hotspot/src/share/vm/gc_implementation/g1/g1CardCounts.hpp
author johnc
Wed, 15 May 2013 22:35:36 -0700
changeset 17394 156f30e1d09a
parent 17327 4bd0581aa231
child 19994 ca520adcee02
permissions -rw-r--r--
8014408: G1: crashes with assert assert(prev_committed_card_num == _committed_max_card_num) failed Summary: Mismatch in the card number calculation between next and previous committed sizes of the card counts table. Reviewed-by: jmasa, tschatzl
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/*
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 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP
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#define SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP
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#include "memory/allocation.hpp"
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#include "runtime/virtualspace.hpp"
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#include "utilities/globalDefinitions.hpp"
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class CardTableModRefBS;
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class G1CollectedHeap;
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class HeapRegion;
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// Table to track the number of times a card has been refined. Once
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// a card has been refined a certain number of times, it is
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// considered 'hot' and its refinement is delayed by inserting the
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// card into the hot card cache. The card will then be refined when
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// it is evicted from the hot card cache, or when the hot card cache
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// is 'drained' during the next evacuation pause.
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class G1CardCounts: public CHeapObj<mtGC> {
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  G1CollectedHeap* _g1h;
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  // The table of counts
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  jubyte* _card_counts;
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  // Max capacity of the reserved space for the counts table
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  size_t _reserved_max_card_num;
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  // Max capacity of the committed space for the counts table
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  size_t _committed_max_card_num;
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  // Size of committed space for the counts table
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  size_t _committed_size;
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  // CardTable bottom.
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  const jbyte* _ct_bot;
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  // Barrier set
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  CardTableModRefBS* _ct_bs;
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  // The virtual memory backing the counts table
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  VirtualSpace _card_counts_storage;
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  // Returns true if the card counts table has been reserved.
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  bool has_reserved_count_table() { return _card_counts != NULL; }
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  // Returns true if the card counts table has been reserved and committed.
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  bool has_count_table() {
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    return has_reserved_count_table() && _committed_max_card_num > 0;
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  }
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  void check_card_num(size_t card_num, const char* msg) {
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    assert(card_num >= 0 && card_num < _committed_max_card_num, msg);
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  }
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  size_t ptr_2_card_num(const jbyte* card_ptr) {
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    assert(card_ptr >= _ct_bot,
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           err_msg("Inavalied card pointer: "
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                   "card_ptr: " PTR_FORMAT ", "
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                   "_ct_bot: " PTR_FORMAT,
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                   card_ptr, _ct_bot));
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    size_t card_num = pointer_delta(card_ptr, _ct_bot, sizeof(jbyte));
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    check_card_num(card_num,
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                   err_msg("card pointer out of range: " PTR_FORMAT, card_ptr));
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    return card_num;
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  }
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  jbyte* card_num_2_ptr(size_t card_num) {
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    check_card_num(card_num,
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                   err_msg("card num out of range: "SIZE_FORMAT, card_num));
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    return (jbyte*) (_ct_bot + card_num);
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  }
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  // Helper routine.
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  // Returns the number of cards that can be counted by the given committed
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  // table size, with a maximum of the number of cards spanned by the max
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  // capacity of the heap.
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  size_t committed_to_card_num(size_t committed_size) {
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    return MIN2(_reserved_max_card_num, committed_size / sizeof(jbyte));
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  }
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  // Clear the counts table for the given (exclusive) index range.
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  void clear_range(size_t from_card_num, size_t to_card_num);
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 public:
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  G1CardCounts(G1CollectedHeap* g1h);
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  ~G1CardCounts();
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  void initialize();
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  // Resize the committed space for the card counts table in
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  // response to a resize of the committed space for the heap.
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  void resize(size_t heap_capacity);
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  // Increments the refinement count for the given card.
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  // Returns the pre-increment count value.
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  uint add_card_count(jbyte* card_ptr);
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  // Returns true if the given count is high enough to be considered
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  // 'hot'; false otherwise.
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  bool is_hot(uint count);
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  // Clears the card counts for the cards spanned by the region
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  void clear_region(HeapRegion* hr);
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  // Clear the entire card counts table during GC.
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  // Updates the policy stats with the duration.
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  void clear_all();
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};
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP