Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.hpp @ 1838:8f6f7587d292
6988678: fatal error deadlock handling was unintentionally disabled
Reviewed-by: ysr
| author | jcoomes |
|---|---|
| date | Thu, 30 Sep 2010 12:15:13 -0700 |
| parents | 5cbac8938c4c |
| children | 72a161e62cc4 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2010, 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 | |
| 25 #ifndef SERIALGC | |
| 26 | |
| 27 // A HeapRegion is the smallest piece of a G1CollectedHeap that | |
| 28 // can be collected independently. | |
| 29 | |
| 30 // NOTE: Although a HeapRegion is a Space, its | |
| 31 // Space::initDirtyCardClosure method must not be called. | |
| 32 // The problem is that the existence of this method breaks | |
| 33 // the independence of barrier sets from remembered sets. | |
| 34 // The solution is to remove this method from the definition | |
| 35 // of a Space. | |
| 36 | |
| 37 class CompactibleSpace; | |
| 38 class ContiguousSpace; | |
| 39 class HeapRegionRemSet; | |
| 40 class HeapRegionRemSetIterator; | |
| 41 class HeapRegion; | |
| 42 | |
| 43 // A dirty card to oop closure for heap regions. It | |
| 44 // knows how to get the G1 heap and how to use the bitmap | |
| 45 // in the concurrent marker used by G1 to filter remembered | |
| 46 // sets. | |
| 47 | |
| 48 class HeapRegionDCTOC : public ContiguousSpaceDCTOC { | |
| 49 public: | |
| 50 // Specification of possible DirtyCardToOopClosure filtering. | |
| 51 enum FilterKind { | |
| 52 NoFilterKind, | |
| 53 IntoCSFilterKind, | |
| 54 OutOfRegionFilterKind | |
| 55 }; | |
| 56 | |
| 57 protected: | |
| 58 HeapRegion* _hr; | |
| 59 FilterKind _fk; | |
| 60 G1CollectedHeap* _g1; | |
| 61 | |
| 62 void walk_mem_region_with_cl(MemRegion mr, | |
| 63 HeapWord* bottom, HeapWord* top, | |
| 64 OopClosure* cl); | |
| 65 | |
| 66 // We don't specialize this for FilteringClosure; filtering is handled by | |
| 67 // the "FilterKind" mechanism. But we provide this to avoid a compiler | |
| 68 // warning. | |
| 69 void walk_mem_region_with_cl(MemRegion mr, | |
| 70 HeapWord* bottom, HeapWord* top, | |
| 71 FilteringClosure* cl) { | |
| 72 HeapRegionDCTOC::walk_mem_region_with_cl(mr, bottom, top, | |
| 73 (OopClosure*)cl); | |
| 74 } | |
| 75 | |
| 76 // Get the actual top of the area on which the closure will | |
| 77 // operate, given where the top is assumed to be (the end of the | |
| 78 // memory region passed to do_MemRegion) and where the object | |
| 79 // at the top is assumed to start. For example, an object may | |
| 80 // start at the top but actually extend past the assumed top, | |
| 81 // in which case the top becomes the end of the object. | |
| 82 HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj) { | |
| 83 return ContiguousSpaceDCTOC::get_actual_top(top, top_obj); | |
| 84 } | |
| 85 | |
| 86 // Walk the given memory region from bottom to (actual) top | |
| 87 // looking for objects and applying the oop closure (_cl) to | |
| 88 // them. The base implementation of this treats the area as | |
| 89 // blocks, where a block may or may not be an object. Sub- | |
| 90 // classes should override this to provide more accurate | |
| 91 // or possibly more efficient walking. | |
| 92 void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top) { | |
| 93 Filtering_DCTOC::walk_mem_region(mr, bottom, top); | |
| 94 } | |
| 95 | |
| 96 public: | |
| 97 HeapRegionDCTOC(G1CollectedHeap* g1, | |
| 98 HeapRegion* hr, OopClosure* cl, | |
| 99 CardTableModRefBS::PrecisionStyle precision, | |
| 100 FilterKind fk); | |
| 101 }; | |
| 102 | |
| 103 | |
| 104 // The complicating factor is that BlockOffsetTable diverged | |
| 105 // significantly, and we need functionality that is only in the G1 version. | |
| 106 // So I copied that code, which led to an alternate G1 version of | |
| 107 // OffsetTableContigSpace. If the two versions of BlockOffsetTable could | |
| 108 // be reconciled, then G1OffsetTableContigSpace could go away. | |
| 109 | |
| 110 // The idea behind time stamps is the following. Doing a save_marks on | |
| 111 // all regions at every GC pause is time consuming (if I remember | |
| 112 // well, 10ms or so). So, we would like to do that only for regions | |
| 113 // that are GC alloc regions. To achieve this, we use time | |
| 114 // stamps. For every evacuation pause, G1CollectedHeap generates a | |
| 115 // unique time stamp (essentially a counter that gets | |
| 116 // incremented). Every time we want to call save_marks on a region, | |
| 117 // we set the saved_mark_word to top and also copy the current GC | |
| 118 // time stamp to the time stamp field of the space. Reading the | |
| 119 // saved_mark_word involves checking the time stamp of the | |
| 120 // region. If it is the same as the current GC time stamp, then we | |
| 121 // can safely read the saved_mark_word field, as it is valid. If the | |
| 122 // time stamp of the region is not the same as the current GC time | |
| 123 // stamp, then we instead read top, as the saved_mark_word field is | |
| 124 // invalid. Time stamps (on the regions and also on the | |
| 125 // G1CollectedHeap) are reset at every cleanup (we iterate over | |
| 126 // the regions anyway) and at the end of a Full GC. The current scheme | |
| 127 // that uses sequential unsigned ints will fail only if we have 4b | |
| 128 // evacuation pauses between two cleanups, which is _highly_ unlikely. | |
| 129 | |
| 130 class G1OffsetTableContigSpace: public ContiguousSpace { | |
| 131 friend class VMStructs; | |
| 132 protected: | |
| 133 G1BlockOffsetArrayContigSpace _offsets; | |
| 134 Mutex _par_alloc_lock; | |
| 135 volatile unsigned _gc_time_stamp; | |
| 136 | |
| 137 public: | |
| 138 // Constructor. If "is_zeroed" is true, the MemRegion "mr" may be | |
| 139 // assumed to contain zeros. | |
| 140 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
| 141 MemRegion mr, bool is_zeroed = false); | |
| 142 | |
| 143 void set_bottom(HeapWord* value); | |
| 144 void set_end(HeapWord* value); | |
| 145 | |
| 146 virtual HeapWord* saved_mark_word() const; | |
| 147 virtual void set_saved_mark(); | |
| 148 void reset_gc_time_stamp() { _gc_time_stamp = 0; } | |
| 149 | |
| 356 | 150 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
| 151 virtual void clear(bool mangle_space); | |
| 342 | 152 |
| 153 HeapWord* block_start(const void* p); | |
| 154 HeapWord* block_start_const(const void* p) const; | |
| 155 | |
| 156 // Add offset table update. | |
| 157 virtual HeapWord* allocate(size_t word_size); | |
| 158 HeapWord* par_allocate(size_t word_size); | |
| 159 | |
| 160 // MarkSweep support phase3 | |
| 161 virtual HeapWord* initialize_threshold(); | |
| 162 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
| 163 | |
| 164 virtual void print() const; | |
| 165 }; | |
| 166 | |
| 167 class HeapRegion: public G1OffsetTableContigSpace { | |
| 168 friend class VMStructs; | |
| 169 private: | |
| 170 | |
| 355 | 171 enum HumongousType { |
| 172 NotHumongous = 0, | |
| 173 StartsHumongous, | |
| 174 ContinuesHumongous | |
| 175 }; | |
| 176 | |
| 342 | 177 // The next filter kind that should be used for a "new_dcto_cl" call with |
| 178 // the "traditional" signature. | |
| 179 HeapRegionDCTOC::FilterKind _next_fk; | |
| 180 | |
| 181 // Requires that the region "mr" be dense with objects, and begin and end | |
| 182 // with an object. | |
| 183 void oops_in_mr_iterate(MemRegion mr, OopClosure* cl); | |
| 184 | |
| 185 // The remembered set for this region. | |
| 186 // (Might want to make this "inline" later, to avoid some alloc failure | |
| 187 // issues.) | |
| 188 HeapRegionRemSet* _rem_set; | |
| 189 | |
| 190 G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } | |
| 191 | |
| 192 protected: | |
| 193 // If this region is a member of a HeapRegionSeq, the index in that | |
| 194 // sequence, otherwise -1. | |
| 195 int _hrs_index; | |
| 196 | |
| 355 | 197 HumongousType _humongous_type; |
| 342 | 198 // For a humongous region, region in which it starts. |
| 199 HeapRegion* _humongous_start_region; | |
| 200 // For the start region of a humongous sequence, it's original end(). | |
| 201 HeapWord* _orig_end; | |
| 202 | |
| 203 // True iff the region is in current collection_set. | |
| 204 bool _in_collection_set; | |
| 205 | |
| 206 // True iff the region is on the unclean list, waiting to be zero filled. | |
| 207 bool _is_on_unclean_list; | |
| 208 | |
| 209 // True iff the region is on the free list, ready for allocation. | |
| 210 bool _is_on_free_list; | |
| 211 | |
| 212 // Is this or has it been an allocation region in the current collection | |
| 213 // pause. | |
| 214 bool _is_gc_alloc_region; | |
| 215 | |
| 216 // True iff an attempt to evacuate an object in the region failed. | |
| 217 bool _evacuation_failed; | |
| 218 | |
| 219 // A heap region may be a member one of a number of special subsets, each | |
| 220 // represented as linked lists through the field below. Currently, these | |
| 221 // sets include: | |
| 222 // The collection set. | |
| 223 // The set of allocation regions used in a collection pause. | |
| 224 // Spaces that may contain gray objects. | |
| 225 HeapRegion* _next_in_special_set; | |
| 226 | |
| 227 // next region in the young "generation" region set | |
| 228 HeapRegion* _next_young_region; | |
| 229 | |
|
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230 // Next region whose cards need cleaning |
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231 HeapRegion* _next_dirty_cards_region; |
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232 |
| 342 | 233 // For parallel heapRegion traversal. |
| 234 jint _claimed; | |
| 235 | |
| 236 // We use concurrent marking to determine the amount of live data | |
| 237 // in each heap region. | |
| 238 size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. | |
| 239 size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. | |
| 240 | |
| 241 // See "sort_index" method. -1 means is not in the array. | |
| 242 int _sort_index; | |
| 243 | |
| 244 // <PREDICTION> | |
| 245 double _gc_efficiency; | |
| 246 // </PREDICTION> | |
| 247 | |
| 248 enum YoungType { | |
| 249 NotYoung, // a region is not young | |
| 250 Young, // a region is young | |
| 251 Survivor // a region is young and it contains | |
| 252 // survivor | |
| 253 }; | |
| 254 | |
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255 volatile YoungType _young_type; |
| 342 | 256 int _young_index_in_cset; |
| 257 SurvRateGroup* _surv_rate_group; | |
| 258 int _age_index; | |
| 259 | |
| 260 // The start of the unmarked area. The unmarked area extends from this | |
| 261 // word until the top and/or end of the region, and is the part | |
| 262 // of the region for which no marking was done, i.e. objects may | |
| 263 // have been allocated in this part since the last mark phase. | |
| 264 // "prev" is the top at the start of the last completed marking. | |
| 265 // "next" is the top at the start of the in-progress marking (if any.) | |
| 266 HeapWord* _prev_top_at_mark_start; | |
| 267 HeapWord* _next_top_at_mark_start; | |
| 268 // If a collection pause is in progress, this is the top at the start | |
| 269 // of that pause. | |
| 270 | |
| 271 // We've counted the marked bytes of objects below here. | |
| 272 HeapWord* _top_at_conc_mark_count; | |
| 273 | |
| 274 void init_top_at_mark_start() { | |
| 275 assert(_prev_marked_bytes == 0 && | |
| 276 _next_marked_bytes == 0, | |
| 277 "Must be called after zero_marked_bytes."); | |
| 278 HeapWord* bot = bottom(); | |
| 279 _prev_top_at_mark_start = bot; | |
| 280 _next_top_at_mark_start = bot; | |
| 281 _top_at_conc_mark_count = bot; | |
| 282 } | |
| 283 | |
| 284 jint _zfs; // A member of ZeroFillState. Protected by ZF_lock. | |
| 285 Thread* _zero_filler; // If _zfs is ZeroFilling, the thread that (last) | |
| 286 // made it so. | |
| 287 | |
| 288 void set_young_type(YoungType new_type) { | |
| 289 //assert(_young_type != new_type, "setting the same type" ); | |
| 290 // TODO: add more assertions here | |
| 291 _young_type = new_type; | |
| 292 } | |
| 293 | |
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294 // Cached attributes used in the collection set policy information |
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295 |
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296 // The RSet length that was added to the total value |
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297 // for the collection set. |
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298 size_t _recorded_rs_length; |
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299 |
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300 // The predicted elapsed time that was added to total value |
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301 // for the collection set. |
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302 double _predicted_elapsed_time_ms; |
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303 |
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304 // The predicted number of bytes to copy that was added to |
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305 // the total value for the collection set. |
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306 size_t _predicted_bytes_to_copy; |
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307 |
| 342 | 308 public: |
| 309 // If "is_zeroed" is "true", the region "mr" can be assumed to contain zeros. | |
| 310 HeapRegion(G1BlockOffsetSharedArray* sharedOffsetArray, | |
| 311 MemRegion mr, bool is_zeroed); | |
| 312 | |
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313 static int LogOfHRGrainBytes; |
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314 static int LogOfHRGrainWords; |
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315 // The normal type of these should be size_t. However, they used to |
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316 // be members of an enum before and they are assumed by the |
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317 // compilers to be ints. To avoid going and fixing all their uses, |
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318 // I'm declaring them as ints. I'm not anticipating heap region |
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319 // sizes to reach anywhere near 2g, so using an int here is safe. |
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320 static int GrainBytes; |
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321 static int GrainWords; |
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322 static int CardsPerRegion; |
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323 |
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324 // It sets up the heap region size (GrainBytes / GrainWords), as |
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325 // well as other related fields that are based on the heap region |
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326 // size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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327 // CardsPerRegion). All those fields are considered constant |
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328 // throughout the JVM's execution, therefore they should only be set |
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329 // up once during initialization time. |
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330 static void setup_heap_region_size(uintx min_heap_size); |
| 342 | 331 |
| 355 | 332 enum ClaimValues { |
| 333 InitialClaimValue = 0, | |
| 334 FinalCountClaimValue = 1, | |
| 335 NoteEndClaimValue = 2, | |
| 390 | 336 ScrubRemSetClaimValue = 3, |
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337 ParVerifyClaimValue = 4, |
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338 RebuildRSClaimValue = 5 |
| 355 | 339 }; |
| 340 | |
| 342 | 341 // Concurrent refinement requires contiguous heap regions (in which TLABs |
| 342 // might be allocated) to be zero-filled. Each region therefore has a | |
| 343 // zero-fill-state. | |
| 344 enum ZeroFillState { | |
| 345 NotZeroFilled, | |
| 346 ZeroFilling, | |
| 347 ZeroFilled, | |
| 348 Allocated | |
| 349 }; | |
| 350 | |
| 351 // If this region is a member of a HeapRegionSeq, the index in that | |
| 352 // sequence, otherwise -1. | |
| 353 int hrs_index() const { return _hrs_index; } | |
| 354 void set_hrs_index(int index) { _hrs_index = index; } | |
| 355 | |
| 356 // The number of bytes marked live in the region in the last marking phase. | |
| 357 size_t marked_bytes() { return _prev_marked_bytes; } | |
| 358 // The number of bytes counted in the next marking. | |
| 359 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 360 // The number of bytes live wrt the next marking. | |
| 361 size_t next_live_bytes() { | |
| 362 return (top() - next_top_at_mark_start()) | |
| 363 * HeapWordSize | |
| 364 + next_marked_bytes(); | |
| 365 } | |
| 366 | |
| 367 // A lower bound on the amount of garbage bytes in the region. | |
| 368 size_t garbage_bytes() { | |
| 369 size_t used_at_mark_start_bytes = | |
| 370 (prev_top_at_mark_start() - bottom()) * HeapWordSize; | |
| 371 assert(used_at_mark_start_bytes >= marked_bytes(), | |
| 372 "Can't mark more than we have."); | |
| 373 return used_at_mark_start_bytes - marked_bytes(); | |
| 374 } | |
| 375 | |
| 376 // An upper bound on the number of live bytes in the region. | |
| 377 size_t max_live_bytes() { return used() - garbage_bytes(); } | |
| 378 | |
| 379 void add_to_marked_bytes(size_t incr_bytes) { | |
| 380 _next_marked_bytes = _next_marked_bytes + incr_bytes; | |
| 381 guarantee( _next_marked_bytes <= used(), "invariant" ); | |
| 382 } | |
| 383 | |
| 384 void zero_marked_bytes() { | |
| 385 _prev_marked_bytes = _next_marked_bytes = 0; | |
| 386 } | |
| 387 | |
| 355 | 388 bool isHumongous() const { return _humongous_type != NotHumongous; } |
| 389 bool startsHumongous() const { return _humongous_type == StartsHumongous; } | |
| 390 bool continuesHumongous() const { return _humongous_type == ContinuesHumongous; } | |
| 342 | 391 // For a humongous region, region in which it starts. |
| 392 HeapRegion* humongous_start_region() const { | |
| 393 return _humongous_start_region; | |
| 394 } | |
| 395 | |
| 396 // Causes the current region to represent a humongous object spanning "n" | |
| 397 // regions. | |
| 398 virtual void set_startsHumongous(); | |
| 399 | |
| 400 // The regions that continue a humongous sequence should be added using | |
| 401 // this method, in increasing address order. | |
| 402 void set_continuesHumongous(HeapRegion* start); | |
| 403 | |
| 404 void add_continuingHumongousRegion(HeapRegion* cont); | |
| 405 | |
| 406 // If the region has a remembered set, return a pointer to it. | |
| 407 HeapRegionRemSet* rem_set() const { | |
| 408 return _rem_set; | |
| 409 } | |
| 410 | |
| 411 // True iff the region is in current collection_set. | |
| 412 bool in_collection_set() const { | |
| 413 return _in_collection_set; | |
| 414 } | |
| 415 void set_in_collection_set(bool b) { | |
| 416 _in_collection_set = b; | |
| 417 } | |
| 418 HeapRegion* next_in_collection_set() { | |
| 419 assert(in_collection_set(), "should only invoke on member of CS."); | |
| 420 assert(_next_in_special_set == NULL || | |
| 421 _next_in_special_set->in_collection_set(), | |
| 422 "Malformed CS."); | |
| 423 return _next_in_special_set; | |
| 424 } | |
| 425 void set_next_in_collection_set(HeapRegion* r) { | |
| 426 assert(in_collection_set(), "should only invoke on member of CS."); | |
| 427 assert(r == NULL || r->in_collection_set(), "Malformed CS."); | |
| 428 _next_in_special_set = r; | |
| 429 } | |
| 430 | |
| 431 // True iff it is or has been an allocation region in the current | |
| 432 // collection pause. | |
| 433 bool is_gc_alloc_region() const { | |
| 434 return _is_gc_alloc_region; | |
| 435 } | |
| 436 void set_is_gc_alloc_region(bool b) { | |
| 437 _is_gc_alloc_region = b; | |
| 438 } | |
| 439 HeapRegion* next_gc_alloc_region() { | |
| 440 assert(is_gc_alloc_region(), "should only invoke on member of CS."); | |
| 441 assert(_next_in_special_set == NULL || | |
| 442 _next_in_special_set->is_gc_alloc_region(), | |
| 443 "Malformed CS."); | |
| 444 return _next_in_special_set; | |
| 445 } | |
| 446 void set_next_gc_alloc_region(HeapRegion* r) { | |
| 447 assert(is_gc_alloc_region(), "should only invoke on member of CS."); | |
| 448 assert(r == NULL || r->is_gc_alloc_region(), "Malformed CS."); | |
| 449 _next_in_special_set = r; | |
| 450 } | |
| 451 | |
| 452 bool is_on_free_list() { | |
| 453 return _is_on_free_list; | |
| 454 } | |
| 455 | |
| 456 void set_on_free_list(bool b) { | |
| 457 _is_on_free_list = b; | |
| 458 } | |
| 459 | |
| 460 HeapRegion* next_from_free_list() { | |
| 461 assert(is_on_free_list(), | |
| 462 "Should only invoke on free space."); | |
| 463 assert(_next_in_special_set == NULL || | |
| 464 _next_in_special_set->is_on_free_list(), | |
| 465 "Malformed Free List."); | |
| 466 return _next_in_special_set; | |
| 467 } | |
| 468 | |
| 469 void set_next_on_free_list(HeapRegion* r) { | |
| 470 assert(r == NULL || r->is_on_free_list(), "Malformed free list."); | |
| 471 _next_in_special_set = r; | |
| 472 } | |
| 473 | |
| 474 bool is_on_unclean_list() { | |
| 475 return _is_on_unclean_list; | |
| 476 } | |
| 477 | |
| 478 void set_on_unclean_list(bool b); | |
| 479 | |
| 480 HeapRegion* next_from_unclean_list() { | |
| 481 assert(is_on_unclean_list(), | |
| 482 "Should only invoke on unclean space."); | |
| 483 assert(_next_in_special_set == NULL || | |
| 484 _next_in_special_set->is_on_unclean_list(), | |
| 485 "Malformed unclean List."); | |
| 486 return _next_in_special_set; | |
| 487 } | |
| 488 | |
| 489 void set_next_on_unclean_list(HeapRegion* r); | |
| 490 | |
| 491 HeapRegion* get_next_young_region() { return _next_young_region; } | |
| 492 void set_next_young_region(HeapRegion* hr) { | |
| 493 _next_young_region = hr; | |
| 494 } | |
| 495 | |
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496 HeapRegion* get_next_dirty_cards_region() const { return _next_dirty_cards_region; } |
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497 HeapRegion** next_dirty_cards_region_addr() { return &_next_dirty_cards_region; } |
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498 void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; } |
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499 bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; } |
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500 |
| 342 | 501 // Allows logical separation between objects allocated before and after. |
| 502 void save_marks(); | |
| 503 | |
| 504 // Reset HR stuff to default values. | |
| 505 void hr_clear(bool par, bool clear_space); | |
| 506 | |
| 356 | 507 void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
| 342 | 508 |
| 509 // Ensure that "this" is zero-filled. | |
| 510 void ensure_zero_filled(); | |
| 511 // This one requires that the calling thread holds ZF_mon. | |
| 512 void ensure_zero_filled_locked(); | |
| 513 | |
| 514 // Get the start of the unmarked area in this region. | |
| 515 HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } | |
| 516 HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } | |
| 517 | |
| 518 // Apply "cl->do_oop" to (the addresses of) all reference fields in objects | |
| 519 // allocated in the current region before the last call to "save_mark". | |
| 520 void oop_before_save_marks_iterate(OopClosure* cl); | |
| 521 | |
| 522 // This call determines the "filter kind" argument that will be used for | |
| 523 // the next call to "new_dcto_cl" on this region with the "traditional" | |
| 524 // signature (i.e., the call below.) The default, in the absence of a | |
| 525 // preceding call to this method, is "NoFilterKind", and a call to this | |
| 526 // method is necessary for each such call, or else it reverts to the | |
| 527 // default. | |
| 528 // (This is really ugly, but all other methods I could think of changed a | |
| 529 // lot of main-line code for G1.) | |
| 530 void set_next_filter_kind(HeapRegionDCTOC::FilterKind nfk) { | |
| 531 _next_fk = nfk; | |
| 532 } | |
| 533 | |
| 534 DirtyCardToOopClosure* | |
| 535 new_dcto_closure(OopClosure* cl, | |
| 536 CardTableModRefBS::PrecisionStyle precision, | |
| 537 HeapRegionDCTOC::FilterKind fk); | |
| 538 | |
| 539 #if WHASSUP | |
| 540 DirtyCardToOopClosure* | |
| 541 new_dcto_closure(OopClosure* cl, | |
| 542 CardTableModRefBS::PrecisionStyle precision, | |
| 543 HeapWord* boundary) { | |
| 544 assert(boundary == NULL, "This arg doesn't make sense here."); | |
| 545 DirtyCardToOopClosure* res = new_dcto_closure(cl, precision, _next_fk); | |
| 546 _next_fk = HeapRegionDCTOC::NoFilterKind; | |
| 547 return res; | |
| 548 } | |
| 549 #endif | |
| 550 | |
| 551 // | |
| 552 // Note the start or end of marking. This tells the heap region | |
| 553 // that the collector is about to start or has finished (concurrently) | |
| 554 // marking the heap. | |
| 555 // | |
| 556 | |
| 557 // Note the start of a marking phase. Record the | |
| 558 // start of the unmarked area of the region here. | |
| 559 void note_start_of_marking(bool during_initial_mark) { | |
| 560 init_top_at_conc_mark_count(); | |
| 561 _next_marked_bytes = 0; | |
| 562 if (during_initial_mark && is_young() && !is_survivor()) | |
| 563 _next_top_at_mark_start = bottom(); | |
| 564 else | |
| 565 _next_top_at_mark_start = top(); | |
| 566 } | |
| 567 | |
| 568 // Note the end of a marking phase. Install the start of | |
| 569 // the unmarked area that was captured at start of marking. | |
| 570 void note_end_of_marking() { | |
| 571 _prev_top_at_mark_start = _next_top_at_mark_start; | |
| 572 _prev_marked_bytes = _next_marked_bytes; | |
| 573 _next_marked_bytes = 0; | |
| 574 | |
| 575 guarantee(_prev_marked_bytes <= | |
| 576 (size_t) (prev_top_at_mark_start() - bottom()) * HeapWordSize, | |
| 577 "invariant"); | |
| 578 } | |
| 579 | |
| 580 // After an evacuation, we need to update _next_top_at_mark_start | |
| 581 // to be the current top. Note this is only valid if we have only | |
| 582 // ever evacuated into this region. If we evacuate, allocate, and | |
| 583 // then evacuate we are in deep doodoo. | |
| 584 void note_end_of_copying() { | |
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585 assert(top() >= _next_top_at_mark_start, "Increase only"); |
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586 _next_top_at_mark_start = top(); |
| 342 | 587 } |
| 588 | |
| 589 // Returns "false" iff no object in the region was allocated when the | |
| 590 // last mark phase ended. | |
| 591 bool is_marked() { return _prev_top_at_mark_start != bottom(); } | |
| 592 | |
| 593 // If "is_marked()" is true, then this is the index of the region in | |
| 594 // an array constructed at the end of marking of the regions in a | |
| 595 // "desirability" order. | |
| 596 int sort_index() { | |
| 597 return _sort_index; | |
| 598 } | |
| 599 void set_sort_index(int i) { | |
| 600 _sort_index = i; | |
| 601 } | |
| 602 | |
| 603 void init_top_at_conc_mark_count() { | |
| 604 _top_at_conc_mark_count = bottom(); | |
| 605 } | |
| 606 | |
| 607 void set_top_at_conc_mark_count(HeapWord *cur) { | |
| 608 assert(bottom() <= cur && cur <= end(), "Sanity."); | |
| 609 _top_at_conc_mark_count = cur; | |
| 610 } | |
| 611 | |
| 612 HeapWord* top_at_conc_mark_count() { | |
| 613 return _top_at_conc_mark_count; | |
| 614 } | |
| 615 | |
| 616 void reset_during_compaction() { | |
| 617 guarantee( isHumongous() && startsHumongous(), | |
| 618 "should only be called for humongous regions"); | |
| 619 | |
| 620 zero_marked_bytes(); | |
| 621 init_top_at_mark_start(); | |
| 622 } | |
| 623 | |
| 624 // <PREDICTION> | |
| 625 void calc_gc_efficiency(void); | |
| 626 double gc_efficiency() { return _gc_efficiency;} | |
| 627 // </PREDICTION> | |
| 628 | |
| 629 bool is_young() const { return _young_type != NotYoung; } | |
| 630 bool is_survivor() const { return _young_type == Survivor; } | |
| 631 | |
| 632 int young_index_in_cset() const { return _young_index_in_cset; } | |
| 633 void set_young_index_in_cset(int index) { | |
| 634 assert( (index == -1) || is_young(), "pre-condition" ); | |
| 635 _young_index_in_cset = index; | |
| 636 } | |
| 637 | |
| 638 int age_in_surv_rate_group() { | |
| 639 assert( _surv_rate_group != NULL, "pre-condition" ); | |
| 640 assert( _age_index > -1, "pre-condition" ); | |
| 641 return _surv_rate_group->age_in_group(_age_index); | |
| 642 } | |
| 643 | |
| 644 void record_surv_words_in_group(size_t words_survived) { | |
| 645 assert( _surv_rate_group != NULL, "pre-condition" ); | |
| 646 assert( _age_index > -1, "pre-condition" ); | |
| 647 int age_in_group = age_in_surv_rate_group(); | |
| 648 _surv_rate_group->record_surviving_words(age_in_group, words_survived); | |
| 649 } | |
| 650 | |
| 651 int age_in_surv_rate_group_cond() { | |
| 652 if (_surv_rate_group != NULL) | |
| 653 return age_in_surv_rate_group(); | |
| 654 else | |
| 655 return -1; | |
| 656 } | |
| 657 | |
| 658 SurvRateGroup* surv_rate_group() { | |
| 659 return _surv_rate_group; | |
| 660 } | |
| 661 | |
| 662 void install_surv_rate_group(SurvRateGroup* surv_rate_group) { | |
| 663 assert( surv_rate_group != NULL, "pre-condition" ); | |
| 664 assert( _surv_rate_group == NULL, "pre-condition" ); | |
| 665 assert( is_young(), "pre-condition" ); | |
| 666 | |
| 667 _surv_rate_group = surv_rate_group; | |
| 668 _age_index = surv_rate_group->next_age_index(); | |
| 669 } | |
| 670 | |
| 671 void uninstall_surv_rate_group() { | |
| 672 if (_surv_rate_group != NULL) { | |
| 673 assert( _age_index > -1, "pre-condition" ); | |
| 674 assert( is_young(), "pre-condition" ); | |
| 675 | |
| 676 _surv_rate_group = NULL; | |
| 677 _age_index = -1; | |
| 678 } else { | |
| 679 assert( _age_index == -1, "pre-condition" ); | |
| 680 } | |
| 681 } | |
| 682 | |
| 683 void set_young() { set_young_type(Young); } | |
| 684 | |
| 685 void set_survivor() { set_young_type(Survivor); } | |
| 686 | |
| 687 void set_not_young() { set_young_type(NotYoung); } | |
| 688 | |
| 689 // Determine if an object has been allocated since the last | |
| 690 // mark performed by the collector. This returns true iff the object | |
| 691 // is within the unmarked area of the region. | |
| 692 bool obj_allocated_since_prev_marking(oop obj) const { | |
| 693 return (HeapWord *) obj >= prev_top_at_mark_start(); | |
| 694 } | |
| 695 bool obj_allocated_since_next_marking(oop obj) const { | |
| 696 return (HeapWord *) obj >= next_top_at_mark_start(); | |
| 697 } | |
| 698 | |
| 699 // For parallel heapRegion traversal. | |
| 700 bool claimHeapRegion(int claimValue); | |
| 701 jint claim_value() { return _claimed; } | |
| 702 // Use this carefully: only when you're sure no one is claiming... | |
| 703 void set_claim_value(int claimValue) { _claimed = claimValue; } | |
| 704 | |
| 705 // Returns the "evacuation_failed" property of the region. | |
| 706 bool evacuation_failed() { return _evacuation_failed; } | |
| 707 | |
| 708 // Sets the "evacuation_failed" property of the region. | |
| 709 void set_evacuation_failed(bool b) { | |
| 710 _evacuation_failed = b; | |
| 711 | |
| 712 if (b) { | |
| 713 init_top_at_conc_mark_count(); | |
| 714 _next_marked_bytes = 0; | |
| 715 } | |
| 716 } | |
| 717 | |
| 718 // Requires that "mr" be entirely within the region. | |
| 719 // Apply "cl->do_object" to all objects that intersect with "mr". | |
| 720 // If the iteration encounters an unparseable portion of the region, | |
| 721 // or if "cl->abort()" is true after a closure application, | |
| 722 // terminate the iteration and return the address of the start of the | |
| 723 // subregion that isn't done. (The two can be distinguished by querying | |
| 724 // "cl->abort()".) Return of "NULL" indicates that the iteration | |
| 725 // completed. | |
| 726 HeapWord* | |
| 727 object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); | |
| 728 | |
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729 // In this version - if filter_young is true and the region |
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730 // is a young region then we skip the iteration. |
| 342 | 731 HeapWord* |
| 732 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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733 FilterOutOfRegionClosure* cl, |
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734 bool filter_young); |
| 342 | 735 |
| 736 // The region "mr" is entirely in "this", and starts and ends at block | |
| 737 // boundaries. The caller declares that all the contained blocks are | |
| 738 // coalesced into one. | |
| 739 void declare_filled_region_to_BOT(MemRegion mr) { | |
| 740 _offsets.single_block(mr.start(), mr.end()); | |
| 741 } | |
| 742 | |
| 743 // A version of block start that is guaranteed to find *some* block | |
| 744 // boundary at or before "p", but does not object iteration, and may | |
| 745 // therefore be used safely when the heap is unparseable. | |
| 746 HeapWord* block_start_careful(const void* p) const { | |
| 747 return _offsets.block_start_careful(p); | |
| 748 } | |
| 749 | |
| 750 // Requires that "addr" is within the region. Returns the start of the | |
| 751 // first ("careful") block that starts at or after "addr", or else the | |
| 752 // "end" of the region if there is no such block. | |
| 753 HeapWord* next_block_start_careful(HeapWord* addr); | |
| 754 | |
| 755 // Returns the zero-fill-state of the current region. | |
| 756 ZeroFillState zero_fill_state() { return (ZeroFillState)_zfs; } | |
| 757 bool zero_fill_is_allocated() { return _zfs == Allocated; } | |
| 758 Thread* zero_filler() { return _zero_filler; } | |
| 759 | |
| 760 // Indicate that the contents of the region are unknown, and therefore | |
| 761 // might require zero-filling. | |
| 762 void set_zero_fill_needed() { | |
| 763 set_zero_fill_state_work(NotZeroFilled); | |
| 764 } | |
| 765 void set_zero_fill_in_progress(Thread* t) { | |
| 766 set_zero_fill_state_work(ZeroFilling); | |
| 767 _zero_filler = t; | |
| 768 } | |
| 769 void set_zero_fill_complete(); | |
| 770 void set_zero_fill_allocated() { | |
| 771 set_zero_fill_state_work(Allocated); | |
| 772 } | |
| 773 | |
| 774 void set_zero_fill_state_work(ZeroFillState zfs); | |
| 775 | |
| 776 // This is called when a full collection shrinks the heap. | |
| 777 // We want to set the heap region to a value which says | |
| 778 // it is no longer part of the heap. For now, we'll let "NotZF" fill | |
| 779 // that role. | |
| 780 void reset_zero_fill() { | |
| 781 set_zero_fill_state_work(NotZeroFilled); | |
| 782 _zero_filler = NULL; | |
| 783 } | |
| 784 | |
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785 size_t recorded_rs_length() const { return _recorded_rs_length; } |
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786 double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; } |
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787 size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; } |
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788 |
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789 void set_recorded_rs_length(size_t rs_length) { |
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790 _recorded_rs_length = rs_length; |
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791 } |
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792 |
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793 void set_predicted_elapsed_time_ms(double ms) { |
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794 _predicted_elapsed_time_ms = ms; |
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795 } |
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796 |
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797 void set_predicted_bytes_to_copy(size_t bytes) { |
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798 _predicted_bytes_to_copy = bytes; |
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799 } |
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800 |
| 342 | 801 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ |
| 802 virtual void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
| 803 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DECL) | |
| 804 | |
| 805 CompactibleSpace* next_compaction_space() const; | |
| 806 | |
| 807 virtual void reset_after_compaction(); | |
| 808 | |
| 809 void print() const; | |
| 810 void print_on(outputStream* st) const; | |
| 811 | |
| 811 | 812 // use_prev_marking == true -> use "prev" marking information, |
| 813 // use_prev_marking == false -> use "next" marking information | |
| 814 // NOTE: Only the "prev" marking information is guaranteed to be | |
| 815 // consistent most of the time, so most calls to this should use | |
| 816 // use_prev_marking == true. Currently, there is only one case where | |
| 817 // this is called with use_prev_marking == false, which is to verify | |
| 818 // the "next" marking information at the end of remark. | |
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819 void verify(bool allow_dirty, bool use_prev_marking, bool *failures) const; |
| 811 | 820 |
| 821 // Override; it uses the "prev" marking information | |
| 342 | 822 virtual void verify(bool allow_dirty) const; |
| 823 | |
| 824 #ifdef DEBUG | |
| 825 HeapWord* allocate(size_t size); | |
| 826 #endif | |
| 827 }; | |
| 828 | |
| 829 // HeapRegionClosure is used for iterating over regions. | |
| 830 // Terminates the iteration when the "doHeapRegion" method returns "true". | |
| 831 class HeapRegionClosure : public StackObj { | |
| 832 friend class HeapRegionSeq; | |
| 833 friend class G1CollectedHeap; | |
| 834 | |
| 835 bool _complete; | |
| 836 void incomplete() { _complete = false; } | |
| 837 | |
| 838 public: | |
| 839 HeapRegionClosure(): _complete(true) {} | |
| 840 | |
| 841 // Typically called on each region until it returns true. | |
| 842 virtual bool doHeapRegion(HeapRegion* r) = 0; | |
| 843 | |
| 844 // True after iteration if the closure was applied to all heap regions | |
| 845 // and returned "false" in all cases. | |
| 846 bool complete() { return _complete; } | |
| 847 }; | |
| 848 | |
| 849 // A linked lists of heap regions. It leaves the "next" field | |
| 850 // unspecified; that's up to subtypes. | |
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851 class RegionList VALUE_OBJ_CLASS_SPEC { |
| 342 | 852 protected: |
| 853 virtual HeapRegion* get_next(HeapRegion* chr) = 0; | |
| 854 virtual void set_next(HeapRegion* chr, | |
| 855 HeapRegion* new_next) = 0; | |
| 856 | |
| 857 HeapRegion* _hd; | |
| 858 HeapRegion* _tl; | |
| 859 size_t _sz; | |
| 860 | |
| 861 // Protected constructor because this type is only meaningful | |
| 862 // when the _get/_set next functions are defined. | |
| 863 RegionList() : _hd(NULL), _tl(NULL), _sz(0) {} | |
| 864 public: | |
| 865 void reset() { | |
| 866 _hd = NULL; | |
| 867 _tl = NULL; | |
| 868 _sz = 0; | |
| 869 } | |
| 870 HeapRegion* hd() { return _hd; } | |
| 871 HeapRegion* tl() { return _tl; } | |
| 872 size_t sz() { return _sz; } | |
| 873 size_t length(); | |
| 874 | |
| 875 bool well_formed() { | |
| 876 return | |
| 877 ((hd() == NULL && tl() == NULL && sz() == 0) | |
| 878 || (hd() != NULL && tl() != NULL && sz() > 0)) | |
| 879 && (sz() == length()); | |
| 880 } | |
| 881 virtual void insert_before_head(HeapRegion* r); | |
| 882 void prepend_list(RegionList* new_list); | |
| 883 virtual HeapRegion* pop(); | |
| 884 void dec_sz() { _sz--; } | |
| 885 // Requires that "r" is an element of the list, and is not the tail. | |
| 886 void delete_after(HeapRegion* r); | |
| 887 }; | |
| 888 | |
| 889 class EmptyNonHRegionList: public RegionList { | |
| 890 protected: | |
| 891 // Protected constructor because this type is only meaningful | |
| 892 // when the _get/_set next functions are defined. | |
| 893 EmptyNonHRegionList() : RegionList() {} | |
| 894 | |
| 895 public: | |
| 896 void insert_before_head(HeapRegion* r) { | |
| 897 // assert(r->is_empty(), "Better be empty"); | |
| 898 assert(!r->isHumongous(), "Better not be humongous."); | |
| 899 RegionList::insert_before_head(r); | |
| 900 } | |
| 901 void prepend_list(EmptyNonHRegionList* new_list) { | |
| 902 // assert(new_list->hd() == NULL || new_list->hd()->is_empty(), | |
| 903 // "Better be empty"); | |
| 904 assert(new_list->hd() == NULL || !new_list->hd()->isHumongous(), | |
| 905 "Better not be humongous."); | |
| 906 // assert(new_list->tl() == NULL || new_list->tl()->is_empty(), | |
| 907 // "Better be empty"); | |
| 908 assert(new_list->tl() == NULL || !new_list->tl()->isHumongous(), | |
| 909 "Better not be humongous."); | |
| 910 RegionList::prepend_list(new_list); | |
| 911 } | |
| 912 }; | |
| 913 | |
| 914 class UncleanRegionList: public EmptyNonHRegionList { | |
| 915 public: | |
| 916 HeapRegion* get_next(HeapRegion* hr) { | |
| 917 return hr->next_from_unclean_list(); | |
| 918 } | |
| 919 void set_next(HeapRegion* hr, HeapRegion* new_next) { | |
| 920 hr->set_next_on_unclean_list(new_next); | |
| 921 } | |
| 922 | |
| 923 UncleanRegionList() : EmptyNonHRegionList() {} | |
| 924 | |
| 925 void insert_before_head(HeapRegion* r) { | |
| 926 assert(!r->is_on_free_list(), | |
| 927 "Better not already be on free list"); | |
| 928 assert(!r->is_on_unclean_list(), | |
| 929 "Better not already be on unclean list"); | |
| 930 r->set_zero_fill_needed(); | |
| 931 r->set_on_unclean_list(true); | |
| 932 EmptyNonHRegionList::insert_before_head(r); | |
| 933 } | |
| 934 void prepend_list(UncleanRegionList* new_list) { | |
| 935 assert(new_list->tl() == NULL || !new_list->tl()->is_on_free_list(), | |
| 936 "Better not already be on free list"); | |
| 937 assert(new_list->tl() == NULL || new_list->tl()->is_on_unclean_list(), | |
| 938 "Better already be marked as on unclean list"); | |
| 939 assert(new_list->hd() == NULL || !new_list->hd()->is_on_free_list(), | |
| 940 "Better not already be on free list"); | |
| 941 assert(new_list->hd() == NULL || new_list->hd()->is_on_unclean_list(), | |
| 942 "Better already be marked as on unclean list"); | |
| 943 EmptyNonHRegionList::prepend_list(new_list); | |
| 944 } | |
| 945 HeapRegion* pop() { | |
| 946 HeapRegion* res = RegionList::pop(); | |
| 947 if (res != NULL) res->set_on_unclean_list(false); | |
| 948 return res; | |
| 949 } | |
| 950 }; | |
| 951 | |
| 952 // Local Variables: *** | |
| 953 // c-indentation-style: gnu *** | |
| 954 // End: *** | |
| 955 | |
| 956 #endif // SERIALGC |