Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1RemSet.hpp @ 628:7bb995fbd3c0
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| author | trims |
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| date | Thu, 12 Mar 2009 18:16:36 -0700 |
| parents | 0fbdb4381b99 87fa6e083d82 |
| children | 315a5d70b295 |
| rev | line source |
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| 342 | 1 /* |
| 579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // A G1RemSet provides ways of iterating over pointers into a selected | |
| 26 // collection set. | |
| 27 | |
| 28 class G1CollectedHeap; | |
| 29 class CardTableModRefBarrierSet; | |
| 30 class HRInto_G1RemSet; | |
| 31 class ConcurrentG1Refine; | |
| 32 | |
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33 class G1RemSet: public CHeapObj { |
| 342 | 34 protected: |
| 35 G1CollectedHeap* _g1; | |
| 36 | |
| 37 unsigned _conc_refine_traversals; | |
| 38 unsigned _conc_refine_cards; | |
| 39 | |
| 40 size_t n_workers(); | |
| 41 | |
| 42 public: | |
| 43 G1RemSet(G1CollectedHeap* g1) : | |
| 44 _g1(g1), _conc_refine_traversals(0), _conc_refine_cards(0) | |
| 45 {} | |
| 46 | |
| 47 // Invoke "blk->do_oop" on all pointers into the CS in object in regions | |
| 48 // outside the CS (having invoked "blk->set_region" to set the "from" | |
| 49 // region correctly beforehand.) The "worker_i" param is for the | |
| 50 // parallel case where the number of the worker thread calling this | |
| 51 // function can be helpful in partitioning the work to be done. It | |
| 52 // should be the same as the "i" passed to the calling thread's | |
| 53 // work(i) function. In the sequential case this param will be ingored. | |
| 54 virtual void oops_into_collection_set_do(OopsInHeapRegionClosure* blk, | |
| 55 int worker_i) = 0; | |
| 56 | |
| 57 // Prepare for and cleanup after an oops_into_collection_set_do | |
| 58 // call. Must call each of these once before and after (in sequential | |
| 59 // code) any threads call oops into collection set do. (This offers an | |
| 60 // opportunity to sequential setup and teardown of structures needed by a | |
| 61 // parallel iteration over the CS's RS.) | |
| 62 virtual void prepare_for_oops_into_collection_set_do() = 0; | |
| 63 virtual void cleanup_after_oops_into_collection_set_do() = 0; | |
| 64 | |
| 65 // If "this" is of the given subtype, return "this", else "NULL". | |
| 66 virtual HRInto_G1RemSet* as_HRInto_G1RemSet() { return NULL; } | |
| 67 | |
| 68 // Record, if necessary, the fact that *p (where "p" is in region "from") | |
| 69 // has changed to its new value. | |
| 70 virtual void write_ref(HeapRegion* from, oop* p) = 0; | |
| 71 virtual void par_write_ref(HeapRegion* from, oop* p, int tid) = 0; | |
| 72 | |
| 73 // Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region | |
| 74 // or card, respectively, such that a region or card with a corresponding | |
| 75 // 0 bit contains no part of any live object. Eliminates any remembered | |
| 76 // set entries that correspond to dead heap ranges. | |
| 77 virtual void scrub(BitMap* region_bm, BitMap* card_bm) = 0; | |
| 78 // Like the above, but assumes is called in parallel: "worker_num" is the | |
| 79 // parallel thread id of the current thread, and "claim_val" is the | |
| 80 // value that should be used to claim heap regions. | |
| 81 virtual void scrub_par(BitMap* region_bm, BitMap* card_bm, | |
| 82 int worker_num, int claim_val) = 0; | |
| 83 | |
| 84 // Do any "refinement" activity that might be appropriate to the given | |
| 85 // G1RemSet. If "refinement" has iterateive "passes", do one pass. | |
| 86 // If "t" is non-NULL, it is the thread performing the refinement. | |
| 87 // Default implementation does nothing. | |
| 88 virtual void concurrentRefinementPass(ConcurrentG1Refine* cg1r) {} | |
| 89 | |
| 90 // Refine the card corresponding to "card_ptr". If "sts" is non-NULL, | |
| 91 // join and leave around parts that must be atomic wrt GC. (NULL means | |
| 92 // being done at a safepoint.) | |
| 93 virtual void concurrentRefineOneCard(jbyte* card_ptr, int worker_i) {} | |
| 94 | |
| 95 unsigned conc_refine_cards() { return _conc_refine_cards; } | |
| 96 | |
| 97 // Print any relevant summary info. | |
| 98 virtual void print_summary_info() {} | |
| 99 | |
| 100 // Prepare remebered set for verification. | |
| 101 virtual void prepare_for_verify() {}; | |
| 102 }; | |
| 103 | |
| 104 | |
| 105 // The simplest possible G1RemSet: iterates over all objects in non-CS | |
| 106 // regions, searching for pointers into the CS. | |
| 107 class StupidG1RemSet: public G1RemSet { | |
| 108 public: | |
| 109 StupidG1RemSet(G1CollectedHeap* g1) : G1RemSet(g1) {} | |
| 110 | |
| 111 void oops_into_collection_set_do(OopsInHeapRegionClosure* blk, | |
| 112 int worker_i); | |
| 113 | |
| 114 void prepare_for_oops_into_collection_set_do() {} | |
| 115 void cleanup_after_oops_into_collection_set_do() {} | |
| 116 | |
| 117 // Nothing is necessary in the version below. | |
| 118 void write_ref(HeapRegion* from, oop* p) {} | |
| 119 void par_write_ref(HeapRegion* from, oop* p, int tid) {} | |
| 120 | |
| 121 void scrub(BitMap* region_bm, BitMap* card_bm) {} | |
| 122 void scrub_par(BitMap* region_bm, BitMap* card_bm, | |
| 123 int worker_num, int claim_val) {} | |
| 124 | |
| 125 }; | |
| 126 | |
| 127 // A G1RemSet in which each heap region has a rem set that records the | |
| 128 // external heap references into it. Uses a mod ref bs to track updates, | |
| 129 // so that they can be used to update the individual region remsets. | |
| 130 | |
| 131 class HRInto_G1RemSet: public G1RemSet { | |
| 132 protected: | |
| 133 enum SomePrivateConstants { | |
| 134 UpdateRStoMergeSync = 0, | |
| 135 MergeRStoDoDirtySync = 1, | |
| 136 DoDirtySync = 2, | |
| 137 LastSync = 3, | |
| 138 | |
| 139 SeqTask = 0, | |
| 140 NumSeqTasks = 1 | |
| 141 }; | |
| 142 | |
| 143 CardTableModRefBS* _ct_bs; | |
| 144 SubTasksDone* _seq_task; | |
| 145 G1CollectorPolicy* _g1p; | |
| 146 | |
| 147 ConcurrentG1Refine* _cg1r; | |
| 148 | |
| 149 size_t* _cards_scanned; | |
| 150 size_t _total_cards_scanned; | |
| 151 | |
| 152 // _par_traversal_in_progress is "true" iff a parallel traversal is in | |
| 153 // progress. If so, then cards added to remembered sets should also have | |
| 154 // their references into the collection summarized in "_new_refs". | |
| 155 bool _par_traversal_in_progress; | |
| 156 void set_par_traversal(bool b); | |
| 157 GrowableArray<oop*>** _new_refs; | |
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158 void new_refs_iterate(OopClosure* cl); |
| 342 | 159 |
| 160 public: | |
| 161 // This is called to reset dual hash tables after the gc pause | |
| 162 // is finished and the initial hash table is no longer being | |
| 163 // scanned. | |
| 164 void cleanupHRRS(); | |
| 165 | |
| 166 HRInto_G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs); | |
| 167 ~HRInto_G1RemSet(); | |
| 168 | |
| 169 void oops_into_collection_set_do(OopsInHeapRegionClosure* blk, | |
| 170 int worker_i); | |
| 171 | |
| 172 void prepare_for_oops_into_collection_set_do(); | |
| 173 void cleanup_after_oops_into_collection_set_do(); | |
| 174 void scanRS(OopsInHeapRegionClosure* oc, int worker_i); | |
| 175 void scanNewRefsRS(OopsInHeapRegionClosure* oc, int worker_i); | |
| 176 void updateRS(int worker_i); | |
| 177 HeapRegion* calculateStartRegion(int i); | |
| 178 | |
| 179 HRInto_G1RemSet* as_HRInto_G1RemSet() { return this; } | |
| 180 | |
| 181 CardTableModRefBS* ct_bs() { return _ct_bs; } | |
| 182 size_t cardsScanned() { return _total_cards_scanned; } | |
| 183 | |
| 184 // Record, if necessary, the fact that *p (where "p" is in region "from", | |
| 185 // which is required to be non-NULL) has changed to a new non-NULL value. | |
| 186 inline void write_ref(HeapRegion* from, oop* p); | |
| 187 // The "_nv" version is the same; it exists just so that it is not virtual. | |
| 188 inline void write_ref_nv(HeapRegion* from, oop* p); | |
| 189 | |
| 190 inline bool self_forwarded(oop obj); | |
| 191 inline void par_write_ref(HeapRegion* from, oop* p, int tid); | |
| 192 | |
| 193 void scrub(BitMap* region_bm, BitMap* card_bm); | |
| 194 void scrub_par(BitMap* region_bm, BitMap* card_bm, | |
| 195 int worker_num, int claim_val); | |
| 196 | |
| 197 virtual void concurrentRefinementPass(ConcurrentG1Refine* t); | |
| 198 virtual void concurrentRefineOneCard(jbyte* card_ptr, int worker_i); | |
| 199 | |
| 200 virtual void print_summary_info(); | |
| 201 virtual void prepare_for_verify(); | |
| 202 }; | |
| 203 | |
| 204 #define G1_REM_SET_LOGGING 0 | |
| 205 | |
| 206 class CountNonCleanMemRegionClosure: public MemRegionClosure { | |
| 207 G1CollectedHeap* _g1; | |
| 208 int _n; | |
| 209 HeapWord* _start_first; | |
| 210 public: | |
| 211 CountNonCleanMemRegionClosure(G1CollectedHeap* g1) : | |
| 212 _g1(g1), _n(0), _start_first(NULL) | |
| 213 {} | |
| 214 void do_MemRegion(MemRegion mr); | |
| 215 int n() { return _n; }; | |
| 216 HeapWord* start_first() { return _start_first; } | |
| 217 }; | |
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218 |
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219 class UpdateRSOopClosure: public OopClosure { |
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220 HeapRegion* _from; |
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221 HRInto_G1RemSet* _rs; |
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222 int _worker_i; |
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223 public: |
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224 UpdateRSOopClosure(HRInto_G1RemSet* rs, int worker_i = 0) : |
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225 _from(NULL), _rs(rs), _worker_i(worker_i) { |
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226 guarantee(_rs != NULL, "Requires an HRIntoG1RemSet"); |
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227 } |
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228 |
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229 void set_from(HeapRegion* from) { |
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230 assert(from != NULL, "from region must be non-NULL"); |
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231 _from = from; |
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232 } |
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233 |
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234 virtual void do_oop(narrowOop* p); |
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235 virtual void do_oop(oop* p); |
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236 |
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237 // Override: this closure is idempotent. |
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238 // bool idempotent() { return true; } |
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239 bool apply_to_weak_ref_discovered_field() { return true; } |
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240 }; |
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241 |