Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.hpp @ 20469:dd89808e49ba
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Reviewed-by: roland, iveresov
author | vlivanov |
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date | Mon, 14 Jul 2014 03:26:52 -0700 |
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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/g1AllocationContext.hpp" |
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29 #include "gc_implementation/g1/g1BlockOffsetTable.hpp" |
1972 | 30 #include "gc_implementation/g1/g1_specialized_oop_closures.hpp" |
31 #include "gc_implementation/g1/survRateGroup.hpp" | |
32 #include "gc_implementation/shared/ageTable.hpp" | |
33 #include "gc_implementation/shared/spaceDecorator.hpp" | |
34 #include "memory/space.inline.hpp" | |
35 #include "memory/watermark.hpp" | |
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36 #include "utilities/macros.hpp" |
1972 | 37 |
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38 #if INCLUDE_ALL_GCS |
342 | 39 |
40 // A HeapRegion is the smallest piece of a G1CollectedHeap that | |
41 // can be collected independently. | |
42 | |
43 // NOTE: Although a HeapRegion is a Space, its | |
44 // Space::initDirtyCardClosure method must not be called. | |
45 // The problem is that the existence of this method breaks | |
46 // the independence of barrier sets from remembered sets. | |
47 // The solution is to remove this method from the definition | |
48 // of a Space. | |
49 | |
50 class HeapRegionRemSet; | |
51 class HeapRegionRemSetIterator; | |
52 class HeapRegion; | |
2152 | 53 class HeapRegionSetBase; |
12080 | 54 class nmethod; |
2152 | 55 |
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56 #define HR_FORMAT "%u:(%s)["PTR_FORMAT","PTR_FORMAT","PTR_FORMAT"]" |
3766 | 57 #define HR_FORMAT_PARAMS(_hr_) \ |
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58 (_hr_)->hrm_index(), \ |
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59 (_hr_)->is_survivor() ? "S" : (_hr_)->is_young() ? "E" : \ |
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60 (_hr_)->startsHumongous() ? "HS" : \ |
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61 (_hr_)->continuesHumongous() ? "HC" : \ |
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62 !(_hr_)->is_empty() ? "O" : "F", \ |
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63 p2i((_hr_)->bottom()), p2i((_hr_)->top()), p2i((_hr_)->end()) |
342 | 64 |
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65 // sentinel value for hrm_index |
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66 #define G1_NO_HRM_INDEX ((uint) -1) |
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67 |
342 | 68 // A dirty card to oop closure for heap regions. It |
69 // knows how to get the G1 heap and how to use the bitmap | |
70 // in the concurrent marker used by G1 to filter remembered | |
71 // sets. | |
72 | |
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73 class HeapRegionDCTOC : public DirtyCardToOopClosure { |
342 | 74 public: |
75 // Specification of possible DirtyCardToOopClosure filtering. | |
76 enum FilterKind { | |
77 NoFilterKind, | |
78 IntoCSFilterKind, | |
79 OutOfRegionFilterKind | |
80 }; | |
81 | |
82 protected: | |
83 HeapRegion* _hr; | |
84 FilterKind _fk; | |
85 G1CollectedHeap* _g1; | |
86 | |
87 // Walk the given memory region from bottom to (actual) top | |
88 // looking for objects and applying the oop closure (_cl) to | |
89 // them. The base implementation of this treats the area as | |
90 // blocks, where a block may or may not be an object. Sub- | |
91 // classes should override this to provide more accurate | |
92 // or possibly more efficient walking. | |
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93 void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top); |
342 | 94 |
95 public: | |
96 HeapRegionDCTOC(G1CollectedHeap* g1, | |
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97 HeapRegion* hr, ExtendedOopClosure* cl, |
342 | 98 CardTableModRefBS::PrecisionStyle precision, |
99 FilterKind fk); | |
100 }; | |
101 | |
102 // The complicating factor is that BlockOffsetTable diverged | |
103 // significantly, and we need functionality that is only in the G1 version. | |
104 // So I copied that code, which led to an alternate G1 version of | |
105 // OffsetTableContigSpace. If the two versions of BlockOffsetTable could | |
106 // be reconciled, then G1OffsetTableContigSpace could go away. | |
107 | |
108 // The idea behind time stamps is the following. Doing a save_marks on | |
109 // all regions at every GC pause is time consuming (if I remember | |
110 // well, 10ms or so). So, we would like to do that only for regions | |
111 // that are GC alloc regions. To achieve this, we use time | |
112 // stamps. For every evacuation pause, G1CollectedHeap generates a | |
113 // unique time stamp (essentially a counter that gets | |
114 // incremented). Every time we want to call save_marks on a region, | |
115 // we set the saved_mark_word to top and also copy the current GC | |
116 // time stamp to the time stamp field of the space. Reading the | |
117 // saved_mark_word involves checking the time stamp of the | |
118 // region. If it is the same as the current GC time stamp, then we | |
119 // can safely read the saved_mark_word field, as it is valid. If the | |
120 // time stamp of the region is not the same as the current GC time | |
121 // stamp, then we instead read top, as the saved_mark_word field is | |
122 // invalid. Time stamps (on the regions and also on the | |
123 // G1CollectedHeap) are reset at every cleanup (we iterate over | |
124 // the regions anyway) and at the end of a Full GC. The current scheme | |
125 // that uses sequential unsigned ints will fail only if we have 4b | |
126 // evacuation pauses between two cleanups, which is _highly_ unlikely. | |
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127 class G1OffsetTableContigSpace: public CompactibleSpace { |
342 | 128 friend class VMStructs; |
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129 HeapWord* _top; |
342 | 130 protected: |
131 G1BlockOffsetArrayContigSpace _offsets; | |
132 Mutex _par_alloc_lock; | |
133 volatile unsigned _gc_time_stamp; | |
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134 // When we need to retire an allocation region, while other threads |
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135 // are also concurrently trying to allocate into it, we typically |
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136 // allocate a dummy object at the end of the region to ensure that |
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137 // no more allocations can take place in it. However, sometimes we |
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138 // want to know where the end of the last "real" object we allocated |
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139 // into the region was and this is what this keeps track. |
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140 HeapWord* _pre_dummy_top; |
342 | 141 |
142 public: | |
143 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
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144 MemRegion mr); |
342 | 145 |
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146 void set_top(HeapWord* value) { _top = value; } |
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147 HeapWord* top() const { return _top; } |
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148 |
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149 protected: |
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150 // Reset the G1OffsetTableContigSpace. |
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151 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
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152 |
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153 HeapWord** top_addr() { return &_top; } |
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154 // Allocation helpers (return NULL if full). |
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155 inline HeapWord* allocate_impl(size_t word_size, HeapWord* end_value); |
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156 inline HeapWord* par_allocate_impl(size_t word_size, HeapWord* end_value); |
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157 |
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158 public: |
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159 void reset_after_compaction() { set_top(compaction_top()); } |
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160 |
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161 size_t used() const { return byte_size(bottom(), top()); } |
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162 size_t free() const { return byte_size(top(), end()); } |
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163 bool is_free_block(const HeapWord* p) const { return p >= top(); } |
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164 |
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165 MemRegion used_region() const { return MemRegion(bottom(), top()); } |
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166 |
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167 void object_iterate(ObjectClosure* blk); |
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168 void safe_object_iterate(ObjectClosure* blk); |
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169 |
342 | 170 void set_bottom(HeapWord* value); |
171 void set_end(HeapWord* value); | |
172 | |
173 virtual HeapWord* saved_mark_word() const; | |
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174 void record_top_and_timestamp(); |
342 | 175 void reset_gc_time_stamp() { _gc_time_stamp = 0; } |
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176 unsigned get_gc_time_stamp() { return _gc_time_stamp; } |
342 | 177 |
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178 // See the comment above in the declaration of _pre_dummy_top for an |
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179 // explanation of what it is. |
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180 void set_pre_dummy_top(HeapWord* pre_dummy_top) { |
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181 assert(is_in(pre_dummy_top) && pre_dummy_top <= top(), "pre-condition"); |
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182 _pre_dummy_top = pre_dummy_top; |
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183 } |
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184 HeapWord* pre_dummy_top() { |
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185 return (_pre_dummy_top == NULL) ? top() : _pre_dummy_top; |
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186 } |
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187 void reset_pre_dummy_top() { _pre_dummy_top = NULL; } |
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188 |
356 | 189 virtual void clear(bool mangle_space); |
342 | 190 |
191 HeapWord* block_start(const void* p); | |
192 HeapWord* block_start_const(const void* p) const; | |
193 | |
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194 void prepare_for_compaction(CompactPoint* cp); |
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195 |
342 | 196 // Add offset table update. |
197 virtual HeapWord* allocate(size_t word_size); | |
198 HeapWord* par_allocate(size_t word_size); | |
199 | |
200 // MarkSweep support phase3 | |
201 virtual HeapWord* initialize_threshold(); | |
202 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
203 | |
204 virtual void print() const; | |
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205 |
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206 void reset_bot() { |
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207 _offsets.reset_bot(); |
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208 } |
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209 |
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210 void update_bot_for_object(HeapWord* start, size_t word_size) { |
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211 _offsets.alloc_block(start, word_size); |
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212 } |
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213 |
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214 void print_bot_on(outputStream* out) { |
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215 _offsets.print_on(out); |
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216 } |
342 | 217 }; |
218 | |
219 class HeapRegion: public G1OffsetTableContigSpace { | |
220 friend class VMStructs; | |
221 private: | |
222 | |
355 | 223 enum HumongousType { |
224 NotHumongous = 0, | |
225 StartsHumongous, | |
226 ContinuesHumongous | |
227 }; | |
228 | |
342 | 229 // The remembered set for this region. |
230 // (Might want to make this "inline" later, to avoid some alloc failure | |
231 // issues.) | |
232 HeapRegionRemSet* _rem_set; | |
233 | |
234 G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } | |
235 | |
236 protected: | |
3766 | 237 // The index of this region in the heap region sequence. |
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238 uint _hrm_index; |
342 | 239 |
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240 AllocationContext_t _allocation_context; |
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241 |
355 | 242 HumongousType _humongous_type; |
342 | 243 // For a humongous region, region in which it starts. |
244 HeapRegion* _humongous_start_region; | |
245 // For the start region of a humongous sequence, it's original end(). | |
246 HeapWord* _orig_end; | |
247 | |
248 // True iff the region is in current collection_set. | |
249 bool _in_collection_set; | |
250 | |
251 // True iff an attempt to evacuate an object in the region failed. | |
252 bool _evacuation_failed; | |
253 | |
254 // A heap region may be a member one of a number of special subsets, each | |
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255 // represented as linked lists through the field below. Currently, there |
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256 // is only one set: |
342 | 257 // The collection set. |
258 HeapRegion* _next_in_special_set; | |
259 | |
260 // next region in the young "generation" region set | |
261 HeapRegion* _next_young_region; | |
262 | |
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263 // Next region whose cards need cleaning |
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264 HeapRegion* _next_dirty_cards_region; |
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265 |
2152 | 266 // Fields used by the HeapRegionSetBase class and subclasses. |
267 HeapRegion* _next; | |
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268 HeapRegion* _prev; |
2152 | 269 #ifdef ASSERT |
270 HeapRegionSetBase* _containing_set; | |
271 #endif // ASSERT | |
272 | |
342 | 273 // For parallel heapRegion traversal. |
274 jint _claimed; | |
275 | |
276 // We use concurrent marking to determine the amount of live data | |
277 // in each heap region. | |
278 size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. | |
279 size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. | |
280 | |
6011 | 281 // The calculated GC efficiency of the region. |
342 | 282 double _gc_efficiency; |
283 | |
284 enum YoungType { | |
285 NotYoung, // a region is not young | |
286 Young, // a region is young | |
3766 | 287 Survivor // a region is young and it contains survivors |
342 | 288 }; |
289 | |
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290 volatile YoungType _young_type; |
342 | 291 int _young_index_in_cset; |
292 SurvRateGroup* _surv_rate_group; | |
293 int _age_index; | |
294 | |
295 // The start of the unmarked area. The unmarked area extends from this | |
296 // word until the top and/or end of the region, and is the part | |
297 // of the region for which no marking was done, i.e. objects may | |
298 // have been allocated in this part since the last mark phase. | |
299 // "prev" is the top at the start of the last completed marking. | |
300 // "next" is the top at the start of the in-progress marking (if any.) | |
301 HeapWord* _prev_top_at_mark_start; | |
302 HeapWord* _next_top_at_mark_start; | |
303 // If a collection pause is in progress, this is the top at the start | |
304 // of that pause. | |
305 | |
306 void init_top_at_mark_start() { | |
307 assert(_prev_marked_bytes == 0 && | |
308 _next_marked_bytes == 0, | |
309 "Must be called after zero_marked_bytes."); | |
310 HeapWord* bot = bottom(); | |
311 _prev_top_at_mark_start = bot; | |
312 _next_top_at_mark_start = bot; | |
313 } | |
314 | |
315 void set_young_type(YoungType new_type) { | |
316 //assert(_young_type != new_type, "setting the same type" ); | |
317 // TODO: add more assertions here | |
318 _young_type = new_type; | |
319 } | |
320 | |
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321 // Cached attributes used in the collection set policy information |
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322 |
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323 // The RSet length that was added to the total value |
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324 // for the collection set. |
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325 size_t _recorded_rs_length; |
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326 |
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327 // The predicted elapsed time that was added to total value |
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328 // for the collection set. |
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329 double _predicted_elapsed_time_ms; |
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330 |
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331 // The predicted number of bytes to copy that was added to |
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332 // the total value for the collection set. |
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333 size_t _predicted_bytes_to_copy; |
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334 |
342 | 335 public: |
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336 HeapRegion(uint hrm_index, |
3766 | 337 G1BlockOffsetSharedArray* sharedOffsetArray, |
20417 | 338 MemRegion mr); |
342 | 339 |
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340 // Initializing the HeapRegion not only resets the data structure, but also |
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341 // resets the BOT for that heap region. |
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342 // The default values for clear_space means that we will do the clearing if |
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343 // there's clearing to be done ourselves. We also always mangle the space. |
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344 virtual void initialize(MemRegion mr, bool clear_space = false, bool mangle_space = SpaceDecorator::Mangle); |
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345 |
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346 static int LogOfHRGrainBytes; |
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347 static int LogOfHRGrainWords; |
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348 |
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349 static size_t GrainBytes; |
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350 static size_t GrainWords; |
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351 static size_t CardsPerRegion; |
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352 |
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353 static size_t align_up_to_region_byte_size(size_t sz) { |
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354 return (sz + (size_t) GrainBytes - 1) & |
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355 ~((1 << (size_t) LogOfHRGrainBytes) - 1); |
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356 } |
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357 |
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358 static size_t max_region_size(); |
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359 |
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360 // It sets up the heap region size (GrainBytes / GrainWords), as |
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361 // well as other related fields that are based on the heap region |
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362 // size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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363 // CardsPerRegion). All those fields are considered constant |
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364 // throughout the JVM's execution, therefore they should only be set |
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365 // up once during initialization time. |
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366 static void setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size); |
342 | 367 |
355 | 368 enum ClaimValues { |
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369 InitialClaimValue = 0, |
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370 FinalCountClaimValue = 1, |
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371 NoteEndClaimValue = 2, |
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372 ScrubRemSetClaimValue = 3, |
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373 ParVerifyClaimValue = 4, |
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374 RebuildRSClaimValue = 5, |
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375 ParEvacFailureClaimValue = 6, |
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376 AggregateCountClaimValue = 7, |
12080 | 377 VerifyCountClaimValue = 8, |
378 ParMarkRootClaimValue = 9 | |
355 | 379 }; |
380 | |
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381 // All allocated blocks are occupied by objects in a HeapRegion |
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382 bool block_is_obj(const HeapWord* p) const; |
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383 |
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384 // Returns the object size for all valid block starts |
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385 // and the amount of unallocated words if called on top() |
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386 size_t block_size(const HeapWord* p) const; |
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387 |
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388 inline HeapWord* par_allocate_no_bot_updates(size_t word_size); |
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389 inline HeapWord* allocate_no_bot_updates(size_t word_size); |
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390 |
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391 // If this region is a member of a HeapRegionManager, the index in that |
342 | 392 // sequence, otherwise -1. |
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393 uint hrm_index() const { return _hrm_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 hrm_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 | |
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533 void set_allocation_context(AllocationContext_t context) { |
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534 _allocation_context = context; |
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535 } |
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536 |
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537 AllocationContext_t allocation_context() const { |
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538 return _allocation_context; |
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539 } |
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540 |
2152 | 541 // Methods used by the HeapRegionSetBase class and subclasses. |
342 | 542 |
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543 // Getter and setter for the next and prev fields used to link regions into |
2152 | 544 // linked lists. |
545 HeapRegion* next() { return _next; } | |
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546 HeapRegion* prev() { return _prev; } |
2152 | 547 |
548 void set_next(HeapRegion* next) { _next = next; } | |
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549 void set_prev(HeapRegion* prev) { _prev = prev; } |
342 | 550 |
2152 | 551 // Every region added to a set is tagged with a reference to that |
552 // set. This is used for doing consistency checking to make sure that | |
553 // the contents of a set are as they should be and it's only | |
554 // available in non-product builds. | |
555 #ifdef ASSERT | |
556 void set_containing_set(HeapRegionSetBase* containing_set) { | |
557 assert((containing_set == NULL && _containing_set != NULL) || | |
558 (containing_set != NULL && _containing_set == NULL), | |
559 err_msg("containing_set: "PTR_FORMAT" " | |
560 "_containing_set: "PTR_FORMAT, | |
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561 p2i(containing_set), p2i(_containing_set))); |
2152 | 562 |
563 _containing_set = containing_set; | |
2361 | 564 } |
342 | 565 |
2152 | 566 HeapRegionSetBase* containing_set() { return _containing_set; } |
567 #else // ASSERT | |
568 void set_containing_set(HeapRegionSetBase* containing_set) { } | |
342 | 569 |
2361 | 570 // containing_set() is only used in asserts so there's no reason |
2152 | 571 // to provide a dummy version of it. |
572 #endif // ASSERT | |
342 | 573 |
574 HeapRegion* get_next_young_region() { return _next_young_region; } | |
575 void set_next_young_region(HeapRegion* hr) { | |
576 _next_young_region = hr; | |
577 } | |
578 | |
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579 HeapRegion* get_next_dirty_cards_region() const { return _next_dirty_cards_region; } |
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580 HeapRegion** next_dirty_cards_region_addr() { return &_next_dirty_cards_region; } |
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581 void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; } |
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582 bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; } |
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583 |
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584 HeapWord* orig_end() const { return _orig_end; } |
3766 | 585 |
342 | 586 // Reset HR stuff to default values. |
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587 void hr_clear(bool par, bool clear_space, bool locked = false); |
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588 void par_clear(); |
342 | 589 |
590 // Get the start of the unmarked area in this region. | |
591 HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } | |
592 HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } | |
593 | |
594 // Note the start or end of marking. This tells the heap region | |
595 // that the collector is about to start or has finished (concurrently) | |
596 // marking the heap. | |
597 | |
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598 // Notify the region that concurrent marking is starting. Initialize |
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599 // all fields related to the next marking info. |
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600 inline void note_start_of_marking(); |
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601 |
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602 // Notify the region that concurrent marking has finished. Copy the |
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603 // (now finalized) next marking info fields into the prev marking |
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604 // info fields. |
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605 inline void note_end_of_marking(); |
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606 |
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607 // Notify the region that it will be used as to-space during a GC |
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608 // and we are about to start copying objects into it. |
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609 inline void note_start_of_copying(bool during_initial_mark); |
342 | 610 |
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611 // Notify the region that it ceases being to-space during a GC and |
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612 // we will not copy objects into it any more. |
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613 inline void note_end_of_copying(bool during_initial_mark); |
342 | 614 |
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615 // Notify the region that we are about to start processing |
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616 // self-forwarded objects during evac failure handling. |
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617 void note_self_forwarding_removal_start(bool during_initial_mark, |
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618 bool during_conc_mark); |
342 | 619 |
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620 // Notify the region that we have finished processing self-forwarded |
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621 // objects during evac failure handling. |
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622 void note_self_forwarding_removal_end(bool during_initial_mark, |
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623 bool during_conc_mark, |
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624 size_t marked_bytes); |
342 | 625 |
626 // Returns "false" iff no object in the region was allocated when the | |
627 // last mark phase ended. | |
628 bool is_marked() { return _prev_top_at_mark_start != bottom(); } | |
629 | |
630 void reset_during_compaction() { | |
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631 assert(isHumongous() && startsHumongous(), |
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632 "should only be called for starts humongous regions"); |
342 | 633 |
634 zero_marked_bytes(); | |
635 init_top_at_mark_start(); | |
636 } | |
637 | |
638 void calc_gc_efficiency(void); | |
639 double gc_efficiency() { return _gc_efficiency;} | |
640 | |
641 bool is_young() const { return _young_type != NotYoung; } | |
642 bool is_survivor() const { return _young_type == Survivor; } | |
643 | |
644 int young_index_in_cset() const { return _young_index_in_cset; } | |
645 void set_young_index_in_cset(int index) { | |
646 assert( (index == -1) || is_young(), "pre-condition" ); | |
647 _young_index_in_cset = index; | |
648 } | |
649 | |
650 int age_in_surv_rate_group() { | |
651 assert( _surv_rate_group != NULL, "pre-condition" ); | |
652 assert( _age_index > -1, "pre-condition" ); | |
653 return _surv_rate_group->age_in_group(_age_index); | |
654 } | |
655 | |
656 void record_surv_words_in_group(size_t words_survived) { | |
657 assert( _surv_rate_group != NULL, "pre-condition" ); | |
658 assert( _age_index > -1, "pre-condition" ); | |
659 int age_in_group = age_in_surv_rate_group(); | |
660 _surv_rate_group->record_surviving_words(age_in_group, words_survived); | |
661 } | |
662 | |
663 int age_in_surv_rate_group_cond() { | |
664 if (_surv_rate_group != NULL) | |
665 return age_in_surv_rate_group(); | |
666 else | |
667 return -1; | |
668 } | |
669 | |
670 SurvRateGroup* surv_rate_group() { | |
671 return _surv_rate_group; | |
672 } | |
673 | |
674 void install_surv_rate_group(SurvRateGroup* surv_rate_group) { | |
675 assert( surv_rate_group != NULL, "pre-condition" ); | |
676 assert( _surv_rate_group == NULL, "pre-condition" ); | |
677 assert( is_young(), "pre-condition" ); | |
678 | |
679 _surv_rate_group = surv_rate_group; | |
680 _age_index = surv_rate_group->next_age_index(); | |
681 } | |
682 | |
683 void uninstall_surv_rate_group() { | |
684 if (_surv_rate_group != NULL) { | |
685 assert( _age_index > -1, "pre-condition" ); | |
686 assert( is_young(), "pre-condition" ); | |
687 | |
688 _surv_rate_group = NULL; | |
689 _age_index = -1; | |
690 } else { | |
691 assert( _age_index == -1, "pre-condition" ); | |
692 } | |
693 } | |
694 | |
695 void set_young() { set_young_type(Young); } | |
696 | |
697 void set_survivor() { set_young_type(Survivor); } | |
698 | |
699 void set_not_young() { set_young_type(NotYoung); } | |
700 | |
701 // Determine if an object has been allocated since the last | |
702 // mark performed by the collector. This returns true iff the object | |
703 // is within the unmarked area of the region. | |
704 bool obj_allocated_since_prev_marking(oop obj) const { | |
705 return (HeapWord *) obj >= prev_top_at_mark_start(); | |
706 } | |
707 bool obj_allocated_since_next_marking(oop obj) const { | |
708 return (HeapWord *) obj >= next_top_at_mark_start(); | |
709 } | |
710 | |
711 // For parallel heapRegion traversal. | |
712 bool claimHeapRegion(int claimValue); | |
713 jint claim_value() { return _claimed; } | |
714 // Use this carefully: only when you're sure no one is claiming... | |
715 void set_claim_value(int claimValue) { _claimed = claimValue; } | |
716 | |
717 // Returns the "evacuation_failed" property of the region. | |
718 bool evacuation_failed() { return _evacuation_failed; } | |
719 | |
720 // Sets the "evacuation_failed" property of the region. | |
721 void set_evacuation_failed(bool b) { | |
722 _evacuation_failed = b; | |
723 | |
724 if (b) { | |
725 _next_marked_bytes = 0; | |
726 } | |
727 } | |
728 | |
729 // Requires that "mr" be entirely within the region. | |
730 // Apply "cl->do_object" to all objects that intersect with "mr". | |
731 // If the iteration encounters an unparseable portion of the region, | |
732 // or if "cl->abort()" is true after a closure application, | |
733 // terminate the iteration and return the address of the start of the | |
734 // subregion that isn't done. (The two can be distinguished by querying | |
735 // "cl->abort()".) Return of "NULL" indicates that the iteration | |
736 // completed. | |
737 HeapWord* | |
738 object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); | |
739 | |
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740 // filter_young: if true and the region is a young region then we |
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741 // skip the iteration. |
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742 // card_ptr: if not NULL, and we decide that the card is not young |
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743 // and we iterate over it, we'll clean the card before we start the |
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744 // iteration. |
342 | 745 HeapWord* |
746 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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747 FilterOutOfRegionClosure* cl, |
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748 bool filter_young, |
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749 jbyte* card_ptr); |
342 | 750 |
751 // A version of block start that is guaranteed to find *some* block | |
752 // boundary at or before "p", but does not object iteration, and may | |
753 // therefore be used safely when the heap is unparseable. | |
754 HeapWord* block_start_careful(const void* p) const { | |
755 return _offsets.block_start_careful(p); | |
756 } | |
757 | |
758 // Requires that "addr" is within the region. Returns the start of the | |
759 // first ("careful") block that starts at or after "addr", or else the | |
760 // "end" of the region if there is no such block. | |
761 HeapWord* next_block_start_careful(HeapWord* addr); | |
762 | |
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763 size_t recorded_rs_length() const { return _recorded_rs_length; } |
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764 double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; } |
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765 size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; } |
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766 |
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767 void set_recorded_rs_length(size_t rs_length) { |
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768 _recorded_rs_length = rs_length; |
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769 } |
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770 |
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771 void set_predicted_elapsed_time_ms(double ms) { |
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772 _predicted_elapsed_time_ms = ms; |
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773 } |
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774 |
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775 void set_predicted_bytes_to_copy(size_t bytes) { |
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776 _predicted_bytes_to_copy = bytes; |
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777 } |
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778 |
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779 virtual CompactibleSpace* next_compaction_space() const; |
342 | 780 |
781 virtual void reset_after_compaction(); | |
782 | |
12080 | 783 // Routines for managing a list of code roots (attached to the |
784 // this region's RSet) that point into this heap region. | |
785 void add_strong_code_root(nmethod* nm); | |
786 void remove_strong_code_root(nmethod* nm); | |
787 | |
788 // During a collection, migrate the successfully evacuated | |
789 // strong code roots that referenced into this region to the | |
790 // new regions that they now point into. Unsuccessfully | |
791 // evacuated code roots are not migrated. | |
792 void migrate_strong_code_roots(); | |
793 | |
794 // Applies blk->do_code_blob() to each of the entries in | |
795 // the strong code roots list for this region | |
796 void strong_code_roots_do(CodeBlobClosure* blk) const; | |
797 | |
798 // Verify that the entries on the strong code root list for this | |
799 // region are live and include at least one pointer into this region. | |
800 void verify_strong_code_roots(VerifyOption vo, bool* failures) const; | |
801 | |
342 | 802 void print() const; |
803 void print_on(outputStream* st) const; | |
804 | |
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805 // vo == UsePrevMarking -> use "prev" marking information, |
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806 // vo == UseNextMarking -> use "next" marking information |
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807 // vo == UseMarkWord -> use the mark word in the object header |
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808 // |
811 | 809 // NOTE: Only the "prev" marking information is guaranteed to be |
810 // consistent most of the time, so most calls to this should use | |
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811 // vo == UsePrevMarking. |
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812 // Currently, there is only one case where this is called with |
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813 // vo == UseNextMarking, which is to verify the "next" marking |
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814 // information at the end of remark. |
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815 // Currently there is only one place where this is called with |
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816 // vo == UseMarkWord, which is to verify the marking during a |
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817 // full GC. |
6008 | 818 void verify(VerifyOption vo, bool *failures) const; |
811 | 819 |
820 // Override; it uses the "prev" marking information | |
6008 | 821 virtual void verify() const; |
342 | 822 }; |
823 | |
824 // HeapRegionClosure is used for iterating over regions. | |
825 // Terminates the iteration when the "doHeapRegion" method returns "true". | |
826 class HeapRegionClosure : public StackObj { | |
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827 friend class HeapRegionManager; |
342 | 828 friend class G1CollectedHeap; |
829 | |
830 bool _complete; | |
831 void incomplete() { _complete = false; } | |
832 | |
833 public: | |
834 HeapRegionClosure(): _complete(true) {} | |
835 | |
836 // Typically called on each region until it returns true. | |
837 virtual bool doHeapRegion(HeapRegion* r) = 0; | |
838 | |
839 // True after iteration if the closure was applied to all heap regions | |
840 // and returned "false" in all cases. | |
841 bool complete() { return _complete; } | |
842 }; | |
843 | |
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844 #endif // INCLUDE_ALL_GCS |
1972 | 845 |
846 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |