Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CardCounts.hpp @ 20571:1d6eb209432a
8058568: GC cleanup phase can cause G1 skipping a System.gc()
Summary: Marking G1 FullGC as a _full collection and passing down the correct before count.
Reviewed-by: brutisso, mgerdin
| author | sjohanss |
|---|---|
| date | Mon, 20 Oct 2014 10:18:17 +0200 |
| parents | e7d0505c8a30 |
| children |
| rev | line source |
|---|---|
| 10246 | 1 /* |
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2 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved. |
| 10246 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP | |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP | |
| 27 | |
| 20337 | 28 #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp" |
| 10246 | 29 #include "memory/allocation.hpp" |
| 30 #include "runtime/virtualspace.hpp" | |
| 31 #include "utilities/globalDefinitions.hpp" | |
| 32 | |
| 33 class CardTableModRefBS; | |
| 20337 | 34 class G1CardCounts; |
| 10246 | 35 class G1CollectedHeap; |
| 20337 | 36 class G1RegionToSpaceMapper; |
| 10246 | 37 class HeapRegion; |
| 38 | |
| 20337 | 39 class G1CardCountsMappingChangedListener : public G1MappingChangedListener { |
| 40 private: | |
| 41 G1CardCounts* _counts; | |
| 42 public: | |
| 43 void set_cardcounts(G1CardCounts* counts) { _counts = counts; } | |
| 44 | |
| 20543 | 45 virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled); |
| 20337 | 46 }; |
| 47 | |
| 10246 | 48 // Table to track the number of times a card has been refined. Once |
| 49 // a card has been refined a certain number of times, it is | |
| 50 // considered 'hot' and its refinement is delayed by inserting the | |
| 51 // card into the hot card cache. The card will then be refined when | |
| 52 // it is evicted from the hot card cache, or when the hot card cache | |
| 53 // is 'drained' during the next evacuation pause. | |
| 54 | |
| 55 class G1CardCounts: public CHeapObj<mtGC> { | |
| 20337 | 56 G1CardCountsMappingChangedListener _listener; |
| 57 | |
| 10246 | 58 G1CollectedHeap* _g1h; |
| 59 | |
| 60 // The table of counts | |
| 61 jubyte* _card_counts; | |
| 62 | |
| 63 // Max capacity of the reserved space for the counts table | |
| 64 size_t _reserved_max_card_num; | |
| 65 | |
| 66 // CardTable bottom. | |
| 67 const jbyte* _ct_bot; | |
| 68 | |
| 69 // Barrier set | |
| 70 CardTableModRefBS* _ct_bs; | |
| 71 | |
| 72 // Returns true if the card counts table has been reserved. | |
| 73 bool has_reserved_count_table() { return _card_counts != NULL; } | |
| 74 | |
| 75 // Returns true if the card counts table has been reserved and committed. | |
| 76 bool has_count_table() { | |
| 20337 | 77 return has_reserved_count_table(); |
| 10246 | 78 } |
| 79 | |
| 80 size_t ptr_2_card_num(const jbyte* card_ptr) { | |
| 81 assert(card_ptr >= _ct_bot, | |
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82 err_msg("Invalid card pointer: " |
| 10246 | 83 "card_ptr: " PTR_FORMAT ", " |
| 84 "_ct_bot: " PTR_FORMAT, | |
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85 p2i(card_ptr), p2i(_ct_bot))); |
| 10246 | 86 size_t card_num = pointer_delta(card_ptr, _ct_bot, sizeof(jbyte)); |
| 20337 | 87 assert(card_num >= 0 && card_num < _reserved_max_card_num, |
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parents:
12241
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changeset
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88 err_msg("card pointer out of range: " PTR_FORMAT, p2i(card_ptr))); |
| 10246 | 89 return card_num; |
| 90 } | |
| 91 | |
| 92 jbyte* card_num_2_ptr(size_t card_num) { | |
| 20337 | 93 assert(card_num >= 0 && card_num < _reserved_max_card_num, |
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94 err_msg("card num out of range: "SIZE_FORMAT, card_num)); |
| 10246 | 95 return (jbyte*) (_ct_bot + card_num); |
| 96 } | |
| 97 | |
| 98 // Clear the counts table for the given (exclusive) index range. | |
| 99 void clear_range(size_t from_card_num, size_t to_card_num); | |
| 100 | |
| 101 public: | |
| 102 G1CardCounts(G1CollectedHeap* g1h); | |
| 103 | |
| 20337 | 104 void initialize(G1RegionToSpaceMapper* mapper); |
| 10246 | 105 |
| 106 // Increments the refinement count for the given card. | |
| 107 // Returns the pre-increment count value. | |
| 108 uint add_card_count(jbyte* card_ptr); | |
| 109 | |
| 110 // Returns true if the given count is high enough to be considered | |
| 111 // 'hot'; false otherwise. | |
| 112 bool is_hot(uint count); | |
| 113 | |
| 114 // Clears the card counts for the cards spanned by the region | |
| 115 void clear_region(HeapRegion* hr); | |
| 116 | |
| 20337 | 117 // Clears the card counts for the cards spanned by the MemRegion |
| 118 void clear_range(MemRegion mr); | |
| 119 | |
| 10246 | 120 // Clear the entire card counts table during GC. |
| 121 void clear_all(); | |
| 122 }; | |
| 123 | |
| 124 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP |