Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1RemSet.hpp @ 8733:9def4075da6d
8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord
Summary: Update the task local finger to the start of the next object when marking aborts, in order to avoid the redundant scanning of all 0's when the marking task restarts, if otherwise updating to the next word. In addition, reuse the routine nextObject() in routine iterate().
Reviewed-by: johnc, ysr
Contributed-by: tamao <tao.mao@oracle.com>
| author | tamao |
|---|---|
| date | Tue, 05 Mar 2013 15:36:56 -0800 |
| parents | da91efe96a93 |
| children | 5c93c1f61226 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 4839 | 2 * Copyright (c) 2001, 2012, 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 | |
| 342 | 28 // A G1RemSet provides ways of iterating over pointers into a selected |
| 29 // collection set. | |
| 30 | |
| 31 class G1CollectedHeap; | |
| 32 class CardTableModRefBarrierSet; | |
| 33 class ConcurrentG1Refine; | |
| 34 | |
| 1861 | 35 // A G1RemSet in which each heap region has a rem set that records the |
| 36 // external heap references into it. Uses a mod ref bs to track updates, | |
| 37 // so that they can be used to update the individual region remsets. | |
| 38 | |
| 6197 | 39 class G1RemSet: public CHeapObj<mtGC> { |
| 342 | 40 protected: |
| 41 G1CollectedHeap* _g1; | |
| 42 unsigned _conc_refine_cards; | |
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43 uint n_workers(); |
| 342 | 44 |
| 45 protected: | |
| 46 enum SomePrivateConstants { | |
| 47 UpdateRStoMergeSync = 0, | |
| 48 MergeRStoDoDirtySync = 1, | |
| 49 DoDirtySync = 2, | |
| 50 LastSync = 3, | |
| 51 | |
| 52 SeqTask = 0, | |
| 53 NumSeqTasks = 1 | |
| 54 }; | |
| 55 | |
| 56 CardTableModRefBS* _ct_bs; | |
| 57 SubTasksDone* _seq_task; | |
| 58 G1CollectorPolicy* _g1p; | |
| 59 | |
| 60 ConcurrentG1Refine* _cg1r; | |
| 61 | |
| 62 size_t* _cards_scanned; | |
| 63 size_t _total_cards_scanned; | |
| 64 | |
| 1705 | 65 // Used for caching the closure that is responsible for scanning |
| 66 // references into the collection set. | |
| 67 OopsInHeapRegionClosure** _cset_rs_update_cl; | |
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68 |
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69 // The routine that performs the actual work of refining a dirty |
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70 // card. |
| 1705 | 71 // If check_for_refs_into_refs is true then a true result is returned |
| 72 // if the card contains oops that have references into the current | |
| 73 // collection set. | |
| 74 bool concurrentRefineOneCard_impl(jbyte* card_ptr, int worker_i, | |
| 75 bool check_for_refs_into_cset); | |
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76 |
| 342 | 77 public: |
| 78 // This is called to reset dual hash tables after the gc pause | |
| 79 // is finished and the initial hash table is no longer being | |
| 80 // scanned. | |
| 81 void cleanupHRRS(); | |
| 82 | |
| 1861 | 83 G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs); |
| 84 ~G1RemSet(); | |
| 342 | 85 |
| 1861 | 86 // Invoke "blk->do_oop" on all pointers into the CS in objects in regions |
| 87 // outside the CS (having invoked "blk->set_region" to set the "from" | |
| 88 // region correctly beforehand.) The "worker_i" param is for the | |
| 89 // parallel case where the number of the worker thread calling this | |
| 90 // function can be helpful in partitioning the work to be done. It | |
| 91 // should be the same as the "i" passed to the calling thread's | |
| 92 // work(i) function. In the sequential case this param will be ingored. | |
| 342 | 93 void oops_into_collection_set_do(OopsInHeapRegionClosure* blk, |
| 94 int worker_i); | |
| 95 | |
| 1861 | 96 // Prepare for and cleanup after an oops_into_collection_set_do |
| 97 // call. Must call each of these once before and after (in sequential | |
| 98 // code) any threads call oops_into_collection_set_do. (This offers an | |
| 99 // opportunity to sequential setup and teardown of structures needed by a | |
| 100 // parallel iteration over the CS's RS.) | |
| 342 | 101 void prepare_for_oops_into_collection_set_do(); |
| 102 void cleanup_after_oops_into_collection_set_do(); | |
| 1861 | 103 |
| 342 | 104 void scanRS(OopsInHeapRegionClosure* oc, int worker_i); |
| 1705 | 105 void updateRS(DirtyCardQueue* into_cset_dcq, int worker_i); |
| 1861 | 106 |
| 342 | 107 CardTableModRefBS* ct_bs() { return _ct_bs; } |
| 108 size_t cardsScanned() { return _total_cards_scanned; } | |
| 109 | |
| 110 // Record, if necessary, the fact that *p (where "p" is in region "from", | |
| 111 // which is required to be non-NULL) has changed to a new non-NULL value. | |
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112 template <class T> void write_ref(HeapRegion* from, T* p); |
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113 template <class T> void par_write_ref(HeapRegion* from, T* p, int tid); |
| 342 | 114 |
| 1861 | 115 // Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region |
| 116 // or card, respectively, such that a region or card with a corresponding | |
| 117 // 0 bit contains no part of any live object. Eliminates any remembered | |
| 118 // set entries that correspond to dead heap ranges. | |
| 342 | 119 void scrub(BitMap* region_bm, BitMap* card_bm); |
| 1861 | 120 |
| 121 // Like the above, but assumes is called in parallel: "worker_num" is the | |
| 122 // parallel thread id of the current thread, and "claim_val" is the | |
| 123 // value that should be used to claim heap regions. | |
| 342 | 124 void scrub_par(BitMap* region_bm, BitMap* card_bm, |
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125 uint worker_num, int claim_val); |
| 342 | 126 |
| 1861 | 127 // Refine the card corresponding to "card_ptr". If "sts" is non-NULL, |
| 128 // join and leave around parts that must be atomic wrt GC. (NULL means | |
| 129 // being done at a safepoint.) | |
| 130 // If check_for_refs_into_cset is true, a true result is returned | |
| 131 // if the given card contains oops that have references into the | |
| 132 // current collection set. | |
| 1705 | 133 virtual bool concurrentRefineOneCard(jbyte* card_ptr, int worker_i, |
| 134 bool check_for_refs_into_cset); | |
| 342 | 135 |
| 1861 | 136 // Print any relevant summary info. |
| 342 | 137 virtual void print_summary_info(); |
| 1861 | 138 |
| 139 // Prepare remembered set for verification. | |
| 342 | 140 virtual void prepare_for_verify(); |
| 141 }; | |
| 142 | |
| 143 class CountNonCleanMemRegionClosure: public MemRegionClosure { | |
| 144 G1CollectedHeap* _g1; | |
| 145 int _n; | |
| 146 HeapWord* _start_first; | |
| 147 public: | |
| 148 CountNonCleanMemRegionClosure(G1CollectedHeap* g1) : | |
| 149 _g1(g1), _n(0), _start_first(NULL) | |
| 150 {} | |
| 151 void do_MemRegion(MemRegion mr); | |
| 152 int n() { return _n; }; | |
| 153 HeapWord* start_first() { return _start_first; } | |
| 154 }; | |
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155 |
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156 class UpdateRSOopClosure: public ExtendedOopClosure { |
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157 HeapRegion* _from; |
| 1861 | 158 G1RemSet* _rs; |
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159 int _worker_i; |
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160 |
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161 template <class T> void do_oop_work(T* p); |
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162 |
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163 public: |
| 1861 | 164 UpdateRSOopClosure(G1RemSet* rs, int worker_i = 0) : |
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165 _from(NULL), _rs(rs), _worker_i(worker_i) |
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166 {} |
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167 |
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168 void set_from(HeapRegion* from) { |
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169 assert(from != NULL, "from region must be non-NULL"); |
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170 _from = from; |
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171 } |
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172 |
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173 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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174 virtual void do_oop(oop* p) { do_oop_work(p); } |
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175 |
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176 // Override: this closure is idempotent. |
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177 // bool idempotent() { return true; } |
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178 bool apply_to_weak_ref_discovered_field() { return true; } |
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179 }; |
| 1705 | 180 |
| 181 class UpdateRSetImmediate: public OopsInHeapRegionClosure { | |
| 182 private: | |
| 183 G1RemSet* _g1_rem_set; | |
| 184 | |
| 185 template <class T> void do_oop_work(T* p); | |
| 186 public: | |
| 187 UpdateRSetImmediate(G1RemSet* rs) : | |
| 188 _g1_rem_set(rs) {} | |
| 189 | |
| 190 virtual void do_oop(narrowOop* p) { do_oop_work(p); } | |
| 191 virtual void do_oop( oop* p) { do_oop_work(p); } | |
| 192 }; | |
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193 |
| 1972 | 194 |
| 195 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP |