Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CardCounts.cpp @ 14909:4ca6dc0799b6
Backout jdk9 merge
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Tue, 01 Apr 2014 13:57:07 +0200 |
| parents | 63a4eb8bcd23 |
| children | 52b4284cb496 |
| rev | line source |
|---|---|
| 10246 | 1 /* |
| 2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. | |
| 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 | |
| 34 void G1CardCounts::clear_range(size_t from_card_num, size_t to_card_num) { | |
| 35 if (has_count_table()) { | |
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36 assert(from_card_num >= 0 && from_card_num < _committed_max_card_num, |
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37 err_msg("from card num out of range: "SIZE_FORMAT, from_card_num)); |
| 10246 | 38 assert(from_card_num < to_card_num, |
| 39 err_msg("Wrong order? from: " SIZE_FORMAT ", to: "SIZE_FORMAT, | |
| 40 from_card_num, to_card_num)); | |
| 41 assert(to_card_num <= _committed_max_card_num, | |
| 42 err_msg("to card num out of range: " | |
| 43 "to: "SIZE_FORMAT ", " | |
| 44 "max: "SIZE_FORMAT, | |
| 45 to_card_num, _committed_max_card_num)); | |
| 46 | |
| 47 to_card_num = MIN2(_committed_max_card_num, to_card_num); | |
| 48 | |
| 49 Copy::fill_to_bytes(&_card_counts[from_card_num], (to_card_num - from_card_num)); | |
| 50 } | |
| 51 } | |
| 52 | |
| 53 G1CardCounts::G1CardCounts(G1CollectedHeap *g1h): | |
| 54 _g1h(g1h), _card_counts(NULL), | |
| 55 _reserved_max_card_num(0), _committed_max_card_num(0), | |
| 56 _committed_size(0) {} | |
| 57 | |
| 58 void G1CardCounts::initialize() { | |
| 59 assert(_g1h->max_capacity() > 0, "initialization order"); | |
| 60 assert(_g1h->capacity() == 0, "initialization order"); | |
| 61 | |
| 62 if (G1ConcRSHotCardLimit > 0) { | |
| 63 // The max value we can store in the counts table is | |
| 64 // max_jubyte. Guarantee the value of the hot | |
| 65 // threshold limit is no more than this. | |
| 66 guarantee(G1ConcRSHotCardLimit <= max_jubyte, "sanity"); | |
| 67 | |
| 12343 | 68 _ct_bs = _g1h->g1_barrier_set(); |
| 10246 | 69 _ct_bot = _ct_bs->byte_for_const(_g1h->reserved_region().start()); |
| 70 | |
| 71 // Allocate/Reserve the counts table | |
| 72 size_t reserved_bytes = _g1h->max_capacity(); | |
| 73 _reserved_max_card_num = reserved_bytes >> CardTableModRefBS::card_shift; | |
| 74 | |
| 75 size_t reserved_size = _reserved_max_card_num * sizeof(jbyte); | |
| 76 ReservedSpace rs(ReservedSpace::allocation_align_size_up(reserved_size)); | |
| 77 if (!rs.is_reserved()) { | |
| 78 warning("Could not reserve enough space for the card counts table"); | |
| 79 guarantee(!has_reserved_count_table(), "should be NULL"); | |
| 80 return; | |
| 81 } | |
| 82 | |
| 83 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); | |
| 84 | |
| 85 _card_counts_storage.initialize(rs, 0); | |
| 86 _card_counts = (jubyte*) _card_counts_storage.low(); | |
| 87 } | |
| 88 } | |
| 89 | |
| 90 void G1CardCounts::resize(size_t heap_capacity) { | |
| 91 // Expand the card counts table to handle a heap with the given capacity. | |
| 92 | |
| 93 if (!has_reserved_count_table()) { | |
| 94 // Don't expand if we failed to reserve the card counts table. | |
| 95 return; | |
| 96 } | |
| 97 | |
| 98 assert(_committed_size == | |
| 99 ReservedSpace::allocation_align_size_up(_committed_size), | |
| 100 err_msg("Unaligned? committed_size: " SIZE_FORMAT, _committed_size)); | |
| 101 | |
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102 // Verify that the committed space for the card counts matches our |
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103 // committed max card num. Note for some allocation alignments, the |
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104 // amount of space actually committed for the counts table will be able |
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105 // to span more cards than the number spanned by the maximum heap. |
| 10246 | 106 size_t prev_committed_size = _committed_size; |
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107 size_t prev_committed_card_num = committed_to_card_num(prev_committed_size); |
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108 |
| 10246 | 109 assert(prev_committed_card_num == _committed_max_card_num, |
| 110 err_msg("Card mismatch: " | |
| 111 "prev: " SIZE_FORMAT ", " | |
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112 "committed: "SIZE_FORMAT", " |
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113 "reserved: "SIZE_FORMAT, |
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114 prev_committed_card_num, _committed_max_card_num, _reserved_max_card_num)); |
| 10246 | 115 |
| 116 size_t new_size = (heap_capacity >> CardTableModRefBS::card_shift) * sizeof(jbyte); | |
| 117 size_t new_committed_size = ReservedSpace::allocation_align_size_up(new_size); | |
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118 size_t new_committed_card_num = committed_to_card_num(new_committed_size); |
| 10246 | 119 |
| 120 if (_committed_max_card_num < new_committed_card_num) { | |
| 121 // we need to expand the backing store for the card counts | |
| 122 size_t expand_size = new_committed_size - prev_committed_size; | |
| 123 | |
| 124 if (!_card_counts_storage.expand_by(expand_size)) { | |
| 125 warning("Card counts table backing store commit failure"); | |
| 126 return; | |
| 127 } | |
| 128 assert(_card_counts_storage.committed_size() == new_committed_size, | |
| 129 "expansion commit failure"); | |
| 130 | |
| 131 _committed_size = new_committed_size; | |
| 132 _committed_max_card_num = new_committed_card_num; | |
| 133 | |
| 134 clear_range(prev_committed_card_num, _committed_max_card_num); | |
| 135 } | |
| 136 } | |
| 137 | |
| 138 uint G1CardCounts::add_card_count(jbyte* card_ptr) { | |
| 139 // Returns the number of times the card has been refined. | |
| 140 // If we failed to reserve/commit the counts table, return 0. | |
| 141 // If card_ptr is beyond the committed end of the counts table, | |
| 142 // return 0. | |
| 143 // Otherwise return the actual count. | |
| 144 // Unless G1ConcRSHotCardLimit has been set appropriately, | |
| 145 // returning 0 will result in the card being considered | |
| 146 // cold and will be refined immediately. | |
| 147 uint count = 0; | |
| 148 if (has_count_table()) { | |
| 149 size_t card_num = ptr_2_card_num(card_ptr); | |
| 150 if (card_num < _committed_max_card_num) { | |
| 151 count = (uint) _card_counts[card_num]; | |
| 152 if (count < G1ConcRSHotCardLimit) { | |
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153 _card_counts[card_num] = |
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154 (jubyte)(MIN2((uintx)(_card_counts[card_num] + 1), G1ConcRSHotCardLimit)); |
| 10246 | 155 } |
| 156 } | |
| 157 } | |
| 158 return count; | |
| 159 } | |
| 160 | |
| 161 bool G1CardCounts::is_hot(uint count) { | |
| 162 return (count >= G1ConcRSHotCardLimit); | |
| 163 } | |
| 164 | |
| 165 void G1CardCounts::clear_region(HeapRegion* hr) { | |
| 166 assert(!hr->isHumongous(), "Should have been cleared"); | |
| 167 if (has_count_table()) { | |
| 168 HeapWord* bottom = hr->bottom(); | |
| 169 | |
| 170 // We use the last address in hr as hr could be the | |
| 171 // last region in the heap. In which case trying to find | |
| 14909 | 172 // the card for hr->end() will be an OOB accesss to the |
| 10246 | 173 // card table. |
| 174 HeapWord* last = hr->end() - 1; | |
| 175 assert(_g1h->g1_committed().contains(last), | |
| 176 err_msg("last not in committed: " | |
| 177 "last: " PTR_FORMAT ", " | |
| 178 "committed: [" PTR_FORMAT ", " PTR_FORMAT ")", | |
| 179 last, | |
| 180 _g1h->g1_committed().start(), | |
| 181 _g1h->g1_committed().end())); | |
| 182 | |
| 183 const jbyte* from_card_ptr = _ct_bs->byte_for_const(bottom); | |
| 184 const jbyte* last_card_ptr = _ct_bs->byte_for_const(last); | |
| 185 | |
| 186 #ifdef ASSERT | |
| 187 HeapWord* start_addr = _ct_bs->addr_for(from_card_ptr); | |
| 188 assert(start_addr == hr->bottom(), "alignment"); | |
| 189 HeapWord* last_addr = _ct_bs->addr_for(last_card_ptr); | |
| 190 assert((last_addr + CardTableModRefBS::card_size_in_words) == hr->end(), "alignment"); | |
| 191 #endif // ASSERT | |
| 192 | |
| 193 // Clear the counts for the (exclusive) card range. | |
| 194 size_t from_card_num = ptr_2_card_num(from_card_ptr); | |
| 195 size_t to_card_num = ptr_2_card_num(last_card_ptr) + 1; | |
| 196 clear_range(from_card_num, to_card_num); | |
| 197 } | |
| 198 } | |
| 199 | |
| 200 void G1CardCounts::clear_all() { | |
| 201 assert(SafepointSynchronize::is_at_safepoint(), "don't call this otherwise"); | |
| 202 clear_range((size_t)0, _committed_max_card_num); | |
| 203 } | |
| 204 | |
| 205 G1CardCounts::~G1CardCounts() { | |
| 206 if (has_reserved_count_table()) { | |
| 207 _card_counts_storage.release(); | |
| 208 } | |
| 209 } | |
| 210 |