Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1RemSet.hpp @ 23222:8e83e6b768b8
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Reviewed-by: mgerdin, brutisso
| author | ehelin |
|---|---|
| date | Thu, 23 Oct 2014 11:43:29 +0200 |
| parents | b554c7fa9478 |
| children | 38d6febe66af |
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| 342 | 1 /* |
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2 * Copyright (c) 2001, 2014, 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; | |
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36 class G1ParPushHeapRSClosure; |
| 342 | 37 |
| 1861 | 38 // A G1RemSet in which each heap region has a rem set that records the |
| 39 // external heap references into it. Uses a mod ref bs to track updates, | |
| 40 // so that they can be used to update the individual region remsets. | |
| 41 | |
| 6197 | 42 class G1RemSet: public CHeapObj<mtGC> { |
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43 private: |
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44 G1RemSetSummary _prev_period_summary; |
| 342 | 45 protected: |
| 46 G1CollectedHeap* _g1; | |
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47 size_t _conc_refine_cards; |
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48 uint n_workers(); |
| 342 | 49 |
| 50 protected: | |
| 51 enum SomePrivateConstants { | |
| 52 UpdateRStoMergeSync = 0, | |
| 53 MergeRStoDoDirtySync = 1, | |
| 54 DoDirtySync = 2, | |
| 55 LastSync = 3, | |
| 56 | |
| 57 SeqTask = 0, | |
| 58 NumSeqTasks = 1 | |
| 59 }; | |
| 60 | |
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61 CardTableModRefBS* _ct_bs; |
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62 SubTasksDone* _seq_task; |
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63 G1CollectorPolicy* _g1p; |
| 342 | 64 |
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65 ConcurrentG1Refine* _cg1r; |
| 342 | 66 |
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67 size_t* _cards_scanned; |
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68 size_t _total_cards_scanned; |
| 342 | 69 |
| 1705 | 70 // Used for caching the closure that is responsible for scanning |
| 71 // references into the collection set. | |
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72 G1ParPushHeapRSClosure** _cset_rs_update_cl; |
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73 |
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74 // Print the given summary info |
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75 virtual void print_summary_info(G1RemSetSummary * summary, const char * header = NULL); |
| 342 | 76 public: |
| 77 // This is called to reset dual hash tables after the gc pause | |
| 78 // is finished and the initial hash table is no longer being | |
| 79 // scanned. | |
| 80 void cleanupHRRS(); | |
| 81 | |
| 1861 | 82 G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs); |
| 83 ~G1RemSet(); | |
| 342 | 84 |
| 12080 | 85 // Invoke "blk->do_oop" on all pointers into the collection set |
| 86 // from objects in regions outside the collection set (having | |
| 87 // invoked "blk->set_region" to set the "from" region correctly | |
| 88 // beforehand.) | |
| 89 // | |
| 90 // Invoke code_root_cl->do_code_blob on the unmarked nmethods | |
| 91 // on the strong code roots list for each region in the | |
| 92 // collection set. | |
| 93 // | |
| 94 // The "worker_i" param is for the parallel case where the id | |
| 95 // of the worker thread calling this function can be helpful in | |
| 96 // partitioning the work to be done. It should be the same as | |
| 97 // the "i" passed to the calling thread's work(i) function. | |
| 98 // In the sequential case this param will be ignored. | |
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99 void oops_into_collection_set_do(G1ParPushHeapRSClosure* blk, |
| 20494 | 100 CodeBlobClosure* code_root_cl, |
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101 uint worker_i); |
| 342 | 102 |
| 1861 | 103 // Prepare for and cleanup after an oops_into_collection_set_do |
| 104 // call. Must call each of these once before and after (in sequential | |
| 105 // code) any threads call oops_into_collection_set_do. (This offers an | |
| 106 // opportunity to sequential setup and teardown of structures needed by a | |
| 107 // parallel iteration over the CS's RS.) | |
| 342 | 108 void prepare_for_oops_into_collection_set_do(); |
| 109 void cleanup_after_oops_into_collection_set_do(); | |
| 1861 | 110 |
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111 void scanRS(G1ParPushHeapRSClosure* oc, |
| 20494 | 112 CodeBlobClosure* code_root_cl, |
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113 uint worker_i); |
| 12080 | 114 |
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115 void updateRS(DirtyCardQueue* into_cset_dcq, uint worker_i); |
| 1861 | 116 |
| 342 | 117 CardTableModRefBS* ct_bs() { return _ct_bs; } |
| 118 size_t cardsScanned() { return _total_cards_scanned; } | |
| 119 | |
| 120 // Record, if necessary, the fact that *p (where "p" is in region "from", | |
| 121 // which is required to be non-NULL) has changed to a new non-NULL value. | |
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122 template <class T> void write_ref(HeapRegion* from, T* p); |
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123 template <class T> void par_write_ref(HeapRegion* from, T* p, int tid); |
| 342 | 124 |
| 1861 | 125 // Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region |
| 126 // or card, respectively, such that a region or card with a corresponding | |
| 127 // 0 bit contains no part of any live object. Eliminates any remembered | |
| 128 // set entries that correspond to dead heap ranges. | |
| 342 | 129 void scrub(BitMap* region_bm, BitMap* card_bm); |
| 1861 | 130 |
| 131 // Like the above, but assumes is called in parallel: "worker_num" is the | |
| 132 // parallel thread id of the current thread, and "claim_val" is the | |
| 133 // value that should be used to claim heap regions. | |
| 342 | 134 void scrub_par(BitMap* region_bm, BitMap* card_bm, |
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135 uint worker_num, int claim_val); |
| 342 | 136 |
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137 // Refine the card corresponding to "card_ptr". |
| 1861 | 138 // If check_for_refs_into_cset is true, a true result is returned |
| 139 // if the given card contains oops that have references into the | |
| 140 // current collection set. | |
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141 virtual bool refine_card(jbyte* card_ptr, |
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142 uint worker_i, |
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143 bool check_for_refs_into_cset); |
| 342 | 144 |
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145 // Print accumulated summary info from the start of the VM. |
| 342 | 146 virtual void print_summary_info(); |
| 1861 | 147 |
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148 // Print accumulated summary info from the last time called. |
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149 virtual void print_periodic_summary_info(const char* header); |
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150 |
| 1861 | 151 // Prepare remembered set for verification. |
| 342 | 152 virtual void prepare_for_verify(); |
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153 |
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154 size_t conc_refine_cards() const { |
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155 return _conc_refine_cards; |
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156 } |
| 342 | 157 }; |
| 158 | |
| 159 class CountNonCleanMemRegionClosure: public MemRegionClosure { | |
| 160 G1CollectedHeap* _g1; | |
| 161 int _n; | |
| 162 HeapWord* _start_first; | |
| 163 public: | |
| 164 CountNonCleanMemRegionClosure(G1CollectedHeap* g1) : | |
| 165 _g1(g1), _n(0), _start_first(NULL) | |
| 166 {} | |
| 167 void do_MemRegion(MemRegion mr); | |
| 168 int n() { return _n; }; | |
| 169 HeapWord* start_first() { return _start_first; } | |
| 170 }; | |
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171 |
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172 class UpdateRSOopClosure: public ExtendedOopClosure { |
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173 HeapRegion* _from; |
| 1861 | 174 G1RemSet* _rs; |
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175 uint _worker_i; |
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176 |
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177 template <class T> void do_oop_work(T* p); |
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178 |
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179 public: |
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180 UpdateRSOopClosure(G1RemSet* rs, uint worker_i = 0) : |
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181 _from(NULL), _rs(rs), _worker_i(worker_i) |
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182 {} |
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183 |
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184 void set_from(HeapRegion* from) { |
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185 assert(from != NULL, "from region must be non-NULL"); |
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186 _from = from; |
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187 } |
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188 |
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189 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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190 virtual void do_oop(oop* p) { do_oop_work(p); } |
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191 |
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192 // Override: this closure is idempotent. |
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193 // bool idempotent() { return true; } |
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194 bool apply_to_weak_ref_discovered_field() { return true; } |
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195 }; |
| 1705 | 196 |
| 1972 | 197 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP |