Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegion.hpp @ 20273:9441d22e429a
8047820: G1 Block offset table does not need to support generic Space classes
Reviewed-by: tschatzl, stefank
author | mgerdin |
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date | Wed, 25 Jun 2014 16:53:13 +0200 |
parents | e635a728f9da |
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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 CompactibleSpace; | |
50 class ContiguousSpace; | |
51 class HeapRegionRemSet; | |
52 class HeapRegionRemSetIterator; | |
53 class HeapRegion; | |
2152 | 54 class HeapRegionSetBase; |
12080 | 55 class nmethod; |
2152 | 56 |
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57 #define HR_FORMAT "%u:(%s)["PTR_FORMAT","PTR_FORMAT","PTR_FORMAT"]" |
3766 | 58 #define HR_FORMAT_PARAMS(_hr_) \ |
59 (_hr_)->hrs_index(), \ | |
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60 (_hr_)->is_survivor() ? "S" : (_hr_)->is_young() ? "E" : \ |
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61 (_hr_)->startsHumongous() ? "HS" : \ |
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62 (_hr_)->continuesHumongous() ? "HC" : \ |
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63 !(_hr_)->is_empty() ? "O" : "F", \ |
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64 p2i((_hr_)->bottom()), p2i((_hr_)->top()), p2i((_hr_)->end()) |
342 | 65 |
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66 // sentinel value for hrs_index |
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67 #define G1_NULL_HRS_INDEX ((uint) -1) |
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68 |
342 | 69 // A dirty card to oop closure for heap regions. It |
70 // knows how to get the G1 heap and how to use the bitmap | |
71 // in the concurrent marker used by G1 to filter remembered | |
72 // sets. | |
73 | |
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74 class HeapRegionDCTOC : public DirtyCardToOopClosure { |
342 | 75 public: |
76 // Specification of possible DirtyCardToOopClosure filtering. | |
77 enum FilterKind { | |
78 NoFilterKind, | |
79 IntoCSFilterKind, | |
80 OutOfRegionFilterKind | |
81 }; | |
82 | |
83 protected: | |
84 HeapRegion* _hr; | |
85 FilterKind _fk; | |
86 G1CollectedHeap* _g1; | |
87 | |
88 // Walk the given memory region from bottom to (actual) top | |
89 // looking for objects and applying the oop closure (_cl) to | |
90 // them. The base implementation of this treats the area as | |
91 // blocks, where a block may or may not be an object. Sub- | |
92 // classes should override this to provide more accurate | |
93 // or possibly more efficient walking. | |
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94 void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top); |
342 | 95 |
96 public: | |
97 HeapRegionDCTOC(G1CollectedHeap* g1, | |
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98 HeapRegion* hr, ExtendedOopClosure* cl, |
342 | 99 CardTableModRefBS::PrecisionStyle precision, |
100 FilterKind fk); | |
101 }; | |
102 | |
103 // The complicating factor is that BlockOffsetTable diverged | |
104 // significantly, and we need functionality that is only in the G1 version. | |
105 // So I copied that code, which led to an alternate G1 version of | |
106 // OffsetTableContigSpace. If the two versions of BlockOffsetTable could | |
107 // be reconciled, then G1OffsetTableContigSpace could go away. | |
108 | |
109 // The idea behind time stamps is the following. Doing a save_marks on | |
110 // all regions at every GC pause is time consuming (if I remember | |
111 // well, 10ms or so). So, we would like to do that only for regions | |
112 // that are GC alloc regions. To achieve this, we use time | |
113 // stamps. For every evacuation pause, G1CollectedHeap generates a | |
114 // unique time stamp (essentially a counter that gets | |
115 // incremented). Every time we want to call save_marks on a region, | |
116 // we set the saved_mark_word to top and also copy the current GC | |
117 // time stamp to the time stamp field of the space. Reading the | |
118 // saved_mark_word involves checking the time stamp of the | |
119 // region. If it is the same as the current GC time stamp, then we | |
120 // can safely read the saved_mark_word field, as it is valid. If the | |
121 // time stamp of the region is not the same as the current GC time | |
122 // stamp, then we instead read top, as the saved_mark_word field is | |
123 // invalid. Time stamps (on the regions and also on the | |
124 // G1CollectedHeap) are reset at every cleanup (we iterate over | |
125 // the regions anyway) and at the end of a Full GC. The current scheme | |
126 // that uses sequential unsigned ints will fail only if we have 4b | |
127 // evacuation pauses between two cleanups, which is _highly_ unlikely. | |
128 | |
129 class G1OffsetTableContigSpace: public ContiguousSpace { | |
130 friend class VMStructs; | |
131 protected: | |
132 G1BlockOffsetArrayContigSpace _offsets; | |
133 Mutex _par_alloc_lock; | |
134 volatile unsigned _gc_time_stamp; | |
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135 // When we need to retire an allocation region, while other threads |
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136 // are also concurrently trying to allocate into it, we typically |
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137 // allocate a dummy object at the end of the region to ensure that |
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138 // no more allocations can take place in it. However, sometimes we |
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139 // want to know where the end of the last "real" object we allocated |
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140 // into the region was and this is what this keeps track. |
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141 HeapWord* _pre_dummy_top; |
