Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CardCounts.cpp @ 18041:52b4284cb496
Merge with jdk8u20-b26
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 16:02:50 +0200 |
| parents | 4ca6dc0799b6 78bbf4d43a14 |
| children | 7848fc12602b |
| 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 #include "precompiled.hpp" | |
| 26 #include "gc_implementation/g1/g1CardCounts.hpp" | |
| 27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 28 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
| 29 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" | |
| 30 #include "memory/cardTableModRefBS.hpp" | |
| 31 #include "services/memTracker.hpp" | |
| 32 #include "utilities/copy.hpp" | |
| 33 | |
|
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34 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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35 |
| 10246 | 36 void G1CardCounts::clear_range(size_t from_card_num, size_t to_card_num) { |
| 37 if (has_count_table()) { | |
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38 assert(from_card_num >= 0 && from_card_num < _committed_max_card_num, |
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39 err_msg("from card num out of range: "SIZE_FORMAT, from_card_num)); |
| 10246 | 40 assert(from_card_num < to_card_num, |
| 41 err_msg("Wrong order? from: " SIZE_FORMAT ", to: "SIZE_FORMAT, | |
| 42 from_card_num, to_card_num)); | |
| 43 assert(to_card_num <= _committed_max_card_num, | |
| 44 err_msg("to card num out of range: " | |
| 45 "to: "SIZE_FORMAT ", " | |
| 46 "max: "SIZE_FORMAT, | |
| 47 to_card_num, _committed_max_card_num)); | |
| 48 | |
| 49 to_card_num = MIN2(_committed_max_card_num, to_card_num); | |
| 50 | |
| 51 Copy::fill_to_bytes(&_card_counts[from_card_num], (to_card_num - from_card_num)); | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 G1CardCounts::G1CardCounts(G1CollectedHeap *g1h): | |
| 56 _g1h(g1h), _card_counts(NULL), | |
| 57 _reserved_max_card_num(0), _committed_max_card_num(0), | |
| 58 _committed_size(0) {} | |
| 59 | |
| 60 void G1CardCounts::initialize() { | |
| 61 assert(_g1h->max_capacity() > 0, "initialization order"); | |
| 62 assert(_g1h->capacity() == 0, "initialization order"); | |
| 63 | |
| 64 if (G1ConcRSHotCardLimit > 0) { | |
| 65 // The max value we can store in the counts table is | |
| 66 // max_jubyte. Guarantee the value of the hot | |
| 67 // threshold limit is no more than this. | |
| 68 guarantee(G1ConcRSHotCardLimit <= max_jubyte, "sanity"); | |
| 69 | |
| 12343 | 70 _ct_bs = _g1h->g1_barrier_set(); |
| 10246 | 71 _ct_bot = _ct_bs->byte_for_const(_g1h->reserved_region().start()); |
| 72 | |
| 73 // Allocate/Reserve the counts table | |
| 74 size_t reserved_bytes = _g1h->max_capacity(); | |
| 75 _reserved_max_card_num = reserved_bytes >> CardTableModRefBS::card_shift; | |
| 76 | |
| 77 size_t reserved_size = _reserved_max_card_num * sizeof(jbyte); | |
| 78 ReservedSpace rs(ReservedSpace::allocation_align_size_up(reserved_size)); | |
| 79 if (!rs.is_reserved()) { | |
| 80 warning("Could not reserve enough space for the card counts table"); | |
| 81 guarantee(!has_reserved_count_table(), "should be NULL"); | |
| 82 return; | |
| 83 } | |
| 84 | |
| 85 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); | |
| 86 | |
| 87 _card_counts_storage.initialize(rs, 0); | |
| 88 _card_counts = (jubyte*) _card_counts_storage.low(); | |
| 89 } | |
| 90 } | |
| 91 | |
| 92 void G1CardCounts::resize(size_t heap_capacity) { | |
| 93 // Expand the card counts table to handle a heap with the given capacity. | |
| 94 | |
| 95 if (!has_reserved_count_table()) { | |
| 96 // Don't expand if we failed to reserve the card counts table. | |
| 97 return; | |
| 98 } | |
| 99 | |
| 100 assert(_committed_size == | |
| 101 ReservedSpace::allocation_align_size_up(_committed_size), | |
| 102 err_msg("Unaligned? committed_size: " SIZE_FORMAT, _committed_size)); | |
| 103 | |
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104 // Verify that the committed space for the card counts matches our |
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105 // committed max card num. Note for some allocation alignments, the |
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106 // amount of space actually committed for the counts table will be able |
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107 // to span more cards than the number spanned by the maximum heap. |
| 10246 | 108 size_t prev_committed_size = _committed_size; |
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109 size_t prev_committed_card_num = committed_to_card_num(prev_committed_size); |
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110 |
| 10246 | 111 assert(prev_committed_card_num == _committed_max_card_num, |
| 112 err_msg("Card mismatch: " | |
| 113 "prev: " SIZE_FORMAT ", " | |
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114 "committed: "SIZE_FORMAT", " |
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115 "reserved: "SIZE_FORMAT, |
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116 prev_committed_card_num, _committed_max_card_num, _reserved_max_card_num)); |
| 10246 | 117 |
| 118 size_t new_size = (heap_capacity >> CardTableModRefBS::card_shift) * sizeof(jbyte); | |
| 119 size_t new_committed_size = ReservedSpace::allocation_align_size_up(new_size); | |
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120 size_t new_committed_card_num = committed_to_card_num(new_committed_size); |
| 10246 | 121 |
| 122 if (_committed_max_card_num < new_committed_card_num) { | |
| 123 // we need to expand the backing store for the card counts | |
| 124 size_t expand_size = new_committed_size - prev_committed_size; | |
| 125 | |
| 126 if (!_card_counts_storage.expand_by(expand_size)) { | |
| 127 warning("Card counts table backing store commit failure"); | |
| 128 return; | |
| 129 } | |
| 130 assert(_card_counts_storage.committed_size() == new_committed_size, | |
| 131 "expansion commit failure"); | |
| 132 | |
| 133 _committed_size = new_committed_size; | |
| 134 _committed_max_card_num = new_committed_card_num; | |
| 135 | |
| 136 clear_range(prev_committed_card_num, _committed_max_card_num); | |
| 137 } | |
| 138 } | |
| 139 | |
| 140 uint G1CardCounts::add_card_count(jbyte* card_ptr) { | |
| 141 // Returns the number of times the card has been refined. | |
| 142 // If we failed to reserve/commit the counts table, return 0. | |
| 143 // If card_ptr is beyond the committed end of the counts table, | |
| 144 // return 0. | |
| 145 // Otherwise return the actual count. | |
| 146 // Unless G1ConcRSHotCardLimit has been set appropriately, | |
| 147 // returning 0 will result in the card being considered | |
| 148 // cold and will be refined immediately. | |
| 149 uint count = 0; | |
| 150 if (has_count_table()) { | |
| 151 size_t card_num = ptr_2_card_num(card_ptr); | |
| 152 if (card_num < _committed_max_card_num) { | |
| 153 count = (uint) _card_counts[card_num]; | |
| 154 if (count < G1ConcRSHotCardLimit) { | |
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155 _card_counts[card_num] = |
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156 (jubyte)(MIN2((uintx)(_card_counts[card_num] + 1), G1ConcRSHotCardLimit)); |
| 10246 | 157 } |
| 158 } | |
| 159 } | |
| 160 return count; | |
| 161 } | |
| 162 | |
| 163 bool G1CardCounts::is_hot(uint count) { | |
| 164 return (count >= G1ConcRSHotCardLimit); | |
| 165 } | |
| 166 | |
| 167 void G1CardCounts::clear_region(HeapRegion* hr) { | |
| 168 assert(!hr->isHumongous(), "Should have been cleared"); | |
| 169 if (has_count_table()) { | |
| 170 HeapWord* bottom = hr->bottom(); | |
| 171 | |
| 172 // We use the last address in hr as hr could be the | |
| 173 // last region in the heap. In which case trying to find | |
| 174 // the card for hr->end() will be an OOB accesss to the | |
| 175 // card table. | |
| 176 HeapWord* last = hr->end() - 1; | |
| 177 assert(_g1h->g1_committed().contains(last), | |
| 178 err_msg("last not in committed: " | |
| 179 "last: " PTR_FORMAT ", " | |
| 180 "committed: [" PTR_FORMAT ", " PTR_FORMAT ")", | |
| 181 last, | |
| 182 _g1h->g1_committed().start(), | |
| 183 _g1h->g1_committed().end())); | |
| 184 | |
| 185 const jbyte* from_card_ptr = _ct_bs->byte_for_const(bottom); | |
| 186 const jbyte* last_card_ptr = _ct_bs->byte_for_const(last); | |
| 187 | |
| 188 #ifdef ASSERT | |
| 189 HeapWord* start_addr = _ct_bs->addr_for(from_card_ptr); | |
| 190 assert(start_addr == hr->bottom(), "alignment"); | |
| 191 HeapWord* last_addr = _ct_bs->addr_for(last_card_ptr); | |
| 192 assert((last_addr + CardTableModRefBS::card_size_in_words) == hr->end(), "alignment"); | |
| 193 #endif // ASSERT | |
| 194 | |
| 195 // Clear the counts for the (exclusive) card range. | |
| 196 size_t from_card_num = ptr_2_card_num(from_card_ptr); | |
| 197 size_t to_card_num = ptr_2_card_num(last_card_ptr) + 1; | |
| 198 clear_range(from_card_num, to_card_num); | |
| 199 } | |
| 200 } | |
| 201 | |
| 202 void G1CardCounts::clear_all() { | |
| 203 assert(SafepointSynchronize::is_at_safepoint(), "don't call this otherwise"); | |
| 204 clear_range((size_t)0, _committed_max_card_num); | |
| 205 } | |
| 206 | |
| 207 G1CardCounts::~G1CardCounts() { | |
| 208 if (has_reserved_count_table()) { | |
| 209 _card_counts_storage.release(); | |
| 210 } | |
| 211 } | |
| 212 |