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annotate src/share/vm/gc_implementation/g1/g1RemSet.hpp @ 912:308762b2bf14

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6872000: G1: compilation fails on linux/older gcc Reviewed-by: jcoomes, tonyp
author apetrusenko
date Fri, 14 Aug 2009 13:44:15 -0700
parents 6cb8e9df7174
children c18cbe5936b8
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1 /*
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2 * Copyright 2001-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // A G1RemSet provides ways of iterating over pointers into a selected
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26 // collection set.
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27
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28 class G1CollectedHeap;
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29 class CardTableModRefBarrierSet;
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30 class HRInto_G1RemSet;
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31 class ConcurrentG1Refine;
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32
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33 class G1RemSet: public CHeapObj {
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34 protected:
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35 G1CollectedHeap* _g1;
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36 unsigned _conc_refine_cards;
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37 size_t n_workers();
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38
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39 public:
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40 G1RemSet(G1CollectedHeap* g1) :
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41 _g1(g1), _conc_refine_cards(0)
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42 {}
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43
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44 // Invoke "blk->do_oop" on all pointers into the CS in object in regions
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45 // outside the CS (having invoked "blk->set_region" to set the "from"
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46 // region correctly beforehand.) The "worker_i" param is for the
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47 // parallel case where the number of the worker thread calling this
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48 // function can be helpful in partitioning the work to be done. It
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49 // should be the same as the "i" passed to the calling thread's
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50 // work(i) function. In the sequential case this param will be ingored.
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51 virtual void oops_into_collection_set_do(OopsInHeapRegionClosure* blk,
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52 int worker_i) = 0;
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53
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54 // Prepare for and cleanup after an oops_into_collection_set_do
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55 // call. Must call each of these once before and after (in sequential
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56 // code) any threads call oops into collection set do. (This offers an
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57 // opportunity to sequential setup and teardown of structures needed by a
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58 // parallel iteration over the CS's RS.)
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59 virtual void prepare_for_oops_into_collection_set_do() = 0;
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60 virtual void cleanup_after_oops_into_collection_set_do() = 0;
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61
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62 // If "this" is of the given subtype, return "this", else "NULL".
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63 virtual HRInto_G1RemSet* as_HRInto_G1RemSet() { return NULL; }
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64
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65 // Record, if necessary, the fact that *p (where "p" is in region "from",
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66 // and is, a fortiori, required to be non-NULL) has changed to its new value.
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67 virtual void write_ref(HeapRegion* from, oop* p) = 0;
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68 virtual void write_ref(HeapRegion* from, narrowOop* p) = 0;
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69 virtual void par_write_ref(HeapRegion* from, oop* p, int tid) = 0;
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70 virtual void par_write_ref(HeapRegion* from, narrowOop* p, int tid) = 0;
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71
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72 // Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region
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73 // or card, respectively, such that a region or card with a corresponding
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74 // 0 bit contains no part of any live object. Eliminates any remembered
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75 // set entries that correspond to dead heap ranges.
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76 virtual void scrub(BitMap* region_bm, BitMap* card_bm) = 0;
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77 // Like the above, but assumes is called in parallel: "worker_num" is the
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78 // parallel thread id of the current thread, and "claim_val" is the
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79 // value that should be used to claim heap regions.
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80 virtual void scrub_par(BitMap* region_bm, BitMap* card_bm,
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81 int worker_num, int claim_val) = 0;
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82
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83 // Refine the card corresponding to "card_ptr". If "sts" is non-NULL,
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84 // join and leave around parts that must be atomic wrt GC. (NULL means
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85 // being done at a safepoint.)
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86 virtual void concurrentRefineOneCard(jbyte* card_ptr, int worker_i) {}
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87
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88 // Print any relevant summary info.
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89 virtual void print_summary_info() {}
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90
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91 // Prepare remebered set for verification.
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92 virtual void prepare_for_verify() {};
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93 };
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94
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95
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96 // The simplest possible G1RemSet: iterates over all objects in non-CS
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97 // regions, searching for pointers into the CS.
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98 class StupidG1RemSet: public G1RemSet {
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99 public:
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100 StupidG1RemSet(G1CollectedHeap* g1) : G1RemSet(g1) {}
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101
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102 void oops_into_collection_set_do(OopsInHeapRegionClosure* blk,
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103 int worker_i);
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104
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105 void prepare_for_oops_into_collection_set_do() {}
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106 void cleanup_after_oops_into_collection_set_do() {}
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107
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108 // Nothing is necessary in the version below.
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109 void write_ref(HeapRegion* from, oop* p) {}
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110 void write_ref(HeapRegion* from, narrowOop* p) {}
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111 void par_write_ref(HeapRegion* from, oop* p, int tid) {}
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112 void par_write_ref(HeapRegion* from, narrowOop* p, int tid) {}
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113
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114 void scrub(BitMap* region_bm, BitMap* card_bm) {}
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115 void scrub_par(BitMap* region_bm, BitMap* card_bm,
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116 int worker_num, int claim_val) {}
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117
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118 };
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119
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120 // A G1RemSet in which each heap region has a rem set that records the
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121 // external heap references into it. Uses a mod ref bs to track updates,
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122 // so that they can be used to update the individual region remsets.
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123
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124 class HRInto_G1RemSet: public G1RemSet {
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125 protected:
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126 enum SomePrivateConstants {
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127 UpdateRStoMergeSync = 0,
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128 MergeRStoDoDirtySync = 1,
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129 DoDirtySync = 2,
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130 LastSync = 3,
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131
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132 SeqTask = 0,
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133 NumSeqTasks = 1
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134 };
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135
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136 CardTableModRefBS* _ct_bs;
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137 SubTasksDone* _seq_task;
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138 G1CollectorPolicy* _g1p;
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139
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140 ConcurrentG1Refine* _cg1r;
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141
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142 size_t* _cards_scanned;
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143 size_t _total_cards_scanned;
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144
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145 // _par_traversal_in_progress is "true" iff a parallel traversal is in
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146 // progress. If so, then cards added to remembered sets should also have
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147 // their references into the collection summarized in "_new_refs".
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148 bool _par_traversal_in_progress;
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149 void set_par_traversal(bool b) { _par_traversal_in_progress = b; }
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150 GrowableArray<OopOrNarrowOopStar>** _new_refs;
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151 template <class T> void new_refs_iterate_work(OopClosure* cl);
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152 void new_refs_iterate(OopClosure* cl) {
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153 if (UseCompressedOops) {
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154 new_refs_iterate_work<narrowOop>(cl);
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155 } else {
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156 new_refs_iterate_work<oop>(cl);
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157 }
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158 }
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159
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160 // The routine that performs the actual work of refining a dirty
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161 // card.
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162 void concurrentRefineOneCard_impl(jbyte* card_ptr, int worker_i);
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163
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164 protected:
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165 template <class T> void write_ref_nv(HeapRegion* from, T* p);
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166 template <class T> void par_write_ref_nv(HeapRegion* from, T* p, int tid);
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167
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168 public:
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169 // This is called to reset dual hash tables after the gc pause
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170 // is finished and the initial hash table is no longer being
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171 // scanned.
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172 void cleanupHRRS();
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173
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174 HRInto_G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs);
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175 ~HRInto_G1RemSet();
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176
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177 void oops_into_collection_set_do(OopsInHeapRegionClosure* blk,
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178 int worker_i);
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179
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180 void prepare_for_oops_into_collection_set_do();
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181 void cleanup_after_oops_into_collection_set_do();
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182 void scanRS(OopsInHeapRegionClosure* oc, int worker_i);
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183 template <class T> void scanNewRefsRS_work(OopsInHeapRegionClosure* oc, int worker_i);
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184 void scanNewRefsRS(OopsInHeapRegionClosure* oc, int worker_i) {
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185 if (UseCompressedOops) {
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186 scanNewRefsRS_work<narrowOop>(oc, worker_i);
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187 } else {
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188 scanNewRefsRS_work<oop>(oc, worker_i);
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189 }
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190 }
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191 void updateRS(int worker_i);
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192 HeapRegion* calculateStartRegion(int i);
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193
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194 HRInto_G1RemSet* as_HRInto_G1RemSet() { return this; }
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195
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196 CardTableModRefBS* ct_bs() { return _ct_bs; }
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197 size_t cardsScanned() { return _total_cards_scanned; }
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198
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199 // Record, if necessary, the fact that *p (where "p" is in region "from",
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200 // which is required to be non-NULL) has changed to a new non-NULL value.
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201 // [Below the virtual version calls a non-virtual protected
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202 // workhorse that is templatified for narrow vs wide oop.]
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203 inline void write_ref(HeapRegion* from, oop* p) {
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204 write_ref_nv(from, p);
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205 }
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206 inline void write_ref(HeapRegion* from, narrowOop* p) {
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207 write_ref_nv(from, p);
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208 }
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209 inline void par_write_ref(HeapRegion* from, oop* p, int tid) {
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210 par_write_ref_nv(from, p, tid);
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211 }
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212 inline void par_write_ref(HeapRegion* from, narrowOop* p, int tid) {
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213 par_write_ref_nv(from, p, tid);
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214 }
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215
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216 bool self_forwarded(oop obj);
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217
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218 void scrub(BitMap* region_bm, BitMap* card_bm);
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219 void scrub_par(BitMap* region_bm, BitMap* card_bm,
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220 int worker_num, int claim_val);
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221
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222 virtual void concurrentRefineOneCard(jbyte* card_ptr, int worker_i);
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223
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224 virtual void print_summary_info();
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225 virtual void prepare_for_verify();
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226 };
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227
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228 #define G1_REM_SET_LOGGING 0
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229
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230 class CountNonCleanMemRegionClosure: public MemRegionClosure {
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231 G1CollectedHeap* _g1;
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232 int _n;
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233 HeapWord* _start_first;
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234 public:
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235 CountNonCleanMemRegionClosure(G1CollectedHeap* g1) :
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236 _g1(g1), _n(0), _start_first(NULL)
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237 {}
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238 void do_MemRegion(MemRegion mr);
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239 int n() { return _n; };
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240 HeapWord* start_first() { return _start_first; }
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241 };
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242
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243 class UpdateRSOopClosure: public OopClosure {
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244 HeapRegion* _from;
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245 HRInto_G1RemSet* _rs;
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246 int _worker_i;
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247
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248 template <class T> void do_oop_work(T* p);
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249
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250 public:
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251 UpdateRSOopClosure(HRInto_G1RemSet* rs, int worker_i = 0) :
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252 _from(NULL), _rs(rs), _worker_i(worker_i) {
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253 guarantee(_rs != NULL, "Requires an HRIntoG1RemSet");
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254 }
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255
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256 void set_from(HeapRegion* from) {
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257 assert(from != NULL, "from region must be non-NULL");
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258 _from = from;
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259 }
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260
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261 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
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262 virtual void do_oop(oop* p) { do_oop_work(p); }
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263
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264 // Override: this closure is idempotent.
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265 // bool idempotent() { return true; }
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266 bool apply_to_weak_ref_discovered_field() { return true; }
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267 };