342 | 142 |
143 public: | |
144 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
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145 MemRegion mr); |
342 | 146 |
147 void set_bottom(HeapWord* value); | |
148 void set_end(HeapWord* value); | |
149 | |
150 virtual HeapWord* saved_mark_word() const; | |
151 virtual void set_saved_mark(); | |
152 void reset_gc_time_stamp() { _gc_time_stamp = 0; } | |
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153 unsigned get_gc_time_stamp() { return _gc_time_stamp; } |
342 | 154 |
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155 // See the comment above in the declaration of _pre_dummy_top for an |
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156 // explanation of what it is. |
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157 void set_pre_dummy_top(HeapWord* pre_dummy_top) { |
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158 assert(is_in(pre_dummy_top) && pre_dummy_top <= top(), "pre-condition"); |
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159 _pre_dummy_top = pre_dummy_top; |
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160 } |
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161 HeapWord* pre_dummy_top() { |
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162 return (_pre_dummy_top == NULL) ? top() : _pre_dummy_top; |
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163 } |
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164 void reset_pre_dummy_top() { _pre_dummy_top = NULL; } |
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165 |
356 | 166 virtual void clear(bool mangle_space); |
342 | 167 |
168 HeapWord* block_start(const void* p); | |
169 HeapWord* block_start_const(const void* p) const; | |
170 | |
171 // Add offset table update. | |
172 virtual HeapWord* allocate(size_t word_size); | |
173 HeapWord* par_allocate(size_t word_size); | |
174 | |
175 // MarkSweep support phase3 | |
176 virtual HeapWord* initialize_threshold(); | |
177 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
178 | |
179 virtual void print() const; | |
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180 |
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181 void reset_bot() { |
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182 _offsets.zero_bottom_entry(); |
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183 _offsets.initialize_threshold(); |
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184 } |
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185 |
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186 void update_bot_for_object(HeapWord* start, size_t word_size) { |
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187 _offsets.alloc_block(start, word_size); |
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188 } |
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189 |
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190 void print_bot_on(outputStream* out) { |
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191 _offsets.print_on(out); |
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192 } |
342 | 193 }; |
194 | |
195 class HeapRegion: public G1OffsetTableContigSpace { | |
196 friend class VMStructs; | |
197 private: | |
198 | |
355 | 199 enum HumongousType { |
200 NotHumongous = 0, | |
201 StartsHumongous, | |
202 ContinuesHumongous | |
203 }; | |
204 | |
342 | 205 // Requires that the region "mr" be dense with objects, and begin and end |
206 // with an object. | |
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207 void oops_in_mr_iterate(MemRegion mr, ExtendedOopClosure* cl); |
342 | 208 |
209 // The remembered set for this region. | |
210 // (Might want to make this "inline" later, to avoid some alloc failure | |
211 // issues.) | |
212 HeapRegionRemSet* _rem_set; | |
213 | |
214 G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } | |
215 | |
216 protected: | |
3766 | 217 // The index of this region in the heap region sequence. |
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218 uint _hrs_index; |
342 | 219 |
355 | 220 HumongousType _humongous_type; |
342 | 221 // For a humongous region, region in which it starts. |
222 HeapRegion* _humongous_start_region; | |
223 // For the start region of a humongous sequence, it's original end(). | |
224 HeapWord* _orig_end; | |
225 | |
226 // True iff the region is in current collection_set. | |
227 bool _in_collection_set; | |
228 | |
229 // True iff an attempt to evacuate an object in the region failed. | |
230 bool _evacuation_failed; | |
231 | |
232 // A heap region may be a member one of a number of special subsets, each | |
233 // represented as linked lists through the field below. Currently, these | |
234 // sets include: | |
235 // The collection set. | |
236 // The set of allocation regions used in a collection pause. | |
237 // Spaces that may contain gray objects. | |
238 HeapRegion* _next_in_special_set; | |
239 | |
240 // next region in the young "generation" region set | |
241 HeapRegion* _next_young_region; | |
242 | |
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243 // Next region whose cards need cleaning |
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244 HeapRegion* _next_dirty_cards_region; |
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245 |
2152 | 246 // Fields used by the HeapRegionSetBase class and subclasses. |
247 HeapRegion* _next; | |
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248 HeapRegion* _prev; |
2152 | 249 #ifdef ASSERT |
250 HeapRegionSetBase* _containing_set; | |
251 #endif // ASSERT | |
252 bool _pending_removal; | |
253 | |
342 | 254 // For parallel heapRegion traversal. |
255 jint _claimed; | |
256 | |
257 // We use concurrent marking to determine the amount of live data | |
258 // in each heap region. | |
259 size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. | |
260 size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. | |
261 | |
6011 | 262 // The calculated GC efficiency of the region. |
342 | 263 double _gc_efficiency; |
264 | |
265 enum YoungType { | |
266 NotYoung, // a region is not young | |
267 Young, // a region is young | |
3766 | 268 Survivor // a region is young and it contains survivors |
342 | 269 }; |
270 | |
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271 volatile YoungType _young_type; |
342 | 272 int _young_index_in_cset; |
273 SurvRateGroup* _surv_rate_group; | |
274 int _age_index; | |
275 | |
276 // The start of the unmarked area. The unmarked area extends from this | |
277 // word until the top and/or end of the region, and is the part | |
278 // of the region for which no marking was done, i.e. objects may | |
279 // have been allocated in this part since the last mark phase. | |
280 // "prev" is the top at the start of the last completed marking. | |
281 // "next" is the top at the start of the in-progress marking (if any.) | |
282 HeapWord* _prev_top_at_mark_start; | |
283 HeapWord* _next_top_at_mark_start; | |
284 // If a collection pause is in progress, this is the top at the start | |
285 // of that pause. | |
286 | |
287 void init_top_at_mark_start() { | |
288 assert(_prev_marked_bytes == 0 && | |
289 _next_marked_bytes == 0, | |
290 "Must be called after zero_marked_bytes."); | |
291 HeapWord* bot = bottom(); | |
292 _prev_top_at_mark_start = bot; | |
293 _next_top_at_mark_start = bot; | |
294 } | |
295 | |
296 void set_young_type(YoungType new_type) { | |
297 //assert(_young_type != new_type, "setting the same type" ); | |
298 // TODO: add more assertions here | |
299 _young_type = new_type; | |
300 } | |
301 | |
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302 // Cached attributes used in the collection set policy information |
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303 |
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304 // The RSet length that was added to the total value |
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305 // for the collection set. |
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306 size_t _recorded_rs_length; |
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307 |
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308 // The predicted elapsed time that was added to total value |
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309 // for the collection set. |
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310 double _predicted_elapsed_time_ms; |
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311 |
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312 // The predicted number of bytes to copy that was added to |
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313 // the total value for the collection set. |
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314 size_t _predicted_bytes_to_copy; |
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315 |
342 | 316 public: |
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317 HeapRegion(uint hrs_index, |
3766 | 318 G1BlockOffsetSharedArray* sharedOffsetArray, |
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319 MemRegion mr); |
342 | 320 |
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321 static int LogOfHRGrainBytes; |
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322 static int LogOfHRGrainWords; |
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323 |
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324 static size_t GrainBytes; |
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325 static size_t GrainWords; |
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326 static size_t CardsPerRegion; |
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327 |
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328 static size_t align_up_to_region_byte_size(size_t sz) { |
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329 return (sz + (size_t) GrainBytes - 1) & |
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330 ~((1 << (size_t) LogOfHRGrainBytes) - 1); |
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331 } |
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332 |
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333 static size_t max_region_size(); |
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334 |
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335 // It sets up the heap region size (GrainBytes / GrainWords), as |
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336 // well as other related fields that are based on the heap region |
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337 // size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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338 // CardsPerRegion). All those fields are considered constant |
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339 // throughout the JVM's execution, therefore they should only be set |
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340 // up once during initialization time. |
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341 static void setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size); |
342 | 342 |
355 | 343 enum ClaimValues { |
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344 InitialClaimValue = 0, |
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345 FinalCountClaimValue = 1, |
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346 NoteEndClaimValue = 2, |
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347 ScrubRemSetClaimValue = 3, |
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348 ParVerifyClaimValue = 4, |
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349 RebuildRSClaimValue = 5, |
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350 ParEvacFailureClaimValue = 6, |
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351 AggregateCountClaimValue = 7, |
12080 | 352 VerifyCountClaimValue = 8, |
353 ParMarkRootClaimValue = 9 | |
355 | 354 }; |
355 | |
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356 inline HeapWord* par_allocate_no_bot_updates(size_t word_size) { |
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357 assert(is_young(), "we can only skip BOT updates on young regions"); |
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358 return ContiguousSpace::par_allocate(word_size); |
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359 } |
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360 inline HeapWord* allocate_no_bot_updates(size_t word_size) { |
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361 assert(is_young(), "we can only skip BOT updates on young regions"); |
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362 return ContiguousSpace::allocate(word_size); |
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363 } |
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364 |
342 | 365 // If this region is a member of a HeapRegionSeq, the index in that |
366 // sequence, otherwise -1. | |
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367 uint hrs_index() const { return _hrs_index; } |
342 | 368 |
369 // The number of bytes marked live in the region in the last marking phase. | |
370 size_t marked_bytes() { return _prev_marked_bytes; } | |
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371 size_t live_bytes() { |
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372 return (top() - prev_top_at_mark_start()) * HeapWordSize + marked_bytes(); |
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373 } |
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374 |
342 | 375 // The number of bytes counted in the next marking. |
376 size_t next_marked_bytes() { return _next_marked_bytes; } | |
377 // The number of bytes live wrt the next marking. | |
378 size_t next_live_bytes() { | |
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379 return |
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380 (top() - next_top_at_mark_start()) * HeapWordSize + next_marked_bytes(); |
342 | 381 } |
382 | |
383 // A lower bound on the amount of garbage bytes in the region. | |
384 size_t garbage_bytes() { | |
385 size_t used_at_mark_start_bytes = | |
386 (prev_top_at_mark_start() - bottom()) * HeapWordSize; | |
387 assert(used_at_mark_start_bytes >= marked_bytes(), | |
388 "Can't mark more than we have."); | |
389 return used_at_mark_start_bytes - marked_bytes(); | |
390 } | |
391 | |
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392 // Return the amount of bytes we'll reclaim if we collect this |
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393 // region. This includes not only the known garbage bytes in the |
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394 // region but also any unallocated space in it, i.e., [top, end), |
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395 // since it will also be reclaimed if we collect the region. |
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396 size_t reclaimable_bytes() { |
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397 size_t known_live_bytes = live_bytes(); |
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398 assert(known_live_bytes <= capacity(), "sanity"); |
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399 return capacity() - known_live_bytes; |
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400 } |
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401 |
342 | 402 // An upper bound on the number of live bytes in the region. |
403 size_t max_live_bytes() { return used() - garbage_bytes(); } | |
404 | |
405 void add_to_marked_bytes(size_t incr_bytes) { | |
406 _next_marked_bytes = _next_marked_bytes + incr_bytes; | |
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407 assert(_next_marked_bytes <= used(), "invariant" ); |
342 | 408 } |
409 | |
410 void zero_marked_bytes() { | |
411 _prev_marked_bytes = _next_marked_bytes = 0; | |
412 } | |
413 | |
355 | 414 bool isHumongous() const { return _humongous_type != NotHumongous; } |
415 bool startsHumongous() const { return _humongous_type == StartsHumongous; } | |
416 bool continuesHumongous() const { return _humongous_type == ContinuesHumongous; } | |
342 | 417 // For a humongous region, region in which it starts. |
418 HeapRegion* humongous_start_region() const { | |
419 return _humongous_start_region; | |
420 } | |
421 | |
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422 // Return the number of distinct regions that are covered by this region: |
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423 // 1 if the region is not humongous, >= 1 if the region is humongous. |
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424 uint region_num() const { |
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425 if (!isHumongous()) { |
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426 return 1U; |
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427 } else { |
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428 assert(startsHumongous(), "doesn't make sense on HC regions"); |
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429 assert(capacity() % HeapRegion::GrainBytes == 0, "sanity"); |
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430 return (uint) (capacity() >> HeapRegion::LogOfHRGrainBytes); |
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431 } |
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432 } |
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433 |
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434 // Return the index + 1 of the last HC regions that's associated |
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435 // with this HS region. |
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436 uint last_hc_index() const { |
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437 assert(startsHumongous(), "don't call this otherwise"); |
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438 return hrs_index() + region_num(); |
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439 } |
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440 |
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441 // Same as Space::is_in_reserved, but will use the original size of the region. |
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442 // The original size is different only for start humongous regions. They get |
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443 // their _end set up to be the end of the last continues region of the |
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444 // corresponding humongous object. |
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445 bool is_in_reserved_raw(const void* p) const { |
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446 return _bottom <= p && p < _orig_end; |
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447 } |
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448 |
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449 // Makes the current region be a "starts humongous" region, i.e., |
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450 // the first region in a series of one or more contiguous regions |
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451 // that will contain a single "humongous" object. The two parameters |
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452 // are as follows: |
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453 // |
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454 // new_top : The new value of the top field of this region which |
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455 // points to the end of the humongous object that's being |
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456 // allocated. If there is more than one region in the series, top |
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457 // will lie beyond this region's original end field and on the last |
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458 // region in the series. |
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459 // |
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460 // new_end : The new value of the end field of this region which |
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461 // points to the end of the last region in the series. If there is |
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462 // one region in the series (namely: this one) end will be the same |
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463 // as the original end of this region. |
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464 // |
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465 // Updating top and end as described above makes this region look as |
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466 // if it spans the entire space taken up by all the regions in the |
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467 // series and an single allocation moved its top to new_top. This |
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468 // ensures that the space (capacity / allocated) taken up by all |
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469 // humongous regions can be calculated by just looking at the |
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470 // "starts humongous" regions and by ignoring the "continues |
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471 // humongous" regions. |
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472 void set_startsHumongous(HeapWord* new_top, HeapWord* new_end); |
342 | 473 |
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474 // Makes the current region be a "continues humongous' |
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475 // region. first_hr is the "start humongous" region of the series |
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476 // which this region will be part of. |
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477 void set_continuesHumongous(HeapRegion* first_hr); |
342 | 478 |
2152 | 479 // Unsets the humongous-related fields on the region. |
480 void set_notHumongous(); | |
481 | |
342 | 482 // If the region has a remembered set, return a pointer to it. |
483 HeapRegionRemSet* rem_set() const { | |
484 return _rem_set; | |
485 } | |
486 | |
487 // True iff the region is in current collection_set. | |
488 bool in_collection_set() const { | |
489 return _in_collection_set; | |
490 } | |
491 void set_in_collection_set(bool b) { | |
492 _in_collection_set = b; | |
493 } | |
494 HeapRegion* next_in_collection_set() { | |
495 assert(in_collection_set(), "should only invoke on member of CS."); | |
496 assert(_next_in_special_set == NULL || | |
497 _next_in_special_set->in_collection_set(), | |
498 "Malformed CS."); | |
499 return _next_in_special_set; | |
500 } | |
501 void set_next_in_collection_set(HeapRegion* r) { | |
502 assert(in_collection_set(), "should only invoke on member of CS."); | |
503 assert(r == NULL || r->in_collection_set(), "Malformed CS."); | |
504 _next_in_special_set = r; | |
505 } | |
506 | |
2152 | 507 // Methods used by the HeapRegionSetBase class and subclasses. |
342 | 508 |
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509 // Getter and setter for the next and prev fields used to link regions into |
2152 | 510 // linked lists. |
511 HeapRegion* next() { return _next; } | |
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512 HeapRegion* prev() { return _prev; } |
2152 | 513 |
514 void set_next(HeapRegion* next) { _next = next; } | |
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515 void set_prev(HeapRegion* prev) { _prev = prev; } |
342 | 516 |
2152 | 517 // Every region added to a set is tagged with a reference to that |
518 // set. This is used for doing consistency checking to make sure that | |
519 // the contents of a set are as they should be and it's only | |
520 // available in non-product builds. | |
521 #ifdef ASSERT | |
522 void set_containing_set(HeapRegionSetBase* containing_set) { | |
523 assert((containing_set == NULL && _containing_set != NULL) || | |
524 (containing_set != NULL && _containing_set == NULL), | |
525 err_msg("containing_set: "PTR_FORMAT" " | |
526 "_containing_set: "PTR_FORMAT, | |
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527 p2i(containing_set), p2i(_containing_set))); |
2152 | 528 |
529 _containing_set = containing_set; | |
2361 | 530 } |
342 | 531 |
2152 | 532 HeapRegionSetBase* containing_set() { return _containing_set; } |
533 #else // ASSERT | |
534 void set_containing_set(HeapRegionSetBase* containing_set) { } | |
342 | 535 |
2361 | 536 // containing_set() is only used in asserts so there's no reason |
2152 | 537 // to provide a dummy version of it. |
538 #endif // ASSERT | |
342 | 539 |
2152 | 540 // If we want to remove regions from a list in bulk we can simply tag |
541 // them with the pending_removal tag and call the | |
542 // remove_all_pending() method on the list. | |
342 | 543 |
2152 | 544 bool pending_removal() { return _pending_removal; } |
545 | |
546 void set_pending_removal(bool pending_removal) { | |
2361 | 547 if (pending_removal) { |
548 assert(!_pending_removal && containing_set() != NULL, | |
549 "can only set pending removal to true if it's false and " | |
550 "the region belongs to a region set"); | |
551 } else { | |
552 assert( _pending_removal && containing_set() == NULL, | |
553 "can only set pending removal to false if it's true and " | |
554 "the region does not belong to a region set"); | |
555 } | |
2152 | 556 |
557 _pending_removal = pending_removal; | |
342 | 558 } |
559 | |
560 HeapRegion* get_next_young_region() { return _next_young_region; } | |
561 void set_next_young_region(HeapRegion* hr) { | |
562 _next_young_region = hr; | |
563 } | |
564 | |
796
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565 HeapRegion* get_next_dirty_cards_region() const { return _next_dirty_cards_region; } |
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566 HeapRegion** next_dirty_cards_region_addr() { return &_next_dirty_cards_region; } |
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567 void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; } |
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568 bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; } |
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569 |
3766 | 570 HeapWord* orig_end() { return _orig_end; } |
571 | |
342 | 572 // Allows logical separation between objects allocated before and after. |
573 void save_marks(); | |
574 | |
575 // Reset HR stuff to default values. | |
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576 void hr_clear(bool par, bool clear_space, bool locked = false); |
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577 void par_clear(); |
342 | 578 |
579 // Get the start of the unmarked area in this region. | |
580 HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } | |
581 HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } | |
582 | |
583 // Apply "cl->do_oop" to (the addresses of) all reference fields in objects | |
584 // allocated in the current region before the last call to "save_mark". | |
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585 void oop_before_save_marks_iterate(ExtendedOopClosure* cl); |
342 | 586 |
587 // Note the start or end of marking. This tells the heap region | |
588 // that the collector is about to start or has finished (concurrently) | |
589 // marking the heap. | |
590 | |
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591 // Notify the region that concurrent marking is starting. Initialize |
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592 // all fields related to the next marking info. |
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593 inline void note_start_of_marking(); |
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594 |
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595 // Notify the region that concurrent marking has finished. Copy the |
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596 // (now finalized) next marking info fields into the prev marking |
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597 // info fields. |
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598 inline void note_end_of_marking(); |
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599 |
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600 // Notify the region that it will be used as to-space during a GC |
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601 // and we are about to start copying objects into it. |
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602 inline void note_start_of_copying(bool during_initial_mark); |
342 | 603 |
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604 // Notify the region that it ceases being to-space during a GC and |
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605 // we will not copy objects into it any more. |
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606 inline void note_end_of_copying(bool during_initial_mark); |
342 | 607 |
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608 // Notify the region that we are about to start processing |
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609 // self-forwarded objects during evac failure handling. |
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610 void note_self_forwarding_removal_start(bool during_initial_mark, |
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611 bool during_conc_mark); |
342 | 612 |
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613 // Notify the region that we have finished processing self-forwarded |
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614 // objects during evac failure handling. |
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615 void note_self_forwarding_removal_end(bool during_initial_mark, |
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616 bool during_conc_mark, |
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617 size_t marked_bytes); |
342 | 618 |
619 // Returns "false" iff no object in the region was allocated when the | |
620 // last mark phase ended. | |
621 bool is_marked() { return _prev_top_at_mark_start != bottom(); } | |
622 | |
623 void reset_during_compaction() { | |
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624 assert(isHumongous() && startsHumongous(), |
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625 "should only be called for starts humongous regions"); |
342 | 626 |
627 zero_marked_bytes(); | |
628 init_top_at_mark_start(); | |
629 } | |
630 | |
631 void calc_gc_efficiency(void); | |
632 double gc_efficiency() { return _gc_efficiency;} | |
633 | |
634 bool is_young() const { return _young_type != NotYoung; } | |
635 bool is_survivor() const { return _young_type == Survivor; } | |
636 | |
637 int young_index_in_cset() const { return _young_index_in_cset; } | |
638 void set_young_index_in_cset(int index) { | |
639 assert( (index == -1) || is_young(), "pre-condition" ); | |
640 _young_index_in_cset = index; | |
641 } | |
642 | |
643 int age_in_surv_rate_group() { | |
644 assert( _surv_rate_group != NULL, "pre-condition" ); | |
645 assert( _age_index > -1, "pre-condition" ); | |
646 return _surv_rate_group->age_in_group(_age_index); | |
647 } | |
648 | |
649 void record_surv_words_in_group(size_t words_survived) { | |
650 assert( _surv_rate_group != NULL, "pre-condition" ); | |
651 assert( _age_index > -1, "pre-condition" ); | |
652 int age_in_group = age_in_surv_rate_group(); | |
653 _surv_rate_group->record_surviving_words(age_in_group, words_survived); | |
654 } | |
655 | |
656 int age_in_surv_rate_group_cond() { | |
657 if (_surv_rate_group != NULL) | |
658 return age_in_surv_rate_group(); | |
659 else | |
660 return -1; | |
661 } | |
662 | |
663 SurvRateGroup* surv_rate_group() { | |
664 return _surv_rate_group; | |
665 } | |
666 | |
667 void install_surv_rate_group(SurvRateGroup* surv_rate_group) { | |
668 assert( surv_rate_group != NULL, "pre-condition" ); | |
669 assert( _surv_rate_group == NULL, "pre-condition" ); | |
670 assert( is_young(), "pre-condition" ); | |
671 | |
672 _surv_rate_group = surv_rate_group; | |
673 _age_index = surv_rate_group->next_age_index(); | |
674 } | |
675 | |
676 void uninstall_surv_rate_group() { | |
677 if (_surv_rate_group != NULL) { | |
678 assert( _age_index > -1, "pre-condition" ); | |
679 assert( is_young(), "pre-condition" ); | |
680 | |
681 _surv_rate_group = NULL; | |
682 _age_index = -1; | |
683 } else { | |
684 assert( _age_index == -1, "pre-condition" ); | |
685 } | |
686 } | |
687 | |
688 void set_young() { set_young_type(Young); } | |
689 | |
690 void set_survivor() { set_young_type(Survivor); } | |
691 | |
692 void set_not_young() { set_young_type(NotYoung); } | |
693 | |
694 // Determine if an object has been allocated since the last | |
695 // mark performed by the collector. This returns true iff the object | |
696 // is within the unmarked area of the region. | |
697 bool obj_allocated_since_prev_marking(oop obj) const { | |
698 return (HeapWord *) obj >= prev_top_at_mark_start(); | |
699 } | |
700 bool obj_allocated_since_next_marking(oop obj) const { | |
701 return (HeapWord *) obj >= next_top_at_mark_start(); | |
702 } | |
703 | |
704 // For parallel heapRegion traversal. | |
705 bool claimHeapRegion(int claimValue); | |
706 jint claim_value() { return _claimed; } | |
707 // Use this carefully: only when you're sure no one is claiming... | |
708 void set_claim_value(int claimValue) { _claimed = claimValue; } | |
709 | |
710 // Returns the "evacuation_failed" property of the region. | |
711 bool evacuation_failed() { return _evacuation_failed; } | |
712 | |
713 // Sets the "evacuation_failed" property of the region. | |
714 void set_evacuation_failed(bool b) { | |
715 _evacuation_failed = b; | |
716 | |
717 if (b) { | |
718 _next_marked_bytes = 0; | |
719 } | |
720 } | |
721 | |
722 // Requires that "mr" be entirely within the region. | |
723 // Apply "cl->do_object" to all objects that intersect with "mr". | |
724 // If the iteration encounters an unparseable portion of the region, | |
725 // or if "cl->abort()" is true after a closure application, | |
726 // terminate the iteration and return the address of the start of the | |
727 // subregion that isn't done. (The two can be distinguished by querying | |
728 // "cl->abort()".) Return of "NULL" indicates that the iteration | |
729 // completed. | |
730 HeapWord* | |
731 object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); | |
732 | |
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733 // filter_young: if true and the region is a young region then we |
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734 // skip the iteration. |
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735 // card_ptr: if not NULL, and we decide that the card is not young |
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736 // and we iterate over it, we'll clean the card before we start the |
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737 // iteration. |
342 | 738 HeapWord* |
739 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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740 FilterOutOfRegionClosure* cl, |
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741 bool filter_young, |
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742 jbyte* card_ptr); |
342 | 743 |
744 // A version of block start that is guaranteed to find *some* block | |
745 // boundary at or before "p", but does not object iteration, and may | |
746 // therefore be used safely when the heap is unparseable. | |
747 HeapWord* block_start_careful(const void* p) const { | |
748 return _offsets.block_start_careful(p); | |
749 } | |
750 | |
751 // Requires that "addr" is within the region. Returns the start of the | |
752 // first ("careful") block that starts at or after "addr", or else the | |
753 // "end" of the region if there is no such block. | |
754 HeapWord* next_block_start_careful(HeapWord* addr); | |
755 | |
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756 size_t recorded_rs_length() const { return _recorded_rs_length; } |
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757 double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; } |
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758 size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; } |
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759 |
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760 void set_recorded_rs_length(size_t rs_length) { |
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761 _recorded_rs_length = rs_length; |
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762 } |
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763 |
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764 void set_predicted_elapsed_time_ms(double ms) { |
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765 _predicted_elapsed_time_ms = ms; |
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766 } |
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767 |
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768 void set_predicted_bytes_to_copy(size_t bytes) { |
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769 _predicted_bytes_to_copy = bytes; |
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770 } |
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771 |
342 | 772 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ |
773 virtual void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
774 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DECL) | |
775 | |
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776 virtual CompactibleSpace* next_compaction_space() const; |
342 | 777 |
778 virtual void reset_after_compaction(); | |
779 | |
12080 | 780 // Routines for managing a list of code roots (attached to the |
781 // this region's RSet) that point into this heap region. | |
782 void add_strong_code_root(nmethod* nm); | |
783 void remove_strong_code_root(nmethod* nm); | |
784 | |
785 // During a collection, migrate the successfully evacuated | |
786 // strong code roots that referenced into this region to the | |
787 // new regions that they now point into. Unsuccessfully | |
788 // evacuated code roots are not migrated. | |
789 void migrate_strong_code_roots(); | |
790 | |
791 // Applies blk->do_code_blob() to each of the entries in | |
792 // the strong code roots list for this region | |
793 void strong_code_roots_do(CodeBlobClosure* blk) const; | |
794 | |
795 // Verify that the entries on the strong code root list for this | |
796 // region are live and include at least one pointer into this region. | |
797 void verify_strong_code_roots(VerifyOption vo, bool* failures) const; | |
798 | |
342 | 799 void print() const; |
800 void print_on(outputStream* st) const; | |
801 | |
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802 // vo == UsePrevMarking -> use "prev" marking information, |
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803 // vo == UseNextMarking -> use "next" marking information |
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804 // vo == UseMarkWord -> use the mark word in the object header |
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805 // |
811 | 806 // NOTE: Only the "prev" marking information is guaranteed to be |
807 // consistent most of the time, so most calls to this should use | |
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808 // vo == UsePrevMarking. |
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809 // Currently, there is only one case where this is called with |
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810 // vo == UseNextMarking, which is to verify the "next" marking |
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811 // information at the end of remark. |
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812 // Currently there is only one place where this is called with |
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813 // vo == UseMarkWord, which is to verify the marking during a |
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814 // full GC. |
6008 | 815 void verify(VerifyOption vo, bool *failures) const; |
811 | 816 |
817 // Override; it uses the "prev" marking information | |
6008 | 818 virtual void verify() const; |
342 | 819 }; |
820 | |
821 // HeapRegionClosure is used for iterating over regions. | |
822 // Terminates the iteration when the "doHeapRegion" method returns "true". | |
823 class HeapRegionClosure : public StackObj { | |
824 friend class HeapRegionSeq; | |
825 friend class G1CollectedHeap; | |
826 | |
827 bool _complete; | |
828 void incomplete() { _complete = false; } | |
829 | |
830 public: | |
831 HeapRegionClosure(): _complete(true) {} | |
832 | |
833 // Typically called on each region until it returns true. | |
834 virtual bool doHeapRegion(HeapRegion* r) = 0; | |
835 | |
836 // True after iteration if the closure was applied to all heap regions | |
837 // and returned "false" in all cases. | |
838 bool complete() { return _complete; } | |
839 }; | |
840 | |
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841 #endif // INCLUDE_ALL_GCS |
1972 | 842 |
843 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |