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annotate src/share/vm/gc_implementation/g1/g1RemSet.hpp @ 19083:09292c24d555
LSStackSlotAllocator: hide inner class.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Sat, 31 Jan 2015 11:07:15 +0100 |
parents | 52b4284cb496 |
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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 |
12080 | 84 // Invoke "blk->do_oop" on all pointers into the collection set |
85 // from objects in regions outside the collection set (having | |
86 // invoked "blk->set_region" to set the "from" region correctly | |
87 // beforehand.) | |
88 // | |
89 // Invoke code_root_cl->do_code_blob on the unmarked nmethods | |
90 // on the strong code roots list for each region in the | |
91 // collection set. | |
92 // | |
93 // The "worker_i" param is for the parallel case where the id | |
94 // of the worker thread calling this function can be helpful in | |
95 // partitioning the work to be done. It should be the same as | |
96 // the "i" passed to the calling thread's work(i) function. | |
97 // In the sequential case this param will be ignored. | |
98 void oops_into_collection_set_do(OopsInHeapRegionClosure* blk, | |
99 CodeBlobToOopClosure* code_root_cl, | |
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100 uint worker_i); |
342 | 101 |
1861 | 102 // Prepare for and cleanup after an oops_into_collection_set_do |
103 // call. Must call each of these once before and after (in sequential | |
104 // code) any threads call oops_into_collection_set_do. (This offers an | |
105 // opportunity to sequential setup and teardown of structures needed by a | |
106 // parallel iteration over the CS's RS.) | |
342 | 107 void prepare_for_oops_into_collection_set_do(); |
108 void cleanup_after_oops_into_collection_set_do(); | |
1861 | 109 |
12080 | 110 void scanRS(OopsInHeapRegionClosure* oc, |
111 CodeBlobToOopClosure* code_root_cl, | |
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112 uint worker_i); |
12080 | 113 |
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114 void updateRS(DirtyCardQueue* into_cset_dcq, uint worker_i); |
1861 | 115 |
342 | 116 CardTableModRefBS* ct_bs() { return _ct_bs; } |
117 size_t cardsScanned() { return _total_cards_scanned; } | |
118 | |
119 // Record, if necessary, the fact that *p (where "p" is in region "from", | |
120 // which is required to be non-NULL) has changed to a new non-NULL value. | |
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121 template <class T> void write_ref(HeapRegion* from, T* p); |
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122 template <class T> void par_write_ref(HeapRegion* from, T* p, int tid); |
342 | 123 |
1861 | 124 // Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region |
125 // or card, respectively, such that a region or card with a corresponding | |
126 // 0 bit contains no part of any live object. Eliminates any remembered | |
127 // set entries that correspond to dead heap ranges. | |
342 | 128 void scrub(BitMap* region_bm, BitMap* card_bm); |
1861 | 129 |
130 // Like the above, but assumes is called in parallel: "worker_num" is the | |
131 // parallel thread id of the current thread, and "claim_val" is the | |
132 // value that should be used to claim heap regions. | |
342 | 133 void scrub_par(BitMap* region_bm, BitMap* card_bm, |
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134 uint worker_num, int claim_val); |
342 | 135 |
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136 // Refine the card corresponding to "card_ptr". |
1861 | 137 // If check_for_refs_into_cset is true, a true result is returned |
138 // if the given card contains oops that have references into the | |
139 // current collection set. | |
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140 virtual bool refine_card(jbyte* card_ptr, |
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141 uint worker_i, |
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142 bool check_for_refs_into_cset); |
342 | 143 |
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144 // Print accumulated summary info from the start of the VM. |
342 | 145 virtual void print_summary_info(); |
1861 | 146 |
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147 // Print accumulated summary info from the last time called. |
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148 virtual void print_periodic_summary_info(const char* header); |
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149 |
1861 | 150 // Prepare remembered set for verification. |
342 | 151 virtual void prepare_for_verify(); |
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152 |
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153 size_t conc_refine_cards() const { |
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154 return _conc_refine_cards; |
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155 } |
342 | 156 }; |
157 | |
158 class CountNonCleanMemRegionClosure: public MemRegionClosure { | |
159 G1CollectedHeap* _g1; | |
160 int _n; | |
161 HeapWord* _start_first; | |
162 public: | |
163 CountNonCleanMemRegionClosure(G1CollectedHeap* g1) : | |
164 _g1(g1), _n(0), _start_first(NULL) | |
165 {} | |
166 void do_MemRegion(MemRegion mr); | |
167 int n() { return _n; }; | |
168 HeapWord* start_first() { return _start_first; } | |
169 }; | |
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170 |
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171 class UpdateRSOopClosure: public ExtendedOopClosure { |
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172 HeapRegion* _from; |
1861 | 173 G1RemSet* _rs; |
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174 uint _worker_i; |
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175 |
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176 template <class T> void do_oop_work(T* p); |
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177 |
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178 public: |
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179 UpdateRSOopClosure(G1RemSet* rs, uint worker_i = 0) : |
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180 _from(NULL), _rs(rs), _worker_i(worker_i) |
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181 {} |
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182 |
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183 void set_from(HeapRegion* from) { |
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184 assert(from != NULL, "from region must be non-NULL"); |
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185 _from = from; |
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186 } |
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187 |
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188 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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189 virtual void do_oop(oop* p) { do_oop_work(p); } |
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190 |
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191 // Override: this closure is idempotent. |
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192 // bool idempotent() { return true; } |
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193 bool apply_to_weak_ref_discovered_field() { return true; } |
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194 }; |
1705 | 195 |
196 class UpdateRSetImmediate: public OopsInHeapRegionClosure { | |
197 private: | |
198 G1RemSet* _g1_rem_set; | |
199 | |
200 template <class T> void do_oop_work(T* p); | |
201 public: | |
202 UpdateRSetImmediate(G1RemSet* rs) : | |
203 _g1_rem_set(rs) {} | |
204 | |
205 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
206 virtual void do_oop( oop* p) { do_oop_work(p); } | |
207 }; | |
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208 |
1972 | 209 |
210 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP |