Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1RemSet.hpp @ 12035:33d39b75663f
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 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 * | |
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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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP | |
27 | |
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28 #include "gc_implementation/g1/g1RemSetSummary.hpp" |
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29 |
342 | 30 // A G1RemSet provides ways of iterating over pointers into a selected |
31 // collection set. | |
32 | |
33 class G1CollectedHeap; | |
34 class CardTableModRefBarrierSet; | |
35 class ConcurrentG1Refine; | |
36 | |
1861 | 37 // A G1RemSet in which each heap region has a rem set that records the |
38 // external heap references into it. Uses a mod ref bs to track updates, | |
39 // so that they can be used to update the individual region remsets. | |
40 | |
6197 | 41 class G1RemSet: public CHeapObj<mtGC> { |
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42 private: |
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43 G1RemSetSummary _prev_period_summary; |
342 | 44 protected: |
45 G1CollectedHeap* _g1; | |
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46 size_t _conc_refine_cards; |
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47 uint n_workers(); |
342 | 48 |
49 protected: | |
50 enum SomePrivateConstants { | |
51 UpdateRStoMergeSync = 0, | |
52 MergeRStoDoDirtySync = 1, | |
53 DoDirtySync = 2, | |
54 LastSync = 3, | |
55 | |
56 SeqTask = 0, | |
57 NumSeqTasks = 1 | |
58 }; | |
59 | |
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60 CardTableModRefBS* _ct_bs; |
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61 SubTasksDone* _seq_task; |
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62 G1CollectorPolicy* _g1p; |
342 | 63 |
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64 ConcurrentG1Refine* _cg1r; |
342 | 65 |
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66 size_t* _cards_scanned; |
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67 size_t _total_cards_scanned; |
342 | 68 |
1705 | 69 // Used for caching the closure that is responsible for scanning |
70 // references into the collection set. | |
71 OopsInHeapRegionClosure** _cset_rs_update_cl; | |
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72 |
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73 // Print the given summary info |
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74 virtual void print_summary_info(G1RemSetSummary * summary, const char * header = NULL); |
342 | 75 public: |
76 // This is called to reset dual hash tables after the gc pause | |
77 // is finished and the initial hash table is no longer being | |
78 // scanned. | |
79 void cleanupHRRS(); | |
80 | |
1861 | 81 G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs); |
82 ~G1RemSet(); | |
342 | 83 |
1861 | 84 // Invoke "blk->do_oop" on all pointers into the CS in objects in regions |
85 // outside the CS (having invoked "blk->set_region" to set the "from" | |
86 // region correctly beforehand.) The "worker_i" param is for the | |
87 // parallel case where the number of the worker thread calling this | |
88 // function can be helpful in partitioning the work to be done. It | |
89 // should be the same as the "i" passed to the calling thread's | |
90 // work(i) function. In the sequential case this param will be ingored. | |
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91 void oops_into_collection_set_do(OopsInHeapRegionClosure* blk, int worker_i); |
342 | 92 |
1861 | 93 // Prepare for and cleanup after an oops_into_collection_set_do |
94 // call. Must call each of these once before and after (in sequential | |
95 // code) any threads call oops_into_collection_set_do. (This offers an | |
96 // opportunity to sequential setup and teardown of structures needed by a | |
97 // parallel iteration over the CS's RS.) | |
342 | 98 void prepare_for_oops_into_collection_set_do(); |
99 void cleanup_after_oops_into_collection_set_do(); | |
1861 | 100 |
342 | 101 void scanRS(OopsInHeapRegionClosure* oc, int worker_i); |
1705 | 102 void updateRS(DirtyCardQueue* into_cset_dcq, int worker_i); |
1861 | 103 |
342 | 104 CardTableModRefBS* ct_bs() { return _ct_bs; } |
105 size_t cardsScanned() { return _total_cards_scanned; } | |
106 | |
107 // Record, if necessary, the fact that *p (where "p" is in region "from", | |
108 // which is required to be non-NULL) has changed to a new non-NULL value. | |
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109 template <class T> void write_ref(HeapRegion* from, T* p); |
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110 template <class T> void par_write_ref(HeapRegion* from, T* p, int tid); |
342 | 111 |
1861 | 112 // Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region |
113 // or card, respectively, such that a region or card with a corresponding | |
114 // 0 bit contains no part of any live object. Eliminates any remembered | |
115 // set entries that correspond to dead heap ranges. | |
342 | 116 void scrub(BitMap* region_bm, BitMap* card_bm); |
1861 | 117 |
118 // Like the above, but assumes is called in parallel: "worker_num" is the | |
119 // parallel thread id of the current thread, and "claim_val" is the | |
120 // value that should be used to claim heap regions. | |
342 | 121 void scrub_par(BitMap* region_bm, BitMap* card_bm, |
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122 uint worker_num, int claim_val); |
342 | 123 |
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124 // Refine the card corresponding to "card_ptr". |
1861 | 125 // If check_for_refs_into_cset is true, a true result is returned |
126 // if the given card contains oops that have references into the | |
127 // current collection set. | |
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128 virtual bool refine_card(jbyte* card_ptr, |
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129 int worker_i, |
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130 bool check_for_refs_into_cset); |
342 | 131 |
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132 // Print accumulated summary info from the start of the VM. |
342 | 133 virtual void print_summary_info(); |
1861 | 134 |
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135 // Print accumulated summary info from the last time called. |
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136 virtual void print_periodic_summary_info(); |
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137 |
1861 | 138 // Prepare remembered set for verification. |
342 | 139 virtual void prepare_for_verify(); |
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140 |
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141 size_t conc_refine_cards() const { |
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142 return _conc_refine_cards; |
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143 } |
342 | 144 }; |
145 | |
146 class CountNonCleanMemRegionClosure: public MemRegionClosure { | |
147 G1CollectedHeap* _g1; | |
148 int _n; | |
149 HeapWord* _start_first; | |
150 public: | |
151 CountNonCleanMemRegionClosure(G1CollectedHeap* g1) : | |
152 _g1(g1), _n(0), _start_first(NULL) | |
153 {} | |
154 void do_MemRegion(MemRegion mr); | |
155 int n() { return _n; }; | |
156 HeapWord* start_first() { return _start_first; } | |
157 }; | |
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158 |
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159 class UpdateRSOopClosure: public ExtendedOopClosure { |
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160 HeapRegion* _from; |
1861 | 161 G1RemSet* _rs; |
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162 int _worker_i; |
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163 |
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164 template <class T> void do_oop_work(T* p); |
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165 |
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166 public: |
1861 | 167 UpdateRSOopClosure(G1RemSet* rs, int worker_i = 0) : |
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168 _from(NULL), _rs(rs), _worker_i(worker_i) |
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169 {} |
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170 |
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171 void set_from(HeapRegion* from) { |
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172 assert(from != NULL, "from region must be non-NULL"); |
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173 _from = from; |
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174 } |
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175 |
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176 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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177 virtual void do_oop(oop* p) { do_oop_work(p); } |
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178 |
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179 // Override: this closure is idempotent. |
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180 // bool idempotent() { return true; } |
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181 bool apply_to_weak_ref_discovered_field() { return true; } |
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182 }; |
1705 | 183 |
184 class UpdateRSetImmediate: public OopsInHeapRegionClosure { | |
185 private: | |
186 G1RemSet* _g1_rem_set; | |
187 | |
188 template <class T> void do_oop_work(T* p); | |
189 public: | |
190 UpdateRSetImmediate(G1RemSet* rs) : | |
191 _g1_rem_set(rs) {} | |
192 | |
193 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
194 virtual void do_oop( oop* p) { do_oop_work(p); } | |
195 }; | |
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196 |
1972 | 197 |
198 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP |