src/hotspot/share/gc/g1/g1RemSet.cpp
author tschatzl
Thu, 08 Feb 2018 10:15:57 +0100
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parent 48103 26dbe08d1c17
child 48889 216c2aabbf1f
child 48954 c8a33db795b6
permissions -rw-r--r--
8196883: G1RemSet::refine_card_concurrently doesn't need to check for cards in collection set Summary: Remove code related to collection set checking in that method. Reviewed-by: kbarrett, ehelin
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/*
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 * Copyright (c) 2001, 2017, 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/g1BlockOffsetTable.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/g1SATBCardTableModRefBS.inline.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/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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// 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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      G1SATBCardTableModRefBS* ct_bs = _g1h->g1_barrier_set();
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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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            ct_bs->clear(MemRegion(r->bottom(), r->end()));
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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 doHeapRegion(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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    jint res = Atomic::cmpxchg(Claimed, (jint*)(&_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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    jint res = Atomic::cmpxchg(Complete, (jint*)(&_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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    // Need to synchronize with concurrent cleanup since it needs to
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    // finish its card table clearing before we can verify.
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    G1CollectedHeap::heap()->wait_while_free_regions_coming();
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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* g1,
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                   CardTableModRefBS* ct_bs,
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   284
                   G1HotCardCache* hot_card_cache) :
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   285
  _g1(g1),
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   286
  _scan_state(new G1RemSetScanState()),
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   287
  _num_conc_refined_cards(0),
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   288
  _ct_bs(ct_bs),
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   289
  _g1p(_g1->g1_policy()),
38172
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   290
  _hot_card_cache(hot_card_cache),
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parents: 46653
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   291
  _prev_period_summary() {
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   292
}
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parents:
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   293
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johnc
parents: 6759
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   294
G1RemSet::~G1RemSet() {
37988
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   295
  if (_scan_state != NULL) {
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   296
    delete _scan_state;
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parents: 2009
diff changeset
   297
  }
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   298
}
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   299
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   300
uint G1RemSet::num_par_rem_sets() {
48103
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diff changeset
   301
  return MAX2(DirtyCardQueueSet::num_par_ids() + G1ConcurrentRefine::max_num_threads(), ParallelGCThreads);
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   302
}
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   303
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   304
void G1RemSet::initialize(size_t capacity, uint max_regions) {
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   305
  G1FromCardCache::initialize(num_par_rem_sets(), max_regions);
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   306
  _scan_state->initialize(max_regions);
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   307
  {
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   308
    GCTraceTime(Debug, gc, marking)("Initialize Card Live Data");
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diff changeset
   309
    _card_live_data.initialize(capacity, max_regions);
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   310
  }
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
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diff changeset
   311
  if (G1PretouchAuxiliaryMemory) {
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
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diff changeset
   312
    GCTraceTime(Debug, gc, marking)("Pre-Touch Card Live Data");
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   313
    _card_live_data.pretouch();
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
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diff changeset
   314
  }
35210
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diff changeset
   315
}
eb1d5c68bf64 8145672: Remove dependency of G1FromCardCache to HeapRegionRemSet
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parents: 35198
diff changeset
   316
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   317
G1ScanRSForRegionClosure::G1ScanRSForRegionClosure(G1RemSetScanState* scan_state,
d6fb8a7a7843 8178151: Clean up G1RemSet files
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   318
                                                   G1ScanObjsDuringScanRSClosure* scan_obj_on_card,
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   319
                                                   CodeBlobClosure* code_root_cl,
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   320
                                                   uint worker_i) :
37988
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diff changeset
   321
  _scan_state(scan_state),
46572
fef0d64b2263 8175554: Improve G1UpdateRSOrPushRefClosure
tschatzl
parents: 46571
diff changeset
   322
  _scan_objs_on_card_cl(scan_obj_on_card),
35198
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parents: 35068
diff changeset
   323
  _code_root_cl(code_root_cl),
1365be812a7d 8145674: Fix includes and forward declarations in g1Remset files
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parents: 35068
diff changeset
   324
  _strong_code_root_scan_time_sec(0.0),
46571
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tschatzl
parents: 46520
diff changeset
   325
  _cards_claimed(0),
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   326
  _cards_scanned(0),
c70b36f0730d 8178148: Log more detailed information about scan rs phase
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diff changeset
   327
  _cards_skipped(0),
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parents: 37985
diff changeset
   328
  _worker_i(worker_i) {
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   329
  _g1h = G1CollectedHeap::heap();
35461
1068dcb8d315 8146399: Refactor the BlockOffsetTable classes.
david
parents: 35210
diff changeset
   330
  _bot = _g1h->bot();
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   331
  _ct_bs = _g1h->g1_barrier_set();
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   332
}
d2c05216f375 8142390: Move ScanRSClosure to header file
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parents: 34135
diff changeset
   333
46635
ef7cac5de811 8179679: Rearrange filters before card scanning
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parents: 46625
diff changeset
   334
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
   335
  HeapRegion* const card_region = _g1h->region_at(region_idx_for_card);
ef7cac5de811 8179679: Rearrange filters before card scanning
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parents: 46625
diff changeset
   336
  _scan_objs_on_card_cl->set_region(card_region);
ef7cac5de811 8179679: Rearrange filters before card scanning
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parents: 46625
diff changeset
   337
  card_region->oops_on_card_seq_iterate_careful<true>(mr, _scan_objs_on_card_cl);
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parents: 46625
diff changeset
   338
  _cards_scanned++;
34246
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ehelin
parents: 34135
diff changeset
   339
}
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parents:
diff changeset
   340
46575
d6fb8a7a7843 8178151: Clean up G1RemSet files
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parents: 46572
diff changeset
   341
void G1ScanRSForRegionClosure::scan_strong_code_roots(HeapRegion* r) {
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   342
  double scan_start = os::elapsedTime();
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   343
  r->strong_code_roots_do(_code_root_cl);
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   344
  _strong_code_root_scan_time_sec += (os::elapsedTime() - scan_start);
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   345
}
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   346
46635
ef7cac5de811 8179679: Rearrange filters before card scanning
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diff changeset
   347
void G1ScanRSForRegionClosure::claim_card(size_t card_index, const uint region_idx_for_card){
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   348
  _ct_bs->set_card_claimed(card_index);
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   349
  _scan_state->add_dirty_region(region_idx_for_card);
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   350
}
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   351
46575
d6fb8a7a7843 8178151: Clean up G1RemSet files
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parents: 46572
diff changeset
   352
bool G1ScanRSForRegionClosure::doHeapRegion(HeapRegion* r) {
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   353
  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
   354
  uint region_idx = r->hrm_index();
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   355
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   356
  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
   357
    return false;
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   358
  }
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   359
  if (_scan_state->claim_iter(region_idx)) {
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   360
    // 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
   361
    // 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
   362
    // add regions of the collection set to the dirty cards region.
38154
4c30333c304e 8153507: Improve Card Table Clear Task
tschatzl
parents: 37988
diff changeset
   363
    _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
   364
  }
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   365
46575
d6fb8a7a7843 8178151: Clean up G1RemSet files
tschatzl
parents: 46572
diff changeset
   366
  // We claim cards in blocks so as to reduce the contention.
d6fb8a7a7843 8178151: Clean up G1RemSet files
tschatzl
parents: 46572
diff changeset
   367
  size_t const block_size = G1RSetScanBlockSize;
d6fb8a7a7843 8178151: Clean up G1RemSet files
tschatzl
parents: 46572
diff changeset
   368
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   369
  HeapRegionRemSetIterator iter(r->rem_set());
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   370
  size_t card_index;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   371
46575
d6fb8a7a7843 8178151: Clean up G1RemSet files
tschatzl
parents: 46572
diff changeset
   372
  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
   373
  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
   374
    if (current_card >= claimed_card_block + block_size) {
d6fb8a7a7843 8178151: Clean up G1RemSet files
tschatzl
parents: 46572
diff changeset
   375
      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
   376
    }
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   377
    if (current_card < claimed_card_block) {
46571
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   378
      _cards_skipped++;
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   379
      continue;
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   380
    }
46571
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   381
    _cards_claimed++;
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   382
46635
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   383
    // If the card is dirty, then G1 will scan it during Update RS.
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   384
    if (_ct_bs->is_card_claimed(card_index) || _ct_bs->is_card_dirty(card_index)) {
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   385
      continue;
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   386
    }
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
    HeapWord* const card_start = _g1h->bot()->address_for_index(card_index);
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   389
    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
   390
46635
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   391
    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
   392
           "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
   393
    HeapWord* const top = _scan_state->scan_top(region_idx_for_card);
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   394
    if (card_start >= top) {
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   395
      continue;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   396
    }
46635
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
    // 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
   399
    // 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
   400
    // Claim the card after checking bounds above: the remembered set may contain
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   401
    // random cards into current survivor, and we would then have an incorrectly
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   402
    // 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
   403
    // of survivor space regions.
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   404
    claim_card(card_index, region_idx_for_card);
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   405
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   406
    MemRegion const mr(card_start, MIN2(card_start + BOTConstants::N_words, top));
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   407
ef7cac5de811 8179679: Rearrange filters before card scanning
tschatzl
parents: 46625
diff changeset
   408
    scan_card(mr, region_idx_for_card);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   409
  }
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   410
  if (_scan_state->set_iter_complete(region_idx)) {
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   411
    // Scan the strong code root list attached to the current region
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   412
    scan_strong_code_roots(r);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   413
  }
34246
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   414
  return false;
d2c05216f375 8142390: Move ScanRSClosure to header file
ehelin
parents: 34135
diff changeset
   415
}
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   416
46572
fef0d64b2263 8175554: Improve G1UpdateRSOrPushRefClosure
tschatzl
parents: 46571
diff changeset
   417
void G1RemSet::scan_rem_set(G1ParScanThreadState* pss,
46571
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   418
                            CodeBlobClosure* heap_region_codeblobs,
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   419
                            uint worker_i) {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   420
  double rs_time_start = os::elapsedTime();
32617
a59435e1fecc 8135012: Don't use G1RootProcessor when scanning remembered sets
mgerdin
parents: 31592
diff changeset
   421
46572
fef0d64b2263 8175554: Improve G1UpdateRSOrPushRefClosure
tschatzl
parents: 46571
diff changeset
   422
  G1ScanObjsDuringScanRSClosure scan_cl(_g1, pss);
46575
d6fb8a7a7843 8178151: Clean up G1RemSet files
tschatzl
parents: 46572
diff changeset
   423
  G1ScanRSForRegionClosure cl(_scan_state, &scan_cl, heap_region_codeblobs, worker_i);
39698
4016de4e596b 8159978: Use an array to store the collection set regions instead of linking through regions
tschatzl
parents: 38172
diff changeset
   424
  _g1->collection_set_iterate_from(&cl, worker_i);
10670
4ea0e7d2ffbc 6484982: G1: process references during evacuation pauses
johnc
parents: 10000
diff changeset
   425
46571
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   426
  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
   427
                             cl.strong_code_root_scan_time_sec();
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   428
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   429
  G1GCPhaseTimes* p = _g1p->phase_times();
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   430
46571
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   431
  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
   432
  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
   433
  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
   434
  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
   435
46571
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   436
  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
   437
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   438
46670
55a3c36b64b2 8183539: Remove G1RemSet::_into_cset_dirty_card_queue_set
ehelin
parents: 46653
diff changeset
   439
// Closure used for updating rem sets. Only called during an evacuation pause.
46580
130fde4acb34 8183122: Rename RefineRecordRefsIntoCSCardTableEntryClosure to G1RefineCardClosure
ehelin
parents: 46575
diff changeset
   440
class G1RefineCardClosure: public CardTableEntryClosure {
6247
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   441
  G1RemSet* _g1rs;
46572
fef0d64b2263 8175554: Improve G1UpdateRSOrPushRefClosure
tschatzl
parents: 46571
diff changeset
   442
  G1ScanObjsDuringUpdateRSClosure* _update_rs_cl;
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   443
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   444
  size_t _cards_scanned;
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   445
  size_t _cards_skipped;
6247
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   446
public:
46670
55a3c36b64b2 8183539: Remove G1RemSet::_into_cset_dirty_card_queue_set
ehelin
parents: 46653
diff changeset
   447
  G1RefineCardClosure(G1CollectedHeap* g1h, G1ScanObjsDuringUpdateRSClosure* update_rs_cl) :
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   448
    _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
   449
  {}
33204
b8a3901ac5b3 8069330: Adjustment of concurrent refinement thresholds does not take hot card cache into account
tschatzl
parents: 33105
diff changeset
   450
23855
c4574075402c 8016302: Change type of the number of GC workers to unsigned int (2)
vkempik
parents: 23455
diff changeset
   451
  bool do_card_ptr(jbyte* card_ptr, uint worker_i) {
6247
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   452
    // The only time we care about recording cards that
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   453
    // contain references that point into the collection set
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   454
    // is during RSet updating within an evacuation pause.
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   455
    // 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
   456
    assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause");
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   457
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   458
    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
   459
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   460
    if (card_scanned) {
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   461
      _cards_scanned++;
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   462
    } else {
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   463
      _cards_skipped++;
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   464
    }
6247
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   465
    return true;
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   466
  }
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   467
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   468
  size_t cards_scanned() const { return _cards_scanned; }
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   469
  size_t cards_skipped() const { return _cards_skipped; }
6247
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   470
};
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   471
46670
55a3c36b64b2 8183539: Remove G1RemSet::_into_cset_dirty_card_queue_set
ehelin
parents: 46653
diff changeset
   472
void G1RemSet::update_rem_set(G1ParScanThreadState* pss, uint worker_i) {
46572
fef0d64b2263 8175554: Improve G1UpdateRSOrPushRefClosure
tschatzl
parents: 46571
diff changeset
   473
  G1ScanObjsDuringUpdateRSClosure update_rs_cl(_g1, pss, worker_i);
46670
55a3c36b64b2 8183539: Remove G1RemSet::_into_cset_dirty_card_queue_set
ehelin
parents: 46653
diff changeset
   474
  G1RefineCardClosure refine_card_cl(_g1, &update_rs_cl);
10670
4ea0e7d2ffbc 6484982: G1: process references during evacuation pauses
johnc
parents: 10000
diff changeset
   475
33204
b8a3901ac5b3 8069330: Adjustment of concurrent refinement thresholds does not take hot card cache into account
tschatzl
parents: 33105
diff changeset
   476
  G1GCParPhaseTimesTracker x(_g1p->phase_times(), G1GCPhaseTimes::UpdateRS, worker_i);
38172
90f405aac699 8155524: HotCardCache shouldn't be part of ConcurrentG1Refine
kbarrett
parents: 38160
diff changeset
   477
  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
   478
    // 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
   479
    G1GCParPhaseTimesTracker y(_g1p->phase_times(), G1GCPhaseTimes::ScanHCC, worker_i);
46580
130fde4acb34 8183122: Rename RefineRecordRefsIntoCSCardTableEntryClosure to G1RefineCardClosure
ehelin
parents: 46575
diff changeset
   480
    _g1->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
   481
  }
b8a3901ac5b3 8069330: Adjustment of concurrent refinement thresholds does not take hot card cache into account
tschatzl
parents: 33105
diff changeset
   482
  // Apply the closure to all remaining log entries.
46580
130fde4acb34 8183122: Rename RefineRecordRefsIntoCSCardTableEntryClosure to G1RefineCardClosure
ehelin
parents: 46575
diff changeset
   483
  _g1->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
   484
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   485
  G1GCPhaseTimes* p = _g1p->phase_times();
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   486
  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
   487
  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
   488
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   489
6958
cfa71cf3564d 6971296: G1: simplify G1RemSet class hierarchy
johnc
parents: 6759
diff changeset
   490
void G1RemSet::cleanupHRRS() {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   491
  HeapRegionRemSet::cleanup();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   492
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   493
46572
fef0d64b2263 8175554: Improve G1UpdateRSOrPushRefClosure
tschatzl
parents: 46571
diff changeset
   494
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
   495
                                           CodeBlobClosure* heap_region_codeblobs,
c70b36f0730d 8178148: Log more detailed information about scan rs phase
tschatzl
parents: 46520
diff changeset
   496
                                           uint worker_i) {
46670
55a3c36b64b2 8183539: Remove G1RemSet::_into_cset_dirty_card_queue_set
ehelin
parents: 46653
diff changeset
   497
  update_rem_set(pss, worker_i);
46572
fef0d64b2263 8175554: Improve G1UpdateRSOrPushRefClosure
tschatzl
parents: 46571
diff changeset
   498
  scan_rem_set(pss, heap_region_codeblobs, worker_i);;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   499
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   500
6958
cfa71cf3564d 6971296: G1: simplify G1RemSet class hierarchy
johnc
parents: 6759
diff changeset
   501
void G1RemSet::prepare_for_oops_into_collection_set_do() {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   502
  DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   503
  dcqs.concatenate_logs();
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   504
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   505
  _scan_state->reset();
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   506
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   507
6958
cfa71cf3564d 6971296: G1: simplify G1RemSet class hierarchy
johnc
parents: 6759
diff changeset
   508
void G1RemSet::cleanup_after_oops_into_collection_set_do() {
38154
4c30333c304e 8153507: Improve Card Table Clear Task
tschatzl
parents: 37988
diff changeset
   509
  G1GCPhaseTimes* phase_times = _g1->g1_policy()->phase_times();
4c30333c304e 8153507: Improve Card Table Clear Task
tschatzl
parents: 37988
diff changeset
   510
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   511
  // Set all cards back to clean.
38154
4c30333c304e 8153507: Improve Card Table Clear Task
tschatzl
parents: 37988
diff changeset
   512
  double start = os::elapsedTime();
4c30333c304e 8153507: Improve Card Table Clear Task
tschatzl
parents: 37988
diff changeset
   513
  _scan_state->clear_card_table(_g1->workers());
4c30333c304e 8153507: Improve Card Table Clear Task
tschatzl
parents: 37988
diff changeset
   514
  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
   515
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   516
37414
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   517
class G1ScrubRSClosure: public HeapRegionClosure {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   518
  G1CollectedHeap* _g1h;
37414
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   519
  G1CardLiveData* _live_data;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   520
public:
37414
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   521
  G1ScrubRSClosure(G1CardLiveData* live_data) :
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   522
    _g1h(G1CollectedHeap::heap()),
37414
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   523
    _live_data(live_data) { }
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   524
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   525
  bool doHeapRegion(HeapRegion* r) {
26846
7d4376f8560e 8058495: G1: normalize names for isHumongous() and friends
tonyp
parents: 26701
diff changeset
   526
    if (!r->is_continues_humongous()) {
37414
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   527
      r->rem_set()->scrub(_live_data);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   528
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   529
    return false;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   530
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   531
};
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   532
37414
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   533
void G1RemSet::scrub(uint worker_num, HeapRegionClaimer *hrclaimer) {
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   534
  G1ScrubRSClosure scrub_cl(&_card_live_data);
47885
5caa1d5f74c1 8186571: Implementation: JEP 307: Parallel Full GC for G1
sjohanss
parents: 47789
diff changeset
   535
  _g1->heap_region_par_iterate_from_worker_offset(&scrub_cl, hrclaimer, worker_num);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   536
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   537
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   538
inline void check_card_ptr(jbyte* card_ptr, CardTableModRefBS* ct_bs) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   539
#ifdef ASSERT
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   540
  G1CollectedHeap* g1 = G1CollectedHeap::heap();
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   541
  assert(g1->is_in_exact(ct_bs->addr_for(card_ptr)),
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   542
         "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
   543
         p2i(card_ptr),
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   544
         ct_bs->index_for(ct_bs->addr_for(card_ptr)),
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   545
         p2i(ct_bs->addr_for(card_ptr)),
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   546
         g1->addr_to_region(ct_bs->addr_for(card_ptr)));
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   547
#endif
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   548
}
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   549
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   550
void G1RemSet::refine_card_concurrently(jbyte* card_ptr,
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   551
                                        uint worker_i) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   552
  assert(!_g1->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
   553
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   554
  check_card_ptr(card_ptr, _ct_bs);
37988
bf4018edea5e 8153503: Move remset scan iteration claim to remset local data structure
tschatzl
parents: 37985
diff changeset
   555
17327
4bd0581aa231 7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents: 17108
diff changeset
   556
  // If the card is no longer dirty, nothing to do.
4bd0581aa231 7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents: 17108
diff changeset
   557
  if (*card_ptr != CardTableModRefBS::dirty_card_val()) {
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   558
    return;
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   559
  }
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   560
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   561
  // Construct the region representing the card.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   562
  HeapWord* start = _ct_bs->addr_for(card_ptr);
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   563
  // And find the region containing it.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   564
  HeapRegion* r = _g1->heap_region_containing(start);
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
  // 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
   567
  // ignore the card.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   568
  //
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   569
  // 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
   570
  // 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
   571
  // filter them out.  However, that marking is performed
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   572
  // 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
   573
  // 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
   574
  //
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   575
  // 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
   576
  // 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
   577
  // 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
   578
  // 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
   579
  // 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
   580
  // 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
   581
  //
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   582
  // 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
   583
  // 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
   584
  // 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
   585
  if (!r->is_old_or_humongous()) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   586
    return;
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
  // 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
   590
  //   * pointer to the current card
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   591
  //     (implying that the current card is not 'hot'),
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   592
  //   * null
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   593
  //     (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
   594
  //     which had some headroom),
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   595
  //   * 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
   596
  //
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   597
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   598
  if (_hot_card_cache->use_cache()) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   599
    assert(!SafepointSynchronize::is_at_safepoint(), "sanity");
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   600
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   601
    const jbyte* orig_card_ptr = card_ptr;
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   602
    card_ptr = _hot_card_cache->insert(card_ptr);
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   603
    if (card_ptr == NULL) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   604
      // There was no eviction. Nothing to do.
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
    } else if (card_ptr != orig_card_ptr) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   607
      // Original card was inserted and an old card was evicted.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   608
      start = _ct_bs->addr_for(card_ptr);
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   609
      r = _g1->heap_region_containing(start);
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   610
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   611
      // 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
   612
      // ignored, as discussed earlier for the original card.  The
48778
808555a54e9c 8196883: G1RemSet::refine_card_concurrently doesn't need to check for cards in collection set
tschatzl
parents: 48103
diff changeset
   613
      // 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
   614
      if (!r->is_old_or_humongous()) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   615
        return;
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   616
      }
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   617
    } // Else we still have the original card.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   618
  }
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   619
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   620
  // 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
   621
  // 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
   622
  // (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
   623
  // beyond the end of allocation.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   624
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   625
  // 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
   626
  // 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
   627
  // 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
   628
  // 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
   629
  // 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
   630
  // 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
   631
  // we see the up-to-date top here.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   632
  HeapWord* scan_limit = r->top();
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   633
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   634
  if (scan_limit <= start) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   635
    // 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
   636
    return;
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   637
  }
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   638
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   639
  // 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
   640
  // 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
   641
  // as iteration failure.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   642
  *const_cast<volatile jbyte*>(card_ptr) = CardTableModRefBS::clean_card_val();
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   643
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   644
  // 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
   645
  // 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
   646
  // 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
   647
  // 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
   648
  // 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
   649
  // both set, in any order, to proceed.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   650
  OrderAccess::fence();
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
  // 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
   653
  // a card beyond the heap.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   654
  HeapWord* end = start + CardTableModRefBS::card_size_in_words;
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   655
  MemRegion dirty_region(start, MIN2(scan_limit, end));
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   656
  assert(!dirty_region.is_empty(), "sanity");
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   657
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   658
  G1ConcurrentRefineOopClosure conc_refine_cl(_g1, worker_i);
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   659
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   660
  bool card_processed =
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   661
    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
   662
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   663
  // 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
   664
  // 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
   665
  // 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
   666
  // 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
   667
  // 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
   668
  if (!card_processed) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   669
    // 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
   670
    // worked.  (In fact, it's pretty likely.)
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   671
    if (*card_ptr != CardTableModRefBS::dirty_card_val()) {
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   672
      *card_ptr = CardTableModRefBS::dirty_card_val();
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   673
      MutexLockerEx x(Shared_DirtyCardQ_lock,
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   674
                      Mutex::_no_safepoint_check_flag);
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   675
      DirtyCardQueue* sdcq =
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   676
        JavaThread::dirty_card_queue_set().shared_dirty_card_queue();
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   677
      sdcq->enqueue(card_ptr);
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   678
    }
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   679
  } else {
46614
ae1105fff9e4 8179677: Let G1Remset::_conc_refined_cards only count number of cards concurrently refined
tschatzl
parents: 46611
diff changeset
   680
    _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
   681
  }
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   682
}
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   683
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   684
bool G1RemSet::refine_card_during_gc(jbyte* card_ptr,
46572
fef0d64b2263 8175554: Improve G1UpdateRSOrPushRefClosure
tschatzl
parents: 46571
diff changeset
   685
                                     G1ScanObjsDuringUpdateRSClosure* update_rs_cl) {
46519
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   686
  assert(_g1->is_gc_active(), "Only call during GC");
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   687
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   688
  check_card_ptr(card_ptr, _ct_bs);
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   689
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   690
  // 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
   691
  // scanned as parts of the remembered sets.
40c9c132f961 8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement
tschatzl
parents: 46518
diff changeset
   692
  if (*card_ptr != CardTableModRefBS::dirty_card_val()) {
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   693
    return false;
17327
4bd0581aa231 7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents: 17108
diff changeset
   694
  }
4bd0581aa231 7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents: 17108
diff changeset
   695
46676
dff06ff9effe 8183538: UpdateRS phase should claim cards
tschatzl
parents: 46670
diff changeset
   696
  // 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
   697
  // number of potential duplicate scans (multiple threads may enqueue the same card twice).
dff06ff9effe 8183538: UpdateRS phase should claim cards
tschatzl
parents: 46670
diff changeset
   698
  *card_ptr = CardTableModRefBS::clean_card_val() | CardTableModRefBS::claimed_card_val();
17327
4bd0581aa231 7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents: 17108
diff changeset
   699
46520
de5cb3eed39b 8177044: Remove _scan_top from HeapRegion
tschatzl
parents: 46519
diff changeset
   700
  // Construct the region representing the card.
de5cb3eed39b 8177044: Remove _scan_top from HeapRegion
tschatzl
parents: 46519
diff changeset
   701
  HeapWord* card_start = _ct_bs->addr_for(card_ptr);
de5cb3eed39b 8177044: Remove _scan_top from HeapRegion
tschatzl
parents: 46519
diff changeset
   702
  // And find the region containing it.
46676
dff06ff9effe 8183538: UpdateRS phase should claim cards
tschatzl
parents: 46670
diff changeset
   703
  uint const card_region_idx = _g1->addr_to_region(card_start);
46520
de5cb3eed39b 8177044: Remove _scan_top from HeapRegion
tschatzl
parents: 46519
diff changeset
   704
46676
dff06ff9effe 8183538: UpdateRS phase should claim cards
tschatzl
parents: 46670
diff changeset
   705
  _scan_state->add_dirty_region(card_region_idx);
dff06ff9effe 8183538: UpdateRS phase should claim cards
tschatzl
parents: 46670
diff changeset
   706
  HeapWord* scan_limit = _scan_state->scan_top(card_region_idx);
46520
de5cb3eed39b 8177044: Remove _scan_top from HeapRegion
tschatzl
parents: 46519
diff changeset
   707
  if (scan_limit <= card_start) {
de5cb3eed39b 8177044: Remove _scan_top from HeapRegion
tschatzl
parents: 46519
diff changeset
   708
    // 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
   709
    return false;
17327
4bd0581aa231 7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents: 17108
diff changeset
   710
  }
4bd0581aa231 7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
johnc
parents: 17108
diff changeset
   711
13728
882756847a04 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents: 13516
diff changeset
   712
  // 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
   713
  // a card beyond the heap.
46520
de5cb3eed39b 8177044: Remove _scan_top from HeapRegion
tschatzl
parents: 46519
diff changeset
   714
  HeapWord* card_end = card_start + CardTableModRefBS::card_size_in_words;
de5cb3eed39b 8177044: Remove _scan_top from HeapRegion
tschatzl
parents: 46519
diff changeset
   715
  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
   716
  assert(!dirty_region.is_empty(), "sanity");
3590
a268fa66d7fb 6819077: G1: first GC thread coming late into the GC.
johnc
parents: 3262
diff changeset
   717
46676
dff06ff9effe 8183538: UpdateRS phase should claim cards
tschatzl
parents: 46670
diff changeset
   718
  HeapRegion* const card_region = _g1->region_at(card_region_idx);
dff06ff9effe 8183538: UpdateRS phase should claim cards
tschatzl
parents: 46670
diff changeset
   719
  update_rs_cl->set_region(card_region);
dff06ff9effe 8183538: UpdateRS phase should claim cards
tschatzl
parents: 46670
diff changeset
   720
  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
   721
  assert(card_processed, "must be");
46778
f504c6f2eea5 8183121: Add information about scanned and skipped cards during UpdateRS
tschatzl
parents: 46701
diff changeset
   722
  return true;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   723
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   724
35061
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   725
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
   726
  if ((G1SummarizeRSetStatsPeriod > 0) && log_is_enabled(Trace, gc, remset) &&
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   727
      (period_count % G1SummarizeRSetStatsPeriod == 0)) {
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   728
46652
ab8716d193bb 8183226: Remembered set summarization accesses not fully initialized java thread DCQS
tschatzl
parents: 46635
diff changeset
   729
    G1RemSetSummary current(this);
35061
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   730
    _prev_period_summary.subtract_from(&current);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   731
37242
91e5f98fff6f 8152632: Rename LogHandle(...) to Log(...)
stefank
parents: 36374
diff changeset
   732
    Log(gc, remset) log;
35061
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   733
    log.trace("%s", header);
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   734
    ResourceMark rm;
46701
f559541c0daa 8181917: Refactor UL LogStreams to avoid using resource area
stuefe
parents: 46676
diff changeset
   735
    LogStream ls(log.trace());
f559541c0daa 8181917: Refactor UL LogStreams to avoid using resource area
stuefe
parents: 46676
diff changeset
   736
    _prev_period_summary.print_on(&ls);
35061
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   737
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   738
    _prev_period_summary.set(&current);
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   739
  }
17854
d65bc1546091 8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
parents: 17327
diff changeset
   740
}
2881
74a1337e4acc 6484957: G1: parallel concurrent refinement
iveresov
parents: 2741
diff changeset
   741
6958
cfa71cf3564d 6971296: G1: simplify G1RemSet class hierarchy
johnc
parents: 6759
diff changeset
   742
void G1RemSet::print_summary_info() {
37242
91e5f98fff6f 8152632: Rename LogHandle(...) to Log(...)
stefank
parents: 36374
diff changeset
   743
  Log(gc, remset, exit) log;
35061
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   744
  if (log.is_trace()) {
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   745
    log.trace(" Cumulative RS summary");
46653
d72083d17b19 8183128: Update RefineCardTableEntryClosure
tschatzl
parents: 46652
diff changeset
   746
    G1RemSetSummary current(this);
35061
be6025ebffea 8145092: Use Unified Logging for the GC logging
brutisso
parents: 34246
diff changeset
   747
    ResourceMark rm;
46701
f559541c0daa 8181917: Refactor UL LogStreams to avoid using resource area
stuefe
parents: 46676
diff changeset
   748
    LogStream ls(log.trace());
f559541c0daa 8181917: Refactor UL LogStreams to avoid using resource area
stuefe
parents: 46676
diff changeset
   749
    current.print_on(&ls);
17854
d65bc1546091 8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
tschatzl
parents: 17327
diff changeset
   750
  }
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   751
}
6247
00e5cc407d03 6814437: G1: remove the _new_refs array
johnc
parents: 6068
diff changeset
   752
37414
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   753
void G1RemSet::create_card_live_data(WorkGang* workers, G1CMBitMap* mark_bitmap) {
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   754
  _card_live_data.create(workers, mark_bitmap);
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   755
}
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   756
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   757
void G1RemSet::finalize_card_live_data(WorkGang* workers, G1CMBitMap* mark_bitmap) {
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   758
  _card_live_data.finalize(workers, mark_bitmap);
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   759
}
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   760
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   761
void G1RemSet::verify_card_live_data(WorkGang* workers, G1CMBitMap* bitmap) {
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   762
  _card_live_data.verify(workers, bitmap);
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   763
}
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   764
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   765
void G1RemSet::clear_card_live_data(WorkGang* workers) {
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   766
  _card_live_data.clear(workers);
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   767
}
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   768
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   769
#ifdef ASSERT
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   770
void G1RemSet::verify_card_live_data_is_clear() {
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   771
  _card_live_data.verify_is_clear();
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   772
}
2672ba9af0dc 8151386: Extract card live data out of G1ConcurrentMark
tschatzl
parents: 37248
diff changeset
   773
#endif