Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.hpp @ 12343:d55c004e1d4d
8025305: Cleanup CardTableModRefBS usage in G1
Summary: Move some G1 specific code from CardTableModRefBS to G1SATBCardTableModRefBS.
Reviewed-by: brutisso, tschatzl, ehelin
| author | mgerdin |
|---|---|
| date | Tue, 24 Sep 2013 14:46:29 +0200 |
| parents | 40136aa2cdb1 |
| children | 96b1c2e06e25 |
| rev | line source |
|---|---|
| 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_HEAPREGION_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
| 29 #include "gc_implementation/g1/g1_specialized_oop_closures.hpp" | |
| 30 #include "gc_implementation/g1/survRateGroup.hpp" | |
| 31 #include "gc_implementation/shared/ageTable.hpp" | |
| 32 #include "gc_implementation/shared/spaceDecorator.hpp" | |
| 33 #include "memory/space.inline.hpp" | |
| 34 #include "memory/watermark.hpp" | |
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35 #include "utilities/macros.hpp" |
| 1972 | 36 |
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37 #if INCLUDE_ALL_GCS |
| 342 | 38 |
| 39 // A HeapRegion is the smallest piece of a G1CollectedHeap that | |
| 40 // can be collected independently. | |
| 41 | |
| 42 // NOTE: Although a HeapRegion is a Space, its | |
| 43 // Space::initDirtyCardClosure method must not be called. | |
| 44 // The problem is that the existence of this method breaks | |
| 45 // the independence of barrier sets from remembered sets. | |
| 46 // The solution is to remove this method from the definition | |
| 47 // of a Space. | |
| 48 | |
| 49 class CompactibleSpace; | |
| 50 class ContiguousSpace; | |
| 51 class HeapRegionRemSet; | |
| 52 class HeapRegionRemSetIterator; | |
| 53 class HeapRegion; | |
| 2152 | 54 class HeapRegionSetBase; |
| 12080 | 55 class nmethod; |
| 2152 | 56 |
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57 #define HR_FORMAT "%u:(%s)["PTR_FORMAT","PTR_FORMAT","PTR_FORMAT"]" |
| 3766 | 58 #define HR_FORMAT_PARAMS(_hr_) \ |
| 59 (_hr_)->hrs_index(), \ | |
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60 (_hr_)->is_survivor() ? "S" : (_hr_)->is_young() ? "E" : \ |
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61 (_hr_)->startsHumongous() ? "HS" : \ |
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62 (_hr_)->continuesHumongous() ? "HC" : \ |
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63 !(_hr_)->is_empty() ? "O" : "F", \ |
| 3766 | 64 (_hr_)->bottom(), (_hr_)->top(), (_hr_)->end() |
| 342 | 65 |
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66 // sentinel value for hrs_index |
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67 #define G1_NULL_HRS_INDEX ((uint) -1) |
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68 |
| 342 | 69 // A dirty card to oop closure for heap regions. It |
| 70 // knows how to get the G1 heap and how to use the bitmap | |
| 71 // in the concurrent marker used by G1 to filter remembered | |
| 72 // sets. | |
| 73 | |
| 74 class HeapRegionDCTOC : public ContiguousSpaceDCTOC { | |
| 75 public: | |
| 76 // Specification of possible DirtyCardToOopClosure filtering. | |
| 77 enum FilterKind { | |
| 78 NoFilterKind, | |
| 79 IntoCSFilterKind, | |
| 80 OutOfRegionFilterKind | |
| 81 }; | |
| 82 | |
| 83 protected: | |
| 84 HeapRegion* _hr; | |
| 85 FilterKind _fk; | |
| 86 G1CollectedHeap* _g1; | |
| 87 | |
| 88 void walk_mem_region_with_cl(MemRegion mr, | |
| 89 HeapWord* bottom, HeapWord* top, | |
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90 ExtendedOopClosure* cl); |
| 342 | 91 |
| 92 // We don't specialize this for FilteringClosure; filtering is handled by | |
| 93 // the "FilterKind" mechanism. But we provide this to avoid a compiler | |
| 94 // warning. | |
| 95 void walk_mem_region_with_cl(MemRegion mr, | |
| 96 HeapWord* bottom, HeapWord* top, | |
| 97 FilteringClosure* cl) { | |
| 98 HeapRegionDCTOC::walk_mem_region_with_cl(mr, bottom, top, | |
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99 (ExtendedOopClosure*)cl); |
| 342 | 100 } |
| 101 | |
| 102 // Get the actual top of the area on which the closure will | |
| 103 // operate, given where the top is assumed to be (the end of the | |
| 104 // memory region passed to do_MemRegion) and where the object | |
| 105 // at the top is assumed to start. For example, an object may | |
| 106 // start at the top but actually extend past the assumed top, | |
| 107 // in which case the top becomes the end of the object. | |
| 108 HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj) { | |
| 109 return ContiguousSpaceDCTOC::get_actual_top(top, top_obj); | |
| 110 } | |
| 111 | |
| 112 // Walk the given memory region from bottom to (actual) top | |
| 113 // looking for objects and applying the oop closure (_cl) to | |
| 114 // them. The base implementation of this treats the area as | |
| 115 // blocks, where a block may or may not be an object. Sub- | |
| 116 // classes should override this to provide more accurate | |
| 117 // or possibly more efficient walking. | |
| 118 void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top) { | |
| 119 Filtering_DCTOC::walk_mem_region(mr, bottom, top); | |
| 120 } | |
| 121 | |
| 122 public: | |
| 123 HeapRegionDCTOC(G1CollectedHeap* g1, | |
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124 HeapRegion* hr, ExtendedOopClosure* cl, |
| 342 | 125 CardTableModRefBS::PrecisionStyle precision, |
| 126 FilterKind fk); | |
| 127 }; | |
| 128 | |
| 129 // The complicating factor is that BlockOffsetTable diverged | |
| 130 // significantly, and we need functionality that is only in the G1 version. | |
| 131 // So I copied that code, which led to an alternate G1 version of | |
| 132 // OffsetTableContigSpace. If the two versions of BlockOffsetTable could | |
| 133 // be reconciled, then G1OffsetTableContigSpace could go away. | |
| 134 | |
| 135 // The idea behind time stamps is the following. Doing a save_marks on | |
| 136 // all regions at every GC pause is time consuming (if I remember | |
| 137 // well, 10ms or so). So, we would like to do that only for regions | |
| 138 // that are GC alloc regions. To achieve this, we use time | |
| 139 // stamps. For every evacuation pause, G1CollectedHeap generates a | |
| 140 // unique time stamp (essentially a counter that gets | |
| 141 // incremented). Every time we want to call save_marks on a region, | |
| 142 // we set the saved_mark_word to top and also copy the current GC | |
| 143 // time stamp to the time stamp field of the space. Reading the | |
| 144 // saved_mark_word involves checking the time stamp of the | |
| 145 // region. If it is the same as the current GC time stamp, then we | |
| 146 // can safely read the saved_mark_word field, as it is valid. If the | |
| 147 // time stamp of the region is not the same as the current GC time | |
| 148 // stamp, then we instead read top, as the saved_mark_word field is | |
| 149 // invalid. Time stamps (on the regions and also on the | |
| 150 // G1CollectedHeap) are reset at every cleanup (we iterate over | |
| 151 // the regions anyway) and at the end of a Full GC. The current scheme | |
| 152 // that uses sequential unsigned ints will fail only if we have 4b | |
| 153 // evacuation pauses between two cleanups, which is _highly_ unlikely. | |
| 154 | |
| 155 class G1OffsetTableContigSpace: public ContiguousSpace { | |
| 156 friend class VMStructs; | |
| 157 protected: | |
| 158 G1BlockOffsetArrayContigSpace _offsets; | |
| 159 Mutex _par_alloc_lock; | |
| 160 volatile unsigned _gc_time_stamp; | |
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161 // When we need to retire an allocation region, while other threads |
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162 // are also concurrently trying to allocate into it, we typically |
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163 // allocate a dummy object at the end of the region to ensure that |
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164 // no more allocations can take place in it. However, sometimes we |
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165 // want to know where the end of the last "real" object we allocated |
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166 // into the region was and this is what this keeps track. |
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167 HeapWord* _pre_dummy_top; |
| 342 | 168 |
| 169 public: | |
| 170 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
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171 MemRegion mr); |
| 342 | 172 |
| 173 void set_bottom(HeapWord* value); | |
| 174 void set_end(HeapWord* value); | |
| 175 | |
| 176 virtual HeapWord* saved_mark_word() const; | |
| 177 virtual void set_saved_mark(); | |
| 178 void reset_gc_time_stamp() { _gc_time_stamp = 0; } | |
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179 unsigned get_gc_time_stamp() { return _gc_time_stamp; } |
| 342 | 180 |
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181 // See the comment above in the declaration of _pre_dummy_top for an |
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182 // explanation of what it is. |
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183 void set_pre_dummy_top(HeapWord* pre_dummy_top) { |
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184 assert(is_in(pre_dummy_top) && pre_dummy_top <= top(), "pre-condition"); |
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185 _pre_dummy_top = pre_dummy_top; |
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186 } |
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187 HeapWord* pre_dummy_top() { |
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188 return (_pre_dummy_top == NULL) ? top() : _pre_dummy_top; |
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189 } |
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190 void reset_pre_dummy_top() { _pre_dummy_top = NULL; } |
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191 |
| 356 | 192 virtual void clear(bool mangle_space); |
| 342 | 193 |
| 194 HeapWord* block_start(const void* p); | |
| 195 HeapWord* block_start_const(const void* p) const; | |
| 196 | |
| 197 // Add offset table update. | |
| 198 virtual HeapWord* allocate(size_t word_size); | |
| 199 HeapWord* par_allocate(size_t word_size); | |
| 200 | |
| 201 // MarkSweep support phase3 | |
| 202 virtual HeapWord* initialize_threshold(); | |
| 203 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
| 204 | |
| 205 virtual void print() const; | |
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206 |
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207 void reset_bot() { |
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208 _offsets.zero_bottom_entry(); |
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209 _offsets.initialize_threshold(); |
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210 } |
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211 |
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212 void update_bot_for_object(HeapWord* start, size_t word_size) { |
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213 _offsets.alloc_block(start, word_size); |
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214 } |
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215 |
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216 void print_bot_on(outputStream* out) { |
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217 _offsets.print_on(out); |
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218 } |
| 342 | 219 }; |
| 220 | |
| 221 class HeapRegion: public G1OffsetTableContigSpace { | |
| 222 friend class VMStructs; | |
| 223 private: | |
| 224 | |
| 355 | 225 enum HumongousType { |
| 226 NotHumongous = 0, | |
| 227 StartsHumongous, | |
| 228 ContinuesHumongous | |
| 229 }; | |
| 230 | |
| 342 | 231 // Requires that the region "mr" be dense with objects, and begin and end |
| 232 // with an object. | |
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233 void oops_in_mr_iterate(MemRegion mr, ExtendedOopClosure* cl); |
| 342 | 234 |
| 235 // The remembered set for this region. | |
| 236 // (Might want to make this "inline" later, to avoid some alloc failure | |
| 237 // issues.) | |
| 238 HeapRegionRemSet* _rem_set; | |
| 239 | |
| 240 G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } | |
| 241 | |
| 242 protected: | |
| 3766 | 243 // The index of this region in the heap region sequence. |
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244 uint _hrs_index; |
| 342 | 245 |
| 355 | 246 HumongousType _humongous_type; |
| 342 | 247 // For a humongous region, region in which it starts. |
| 248 HeapRegion* _humongous_start_region; | |
| 249 // For the start region of a humongous sequence, it's original end(). | |
| 250 HeapWord* _orig_end; | |
| 251 | |
| 252 // True iff the region is in current collection_set. | |
| 253 bool _in_collection_set; | |
| 254 | |
| 255 // True iff an attempt to evacuate an object in the region failed. | |
| 256 bool _evacuation_failed; | |
| 257 | |
| 258 // A heap region may be a member one of a number of special subsets, each | |
| 259 // represented as linked lists through the field below. Currently, these | |
| 260 // sets include: | |
| 261 // The collection set. | |
| 262 // The set of allocation regions used in a collection pause. | |
| 263 // Spaces that may contain gray objects. | |
| 264 HeapRegion* _next_in_special_set; | |
| 265 | |
| 266 // next region in the young "generation" region set | |
| 267 HeapRegion* _next_young_region; | |
| 268 | |
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269 // Next region whose cards need cleaning |
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270 HeapRegion* _next_dirty_cards_region; |
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271 |
| 2152 | 272 // Fields used by the HeapRegionSetBase class and subclasses. |
| 273 HeapRegion* _next; | |
| 274 #ifdef ASSERT | |
| 275 HeapRegionSetBase* _containing_set; | |
| 276 #endif // ASSERT | |
| 277 bool _pending_removal; | |
| 278 | |
| 342 | 279 // For parallel heapRegion traversal. |
| 280 jint _claimed; | |
| 281 | |
| 282 // We use concurrent marking to determine the amount of live data | |
| 283 // in each heap region. | |
| 284 size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. | |
| 285 size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. | |
| 286 | |
| 6011 | 287 // The calculated GC efficiency of the region. |
| 342 | 288 double _gc_efficiency; |
| 289 | |
| 290 enum YoungType { | |
| 291 NotYoung, // a region is not young | |
| 292 Young, // a region is young | |
| 3766 | 293 Survivor // a region is young and it contains survivors |
| 342 | 294 }; |
| 295 | |
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296 volatile YoungType _young_type; |
| 342 | 297 int _young_index_in_cset; |
| 298 SurvRateGroup* _surv_rate_group; | |
| 299 int _age_index; | |
| 300 | |
| 301 // The start of the unmarked area. The unmarked area extends from this | |
| 302 // word until the top and/or end of the region, and is the part | |
| 303 // of the region for which no marking was done, i.e. objects may | |
| 304 // have been allocated in this part since the last mark phase. | |
| 305 // "prev" is the top at the start of the last completed marking. | |
| 306 // "next" is the top at the start of the in-progress marking (if any.) | |
| 307 HeapWord* _prev_top_at_mark_start; | |
| 308 HeapWord* _next_top_at_mark_start; | |
| 309 // If a collection pause is in progress, this is the top at the start | |
| 310 // of that pause. | |
| 311 | |
| 312 void init_top_at_mark_start() { | |
| 313 assert(_prev_marked_bytes == 0 && | |
| 314 _next_marked_bytes == 0, | |
| 315 "Must be called after zero_marked_bytes."); | |
| 316 HeapWord* bot = bottom(); | |
| 317 _prev_top_at_mark_start = bot; | |
| 318 _next_top_at_mark_start = bot; | |
| 319 } | |
| 320 | |
| 321 void set_young_type(YoungType new_type) { | |
| 322 //assert(_young_type != new_type, "setting the same type" ); | |
| 323 // TODO: add more assertions here | |
| 324 _young_type = new_type; | |
| 325 } | |
| 326 | |
|
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327 // Cached attributes used in the collection set policy information |
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328 |
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329 // The RSet length that was added to the total value |
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330 // for the collection set. |
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331 size_t _recorded_rs_length; |
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332 |
|
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333 // The predicted elapsed time that was added to total value |
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334 // for the collection set. |
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335 double _predicted_elapsed_time_ms; |
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336 |
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337 // The predicted number of bytes to copy that was added to |
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338 // the total value for the collection set. |
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339 size_t _predicted_bytes_to_copy; |
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340 |
| 342 | 341 public: |
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342 HeapRegion(uint hrs_index, |
| 3766 | 343 G1BlockOffsetSharedArray* sharedOffsetArray, |
|
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344 MemRegion mr); |
| 342 | 345 |
|
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346 static int LogOfHRGrainBytes; |
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347 static int LogOfHRGrainWords; |
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348 |
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349 static size_t GrainBytes; |
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350 static size_t GrainWords; |
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351 static size_t CardsPerRegion; |
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352 |
|
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353 static size_t align_up_to_region_byte_size(size_t sz) { |
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354 return (sz + (size_t) GrainBytes - 1) & |
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355 ~((1 << (size_t) LogOfHRGrainBytes) - 1); |
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356 } |
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357 |
|
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358 static size_t max_region_size(); |
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359 |
|
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360 // It sets up the heap region size (GrainBytes / GrainWords), as |
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361 // well as other related fields that are based on the heap region |
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362 // size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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363 // CardsPerRegion). All those fields are considered constant |
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364 // throughout the JVM's execution, therefore they should only be set |
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365 // up once during initialization time. |
|
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366 static void setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size); |
| 342 | 367 |
| 355 | 368 enum ClaimValues { |
|
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369 InitialClaimValue = 0, |
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370 FinalCountClaimValue = 1, |
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371 NoteEndClaimValue = 2, |
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372 ScrubRemSetClaimValue = 3, |
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373 ParVerifyClaimValue = 4, |
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374 RebuildRSClaimValue = 5, |
|
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375 ParEvacFailureClaimValue = 6, |
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376 AggregateCountClaimValue = 7, |
| 12080 | 377 VerifyCountClaimValue = 8, |
| 378 ParMarkRootClaimValue = 9 | |
| 355 | 379 }; |
| 380 | |
|
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381 inline HeapWord* par_allocate_no_bot_updates(size_t word_size) { |
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382 assert(is_young(), "we can only skip BOT updates on young regions"); |
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383 return ContiguousSpace::par_allocate(word_size); |
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384 } |
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385 inline HeapWord* allocate_no_bot_updates(size_t word_size) { |
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386 assert(is_young(), "we can only skip BOT updates on young regions"); |
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387 return ContiguousSpace::allocate(word_size); |
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388 } |
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389 |
| 342 | 390 // If this region is a member of a HeapRegionSeq, the index in that |
| 391 // sequence, otherwise -1. | |
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392 uint hrs_index() const { return _hrs_index; } |
| 342 | 393 |
| 394 // The number of bytes marked live in the region in the last marking phase. | |
| 395 size_t marked_bytes() { return _prev_marked_bytes; } | |
|
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396 size_t live_bytes() { |
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397 return (top() - prev_top_at_mark_start()) * HeapWordSize + marked_bytes(); |
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398 } |
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399 |
| 342 | 400 // The number of bytes counted in the next marking. |
| 401 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 402 // The number of bytes live wrt the next marking. | |
| 403 size_t next_live_bytes() { | |
|
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404 return |
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405 (top() - next_top_at_mark_start()) * HeapWordSize + next_marked_bytes(); |
| 342 | 406 } |
| 407 | |
| 408 // A lower bound on the amount of garbage bytes in the region. | |
| 409 size_t garbage_bytes() { | |
| 410 size_t used_at_mark_start_bytes = | |
| 411 (prev_top_at_mark_start() - bottom()) * HeapWordSize; | |
| 412 assert(used_at_mark_start_bytes >= marked_bytes(), | |
| 413 "Can't mark more than we have."); | |
| 414 return used_at_mark_start_bytes - marked_bytes(); | |
| 415 } | |
| 416 | |
|
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417 // Return the amount of bytes we'll reclaim if we collect this |
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418 // region. This includes not only the known garbage bytes in the |
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419 // region but also any unallocated space in it, i.e., [top, end), |
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420 // since it will also be reclaimed if we collect the region. |
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421 size_t reclaimable_bytes() { |
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422 size_t known_live_bytes = live_bytes(); |
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423 assert(known_live_bytes <= capacity(), "sanity"); |
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424 return capacity() - known_live_bytes; |
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425 } |
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426 |
| 342 | 427 // An upper bound on the number of live bytes in the region. |
| 428 size_t max_live_bytes() { return used() - garbage_bytes(); } | |
| 429 | |
| 430 void add_to_marked_bytes(size_t incr_bytes) { | |
| 431 _next_marked_bytes = _next_marked_bytes + incr_bytes; | |
|
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432 assert(_next_marked_bytes <= used(), "invariant" ); |
| 342 | 433 } |
| 434 | |
| 435 void zero_marked_bytes() { | |
| 436 _prev_marked_bytes = _next_marked_bytes = 0; | |
| 437 } | |
| 438 | |
| 355 | 439 bool isHumongous() const { return _humongous_type != NotHumongous; } |
| 440 bool startsHumongous() const { return _humongous_type == StartsHumongous; } | |
| 441 bool continuesHumongous() const { return _humongous_type == ContinuesHumongous; } | |
| 342 | 442 // For a humongous region, region in which it starts. |
| 443 HeapRegion* humongous_start_region() const { | |
| 444 return _humongous_start_region; | |
| 445 } | |
| 446 | |
|
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447 // Return the number of distinct regions that are covered by this region: |
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448 // 1 if the region is not humongous, >= 1 if the region is humongous. |
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449 uint region_num() const { |
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450 if (!isHumongous()) { |
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451 return 1U; |
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452 } else { |
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453 assert(startsHumongous(), "doesn't make sense on HC regions"); |
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454 assert(capacity() % HeapRegion::GrainBytes == 0, "sanity"); |
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455 return (uint) (capacity() >> HeapRegion::LogOfHRGrainBytes); |
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456 } |
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457 } |
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458 |
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459 // Return the index + 1 of the last HC regions that's associated |
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460 // with this HS region. |
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461 uint last_hc_index() const { |
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462 assert(startsHumongous(), "don't call this otherwise"); |
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463 return hrs_index() + region_num(); |
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464 } |
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465 |
|
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466 // Same as Space::is_in_reserved, but will use the original size of the region. |
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467 // The original size is different only for start humongous regions. They get |
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468 // their _end set up to be the end of the last continues region of the |
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469 // corresponding humongous object. |
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470 bool is_in_reserved_raw(const void* p) const { |
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471 return _bottom <= p && p < _orig_end; |
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472 } |
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473 |
|
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474 // Makes the current region be a "starts humongous" region, i.e., |
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475 // the first region in a series of one or more contiguous regions |
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476 // that will contain a single "humongous" object. The two parameters |
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477 // are as follows: |
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478 // |
|
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479 // new_top : The new value of the top field of this region which |
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480 // points to the end of the humongous object that's being |
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481 // allocated. If there is more than one region in the series, top |
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482 // will lie beyond this region's original end field and on the last |
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483 // region in the series. |
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484 // |
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485 // new_end : The new value of the end field of this region which |
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486 // points to the end of the last region in the series. If there is |
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487 // one region in the series (namely: this one) end will be the same |
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488 // as the original end of this region. |
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489 // |
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490 // Updating top and end as described above makes this region look as |
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491 // if it spans the entire space taken up by all the regions in the |
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492 // series and an single allocation moved its top to new_top. This |
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493 // ensures that the space (capacity / allocated) taken up by all |
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494 // humongous regions can be calculated by just looking at the |
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495 // "starts humongous" regions and by ignoring the "continues |
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496 // humongous" regions. |
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497 void set_startsHumongous(HeapWord* new_top, HeapWord* new_end); |
| 342 | 498 |
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499 // Makes the current region be a "continues humongous' |
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500 // region. first_hr is the "start humongous" region of the series |
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501 // which this region will be part of. |
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502 void set_continuesHumongous(HeapRegion* first_hr); |
| 342 | 503 |
| 2152 | 504 // Unsets the humongous-related fields on the region. |
| 505 void set_notHumongous(); | |
| 506 | |
| 342 | 507 // If the region has a remembered set, return a pointer to it. |
| 508 HeapRegionRemSet* rem_set() const { | |
| 509 return _rem_set; | |
| 510 } | |
| 511 | |
| 512 // True iff the region is in current collection_set. | |
| 513 bool in_collection_set() const { | |
| 514 return _in_collection_set; | |
| 515 } | |
| 516 void set_in_collection_set(bool b) { | |
| 517 _in_collection_set = b; | |
| 518 } | |
| 519 HeapRegion* next_in_collection_set() { | |
| 520 assert(in_collection_set(), "should only invoke on member of CS."); | |
| 521 assert(_next_in_special_set == NULL || | |
| 522 _next_in_special_set->in_collection_set(), | |
| 523 "Malformed CS."); | |
| 524 return _next_in_special_set; | |
| 525 } | |
| 526 void set_next_in_collection_set(HeapRegion* r) { | |
| 527 assert(in_collection_set(), "should only invoke on member of CS."); | |
| 528 assert(r == NULL || r->in_collection_set(), "Malformed CS."); | |
| 529 _next_in_special_set = r; | |
| 530 } | |
| 531 | |
| 2152 | 532 // Methods used by the HeapRegionSetBase class and subclasses. |
| 342 | 533 |
| 2152 | 534 // Getter and setter for the next field used to link regions into |
| 535 // linked lists. | |
| 536 HeapRegion* next() { return _next; } | |
| 537 | |
| 538 void set_next(HeapRegion* next) { _next = next; } | |
| 342 | 539 |
| 2152 | 540 // Every region added to a set is tagged with a reference to that |
| 541 // set. This is used for doing consistency checking to make sure that | |
| 542 // the contents of a set are as they should be and it's only | |
| 543 // available in non-product builds. | |
| 544 #ifdef ASSERT | |
| 545 void set_containing_set(HeapRegionSetBase* containing_set) { | |
| 546 assert((containing_set == NULL && _containing_set != NULL) || | |
| 547 (containing_set != NULL && _containing_set == NULL), | |
| 548 err_msg("containing_set: "PTR_FORMAT" " | |
| 549 "_containing_set: "PTR_FORMAT, | |
| 550 containing_set, _containing_set)); | |
| 551 | |
| 552 _containing_set = containing_set; | |
| 2361 | 553 } |
| 342 | 554 |
| 2152 | 555 HeapRegionSetBase* containing_set() { return _containing_set; } |
| 556 #else // ASSERT | |
| 557 void set_containing_set(HeapRegionSetBase* containing_set) { } | |
| 342 | 558 |
| 2361 | 559 // containing_set() is only used in asserts so there's no reason |
| 2152 | 560 // to provide a dummy version of it. |
| 561 #endif // ASSERT | |
| 342 | 562 |
| 2152 | 563 // If we want to remove regions from a list in bulk we can simply tag |
| 564 // them with the pending_removal tag and call the | |
| 565 // remove_all_pending() method on the list. | |
| 342 | 566 |
| 2152 | 567 bool pending_removal() { return _pending_removal; } |
| 568 | |
| 569 void set_pending_removal(bool pending_removal) { | |
| 2361 | 570 if (pending_removal) { |
| 571 assert(!_pending_removal && containing_set() != NULL, | |
| 572 "can only set pending removal to true if it's false and " | |
| 573 "the region belongs to a region set"); | |
| 574 } else { | |
| 575 assert( _pending_removal && containing_set() == NULL, | |
| 576 "can only set pending removal to false if it's true and " | |
| 577 "the region does not belong to a region set"); | |
| 578 } | |
| 2152 | 579 |
| 580 _pending_removal = pending_removal; | |
| 342 | 581 } |
| 582 | |
| 583 HeapRegion* get_next_young_region() { return _next_young_region; } | |
| 584 void set_next_young_region(HeapRegion* hr) { | |
| 585 _next_young_region = hr; | |
| 586 } | |
| 587 | |
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588 HeapRegion* get_next_dirty_cards_region() const { return _next_dirty_cards_region; } |
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589 HeapRegion** next_dirty_cards_region_addr() { return &_next_dirty_cards_region; } |
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590 void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; } |
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591 bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; } |
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592 |
| 3766 | 593 HeapWord* orig_end() { return _orig_end; } |
| 594 | |
| 342 | 595 // Allows logical separation between objects allocated before and after. |
| 596 void save_marks(); | |
| 597 | |
| 598 // Reset HR stuff to default values. | |
| 599 void hr_clear(bool par, bool clear_space); | |
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600 void par_clear(); |
| 342 | 601 |
| 602 // Get the start of the unmarked area in this region. | |
| 603 HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } | |
| 604 HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } | |
| 605 | |
| 606 // Apply "cl->do_oop" to (the addresses of) all reference fields in objects | |
| 607 // allocated in the current region before the last call to "save_mark". | |
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608 void oop_before_save_marks_iterate(ExtendedOopClosure* cl); |
| 342 | 609 |
| 610 // Note the start or end of marking. This tells the heap region | |
| 611 // that the collector is about to start or has finished (concurrently) | |
| 612 // marking the heap. | |
| 613 | |
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614 // Notify the region that concurrent marking is starting. Initialize |
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615 // all fields related to the next marking info. |
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616 inline void note_start_of_marking(); |
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617 |
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618 // Notify the region that concurrent marking has finished. Copy the |
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619 // (now finalized) next marking info fields into the prev marking |
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620 // info fields. |
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621 inline void note_end_of_marking(); |
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622 |
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623 // Notify the region that it will be used as to-space during a GC |
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624 // and we are about to start copying objects into it. |
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625 inline void note_start_of_copying(bool during_initial_mark); |
| 342 | 626 |
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627 // Notify the region that it ceases being to-space during a GC and |
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628 // we will not copy objects into it any more. |
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629 inline void note_end_of_copying(bool during_initial_mark); |
| 342 | 630 |
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631 // Notify the region that we are about to start processing |
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632 // self-forwarded objects during evac failure handling. |
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633 void note_self_forwarding_removal_start(bool during_initial_mark, |
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634 bool during_conc_mark); |
| 342 | 635 |
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636 // Notify the region that we have finished processing self-forwarded |
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637 // objects during evac failure handling. |
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638 void note_self_forwarding_removal_end(bool during_initial_mark, |
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639 bool during_conc_mark, |
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640 size_t marked_bytes); |
| 342 | 641 |
| 642 // Returns "false" iff no object in the region was allocated when the | |
| 643 // last mark phase ended. | |
| 644 bool is_marked() { return _prev_top_at_mark_start != bottom(); } | |
| 645 | |
| 646 void reset_during_compaction() { | |
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647 assert(isHumongous() && startsHumongous(), |
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648 "should only be called for starts humongous regions"); |
| 342 | 649 |
| 650 zero_marked_bytes(); | |
| 651 init_top_at_mark_start(); | |
| 652 } | |
| 653 | |
| 654 void calc_gc_efficiency(void); | |
| 655 double gc_efficiency() { return _gc_efficiency;} | |
| 656 | |
| 657 bool is_young() const { return _young_type != NotYoung; } | |
| 658 bool is_survivor() const { return _young_type == Survivor; } | |
| 659 | |
| 660 int young_index_in_cset() const { return _young_index_in_cset; } | |
| 661 void set_young_index_in_cset(int index) { | |
| 662 assert( (index == -1) || is_young(), "pre-condition" ); | |
| 663 _young_index_in_cset = index; | |
| 664 } | |
| 665 | |
| 666 int age_in_surv_rate_group() { | |
| 667 assert( _surv_rate_group != NULL, "pre-condition" ); | |
| 668 assert( _age_index > -1, "pre-condition" ); | |
| 669 return _surv_rate_group->age_in_group(_age_index); | |
| 670 } | |
| 671 | |
| 672 void record_surv_words_in_group(size_t words_survived) { | |
| 673 assert( _surv_rate_group != NULL, "pre-condition" ); | |
| 674 assert( _age_index > -1, "pre-condition" ); | |
| 675 int age_in_group = age_in_surv_rate_group(); | |
| 676 _surv_rate_group->record_surviving_words(age_in_group, words_survived); | |
| 677 } | |
| 678 | |
| 679 int age_in_surv_rate_group_cond() { | |
| 680 if (_surv_rate_group != NULL) | |
| 681 return age_in_surv_rate_group(); | |
| 682 else | |
| 683 return -1; | |
| 684 } | |
| 685 | |
| 686 SurvRateGroup* surv_rate_group() { | |
| 687 return _surv_rate_group; | |
| 688 } | |
| 689 | |
| 690 void install_surv_rate_group(SurvRateGroup* surv_rate_group) { | |
| 691 assert( surv_rate_group != NULL, "pre-condition" ); | |
| 692 assert( _surv_rate_group == NULL, "pre-condition" ); | |
| 693 assert( is_young(), "pre-condition" ); | |
| 694 | |
| 695 _surv_rate_group = surv_rate_group; | |
| 696 _age_index = surv_rate_group->next_age_index(); | |
| 697 } | |
| 698 | |
| 699 void uninstall_surv_rate_group() { | |
| 700 if (_surv_rate_group != NULL) { | |
| 701 assert( _age_index > -1, "pre-condition" ); | |
| 702 assert( is_young(), "pre-condition" ); | |
| 703 | |
| 704 _surv_rate_group = NULL; | |
| 705 _age_index = -1; | |
| 706 } else { | |
| 707 assert( _age_index == -1, "pre-condition" ); | |
| 708 } | |
| 709 } | |
| 710 | |
| 711 void set_young() { set_young_type(Young); } | |
| 712 | |
| 713 void set_survivor() { set_young_type(Survivor); } | |
| 714 | |
| 715 void set_not_young() { set_young_type(NotYoung); } | |
| 716 | |
| 717 // Determine if an object has been allocated since the last | |
| 718 // mark performed by the collector. This returns true iff the object | |
| 719 // is within the unmarked area of the region. | |
| 720 bool obj_allocated_since_prev_marking(oop obj) const { | |
| 721 return (HeapWord *) obj >= prev_top_at_mark_start(); | |
| 722 } | |
| 723 bool obj_allocated_since_next_marking(oop obj) const { | |
| 724 return (HeapWord *) obj >= next_top_at_mark_start(); | |
| 725 } | |
| 726 | |
| 727 // For parallel heapRegion traversal. | |
| 728 bool claimHeapRegion(int claimValue); | |
| 729 jint claim_value() { return _claimed; } | |
| 730 // Use this carefully: only when you're sure no one is claiming... | |
| 731 void set_claim_value(int claimValue) { _claimed = claimValue; } | |
| 732 | |
| 733 // Returns the "evacuation_failed" property of the region. | |
| 734 bool evacuation_failed() { return _evacuation_failed; } | |
| 735 | |
| 736 // Sets the "evacuation_failed" property of the region. | |
| 737 void set_evacuation_failed(bool b) { | |
| 738 _evacuation_failed = b; | |
| 739 | |
| 740 if (b) { | |
| 741 _next_marked_bytes = 0; | |
| 742 } | |
| 743 } | |
| 744 | |
| 745 // Requires that "mr" be entirely within the region. | |
| 746 // Apply "cl->do_object" to all objects that intersect with "mr". | |
| 747 // If the iteration encounters an unparseable portion of the region, | |
| 748 // or if "cl->abort()" is true after a closure application, | |
| 749 // terminate the iteration and return the address of the start of the | |
| 750 // subregion that isn't done. (The two can be distinguished by querying | |
| 751 // "cl->abort()".) Return of "NULL" indicates that the iteration | |
| 752 // completed. | |
| 753 HeapWord* | |
| 754 object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); | |
| 755 | |
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756 // filter_young: if true and the region is a young region then we |
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757 // skip the iteration. |
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758 // card_ptr: if not NULL, and we decide that the card is not young |
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759 // and we iterate over it, we'll clean the card before we start the |
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760 // iteration. |
| 342 | 761 HeapWord* |
| 762 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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763 FilterOutOfRegionClosure* cl, |
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764 bool filter_young, |
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765 jbyte* card_ptr); |
| 342 | 766 |
| 767 // A version of block start that is guaranteed to find *some* block | |
| 768 // boundary at or before "p", but does not object iteration, and may | |
| 769 // therefore be used safely when the heap is unparseable. | |
| 770 HeapWord* block_start_careful(const void* p) const { | |
| 771 return _offsets.block_start_careful(p); | |
| 772 } | |
| 773 | |
| 774 // Requires that "addr" is within the region. Returns the start of the | |
| 775 // first ("careful") block that starts at or after "addr", or else the | |
| 776 // "end" of the region if there is no such block. | |
| 777 HeapWord* next_block_start_careful(HeapWord* addr); | |
| 778 | |
|
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779 size_t recorded_rs_length() const { return _recorded_rs_length; } |
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780 double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; } |
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781 size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; } |
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782 |
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783 void set_recorded_rs_length(size_t rs_length) { |
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784 _recorded_rs_length = rs_length; |
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785 } |
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786 |
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787 void set_predicted_elapsed_time_ms(double ms) { |
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788 _predicted_elapsed_time_ms = ms; |
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789 } |
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790 |
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791 void set_predicted_bytes_to_copy(size_t bytes) { |
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792 _predicted_bytes_to_copy = bytes; |
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793 } |
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794 |
| 342 | 795 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ |
| 796 virtual void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
| 797 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DECL) | |
| 798 | |
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799 virtual CompactibleSpace* next_compaction_space() const; |
| 342 | 800 |
| 801 virtual void reset_after_compaction(); | |
| 802 | |
| 12080 | 803 // Routines for managing a list of code roots (attached to the |
| 804 // this region's RSet) that point into this heap region. | |
| 805 void add_strong_code_root(nmethod* nm); | |
| 806 void remove_strong_code_root(nmethod* nm); | |
| 807 | |
| 808 // During a collection, migrate the successfully evacuated | |
| 809 // strong code roots that referenced into this region to the | |
| 810 // new regions that they now point into. Unsuccessfully | |
| 811 // evacuated code roots are not migrated. | |
| 812 void migrate_strong_code_roots(); | |
| 813 | |
| 814 // Applies blk->do_code_blob() to each of the entries in | |
| 815 // the strong code roots list for this region | |
| 816 void strong_code_roots_do(CodeBlobClosure* blk) const; | |
| 817 | |
| 818 // Verify that the entries on the strong code root list for this | |
| 819 // region are live and include at least one pointer into this region. | |
| 820 void verify_strong_code_roots(VerifyOption vo, bool* failures) const; | |
| 821 | |
| 342 | 822 void print() const; |
| 823 void print_on(outputStream* st) const; | |
| 824 | |
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825 // vo == UsePrevMarking -> use "prev" marking information, |
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826 // vo == UseNextMarking -> use "next" marking information |
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827 // vo == UseMarkWord -> use the mark word in the object header |
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828 // |
| 811 | 829 // NOTE: Only the "prev" marking information is guaranteed to be |
| 830 // consistent most of the time, so most calls to this should use | |
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831 // vo == UsePrevMarking. |
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832 // Currently, there is only one case where this is called with |
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833 // vo == UseNextMarking, which is to verify the "next" marking |
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834 // information at the end of remark. |
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835 // Currently there is only one place where this is called with |
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836 // vo == UseMarkWord, which is to verify the marking during a |
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837 // full GC. |
| 6008 | 838 void verify(VerifyOption vo, bool *failures) const; |
| 811 | 839 |
| 840 // Override; it uses the "prev" marking information | |
| 6008 | 841 virtual void verify() const; |
| 342 | 842 }; |
| 843 | |
| 844 // HeapRegionClosure is used for iterating over regions. | |
| 845 // Terminates the iteration when the "doHeapRegion" method returns "true". | |
| 846 class HeapRegionClosure : public StackObj { | |
| 847 friend class HeapRegionSeq; | |
| 848 friend class G1CollectedHeap; | |
| 849 | |
| 850 bool _complete; | |
| 851 void incomplete() { _complete = false; } | |
| 852 | |
| 853 public: | |
| 854 HeapRegionClosure(): _complete(true) {} | |
| 855 | |
| 856 // Typically called on each region until it returns true. | |
| 857 virtual bool doHeapRegion(HeapRegion* r) = 0; | |
| 858 | |
| 859 // True after iteration if the closure was applied to all heap regions | |
| 860 // and returned "false" in all cases. | |
| 861 bool complete() { return _complete; } | |
| 862 }; | |
| 863 | |
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864 #endif // INCLUDE_ALL_GCS |
| 1972 | 865 |
| 866 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |