annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.hpp @ 6198:24b9c7f4cae6

Merge
author coleenp
date Mon, 02 Jul 2012 13:11:28 -0400
parents 7994a5a35fcf d2a62e0f25eb
children db823a892a55
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1 /*
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP
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27
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28 #include "gc_implementation/g1/sparsePRT.hpp"
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29
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30 // Remembered set for a heap region. Represent a set of "cards" that
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31 // contain pointers into the owner heap region. Cards are defined somewhat
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32 // abstractly, in terms of what the "BlockOffsetTable" in use can parse.
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33
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34 class G1CollectedHeap;
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35 class G1BlockOffsetSharedArray;
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36 class HeapRegion;
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37 class HeapRegionRemSetIterator;
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38 class PerRegionTable;
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39 class SparsePRT;
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40
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41 // Essentially a wrapper around SparsePRTCleanupTask. See
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42 // sparsePRT.hpp for more details.
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43 class HRRSCleanupTask : public SparsePRTCleanupTask {
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44 };
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45
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46 // The "_coarse_map" is a bitmap with one bit for each region, where set
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47 // bits indicate that the corresponding region may contain some pointer
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48 // into the owning region.
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49
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50 // The "_fine_grain_entries" array is an open hash table of PerRegionTables
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51 // (PRTs), indicating regions for which we're keeping the RS as a set of
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52 // cards. The strategy is to cap the size of the fine-grain table,
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53 // deleting an entry and setting the corresponding coarse-grained bit when
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54 // we would overflow this cap.
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55
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56 // We use a mixture of locking and lock-free techniques here. We allow
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57 // threads to locate PRTs without locking, but threads attempting to alter
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58 // a bucket list obtain a lock. This means that any failing attempt to
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59 // find a PRT must be retried with the lock. It might seem dangerous that
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60 // a read can find a PRT that is concurrently deleted. This is all right,
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61 // because:
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62 //
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63 // 1) We only actually free PRT's at safe points (though we reuse them at
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64 // other times).
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65 // 2) We find PRT's in an attempt to add entries. If a PRT is deleted,
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66 // it's _coarse_map bit is set, so the that we were attempting to add
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67 // is represented. If a deleted PRT is re-used, a thread adding a bit,
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68 // thinking the PRT is for a different region, does no harm.
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69
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70 class OtherRegionsTable VALUE_OBJ_CLASS_SPEC {
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71 friend class HeapRegionRemSetIterator;
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72
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73 G1CollectedHeap* _g1h;
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74 Mutex _m;
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75 HeapRegion* _hr;
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76
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77 // These are protected by "_m".
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78 BitMap _coarse_map;
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79 size_t _n_coarse_entries;
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80 static jint _n_coarsenings;
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81
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82 PerRegionTable** _fine_grain_regions;
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83 size_t _n_fine_entries;
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84
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85 // Used to sample a subset of the fine grain PRTs to determine which
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86 // PRT to evict and coarsen.
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87 size_t _fine_eviction_start;
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88 static size_t _fine_eviction_stride;
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89 static size_t _fine_eviction_sample_size;
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90
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91 SparsePRT _sparse_table;
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92
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93 // These are static after init.
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94 static size_t _max_fine_entries;
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95 static size_t _mod_max_fine_entries_mask;
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96
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97 // Requires "prt" to be the first element of the bucket list appropriate
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98 // for "hr". If this list contains an entry for "hr", return it,
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99 // otherwise return "NULL".
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100 PerRegionTable* find_region_table(size_t ind, HeapRegion* hr) const;
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101
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102 // Find, delete, and return a candidate PerRegionTable, if any exists,
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103 // adding the deleted region to the coarse bitmap. Requires the caller
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104 // to hold _m, and the fine-grain table to be full.
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105 PerRegionTable* delete_region_table();
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106
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107 // If a PRT for "hr" is in the bucket list indicated by "ind" (which must
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108 // be the correct index for "hr"), delete it and return true; else return
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109 // false.
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110 bool del_single_region_table(size_t ind, HeapRegion* hr);
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111
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112 // Indexed by thread X heap region, to minimize thread contention.
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113 static int** _from_card_cache;
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114 static size_t _from_card_cache_max_regions;
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115 static size_t _from_card_cache_mem_size;
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116
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117 public:
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118 OtherRegionsTable(HeapRegion* hr);
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119
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120 HeapRegion* hr() const { return _hr; }
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121
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122 // For now. Could "expand" some tables in the future, so that this made
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123 // sense.
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124 void add_reference(OopOrNarrowOopStar from, int tid);
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125
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126 // Removes any entries shown by the given bitmaps to contain only dead
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127 // objects.
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128 void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm);
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129
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130 // Not const because it takes a lock.
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131 size_t occupied() const;
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132 size_t occ_fine() const;
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133 size_t occ_coarse() const;
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134 size_t occ_sparse() const;
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135
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136 static jint n_coarsenings() { return _n_coarsenings; }
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137
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138 // Returns size in bytes.
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139 // Not const because it takes a lock.
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140 size_t mem_size() const;
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141 static size_t static_mem_size();
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142 static size_t fl_mem_size();
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143
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144 bool contains_reference(OopOrNarrowOopStar from) const;
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145 bool contains_reference_locked(OopOrNarrowOopStar from) const;
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146
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147 void clear();
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148
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149 // Specifically clear the from_card_cache.
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150 void clear_fcc();
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151
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152 // "from_hr" is being cleared; remove any entries from it.
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153 void clear_incoming_entry(HeapRegion* from_hr);
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154
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155 void do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task);
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156
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157 // Declare the heap size (in # of regions) to the OtherRegionsTable.
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158 // (Uses it to initialize from_card_cache).
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159 static void init_from_card_cache(size_t max_regions);
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160
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161 // Declares that only regions i s.t. 0 <= i < new_n_regs are in use.
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162 // Make sure any entries for higher regions are invalid.
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163 static void shrink_from_card_cache(size_t new_n_regs);
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164
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165 static void print_from_card_cache();
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166 };
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167
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168 class HeapRegionRemSet : public CHeapObj<mtGC> {
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169 friend class VMStructs;
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170 friend class HeapRegionRemSetIterator;
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171
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172 public:
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173 enum Event {
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174 Event_EvacStart, Event_EvacEnd, Event_RSUpdateEnd
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175 };
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176
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177 private:
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178 G1BlockOffsetSharedArray* _bosa;
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179 G1BlockOffsetSharedArray* bosa() const { return _bosa; }
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180
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181 OtherRegionsTable _other_regions;
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182
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183 enum ParIterState { Unclaimed, Claimed, Complete };
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184 volatile ParIterState _iter_state;
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185 volatile jlong _iter_claimed;
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186
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187 // Unused unless G1RecordHRRSOops is true.
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188
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189 static const int MaxRecorded = 1000000;
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190 static OopOrNarrowOopStar* _recorded_oops;
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191 static HeapWord** _recorded_cards;
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192 static HeapRegion** _recorded_regions;
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193 static int _n_recorded;
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194
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195 static const int MaxRecordedEvents = 1000;
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196 static Event* _recorded_events;
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197 static int* _recorded_event_index;
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198 static int _n_recorded_events;
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199
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200 static void print_event(outputStream* str, Event evnt);
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201
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202 public:
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203 HeapRegionRemSet(G1BlockOffsetSharedArray* bosa,
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204 HeapRegion* hr);
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205
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206 static int num_par_rem_sets();
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207 static void setup_remset_size();
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208
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209 HeapRegion* hr() const {
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210 return _other_regions.hr();
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211 }
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212
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213 size_t occupied() const {
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214 return _other_regions.occupied();
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215 }
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216 size_t occ_fine() const {
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217 return _other_regions.occ_fine();
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218 }
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219 size_t occ_coarse() const {
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220 return _other_regions.occ_coarse();
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221 }
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222 size_t occ_sparse() const {
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223 return _other_regions.occ_sparse();
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224 }
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225
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226 static jint n_coarsenings() { return OtherRegionsTable::n_coarsenings(); }
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227
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228 // Used in the sequential case.
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229 void add_reference(OopOrNarrowOopStar from) {
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230 _other_regions.add_reference(from, 0);
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231 }
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232
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233 // Used in the parallel case.
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234 void add_reference(OopOrNarrowOopStar from, int tid) {
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235 _other_regions.add_reference(from, tid);
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236 }
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237
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238 // Removes any entries shown by the given bitmaps to contain only dead
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239 // objects.
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240 void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm);
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241
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242 // The region is being reclaimed; clear its remset, and any mention of
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243 // entries for this region in other remsets.
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244 void clear();
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245
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246 // Attempt to claim the region. Returns true iff this call caused an
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247 // atomic transition from Unclaimed to Claimed.
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248 bool claim_iter();
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249 // Sets the iteration state to "complete".
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250 void set_iter_complete();
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251 // Returns "true" iff the region's iteration is complete.
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252 bool iter_is_complete();
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253
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254 // Support for claiming blocks of cards during iteration
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255 size_t iter_claimed() const { return (size_t)_iter_claimed; }
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256 // Claim the next block of cards
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257 size_t iter_claimed_next(size_t step) {
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258 size_t current, next;
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259 do {
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260 current = iter_claimed();
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261 next = current + step;
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262 } while (Atomic::cmpxchg((jlong)next, &_iter_claimed, (jlong)current) != (jlong)current);
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263 return current;
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264 }
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265 void reset_for_par_iteration();
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266
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267 bool verify_ready_for_par_iteration() {
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268 return (_iter_state == Unclaimed) && (_iter_claimed == 0);
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269 }
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270
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271 // Initialize the given iterator to iterate over this rem set.
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272 void init_iterator(HeapRegionRemSetIterator* iter) const;
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273
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274 // The actual # of bytes this hr_remset takes up.
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275 size_t mem_size() {
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276 return _other_regions.mem_size()
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277 // This correction is necessary because the above includes the second
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278 // part.
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279 + sizeof(this) - sizeof(OtherRegionsTable);
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280 }
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281
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282 // Returns the memory occupancy of all static data structures associated
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283 // with remembered sets.
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284 static size_t static_mem_size() {
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285 return OtherRegionsTable::static_mem_size();
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286 }
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287
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288 // Returns the memory occupancy of all free_list data structures associated
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289 // with remembered sets.
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290 static size_t fl_mem_size() {
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291 return OtherRegionsTable::fl_mem_size();
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292 }
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293
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294 bool contains_reference(OopOrNarrowOopStar from) const {
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295 return _other_regions.contains_reference(from);
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296 }
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297 void print() const;
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298
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299 // Called during a stop-world phase to perform any deferred cleanups.
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300 static void cleanup();
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301
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302 // Declare the heap size (in # of regions) to the HeapRegionRemSet(s).
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303 // (Uses it to initialize from_card_cache).
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304 static void init_heap(uint max_regions) {
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305 OtherRegionsTable::init_from_card_cache((size_t) max_regions);
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306 }
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307
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308 // Declares that only regions i s.t. 0 <= i < new_n_regs are in use.
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309 static void shrink_heap(uint new_n_regs) {
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310 OtherRegionsTable::shrink_from_card_cache((size_t) new_n_regs);
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311 }
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312
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313 #ifndef PRODUCT
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314 static void print_from_card_cache() {
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315 OtherRegionsTable::print_from_card_cache();
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316 }
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317 #endif
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318
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319 static void record(HeapRegion* hr, OopOrNarrowOopStar f);
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320 static void print_recorded();
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321 static void record_event(Event evnt);
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322
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323 // These are wrappers for the similarly-named methods on
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324 // SparsePRT. Look at sparsePRT.hpp for more details.
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325 static void reset_for_cleanup_tasks();
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326 void do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task);
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327 static void finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task);
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328
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329 // Run unit tests.
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330 #ifndef PRODUCT
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331 static void test();
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332 #endif
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333 };
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334
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335 class HeapRegionRemSetIterator : public CHeapObj<mtGC> {
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336
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337 // The region over which we're iterating.
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338 const HeapRegionRemSet* _hrrs;
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339
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340 // Local caching of HRRS fields.
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341 const BitMap* _coarse_map;
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342 PerRegionTable** _fine_grain_regions;
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343
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344 G1BlockOffsetSharedArray* _bosa;
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345 G1CollectedHeap* _g1h;
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346
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347 // The number yielded since initialization.
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348 size_t _n_yielded_fine;
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349 size_t _n_yielded_coarse;
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350 size_t _n_yielded_sparse;
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351
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352 // If true we're iterating over the coarse table; if false the fine
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353 // table.
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354 enum IterState {
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355 Sparse,
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356 Fine,
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357 Coarse
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358 };
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359 IterState _is;
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360
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361 // In both kinds of iteration, heap offset of first card of current
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362 // region.
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363 size_t _cur_region_card_offset;
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364 // Card offset within cur region.
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365 size_t _cur_region_cur_card;
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366
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367 // Coarse table iteration fields:
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368
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369 // Current region index;
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370 int _coarse_cur_region_index;
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371 size_t _coarse_cur_region_cur_card;
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372
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373 bool coarse_has_next(size_t& card_index);
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374
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375 // Fine table iteration fields:
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376
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377 // Index of bucket-list we're working on.
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378 int _fine_array_index;
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379
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380 // Per Region Table we're doing within current bucket list.
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381 PerRegionTable* _fine_cur_prt;
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382
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383 /* SparsePRT::*/ SparsePRTIter _sparse_iter;
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384
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385 void fine_find_next_non_null_prt();
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386
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387 bool fine_has_next();
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388 bool fine_has_next(size_t& card_index);
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389
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390 public:
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391 // We require an iterator to be initialized before use, so the
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392 // constructor does little.
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393 HeapRegionRemSetIterator();
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394
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395 void initialize(const HeapRegionRemSet* hrrs);
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396
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397 // If there remains one or more cards to be yielded, returns true and
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398 // sets "card_index" to one of those cards (which is then considered
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399 // yielded.) Otherwise, returns false (and leaves "card_index"
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400 // undefined.)
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401 bool has_next(size_t& card_index);
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402
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403 size_t n_yielded_fine() { return _n_yielded_fine; }
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404 size_t n_yielded_coarse() { return _n_yielded_coarse; }
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405 size_t n_yielded_sparse() { return _n_yielded_sparse; }
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406 size_t n_yielded() {
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407 return n_yielded_fine() + n_yielded_coarse() + n_yielded_sparse();
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408 }
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409 };
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410
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411 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP