Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.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 | db9981fd3124 |
| children | 5888334c9c24 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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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_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; |
| 55 | |
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56 #define HR_FORMAT "%u:(%s)["PTR_FORMAT","PTR_FORMAT","PTR_FORMAT"]" |
| 3766 | 57 #define HR_FORMAT_PARAMS(_hr_) \ |
| 58 (_hr_)->hrs_index(), \ | |
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59 (_hr_)->is_survivor() ? "S" : (_hr_)->is_young() ? "E" : \ |
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60 (_hr_)->startsHumongous() ? "HS" : \ |
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61 (_hr_)->continuesHumongous() ? "HC" : \ |
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62 !(_hr_)->is_empty() ? "O" : "F", \ |
| 3766 | 63 (_hr_)->bottom(), (_hr_)->top(), (_hr_)->end() |
| 342 | 64 |
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65 // sentinel value for hrs_index |
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66 #define G1_NULL_HRS_INDEX ((uint) -1) |
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67 |
| 342 | 68 // A dirty card to oop closure for heap regions. It |
| 69 // knows how to get the G1 heap and how to use the bitmap | |
| 70 // in the concurrent marker used by G1 to filter remembered | |
| 71 // sets. | |
| 72 | |
| 73 class HeapRegionDCTOC : public ContiguousSpaceDCTOC { | |
| 74 public: | |
| 75 // Specification of possible DirtyCardToOopClosure filtering. | |
| 76 enum FilterKind { | |
| 77 NoFilterKind, | |
| 78 IntoCSFilterKind, | |
| 79 OutOfRegionFilterKind | |
| 80 }; | |
| 81 | |
| 82 protected: | |
| 83 HeapRegion* _hr; | |
| 84 FilterKind _fk; | |
| 85 G1CollectedHeap* _g1; | |
| 86 | |
| 87 void walk_mem_region_with_cl(MemRegion mr, | |
| 88 HeapWord* bottom, HeapWord* top, | |
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89 ExtendedOopClosure* cl); |
| 342 | 90 |
| 91 // We don't specialize this for FilteringClosure; filtering is handled by | |
| 92 // the "FilterKind" mechanism. But we provide this to avoid a compiler | |
| 93 // warning. | |
| 94 void walk_mem_region_with_cl(MemRegion mr, | |
| 95 HeapWord* bottom, HeapWord* top, | |
| 96 FilteringClosure* cl) { | |
| 97 HeapRegionDCTOC::walk_mem_region_with_cl(mr, bottom, top, | |
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98 (ExtendedOopClosure*)cl); |
| 342 | 99 } |
| 100 | |
| 101 // Get the actual top of the area on which the closure will | |
| 102 // operate, given where the top is assumed to be (the end of the | |
| 103 // memory region passed to do_MemRegion) and where the object | |
| 104 // at the top is assumed to start. For example, an object may | |
| 105 // start at the top but actually extend past the assumed top, | |
| 106 // in which case the top becomes the end of the object. | |
| 107 HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj) { | |
| 108 return ContiguousSpaceDCTOC::get_actual_top(top, top_obj); | |
| 109 } | |
| 110 | |
| 111 // Walk the given memory region from bottom to (actual) top | |
| 112 // looking for objects and applying the oop closure (_cl) to | |
| 113 // them. The base implementation of this treats the area as | |
| 114 // blocks, where a block may or may not be an object. Sub- | |
| 115 // classes should override this to provide more accurate | |
| 116 // or possibly more efficient walking. | |
| 117 void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top) { | |
| 118 Filtering_DCTOC::walk_mem_region(mr, bottom, top); | |
| 119 } | |
| 120 | |
| 121 public: | |
| 122 HeapRegionDCTOC(G1CollectedHeap* g1, | |
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123 HeapRegion* hr, ExtendedOopClosure* cl, |
| 342 | 124 CardTableModRefBS::PrecisionStyle precision, |
| 125 FilterKind fk); | |
| 126 }; | |
| 127 | |
| 128 // The complicating factor is that BlockOffsetTable diverged | |
| 129 // significantly, and we need functionality that is only in the G1 version. | |
| 130 // So I copied that code, which led to an alternate G1 version of | |
| 131 // OffsetTableContigSpace. If the two versions of BlockOffsetTable could | |
| 132 // be reconciled, then G1OffsetTableContigSpace could go away. | |
| 133 | |
| 134 // The idea behind time stamps is the following. Doing a save_marks on | |
| 135 // all regions at every GC pause is time consuming (if I remember | |
| 136 // well, 10ms or so). So, we would like to do that only for regions | |
| 137 // that are GC alloc regions. To achieve this, we use time | |
| 138 // stamps. For every evacuation pause, G1CollectedHeap generates a | |
| 139 // unique time stamp (essentially a counter that gets | |
| 140 // incremented). Every time we want to call save_marks on a region, | |
| 141 // we set the saved_mark_word to top and also copy the current GC | |
| 142 // time stamp to the time stamp field of the space. Reading the | |
| 143 // saved_mark_word involves checking the time stamp of the | |
| 144 // region. If it is the same as the current GC time stamp, then we | |
| 145 // can safely read the saved_mark_word field, as it is valid. If the | |
| 146 // time stamp of the region is not the same as the current GC time | |
| 147 // stamp, then we instead read top, as the saved_mark_word field is | |
| 148 // invalid. Time stamps (on the regions and also on the | |
| 149 // G1CollectedHeap) are reset at every cleanup (we iterate over | |
| 150 // the regions anyway) and at the end of a Full GC. The current scheme | |
| 151 // that uses sequential unsigned ints will fail only if we have 4b | |
| 152 // evacuation pauses between two cleanups, which is _highly_ unlikely. | |
| 153 | |
| 154 class G1OffsetTableContigSpace: public ContiguousSpace { | |
| 155 friend class VMStructs; | |
| 156 protected: | |
| 157 G1BlockOffsetArrayContigSpace _offsets; | |
| 158 Mutex _par_alloc_lock; | |
| 159 volatile unsigned _gc_time_stamp; | |
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160 // When we need to retire an allocation region, while other threads |
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161 // are also concurrently trying to allocate into it, we typically |
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162 // allocate a dummy object at the end of the region to ensure that |
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163 // no more allocations can take place in it. However, sometimes we |
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164 // want to know where the end of the last "real" object we allocated |
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165 // into the region was and this is what this keeps track. |
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166 HeapWord* _pre_dummy_top; |
| 342 | 167 |
| 168 public: | |
| 169 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
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170 MemRegion mr); |
| 342 | 171 |
| 172 void set_bottom(HeapWord* value); | |
| 173 void set_end(HeapWord* value); | |
| 174 | |
| 175 virtual HeapWord* saved_mark_word() const; | |
| 176 virtual void set_saved_mark(); | |
| 177 void reset_gc_time_stamp() { _gc_time_stamp = 0; } | |
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178 unsigned get_gc_time_stamp() { return _gc_time_stamp; } |
| 342 | 179 |
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180 // See the comment above in the declaration of _pre_dummy_top for an |
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181 // explanation of what it is. |
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182 void set_pre_dummy_top(HeapWord* pre_dummy_top) { |
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183 assert(is_in(pre_dummy_top) && pre_dummy_top <= top(), "pre-condition"); |
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184 _pre_dummy_top = pre_dummy_top; |
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185 } |
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186 HeapWord* pre_dummy_top() { |
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187 return (_pre_dummy_top == NULL) ? top() : _pre_dummy_top; |
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188 } |
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189 void reset_pre_dummy_top() { _pre_dummy_top = NULL; } |
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190 |
| 356 | 191 virtual void clear(bool mangle_space); |
| 342 | 192 |
| 193 HeapWord* block_start(const void* p); | |
| 194 HeapWord* block_start_const(const void* p) const; | |
| 195 | |
| 196 // Add offset table update. | |
| 197 virtual HeapWord* allocate(size_t word_size); | |
| 198 HeapWord* par_allocate(size_t word_size); | |
| 199 | |
| 200 // MarkSweep support phase3 | |
| 201 virtual HeapWord* initialize_threshold(); | |
| 202 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
| 203 | |
| 204 virtual void print() const; | |
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205 |
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206 void reset_bot() { |
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207 _offsets.zero_bottom_entry(); |
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208 _offsets.initialize_threshold(); |
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209 } |
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210 |
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211 void update_bot_for_object(HeapWord* start, size_t word_size) { |
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212 _offsets.alloc_block(start, word_size); |
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213 } |
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214 |
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215 void print_bot_on(outputStream* out) { |
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216 _offsets.print_on(out); |
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217 } |
| 342 | 218 }; |
| 219 | |
| 220 class HeapRegion: public G1OffsetTableContigSpace { | |
| 221 friend class VMStructs; | |
| 222 private: | |
| 223 | |
| 355 | 224 enum HumongousType { |
| 225 NotHumongous = 0, | |
| 226 StartsHumongous, | |
| 227 ContinuesHumongous | |
| 228 }; | |
| 229 | |
| 342 | 230 // Requires that the region "mr" be dense with objects, and begin and end |
| 231 // with an object. | |
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232 void oops_in_mr_iterate(MemRegion mr, ExtendedOopClosure* cl); |
| 342 | 233 |
| 234 // The remembered set for this region. | |
| 235 // (Might want to make this "inline" later, to avoid some alloc failure | |
| 236 // issues.) | |
| 237 HeapRegionRemSet* _rem_set; | |
| 238 | |
| 239 G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } | |
| 240 | |
| 241 protected: | |
| 3766 | 242 // The index of this region in the heap region sequence. |
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243 uint _hrs_index; |
| 342 | 244 |
| 355 | 245 HumongousType _humongous_type; |
| 342 | 246 // For a humongous region, region in which it starts. |
| 247 HeapRegion* _humongous_start_region; | |
| 248 // For the start region of a humongous sequence, it's original end(). | |
| 249 HeapWord* _orig_end; | |
| 250 | |
| 251 // True iff the region is in current collection_set. | |
| 252 bool _in_collection_set; | |
| 253 | |
| 254 // True iff an attempt to evacuate an object in the region failed. | |
| 255 bool _evacuation_failed; | |
| 256 | |
| 257 // A heap region may be a member one of a number of special subsets, each | |
| 258 // represented as linked lists through the field below. Currently, these | |
| 259 // sets include: | |
| 260 // The collection set. | |
| 261 // The set of allocation regions used in a collection pause. | |
| 262 // Spaces that may contain gray objects. | |
| 263 HeapRegion* _next_in_special_set; | |
| 264 | |
| 265 // next region in the young "generation" region set | |
| 266 HeapRegion* _next_young_region; | |
| 267 | |
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268 // Next region whose cards need cleaning |
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269 HeapRegion* _next_dirty_cards_region; |
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270 |
| 2152 | 271 // Fields used by the HeapRegionSetBase class and subclasses. |
| 272 HeapRegion* _next; | |
| 273 #ifdef ASSERT | |
| 274 HeapRegionSetBase* _containing_set; | |
| 275 #endif // ASSERT | |
| 276 bool _pending_removal; | |
| 277 | |
| 342 | 278 // For parallel heapRegion traversal. |
| 279 jint _claimed; | |
| 280 | |
| 281 // We use concurrent marking to determine the amount of live data | |
| 282 // in each heap region. | |
| 283 size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. | |
| 284 size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. | |
| 285 | |
| 6011 | 286 // The calculated GC efficiency of the region. |
| 342 | 287 double _gc_efficiency; |
| 288 | |
| 289 enum YoungType { | |
| 290 NotYoung, // a region is not young | |
| 291 Young, // a region is young | |
| 3766 | 292 Survivor // a region is young and it contains survivors |
| 342 | 293 }; |
| 294 | |
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295 volatile YoungType _young_type; |
| 342 | 296 int _young_index_in_cset; |
| 297 SurvRateGroup* _surv_rate_group; | |
| 298 int _age_index; | |
| 299 | |
| 300 // The start of the unmarked area. The unmarked area extends from this | |
| 301 // word until the top and/or end of the region, and is the part | |
| 302 // of the region for which no marking was done, i.e. objects may | |
| 303 // have been allocated in this part since the last mark phase. | |
| 304 // "prev" is the top at the start of the last completed marking. | |
| 305 // "next" is the top at the start of the in-progress marking (if any.) | |
| 306 HeapWord* _prev_top_at_mark_start; | |
| 307 HeapWord* _next_top_at_mark_start; | |
| 308 // If a collection pause is in progress, this is the top at the start | |
| 309 // of that pause. | |
| 310 | |
| 311 void init_top_at_mark_start() { | |
| 312 assert(_prev_marked_bytes == 0 && | |
| 313 _next_marked_bytes == 0, | |
| 314 "Must be called after zero_marked_bytes."); | |
| 315 HeapWord* bot = bottom(); | |
| 316 _prev_top_at_mark_start = bot; | |
| 317 _next_top_at_mark_start = bot; | |
| 318 } | |
| 319 | |
| 320 void set_young_type(YoungType new_type) { | |
| 321 //assert(_young_type != new_type, "setting the same type" ); | |
| 322 // TODO: add more assertions here | |
| 323 _young_type = new_type; | |
| 324 } | |
| 325 | |
|
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326 // Cached attributes used in the collection set policy information |
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327 |
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328 // The RSet length that was added to the total value |
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329 // for the collection set. |
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330 size_t _recorded_rs_length; |
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331 |
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332 // The predicted elapsed time that was added to total value |
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333 // for the collection set. |
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334 double _predicted_elapsed_time_ms; |
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335 |
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336 // The predicted number of bytes to copy that was added to |
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337 // the total value for the collection set. |
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338 size_t _predicted_bytes_to_copy; |
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339 |
| 342 | 340 public: |
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341 HeapRegion(uint hrs_index, |
| 3766 | 342 G1BlockOffsetSharedArray* sharedOffsetArray, |
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343 MemRegion mr); |
| 342 | 344 |
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345 static int LogOfHRGrainBytes; |
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346 static int LogOfHRGrainWords; |
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347 |
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348 static size_t GrainBytes; |
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349 static size_t GrainWords; |
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350 static size_t CardsPerRegion; |
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351 |
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352 static size_t align_up_to_region_byte_size(size_t sz) { |
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353 return (sz + (size_t) GrainBytes - 1) & |
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354 ~((1 << (size_t) LogOfHRGrainBytes) - 1); |
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355 } |
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356 |
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357 // It sets up the heap region size (GrainBytes / GrainWords), as |
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358 // well as other related fields that are based on the heap region |
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359 // size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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360 // CardsPerRegion). All those fields are considered constant |
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361 // throughout the JVM's execution, therefore they should only be set |
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362 // up once during initialization time. |
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363 static void setup_heap_region_size(uintx min_heap_size); |
| 342 | 364 |
| 355 | 365 enum ClaimValues { |
|
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366 InitialClaimValue = 0, |
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367 FinalCountClaimValue = 1, |
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368 NoteEndClaimValue = 2, |
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369 ScrubRemSetClaimValue = 3, |
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370 ParVerifyClaimValue = 4, |
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371 RebuildRSClaimValue = 5, |
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372 ParEvacFailureClaimValue = 6, |
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373 AggregateCountClaimValue = 7, |
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374 VerifyCountClaimValue = 8 |
| 355 | 375 }; |
| 376 | |
|
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377 inline HeapWord* par_allocate_no_bot_updates(size_t word_size) { |
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378 assert(is_young(), "we can only skip BOT updates on young regions"); |
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379 return ContiguousSpace::par_allocate(word_size); |
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380 } |
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381 inline HeapWord* 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::allocate(word_size); |
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384 } |
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385 |
| 342 | 386 // If this region is a member of a HeapRegionSeq, the index in that |
| 387 // sequence, otherwise -1. | |
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388 uint hrs_index() const { return _hrs_index; } |
| 342 | 389 |
| 390 // The number of bytes marked live in the region in the last marking phase. | |
| 391 size_t marked_bytes() { return _prev_marked_bytes; } | |
|
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392 size_t live_bytes() { |
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393 return (top() - prev_top_at_mark_start()) * HeapWordSize + marked_bytes(); |
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394 } |
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395 |
| 342 | 396 // The number of bytes counted in the next marking. |
| 397 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 398 // The number of bytes live wrt the next marking. | |
| 399 size_t next_live_bytes() { | |
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400 return |
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401 (top() - next_top_at_mark_start()) * HeapWordSize + next_marked_bytes(); |
| 342 | 402 } |
| 403 | |
| 404 // A lower bound on the amount of garbage bytes in the region. | |
| 405 size_t garbage_bytes() { | |
| 406 size_t used_at_mark_start_bytes = | |
| 407 (prev_top_at_mark_start() - bottom()) * HeapWordSize; | |
| 408 assert(used_at_mark_start_bytes >= marked_bytes(), | |
| 409 "Can't mark more than we have."); | |
| 410 return used_at_mark_start_bytes - marked_bytes(); | |
| 411 } | |
| 412 | |
|
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413 // Return the amount of bytes we'll reclaim if we collect this |
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414 // region. This includes not only the known garbage bytes in the |
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415 // region but also any unallocated space in it, i.e., [top, end), |
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416 // since it will also be reclaimed if we collect the region. |
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417 size_t reclaimable_bytes() { |
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418 size_t known_live_bytes = live_bytes(); |
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419 assert(known_live_bytes <= capacity(), "sanity"); |
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420 return capacity() - known_live_bytes; |
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421 } |
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422 |
| 342 | 423 // An upper bound on the number of live bytes in the region. |
| 424 size_t max_live_bytes() { return used() - garbage_bytes(); } | |
| 425 | |
| 426 void add_to_marked_bytes(size_t incr_bytes) { | |
| 427 _next_marked_bytes = _next_marked_bytes + incr_bytes; | |
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428 assert(_next_marked_bytes <= used(), "invariant" ); |
| 342 | 429 } |
| 430 | |
| 431 void zero_marked_bytes() { | |
| 432 _prev_marked_bytes = _next_marked_bytes = 0; | |
| 433 } | |
| 434 | |
| 355 | 435 bool isHumongous() const { return _humongous_type != NotHumongous; } |
| 436 bool startsHumongous() const { return _humongous_type == StartsHumongous; } | |
| 437 bool continuesHumongous() const { return _humongous_type == ContinuesHumongous; } | |
| 342 | 438 // For a humongous region, region in which it starts. |
| 439 HeapRegion* humongous_start_region() const { | |
| 440 return _humongous_start_region; | |
| 441 } | |
| 442 | |
|
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443 // Return the number of distinct regions that are covered by this region: |
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444 // 1 if the region is not humongous, >= 1 if the region is humongous. |
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445 uint region_num() const { |
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446 if (!isHumongous()) { |
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447 return 1U; |
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448 } else { |
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449 assert(startsHumongous(), "doesn't make sense on HC regions"); |
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450 assert(capacity() % HeapRegion::GrainBytes == 0, "sanity"); |
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451 return (uint) (capacity() >> HeapRegion::LogOfHRGrainBytes); |
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452 } |
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453 } |
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454 |
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455 // Return the index + 1 of the last HC regions that's associated |
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456 // with this HS region. |
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457 uint last_hc_index() const { |
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458 assert(startsHumongous(), "don't call this otherwise"); |
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459 return hrs_index() + region_num(); |
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460 } |
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461 |
|
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462 // Same as Space::is_in_reserved, but will use the original size of the region. |
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463 // The original size is different only for start humongous regions. They get |
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464 // their _end set up to be the end of the last continues region of the |
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465 // corresponding humongous object. |
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466 bool is_in_reserved_raw(const void* p) const { |
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467 return _bottom <= p && p < _orig_end; |
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468 } |
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469 |
|
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470 // Makes the current region be a "starts humongous" region, i.e., |
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471 // the first region in a series of one or more contiguous regions |
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472 // that will contain a single "humongous" object. The two parameters |
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473 // are as follows: |
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474 // |
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475 // new_top : The new value of the top field of this region which |
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476 // points to the end of the humongous object that's being |
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477 // allocated. If there is more than one region in the series, top |
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478 // will lie beyond this region's original end field and on the last |
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479 // region in the series. |
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480 // |
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481 // new_end : The new value of the end field of this region which |
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482 // points to the end of the last region in the series. If there is |
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483 // one region in the series (namely: this one) end will be the same |
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484 // as the original end of this region. |
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485 // |
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486 // Updating top and end as described above makes this region look as |
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487 // if it spans the entire space taken up by all the regions in the |
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488 // series and an single allocation moved its top to new_top. This |
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489 // ensures that the space (capacity / allocated) taken up by all |
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490 // humongous regions can be calculated by just looking at the |
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491 // "starts humongous" regions and by ignoring the "continues |
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492 // humongous" regions. |
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493 void set_startsHumongous(HeapWord* new_top, HeapWord* new_end); |
| 342 | 494 |
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495 // Makes the current region be a "continues humongous' |
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496 // region. first_hr is the "start humongous" region of the series |
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497 // which this region will be part of. |
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498 void set_continuesHumongous(HeapRegion* first_hr); |
| 342 | 499 |
| 2152 | 500 // Unsets the humongous-related fields on the region. |
| 501 void set_notHumongous(); | |
| 502 | |
| 342 | 503 // If the region has a remembered set, return a pointer to it. |
| 504 HeapRegionRemSet* rem_set() const { | |
| 505 return _rem_set; | |
| 506 } | |
| 507 | |
| 508 // True iff the region is in current collection_set. | |
| 509 bool in_collection_set() const { | |
| 510 return _in_collection_set; | |
| 511 } | |
| 512 void set_in_collection_set(bool b) { | |
| 513 _in_collection_set = b; | |
| 514 } | |
| 515 HeapRegion* next_in_collection_set() { | |
| 516 assert(in_collection_set(), "should only invoke on member of CS."); | |
| 517 assert(_next_in_special_set == NULL || | |
| 518 _next_in_special_set->in_collection_set(), | |
| 519 "Malformed CS."); | |
| 520 return _next_in_special_set; | |
| 521 } | |
| 522 void set_next_in_collection_set(HeapRegion* r) { | |
| 523 assert(in_collection_set(), "should only invoke on member of CS."); | |
| 524 assert(r == NULL || r->in_collection_set(), "Malformed CS."); | |
| 525 _next_in_special_set = r; | |
| 526 } | |
| 527 | |
| 2152 | 528 // Methods used by the HeapRegionSetBase class and subclasses. |
| 342 | 529 |
| 2152 | 530 // Getter and setter for the next field used to link regions into |
| 531 // linked lists. | |
| 532 HeapRegion* next() { return _next; } | |
| 533 | |
| 534 void set_next(HeapRegion* next) { _next = next; } | |
| 342 | 535 |
| 2152 | 536 // Every region added to a set is tagged with a reference to that |
| 537 // set. This is used for doing consistency checking to make sure that | |
| 538 // the contents of a set are as they should be and it's only | |
| 539 // available in non-product builds. | |
| 540 #ifdef ASSERT | |
| 541 void set_containing_set(HeapRegionSetBase* containing_set) { | |
| 542 assert((containing_set == NULL && _containing_set != NULL) || | |
| 543 (containing_set != NULL && _containing_set == NULL), | |
| 544 err_msg("containing_set: "PTR_FORMAT" " | |
| 545 "_containing_set: "PTR_FORMAT, | |
| 546 containing_set, _containing_set)); | |
| 547 | |
| 548 _containing_set = containing_set; | |
| 2361 | 549 } |
| 342 | 550 |
| 2152 | 551 HeapRegionSetBase* containing_set() { return _containing_set; } |
| 552 #else // ASSERT | |
| 553 void set_containing_set(HeapRegionSetBase* containing_set) { } | |
| 342 | 554 |
| 2361 | 555 // containing_set() is only used in asserts so there's no reason |
| 2152 | 556 // to provide a dummy version of it. |
| 557 #endif // ASSERT | |
| 342 | 558 |
| 2152 | 559 // If we want to remove regions from a list in bulk we can simply tag |
| 560 // them with the pending_removal tag and call the | |
| 561 // remove_all_pending() method on the list. | |
| 342 | 562 |
| 2152 | 563 bool pending_removal() { return _pending_removal; } |
| 564 | |
| 565 void set_pending_removal(bool pending_removal) { | |
| 2361 | 566 if (pending_removal) { |
| 567 assert(!_pending_removal && containing_set() != NULL, | |
| 568 "can only set pending removal to true if it's false and " | |
| 569 "the region belongs to a region set"); | |
| 570 } else { | |
| 571 assert( _pending_removal && containing_set() == NULL, | |
| 572 "can only set pending removal to false if it's true and " | |
| 573 "the region does not belong to a region set"); | |
| 574 } | |
| 2152 | 575 |
| 576 _pending_removal = pending_removal; | |
| 342 | 577 } |
| 578 | |
| 579 HeapRegion* get_next_young_region() { return _next_young_region; } | |
| 580 void set_next_young_region(HeapRegion* hr) { | |
| 581 _next_young_region = hr; | |
| 582 } | |
| 583 | |
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584 HeapRegion* get_next_dirty_cards_region() const { return _next_dirty_cards_region; } |
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585 HeapRegion** next_dirty_cards_region_addr() { return &_next_dirty_cards_region; } |
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586 void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; } |
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587 bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; } |
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588 |
| 3766 | 589 HeapWord* orig_end() { return _orig_end; } |
| 590 | |
| 342 | 591 // Allows logical separation between objects allocated before and after. |
| 592 void save_marks(); | |
| 593 | |
| 594 // Reset HR stuff to default values. | |
| 595 void hr_clear(bool par, bool clear_space); | |
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596 void par_clear(); |
| 342 | 597 |
| 598 // Get the start of the unmarked area in this region. | |
| 599 HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } | |
| 600 HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } | |
| 601 | |
| 602 // Apply "cl->do_oop" to (the addresses of) all reference fields in objects | |
| 603 // allocated in the current region before the last call to "save_mark". | |
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604 void oop_before_save_marks_iterate(ExtendedOopClosure* cl); |
| 342 | 605 |
| 606 // Note the start or end of marking. This tells the heap region | |
| 607 // that the collector is about to start or has finished (concurrently) | |
| 608 // marking the heap. | |
| 609 | |
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610 // Notify the region that concurrent marking is starting. Initialize |
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611 // all fields related to the next marking info. |
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612 inline void note_start_of_marking(); |
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613 |
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614 // Notify the region that concurrent marking has finished. Copy the |
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615 // (now finalized) next marking info fields into the prev marking |
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616 // info fields. |
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617 inline void note_end_of_marking(); |
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618 |
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619 // Notify the region that it will be used as to-space during a GC |
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620 // and we are about to start copying objects into it. |
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621 inline void note_start_of_copying(bool during_initial_mark); |
| 342 | 622 |
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623 // Notify the region that it ceases being to-space during a GC and |
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624 // we will not copy objects into it any more. |
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625 inline void note_end_of_copying(bool during_initial_mark); |
| 342 | 626 |
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627 // Notify the region that we are about to start processing |
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628 // self-forwarded objects during evac failure handling. |
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629 void note_self_forwarding_removal_start(bool during_initial_mark, |
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630 bool during_conc_mark); |
| 342 | 631 |
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632 // Notify the region that we have finished processing self-forwarded |
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633 // objects during evac failure handling. |
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634 void note_self_forwarding_removal_end(bool during_initial_mark, |
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635 bool during_conc_mark, |
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636 size_t marked_bytes); |
| 342 | 637 |
| 638 // Returns "false" iff no object in the region was allocated when the | |
| 639 // last mark phase ended. | |
| 640 bool is_marked() { return _prev_top_at_mark_start != bottom(); } | |
| 641 | |
| 642 void reset_during_compaction() { | |
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643 assert(isHumongous() && startsHumongous(), |
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644 "should only be called for starts humongous regions"); |
| 342 | 645 |
| 646 zero_marked_bytes(); | |
| 647 init_top_at_mark_start(); | |
| 648 } | |
| 649 | |
| 650 void calc_gc_efficiency(void); | |
| 651 double gc_efficiency() { return _gc_efficiency;} | |
| 652 | |
| 653 bool is_young() const { return _young_type != NotYoung; } | |
| 654 bool is_survivor() const { return _young_type == Survivor; } | |
| 655 | |
| 656 int young_index_in_cset() const { return _young_index_in_cset; } | |
| 657 void set_young_index_in_cset(int index) { | |
| 658 assert( (index == -1) || is_young(), "pre-condition" ); | |
| 659 _young_index_in_cset = index; | |
| 660 } | |
| 661 | |
| 662 int age_in_surv_rate_group() { | |
| 663 assert( _surv_rate_group != NULL, "pre-condition" ); | |
| 664 assert( _age_index > -1, "pre-condition" ); | |
| 665 return _surv_rate_group->age_in_group(_age_index); | |
| 666 } | |
| 667 | |
| 668 void record_surv_words_in_group(size_t words_survived) { | |
| 669 assert( _surv_rate_group != NULL, "pre-condition" ); | |
| 670 assert( _age_index > -1, "pre-condition" ); | |
| 671 int age_in_group = age_in_surv_rate_group(); | |
| 672 _surv_rate_group->record_surviving_words(age_in_group, words_survived); | |
| 673 } | |
| 674 | |
| 675 int age_in_surv_rate_group_cond() { | |
| 676 if (_surv_rate_group != NULL) | |
| 677 return age_in_surv_rate_group(); | |
| 678 else | |
| 679 return -1; | |
| 680 } | |
| 681 | |
| 682 SurvRateGroup* surv_rate_group() { | |
| 683 return _surv_rate_group; | |
| 684 } | |
| 685 | |
| 686 void install_surv_rate_group(SurvRateGroup* surv_rate_group) { | |
| 687 assert( surv_rate_group != NULL, "pre-condition" ); | |
| 688 assert( _surv_rate_group == NULL, "pre-condition" ); | |
| 689 assert( is_young(), "pre-condition" ); | |
| 690 | |
| 691 _surv_rate_group = surv_rate_group; | |
| 692 _age_index = surv_rate_group->next_age_index(); | |
| 693 } | |
| 694 | |
| 695 void uninstall_surv_rate_group() { | |
| 696 if (_surv_rate_group != NULL) { | |
| 697 assert( _age_index > -1, "pre-condition" ); | |
| 698 assert( is_young(), "pre-condition" ); | |
| 699 | |
| 700 _surv_rate_group = NULL; | |
| 701 _age_index = -1; | |
| 702 } else { | |
| 703 assert( _age_index == -1, "pre-condition" ); | |
| 704 } | |
| 705 } | |
| 706 | |
| 707 void set_young() { set_young_type(Young); } | |
| 708 | |
| 709 void set_survivor() { set_young_type(Survivor); } | |
| 710 | |
| 711 void set_not_young() { set_young_type(NotYoung); } | |
| 712 | |
| 713 // Determine if an object has been allocated since the last | |
| 714 // mark performed by the collector. This returns true iff the object | |
| 715 // is within the unmarked area of the region. | |
| 716 bool obj_allocated_since_prev_marking(oop obj) const { | |
| 717 return (HeapWord *) obj >= prev_top_at_mark_start(); | |
| 718 } | |
| 719 bool obj_allocated_since_next_marking(oop obj) const { | |
| 720 return (HeapWord *) obj >= next_top_at_mark_start(); | |
| 721 } | |
| 722 | |
| 723 // For parallel heapRegion traversal. | |
| 724 bool claimHeapRegion(int claimValue); | |
| 725 jint claim_value() { return _claimed; } | |
| 726 // Use this carefully: only when you're sure no one is claiming... | |
| 727 void set_claim_value(int claimValue) { _claimed = claimValue; } | |
| 728 | |
| 729 // Returns the "evacuation_failed" property of the region. | |
| 730 bool evacuation_failed() { return _evacuation_failed; } | |
| 731 | |
| 732 // Sets the "evacuation_failed" property of the region. | |
| 733 void set_evacuation_failed(bool b) { | |
| 734 _evacuation_failed = b; | |
| 735 | |
| 736 if (b) { | |
| 737 _next_marked_bytes = 0; | |
| 738 } | |
| 739 } | |
| 740 | |
| 741 // Requires that "mr" be entirely within the region. | |
| 742 // Apply "cl->do_object" to all objects that intersect with "mr". | |
| 743 // If the iteration encounters an unparseable portion of the region, | |
| 744 // or if "cl->abort()" is true after a closure application, | |
| 745 // terminate the iteration and return the address of the start of the | |
| 746 // subregion that isn't done. (The two can be distinguished by querying | |
| 747 // "cl->abort()".) Return of "NULL" indicates that the iteration | |
| 748 // completed. | |
| 749 HeapWord* | |
| 750 object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); | |
| 751 | |
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752 // filter_young: if true and the region is a young region then we |
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753 // skip the iteration. |
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754 // card_ptr: if not NULL, and we decide that the card is not young |
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755 // and we iterate over it, we'll clean the card before we start the |
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756 // iteration. |
| 342 | 757 HeapWord* |
| 758 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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759 FilterOutOfRegionClosure* cl, |
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760 bool filter_young, |
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761 jbyte* card_ptr); |
| 342 | 762 |
| 763 // A version of block start that is guaranteed to find *some* block | |
| 764 // boundary at or before "p", but does not object iteration, and may | |
| 765 // therefore be used safely when the heap is unparseable. | |
| 766 HeapWord* block_start_careful(const void* p) const { | |
| 767 return _offsets.block_start_careful(p); | |
| 768 } | |
| 769 | |
| 770 // Requires that "addr" is within the region. Returns the start of the | |
| 771 // first ("careful") block that starts at or after "addr", or else the | |
| 772 // "end" of the region if there is no such block. | |
| 773 HeapWord* next_block_start_careful(HeapWord* addr); | |
| 774 | |
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775 size_t recorded_rs_length() const { return _recorded_rs_length; } |
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776 double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; } |
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777 size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; } |
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778 |
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779 void set_recorded_rs_length(size_t rs_length) { |
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780 _recorded_rs_length = rs_length; |
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781 } |
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782 |
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783 void set_predicted_elapsed_time_ms(double ms) { |
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784 _predicted_elapsed_time_ms = ms; |
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785 } |
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786 |
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787 void set_predicted_bytes_to_copy(size_t bytes) { |
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788 _predicted_bytes_to_copy = bytes; |
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789 } |
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790 |
| 342 | 791 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ |
| 792 virtual void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
| 793 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DECL) | |
| 794 | |
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795 virtual CompactibleSpace* next_compaction_space() const; |
| 342 | 796 |
| 797 virtual void reset_after_compaction(); | |
| 798 | |
| 799 void print() const; | |
| 800 void print_on(outputStream* st) const; | |
| 801 | |
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802 // vo == UsePrevMarking -> use "prev" marking information, |
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803 // vo == UseNextMarking -> use "next" marking information |
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804 // vo == UseMarkWord -> use the mark word in the object header |
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805 // |
| 811 | 806 // NOTE: Only the "prev" marking information is guaranteed to be |
| 807 // consistent most of the time, so most calls to this should use | |
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808 // vo == UsePrevMarking. |
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809 // Currently, there is only one case where this is called with |
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810 // vo == UseNextMarking, which is to verify the "next" marking |
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811 // information at the end of remark. |
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812 // Currently there is only one place where this is called with |
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813 // vo == UseMarkWord, which is to verify the marking during a |
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814 // full GC. |
| 6008 | 815 void verify(VerifyOption vo, bool *failures) const; |
| 811 | 816 |
| 817 // Override; it uses the "prev" marking information | |
| 6008 | 818 virtual void verify() const; |
| 342 | 819 }; |
| 820 | |
| 821 // HeapRegionClosure is used for iterating over regions. | |
| 822 // Terminates the iteration when the "doHeapRegion" method returns "true". | |
| 823 class HeapRegionClosure : public StackObj { | |
| 824 friend class HeapRegionSeq; | |
| 825 friend class G1CollectedHeap; | |
| 826 | |
| 827 bool _complete; | |
| 828 void incomplete() { _complete = false; } | |
| 829 | |
| 830 public: | |
| 831 HeapRegionClosure(): _complete(true) {} | |
| 832 | |
| 833 // Typically called on each region until it returns true. | |
| 834 virtual bool doHeapRegion(HeapRegion* r) = 0; | |
| 835 | |
| 836 // True after iteration if the closure was applied to all heap regions | |
| 837 // and returned "false" in all cases. | |
| 838 bool complete() { return _complete; } | |
| 839 }; | |
| 840 | |
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841 #endif // INCLUDE_ALL_GCS |
| 1972 | 842 |
| 843 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |