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annotate src/share/vm/gc_implementation/g1/heapRegion.hpp @ 18886:9afe8fbe088c
Add -G:[-/+]PrintIdealGraph option.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Mon, 19 Jan 2015 18:00:28 +0100 |
parents | 78bbf4d43a14 |
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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 | |
28 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
29 #include "gc_implementation/g1/g1_specialized_oop_closures.hpp" | |
30 #include "gc_implementation/g1/survRateGroup.hpp" | |
31 #include "gc_implementation/shared/ageTable.hpp" | |
32 #include "gc_implementation/shared/spaceDecorator.hpp" | |
33 #include "memory/space.inline.hpp" | |
34 #include "memory/watermark.hpp" | |
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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 | |
74 class HeapRegionDCTOC : public ContiguousSpaceDCTOC { | |
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 void walk_mem_region_with_cl(MemRegion mr, | |
89 HeapWord* bottom, HeapWord* top, | |
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90 ExtendedOopClosure* cl); |
342 | 91 |
92 // We don't specialize this for FilteringClosure; filtering is handled by | |
93 // the "FilterKind" mechanism. But we provide this to avoid a compiler | |
94 // warning. | |
95 void walk_mem_region_with_cl(MemRegion mr, | |
96 HeapWord* bottom, HeapWord* top, | |
97 FilteringClosure* cl) { | |
98 HeapRegionDCTOC::walk_mem_region_with_cl(mr, bottom, top, | |
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99 (ExtendedOopClosure*)cl); |
342 | 100 } |
101 | |
102 // Get the actual top of the area on which the closure will | |
103 // operate, given where the top is assumed to be (the end of the | |
104 // memory region passed to do_MemRegion) and where the object | |
105 // at the top is assumed to start. For example, an object may | |
106 // start at the top but actually extend past the assumed top, | |
107 // in which case the top becomes the end of the object. | |
108 HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj) { | |
109 return ContiguousSpaceDCTOC::get_actual_top(top, top_obj); | |
110 } | |
111 | |
112 // Walk the given memory region from bottom to (actual) top | |
113 // looking for objects and applying the oop closure (_cl) to | |
114 // them. The base implementation of this treats the area as | |
115 // blocks, where a block may or may not be an object. Sub- | |
116 // classes should override this to provide more accurate | |
117 // or possibly more efficient walking. | |
118 void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top) { | |
119 Filtering_DCTOC::walk_mem_region(mr, bottom, top); | |
120 } | |
121 | |
122 public: | |
123 HeapRegionDCTOC(G1CollectedHeap* g1, | |
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124 HeapRegion* hr, ExtendedOopClosure* cl, |
342 | 125 CardTableModRefBS::PrecisionStyle precision, |
126 FilterKind fk); | |
127 }; | |
128 | |
129 // The complicating factor is that BlockOffsetTable diverged | |
130 // significantly, and we need functionality that is only in the G1 version. | |
131 // So I copied that code, which led to an alternate G1 version of | |
132 // OffsetTableContigSpace. If the two versions of BlockOffsetTable could | |
133 // be reconciled, then G1OffsetTableContigSpace could go away. | |
134 | |
135 // The idea behind time stamps is the following. Doing a save_marks on | |
136 // all regions at every GC pause is time consuming (if I remember | |
137 // well, 10ms or so). So, we would like to do that only for regions | |
138 // that are GC alloc regions. To achieve this, we use time | |
139 // stamps. For every evacuation pause, G1CollectedHeap generates a | |
140 // unique time stamp (essentially a counter that gets | |
141 // incremented). Every time we want to call save_marks on a region, | |
142 // we set the saved_mark_word to top and also copy the current GC | |
143 // time stamp to the time stamp field of the space. Reading the | |
144 // saved_mark_word involves checking the time stamp of the | |
145 // region. If it is the same as the current GC time stamp, then we | |
146 // can safely read the saved_mark_word field, as it is valid. If the | |
147 // time stamp of the region is not the same as the current GC time | |
148 // stamp, then we instead read top, as the saved_mark_word field is | |
149 // invalid. Time stamps (on the regions and also on the | |
150 // G1CollectedHeap) are reset at every cleanup (we iterate over | |
151 // the regions anyway) and at the end of a Full GC. The current scheme | |
152 // that uses sequential unsigned ints will fail only if we have 4b | |
153 // evacuation pauses between two cleanups, which is _highly_ unlikely. | |
154 | |
155 class G1OffsetTableContigSpace: public ContiguousSpace { | |
156 friend class VMStructs; | |
157 protected: | |
158 G1BlockOffsetArrayContigSpace _offsets; | |
159 Mutex _par_alloc_lock; | |
160 volatile unsigned _gc_time_stamp; | |
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161 // When we need to retire an allocation region, while other threads |
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162 // are also concurrently trying to allocate into it, we typically |
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163 // allocate a dummy object at the end of the region to ensure that |
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164 // no more allocations can take place in it. However, sometimes we |
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165 // want to know where the end of the last "real" object we allocated |
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166 // into the region was and this is what this keeps track. |
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167 HeapWord* _pre_dummy_top; |
342 | 168 |
169 public: | |
170 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
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171 MemRegion mr); |
342 | 172 |
173 void set_bottom(HeapWord* value); | |
174 void set_end(HeapWord* value); | |
175 | |
176 virtual HeapWord* saved_mark_word() const; | |
177 virtual void set_saved_mark(); | |
178 void reset_gc_time_stamp() { _gc_time_stamp = 0; } | |
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179 unsigned get_gc_time_stamp() { return _gc_time_stamp; } |
342 | 180 |
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181 // See the comment above in the declaration of _pre_dummy_top for an |
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182 // explanation of what it is. |
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183 void set_pre_dummy_top(HeapWord* pre_dummy_top) { |
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184 assert(is_in(pre_dummy_top) && pre_dummy_top <= top(), "pre-condition"); |
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185 _pre_dummy_top = pre_dummy_top; |
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186 } |
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187 HeapWord* pre_dummy_top() { |
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188 return (_pre_dummy_top == NULL) ? top() : _pre_dummy_top; |
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189 } |
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190 void reset_pre_dummy_top() { _pre_dummy_top = NULL; } |
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191 |
356 | 192 virtual void clear(bool mangle_space); |
342 | 193 |
194 HeapWord* block_start(const void* p); | |
195 HeapWord* block_start_const(const void* p) const; | |
196 | |
197 // Add offset table update. | |
198 virtual HeapWord* allocate(size_t word_size); | |
199 HeapWord* par_allocate(size_t word_size); | |
200 | |
201 // MarkSweep support phase3 | |
202 virtual HeapWord* initialize_threshold(); | |
203 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
204 | |
205 virtual void print() const; | |
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206 |
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207 void reset_bot() { |
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208 _offsets.zero_bottom_entry(); |
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209 _offsets.initialize_threshold(); |
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210 } |
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211 |
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212 void update_bot_for_object(HeapWord* start, size_t word_size) { |
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213 _offsets.alloc_block(start, word_size); |
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214 } |
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215 |
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216 void print_bot_on(outputStream* out) { |
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217 _offsets.print_on(out); |
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218 } |
342 | 219 }; |
220 | |
221 class HeapRegion: public G1OffsetTableContigSpace { | |
222 friend class VMStructs; | |
223 private: | |
224 | |
355 | 225 enum HumongousType { |
226 NotHumongous = 0, | |
227 StartsHumongous, | |
228 ContinuesHumongous | |
229 }; | |
230 | |
342 | 231 // Requires that the region "mr" be dense with objects, and begin and end |
232 // with an object. | |
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233 void oops_in_mr_iterate(MemRegion mr, ExtendedOopClosure* cl); |
342 | 234 |
235 // The remembered set for this region. | |
236 // (Might want to make this "inline" later, to avoid some alloc failure | |
237 // issues.) | |
238 HeapRegionRemSet* _rem_set; | |
239 | |
240 G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } | |
241 | |
242 protected: | |
3766 | 243 // The index of this region in the heap region sequence. |
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244 uint _hrs_index; |
342 | 245 |
355 | 246 HumongousType _humongous_type; |
342 | 247 // For a humongous region, region in which it starts. |
248 HeapRegion* _humongous_start_region; | |
249 // For the start region of a humongous sequence, it's original end(). | |
250 HeapWord* _orig_end; | |
251 | |
252 // True iff the region is in current collection_set. | |
253 bool _in_collection_set; | |
254 | |
255 // True iff an attempt to evacuate an object in the region failed. | |
256 bool _evacuation_failed; | |
257 | |
258 // A heap region may be a member one of a number of special subsets, each | |
259 // represented as linked lists through the field below. Currently, these | |
260 // sets include: | |
261 // The collection set. | |
262 // The set of allocation regions used in a collection pause. | |
263 // Spaces that may contain gray objects. | |
264 HeapRegion* _next_in_special_set; | |
265 | |
266 // next region in the young "generation" region set | |
267 HeapRegion* _next_young_region; | |
268 | |
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269 // Next region whose cards need cleaning |
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270 HeapRegion* _next_dirty_cards_region; |
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271 |
2152 | 272 // Fields used by the HeapRegionSetBase class and subclasses. |
273 HeapRegion* _next; | |
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274 HeapRegion* _prev; |
2152 | 275 #ifdef ASSERT |
276 HeapRegionSetBase* _containing_set; | |
277 #endif // ASSERT | |
278 bool _pending_removal; | |
279 | |
342 | 280 // For parallel heapRegion traversal. |
281 jint _claimed; | |
282 | |
283 // We use concurrent marking to determine the amount of live data | |
284 // in each heap region. | |
285 size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. | |
286 size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. | |
287 | |
6011 | 288 // The calculated GC efficiency of the region. |
342 | 289 double _gc_efficiency; |
290 | |
291 enum YoungType { | |
292 NotYoung, // a region is not young | |
293 Young, // a region is young | |
3766 | 294 Survivor // a region is young and it contains survivors |
342 | 295 }; |
296 | |
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297 volatile YoungType _young_type; |
342 | 298 int _young_index_in_cset; |
299 SurvRateGroup* _surv_rate_group; | |
300 int _age_index; | |
301 | |
302 // The start of the unmarked area. The unmarked area extends from this | |
303 // word until the top and/or end of the region, and is the part | |
304 // of the region for which no marking was done, i.e. objects may | |
305 // have been allocated in this part since the last mark phase. | |
306 // "prev" is the top at the start of the last completed marking. | |
307 // "next" is the top at the start of the in-progress marking (if any.) | |
308 HeapWord* _prev_top_at_mark_start; | |
309 HeapWord* _next_top_at_mark_start; | |
310 // If a collection pause is in progress, this is the top at the start | |
311 // of that pause. | |
312 | |
313 void init_top_at_mark_start() { | |
314 assert(_prev_marked_bytes == 0 && | |
315 _next_marked_bytes == 0, | |
316 "Must be called after zero_marked_bytes."); | |
317 HeapWord* bot = bottom(); | |
318 _prev_top_at_mark_start = bot; | |
319 _next_top_at_mark_start = bot; | |
320 } | |
321 | |
322 void set_young_type(YoungType new_type) { | |
323 //assert(_young_type != new_type, "setting the same type" ); | |
324 // TODO: add more assertions here | |
325 _young_type = new_type; | |
326 } | |
327 | |
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328 // Cached attributes used in the collection set policy information |
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329 |
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330 // The RSet length that was added to the total value |
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331 // for the collection set. |
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332 size_t _recorded_rs_length; |
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333 |
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334 // The predicted elapsed time that was added to total value |
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335 // for the collection set. |
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336 double _predicted_elapsed_time_ms; |
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337 |
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338 // The predicted number of bytes to copy that was added to |
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339 // the total value for the collection set. |
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340 size_t _predicted_bytes_to_copy; |
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341 |
342 | 342 public: |
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343 HeapRegion(uint hrs_index, |
3766 | 344 G1BlockOffsetSharedArray* sharedOffsetArray, |
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345 MemRegion mr); |
342 | 346 |
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347 static int LogOfHRGrainBytes; |
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348 static int LogOfHRGrainWords; |
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349 |
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350 static size_t GrainBytes; |
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351 static size_t GrainWords; |
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352 static size_t CardsPerRegion; |
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353 |
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354 static size_t align_up_to_region_byte_size(size_t sz) { |
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355 return (sz + (size_t) GrainBytes - 1) & |
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356 ~((1 << (size_t) LogOfHRGrainBytes) - 1); |
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357 } |
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358 |
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359 static size_t max_region_size(); |
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360 |
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361 // It sets up the heap region size (GrainBytes / GrainWords), as |
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362 // well as other related fields that are based on the heap region |
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363 // size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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364 // CardsPerRegion). All those fields are considered constant |
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365 // throughout the JVM's execution, therefore they should only be set |
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366 // up once during initialization time. |
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367 static void setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size); |
342 | 368 |
355 | 369 enum ClaimValues { |
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370 InitialClaimValue = 0, |
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371 FinalCountClaimValue = 1, |
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372 NoteEndClaimValue = 2, |
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373 ScrubRemSetClaimValue = 3, |
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374 ParVerifyClaimValue = 4, |
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375 RebuildRSClaimValue = 5, |
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376 ParEvacFailureClaimValue = 6, |
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377 AggregateCountClaimValue = 7, |
12080 | 378 VerifyCountClaimValue = 8, |
379 ParMarkRootClaimValue = 9 | |
355 | 380 }; |
381 | |
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382 inline HeapWord* par_allocate_no_bot_updates(size_t word_size) { |
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383 assert(is_young(), "we can only skip BOT updates on young regions"); |
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384 return ContiguousSpace::par_allocate(word_size); |
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385 } |
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386 inline HeapWord* allocate_no_bot_updates(size_t word_size) { |
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387 assert(is_young(), "we can only skip BOT updates on young regions"); |
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388 return ContiguousSpace::allocate(word_size); |
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389 } |
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390 |
342 | 391 // If this region is a member of a HeapRegionSeq, the index in that |
392 // sequence, otherwise -1. | |
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393 uint hrs_index() const { return _hrs_index; } |
342 | 394 |
395 // The number of bytes marked live in the region in the last marking phase. | |
396 size_t marked_bytes() { return _prev_marked_bytes; } | |
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397 size_t live_bytes() { |
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398 return (top() - prev_top_at_mark_start()) * HeapWordSize + marked_bytes(); |
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399 } |
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400 |
342 | 401 // The number of bytes counted in the next marking. |
402 size_t next_marked_bytes() { return _next_marked_bytes; } | |
403 // The number of bytes live wrt the next marking. | |
404 size_t next_live_bytes() { | |
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405 return |
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406 (top() - next_top_at_mark_start()) * HeapWordSize + next_marked_bytes(); |
342 | 407 } |
408 | |
409 // A lower bound on the amount of garbage bytes in the region. | |
410 size_t garbage_bytes() { | |
411 size_t used_at_mark_start_bytes = | |
412 (prev_top_at_mark_start() - bottom()) * HeapWordSize; | |
413 assert(used_at_mark_start_bytes >= marked_bytes(), | |
414 "Can't mark more than we have."); | |
415 return used_at_mark_start_bytes - marked_bytes(); | |
416 } | |
417 | |
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418 // Return the amount of bytes we'll reclaim if we collect this |
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419 // region. This includes not only the known garbage bytes in the |
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420 // region but also any unallocated space in it, i.e., [top, end), |
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421 // since it will also be reclaimed if we collect the region. |
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422 size_t reclaimable_bytes() { |
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423 size_t known_live_bytes = live_bytes(); |
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424 assert(known_live_bytes <= capacity(), "sanity"); |
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425 return capacity() - known_live_bytes; |
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426 } |
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427 |
342 | 428 // An upper bound on the number of live bytes in the region. |
429 size_t max_live_bytes() { return used() - garbage_bytes(); } | |
430 | |
431 void add_to_marked_bytes(size_t incr_bytes) { | |
432 _next_marked_bytes = _next_marked_bytes + incr_bytes; | |
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433 assert(_next_marked_bytes <= used(), "invariant" ); |
342 | 434 } |
435 | |
436 void zero_marked_bytes() { | |
437 _prev_marked_bytes = _next_marked_bytes = 0; | |
438 } | |
439 | |
355 | 440 bool isHumongous() const { return _humongous_type != NotHumongous; } |
441 bool startsHumongous() const { return _humongous_type == StartsHumongous; } | |
442 bool continuesHumongous() const { return _humongous_type == ContinuesHumongous; } | |
342 | 443 // For a humongous region, region in which it starts. |
444 HeapRegion* humongous_start_region() const { | |
445 return _humongous_start_region; | |
446 } | |
447 | |
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448 // Return the number of distinct regions that are covered by this region: |
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449 // 1 if the region is not humongous, >= 1 if the region is humongous. |
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450 uint region_num() const { |
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451 if (!isHumongous()) { |
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452 return 1U; |
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453 } else { |
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454 assert(startsHumongous(), "doesn't make sense on HC regions"); |
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455 assert(capacity() % HeapRegion::GrainBytes == 0, "sanity"); |
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456 return (uint) (capacity() >> HeapRegion::LogOfHRGrainBytes); |
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457 } |
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458 } |
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459 |
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460 // Return the index + 1 of the last HC regions that's associated |
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461 // with this HS region. |
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462 uint last_hc_index() const { |
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463 assert(startsHumongous(), "don't call this otherwise"); |
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464 return hrs_index() + region_num(); |
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465 } |
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466 |
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467 // Same as Space::is_in_reserved, but will use the original size of the region. |
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468 // The original size is different only for start humongous regions. They get |
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469 // their _end set up to be the end of the last continues region of the |
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470 // corresponding humongous object. |
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471 bool is_in_reserved_raw(const void* p) const { |
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472 return _bottom <= p && p < _orig_end; |
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473 } |
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474 |
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475 // Makes the current region be a "starts humongous" region, i.e., |
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476 // the first region in a series of one or more contiguous regions |
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477 // that will contain a single "humongous" object. The two parameters |
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478 // are as follows: |
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479 // |
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480 // new_top : The new value of the top field of this region which |
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481 // points to the end of the humongous object that's being |
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482 // allocated. If there is more than one region in the series, top |
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483 // will lie beyond this region's original end field and on the last |
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484 // region in the series. |
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485 // |
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486 // new_end : The new value of the end field of this region which |
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487 // points to the end of the last region in the series. If there is |
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488 // one region in the series (namely: this one) end will be the same |
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489 // as the original end of this region. |
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490 // |
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491 // Updating top and end as described above makes this region look as |
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492 // if it spans the entire space taken up by all the regions in the |
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493 // series and an single allocation moved its top to new_top. This |
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494 // ensures that the space (capacity / allocated) taken up by all |
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495 // humongous regions can be calculated by just looking at the |
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496 // "starts humongous" regions and by ignoring the "continues |
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497 // humongous" regions. |
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498 void set_startsHumongous(HeapWord* new_top, HeapWord* new_end); |
342 | 499 |
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500 // Makes the current region be a "continues humongous' |
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501 // region. first_hr is the "start humongous" region of the series |
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502 // which this region will be part of. |
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503 void set_continuesHumongous(HeapRegion* first_hr); |
342 | 504 |
2152 | 505 // Unsets the humongous-related fields on the region. |
506 void set_notHumongous(); | |
507 | |
342 | 508 // If the region has a remembered set, return a pointer to it. |
509 HeapRegionRemSet* rem_set() const { | |
510 return _rem_set; | |
511 } | |
512 | |
513 // True iff the region is in current collection_set. | |
514 bool in_collection_set() const { | |
515 return _in_collection_set; | |
516 } | |
517 void set_in_collection_set(bool b) { | |
518 _in_collection_set = b; | |
519 } | |
520 HeapRegion* next_in_collection_set() { | |
521 assert(in_collection_set(), "should only invoke on member of CS."); | |
522 assert(_next_in_special_set == NULL || | |
523 _next_in_special_set->in_collection_set(), | |
524 "Malformed CS."); | |
525 return _next_in_special_set; | |
526 } | |
527 void set_next_in_collection_set(HeapRegion* r) { | |
528 assert(in_collection_set(), "should only invoke on member of CS."); | |
529 assert(r == NULL || r->in_collection_set(), "Malformed CS."); | |
530 _next_in_special_set = r; | |
531 } | |
532 | |
2152 | 533 // Methods used by the HeapRegionSetBase class and subclasses. |
342 | 534 |
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535 // Getter and setter for the next and prev fields used to link regions into |
2152 | 536 // linked lists. |
537 HeapRegion* next() { return _next; } | |
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538 HeapRegion* prev() { return _prev; } |
2152 | 539 |
540 void set_next(HeapRegion* next) { _next = next; } | |
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541 void set_prev(HeapRegion* prev) { _prev = prev; } |
342 | 542 |
2152 | 543 // Every region added to a set is tagged with a reference to that |
544 // set. This is used for doing consistency checking to make sure that | |
545 // the contents of a set are as they should be and it's only | |
546 // available in non-product builds. | |
547 #ifdef ASSERT | |
548 void set_containing_set(HeapRegionSetBase* containing_set) { | |
549 assert((containing_set == NULL && _containing_set != NULL) || | |
550 (containing_set != NULL && _containing_set == NULL), | |
551 err_msg("containing_set: "PTR_FORMAT" " | |
552 "_containing_set: "PTR_FORMAT, | |
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553 p2i(containing_set), p2i(_containing_set))); |
2152 | 554 |
555 _containing_set = containing_set; | |
2361 | 556 } |
342 | 557 |
2152 | 558 HeapRegionSetBase* containing_set() { return _containing_set; } |
559 #else // ASSERT | |
560 void set_containing_set(HeapRegionSetBase* containing_set) { } | |
342 | 561 |
2361 | 562 // containing_set() is only used in asserts so there's no reason |
2152 | 563 // to provide a dummy version of it. |
564 #endif // ASSERT | |
342 | 565 |
2152 | 566 // If we want to remove regions from a list in bulk we can simply tag |
567 // them with the pending_removal tag and call the | |
568 // remove_all_pending() method on the list. | |
342 | 569 |
2152 | 570 bool pending_removal() { return _pending_removal; } |
571 | |
572 void set_pending_removal(bool pending_removal) { | |
2361 | 573 if (pending_removal) { |
574 assert(!_pending_removal && containing_set() != NULL, | |
575 "can only set pending removal to true if it's false and " | |
576 "the region belongs to a region set"); | |
577 } else { | |
578 assert( _pending_removal && containing_set() == NULL, | |
579 "can only set pending removal to false if it's true and " | |
580 "the region does not belong to a region set"); | |
581 } | |
2152 | 582 |
583 _pending_removal = pending_removal; | |
342 | 584 } |
585 | |
586 HeapRegion* get_next_young_region() { return _next_young_region; } | |
587 void set_next_young_region(HeapRegion* hr) { | |
588 _next_young_region = hr; | |
589 } | |
590 | |
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591 HeapRegion* get_next_dirty_cards_region() const { return _next_dirty_cards_region; } |
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592 HeapRegion** next_dirty_cards_region_addr() { return &_next_dirty_cards_region; } |
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593 void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; } |
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594 bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; } |
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595 |
3766 | 596 HeapWord* orig_end() { return _orig_end; } |
597 | |
342 | 598 // Allows logical separation between objects allocated before and after. |
599 void save_marks(); | |
600 | |
601 // Reset HR stuff to default values. | |
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602 void hr_clear(bool par, bool clear_space, bool locked = false); |
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603 void par_clear(); |
342 | 604 |
605 // Get the start of the unmarked area in this region. | |
606 HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } | |
607 HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } | |
608 | |
609 // Apply "cl->do_oop" to (the addresses of) all reference fields in objects | |
610 // allocated in the current region before the last call to "save_mark". | |
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611 void oop_before_save_marks_iterate(ExtendedOopClosure* cl); |
342 | 612 |
613 // Note the start or end of marking. This tells the heap region | |
614 // that the collector is about to start or has finished (concurrently) | |
615 // marking the heap. | |
616 | |
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617 // Notify the region that concurrent marking is starting. Initialize |
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618 // all fields related to the next marking info. |
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619 inline void note_start_of_marking(); |
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620 |
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621 // Notify the region that concurrent marking has finished. Copy the |
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622 // (now finalized) next marking info fields into the prev marking |
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623 // info fields. |
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624 inline void note_end_of_marking(); |
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625 |
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626 // Notify the region that it will be used as to-space during a GC |
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627 // and we are about to start copying objects into it. |
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628 inline void note_start_of_copying(bool during_initial_mark); |
342 | 629 |
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630 // Notify the region that it ceases being to-space during a GC and |
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631 // we will not copy objects into it any more. |
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632 inline void note_end_of_copying(bool during_initial_mark); |
342 | 633 |
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634 // Notify the region that we are about to start processing |
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635 // self-forwarded objects during evac failure handling. |
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636 void note_self_forwarding_removal_start(bool during_initial_mark, |
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637 bool during_conc_mark); |
342 | 638 |
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639 // Notify the region that we have finished processing self-forwarded |
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640 // objects during evac failure handling. |
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641 void note_self_forwarding_removal_end(bool during_initial_mark, |
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642 bool during_conc_mark, |
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643 size_t marked_bytes); |
342 | 644 |
645 // Returns "false" iff no object in the region was allocated when the | |
646 // last mark phase ended. | |
647 bool is_marked() { return _prev_top_at_mark_start != bottom(); } | |
648 | |
649 void reset_during_compaction() { | |
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650 assert(isHumongous() && startsHumongous(), |
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651 "should only be called for starts humongous regions"); |
342 | 652 |
653 zero_marked_bytes(); | |
654 init_top_at_mark_start(); | |
655 } | |
656 | |
657 void calc_gc_efficiency(void); | |
658 double gc_efficiency() { return _gc_efficiency;} | |
659 | |
660 bool is_young() const { return _young_type != NotYoung; } | |
661 bool is_survivor() const { return _young_type == Survivor; } | |
662 | |
663 int young_index_in_cset() const { return _young_index_in_cset; } | |
664 void set_young_index_in_cset(int index) { | |
665 assert( (index == -1) || is_young(), "pre-condition" ); | |
666 _young_index_in_cset = index; | |
667 } | |
668 | |
669 int age_in_surv_rate_group() { | |
670 assert( _surv_rate_group != NULL, "pre-condition" ); | |
671 assert( _age_index > -1, "pre-condition" ); | |
672 return _surv_rate_group->age_in_group(_age_index); | |
673 } | |
674 | |
675 void record_surv_words_in_group(size_t words_survived) { | |
676 assert( _surv_rate_group != NULL, "pre-condition" ); | |
677 assert( _age_index > -1, "pre-condition" ); | |
678 int age_in_group = age_in_surv_rate_group(); | |
679 _surv_rate_group->record_surviving_words(age_in_group, words_survived); | |
680 } | |
681 | |
682 int age_in_surv_rate_group_cond() { | |
683 if (_surv_rate_group != NULL) | |
684 return age_in_surv_rate_group(); | |
685 else | |
686 return -1; | |
687 } | |
688 | |
689 SurvRateGroup* surv_rate_group() { | |
690 return _surv_rate_group; | |
691 } | |
692 | |
693 void install_surv_rate_group(SurvRateGroup* surv_rate_group) { | |
694 assert( surv_rate_group != NULL, "pre-condition" ); | |
695 assert( _surv_rate_group == NULL, "pre-condition" ); | |
696 assert( is_young(), "pre-condition" ); | |
697 | |
698 _surv_rate_group = surv_rate_group; | |
699 _age_index = surv_rate_group->next_age_index(); | |
700 } | |
701 | |
702 void uninstall_surv_rate_group() { | |
703 if (_surv_rate_group != NULL) { | |
704 assert( _age_index > -1, "pre-condition" ); | |
705 assert( is_young(), "pre-condition" ); | |
706 | |
707 _surv_rate_group = NULL; | |
708 _age_index = -1; | |
709 } else { | |
710 assert( _age_index == -1, "pre-condition" ); | |
711 } | |
712 } | |
713 | |
714 void set_young() { set_young_type(Young); } | |
715 | |
716 void set_survivor() { set_young_type(Survivor); } | |
717 | |
718 void set_not_young() { set_young_type(NotYoung); } | |
719 | |
720 // Determine if an object has been allocated since the last | |
721 // mark performed by the collector. This returns true iff the object | |
722 // is within the unmarked area of the region. | |
723 bool obj_allocated_since_prev_marking(oop obj) const { | |
724 return (HeapWord *) obj >= prev_top_at_mark_start(); | |
725 } | |
726 bool obj_allocated_since_next_marking(oop obj) const { | |
727 return (HeapWord *) obj >= next_top_at_mark_start(); | |
728 } | |
729 | |
730 // For parallel heapRegion traversal. | |
731 bool claimHeapRegion(int claimValue); | |
732 jint claim_value() { return _claimed; } | |
733 // Use this carefully: only when you're sure no one is claiming... | |
734 void set_claim_value(int claimValue) { _claimed = claimValue; } | |
735 | |
736 // Returns the "evacuation_failed" property of the region. | |
737 bool evacuation_failed() { return _evacuation_failed; } | |
738 | |
739 // Sets the "evacuation_failed" property of the region. | |
740 void set_evacuation_failed(bool b) { | |
741 _evacuation_failed = b; | |
742 | |
743 if (b) { | |
744 _next_marked_bytes = 0; | |
745 } | |
746 } | |
747 | |
748 // Requires that "mr" be entirely within the region. | |
749 // Apply "cl->do_object" to all objects that intersect with "mr". | |
750 // If the iteration encounters an unparseable portion of the region, | |
751 // or if "cl->abort()" is true after a closure application, | |
752 // terminate the iteration and return the address of the start of the | |
753 // subregion that isn't done. (The two can be distinguished by querying | |
754 // "cl->abort()".) Return of "NULL" indicates that the iteration | |
755 // completed. | |
756 HeapWord* | |
757 object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); | |
758 | |
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759 // filter_young: if true and the region is a young region then we |
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760 // skip the iteration. |
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761 // card_ptr: if not NULL, and we decide that the card is not young |
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762 // and we iterate over it, we'll clean the card before we start the |
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763 // iteration. |
342 | 764 HeapWord* |
765 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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766 FilterOutOfRegionClosure* cl, |
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767 bool filter_young, |
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768 jbyte* card_ptr); |
342 | 769 |
770 // A version of block start that is guaranteed to find *some* block | |
771 // boundary at or before "p", but does not object iteration, and may | |
772 // therefore be used safely when the heap is unparseable. | |
773 HeapWord* block_start_careful(const void* p) const { | |
774 return _offsets.block_start_careful(p); | |
775 } | |
776 | |
777 // Requires that "addr" is within the region. Returns the start of the | |
778 // first ("careful") block that starts at or after "addr", or else the | |
779 // "end" of the region if there is no such block. | |
780 HeapWord* next_block_start_careful(HeapWord* addr); | |
781 | |
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782 size_t recorded_rs_length() const { return _recorded_rs_length; } |
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783 double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; } |
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784 size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; } |
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785 |
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786 void set_recorded_rs_length(size_t rs_length) { |
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787 _recorded_rs_length = rs_length; |
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788 } |
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789 |
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790 void set_predicted_elapsed_time_ms(double ms) { |
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791 _predicted_elapsed_time_ms = ms; |
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792 } |
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793 |
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794 void set_predicted_bytes_to_copy(size_t bytes) { |
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795 _predicted_bytes_to_copy = bytes; |
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796 } |
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797 |
342 | 798 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ |
799 virtual void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
800 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DECL) | |
801 | |
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802 virtual CompactibleSpace* next_compaction_space() const; |
342 | 803 |
804 virtual void reset_after_compaction(); | |
805 | |
12080 | 806 // Routines for managing a list of code roots (attached to the |
807 // this region's RSet) that point into this heap region. | |
808 void add_strong_code_root(nmethod* nm); | |
809 void remove_strong_code_root(nmethod* nm); | |
810 | |
811 // During a collection, migrate the successfully evacuated | |
812 // strong code roots that referenced into this region to the | |
813 // new regions that they now point into. Unsuccessfully | |
814 // evacuated code roots are not migrated. | |
815 void migrate_strong_code_roots(); | |
816 | |
817 // Applies blk->do_code_blob() to each of the entries in | |
818 // the strong code roots list for this region | |
819 void strong_code_roots_do(CodeBlobClosure* blk) const; | |
820 | |
821 // Verify that the entries on the strong code root list for this | |
822 // region are live and include at least one pointer into this region. | |
823 void verify_strong_code_roots(VerifyOption vo, bool* failures) const; | |
824 | |
342 | 825 void print() const; |
826 void print_on(outputStream* st) const; | |
827 | |
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828 // vo == UsePrevMarking -> use "prev" marking information, |
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829 // vo == UseNextMarking -> use "next" marking information |
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830 // vo == UseMarkWord -> use the mark word in the object header |
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831 // |
811 | 832 // NOTE: Only the "prev" marking information is guaranteed to be |
833 // consistent most of the time, so most calls to this should use | |
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834 // vo == UsePrevMarking. |
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835 // Currently, there is only one case where this is called with |
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836 // vo == UseNextMarking, which is to verify the "next" marking |
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837 // information at the end of remark. |
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838 // Currently there is only one place where this is called with |
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839 // vo == UseMarkWord, which is to verify the marking during a |
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840 // full GC. |
6008 | 841 void verify(VerifyOption vo, bool *failures) const; |
811 | 842 |
843 // Override; it uses the "prev" marking information | |
6008 | 844 virtual void verify() const; |
342 | 845 }; |
846 | |
847 // HeapRegionClosure is used for iterating over regions. | |
848 // Terminates the iteration when the "doHeapRegion" method returns "true". | |
849 class HeapRegionClosure : public StackObj { | |
850 friend class HeapRegionSeq; | |
851 friend class G1CollectedHeap; | |
852 | |
853 bool _complete; | |
854 void incomplete() { _complete = false; } | |
855 | |
856 public: | |
857 HeapRegionClosure(): _complete(true) {} | |
858 | |
859 // Typically called on each region until it returns true. | |
860 virtual bool doHeapRegion(HeapRegion* r) = 0; | |
861 | |
862 // True after iteration if the closure was applied to all heap regions | |
863 // and returned "false" in all cases. | |
864 bool complete() { return _complete; } | |
865 }; | |
866 | |
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867 #endif // INCLUDE_ALL_GCS |
1972 | 868 |
869 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |