Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.hpp @ 20481:c02ec279b062
8057768: Make heap region region type in G1 HeapRegion explicit
Reviewed-by: brutisso, tschatzl
| author | brutisso |
|---|---|
| date | Tue, 16 Sep 2014 14:27:40 +0200 |
| parents | d35872270666 |
| children | 7baf47cb97cb |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2014, 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 | |
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28 #include "gc_implementation/g1/g1AllocationContext.hpp" |
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29 #include "gc_implementation/g1/g1BlockOffsetTable.hpp" |
| 1972 | 30 #include "gc_implementation/g1/g1_specialized_oop_closures.hpp" |
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31 #include "gc_implementation/g1/heapRegionType.hpp" |
| 1972 | 32 #include "gc_implementation/g1/survRateGroup.hpp" |
| 33 #include "gc_implementation/shared/ageTable.hpp" | |
| 34 #include "gc_implementation/shared/spaceDecorator.hpp" | |
| 35 #include "memory/space.inline.hpp" | |
| 36 #include "memory/watermark.hpp" | |
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37 #include "utilities/macros.hpp" |
| 1972 | 38 |
| 342 | 39 // A HeapRegion is the smallest piece of a G1CollectedHeap that |
| 40 // can be collected independently. | |
| 41 | |
| 42 // NOTE: Although a HeapRegion is a Space, its | |
| 43 // Space::initDirtyCardClosure method must not be called. | |
| 44 // The problem is that the existence of this method breaks | |
| 45 // the independence of barrier sets from remembered sets. | |
| 46 // The solution is to remove this method from the definition | |
| 47 // of a Space. | |
| 48 | |
| 49 class HeapRegionRemSet; | |
| 50 class HeapRegionRemSetIterator; | |
| 51 class HeapRegion; | |
| 2152 | 52 class HeapRegionSetBase; |
| 12080 | 53 class nmethod; |
| 2152 | 54 |
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55 #define HR_FORMAT "%u:(%s)["PTR_FORMAT","PTR_FORMAT","PTR_FORMAT"]" |
| 3766 | 56 #define HR_FORMAT_PARAMS(_hr_) \ |
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57 (_hr_)->hrm_index(), \ |
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58 (_hr_)->get_short_type_str(), \ |
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59 p2i((_hr_)->bottom()), p2i((_hr_)->top()), p2i((_hr_)->end()) |
| 342 | 60 |
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61 // sentinel value for hrm_index |
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62 #define G1_NO_HRM_INDEX ((uint) -1) |
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63 |
| 342 | 64 // A dirty card to oop closure for heap regions. It |
| 65 // knows how to get the G1 heap and how to use the bitmap | |
| 66 // in the concurrent marker used by G1 to filter remembered | |
| 67 // sets. | |
| 68 | |
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69 class HeapRegionDCTOC : public DirtyCardToOopClosure { |
| 342 | 70 public: |
| 71 // Specification of possible DirtyCardToOopClosure filtering. | |
| 72 enum FilterKind { | |
| 73 NoFilterKind, | |
| 74 IntoCSFilterKind, | |
| 75 OutOfRegionFilterKind | |
| 76 }; | |
| 77 | |
| 78 protected: | |
| 79 HeapRegion* _hr; | |
| 80 FilterKind _fk; | |
| 81 G1CollectedHeap* _g1; | |
| 82 | |
| 83 // Walk the given memory region from bottom to (actual) top | |
| 84 // looking for objects and applying the oop closure (_cl) to | |
| 85 // them. The base implementation of this treats the area as | |
| 86 // blocks, where a block may or may not be an object. Sub- | |
| 87 // classes should override this to provide more accurate | |
| 88 // or possibly more efficient walking. | |
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89 void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top); |
| 342 | 90 |
| 91 public: | |
| 92 HeapRegionDCTOC(G1CollectedHeap* g1, | |
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93 HeapRegion* hr, ExtendedOopClosure* cl, |
| 342 | 94 CardTableModRefBS::PrecisionStyle precision, |
| 95 FilterKind fk); | |
| 96 }; | |
| 97 | |
| 98 // The complicating factor is that BlockOffsetTable diverged | |
| 99 // significantly, and we need functionality that is only in the G1 version. | |
| 100 // So I copied that code, which led to an alternate G1 version of | |
| 101 // OffsetTableContigSpace. If the two versions of BlockOffsetTable could | |
| 102 // be reconciled, then G1OffsetTableContigSpace could go away. | |
| 103 | |
| 104 // The idea behind time stamps is the following. Doing a save_marks on | |
| 105 // all regions at every GC pause is time consuming (if I remember | |
| 106 // well, 10ms or so). So, we would like to do that only for regions | |
| 107 // that are GC alloc regions. To achieve this, we use time | |
| 108 // stamps. For every evacuation pause, G1CollectedHeap generates a | |
| 109 // unique time stamp (essentially a counter that gets | |
| 110 // incremented). Every time we want to call save_marks on a region, | |
| 111 // we set the saved_mark_word to top and also copy the current GC | |
| 112 // time stamp to the time stamp field of the space. Reading the | |
| 113 // saved_mark_word involves checking the time stamp of the | |
| 114 // region. If it is the same as the current GC time stamp, then we | |
| 115 // can safely read the saved_mark_word field, as it is valid. If the | |
| 116 // time stamp of the region is not the same as the current GC time | |
| 117 // stamp, then we instead read top, as the saved_mark_word field is | |
| 118 // invalid. Time stamps (on the regions and also on the | |
| 119 // G1CollectedHeap) are reset at every cleanup (we iterate over | |
| 120 // the regions anyway) and at the end of a Full GC. The current scheme | |
| 121 // that uses sequential unsigned ints will fail only if we have 4b | |
| 122 // evacuation pauses between two cleanups, which is _highly_ unlikely. | |
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123 class G1OffsetTableContigSpace: public CompactibleSpace { |
| 342 | 124 friend class VMStructs; |
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125 HeapWord* _top; |
| 342 | 126 protected: |
| 127 G1BlockOffsetArrayContigSpace _offsets; | |
| 128 Mutex _par_alloc_lock; | |
| 129 volatile unsigned _gc_time_stamp; | |
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130 // When we need to retire an allocation region, while other threads |
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131 // are also concurrently trying to allocate into it, we typically |
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132 // allocate a dummy object at the end of the region to ensure that |
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133 // no more allocations can take place in it. However, sometimes we |
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134 // want to know where the end of the last "real" object we allocated |
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135 // into the region was and this is what this keeps track. |
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136 HeapWord* _pre_dummy_top; |
| 342 | 137 |
| 138 public: | |
| 139 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
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140 MemRegion mr); |
| 342 | 141 |
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142 void set_top(HeapWord* value) { _top = value; } |
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143 HeapWord* top() const { return _top; } |
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144 |
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145 protected: |
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146 // Reset the G1OffsetTableContigSpace. |
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147 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
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148 |
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149 HeapWord** top_addr() { return &_top; } |
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150 // Allocation helpers (return NULL if full). |
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151 inline HeapWord* allocate_impl(size_t word_size, HeapWord* end_value); |
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152 inline HeapWord* par_allocate_impl(size_t word_size, HeapWord* end_value); |
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153 |
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154 public: |
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155 void reset_after_compaction() { set_top(compaction_top()); } |
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156 |
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157 size_t used() const { return byte_size(bottom(), top()); } |
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158 size_t free() const { return byte_size(top(), end()); } |
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159 bool is_free_block(const HeapWord* p) const { return p >= top(); } |
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160 |
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161 MemRegion used_region() const { return MemRegion(bottom(), top()); } |
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162 |
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163 void object_iterate(ObjectClosure* blk); |
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164 void safe_object_iterate(ObjectClosure* blk); |
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165 |
| 342 | 166 void set_bottom(HeapWord* value); |
| 167 void set_end(HeapWord* value); | |
| 168 | |
| 169 virtual HeapWord* saved_mark_word() const; | |
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170 void record_top_and_timestamp(); |
| 342 | 171 void reset_gc_time_stamp() { _gc_time_stamp = 0; } |
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172 unsigned get_gc_time_stamp() { return _gc_time_stamp; } |
| 342 | 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 clear(bool mangle_space); |
| 342 | 186 |
| 187 HeapWord* block_start(const void* p); | |
| 188 HeapWord* block_start_const(const void* p) const; | |
| 189 | |
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190 void prepare_for_compaction(CompactPoint* cp); |
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191 |
| 342 | 192 // Add offset table update. |
| 193 virtual HeapWord* allocate(size_t word_size); | |
| 194 HeapWord* par_allocate(size_t word_size); | |
| 195 | |
| 196 // MarkSweep support phase3 | |
| 197 virtual HeapWord* initialize_threshold(); | |
| 198 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
| 199 | |
| 200 virtual void print() const; | |
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201 |
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202 void reset_bot() { |
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203 _offsets.reset_bot(); |
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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 | |
| 219 // The remembered set for this region. | |
| 220 // (Might want to make this "inline" later, to avoid some alloc failure | |
| 221 // issues.) | |
| 222 HeapRegionRemSet* _rem_set; | |
| 223 | |
| 224 G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } | |
| 225 | |
| 226 protected: | |
| 3766 | 227 // The index of this region in the heap region sequence. |
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228 uint _hrm_index; |
| 342 | 229 |
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230 AllocationContext_t _allocation_context; |
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231 |
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232 HeapRegionType _type; |
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233 |
| 342 | 234 // For a humongous region, region in which it starts. |
| 235 HeapRegion* _humongous_start_region; | |
| 236 // For the start region of a humongous sequence, it's original end(). | |
| 237 HeapWord* _orig_end; | |
| 238 | |
| 239 // True iff the region is in current collection_set. | |
| 240 bool _in_collection_set; | |
| 241 | |
| 242 // True iff an attempt to evacuate an object in the region failed. | |
| 243 bool _evacuation_failed; | |
| 244 | |
| 245 // A heap region may be a member one of a number of special subsets, each | |
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246 // represented as linked lists through the field below. Currently, there |
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247 // is only one set: |
| 342 | 248 // The collection set. |
| 249 HeapRegion* _next_in_special_set; | |
| 250 | |
| 251 // next region in the young "generation" region set | |
| 252 HeapRegion* _next_young_region; | |
| 253 | |
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254 // Next region whose cards need cleaning |
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255 HeapRegion* _next_dirty_cards_region; |
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256 |
| 2152 | 257 // Fields used by the HeapRegionSetBase class and subclasses. |
| 258 HeapRegion* _next; | |
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259 HeapRegion* _prev; |
| 2152 | 260 #ifdef ASSERT |
| 261 HeapRegionSetBase* _containing_set; | |
| 262 #endif // ASSERT | |
| 263 | |
| 342 | 264 // For parallel heapRegion traversal. |
| 265 jint _claimed; | |
| 266 | |
| 267 // We use concurrent marking to determine the amount of live data | |
| 268 // in each heap region. | |
| 269 size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. | |
| 270 size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. | |
| 271 | |
| 6011 | 272 // The calculated GC efficiency of the region. |
| 342 | 273 double _gc_efficiency; |
| 274 | |
| 275 int _young_index_in_cset; | |
| 276 SurvRateGroup* _surv_rate_group; | |
| 277 int _age_index; | |
| 278 | |
| 279 // The start of the unmarked area. The unmarked area extends from this | |
| 280 // word until the top and/or end of the region, and is the part | |
| 281 // of the region for which no marking was done, i.e. objects may | |
| 282 // have been allocated in this part since the last mark phase. | |
| 283 // "prev" is the top at the start of the last completed marking. | |
| 284 // "next" is the top at the start of the in-progress marking (if any.) | |
| 285 HeapWord* _prev_top_at_mark_start; | |
| 286 HeapWord* _next_top_at_mark_start; | |
| 287 // If a collection pause is in progress, this is the top at the start | |
| 288 // of that pause. | |
| 289 | |
| 290 void init_top_at_mark_start() { | |
| 291 assert(_prev_marked_bytes == 0 && | |
| 292 _next_marked_bytes == 0, | |
| 293 "Must be called after zero_marked_bytes."); | |
| 294 HeapWord* bot = bottom(); | |
| 295 _prev_top_at_mark_start = bot; | |
| 296 _next_top_at_mark_start = bot; | |
| 297 } | |
| 298 | |
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299 // Cached attributes used in the collection set policy information |
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300 |
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301 // The RSet length that was added to the total value |
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302 // for the collection set. |
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303 size_t _recorded_rs_length; |
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304 |
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305 // The predicted elapsed time that was added to total value |
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306 // for the collection set. |
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307 double _predicted_elapsed_time_ms; |
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308 |
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309 // The predicted number of bytes to copy that was added to |
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310 // the total value for the collection set. |
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311 size_t _predicted_bytes_to_copy; |
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312 |
| 342 | 313 public: |
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314 HeapRegion(uint hrm_index, |
| 3766 | 315 G1BlockOffsetSharedArray* sharedOffsetArray, |
| 20417 | 316 MemRegion mr); |
| 342 | 317 |
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318 // Initializing the HeapRegion not only resets the data structure, but also |
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319 // resets the BOT for that heap region. |
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320 // The default values for clear_space means that we will do the clearing if |
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321 // there's clearing to be done ourselves. We also always mangle the space. |
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322 virtual void initialize(MemRegion mr, bool clear_space = false, bool mangle_space = SpaceDecorator::Mangle); |
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323 |
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324 static int LogOfHRGrainBytes; |
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325 static int LogOfHRGrainWords; |
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326 |
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327 static size_t GrainBytes; |
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328 static size_t GrainWords; |
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329 static size_t CardsPerRegion; |
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330 |
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331 static size_t align_up_to_region_byte_size(size_t sz) { |
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332 return (sz + (size_t) GrainBytes - 1) & |
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333 ~((1 << (size_t) LogOfHRGrainBytes) - 1); |
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334 } |
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335 |
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336 static size_t max_region_size(); |
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337 |
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338 // It sets up the heap region size (GrainBytes / GrainWords), as |
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339 // well as other related fields that are based on the heap region |
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340 // size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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341 // CardsPerRegion). All those fields are considered constant |
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342 // throughout the JVM's execution, therefore they should only be set |
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343 // up once during initialization time. |
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344 static void setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size); |
| 342 | 345 |
| 355 | 346 enum ClaimValues { |
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347 InitialClaimValue = 0, |
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348 FinalCountClaimValue = 1, |
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349 NoteEndClaimValue = 2, |
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350 ScrubRemSetClaimValue = 3, |
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351 ParVerifyClaimValue = 4, |
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352 RebuildRSClaimValue = 5, |
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353 ParEvacFailureClaimValue = 6, |
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354 AggregateCountClaimValue = 7, |
| 12080 | 355 VerifyCountClaimValue = 8, |
| 356 ParMarkRootClaimValue = 9 | |
| 355 | 357 }; |
| 358 | |
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359 // All allocated blocks are occupied by objects in a HeapRegion |
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360 bool block_is_obj(const HeapWord* p) const; |
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361 |
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362 // Returns the object size for all valid block starts |
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363 // and the amount of unallocated words if called on top() |
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364 size_t block_size(const HeapWord* p) const; |
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365 |
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366 inline HeapWord* par_allocate_no_bot_updates(size_t word_size); |
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367 inline HeapWord* allocate_no_bot_updates(size_t word_size); |
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368 |
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369 // If this region is a member of a HeapRegionManager, the index in that |
| 342 | 370 // sequence, otherwise -1. |
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371 uint hrm_index() const { return _hrm_index; } |
| 342 | 372 |
| 373 // The number of bytes marked live in the region in the last marking phase. | |
| 374 size_t marked_bytes() { return _prev_marked_bytes; } | |
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375 size_t live_bytes() { |
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376 return (top() - prev_top_at_mark_start()) * HeapWordSize + marked_bytes(); |
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377 } |
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378 |
| 342 | 379 // The number of bytes counted in the next marking. |
| 380 size_t next_marked_bytes() { return _next_marked_bytes; } | |
| 381 // The number of bytes live wrt the next marking. | |
| 382 size_t next_live_bytes() { | |
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383 return |
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384 (top() - next_top_at_mark_start()) * HeapWordSize + next_marked_bytes(); |
| 342 | 385 } |
| 386 | |
| 387 // A lower bound on the amount of garbage bytes in the region. | |
| 388 size_t garbage_bytes() { | |
| 389 size_t used_at_mark_start_bytes = | |
| 390 (prev_top_at_mark_start() - bottom()) * HeapWordSize; | |
| 391 assert(used_at_mark_start_bytes >= marked_bytes(), | |
| 392 "Can't mark more than we have."); | |
| 393 return used_at_mark_start_bytes - marked_bytes(); | |
| 394 } | |
| 395 | |
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396 // Return the amount of bytes we'll reclaim if we collect this |
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397 // region. This includes not only the known garbage bytes in the |
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398 // region but also any unallocated space in it, i.e., [top, end), |
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399 // since it will also be reclaimed if we collect the region. |
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400 size_t reclaimable_bytes() { |
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401 size_t known_live_bytes = live_bytes(); |
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402 assert(known_live_bytes <= capacity(), "sanity"); |
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403 return capacity() - known_live_bytes; |
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404 } |
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405 |
| 342 | 406 // An upper bound on the number of live bytes in the region. |
| 407 size_t max_live_bytes() { return used() - garbage_bytes(); } | |
| 408 | |
| 409 void add_to_marked_bytes(size_t incr_bytes) { | |
| 410 _next_marked_bytes = _next_marked_bytes + incr_bytes; | |
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411 assert(_next_marked_bytes <= used(), "invariant" ); |
| 342 | 412 } |
| 413 | |
| 414 void zero_marked_bytes() { | |
| 415 _prev_marked_bytes = _next_marked_bytes = 0; | |
| 416 } | |
| 417 | |
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418 const char* get_type_str() const { return _type.get_str(); } |
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419 const char* get_short_type_str() const { return _type.get_short_str(); } |
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420 |
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421 bool is_free() const { return _type.is_free(); } |
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422 |
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423 bool is_young() const { return _type.is_young(); } |
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424 bool is_eden() const { return _type.is_eden(); } |
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425 bool is_survivor() const { return _type.is_survivor(); } |
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426 |
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427 bool isHumongous() const { return _type.is_humongous(); } |
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428 bool startsHumongous() const { return _type.is_starts_humongous(); } |
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429 bool continuesHumongous() const { return _type.is_continues_humongous(); } |
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430 |
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431 bool is_old() const { return _type.is_old(); } |
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432 |
| 342 | 433 // For a humongous region, region in which it starts. |
| 434 HeapRegion* humongous_start_region() const { | |
| 435 return _humongous_start_region; | |
| 436 } | |
| 437 | |
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438 // Return the number of distinct regions that are covered by this region: |
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439 // 1 if the region is not humongous, >= 1 if the region is humongous. |
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440 uint region_num() const { |
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441 if (!isHumongous()) { |
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442 return 1U; |
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443 } else { |
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444 assert(startsHumongous(), "doesn't make sense on HC regions"); |
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445 assert(capacity() % HeapRegion::GrainBytes == 0, "sanity"); |
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446 return (uint) (capacity() >> HeapRegion::LogOfHRGrainBytes); |
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447 } |
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448 } |
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449 |
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450 // Return the index + 1 of the last HC regions that's associated |
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451 // with this HS region. |
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452 uint last_hc_index() const { |
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453 assert(startsHumongous(), "don't call this otherwise"); |
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454 return hrm_index() + region_num(); |
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455 } |
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456 |
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457 // Same as Space::is_in_reserved, but will use the original size of the region. |
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458 // The original size is different only for start humongous regions. They get |
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459 // their _end set up to be the end of the last continues region of the |
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460 // corresponding humongous object. |
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461 bool is_in_reserved_raw(const void* p) const { |
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462 return _bottom <= p && p < _orig_end; |
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463 } |
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464 |
|
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465 // Makes the current region be a "starts humongous" region, i.e., |
|
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466 // the first region in a series of one or more contiguous regions |
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467 // that will contain a single "humongous" object. The two parameters |
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468 // are as follows: |
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469 // |
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470 // new_top : The new value of the top field of this region which |
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471 // points to the end of the humongous object that's being |
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472 // allocated. If there is more than one region in the series, top |
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473 // will lie beyond this region's original end field and on the last |
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474 // region in the series. |
|
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475 // |
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476 // new_end : The new value of the end field of this region which |
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477 // points to the end of the last region in the series. If there is |
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478 // one region in the series (namely: this one) end will be the same |
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479 // as the original end of this region. |
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480 // |
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481 // Updating top and end as described above makes this region look as |
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482 // if it spans the entire space taken up by all the regions in the |
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483 // series and an single allocation moved its top to new_top. This |
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484 // ensures that the space (capacity / allocated) taken up by all |
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485 // humongous regions can be calculated by just looking at the |
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486 // "starts humongous" regions and by ignoring the "continues |
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487 // humongous" regions. |
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488 void set_startsHumongous(HeapWord* new_top, HeapWord* new_end); |
| 342 | 489 |
|
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490 // Makes the current region be a "continues humongous' |
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491 // region. first_hr is the "start humongous" region of the series |
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492 // which this region will be part of. |
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493 void set_continuesHumongous(HeapRegion* first_hr); |
| 342 | 494 |
| 2152 | 495 // Unsets the humongous-related fields on the region. |
|
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496 void clear_humongous(); |
| 2152 | 497 |
| 342 | 498 // If the region has a remembered set, return a pointer to it. |
| 499 HeapRegionRemSet* rem_set() const { | |
| 500 return _rem_set; | |
| 501 } | |
| 502 | |
| 503 // True iff the region is in current collection_set. | |
| 504 bool in_collection_set() const { | |
| 505 return _in_collection_set; | |
| 506 } | |
| 507 void set_in_collection_set(bool b) { | |
| 508 _in_collection_set = b; | |
| 509 } | |
| 510 HeapRegion* next_in_collection_set() { | |
| 511 assert(in_collection_set(), "should only invoke on member of CS."); | |
| 512 assert(_next_in_special_set == NULL || | |
| 513 _next_in_special_set->in_collection_set(), | |
| 514 "Malformed CS."); | |
| 515 return _next_in_special_set; | |
| 516 } | |
| 517 void set_next_in_collection_set(HeapRegion* r) { | |
| 518 assert(in_collection_set(), "should only invoke on member of CS."); | |
| 519 assert(r == NULL || r->in_collection_set(), "Malformed CS."); | |
| 520 _next_in_special_set = r; | |
| 521 } | |
| 522 | |
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523 void set_allocation_context(AllocationContext_t context) { |
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524 _allocation_context = context; |
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525 } |
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526 |
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527 AllocationContext_t allocation_context() const { |
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528 return _allocation_context; |
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529 } |
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530 |
| 2152 | 531 // Methods used by the HeapRegionSetBase class and subclasses. |
| 342 | 532 |
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533 // Getter and setter for the next and prev fields used to link regions into |
| 2152 | 534 // linked lists. |
| 535 HeapRegion* next() { return _next; } | |
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536 HeapRegion* prev() { return _prev; } |
| 2152 | 537 |
| 538 void set_next(HeapRegion* next) { _next = next; } | |
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539 void set_prev(HeapRegion* prev) { _prev = prev; } |
| 342 | 540 |
| 2152 | 541 // Every region added to a set is tagged with a reference to that |
| 542 // set. This is used for doing consistency checking to make sure that | |
| 543 // the contents of a set are as they should be and it's only | |
| 544 // available in non-product builds. | |
| 545 #ifdef ASSERT | |
| 546 void set_containing_set(HeapRegionSetBase* containing_set) { | |
| 547 assert((containing_set == NULL && _containing_set != NULL) || | |
| 548 (containing_set != NULL && _containing_set == NULL), | |
| 549 err_msg("containing_set: "PTR_FORMAT" " | |
| 550 "_containing_set: "PTR_FORMAT, | |
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551 p2i(containing_set), p2i(_containing_set))); |
| 2152 | 552 |
| 553 _containing_set = containing_set; | |
| 2361 | 554 } |
| 342 | 555 |
| 2152 | 556 HeapRegionSetBase* containing_set() { return _containing_set; } |
| 557 #else // ASSERT | |
| 558 void set_containing_set(HeapRegionSetBase* containing_set) { } | |
| 342 | 559 |
| 2361 | 560 // containing_set() is only used in asserts so there's no reason |
| 2152 | 561 // to provide a dummy version of it. |
| 562 #endif // ASSERT | |
| 342 | 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 |
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574 HeapWord* orig_end() const { return _orig_end; } |
| 3766 | 575 |
| 342 | 576 // Reset HR stuff to default values. |
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577 void hr_clear(bool par, bool clear_space, bool locked = false); |
|
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578 void par_clear(); |
| 342 | 579 |
| 580 // Get the start of the unmarked area in this region. | |
| 581 HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } | |
| 582 HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } | |
| 583 | |
| 584 // Note the start or end of marking. This tells the heap region | |
| 585 // that the collector is about to start or has finished (concurrently) | |
| 586 // marking the heap. | |
| 587 | |
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588 // Notify the region that concurrent marking is starting. Initialize |
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589 // all fields related to the next marking info. |
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590 inline void note_start_of_marking(); |
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591 |
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592 // Notify the region that concurrent marking has finished. Copy the |
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593 // (now finalized) next marking info fields into the prev marking |
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594 // info fields. |
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595 inline void note_end_of_marking(); |
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596 |
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597 // Notify the region that it will be used as to-space during a GC |
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598 // and we are about to start copying objects into it. |
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599 inline void note_start_of_copying(bool during_initial_mark); |
| 342 | 600 |
|
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601 // Notify the region that it ceases being to-space during a GC and |
|
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602 // we will not copy objects into it any more. |
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603 inline void note_end_of_copying(bool during_initial_mark); |
| 342 | 604 |
|
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605 // Notify the region that we are about to start processing |
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606 // self-forwarded objects during evac failure handling. |
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607 void note_self_forwarding_removal_start(bool during_initial_mark, |
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608 bool during_conc_mark); |
| 342 | 609 |
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610 // Notify the region that we have finished processing self-forwarded |
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611 // objects during evac failure handling. |
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612 void note_self_forwarding_removal_end(bool during_initial_mark, |
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613 bool during_conc_mark, |
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614 size_t marked_bytes); |
| 342 | 615 |
| 616 // Returns "false" iff no object in the region was allocated when the | |
| 617 // last mark phase ended. | |
| 618 bool is_marked() { return _prev_top_at_mark_start != bottom(); } | |
| 619 | |
| 620 void reset_during_compaction() { | |
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621 assert(isHumongous() && startsHumongous(), |
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622 "should only be called for starts humongous regions"); |
| 342 | 623 |
| 624 zero_marked_bytes(); | |
| 625 init_top_at_mark_start(); | |
| 626 } | |
| 627 | |
| 628 void calc_gc_efficiency(void); | |
| 629 double gc_efficiency() { return _gc_efficiency;} | |
| 630 | |
| 631 int young_index_in_cset() const { return _young_index_in_cset; } | |
| 632 void set_young_index_in_cset(int index) { | |
| 633 assert( (index == -1) || is_young(), "pre-condition" ); | |
| 634 _young_index_in_cset = index; | |
| 635 } | |
| 636 | |
| 637 int age_in_surv_rate_group() { | |
| 638 assert( _surv_rate_group != NULL, "pre-condition" ); | |
| 639 assert( _age_index > -1, "pre-condition" ); | |
| 640 return _surv_rate_group->age_in_group(_age_index); | |
| 641 } | |
| 642 | |
| 643 void record_surv_words_in_group(size_t words_survived) { | |
| 644 assert( _surv_rate_group != NULL, "pre-condition" ); | |
| 645 assert( _age_index > -1, "pre-condition" ); | |
| 646 int age_in_group = age_in_surv_rate_group(); | |
| 647 _surv_rate_group->record_surviving_words(age_in_group, words_survived); | |
| 648 } | |
| 649 | |
| 650 int age_in_surv_rate_group_cond() { | |
| 651 if (_surv_rate_group != NULL) | |
| 652 return age_in_surv_rate_group(); | |
| 653 else | |
| 654 return -1; | |
| 655 } | |
| 656 | |
| 657 SurvRateGroup* surv_rate_group() { | |
| 658 return _surv_rate_group; | |
| 659 } | |
| 660 | |
| 661 void install_surv_rate_group(SurvRateGroup* surv_rate_group) { | |
| 662 assert( surv_rate_group != NULL, "pre-condition" ); | |
| 663 assert( _surv_rate_group == NULL, "pre-condition" ); | |
| 664 assert( is_young(), "pre-condition" ); | |
| 665 | |
| 666 _surv_rate_group = surv_rate_group; | |
| 667 _age_index = surv_rate_group->next_age_index(); | |
| 668 } | |
| 669 | |
| 670 void uninstall_surv_rate_group() { | |
| 671 if (_surv_rate_group != NULL) { | |
| 672 assert( _age_index > -1, "pre-condition" ); | |
| 673 assert( is_young(), "pre-condition" ); | |
| 674 | |
| 675 _surv_rate_group = NULL; | |
| 676 _age_index = -1; | |
| 677 } else { | |
| 678 assert( _age_index == -1, "pre-condition" ); | |
| 679 } | |
| 680 } | |
| 681 | |
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682 void set_free() { _type.set_free(); } |
| 342 | 683 |
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684 void set_eden() { _type.set_eden(); } |
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685 void set_eden_pre_gc() { _type.set_eden_pre_gc(); } |
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686 void set_survivor() { _type.set_survivor(); } |
| 342 | 687 |
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688 void set_old() { _type.set_old(); } |
| 342 | 689 |
| 690 // Determine if an object has been allocated since the last | |
| 691 // mark performed by the collector. This returns true iff the object | |
| 692 // is within the unmarked area of the region. | |
| 693 bool obj_allocated_since_prev_marking(oop obj) const { | |
| 694 return (HeapWord *) obj >= prev_top_at_mark_start(); | |
| 695 } | |
| 696 bool obj_allocated_since_next_marking(oop obj) const { | |
| 697 return (HeapWord *) obj >= next_top_at_mark_start(); | |
| 698 } | |
| 699 | |
| 700 // For parallel heapRegion traversal. | |
| 701 bool claimHeapRegion(int claimValue); | |
| 702 jint claim_value() { return _claimed; } | |
| 703 // Use this carefully: only when you're sure no one is claiming... | |
| 704 void set_claim_value(int claimValue) { _claimed = claimValue; } | |
| 705 | |
| 706 // Returns the "evacuation_failed" property of the region. | |
| 707 bool evacuation_failed() { return _evacuation_failed; } | |
| 708 | |
| 709 // Sets the "evacuation_failed" property of the region. | |
| 710 void set_evacuation_failed(bool b) { | |
| 711 _evacuation_failed = b; | |
| 712 | |
| 713 if (b) { | |
| 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 // filter_young: if true and the region is a young region then we |
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730 // skip the iteration. |
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731 // card_ptr: if not NULL, and we decide that the card is not young |
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732 // and we iterate over it, we'll clean the card before we start the |
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733 // iteration. |
| 342 | 734 HeapWord* |
| 735 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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736 FilterOutOfRegionClosure* cl, |
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737 bool filter_young, |
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738 jbyte* card_ptr); |
| 342 | 739 |
| 740 // A version of block start that is guaranteed to find *some* block | |
| 741 // boundary at or before "p", but does not object iteration, and may | |
| 742 // therefore be used safely when the heap is unparseable. | |
| 743 HeapWord* block_start_careful(const void* p) const { | |
| 744 return _offsets.block_start_careful(p); | |
| 745 } | |
| 746 | |
| 747 // Requires that "addr" is within the region. Returns the start of the | |
| 748 // first ("careful") block that starts at or after "addr", or else the | |
| 749 // "end" of the region if there is no such block. | |
| 750 HeapWord* next_block_start_careful(HeapWord* addr); | |
| 751 | |
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752 size_t recorded_rs_length() const { return _recorded_rs_length; } |
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753 double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; } |
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754 size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; } |
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755 |
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756 void set_recorded_rs_length(size_t rs_length) { |
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757 _recorded_rs_length = rs_length; |
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758 } |
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759 |
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760 void set_predicted_elapsed_time_ms(double ms) { |
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761 _predicted_elapsed_time_ms = ms; |
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762 } |
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763 |
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764 void set_predicted_bytes_to_copy(size_t bytes) { |
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765 _predicted_bytes_to_copy = bytes; |
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766 } |
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767 |
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768 virtual CompactibleSpace* next_compaction_space() const; |
| 342 | 769 |
| 770 virtual void reset_after_compaction(); | |
| 771 | |
| 12080 | 772 // Routines for managing a list of code roots (attached to the |
| 773 // this region's RSet) that point into this heap region. | |
| 774 void add_strong_code_root(nmethod* nm); | |
| 775 void remove_strong_code_root(nmethod* nm); | |
| 776 | |
| 777 // During a collection, migrate the successfully evacuated | |
| 778 // strong code roots that referenced into this region to the | |
| 779 // new regions that they now point into. Unsuccessfully | |
| 780 // evacuated code roots are not migrated. | |
| 781 void migrate_strong_code_roots(); | |
| 782 | |
| 783 // Applies blk->do_code_blob() to each of the entries in | |
| 784 // the strong code roots list for this region | |
| 785 void strong_code_roots_do(CodeBlobClosure* blk) const; | |
| 786 | |
| 787 // Verify that the entries on the strong code root list for this | |
| 788 // region are live and include at least one pointer into this region. | |
| 789 void verify_strong_code_roots(VerifyOption vo, bool* failures) const; | |
| 790 | |
| 342 | 791 void print() const; |
| 792 void print_on(outputStream* st) const; | |
| 793 | |
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794 // vo == UsePrevMarking -> use "prev" marking information, |
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795 // vo == UseNextMarking -> use "next" marking information |
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796 // vo == UseMarkWord -> use the mark word in the object header |
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797 // |
| 811 | 798 // NOTE: Only the "prev" marking information is guaranteed to be |
| 799 // consistent most of the time, so most calls to this should use | |
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800 // vo == UsePrevMarking. |
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801 // Currently, there is only one case where this is called with |
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802 // vo == UseNextMarking, which is to verify the "next" marking |
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803 // information at the end of remark. |
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804 // Currently there is only one place where this is called with |
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805 // vo == UseMarkWord, which is to verify the marking during a |
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806 // full GC. |
| 6008 | 807 void verify(VerifyOption vo, bool *failures) const; |
| 811 | 808 |
| 809 // Override; it uses the "prev" marking information | |
| 6008 | 810 virtual void verify() const; |
| 342 | 811 }; |
| 812 | |
| 813 // HeapRegionClosure is used for iterating over regions. | |
| 814 // Terminates the iteration when the "doHeapRegion" method returns "true". | |
| 815 class HeapRegionClosure : public StackObj { | |
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816 friend class HeapRegionManager; |
| 342 | 817 friend class G1CollectedHeap; |
| 818 | |
| 819 bool _complete; | |
| 820 void incomplete() { _complete = false; } | |
| 821 | |
| 822 public: | |
| 823 HeapRegionClosure(): _complete(true) {} | |
| 824 | |
| 825 // Typically called on each region until it returns true. | |
| 826 virtual bool doHeapRegion(HeapRegion* r) = 0; | |
| 827 | |
| 828 // True after iteration if the closure was applied to all heap regions | |
| 829 // and returned "false" in all cases. | |
| 830 bool complete() { return _complete; } | |
| 831 }; | |
| 832 | |
| 1972 | 833 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |