Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegion.hpp @ 6007:5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
Summary: Added log levels "fine", "finer" and "finest". Let PrintGC map to "fine" and PrintGCDetails map to "finer". Separated out the per worker information in the G1 logging to the "finest" level.
Reviewed-by: stefank, jwilhelm, tonyp, johnc
| author | brutisso |
|---|---|
| date | Fri, 13 Apr 2012 01:59:38 +0200 |
| parents | 2a0172480595 |
| children | b632e80fc9dc |
| 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" | |
| 35 | |
| 342 | 36 #ifndef SERIALGC |
| 37 | |
| 38 // A HeapRegion is the smallest piece of a G1CollectedHeap that | |
| 39 // can be collected independently. | |
| 40 | |
| 41 // NOTE: Although a HeapRegion is a Space, its | |
| 42 // Space::initDirtyCardClosure method must not be called. | |
| 43 // The problem is that the existence of this method breaks | |
| 44 // the independence of barrier sets from remembered sets. | |
| 45 // The solution is to remove this method from the definition | |
| 46 // of a Space. | |
| 47 | |
| 48 class CompactibleSpace; | |
| 49 class ContiguousSpace; | |
| 50 class HeapRegionRemSet; | |
| 51 class HeapRegionRemSetIterator; | |
| 52 class HeapRegion; | |
| 2152 | 53 class HeapRegionSetBase; |
| 54 | |
| 3766 | 55 #define HR_FORMAT SIZE_FORMAT":(%s)["PTR_FORMAT","PTR_FORMAT","PTR_FORMAT"]" |
| 56 #define HR_FORMAT_PARAMS(_hr_) \ | |
| 57 (_hr_)->hrs_index(), \ | |
| 58 (_hr_)->is_survivor() ? "S" : (_hr_)->is_young() ? "E" : "-", \ | |
| 59 (_hr_)->bottom(), (_hr_)->top(), (_hr_)->end() | |
| 342 | 60 |
| 61 // A dirty card to oop closure for heap regions. It | |
| 62 // knows how to get the G1 heap and how to use the bitmap | |
| 63 // in the concurrent marker used by G1 to filter remembered | |
| 64 // sets. | |
| 65 | |
| 66 class HeapRegionDCTOC : public ContiguousSpaceDCTOC { | |
| 67 public: | |
| 68 // Specification of possible DirtyCardToOopClosure filtering. | |
| 69 enum FilterKind { | |
| 70 NoFilterKind, | |
| 71 IntoCSFilterKind, | |
| 72 OutOfRegionFilterKind | |
| 73 }; | |
| 74 | |
| 75 protected: | |
| 76 HeapRegion* _hr; | |
| 77 FilterKind _fk; | |
| 78 G1CollectedHeap* _g1; | |
| 79 | |
| 80 void walk_mem_region_with_cl(MemRegion mr, | |
| 81 HeapWord* bottom, HeapWord* top, | |
| 82 OopClosure* cl); | |
| 83 | |
| 84 // We don't specialize this for FilteringClosure; filtering is handled by | |
| 85 // the "FilterKind" mechanism. But we provide this to avoid a compiler | |
| 86 // warning. | |
| 87 void walk_mem_region_with_cl(MemRegion mr, | |
| 88 HeapWord* bottom, HeapWord* top, | |
| 89 FilteringClosure* cl) { | |
| 90 HeapRegionDCTOC::walk_mem_region_with_cl(mr, bottom, top, | |
| 91 (OopClosure*)cl); | |
| 92 } | |
| 93 | |
| 94 // Get the actual top of the area on which the closure will | |
| 95 // operate, given where the top is assumed to be (the end of the | |
| 96 // memory region passed to do_MemRegion) and where the object | |
| 97 // at the top is assumed to start. For example, an object may | |
| 98 // start at the top but actually extend past the assumed top, | |
| 99 // in which case the top becomes the end of the object. | |
| 100 HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj) { | |
| 101 return ContiguousSpaceDCTOC::get_actual_top(top, top_obj); | |
| 102 } | |
| 103 | |
| 104 // Walk the given memory region from bottom to (actual) top | |
| 105 // looking for objects and applying the oop closure (_cl) to | |
| 106 // them. The base implementation of this treats the area as | |
| 107 // blocks, where a block may or may not be an object. Sub- | |
| 108 // classes should override this to provide more accurate | |
| 109 // or possibly more efficient walking. | |
| 110 void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top) { | |
| 111 Filtering_DCTOC::walk_mem_region(mr, bottom, top); | |
| 112 } | |
| 113 | |
| 114 public: | |
| 115 HeapRegionDCTOC(G1CollectedHeap* g1, | |
| 116 HeapRegion* hr, OopClosure* cl, | |
| 117 CardTableModRefBS::PrecisionStyle precision, | |
| 118 FilterKind fk); | |
| 119 }; | |
| 120 | |
| 121 // The complicating factor is that BlockOffsetTable diverged | |
| 122 // significantly, and we need functionality that is only in the G1 version. | |
| 123 // So I copied that code, which led to an alternate G1 version of | |
| 124 // OffsetTableContigSpace. If the two versions of BlockOffsetTable could | |
| 125 // be reconciled, then G1OffsetTableContigSpace could go away. | |
| 126 | |
| 127 // The idea behind time stamps is the following. Doing a save_marks on | |
| 128 // all regions at every GC pause is time consuming (if I remember | |
| 129 // well, 10ms or so). So, we would like to do that only for regions | |
| 130 // that are GC alloc regions. To achieve this, we use time | |
| 131 // stamps. For every evacuation pause, G1CollectedHeap generates a | |
| 132 // unique time stamp (essentially a counter that gets | |
| 133 // incremented). Every time we want to call save_marks on a region, | |
| 134 // we set the saved_mark_word to top and also copy the current GC | |
| 135 // time stamp to the time stamp field of the space. Reading the | |
| 136 // saved_mark_word involves checking the time stamp of the | |
| 137 // region. If it is the same as the current GC time stamp, then we | |
| 138 // can safely read the saved_mark_word field, as it is valid. If the | |
| 139 // time stamp of the region is not the same as the current GC time | |
| 140 // stamp, then we instead read top, as the saved_mark_word field is | |
| 141 // invalid. Time stamps (on the regions and also on the | |
| 142 // G1CollectedHeap) are reset at every cleanup (we iterate over | |
| 143 // the regions anyway) and at the end of a Full GC. The current scheme | |
| 144 // that uses sequential unsigned ints will fail only if we have 4b | |
| 145 // evacuation pauses between two cleanups, which is _highly_ unlikely. | |
| 146 | |
| 147 class G1OffsetTableContigSpace: public ContiguousSpace { | |
| 148 friend class VMStructs; | |
| 149 protected: | |
| 150 G1BlockOffsetArrayContigSpace _offsets; | |
| 151 Mutex _par_alloc_lock; | |
| 152 volatile unsigned _gc_time_stamp; | |
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153 // When we need to retire an allocation region, while other threads |
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154 // are also concurrently trying to allocate into it, we typically |
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155 // allocate a dummy object at the end of the region to ensure that |
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156 // no more allocations can take place in it. However, sometimes we |
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157 // want to know where the end of the last "real" object we allocated |
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158 // into the region was and this is what this keeps track. |
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159 HeapWord* _pre_dummy_top; |
| 342 | 160 |
| 161 public: | |
| 162 // Constructor. If "is_zeroed" is true, the MemRegion "mr" may be | |
| 163 // assumed to contain zeros. | |
| 164 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
| 165 MemRegion mr, bool is_zeroed = false); | |
| 166 | |
| 167 void set_bottom(HeapWord* value); | |
| 168 void set_end(HeapWord* value); | |
| 169 | |
| 170 virtual HeapWord* saved_mark_word() const; | |
| 171 virtual void set_saved_mark(); | |
| 172 void reset_gc_time_stamp() { _gc_time_stamp = 0; } | |
| 173 | |
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174 // See the comment above in the declaration of _pre_dummy_top for an |
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175 // explanation of what it is. |
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176 void set_pre_dummy_top(HeapWord* pre_dummy_top) { |
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177 assert(is_in(pre_dummy_top) && pre_dummy_top <= top(), "pre-condition"); |
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178 _pre_dummy_top = pre_dummy_top; |
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179 } |
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180 HeapWord* pre_dummy_top() { |
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181 return (_pre_dummy_top == NULL) ? top() : _pre_dummy_top; |
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182 } |
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183 void reset_pre_dummy_top() { _pre_dummy_top = NULL; } |
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184 |
| 356 | 185 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
| 186 virtual void clear(bool mangle_space); | |
| 342 | 187 |
| 188 HeapWord* block_start(const void* p); | |
| 189 HeapWord* block_start_const(const void* p) const; | |
| 190 | |
| 191 // Add offset table update. | |
| 192 virtual HeapWord* allocate(size_t word_size); | |
| 193 HeapWord* par_allocate(size_t word_size); | |
| 194 | |
| 195 // MarkSweep support phase3 | |
| 196 virtual HeapWord* initialize_threshold(); | |
| 197 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
| 198 | |
| 199 virtual void print() const; | |
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200 |
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201 void reset_bot() { |
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202 _offsets.zero_bottom_entry(); |
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203 _offsets.initialize_threshold(); |
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204 } |
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205 |
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206 void update_bot_for_object(HeapWord* start, size_t word_size) { |
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207 _offsets.alloc_block(start, word_size); |
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208 } |
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209 |
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210 void print_bot_on(outputStream* out) { |
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211 _offsets.print_on(out); |
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212 } |
| 342 | 213 }; |
| 214 | |
| 215 class HeapRegion: public G1OffsetTableContigSpace { | |
| 216 friend class VMStructs; | |
| 217 private: | |
| 218 | |
| 355 | 219 enum HumongousType { |
| 220 NotHumongous = 0, | |
| 221 StartsHumongous, | |
| 222 ContinuesHumongous | |
| 223 }; | |
| 224 | |
| 342 | 225 // Requires that the region "mr" be dense with objects, and begin and end |
| 226 // with an object. | |
| 227 void oops_in_mr_iterate(MemRegion mr, OopClosure* cl); | |
| 228 | |
| 229 // The remembered set for this region. | |
| 230 // (Might want to make this "inline" later, to avoid some alloc failure | |
| 231 // issues.) | |
| 232 HeapRegionRemSet* _rem_set; | |
| 233 | |
| 234 G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } | |
| 235 | |
| 236 protected: | |
| 3766 | 237 // The index of this region in the heap region sequence. |
| 238 size_t _hrs_index; | |
| 342 | 239 |
| 355 | 240 HumongousType _humongous_type; |
| 342 | 241 // For a humongous region, region in which it starts. |
| 242 HeapRegion* _humongous_start_region; | |
| 243 // For the start region of a humongous sequence, it's original end(). | |
| 244 HeapWord* _orig_end; | |
| 245 | |
| 246 // True iff the region is in current collection_set. | |
| 247 bool _in_collection_set; | |
| 248 | |
| 249 // True iff an attempt to evacuate an object in the region failed. | |
| 250 bool _evacuation_failed; | |
| 251 | |
| 252 // A heap region may be a member one of a number of special subsets, each | |
| 253 // represented as linked lists through the field below. Currently, these | |
| 254 // sets include: | |
| 255 // The collection set. | |
| 256 // The set of allocation regions used in a collection pause. | |
| 257 // Spaces that may contain gray objects. | |
| 258 HeapRegion* _next_in_special_set; | |
| 259 | |
| 260 // next region in the young "generation" region set | |
| 261 HeapRegion* _next_young_region; | |
| 262 | |
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263 // Next region whose cards need cleaning |
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264 HeapRegion* _next_dirty_cards_region; |
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265 |
| 2152 | 266 // Fields used by the HeapRegionSetBase class and subclasses. |
| 267 HeapRegion* _next; | |
| 268 #ifdef ASSERT | |
| 269 HeapRegionSetBase* _containing_set; | |
| 270 #endif // ASSERT | |
| 271 bool _pending_removal; | |
| 272 | |
| 342 | 273 // For parallel heapRegion traversal. |
| 274 jint _claimed; | |
| 275 | |
| 276 // We use concurrent marking to determine the amount of live data | |
| 277 // in each heap region. | |
| 278 size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. | |
| 279 size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. | |
| 280 | |
| 281 // See "sort_index" method. -1 means is not in the array. | |
| 282 int _sort_index; | |
| 283 | |
| 284 // <PREDICTION> | |
| 285 double _gc_efficiency; | |
| 286 // </PREDICTION> | |
| 287 | |
| 288 enum YoungType { | |
| 289 NotYoung, // a region is not young | |
| 290 Young, // a region is young | |
| 3766 | 291 Survivor // a region is young and it contains survivors |
| 342 | 292 }; |
| 293 | |
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294 volatile YoungType _young_type; |
| 342 | 295 int _young_index_in_cset; |
| 296 SurvRateGroup* _surv_rate_group; | |
| 297 int _age_index; | |
| 298 | |
| 299 // The start of the unmarked area. The unmarked area extends from this | |
| 300 // word until the top and/or end of the region, and is the part | |
| 301 // of the region for which no marking was done, i.e. objects may | |
| 302 // have been allocated in this part since the last mark phase. | |
| 303 // "prev" is the top at the start of the last completed marking. | |
| 304 // "next" is the top at the start of the in-progress marking (if any.) | |
| 305 HeapWord* _prev_top_at_mark_start; | |
| 306 HeapWord* _next_top_at_mark_start; | |
| 307 // If a collection pause is in progress, this is the top at the start | |
| 308 // of that pause. | |
| 309 | |
| 310 // We've counted the marked bytes of objects below here. | |
| 311 HeapWord* _top_at_conc_mark_count; | |
| 312 | |
| 313 void init_top_at_mark_start() { | |
| 314 assert(_prev_marked_bytes == 0 && | |
| 315 _next_marked_bytes == 0, | |
| 316 "Must be called after zero_marked_bytes."); | |
| 317 HeapWord* bot = bottom(); | |
| 318 _prev_top_at_mark_start = bot; | |
| 319 _next_top_at_mark_start = bot; | |
| 320 _top_at_conc_mark_count = bot; | |
| 321 } | |
| 322 | |
| 323 void set_young_type(YoungType new_type) { | |
| 324 //assert(_young_type != new_type, "setting the same type" ); | |
| 325 // TODO: add more assertions here | |
| 326 _young_type = new_type; | |
| 327 } | |
| 328 | |
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329 // Cached attributes used in the collection set policy information |
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330 |
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331 // The RSet length that was added to the total value |
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332 // for the collection set. |
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333 size_t _recorded_rs_length; |
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334 |
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335 // The predicted elapsed time that was added to total value |
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336 // for the collection set. |
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337 double _predicted_elapsed_time_ms; |
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338 |
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339 // The predicted number of bytes to copy that was added to |
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340 // the total value for the collection set. |
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341 size_t _predicted_bytes_to_copy; |
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342 |
| 342 | 343 public: |
| 344 // If "is_zeroed" is "true", the region "mr" can be assumed to contain zeros. | |
| 3766 | 345 HeapRegion(size_t hrs_index, |
| 346 G1BlockOffsetSharedArray* sharedOffsetArray, | |
| 342 | 347 MemRegion mr, bool is_zeroed); |
| 348 | |
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349 static int LogOfHRGrainBytes; |
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350 static int LogOfHRGrainWords; |
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351 |
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352 static size_t GrainBytes; |
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353 static size_t GrainWords; |
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354 static size_t CardsPerRegion; |
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355 |
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356 static size_t align_up_to_region_byte_size(size_t sz) { |
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357 return (sz + (size_t) GrainBytes - 1) & |
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358 ~((1 << (size_t) LogOfHRGrainBytes) - 1); |
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359 } |
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360 |
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361 // It sets up the heap region size (GrainBytes / GrainWords), as |
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362 // well as other related fields that are based on the heap region |
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363 // size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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364 // CardsPerRegion). All those fields are considered constant |
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365 // throughout the JVM's execution, therefore they should only be set |
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366 // up once during initialization time. |
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367 static void setup_heap_region_size(uintx min_heap_size); |
| 342 | 368 |
| 355 | 369 enum ClaimValues { |
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370 InitialClaimValue = 0, |
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371 FinalCountClaimValue = 1, |
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372 NoteEndClaimValue = 2, |
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373 ScrubRemSetClaimValue = 3, |
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374 ParVerifyClaimValue = 4, |
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375 RebuildRSClaimValue = 5, |
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376 ParEvacFailureClaimValue = 6, |
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377 AggregateCountClaimValue = 7, |
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378 VerifyCountClaimValue = 8 |
| 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. | |
| 3766 | 392 size_t 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 // Same as Space::is_in_reserved, but will use the original size of the region. |
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448 // The original size is different only for start humongous regions. They get |
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449 // their _end set up to be the end of the last continues region of the |
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450 // corresponding humongous object. |
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451 bool is_in_reserved_raw(const void* p) const { |
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452 return _bottom <= p && p < _orig_end; |
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453 } |
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454 |
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455 // Makes the current region be a "starts humongous" region, i.e., |
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456 // the first region in a series of one or more contiguous regions |
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457 // that will contain a single "humongous" object. The two parameters |
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458 // are as follows: |
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459 // |
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460 // new_top : The new value of the top field of this region which |
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461 // points to the end of the humongous object that's being |
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462 // allocated. If there is more than one region in the series, top |
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463 // will lie beyond this region's original end field and on the last |
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464 // region in the series. |
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465 // |
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466 // new_end : The new value of the end field of this region which |
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467 // points to the end of the last region in the series. If there is |
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468 // one region in the series (namely: this one) end will be the same |
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469 // as the original end of this region. |
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470 // |
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471 // Updating top and end as described above makes this region look as |
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472 // if it spans the entire space taken up by all the regions in the |
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473 // series and an single allocation moved its top to new_top. This |
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474 // ensures that the space (capacity / allocated) taken up by all |
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475 // humongous regions can be calculated by just looking at the |
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476 // "starts humongous" regions and by ignoring the "continues |
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477 // humongous" regions. |
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478 void set_startsHumongous(HeapWord* new_top, HeapWord* new_end); |
| 342 | 479 |
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480 // Makes the current region be a "continues humongous' |
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481 // region. first_hr is the "start humongous" region of the series |
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482 // which this region will be part of. |
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483 void set_continuesHumongous(HeapRegion* first_hr); |
| 342 | 484 |
| 2152 | 485 // Unsets the humongous-related fields on the region. |
| 486 void set_notHumongous(); | |
| 487 | |
| 342 | 488 // If the region has a remembered set, return a pointer to it. |
| 489 HeapRegionRemSet* rem_set() const { | |
| 490 return _rem_set; | |
| 491 } | |
| 492 | |
| 493 // True iff the region is in current collection_set. | |
| 494 bool in_collection_set() const { | |
| 495 return _in_collection_set; | |
| 496 } | |
| 497 void set_in_collection_set(bool b) { | |
| 498 _in_collection_set = b; | |
| 499 } | |
| 500 HeapRegion* next_in_collection_set() { | |
| 501 assert(in_collection_set(), "should only invoke on member of CS."); | |
| 502 assert(_next_in_special_set == NULL || | |
| 503 _next_in_special_set->in_collection_set(), | |
| 504 "Malformed CS."); | |
| 505 return _next_in_special_set; | |
| 506 } | |
| 507 void set_next_in_collection_set(HeapRegion* r) { | |
| 508 assert(in_collection_set(), "should only invoke on member of CS."); | |
| 509 assert(r == NULL || r->in_collection_set(), "Malformed CS."); | |
| 510 _next_in_special_set = r; | |
| 511 } | |
| 512 | |
| 2152 | 513 // Methods used by the HeapRegionSetBase class and subclasses. |
| 342 | 514 |
| 2152 | 515 // Getter and setter for the next field used to link regions into |
| 516 // linked lists. | |
| 517 HeapRegion* next() { return _next; } | |
| 518 | |
| 519 void set_next(HeapRegion* next) { _next = next; } | |
| 342 | 520 |
| 2152 | 521 // Every region added to a set is tagged with a reference to that |
| 522 // set. This is used for doing consistency checking to make sure that | |
| 523 // the contents of a set are as they should be and it's only | |
| 524 // available in non-product builds. | |
| 525 #ifdef ASSERT | |
| 526 void set_containing_set(HeapRegionSetBase* containing_set) { | |
| 527 assert((containing_set == NULL && _containing_set != NULL) || | |
| 528 (containing_set != NULL && _containing_set == NULL), | |
| 529 err_msg("containing_set: "PTR_FORMAT" " | |
| 530 "_containing_set: "PTR_FORMAT, | |
| 531 containing_set, _containing_set)); | |
| 532 | |
| 533 _containing_set = containing_set; | |
| 2361 | 534 } |
| 342 | 535 |
| 2152 | 536 HeapRegionSetBase* containing_set() { return _containing_set; } |
| 537 #else // ASSERT | |
| 538 void set_containing_set(HeapRegionSetBase* containing_set) { } | |
| 342 | 539 |
| 2361 | 540 // containing_set() is only used in asserts so there's no reason |
| 2152 | 541 // to provide a dummy version of it. |
| 542 #endif // ASSERT | |
| 342 | 543 |
| 2152 | 544 // If we want to remove regions from a list in bulk we can simply tag |
| 545 // them with the pending_removal tag and call the | |
| 546 // remove_all_pending() method on the list. | |
| 342 | 547 |
| 2152 | 548 bool pending_removal() { return _pending_removal; } |
| 549 | |
| 550 void set_pending_removal(bool pending_removal) { | |
| 2361 | 551 if (pending_removal) { |
| 552 assert(!_pending_removal && containing_set() != NULL, | |
| 553 "can only set pending removal to true if it's false and " | |
| 554 "the region belongs to a region set"); | |
| 555 } else { | |
| 556 assert( _pending_removal && containing_set() == NULL, | |
| 557 "can only set pending removal to false if it's true and " | |
| 558 "the region does not belong to a region set"); | |
| 559 } | |
| 2152 | 560 |
| 561 _pending_removal = pending_removal; | |
| 342 | 562 } |
| 563 | |
| 564 HeapRegion* get_next_young_region() { return _next_young_region; } | |
| 565 void set_next_young_region(HeapRegion* hr) { | |
| 566 _next_young_region = hr; | |
| 567 } | |
| 568 | |
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569 HeapRegion* get_next_dirty_cards_region() const { return _next_dirty_cards_region; } |
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570 HeapRegion** next_dirty_cards_region_addr() { return &_next_dirty_cards_region; } |
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571 void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; } |
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572 bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; } |
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573 |
| 3766 | 574 HeapWord* orig_end() { return _orig_end; } |
| 575 | |
| 342 | 576 // Allows logical separation between objects allocated before and after. |
| 577 void save_marks(); | |
| 578 | |
| 579 // Reset HR stuff to default values. | |
| 580 void hr_clear(bool par, bool clear_space); | |
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581 void par_clear(); |
| 342 | 582 |
| 356 | 583 void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
| 342 | 584 |
| 585 // Get the start of the unmarked area in this region. | |
| 586 HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } | |
| 587 HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } | |
| 588 | |
| 589 // Apply "cl->do_oop" to (the addresses of) all reference fields in objects | |
| 590 // allocated in the current region before the last call to "save_mark". | |
| 591 void oop_before_save_marks_iterate(OopClosure* cl); | |
| 592 | |
| 593 // Note the start or end of marking. This tells the heap region | |
| 594 // that the collector is about to start or has finished (concurrently) | |
| 595 // marking the heap. | |
| 596 | |
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597 // Notify the region that concurrent marking is starting. Initialize |
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598 // all fields related to the next marking info. |
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599 inline void note_start_of_marking(); |
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600 |
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601 // Notify the region that concurrent marking has finished. Copy the |
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602 // (now finalized) next marking info fields into the prev marking |
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603 // info fields. |
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604 inline void note_end_of_marking(); |
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605 |
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606 // Notify the region that it will be used as to-space during a GC |
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607 // and we are about to start copying objects into it. |
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608 inline void note_start_of_copying(bool during_initial_mark); |
| 342 | 609 |
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610 // Notify the region that it ceases being to-space during a GC and |
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611 // we will not copy objects into it any more. |
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612 inline void note_end_of_copying(bool during_initial_mark); |
| 342 | 613 |
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614 // Notify the region that we are about to start processing |
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615 // self-forwarded objects during evac failure handling. |
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616 void note_self_forwarding_removal_start(bool during_initial_mark, |
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617 bool during_conc_mark); |
| 342 | 618 |
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619 // Notify the region that we have finished processing self-forwarded |
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620 // objects during evac failure handling. |
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621 void note_self_forwarding_removal_end(bool during_initial_mark, |
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622 bool during_conc_mark, |
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623 size_t marked_bytes); |
| 342 | 624 |
| 625 // Returns "false" iff no object in the region was allocated when the | |
| 626 // last mark phase ended. | |
| 627 bool is_marked() { return _prev_top_at_mark_start != bottom(); } | |
| 628 | |
| 629 // If "is_marked()" is true, then this is the index of the region in | |
| 630 // an array constructed at the end of marking of the regions in a | |
| 631 // "desirability" order. | |
| 632 int sort_index() { | |
| 633 return _sort_index; | |
| 634 } | |
| 635 void set_sort_index(int i) { | |
| 636 _sort_index = i; | |
| 637 } | |
| 638 | |
| 639 void init_top_at_conc_mark_count() { | |
| 640 _top_at_conc_mark_count = bottom(); | |
| 641 } | |
| 642 | |
| 643 void set_top_at_conc_mark_count(HeapWord *cur) { | |
| 644 assert(bottom() <= cur && cur <= end(), "Sanity."); | |
| 645 _top_at_conc_mark_count = cur; | |
| 646 } | |
| 647 | |
| 648 HeapWord* top_at_conc_mark_count() { | |
| 649 return _top_at_conc_mark_count; | |
| 650 } | |
| 651 | |
| 652 void reset_during_compaction() { | |
| 653 guarantee( isHumongous() && startsHumongous(), | |
| 654 "should only be called for humongous regions"); | |
| 655 | |
| 656 zero_marked_bytes(); | |
| 657 init_top_at_mark_start(); | |
| 658 } | |
| 659 | |
| 660 void calc_gc_efficiency(void); | |
| 661 double gc_efficiency() { return _gc_efficiency;} | |
| 662 | |
| 663 bool is_young() const { return _young_type != NotYoung; } | |
| 664 bool is_survivor() const { return _young_type == Survivor; } | |
| 665 | |
| 666 int young_index_in_cset() const { return _young_index_in_cset; } | |
| 667 void set_young_index_in_cset(int index) { | |
| 668 assert( (index == -1) || is_young(), "pre-condition" ); | |
| 669 _young_index_in_cset = index; | |
| 670 } | |
| 671 | |
| 672 int age_in_surv_rate_group() { | |
| 673 assert( _surv_rate_group != NULL, "pre-condition" ); | |
| 674 assert( _age_index > -1, "pre-condition" ); | |
| 675 return _surv_rate_group->age_in_group(_age_index); | |
| 676 } | |
| 677 | |
| 678 void record_surv_words_in_group(size_t words_survived) { | |
| 679 assert( _surv_rate_group != NULL, "pre-condition" ); | |
| 680 assert( _age_index > -1, "pre-condition" ); | |
| 681 int age_in_group = age_in_surv_rate_group(); | |
| 682 _surv_rate_group->record_surviving_words(age_in_group, words_survived); | |
| 683 } | |
| 684 | |
| 685 int age_in_surv_rate_group_cond() { | |
| 686 if (_surv_rate_group != NULL) | |
| 687 return age_in_surv_rate_group(); | |
| 688 else | |
| 689 return -1; | |
| 690 } | |
| 691 | |
| 692 SurvRateGroup* surv_rate_group() { | |
| 693 return _surv_rate_group; | |
| 694 } | |
| 695 | |
| 696 void install_surv_rate_group(SurvRateGroup* surv_rate_group) { | |
| 697 assert( surv_rate_group != NULL, "pre-condition" ); | |
| 698 assert( _surv_rate_group == NULL, "pre-condition" ); | |
| 699 assert( is_young(), "pre-condition" ); | |
| 700 | |
| 701 _surv_rate_group = surv_rate_group; | |
| 702 _age_index = surv_rate_group->next_age_index(); | |
| 703 } | |
| 704 | |
| 705 void uninstall_surv_rate_group() { | |
| 706 if (_surv_rate_group != NULL) { | |
| 707 assert( _age_index > -1, "pre-condition" ); | |
| 708 assert( is_young(), "pre-condition" ); | |
| 709 | |
| 710 _surv_rate_group = NULL; | |
| 711 _age_index = -1; | |
| 712 } else { | |
| 713 assert( _age_index == -1, "pre-condition" ); | |
| 714 } | |
| 715 } | |
| 716 | |
| 717 void set_young() { set_young_type(Young); } | |
| 718 | |
| 719 void set_survivor() { set_young_type(Survivor); } | |
| 720 | |
| 721 void set_not_young() { set_young_type(NotYoung); } | |
| 722 | |
| 723 // Determine if an object has been allocated since the last | |
| 724 // mark performed by the collector. This returns true iff the object | |
| 725 // is within the unmarked area of the region. | |
| 726 bool obj_allocated_since_prev_marking(oop obj) const { | |
| 727 return (HeapWord *) obj >= prev_top_at_mark_start(); | |
| 728 } | |
| 729 bool obj_allocated_since_next_marking(oop obj) const { | |
| 730 return (HeapWord *) obj >= next_top_at_mark_start(); | |
| 731 } | |
| 732 | |
| 733 // For parallel heapRegion traversal. | |
| 734 bool claimHeapRegion(int claimValue); | |
| 735 jint claim_value() { return _claimed; } | |
| 736 // Use this carefully: only when you're sure no one is claiming... | |
| 737 void set_claim_value(int claimValue) { _claimed = claimValue; } | |
| 738 | |
| 739 // Returns the "evacuation_failed" property of the region. | |
| 740 bool evacuation_failed() { return _evacuation_failed; } | |
| 741 | |
| 742 // Sets the "evacuation_failed" property of the region. | |
| 743 void set_evacuation_failed(bool b) { | |
| 744 _evacuation_failed = b; | |
| 745 | |
| 746 if (b) { | |
| 747 init_top_at_conc_mark_count(); | |
| 748 _next_marked_bytes = 0; | |
| 749 } | |
| 750 } | |
| 751 | |
| 752 // Requires that "mr" be entirely within the region. | |
| 753 // Apply "cl->do_object" to all objects that intersect with "mr". | |
| 754 // If the iteration encounters an unparseable portion of the region, | |
| 755 // or if "cl->abort()" is true after a closure application, | |
| 756 // terminate the iteration and return the address of the start of the | |
| 757 // subregion that isn't done. (The two can be distinguished by querying | |
| 758 // "cl->abort()".) Return of "NULL" indicates that the iteration | |
| 759 // completed. | |
| 760 HeapWord* | |
| 761 object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); | |
| 762 | |
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763 // filter_young: if true and the region is a young region then we |
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764 // skip the iteration. |
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765 // card_ptr: if not NULL, and we decide that the card is not young |
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766 // and we iterate over it, we'll clean the card before we start the |
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767 // iteration. |
| 342 | 768 HeapWord* |
| 769 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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770 FilterOutOfRegionClosure* cl, |
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771 bool filter_young, |
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772 jbyte* card_ptr); |
| 342 | 773 |
| 774 // A version of block start that is guaranteed to find *some* block | |
| 775 // boundary at or before "p", but does not object iteration, and may | |
| 776 // therefore be used safely when the heap is unparseable. | |
| 777 HeapWord* block_start_careful(const void* p) const { | |
| 778 return _offsets.block_start_careful(p); | |
| 779 } | |
| 780 | |
| 781 // Requires that "addr" is within the region. Returns the start of the | |
| 782 // first ("careful") block that starts at or after "addr", or else the | |
| 783 // "end" of the region if there is no such block. | |
| 784 HeapWord* next_block_start_careful(HeapWord* addr); | |
| 785 | |
|
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786 size_t recorded_rs_length() const { return _recorded_rs_length; } |
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787 double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; } |
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788 size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; } |
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789 |
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790 void set_recorded_rs_length(size_t rs_length) { |
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791 _recorded_rs_length = rs_length; |
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792 } |
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793 |
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794 void set_predicted_elapsed_time_ms(double ms) { |
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795 _predicted_elapsed_time_ms = ms; |
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796 } |
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797 |
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798 void set_predicted_bytes_to_copy(size_t bytes) { |
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799 _predicted_bytes_to_copy = bytes; |
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800 } |
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801 |
| 342 | 802 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ |
| 803 virtual void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
| 804 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DECL) | |
| 805 | |
| 806 CompactibleSpace* next_compaction_space() const; | |
| 807 | |
| 808 virtual void reset_after_compaction(); | |
| 809 | |
| 810 void print() const; | |
| 811 void print_on(outputStream* st) const; | |
| 812 | |
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813 // vo == UsePrevMarking -> use "prev" marking information, |
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814 // vo == UseNextMarking -> use "next" marking information |
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815 // vo == UseMarkWord -> use the mark word in the object header |
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816 // |
| 811 | 817 // NOTE: Only the "prev" marking information is guaranteed to be |
| 818 // consistent most of the time, so most calls to this should use | |
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819 // vo == UsePrevMarking. |
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820 // Currently, there is only one case where this is called with |
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821 // vo == UseNextMarking, which is to verify the "next" marking |
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822 // information at the end of remark. |
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823 // Currently there is only one place where this is called with |
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824 // vo == UseMarkWord, which is to verify the marking during a |
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825 // full GC. |
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6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
3766
diff
changeset
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826 void verify(bool allow_dirty, VerifyOption vo, bool *failures) const; |
| 811 | 827 |
| 828 // Override; it uses the "prev" marking information | |
| 342 | 829 virtual void verify(bool allow_dirty) const; |
| 830 }; | |
| 831 | |
| 832 // HeapRegionClosure is used for iterating over regions. | |
| 833 // Terminates the iteration when the "doHeapRegion" method returns "true". | |
| 834 class HeapRegionClosure : public StackObj { | |
| 835 friend class HeapRegionSeq; | |
| 836 friend class G1CollectedHeap; | |
| 837 | |
| 838 bool _complete; | |
| 839 void incomplete() { _complete = false; } | |
| 840 | |
| 841 public: | |
| 842 HeapRegionClosure(): _complete(true) {} | |
| 843 | |
| 844 // Typically called on each region until it returns true. | |
| 845 virtual bool doHeapRegion(HeapRegion* r) = 0; | |
| 846 | |
| 847 // True after iteration if the closure was applied to all heap regions | |
| 848 // and returned "false" in all cases. | |
| 849 bool complete() { return _complete; } | |
| 850 }; | |
| 851 | |
| 852 #endif // SERIALGC | |
| 1972 | 853 |
| 854 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |