                      Mutex::_no_safepoint_check_flag);
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   644
      DirtyCardQueue* sdcq =
49751
c3a10df652c0 8201316: Move G1-related static members from JavaThread to G1BarrierSet
pliden
parents: 49634
diff changeset
   645
        G1BarrierSet::dirty_card_queue_set().shared_dirty_card_queue();
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   646
      sdcq->enqueue(card_ptr);
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   647
    }
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   648
  } else {
46614
ae1105fff9e4 8179677: Let G1Remset::_conc_refined_cards only count number of cards concurrently refined
tschatzl
parents: 46611
diff changeset
   649
    _num_conc_refined_cards++; // Unsynchronized update, only used for logging.
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   650
  }
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   651
}
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   652
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   653
bool G1RemSet::refine_card_during_gc(jbyte* card_ptr,
46572
fef0d64b2263 8175554: Improve G1UpdateRSOrPushRefClosure
tschatzl
parents: 46571
diff changeset
   654
                                     G1ScanObjsDuringUpdateRSClosure* update_rs_cl) {
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   655
  assert(_g1h->is_gc_active(), "Only call during GC");
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   656
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   657
  check_card_ptr(card_ptr, _ct);
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   658
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   659
  // If the card is no longer dirty, nothing to do. This covers cards that were already
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   660
  // scanned as parts of the remembered sets.
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   661
  if (*card_ptr != G1CardTable::dirty_card_val()) {
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   662
    return false;
17327
4bd0581aa231 7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents: 17108
diff changeset
   663
  }
4bd0581aa231 7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents: 17108
diff changeset
   664
46676
dff06ff9effe 8183538: UpdateRS phase should claim cards
tschatzl
parents: 46670
diff changeset
   665
  // We claim lazily (so races are possible but they're benign), which reduces the
dff06ff9effe 8183538: UpdateRS phase should claim cards
tschatzl
parents: 46670
diff changeset
   666
  // number of potential duplicate scans (multiple threads may enqueue the same card twice).
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   667
  *card_ptr = G1CardTable::clean_card_val() | G1CardTable::claimed_card_val();
17327
4bd0581aa231 7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents: 17108
diff changeset
   668
46520
de5cb3eed39b 8177044: Remove _scan_top from HeapRegion
tschatzl
parents: 46519
diff changeset
   669
  // Construct the region representing the card.
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   670
  HeapWord* card_start = _ct->addr_for(card_ptr);
46520
de5cb3eed39b 8177044: Remove _scan_top from HeapRegion
tschatzl
parents: 46519
diff changeset
   671
  // And find the region containing it.
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   672
  uint const card_region_idx = _g1h->addr_to_region(card_start);
46520
de5cb3eed39b 8177044: Remove _scan_top from HeapRegion
tschatzl
parents: 46519
diff changeset
   673
46676
dff06ff9effe 8183538: UpdateRS phase should claim cards
tschatzl
parents: 46670
diff changeset
   674
  _scan_state->add_dirty_region(card_region_idx);
dff06ff9effe 8183538: UpdateRS phase should claim cards
tschatzl
parents: 46670
diff changeset
   675
  HeapWord* scan_limit = _scan_state->scan_top(card_region_idx);
46520
de5cb3eed39b 8177044: Remove _scan_top from HeapRegion
tschatzl
parents: 46519
diff changeset
   676
  if (scan_limit <= card_start) {
de5cb3eed39b 8177044: Remove _scan_top from HeapRegion
tschatzl
parents: 46519
diff changeset
   677
    // If the card starts above the area in the region containing objects to scan, skip it.
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   678
    return false;
17327
4bd0581aa231 7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents: 17108
diff changeset
   679
  }
4bd0581aa231 7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents: 17108
diff changeset
   680
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13516
diff changeset
   681
  // Don't use addr_for(card_ptr + 1) which can ask for
42589
037b433e8069 8166811: Missing memory fences between memory allocation and refinement
kbarrett
parents: 42588
diff changeset
   682
  // a card beyond the heap.
49164
7e958a8ebcd3 8195142: Refactor out card table from CardTableModRefBS to flatten the BarrierSet hierarchy
eosterlund
parents: 48969
diff changeset
   683
  HeapWord* card_end = card_start + G1CardTable::card_size_in_words;
46520
de5cb3eed39b 8177044: Remove _scan_top from HeapRegion
tschatzl
parents: 46519
diff changeset
   684
  MemRegion dirty_region(card_start, MIN2(scan_limit, card_end));
42589
037b433e8069 8166811: Missing memory fences between memory allocation and refinement
kbarrett
parents: 42588
diff changeset
   685
  assert(!dirty_region.is_empty(), "sanity");
3590
a268fa66d7fb 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 3262
diff changeset
   686
49806
2d62570a615c 8200426: Make G1 code use _g1h members
tschatzl
parents: 49803
diff changeset
   687
  HeapRegion* const card_region = _g1h->region_at(card_region_idx);
46676
dff06ff9effe 8183538: UpdateRS phase should claim cards
tschatzl
parents: 46670
diff changeset
   688
  update_rs_cl->set_region(card_region);
dff06ff9effe 8183538: UpdateRS phase should claim cards
tschatzl
parents: 46670
diff changeset
   689
  bool card_processed = card_region->oops_on_card_seq_iterate_careful<true>(dirty_region, update_rs_cl);
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   690
  assert(card_processed, "must be");
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   691
  return true;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   692
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   693
35061
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   694
void G1RemSet::print_periodic_summary_info(const char* header, uint period_count) {
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   695
  if ((G1SummarizeRSetStatsPeriod > 0) && log_is_enabled(Trace, gc, remset) &&
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   696
      (period_count % G1SummarizeRSetStatsPeriod == 0)) {
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   697
46652
ab8716d193bb 8183226: Remembered set summarization accesses not fully initialized java thread DCQS
tschatzl
parents: 46635
diff changeset
   698
    G1RemSetSummary current(this);
35061
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   699
    _prev_period_summary.subtract_from(&current);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   700
37242
91e5f98fff6f 8152632: Rename LogHandle(...) to Log(...)
stefank
parents: 36374
diff changeset
   701
    Log(gc, remset) log;
35061
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   702
    log.trace("%s", header);
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   703
    ResourceMark rm;
46701
f559541c0daa 8181917: Refactor UL LogStreams to avoid using resource area
stuefe
parents: 46676
diff changeset
   704
    LogStream ls(log.trace());
f559541c0daa 8181917: Refactor UL LogStreams to avoid using resource area
stuefe
parents: 46676
diff changeset
   705
    _prev_period_summary.print_on(&ls);
35061
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   706
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   707
    _prev_period_summary.set(&current);
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   708
  }
17854
d65bc1546091 8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
parents: 17327
diff changeset
   709
}
2881
74a1337e4acc 6484957: G1: parallel concurrent refinement
iveresov
parents: 2741
diff changeset
   710
6958
cfa71cf3564d 6971296: G1: simplify G1RemSet class hierarchy
johnc
parents: 6759
diff changeset
   711
void G1RemSet::print_summary_info() {
37242
91e5f98fff6f 8152632: Rename LogHandle(...) to Log(...)
stefank
parents: 36374
diff changeset
   712
  Log(gc, remset, exit) log;
35061
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   713
  if (log.is_trace()) {
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   714
    log.trace(" Cumulative RS summary");
46653
d72083d17b19 8183128: Update RefineCardTableEntryClosure
tschatzl
parents: 46652
diff changeset
   715
    G1RemSetSummary current(this);
35061
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   716
    ResourceMark rm;
46701
f559541c0daa 8181917: Refactor UL LogStreams to avoid using resource area
stuefe
parents: 46676
diff changeset
   717
    LogStream ls(log.trace());
f559541c0daa 8181917: Refactor UL LogStreams to avoid using resource area
stuefe
parents: 46676
diff changeset
   718
    current.print_on(&ls);
17854
d65bc1546091 8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
parents: 17327
diff changeset
   719
  }
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   720
}
6247
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   721
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   722
class G1RebuildRemSetTask: public AbstractGangTask {
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   723
  // Aggregate the counting data that was constructed concurrently
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   724
  // with marking.
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   725
  class G1RebuildRemSetHeapRegionClosure : public HeapRegionClosure {
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   726
    G1ConcurrentMark* _cm;
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   727
    G1RebuildRemSetClosure _update_cl;
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   728
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   729
    // Applies _update_cl to the references of the given object, limiting objArrays
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   730
    // to the given MemRegion. Returns the amount of words actually scanned.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   731
    size_t scan_for_references(oop const obj, MemRegion mr) {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   732
      size_t const obj_size = obj->size();
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   733
      // All non-objArrays and objArrays completely within the mr
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   734
      // can be scanned without passing the mr.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   735
      if (!obj->is_objArray() || mr.contains(MemRegion((HeapWord*)obj, obj_size))) {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   736
        obj->oop_iterate(&_update_cl);
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   737
        return obj_size;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   738
      }
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   739
      // This path is for objArrays crossing the given MemRegion. Only scan the
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   740
      // area within the MemRegion.
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   741
      obj->oop_iterate(&_update_cl, mr);
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   742
      return mr.intersection(MemRegion((HeapWord*)obj, obj_size)).word_size();
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   743
    }
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   744
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   745
    // A humongous object is live (with respect to the scanning) either
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   746
    // a) it is marked on the bitmap as such
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   747
    // b) its TARS is larger than TAMS, i.e. has been allocated during marking.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   748
    bool is_humongous_live(oop const humongous_obj, const G1CMBitMap* const bitmap, HeapWord* tams, HeapWord* tars) const {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   749
      return bitmap->is_marked(humongous_obj) || (tars > tams);
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   750
    }
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   751
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   752
    // Iterator over the live objects within the given MemRegion.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   753
    class LiveObjIterator : public StackObj {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   754
      const G1CMBitMap* const _bitmap;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   755
      const HeapWord* _tams;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   756
      const MemRegion _mr;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   757
      HeapWord* _current;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   758
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   759
      bool is_below_tams() const {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   760
        return _current < _tams;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   761
      }
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   762
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   763
      bool is_live(HeapWord* obj) const {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   764
        return !is_below_tams() || _bitmap->is_marked(obj);
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   765
      }
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   766
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   767
      HeapWord* bitmap_limit() const {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   768
        return MIN2(const_cast<HeapWord*>(_tams), _mr.end());
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   769
      }
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   770
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   771
      void move_if_below_tams() {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   772
        if (is_below_tams() && has_next()) {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   773
          _current = _bitmap->get_next_marked_addr(_current, bitmap_limit());
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   774
        }
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   775
      }
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   776
    public:
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   777
      LiveObjIterator(const G1CMBitMap* const bitmap, const HeapWord* tams, const MemRegion mr, HeapWord* first_oop_into_mr) :
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   778
          _bitmap(bitmap),
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   779
          _tams(tams),
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   780
          _mr(mr),
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   781
          _current(first_oop_into_mr) {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   782
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   783
        assert(_current <= _mr.start(),
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   784
               "First oop " PTR_FORMAT " should extend into mr [" PTR_FORMAT ", " PTR_FORMAT ")",
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   785
               p2i(first_oop_into_mr), p2i(mr.start()), p2i(mr.end()));
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   786
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   787
        // Step to the next live object within the MemRegion if needed.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   788
        if (is_live(_current)) {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   789
          // Non-objArrays were scanned by the previous part of that region.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   790
          if (_current < mr.start() && !oop(_current)->is_objArray()) {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   791
            _current += oop(_current)->size();
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   792
            // We might have positioned _current on a non-live object. Reposition to the next
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   793
            // live one if needed.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   794
            move_if_below_tams();
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   795
          }
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   796
        } else {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   797
          // The object at _current can only be dead if below TAMS, so we can use the bitmap.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   798
          // immediately.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   799
          _current = _bitmap->get_next_marked_addr(_current, bitmap_limit());
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   800
          assert(_current == _mr.end() || is_live(_current),
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   801
                 "Current " PTR_FORMAT " should be live (%s) or beyond the end of the MemRegion (" PTR_FORMAT ")",
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   802
                 p2i(_current), BOOL_TO_STR(is_live(_current)), p2i(_mr.end()));
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   803
        }
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   804
      }
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   805
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   806
      void move_to_next() {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   807
        _current += next()->size();
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   808
        move_if_below_tams();
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   809
      }
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   810
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   811
      oop next() const {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   812
        oop result = oop(_current);
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   813
        assert(is_live(_current),
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   814
               "Object " PTR_FORMAT " must be live TAMS " PTR_FORMAT " below %d mr " PTR_FORMAT " " PTR_FORMAT " outside %d",
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   815
               p2i(_current), p2i(_tams), _tams > _current, p2i(_mr.start()), p2i(_mr.end()), _mr.contains(result));
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   816
        return result;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   817
      }
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   818
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   819
      bool has_next() const {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   820
        return _current < _mr.end();
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   821
      }
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   822
    };
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   823
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   824
    // Rebuild remembered sets in the part of the region specified by mr and hr.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   825
    // Objects between the bottom of the region and the TAMS are checked for liveness
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   826
    // using the given bitmap. Objects between TAMS and TARS are assumed to be live.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   827
    // Returns the number of live words between bottom and TAMS.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   828
    size_t rebuild_rem_set_in_region(const G1CMBitMap* const bitmap,
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   829
                                     HeapWord* const top_at_mark_start,
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   830
                                     HeapWord* const top_at_rebuild_start,
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   831
                                     HeapRegion* hr,
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   832
                                     MemRegion mr) {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   833
      size_t marked_words = 0;
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   834
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   835
      if (hr->is_humongous()) {
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   836
        oop const humongous_obj = oop(hr->humongous_start_region()->bottom());
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   837
        if (is_humongous_live(humongous_obj, bitmap, top_at_mark_start, top_at_rebuild_start)) {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   838
          // We need to scan both [bottom, TAMS) and [TAMS, top_at_rebuild_start);
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   839
          // however in case of humongous objects it is sufficient to scan the encompassing
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   840
          // area (top_at_rebuild_start is always larger or equal to TAMS) as one of the
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   841
          // two areas will be zero sized. I.e. TAMS is either
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   842
          // the same as bottom or top(_at_rebuild_start). There is no way TAMS has a different
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   843
          // value: this would mean that TAMS points somewhere into the object.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   844
          assert(hr->top() == top_at_mark_start || hr->top() == top_at_rebuild_start,
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   845
                 "More than one object in the humongous region?");
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   846
          humongous_obj->oop_iterate(&_update_cl, mr);
49803
14518ac8df87 8178105: Switch mark bitmaps during Remark
tschatzl
parents: 49751
diff changeset
   847
          return top_at_mark_start != hr->bottom() ? mr.intersection(MemRegion((HeapWord*)humongous_obj, humongous_obj->size())).byte_size() : 0;
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   848
        } else {
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   849
          return 0;
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   850
        }
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   851
      }
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   852
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   853
      for (LiveObjIterator it(bitmap, top_at_mark_start, mr, hr->block_start(mr.start())); it.has_next(); it.move_to_next()) {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   854
        oop obj = it.next();
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   855
        size_t scanned_size = scan_for_references(obj, mr);
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   856
        if ((HeapWord*)obj < top_at_mark_start) {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   857
          marked_words += scanned_size;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   858
        }
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   859
      }
37414
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   860
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   861
      return marked_words * HeapWordSize;
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   862
    }
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   863
public:
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   864
  G1RebuildRemSetHeapRegionClosure(G1CollectedHeap* g1h,
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   865
                                   G1ConcurrentMark* cm,
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   866
                                   uint worker_id) :
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   867
    HeapRegionClosure(),
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   868
    _cm(cm),
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   869
    _update_cl(g1h, worker_id) { }
37414
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   870
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   871
    bool do_heap_region(HeapRegion* hr) {
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   872
      if (_cm->has_aborted()) {
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   873
        return true;
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   874
      }
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   875
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   876
      uint const region_idx = hr->hrm_index();
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   877
      DEBUG_ONLY(HeapWord* const top_at_rebuild_start_check = _cm->top_at_rebuild_start(region_idx);)
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   878
      assert(top_at_rebuild_start_check == NULL ||
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   879
             top_at_rebuild_start_check > hr->bottom(),
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   880
             "A TARS (" PTR_FORMAT ") == bottom() (" PTR_FORMAT ") indicates the old region %u is empty (%s)",
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   881
             p2i(top_at_rebuild_start_check), p2i(hr->bottom()),  region_idx, hr->get_type_str());
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   882
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   883
      size_t total_marked_bytes = 0;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   884
      size_t const chunk_size_in_words = G1RebuildRemSetChunkSize / HeapWordSize;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   885
49803
14518ac8df87 8178105: Switch mark bitmaps during Remark
tschatzl
parents: 49751
diff changeset
   886
      HeapWord* const top_at_mark_start = hr->prev_top_at_mark_start();
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   887
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   888
      HeapWord* cur = hr->bottom();
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   889
      while (cur < hr->end()) {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   890
        // After every iteration (yield point) we need to check whether the region's
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   891
        // TARS changed due to e.g. eager reclaim.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   892
        HeapWord* const top_at_rebuild_start = _cm->top_at_rebuild_start(region_idx);
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   893
        if (top_at_rebuild_start == NULL) {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   894
          return false;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   895
        }
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   896
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   897
        MemRegion next_chunk = MemRegion(hr->bottom(), top_at_rebuild_start).intersection(MemRegion(cur, chunk_size_in_words));
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   898
        if (next_chunk.is_empty()) {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   899
          break;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   900
        }
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   901
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   902
        const Ticks start = Ticks::now();
49803
14518ac8df87 8178105: Switch mark bitmaps during Remark
tschatzl
parents: 49751
diff changeset
   903
        size_t marked_bytes = rebuild_rem_set_in_region(_cm->prev_mark_bitmap(),
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   904
                                                        top_at_mark_start,
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   905
                                                        top_at_rebuild_start,
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   906
                                                        hr,
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   907
                                                        next_chunk);
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   908
        Tickspan time = Ticks::now() - start;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   909
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   910
        log_trace(gc, remset, tracking)("Rebuilt region %u "
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   911
                                        "live " SIZE_FORMAT " "
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   912
                                        "time %.3fms "
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   913
                                        "marked bytes " SIZE_FORMAT " "
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   914
                                        "bot " PTR_FORMAT " "
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   915
                                        "TAMS " PTR_FORMAT " "
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   916
                                        "TARS " PTR_FORMAT,
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   917
                                        region_idx,
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   918
                                        _cm->liveness(region_idx) * HeapWordSize,
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   919
                                        TicksToTimeHelper::seconds(time) * 1000.0,
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   920
                                        marked_bytes,
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   921
                                        p2i(hr->bottom()),
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   922
                                        p2i(top_at_mark_start),
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   923
                                        p2i(top_at_rebuild_start));
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   924
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   925
        if (marked_bytes > 0) {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   926
          total_marked_bytes += marked_bytes;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   927
        }
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   928
        cur += chunk_size_in_words;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   929
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   930
        _cm->do_yield_check();
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   931
        if (_cm->has_aborted()) {
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   932
          return true;
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   933
        }
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   934
      }
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   935
      // In the final iteration of the loop the region might have been eagerly reclaimed.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   936
      // Simply filter out those regions. We can not just use region type because there
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   937
      // might have already been new allocations into these regions.
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   938
      DEBUG_ONLY(HeapWord* const top_at_rebuild_start = _cm->top_at_rebuild_start(region_idx);)
49803
14518ac8df87 8178105: Switch mark bitmaps during Remark
tschatzl
parents: 49751
diff changeset
   939
      assert(top_at_rebuild_start == NULL ||
14518ac8df87 8178105: Switch mark bitmaps during Remark
tschatzl
parents: 49751
diff changeset
   940
             total_marked_bytes == hr->marked_bytes(),
14518ac8df87 8178105: Switch mark bitmaps during Remark
tschatzl
parents: 49751
diff changeset
   941
             "Marked bytes " SIZE_FORMAT " for region %u (%s) in [bottom, TAMS) do not match calculated marked bytes " SIZE_FORMAT " "
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   942
             "(" PTR_FORMAT " " PTR_FORMAT " " PTR_FORMAT ")",
49803
14518ac8df87 8178105: Switch mark bitmaps during Remark
tschatzl
parents: 49751
diff changeset
   943
             total_marked_bytes, hr->hrm_index(), hr->get_type_str(), hr->marked_bytes(),
49634
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   944
             p2i(hr->bottom()), p2i(top_at_mark_start), p2i(top_at_rebuild_start));
df9dcfff6628 8197932: Better split work in rebuild remembered sets phase
tschatzl
parents: 49632
diff changeset
   945
       // Abort state may have changed after the yield check.
49607
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   946
      return _cm->has_aborted();
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   947
    }
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   948
  };
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   949
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   950
  HeapRegionClaimer _hr_claimer;
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   951
  G1ConcurrentMark* _cm;
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   952
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   953
  uint _worker_id_offset;
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   954
public:
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   955
  G1RebuildRemSetTask(G1ConcurrentMark* cm,
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   956
                      uint n_workers,
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   957
                      uint worker_id_offset) :
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   958
      AbstractGangTask("G1 Rebuild Remembered Set"),
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   959
      _cm(cm),
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   960
      _hr_claimer(n_workers),
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   961
      _worker_id_offset(worker_id_offset) {
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   962
  }
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   963
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   964
  void work(uint worker_id) {
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   965
    SuspendibleThreadSetJoiner sts_join;
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   966
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   967
    G1CollectedHeap* g1h = G1CollectedHeap::heap();
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   968
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   969
    G1RebuildRemSetHeapRegionClosure cl(g1h, _cm, _worker_id_offset + worker_id);
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   970
    g1h->heap_region_par_iterate_from_worker_offset(&cl, &_hr_claimer, worker_id);
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   971
  }
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   972
};
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   973
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   974
void G1RemSet::rebuild_rem_set(G1ConcurrentMark* cm,
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   975
                               WorkGang* workers,
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   976
                               uint worker_id_offset) {
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   977
  uint num_workers = workers->active_workers();
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   978
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   979
  G1RebuildRemSetTask cl(cm,
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   980
                         num_workers,
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   981
                         worker_id_offset);
acffe6ff3ae7 8180415: Rebuild remembered sets during the concurrent cycle
tschatzl
parents: 49347
diff changeset
   982
  workers->run_task(&cl, num_workers);
37414
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   983
}