Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegion.hpp @ 20276:1526a938e670
8047818: G1 HeapRegions can no longer be ContiguousSpaces
Summary: Change parent of G1OffsetTableContigSpace to CompactibleSpace, reimplement missing functionality
Reviewed-by: stefank, jmasa, tschatzl
author | mgerdin |
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date | Thu, 26 Jun 2014 11:36:58 +0200 |
parents | a8137787acfe |
children | 2c6ef90f030a |
rev | line source |
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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/g1BlockOffsetTable.hpp" |
1972 | 29 #include "gc_implementation/g1/g1_specialized_oop_closures.hpp" |
30 #include "gc_implementation/g1/survRateGroup.hpp" | |
31 #include "gc_implementation/shared/ageTable.hpp" | |
32 #include "gc_implementation/shared/spaceDecorator.hpp" | |
33 #include "memory/space.inline.hpp" | |
34 #include "memory/watermark.hpp" | |
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35 #include "utilities/macros.hpp" |
1972 | 36 |
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37 #if INCLUDE_ALL_GCS |
342 | 38 |
39 // A HeapRegion is the smallest piece of a G1CollectedHeap that | |
40 // can be collected independently. | |
41 | |
42 // NOTE: Although a HeapRegion is a Space, its | |
43 // Space::initDirtyCardClosure method must not be called. | |
44 // The problem is that the existence of this method breaks | |
45 // the independence of barrier sets from remembered sets. | |
46 // The solution is to remove this method from the definition | |
47 // of a Space. | |
48 | |
49 class 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_) \ |
57 (_hr_)->hrs_index(), \ | |
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58 (_hr_)->is_survivor() ? "S" : (_hr_)->is_young() ? "E" : \ |
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59 (_hr_)->startsHumongous() ? "HS" : \ |
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60 (_hr_)->continuesHumongous() ? "HC" : \ |
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61 !(_hr_)->is_empty() ? "O" : "F", \ |
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62 p2i((_hr_)->bottom()), p2i((_hr_)->top()), p2i((_hr_)->end()) |
342 | 63 |
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64 // sentinel value for hrs_index |
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65 #define G1_NULL_HRS_INDEX ((uint) -1) |
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66 |
342 | 67 // A dirty card to oop closure for heap regions. It |
68 // knows how to get the G1 heap and how to use the bitmap | |
69 // in the concurrent marker used by G1 to filter remembered | |
70 // sets. | |
71 | |
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72 class HeapRegionDCTOC : public DirtyCardToOopClosure { |
342 | 73 public: |
74 // Specification of possible DirtyCardToOopClosure filtering. | |
75 enum FilterKind { | |
76 NoFilterKind, | |
77 IntoCSFilterKind, | |
78 OutOfRegionFilterKind | |
79 }; | |
80 | |
81 protected: | |
82 HeapRegion* _hr; | |
83 FilterKind _fk; | |
84 G1CollectedHeap* _g1; | |
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. | |
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92 void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top); |
342 | 93 |
94 public: | |
95 HeapRegionDCTOC(G1CollectedHeap* g1, | |
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96 HeapRegion* hr, ExtendedOopClosure* cl, |
342 | 97 CardTableModRefBS::PrecisionStyle precision, |
98 FilterKind fk); | |
99 }; | |
100 | |
101 // The complicating factor is that BlockOffsetTable diverged | |
102 // significantly, and we need functionality that is only in the G1 version. | |
103 // So I copied that code, which led to an alternate G1 version of | |
104 // OffsetTableContigSpace. If the two versions of BlockOffsetTable could | |
105 // be reconciled, then G1OffsetTableContigSpace could go away. | |
106 | |
107 // The idea behind time stamps is the following. Doing a save_marks on | |
108 // all regions at every GC pause is time consuming (if I remember | |
109 // well, 10ms or so). So, we would like to do that only for regions | |
110 // that are GC alloc regions. To achieve this, we use time | |
111 // stamps. For every evacuation pause, G1CollectedHeap generates a | |
112 // unique time stamp (essentially a counter that gets | |
113 // incremented). Every time we want to call save_marks on a region, | |
114 // we set the saved_mark_word to top and also copy the current GC | |
115 // time stamp to the time stamp field of the space. Reading the | |
116 // saved_mark_word involves checking the time stamp of the | |
117 // region. If it is the same as the current GC time stamp, then we | |
118 // can safely read the saved_mark_word field, as it is valid. If the | |
119 // time stamp of the region is not the same as the current GC time | |
120 // stamp, then we instead read top, as the saved_mark_word field is | |
121 // invalid. Time stamps (on the regions and also on the | |
122 // G1CollectedHeap) are reset at every cleanup (we iterate over | |
123 // the regions anyway) and at the end of a Full GC. The current scheme | |
124 // that uses sequential unsigned ints will fail only if we have 4b | |
125 // evacuation pauses between two cleanups, which is _highly_ unlikely. | |
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126 class G1OffsetTableContigSpace: public CompactibleSpace { |
342 | 127 friend class VMStructs; |
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128 HeapWord* _top; |
342 | 129 protected: |
130 G1BlockOffsetArrayContigSpace _offsets; | |
131 Mutex _par_alloc_lock; | |
132 volatile unsigned _gc_time_stamp; | |
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133 // When we need to retire an allocation region, while other threads |
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134 // are also concurrently trying to allocate into it, we typically |
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135 // allocate a dummy object at the end of the region to ensure that |
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136 // no more allocations can take place in it. However, sometimes we |
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137 // want to know where the end of the last "real" object we allocated |
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138 // into the region was and this is what this keeps track. |
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139 HeapWord* _pre_dummy_top; |
342 | 140 |
141 public: | |
142 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
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143 MemRegion mr); |
342 | 144 |
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145 void set_top(HeapWord* value) { _top = value; } |
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146 HeapWord* top() const { return _top; } |
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147 |
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148 protected: |
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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.zero_bottom_entry(); |
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204 _offsets.initialize_threshold(); |
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205 } |
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206 |
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207 void update_bot_for_object(HeapWord* start, size_t word_size) { |
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208 _offsets.alloc_block(start, word_size); |
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209 } |
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210 |
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211 void print_bot_on(outputStream* out) { |
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212 _offsets.print_on(out); |
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213 } |
342 | 214 }; |
215 | |
216 class HeapRegion: public G1OffsetTableContigSpace { | |
217 friend class VMStructs; | |
218 private: | |
219 | |
355 | 220 enum HumongousType { |
221 NotHumongous = 0, | |
222 StartsHumongous, | |
223 ContinuesHumongous | |
224 }; | |
225 | |
342 | 226 // The remembered set for this region. |
227 // (Might want to make this "inline" later, to avoid some alloc failure | |
228 // issues.) | |
229 HeapRegionRemSet* _rem_set; | |
230 | |
231 G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } | |
232 | |
233 protected: | |
3766 | 234 // The index of this region in the heap region sequence. |
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235 uint _hrs_index; |
342 | 236 |
355 | 237 HumongousType _humongous_type; |
342 | 238 // For a humongous region, region in which it starts. |
239 HeapRegion* _humongous_start_region; | |
240 // For the start region of a humongous sequence, it's original end(). | |
241 HeapWord* _orig_end; | |
242 | |
243 // True iff the region is in current collection_set. | |
244 bool _in_collection_set; | |
245 | |
246 // True iff an attempt to evacuate an object in the region failed. | |
247 bool _evacuation_failed; | |
248 | |
249 // A heap region may be a member one of a number of special subsets, each | |
250 // represented as linked lists through the field below. Currently, these | |
251 // sets include: | |
252 // The collection set. | |
253 // The set of allocation regions used in a collection pause. | |
254 // Spaces that may contain gray objects. | |
255 HeapRegion* _next_in_special_set; | |
256 | |
257 // next region in the young "generation" region set | |
258 HeapRegion* _next_young_region; | |
259 | |
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260 // Next region whose cards need cleaning |
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261 HeapRegion* _next_dirty_cards_region; |
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262 |
2152 | 263 // Fields used by the HeapRegionSetBase class and subclasses. |
264 HeapRegion* _next; | |
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265 HeapRegion* _prev; |
2152 | 266 #ifdef ASSERT |
267 HeapRegionSetBase* _containing_set; | |
268 #endif // ASSERT | |
269 bool _pending_removal; | |
270 | |
342 | 271 // For parallel heapRegion traversal. |
272 jint _claimed; | |
273 | |
274 // We use concurrent marking to determine the amount of live data | |
275 // in each heap region. | |
276 size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. | |
277 size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. | |
278 | |
6011 | 279 // The calculated GC efficiency of the region. |
342 | 280 double _gc_efficiency; |
281 | |
282 enum YoungType { | |
283 NotYoung, // a region is not young | |
284 Young, // a region is young | |
3766 | 285 Survivor // a region is young and it contains survivors |
342 | 286 }; |
287 | |
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288 volatile YoungType _young_type; |
342 | 289 int _young_index_in_cset; |
290 SurvRateGroup* _surv_rate_group; | |
291 int _age_index; | |
292 | |
293 // The start of the unmarked area. The unmarked area extends from this | |
294 // word until the top and/or end of the region, and is the part | |
295 // of the region for which no marking was done, i.e. objects may | |
296 // have been allocated in this part since the last mark phase. | |
297 // "prev" is the top at the start of the last completed marking. | |
298 // "next" is the top at the start of the in-progress marking (if any.) | |
299 HeapWord* _prev_top_at_mark_start; | |
300 HeapWord* _next_top_at_mark_start; | |
301 // If a collection pause is in progress, this is the top at the start | |
302 // of that pause. | |
303 | |
304 void init_top_at_mark_start() { | |
305 assert(_prev_marked_bytes == 0 && | |
306 _next_marked_bytes == 0, | |
307 "Must be called after zero_marked_bytes."); | |
308 HeapWord* bot = bottom(); | |
309 _prev_top_at_mark_start = bot; | |
310 _next_top_at_mark_start = bot; | |
311 } | |
312 | |
313 void set_young_type(YoungType new_type) { | |
314 //assert(_young_type != new_type, "setting the same type" ); | |
315 // TODO: add more assertions here | |
316 _young_type = new_type; | |
317 } | |
318 | |
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319 // Cached attributes used in the collection set policy information |
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320 |
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321 // The RSet length that was added to the total value |
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322 // for the collection set. |
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323 size_t _recorded_rs_length; |
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324 |
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325 // The predicted elapsed time that was added to total value |
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326 // for the collection set. |
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327 double _predicted_elapsed_time_ms; |
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328 |
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329 // The predicted number of bytes to copy that was added to |
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330 // the total value for the collection set. |
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331 size_t _predicted_bytes_to_copy; |
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332 |
342 | 333 public: |
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334 HeapRegion(uint hrs_index, |
3766 | 335 G1BlockOffsetSharedArray* sharedOffsetArray, |
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336 MemRegion mr); |
342 | 337 |
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338 static int LogOfHRGrainBytes; |
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339 static int LogOfHRGrainWords; |
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340 |
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341 static size_t GrainBytes; |
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342 static size_t GrainWords; |
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343 static size_t CardsPerRegion; |
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344 |
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345 static size_t align_up_to_region_byte_size(size_t sz) { |
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346 return (sz + (size_t) GrainBytes - 1) & |
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347 ~((1 << (size_t) LogOfHRGrainBytes) - 1); |
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348 } |
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349 |
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350 static size_t max_region_size(); |
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351 |
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352 // It sets up the heap region size (GrainBytes / GrainWords), as |
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353 // well as other related fields that are based on the heap region |
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354 // size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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355 // CardsPerRegion). All those fields are considered constant |
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356 // throughout the JVM's execution, therefore they should only be set |
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357 // up once during initialization time. |
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358 static void setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size); |
342 | 359 |
355 | 360 enum ClaimValues { |
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361 InitialClaimValue = 0, |
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362 FinalCountClaimValue = 1, |
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363 NoteEndClaimValue = 2, |
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364 ScrubRemSetClaimValue = 3, |
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365 ParVerifyClaimValue = 4, |
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366 RebuildRSClaimValue = 5, |
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367 ParEvacFailureClaimValue = 6, |
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368 AggregateCountClaimValue = 7, |
12080 | 369 VerifyCountClaimValue = 8, |
370 ParMarkRootClaimValue = 9 | |
355 | 371 }; |
372 | |
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373 // All allocated blocks are occupied by objects in a HeapRegion |
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374 bool block_is_obj(const HeapWord* p) const; |
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375 |
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376 // Returns the object size for all valid block starts |
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377 // and the amount of unallocated words if called on top() |
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378 size_t block_size(const HeapWord* p) const; |
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379 |
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380 inline HeapWord* par_allocate_no_bot_updates(size_t word_size); |
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381 inline HeapWord* allocate_no_bot_updates(size_t word_size); |
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382 |
342 | 383 // If this region is a member of a HeapRegionSeq, the index in that |
384 // sequence, otherwise -1. | |
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385 uint hrs_index() const { return _hrs_index; } |
342 | 386 |
387 // The number of bytes marked live in the region in the last marking phase. | |
388 size_t marked_bytes() { return _prev_marked_bytes; } | |
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389 size_t live_bytes() { |
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390 return (top() - prev_top_at_mark_start()) * HeapWordSize + marked_bytes(); |
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391 } |
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392 |
342 | 393 // The number of bytes counted in the next marking. |
394 size_t next_marked_bytes() { return _next_marked_bytes; } | |
395 // The number of bytes live wrt the next marking. | |
396 size_t next_live_bytes() { | |
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397 return |
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398 (top() - next_top_at_mark_start()) * HeapWordSize + next_marked_bytes(); |
342 | 399 } |
400 | |
401 // A lower bound on the amount of garbage bytes in the region. | |
402 size_t garbage_bytes() { | |
403 size_t used_at_mark_start_bytes = | |
404 (prev_top_at_mark_start() - bottom()) * HeapWordSize; | |
405 assert(used_at_mark_start_bytes >= marked_bytes(), | |
406 "Can't mark more than we have."); | |
407 return used_at_mark_start_bytes - marked_bytes(); | |
408 } | |
409 | |
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410 // Return the amount of bytes we'll reclaim if we collect this |
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411 // region. This includes not only the known garbage bytes in the |
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412 // region but also any unallocated space in it, i.e., [top, end), |
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413 // since it will also be reclaimed if we collect the region. |
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414 size_t reclaimable_bytes() { |
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415 size_t known_live_bytes = live_bytes(); |
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416 assert(known_live_bytes <= capacity(), "sanity"); |
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417 return capacity() - known_live_bytes; |
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418 } |
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419 |
342 | 420 // An upper bound on the number of live bytes in the region. |
421 size_t max_live_bytes() { return used() - garbage_bytes(); } | |
422 | |
423 void add_to_marked_bytes(size_t incr_bytes) { | |
424 _next_marked_bytes = _next_marked_bytes + incr_bytes; | |
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425 assert(_next_marked_bytes <= used(), "invariant" ); |
342 | 426 } |
427 | |
428 void zero_marked_bytes() { | |
429 _prev_marked_bytes = _next_marked_bytes = 0; | |
430 } | |
431 | |
355 | 432 bool isHumongous() const { return _humongous_type != NotHumongous; } |
433 bool startsHumongous() const { return _humongous_type == StartsHumongous; } | |
434 bool continuesHumongous() const { return _humongous_type == ContinuesHumongous; } | |
342 | 435 // For a humongous region, region in which it starts. |
436 HeapRegion* humongous_start_region() const { | |
437 return _humongous_start_region; | |
438 } | |
439 | |
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440 // Return the number of distinct regions that are covered by this region: |
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441 // 1 if the region is not humongous, >= 1 if the region is humongous. |
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442 uint region_num() const { |
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443 if (!isHumongous()) { |
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444 return 1U; |
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445 } else { |
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446 assert(startsHumongous(), "doesn't make sense on HC regions"); |
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447 assert(capacity() % HeapRegion::GrainBytes == 0, "sanity"); |
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448 return (uint) (capacity() >> HeapRegion::LogOfHRGrainBytes); |
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449 } |
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450 } |
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451 |
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452 // Return the index + 1 of the last HC regions that's associated |
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453 // with this HS region. |
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454 uint last_hc_index() const { |
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455 assert(startsHumongous(), "don't call this otherwise"); |
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456 return hrs_index() + region_num(); |
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457 } |
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458 |
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459 // Same as Space::is_in_reserved, but will use the original size of the region. |
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460 // The original size is different only for start humongous regions. They get |
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461 // their _end set up to be the end of the last continues region of the |
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462 // corresponding humongous object. |
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463 bool is_in_reserved_raw(const void* p) const { |
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464 return _bottom <= p && p < _orig_end; |
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465 } |
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466 |
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467 // Makes the current region be a "starts humongous" region, i.e., |
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468 // the first region in a series of one or more contiguous regions |
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469 // that will contain a single "humongous" object. The two parameters |
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470 // are as follows: |
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471 // |
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472 // new_top : The new value of the top field of this region which |
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473 // points to the end of the humongous object that's being |
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474 // allocated. If there is more than one region in the series, top |
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475 // will lie beyond this region's original end field and on the last |
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476 // region in the series. |
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477 // |
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478 // new_end : The new value of the end field of this region which |
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479 // points to the end of the last region in the series. If there is |
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480 // one region in the series (namely: this one) end will be the same |
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481 // as the original end of this region. |
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482 // |
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483 // Updating top and end as described above makes this region look as |
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484 // if it spans the entire space taken up by all the regions in the |
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485 // series and an single allocation moved its top to new_top. This |
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486 // ensures that the space (capacity / allocated) taken up by all |
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487 // humongous regions can be calculated by just looking at the |
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488 // "starts humongous" regions and by ignoring the "continues |
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489 // humongous" regions. |
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490 void set_startsHumongous(HeapWord* new_top, HeapWord* new_end); |
342 | 491 |
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492 // Makes the current region be a "continues humongous' |
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493 // region. first_hr is the "start humongous" region of the series |
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494 // which this region will be part of. |
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495 void set_continuesHumongous(HeapRegion* first_hr); |
342 | 496 |
2152 | 497 // Unsets the humongous-related fields on the region. |
498 void set_notHumongous(); | |
499 | |
342 | 500 // If the region has a remembered set, return a pointer to it. |
501 HeapRegionRemSet* rem_set() const { | |
502 return _rem_set; | |
503 } | |
504 | |
505 // True iff the region is in current collection_set. | |
506 bool in_collection_set() const { | |
507 return _in_collection_set; | |
508 } | |
509 void set_in_collection_set(bool b) { | |
510 _in_collection_set = b; | |
511 } | |
512 HeapRegion* next_in_collection_set() { | |
513 assert(in_collection_set(), "should only invoke on member of CS."); | |
514 assert(_next_in_special_set == NULL || | |
515 _next_in_special_set->in_collection_set(), | |
516 "Malformed CS."); | |
517 return _next_in_special_set; | |
518 } | |
519 void set_next_in_collection_set(HeapRegion* r) { | |
520 assert(in_collection_set(), "should only invoke on member of CS."); | |
521 assert(r == NULL || r->in_collection_set(), "Malformed CS."); | |
522 _next_in_special_set = r; | |
523 } | |
524 | |
2152 | 525 // Methods used by the HeapRegionSetBase class and subclasses. |
342 | 526 |
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527 // Getter and setter for the next and prev fields used to link regions into |
2152 | 528 // linked lists. |
529 HeapRegion* next() { return _next; } | |
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530 HeapRegion* prev() { return _prev; } |
2152 | 531 |
532 void set_next(HeapRegion* next) { _next = next; } | |
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533 void set_prev(HeapRegion* prev) { _prev = prev; } |
342 | 534 |
2152 | 535 // Every region added to a set is tagged with a reference to that |
536 // set. This is used for doing consistency checking to make sure that | |
537 // the contents of a set are as they should be and it's only | |
538 // available in non-product builds. | |
539 #ifdef ASSERT | |
540 void set_containing_set(HeapRegionSetBase* containing_set) { | |
541 assert((containing_set == NULL && _containing_set != NULL) || | |
542 (containing_set != NULL && _containing_set == NULL), | |
543 err_msg("containing_set: "PTR_FORMAT" " | |
544 "_containing_set: "PTR_FORMAT, | |
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545 p2i(containing_set), p2i(_containing_set))); |
2152 | 546 |
547 _containing_set = containing_set; | |
2361 | 548 } |
342 | 549 |
2152 | 550 HeapRegionSetBase* containing_set() { return _containing_set; } |
551 #else // ASSERT | |
552 void set_containing_set(HeapRegionSetBase* containing_set) { } | |
342 | 553 |
2361 | 554 // containing_set() is only used in asserts so there's no reason |
2152 | 555 // to provide a dummy version of it. |
556 #endif // ASSERT | |
342 | 557 |
2152 | 558 // If we want to remove regions from a list in bulk we can simply tag |
559 // them with the pending_removal tag and call the | |
560 // remove_all_pending() method on the list. | |
342 | 561 |
2152 | 562 bool pending_removal() { return _pending_removal; } |
563 | |
564 void set_pending_removal(bool pending_removal) { | |
2361 | 565 if (pending_removal) { |
566 assert(!_pending_removal && containing_set() != NULL, | |
567 "can only set pending removal to true if it's false and " | |
568 "the region belongs to a region set"); | |
569 } else { | |
570 assert( _pending_removal && containing_set() == NULL, | |
571 "can only set pending removal to false if it's true and " | |
572 "the region does not belong to a region set"); | |
573 } | |
2152 | 574 |
575 _pending_removal = pending_removal; | |
342 | 576 } |
577 | |
578 HeapRegion* get_next_young_region() { return _next_young_region; } | |
579 void set_next_young_region(HeapRegion* hr) { | |
580 _next_young_region = hr; | |
581 } | |
582 | |
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583 HeapRegion* get_next_dirty_cards_region() const { return _next_dirty_cards_region; } |
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584 HeapRegion** next_dirty_cards_region_addr() { return &_next_dirty_cards_region; } |
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585 void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; } |
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586 bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; } |
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587 |
3766 | 588 HeapWord* orig_end() { return _orig_end; } |
589 | |
342 | 590 // Reset HR stuff to default values. |
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591 void hr_clear(bool par, bool clear_space, bool locked = false); |
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592 void par_clear(); |
342 | 593 |
594 // Get the start of the unmarked area in this region. | |
595 HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } | |
596 HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } | |
597 | |
598 // Note the start or end of marking. This tells the heap region | |
599 // that the collector is about to start or has finished (concurrently) | |
600 // marking the heap. | |
601 | |
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602 // Notify the region that concurrent marking is starting. Initialize |
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603 // all fields related to the next marking info. |
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604 inline void note_start_of_marking(); |
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605 |
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606 // Notify the region that concurrent marking has finished. Copy the |
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607 // (now finalized) next marking info fields into the prev marking |
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608 // info fields. |
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609 inline void note_end_of_marking(); |
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610 |
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611 // Notify the region that it will be used as to-space during a GC |
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612 // and we are about to start copying objects into it. |
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613 inline void note_start_of_copying(bool during_initial_mark); |
342 | 614 |
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615 // Notify the region that it ceases being to-space during a GC and |
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616 // we will not copy objects into it any more. |
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617 inline void note_end_of_copying(bool during_initial_mark); |
342 | 618 |
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619 // Notify the region that we are about to start processing |
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620 // self-forwarded objects during evac failure handling. |
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621 void note_self_forwarding_removal_start(bool during_initial_mark, |
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622 bool during_conc_mark); |
342 | 623 |
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624 // Notify the region that we have finished processing self-forwarded |
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625 // objects during evac failure handling. |
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626 void note_self_forwarding_removal_end(bool during_initial_mark, |
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627 bool during_conc_mark, |
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628 size_t marked_bytes); |
342 | 629 |
630 // Returns "false" iff no object in the region was allocated when the | |
631 // last mark phase ended. | |
632 bool is_marked() { return _prev_top_at_mark_start != bottom(); } | |
633 | |
634 void reset_during_compaction() { | |
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635 assert(isHumongous() && startsHumongous(), |
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636 "should only be called for starts humongous regions"); |
342 | 637 |
638 zero_marked_bytes(); | |
639 init_top_at_mark_start(); | |
640 } | |
641 | |
642 void calc_gc_efficiency(void); | |
643 double gc_efficiency() { return _gc_efficiency;} | |
644 | |
645 bool is_young() const { return _young_type != NotYoung; } | |
646 bool is_survivor() const { return _young_type == Survivor; } | |
647 | |
648 int young_index_in_cset() const { return _young_index_in_cset; } | |
649 void set_young_index_in_cset(int index) { | |
650 assert( (index == -1) || is_young(), "pre-condition" ); | |
651 _young_index_in_cset = index; | |
652 } | |
653 | |
654 int age_in_surv_rate_group() { | |
655 assert( _surv_rate_group != NULL, "pre-condition" ); | |
656 assert( _age_index > -1, "pre-condition" ); | |
657 return _surv_rate_group->age_in_group(_age_index); | |
658 } | |
659 | |
660 void record_surv_words_in_group(size_t words_survived) { | |
661 assert( _surv_rate_group != NULL, "pre-condition" ); | |
662 assert( _age_index > -1, "pre-condition" ); | |
663 int age_in_group = age_in_surv_rate_group(); | |
664 _surv_rate_group->record_surviving_words(age_in_group, words_survived); | |
665 } | |
666 | |
667 int age_in_surv_rate_group_cond() { | |
668 if (_surv_rate_group != NULL) | |
669 return age_in_surv_rate_group(); | |
670 else | |
671 return -1; | |
672 } | |
673 | |
674 SurvRateGroup* surv_rate_group() { | |
675 return _surv_rate_group; | |
676 } | |
677 | |
678 void install_surv_rate_group(SurvRateGroup* surv_rate_group) { | |
679 assert( surv_rate_group != NULL, "pre-condition" ); | |
680 assert( _surv_rate_group == NULL, "pre-condition" ); | |
681 assert( is_young(), "pre-condition" ); | |
682 | |
683 _surv_rate_group = surv_rate_group; | |
684 _age_index = surv_rate_group->next_age_index(); | |
685 } | |
686 | |
687 void uninstall_surv_rate_group() { | |
688 if (_surv_rate_group != NULL) { | |
689 assert( _age_index > -1, "pre-condition" ); | |
690 assert( is_young(), "pre-condition" ); | |
691 | |
692 _surv_rate_group = NULL; | |
693 _age_index = -1; | |
694 } else { | |
695 assert( _age_index == -1, "pre-condition" ); | |
696 } | |
697 } | |
698 | |
699 void set_young() { set_young_type(Young); } | |
700 | |
701 void set_survivor() { set_young_type(Survivor); } | |
702 | |
703 void set_not_young() { set_young_type(NotYoung); } | |
704 | |
705 // Determine if an object has been allocated since the last | |
706 // mark performed by the collector. This returns true iff the object | |
707 // is within the unmarked area of the region. | |
708 bool obj_allocated_since_prev_marking(oop obj) const { | |
709 return (HeapWord *) obj >= prev_top_at_mark_start(); | |
710 } | |
711 bool obj_allocated_since_next_marking(oop obj) const { | |
712 return (HeapWord *) obj >= next_top_at_mark_start(); | |
713 } | |
714 | |
715 // For parallel heapRegion traversal. | |
716 bool claimHeapRegion(int claimValue); | |
717 jint claim_value() { return _claimed; } | |
718 // Use this carefully: only when you're sure no one is claiming... | |
719 void set_claim_value(int claimValue) { _claimed = claimValue; } | |
720 | |
721 // Returns the "evacuation_failed" property of the region. | |
722 bool evacuation_failed() { return _evacuation_failed; } | |
723 | |
724 // Sets the "evacuation_failed" property of the region. | |
725 void set_evacuation_failed(bool b) { | |
726 _evacuation_failed = b; | |
727 | |
728 if (b) { | |
729 _next_marked_bytes = 0; | |
730 } | |
731 } | |
732 | |
733 // Requires that "mr" be entirely within the region. | |
734 // Apply "cl->do_object" to all objects that intersect with "mr". | |
735 // If the iteration encounters an unparseable portion of the region, | |
736 // or if "cl->abort()" is true after a closure application, | |
737 // terminate the iteration and return the address of the start of the | |
738 // subregion that isn't done. (The two can be distinguished by querying | |
739 // "cl->abort()".) Return of "NULL" indicates that the iteration | |
740 // completed. | |
741 HeapWord* | |
742 object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); | |
743 | |
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744 // filter_young: if true and the region is a young region then we |
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745 // skip the iteration. |
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746 // card_ptr: if not NULL, and we decide that the card is not young |
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747 // and we iterate over it, we'll clean the card before we start the |
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748 // iteration. |
342 | 749 HeapWord* |
750 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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751 FilterOutOfRegionClosure* cl, |
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752 bool filter_young, |
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753 jbyte* card_ptr); |
342 | 754 |
755 // A version of block start that is guaranteed to find *some* block | |
756 // boundary at or before "p", but does not object iteration, and may | |
757 // therefore be used safely when the heap is unparseable. | |
758 HeapWord* block_start_careful(const void* p) const { | |
759 return _offsets.block_start_careful(p); | |
760 } | |
761 | |
762 // Requires that "addr" is within the region. Returns the start of the | |
763 // first ("careful") block that starts at or after "addr", or else the | |
764 // "end" of the region if there is no such block. | |
765 HeapWord* next_block_start_careful(HeapWord* addr); | |
766 | |
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767 size_t recorded_rs_length() const { return _recorded_rs_length; } |
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768 double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; } |
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769 size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; } |
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770 |
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771 void set_recorded_rs_length(size_t rs_length) { |
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772 _recorded_rs_length = rs_length; |
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773 } |
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774 |
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775 void set_predicted_elapsed_time_ms(double ms) { |
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776 _predicted_elapsed_time_ms = ms; |
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777 } |
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778 |
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779 void set_predicted_bytes_to_copy(size_t bytes) { |
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780 _predicted_bytes_to_copy = bytes; |
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781 } |
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782 |
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783 virtual CompactibleSpace* next_compaction_space() const; |
342 | 784 |
785 virtual void reset_after_compaction(); | |
786 | |
12080 | 787 // Routines for managing a list of code roots (attached to the |
788 // this region's RSet) that point into this heap region. | |
789 void add_strong_code_root(nmethod* nm); | |
790 void remove_strong_code_root(nmethod* nm); | |
791 | |
792 // During a collection, migrate the successfully evacuated | |
793 // strong code roots that referenced into this region to the | |
794 // new regions that they now point into. Unsuccessfully | |
795 // evacuated code roots are not migrated. | |
796 void migrate_strong_code_roots(); | |
797 | |
798 // Applies blk->do_code_blob() to each of the entries in | |
799 // the strong code roots list for this region | |
800 void strong_code_roots_do(CodeBlobClosure* blk) const; | |
801 | |
802 // Verify that the entries on the strong code root list for this | |
803 // region are live and include at least one pointer into this region. | |
804 void verify_strong_code_roots(VerifyOption vo, bool* failures) const; | |
805 | |
342 | 806 void print() const; |
807 void print_on(outputStream* st) const; | |
808 | |
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809 // vo == UsePrevMarking -> use "prev" marking information, |
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810 // vo == UseNextMarking -> use "next" marking information |
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811 // vo == UseMarkWord -> use the mark word in the object header |
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812 // |
811 | 813 // NOTE: Only the "prev" marking information is guaranteed to be |
814 // consistent most of the time, so most calls to this should use | |
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815 // vo == UsePrevMarking. |
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816 // Currently, there is only one case where this is called with |
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817 // vo == UseNextMarking, which is to verify the "next" marking |
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818 // information at the end of remark. |
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819 // Currently there is only one place where this is called with |
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820 // vo == UseMarkWord, which is to verify the marking during a |
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821 // full GC. |
6008 | 822 void verify(VerifyOption vo, bool *failures) const; |
811 | 823 |
824 // Override; it uses the "prev" marking information | |
6008 | 825 virtual void verify() const; |
342 | 826 }; |
827 | |
828 // HeapRegionClosure is used for iterating over regions. | |
829 // Terminates the iteration when the "doHeapRegion" method returns "true". | |
830 class HeapRegionClosure : public StackObj { | |
831 friend class HeapRegionSeq; | |
832 friend class G1CollectedHeap; | |
833 | |
834 bool _complete; | |
835 void incomplete() { _complete = false; } | |
836 | |
837 public: | |
838 HeapRegionClosure(): _complete(true) {} | |
839 | |
840 // Typically called on each region until it returns true. | |
841 virtual bool doHeapRegion(HeapRegion* r) = 0; | |
842 | |
843 // True after iteration if the closure was applied to all heap regions | |
844 // and returned "false" in all cases. | |
845 bool complete() { return _complete; } | |
846 }; | |
847 | |
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848 #endif // INCLUDE_ALL_GCS |
1972 | 849 |
850 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |