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annotate src/share/vm/memory/genCollectedHeap.hpp @ 14521:29ccc4cbabca
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author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Wed, 12 Mar 2014 13:30:08 +0100 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_MEMORY_GENCOLLECTEDHEAP_HPP |
26 #define SHARE_VM_MEMORY_GENCOLLECTEDHEAP_HPP | |
27 | |
28 #include "gc_implementation/shared/adaptiveSizePolicy.hpp" | |
29 #include "memory/collectorPolicy.hpp" | |
30 #include "memory/generation.hpp" | |
31 #include "memory/sharedHeap.hpp" | |
32 | |
0 | 33 class SubTasksDone; |
34 | |
35 // A "GenCollectedHeap" is a SharedHeap that uses generational | |
36 // collection. It is represented with a sequence of Generation's. | |
37 class GenCollectedHeap : public SharedHeap { | |
38 friend class GenCollectorPolicy; | |
39 friend class Generation; | |
40 friend class DefNewGeneration; | |
41 friend class TenuredGeneration; | |
42 friend class ConcurrentMarkSweepGeneration; | |
43 friend class CMSCollector; | |
44 friend class GenMarkSweep; | |
45 friend class VM_GenCollectForAllocation; | |
46 friend class VM_GenCollectFull; | |
47 friend class VM_GenCollectFullConcurrent; | |
48 friend class VM_GC_HeapInspection; | |
49 friend class VM_HeapDumper; | |
50 friend class HeapInspection; | |
51 friend class GCCauseSetter; | |
52 friend class VMStructs; | |
53 public: | |
54 enum SomeConstants { | |
55 max_gens = 10 | |
56 }; | |
57 | |
58 friend class VM_PopulateDumpSharedSpace; | |
59 | |
60 protected: | |
61 // Fields: | |
62 static GenCollectedHeap* _gch; | |
63 | |
64 private: | |
65 int _n_gens; | |
66 Generation* _gens[max_gens]; | |
67 GenerationSpec** _gen_specs; | |
68 | |
69 // The generational collector policy. | |
70 GenCollectorPolicy* _gen_policy; | |
71 | |
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72 // Indicates that the most recent previous incremental collection failed. |
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73 // The flag is cleared when an action is taken that might clear the |
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74 // condition that caused that incremental collection to fail. |
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75 bool _incremental_collection_failed; |
0 | 76 |
77 // In support of ExplicitGCInvokesConcurrent functionality | |
78 unsigned int _full_collections_completed; | |
79 | |
80 // Data structure for claiming the (potentially) parallel tasks in | |
81 // (gen-specific) strong roots processing. | |
82 SubTasksDone* _gen_process_strong_tasks; | |
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83 SubTasksDone* gen_process_strong_tasks() { return _gen_process_strong_tasks; } |
0 | 84 |
85 // In block contents verification, the number of header words to skip | |
86 NOT_PRODUCT(static size_t _skip_header_HeapWords;) | |
87 | |
88 protected: | |
89 // Helper functions for allocation | |
90 HeapWord* attempt_allocation(size_t size, | |
91 bool is_tlab, | |
92 bool first_only); | |
93 | |
94 // Helper function for two callbacks below. | |
95 // Considers collection of the first max_level+1 generations. | |
96 void do_collection(bool full, | |
97 bool clear_all_soft_refs, | |
98 size_t size, | |
99 bool is_tlab, | |
100 int max_level); | |
101 | |
102 // Callback from VM_GenCollectForAllocation operation. | |
103 // This function does everything necessary/possible to satisfy an | |
104 // allocation request that failed in the youngest generation that should | |
105 // have handled it (including collection, expansion, etc.) | |
106 HeapWord* satisfy_failed_allocation(size_t size, bool is_tlab); | |
107 | |
108 // Callback from VM_GenCollectFull operation. | |
109 // Perform a full collection of the first max_level+1 generations. | |
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110 virtual void do_full_collection(bool clear_all_soft_refs); |
0 | 111 void do_full_collection(bool clear_all_soft_refs, int max_level); |
112 | |
113 // Does the "cause" of GC indicate that | |
114 // we absolutely __must__ clear soft refs? | |
115 bool must_clear_all_soft_refs(); | |
116 | |
117 public: | |
118 GenCollectedHeap(GenCollectorPolicy *policy); | |
119 | |
120 GCStats* gc_stats(int level) const; | |
121 | |
122 // Returns JNI_OK on success | |
123 virtual jint initialize(); | |
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124 char* allocate(size_t alignment, |
0 | 125 size_t* _total_reserved, int* _n_covered_regions, |
126 ReservedSpace* heap_rs); | |
127 | |
128 // Does operations required after initialization has been done. | |
129 void post_initialize(); | |
130 | |
131 // Initialize ("weak") refs processing support | |
132 virtual void ref_processing_init(); | |
133 | |
134 virtual CollectedHeap::Name kind() const { | |
135 return CollectedHeap::GenCollectedHeap; | |
136 } | |
137 | |
138 // The generational collector policy. | |
139 GenCollectorPolicy* gen_policy() const { return _gen_policy; } | |
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140 virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) gen_policy(); } |
0 | 141 |
142 // Adaptive size policy | |
143 virtual AdaptiveSizePolicy* size_policy() { | |
144 return gen_policy()->size_policy(); | |
145 } | |
146 | |
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147 // Return the (conservative) maximum heap alignment |
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148 static size_t conservative_max_heap_alignment() { |
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149 return Generation::GenGrain; |
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150 } |
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151 |
0 | 152 size_t capacity() const; |
153 size_t used() const; | |
154 | |
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155 // Save the "used_region" for generations level and lower. |
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156 void save_used_regions(int level); |
0 | 157 |
158 size_t max_capacity() const; | |
159 | |
160 HeapWord* mem_allocate(size_t size, | |
161 bool* gc_overhead_limit_was_exceeded); | |
162 | |
163 // We may support a shared contiguous allocation area, if the youngest | |
164 // generation does. | |
165 bool supports_inline_contig_alloc() const; | |
166 HeapWord** top_addr() const; | |
167 HeapWord** end_addr() const; | |
168 | |
169 // Does this heap support heap inspection? (+PrintClassHistogram) | |
170 virtual bool supports_heap_inspection() const { return true; } | |
171 | |
172 // Perform a full collection of the heap; intended for use in implementing | |
173 // "System.gc". This implies as full a collection as the CollectedHeap | |
174 // supports. Caller does not hold the Heap_lock on entry. | |
175 void collect(GCCause::Cause cause); | |
176 | |
177 // The same as above but assume that the caller holds the Heap_lock. | |
178 void collect_locked(GCCause::Cause cause); | |
179 | |
180 // Perform a full collection of the first max_level+1 generations. | |
181 // Mostly used for testing purposes. Caller does not hold the Heap_lock on entry. | |
182 void collect(GCCause::Cause cause, int max_level); | |
183 | |
4708 | 184 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
0 | 185 // The methods is_in(), is_in_closed_subset() and is_in_youngest() may |
186 // be expensive to compute in general, so, to prevent | |
187 // their inadvertent use in product jvm's, we restrict their use to | |
188 // assertion checking or verification only. | |
189 bool is_in(const void* p) const; | |
190 | |
191 // override | |
192 bool is_in_closed_subset(const void* p) const { | |
193 if (UseConcMarkSweepGC) { | |
194 return is_in_reserved(p); | |
195 } else { | |
196 return is_in(p); | |
197 } | |
198 } | |
199 | |
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200 // Returns true if the reference is to an object in the reserved space |
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201 // for the young generation. |
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202 // Assumes the the young gen address range is less than that of the old gen. |
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203 bool is_in_young(oop p); |
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204 |
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205 #ifdef ASSERT |
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206 virtual bool is_in_partial_collection(const void* p); |
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207 #endif |
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208 |
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209 virtual bool is_scavengable(const void* addr) { |
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210 return is_in_young((oop)addr); |
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211 } |
0 | 212 |
213 // Iteration functions. | |
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214 void oop_iterate(ExtendedOopClosure* cl); |
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215 void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
0 | 216 void object_iterate(ObjectClosure* cl); |
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217 void safe_object_iterate(ObjectClosure* cl); |
0 | 218 Space* space_containing(const void* addr) const; |
219 | |
220 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
221 // each address in the (reserved) heap is a member of exactly | |
222 // one block. The defining characteristic of a block is that it is | |
223 // possible to find its size, and thus to progress forward to the next | |
224 // block. (Blocks may be of different sizes.) Thus, blocks may | |
225 // represent Java objects, or they might be free blocks in a | |
226 // free-list-based heap (or subheap), as long as the two kinds are | |
227 // distinguishable and the size of each is determinable. | |
228 | |
229 // Returns the address of the start of the "block" that contains the | |
230 // address "addr". We say "blocks" instead of "object" since some heaps | |
231 // may not pack objects densely; a chunk may either be an object or a | |
232 // non-object. | |
233 virtual HeapWord* block_start(const void* addr) const; | |
234 | |
235 // Requires "addr" to be the start of a chunk, and returns its size. | |
236 // "addr + size" is required to be the start of a new chunk, or the end | |
237 // of the active area of the heap. Assumes (and verifies in non-product | |
238 // builds) that addr is in the allocated part of the heap and is | |
239 // the start of a chunk. | |
240 virtual size_t block_size(const HeapWord* addr) const; | |
241 | |
242 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
243 // the block is an object. Assumes (and verifies in non-product | |
244 // builds) that addr is in the allocated part of the heap and is | |
245 // the start of a chunk. | |
246 virtual bool block_is_obj(const HeapWord* addr) const; | |
247 | |
248 // Section on TLAB's. | |
249 virtual bool supports_tlab_allocation() const; | |
250 virtual size_t tlab_capacity(Thread* thr) const; | |
14310 | 251 virtual size_t tlab_used(Thread* thr) const; |
0 | 252 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; |
253 virtual HeapWord* allocate_new_tlab(size_t size); | |
254 | |
342
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255 // Can a compiler initialize a new object without store barriers? |
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256 // This permission only extends from the creation of a new object |
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257 // via a TLAB up to the first subsequent safepoint. |
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258 virtual bool can_elide_tlab_store_barriers() const { |
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259 return true; |
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260 } |
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261 |
1166 | 262 virtual bool card_mark_must_follow_store() const { |
263 return UseConcMarkSweepGC; | |
264 } | |
265 | |
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266 // We don't need barriers for stores to objects in the |
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267 // young gen and, a fortiori, for initializing stores to |
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268 // objects therein. This applies to {DefNew,ParNew}+{Tenured,CMS} |
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269 // only and may need to be re-examined in case other |
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270 // kinds of collectors are implemented in the future. |
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271 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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272 // We wanted to assert that:- |
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273 // assert(UseParNewGC || UseSerialGC || UseConcMarkSweepGC, |
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274 // "Check can_elide_initializing_store_barrier() for this collector"); |
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275 // but unfortunately the flag UseSerialGC need not necessarily always |
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276 // be set when DefNew+Tenured are being used. |
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277 return is_in_young(new_obj); |
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278 } |
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279 |
0 | 280 // The "requestor" generation is performing some garbage collection |
281 // action for which it would be useful to have scratch space. The | |
282 // requestor promises to allocate no more than "max_alloc_words" in any | |
283 // older generation (via promotion say.) Any blocks of space that can | |
284 // be provided are returned as a list of ScratchBlocks, sorted by | |
285 // decreasing size. | |
286 ScratchBlock* gather_scratch(Generation* requestor, size_t max_alloc_words); | |
263
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287 // Allow each generation to reset any scratch space that it has |
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288 // contributed as it needs. |
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289 void release_scratch(); |
0 | 290 |
291 // Ensure parsability: override | |
292 virtual void ensure_parsability(bool retire_tlabs); | |
293 | |
294 // Time in ms since the longest time a collector ran in | |
295 // in any generation. | |
296 virtual jlong millis_since_last_gc(); | |
297 | |
298 // Total number of full collections completed. | |
299 unsigned int total_full_collections_completed() { | |
300 assert(_full_collections_completed <= _total_full_collections, | |
301 "Can't complete more collections than were started"); | |
302 return _full_collections_completed; | |
303 } | |
304 | |
305 // Update above counter, as appropriate, at the end of a stop-world GC cycle | |
306 unsigned int update_full_collections_completed(); | |
307 // Update above counter, as appropriate, at the end of a concurrent GC cycle | |
308 unsigned int update_full_collections_completed(unsigned int count); | |
309 | |
310 // Update "time of last gc" for all constituent generations | |
311 // to "now". | |
312 void update_time_of_last_gc(jlong now) { | |
313 for (int i = 0; i < _n_gens; i++) { | |
314 _gens[i]->update_time_of_last_gc(now); | |
315 } | |
316 } | |
317 | |
318 // Update the gc statistics for each generation. | |
14309 | 319 // "level" is the level of the latest collection. |
0 | 320 void update_gc_stats(int current_level, bool full) { |
321 for (int i = 0; i < _n_gens; i++) { | |
322 _gens[i]->update_gc_stats(current_level, full); | |
323 } | |
324 } | |
325 | |
326 // Override. | |
327 bool no_gc_in_progress() { return !is_gc_active(); } | |
328 | |
329 // Override. | |
330 void prepare_for_verify(); | |
331 | |
332 // Override. | |
6008 | 333 void verify(bool silent, VerifyOption option); |
0 | 334 |
335 // Override. | |
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336 virtual void print_on(outputStream* st) const; |
0 | 337 virtual void print_gc_threads_on(outputStream* st) const; |
338 virtual void gc_threads_do(ThreadClosure* tc) const; | |
339 virtual void print_tracing_info() const; | |
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340 virtual void print_on_error(outputStream* st) const; |
0 | 341 |
342 // PrintGC, PrintGCDetails support | |
343 void print_heap_change(size_t prev_used) const; | |
344 | |
345 // The functions below are helper functions that a subclass of | |
346 // "CollectedHeap" can use in the implementation of its virtual | |
347 // functions. | |
348 | |
349 class GenClosure : public StackObj { | |
350 public: | |
351 virtual void do_generation(Generation* gen) = 0; | |
352 }; | |
353 | |
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354 // Apply "cl.do_generation" to all generations in the heap |
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355 // If "old_to_young" determines the order. |
0 | 356 void generation_iterate(GenClosure* cl, bool old_to_young); |
357 | |
358 void space_iterate(SpaceClosure* cl); | |
359 | |
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360 // Return "true" if all generations have reached the |
0 | 361 // maximal committed limit that they can reach, without a garbage |
362 // collection. | |
363 virtual bool is_maximal_no_gc() const; | |
364 | |
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365 // Return the generation before "gen". |
0 | 366 Generation* prev_gen(Generation* gen) const { |
367 int l = gen->level(); | |
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368 guarantee(l > 0, "Out of bounds"); |
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369 return _gens[l-1]; |
0 | 370 } |
371 | |
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372 // Return the generation after "gen". |
0 | 373 Generation* next_gen(Generation* gen) const { |
374 int l = gen->level() + 1; | |
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375 guarantee(l < _n_gens, "Out of bounds"); |
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376 return _gens[l]; |
0 | 377 } |
378 | |
379 Generation* get_gen(int i) const { | |
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380 guarantee(i >= 0 && i < _n_gens, "Out of bounds"); |
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381 return _gens[i]; |
0 | 382 } |
383 | |
384 int n_gens() const { | |
385 assert(_n_gens == gen_policy()->number_of_generations(), "Sanity"); | |
386 return _n_gens; | |
387 } | |
388 | |
389 // Convenience function to be used in situations where the heap type can be | |
390 // asserted to be this type. | |
391 static GenCollectedHeap* heap(); | |
392 | |
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393 void set_par_threads(uint t); |
0 | 394 |
395 // Invoke the "do_oop" method of one of the closures "not_older_gens" | |
396 // or "older_gens" on root locations for the generation at | |
397 // "level". (The "older_gens" closure is used for scanning references | |
398 // from older generations; "not_older_gens" is used everywhere else.) | |
399 // If "younger_gens_as_roots" is false, younger generations are | |
400 // not scanned as roots; in this case, the caller must be arranging to | |
401 // scan the younger generations itself. (For example, a generation might | |
402 // explicitly mark reachable objects in younger generations, to avoid | |
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403 // excess storage retention.) |
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404 // The "so" argument determines which of the roots |
0 | 405 // the closure is applied to: |
406 // "SO_None" does none; | |
407 // "SO_AllClasses" applies the closure to all entries in the SystemDictionary; | |
408 // "SO_SystemClasses" to all the "system" classes and loaders; | |
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409 // "SO_Strings" applies the closure to all entries in the StringTable. |
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410 void gen_process_strong_roots(int level, |
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411 bool younger_gens_as_roots, |
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412 // The remaining arguments are in an order |
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413 // consistent with SharedHeap::process_strong_roots: |
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414 bool activate_scope, |
0 | 415 SharedHeap::ScanningOption so, |
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416 OopsInGenClosure* not_older_gens, |
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417 OopsInGenClosure* older_gens, |
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418 KlassClosure* klass_closure); |
0 | 419 |
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420 // Apply "root_closure" to all the weak roots of the system. |
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421 // These include JNI weak roots, string table, |
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422 // and referents of reachable weak refs. |
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423 void gen_process_weak_roots(OopClosure* root_closure); |
0 | 424 |
425 // Set the saved marks of generations, if that makes sense. | |
426 // In particular, if any generation might iterate over the oops | |
427 // in other generations, it should call this method. | |
428 void save_marks(); | |
429 | |
430 // Apply "cur->do_oop" or "older->do_oop" to all the oops in objects | |
431 // allocated since the last call to save_marks in generations at or above | |
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432 // "level". The "cur" closure is |
0 | 433 // applied to references in the generation at "level", and the "older" |
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434 // closure to older generations. |
0 | 435 #define GCH_SINCE_SAVE_MARKS_ITERATE_DECL(OopClosureType, nv_suffix) \ |
436 void oop_since_save_marks_iterate(int level, \ | |
437 OopClosureType* cur, \ | |
438 OopClosureType* older); | |
439 | |
440 ALL_SINCE_SAVE_MARKS_CLOSURES(GCH_SINCE_SAVE_MARKS_ITERATE_DECL) | |
441 | |
442 #undef GCH_SINCE_SAVE_MARKS_ITERATE_DECL | |
443 | |
444 // Returns "true" iff no allocations have occurred in any generation at | |
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445 // "level" or above since the last |
0 | 446 // call to "save_marks". |
447 bool no_allocs_since_save_marks(int level); | |
448 | |
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449 // Returns true if an incremental collection is likely to fail. |
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450 // We optionally consult the young gen, if asked to do so; |
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451 // otherwise we base our answer on whether the previous incremental |
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452 // collection attempt failed with no corrective action as of yet. |
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453 bool incremental_collection_will_fail(bool consult_young) { |
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454 // Assumes a 2-generation system; the first disjunct remembers if an |
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455 // incremental collection failed, even when we thought (second disjunct) |
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456 // that it would not. |
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457 assert(heap()->collector_policy()->is_two_generation_policy(), |
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458 "the following definition may not be suitable for an n(>2)-generation system"); |
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459 return incremental_collection_failed() || |
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460 (consult_young && !get_gen(0)->collection_attempt_is_safe()); |
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461 } |
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462 |
0 | 463 // If a generation bails out of an incremental collection, |
464 // it sets this flag. | |
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465 bool incremental_collection_failed() const { |
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466 return _incremental_collection_failed; |
0 | 467 } |
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468 void set_incremental_collection_failed() { |
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469 _incremental_collection_failed = true; |
0 | 470 } |
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471 void clear_incremental_collection_failed() { |
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472 _incremental_collection_failed = false; |
0 | 473 } |
474 | |
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475 // Promotion of obj into gen failed. Try to promote obj to higher |
0 | 476 // gens in ascending order; return the new location of obj if successful. |
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477 // Otherwise, try expand-and-allocate for obj in both the young and old |
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478 // generation; return the new location of obj if successful. Otherwise, return NULL. |
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479 oop handle_failed_promotion(Generation* old_gen, |
0 | 480 oop obj, |
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481 size_t obj_size); |
0 | 482 |
483 private: | |
484 // Accessor for memory state verification support | |
485 NOT_PRODUCT( | |
486 static size_t skip_header_HeapWords() { return _skip_header_HeapWords; } | |
487 ) | |
488 | |
489 // Override | |
490 void check_for_non_bad_heap_word_value(HeapWord* addr, | |
491 size_t size) PRODUCT_RETURN; | |
492 | |
493 // For use by mark-sweep. As implemented, mark-sweep-compact is global | |
494 // in an essential way: compaction is performed across generations, by | |
495 // iterating over spaces. | |
496 void prepare_for_compaction(); | |
497 | |
498 // Perform a full collection of the first max_level+1 generations. | |
499 // This is the low level interface used by the public versions of | |
500 // collect() and collect_locked(). Caller holds the Heap_lock on entry. | |
501 void collect_locked(GCCause::Cause cause, int max_level); | |
502 | |
503 // Returns success or failure. | |
504 bool create_cms_collector(); | |
505 | |
506 // In support of ExplicitGCInvokesConcurrent functionality | |
507 bool should_do_concurrent_full_gc(GCCause::Cause cause); | |
508 void collect_mostly_concurrent(GCCause::Cause cause); | |
509 | |
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510 // Save the tops of the spaces in all generations |
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511 void record_gen_tops_before_GC() PRODUCT_RETURN; |
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512 |
0 | 513 protected: |
514 virtual void gc_prologue(bool full); | |
515 virtual void gc_epilogue(bool full); | |
516 }; | |
1972 | 517 |
518 #endif // SHARE_VM_MEMORY_GENCOLLECTEDHEAP_HPP |