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annotate src/share/vm/memory/genCollectedHeap.hpp @ 17721:d8a0bb6f62a5
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author | coffeys |
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date | Wed, 12 Mar 2014 18:53:34 +0000 |
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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 // Return an estimate of the maximum allocation that could be performed | |
170 // without triggering any collection activity. In a generational | |
171 // collector, for example, this is probably the largest allocation that | |
172 // could be supported in the youngest generation. It is "unsafe" because | |
173 // no locks are taken; the result should be treated as an approximation, | |
174 // not a guarantee. | |
175 size_t unsafe_max_alloc(); | |
176 | |
177 // Does this heap support heap inspection? (+PrintClassHistogram) | |
178 virtual bool supports_heap_inspection() const { return true; } | |
179 | |
180 // Perform a full collection of the heap; intended for use in implementing | |
181 // "System.gc". This implies as full a collection as the CollectedHeap | |
182 // supports. Caller does not hold the Heap_lock on entry. | |
183 void collect(GCCause::Cause cause); | |
184 | |
185 // The same as above but assume that the caller holds the Heap_lock. | |
186 void collect_locked(GCCause::Cause cause); | |
187 | |
188 // Perform a full collection of the first max_level+1 generations. | |
189 // Mostly used for testing purposes. Caller does not hold the Heap_lock on entry. | |
190 void collect(GCCause::Cause cause, int max_level); | |
191 | |
4708 | 192 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
0 | 193 // The methods is_in(), is_in_closed_subset() and is_in_youngest() may |
194 // be expensive to compute in general, so, to prevent | |
195 // their inadvertent use in product jvm's, we restrict their use to | |
196 // assertion checking or verification only. | |
197 bool is_in(const void* p) const; | |
198 | |
199 // override | |
200 bool is_in_closed_subset(const void* p) const { | |
201 if (UseConcMarkSweepGC) { | |
202 return is_in_reserved(p); | |
203 } else { | |
204 return is_in(p); | |
205 } | |
206 } | |
207 | |
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208 // Returns true if the reference is to an object in the reserved space |
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209 // for the young generation. |
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210 // Assumes the the young gen address range is less than that of the old gen. |
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211 bool is_in_young(oop p); |
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212 |
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213 #ifdef ASSERT |
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214 virtual bool is_in_partial_collection(const void* p); |
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215 #endif |
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216 |
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217 virtual bool is_scavengable(const void* addr) { |
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218 return is_in_young((oop)addr); |
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219 } |
0 | 220 |
221 // Iteration functions. | |
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222 void oop_iterate(ExtendedOopClosure* cl); |
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223 void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
0 | 224 void object_iterate(ObjectClosure* cl); |
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225 void safe_object_iterate(ObjectClosure* cl); |
0 | 226 Space* space_containing(const void* addr) const; |
227 | |
228 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
229 // each address in the (reserved) heap is a member of exactly | |
230 // one block. The defining characteristic of a block is that it is | |
231 // possible to find its size, and thus to progress forward to the next | |
232 // block. (Blocks may be of different sizes.) Thus, blocks may | |
233 // represent Java objects, or they might be free blocks in a | |
234 // free-list-based heap (or subheap), as long as the two kinds are | |
235 // distinguishable and the size of each is determinable. | |
236 | |
237 // Returns the address of the start of the "block" that contains the | |
238 // address "addr". We say "blocks" instead of "object" since some heaps | |
239 // may not pack objects densely; a chunk may either be an object or a | |
240 // non-object. | |
241 virtual HeapWord* block_start(const void* addr) const; | |
242 | |
243 // Requires "addr" to be the start of a chunk, and returns its size. | |
244 // "addr + size" is required to be the start of a new chunk, or the end | |
245 // of the active area of the heap. Assumes (and verifies in non-product | |
246 // builds) that addr is in the allocated part of the heap and is | |
247 // the start of a chunk. | |
248 virtual size_t block_size(const HeapWord* addr) const; | |
249 | |
250 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
251 // the block is an object. Assumes (and verifies in non-product | |
252 // builds) that addr is in the allocated part of the heap and is | |
253 // the start of a chunk. | |
254 virtual bool block_is_obj(const HeapWord* addr) const; | |
255 | |
256 // Section on TLAB's. | |
257 virtual bool supports_tlab_allocation() const; | |
258 virtual size_t tlab_capacity(Thread* thr) const; | |
259 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
260 virtual HeapWord* allocate_new_tlab(size_t size); | |
261 | |
342
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262 // Can a compiler initialize a new object without store barriers? |
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263 // This permission only extends from the creation of a new object |
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264 // via a TLAB up to the first subsequent safepoint. |
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265 virtual bool can_elide_tlab_store_barriers() const { |
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266 return true; |
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267 } |
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268 |
1166 | 269 virtual bool card_mark_must_follow_store() const { |
270 return UseConcMarkSweepGC; | |
271 } | |
272 | |
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273 // We don't need barriers for stores to objects in the |
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274 // young gen and, a fortiori, for initializing stores to |
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275 // objects therein. This applies to {DefNew,ParNew}+{Tenured,CMS} |
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276 // only and may need to be re-examined in case other |
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277 // kinds of collectors are implemented in the future. |
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278 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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279 // We wanted to assert that:- |
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280 // assert(UseParNewGC || UseSerialGC || UseConcMarkSweepGC, |
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281 // "Check can_elide_initializing_store_barrier() for this collector"); |
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282 // but unfortunately the flag UseSerialGC need not necessarily always |
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283 // be set when DefNew+Tenured are being used. |
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284 return is_in_young(new_obj); |
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285 } |
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286 |
0 | 287 // The "requestor" generation is performing some garbage collection |
288 // action for which it would be useful to have scratch space. The | |
289 // requestor promises to allocate no more than "max_alloc_words" in any | |
290 // older generation (via promotion say.) Any blocks of space that can | |
291 // be provided are returned as a list of ScratchBlocks, sorted by | |
292 // decreasing size. | |
293 ScratchBlock* gather_scratch(Generation* requestor, size_t max_alloc_words); | |
263
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294 // Allow each generation to reset any scratch space that it has |
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295 // contributed as it needs. |
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296 void release_scratch(); |
0 | 297 |
298 // Ensure parsability: override | |
299 virtual void ensure_parsability(bool retire_tlabs); | |
300 | |
301 // Time in ms since the longest time a collector ran in | |
302 // in any generation. | |
303 virtual jlong millis_since_last_gc(); | |
304 | |
305 // Total number of full collections completed. | |
306 unsigned int total_full_collections_completed() { | |
307 assert(_full_collections_completed <= _total_full_collections, | |
308 "Can't complete more collections than were started"); | |
309 return _full_collections_completed; | |
310 } | |
311 | |
312 // Update above counter, as appropriate, at the end of a stop-world GC cycle | |
313 unsigned int update_full_collections_completed(); | |
314 // Update above counter, as appropriate, at the end of a concurrent GC cycle | |
315 unsigned int update_full_collections_completed(unsigned int count); | |
316 | |
317 // Update "time of last gc" for all constituent generations | |
318 // to "now". | |
319 void update_time_of_last_gc(jlong now) { | |
320 for (int i = 0; i < _n_gens; i++) { | |
321 _gens[i]->update_time_of_last_gc(now); | |
322 } | |
323 } | |
324 | |
325 // Update the gc statistics for each generation. | |
326 // "level" is the level of the lastest collection | |
327 void update_gc_stats(int current_level, bool full) { | |
328 for (int i = 0; i < _n_gens; i++) { | |
329 _gens[i]->update_gc_stats(current_level, full); | |
330 } | |
331 } | |
332 | |
333 // Override. | |
334 bool no_gc_in_progress() { return !is_gc_active(); } | |
335 | |
336 // Override. | |
337 void prepare_for_verify(); | |
338 | |
339 // Override. | |
6008 | 340 void verify(bool silent, VerifyOption option); |
0 | 341 |
342 // Override. | |
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343 virtual void print_on(outputStream* st) const; |
0 | 344 virtual void print_gc_threads_on(outputStream* st) const; |
345 virtual void gc_threads_do(ThreadClosure* tc) const; | |
346 virtual void print_tracing_info() const; | |
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347 virtual void print_on_error(outputStream* st) const; |
0 | 348 |
349 // PrintGC, PrintGCDetails support | |
350 void print_heap_change(size_t prev_used) const; | |
351 | |
352 // The functions below are helper functions that a subclass of | |
353 // "CollectedHeap" can use in the implementation of its virtual | |
354 // functions. | |
355 | |
356 class GenClosure : public StackObj { | |
357 public: | |
358 virtual void do_generation(Generation* gen) = 0; | |
359 }; | |
360 | |
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361 // Apply "cl.do_generation" to all generations in the heap |
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362 // If "old_to_young" determines the order. |
0 | 363 void generation_iterate(GenClosure* cl, bool old_to_young); |
364 | |
365 void space_iterate(SpaceClosure* cl); | |
366 | |
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367 // Return "true" if all generations have reached the |
0 | 368 // maximal committed limit that they can reach, without a garbage |
369 // collection. | |
370 virtual bool is_maximal_no_gc() const; | |
371 | |
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372 // Return the generation before "gen". |
0 | 373 Generation* prev_gen(Generation* gen) const { |
374 int l = gen->level(); | |
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375 guarantee(l > 0, "Out of bounds"); |
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376 return _gens[l-1]; |
0 | 377 } |
378 | |
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379 // Return the generation after "gen". |
0 | 380 Generation* next_gen(Generation* gen) const { |
381 int l = gen->level() + 1; | |
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382 guarantee(l < _n_gens, "Out of bounds"); |
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383 return _gens[l]; |
0 | 384 } |
385 | |
386 Generation* get_gen(int i) const { | |
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387 guarantee(i >= 0 && i < _n_gens, "Out of bounds"); |
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388 return _gens[i]; |
0 | 389 } |
390 | |
391 int n_gens() const { | |
392 assert(_n_gens == gen_policy()->number_of_generations(), "Sanity"); | |
393 return _n_gens; | |
394 } | |
395 | |
396 // Convenience function to be used in situations where the heap type can be | |
397 // asserted to be this type. | |
398 static GenCollectedHeap* heap(); | |
399 | |
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400 void set_par_threads(uint t); |
0 | 401 |
402 // Invoke the "do_oop" method of one of the closures "not_older_gens" | |
403 // or "older_gens" on root locations for the generation at | |
404 // "level". (The "older_gens" closure is used for scanning references | |
405 // from older generations; "not_older_gens" is used everywhere else.) | |
406 // If "younger_gens_as_roots" is false, younger generations are | |
407 // not scanned as roots; in this case, the caller must be arranging to | |
408 // scan the younger generations itself. (For example, a generation might | |
409 // explicitly mark reachable objects in younger generations, to avoid | |
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410 // excess storage retention.) |
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411 // The "so" argument determines which of the roots |
0 | 412 // the closure is applied to: |
413 // "SO_None" does none; | |
414 // "SO_AllClasses" applies the closure to all entries in the SystemDictionary; | |
415 // "SO_SystemClasses" to all the "system" classes and loaders; | |
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416 // "SO_Strings" applies the closure to all entries in the StringTable. |
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417 void gen_process_strong_roots(int level, |
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418 bool younger_gens_as_roots, |
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419 // The remaining arguments are in an order |
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420 // consistent with SharedHeap::process_strong_roots: |
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421 bool activate_scope, |
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422 bool is_scavenging, |
0 | 423 SharedHeap::ScanningOption so, |
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424 OopsInGenClosure* not_older_gens, |
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425 bool do_code_roots, |
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426 OopsInGenClosure* older_gens, |
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427 KlassClosure* klass_closure); |
0 | 428 |
429 // Apply "blk" to all the weak roots of the system. These include | |
430 // JNI weak roots, the code cache, system dictionary, symbol table, | |
431 // string table, and referents of reachable weak refs. | |
432 void gen_process_weak_roots(OopClosure* root_closure, | |
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433 CodeBlobClosure* code_roots); |
0 | 434 |
435 // Set the saved marks of generations, if that makes sense. | |
436 // In particular, if any generation might iterate over the oops | |
437 // in other generations, it should call this method. | |
438 void save_marks(); | |
439 | |
440 // Apply "cur->do_oop" or "older->do_oop" to all the oops in objects | |
441 // allocated since the last call to save_marks in generations at or above | |
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442 // "level". The "cur" closure is |
0 | 443 // applied to references in the generation at "level", and the "older" |
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444 // closure to older generations. |
0 | 445 #define GCH_SINCE_SAVE_MARKS_ITERATE_DECL(OopClosureType, nv_suffix) \ |
446 void oop_since_save_marks_iterate(int level, \ | |
447 OopClosureType* cur, \ | |
448 OopClosureType* older); | |
449 | |
450 ALL_SINCE_SAVE_MARKS_CLOSURES(GCH_SINCE_SAVE_MARKS_ITERATE_DECL) | |
451 | |
452 #undef GCH_SINCE_SAVE_MARKS_ITERATE_DECL | |
453 | |
454 // Returns "true" iff no allocations have occurred in any generation at | |
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455 // "level" or above since the last |
0 | 456 // call to "save_marks". |
457 bool no_allocs_since_save_marks(int level); | |
458 | |
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459 // Returns true if an incremental collection is likely to fail. |
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460 // We optionally consult the young gen, if asked to do so; |
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461 // otherwise we base our answer on whether the previous incremental |
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462 // collection attempt failed with no corrective action as of yet. |
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463 bool incremental_collection_will_fail(bool consult_young) { |
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464 // Assumes a 2-generation system; the first disjunct remembers if an |
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465 // incremental collection failed, even when we thought (second disjunct) |
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466 // that it would not. |
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467 assert(heap()->collector_policy()->is_two_generation_policy(), |
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468 "the following definition may not be suitable for an n(>2)-generation system"); |
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469 return incremental_collection_failed() || |
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470 (consult_young && !get_gen(0)->collection_attempt_is_safe()); |
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471 } |
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472 |
0 | 473 // If a generation bails out of an incremental collection, |
474 // it sets this flag. | |
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475 bool incremental_collection_failed() const { |
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476 return _incremental_collection_failed; |
0 | 477 } |
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478 void set_incremental_collection_failed() { |
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479 _incremental_collection_failed = true; |
0 | 480 } |
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481 void clear_incremental_collection_failed() { |
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482 _incremental_collection_failed = false; |
0 | 483 } |
484 | |
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485 // Promotion of obj into gen failed. Try to promote obj to higher |
0 | 486 // gens in ascending order; return the new location of obj if successful. |
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487 // Otherwise, try expand-and-allocate for obj in both the young and old |
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488 // generation; return the new location of obj if successful. Otherwise, return NULL. |
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489 oop handle_failed_promotion(Generation* old_gen, |
0 | 490 oop obj, |
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491 size_t obj_size); |
0 | 492 |
493 private: | |
494 // Accessor for memory state verification support | |
495 NOT_PRODUCT( | |
496 static size_t skip_header_HeapWords() { return _skip_header_HeapWords; } | |
497 ) | |
498 | |
499 // Override | |
500 void check_for_non_bad_heap_word_value(HeapWord* addr, | |
501 size_t size) PRODUCT_RETURN; | |
502 | |
503 // For use by mark-sweep. As implemented, mark-sweep-compact is global | |
504 // in an essential way: compaction is performed across generations, by | |
505 // iterating over spaces. | |
506 void prepare_for_compaction(); | |
507 | |
508 // Perform a full collection of the first max_level+1 generations. | |
509 // This is the low level interface used by the public versions of | |
510 // collect() and collect_locked(). Caller holds the Heap_lock on entry. | |
511 void collect_locked(GCCause::Cause cause, int max_level); | |
512 | |
513 // Returns success or failure. | |
514 bool create_cms_collector(); | |
515 | |
516 // In support of ExplicitGCInvokesConcurrent functionality | |
517 bool should_do_concurrent_full_gc(GCCause::Cause cause); | |
518 void collect_mostly_concurrent(GCCause::Cause cause); | |
519 | |
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520 // Save the tops of the spaces in all generations |
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521 void record_gen_tops_before_GC() PRODUCT_RETURN; |
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522 |
0 | 523 protected: |
524 virtual void gc_prologue(bool full); | |
525 virtual void gc_epilogue(bool full); | |
526 }; | |
1972 | 527 |
528 #endif // SHARE_VM_MEMORY_GENCOLLECTEDHEAP_HPP |