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annotate src/share/vm/memory/genCollectedHeap.cpp @ 3678:9482471a7dfa
IdealGraphVisualizer: add a workaround to fix layouting of the QuickSearch combobar with the GTK look and feel
author | Peter Hofer <peter.hofer@jku.at> |
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date | Mon, 21 Nov 2011 15:54:32 +0100 |
parents | 2aa9ddbb9e60 |
children | 6747fd0512e0 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2011, 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 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "code/icBuffer.hpp" | |
30 #include "gc_implementation/shared/collectorCounters.hpp" | |
31 #include "gc_implementation/shared/vmGCOperations.hpp" | |
32 #include "gc_interface/collectedHeap.inline.hpp" | |
33 #include "memory/compactPermGen.hpp" | |
34 #include "memory/filemap.hpp" | |
35 #include "memory/gcLocker.inline.hpp" | |
36 #include "memory/genCollectedHeap.hpp" | |
37 #include "memory/genOopClosures.inline.hpp" | |
38 #include "memory/generation.inline.hpp" | |
39 #include "memory/generationSpec.hpp" | |
40 #include "memory/permGen.hpp" | |
41 #include "memory/resourceArea.hpp" | |
42 #include "memory/sharedHeap.hpp" | |
43 #include "memory/space.hpp" | |
44 #include "oops/oop.inline.hpp" | |
45 #include "oops/oop.inline2.hpp" | |
46 #include "runtime/aprofiler.hpp" | |
47 #include "runtime/biasedLocking.hpp" | |
48 #include "runtime/fprofiler.hpp" | |
49 #include "runtime/handles.hpp" | |
50 #include "runtime/handles.inline.hpp" | |
51 #include "runtime/java.hpp" | |
52 #include "runtime/vmThread.hpp" | |
53 #include "services/memoryService.hpp" | |
54 #include "utilities/vmError.hpp" | |
55 #include "utilities/workgroup.hpp" | |
56 #ifndef SERIALGC | |
57 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
58 #include "gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp" | |
59 #endif | |
0 | 60 |
61 GenCollectedHeap* GenCollectedHeap::_gch; | |
62 NOT_PRODUCT(size_t GenCollectedHeap::_skip_header_HeapWords = 0;) | |
63 | |
64 // The set of potentially parallel tasks in strong root scanning. | |
65 enum GCH_process_strong_roots_tasks { | |
66 // We probably want to parallelize both of these internally, but for now... | |
67 GCH_PS_younger_gens, | |
68 // Leave this one last. | |
69 GCH_PS_NumElements | |
70 }; | |
71 | |
72 GenCollectedHeap::GenCollectedHeap(GenCollectorPolicy *policy) : | |
73 SharedHeap(policy), | |
74 _gen_policy(policy), | |
75 _gen_process_strong_tasks(new SubTasksDone(GCH_PS_NumElements)), | |
76 _full_collections_completed(0) | |
77 { | |
78 if (_gen_process_strong_tasks == NULL || | |
79 !_gen_process_strong_tasks->valid()) { | |
80 vm_exit_during_initialization("Failed necessary allocation."); | |
81 } | |
82 assert(policy != NULL, "Sanity check"); | |
83 _preloading_shared_classes = false; | |
84 } | |
85 | |
86 jint GenCollectedHeap::initialize() { | |
1166 | 87 CollectedHeap::pre_initialize(); |
88 | |
0 | 89 int i; |
90 _n_gens = gen_policy()->number_of_generations(); | |
91 | |
92 // While there are no constraints in the GC code that HeapWordSize | |
93 // be any particular value, there are multiple other areas in the | |
94 // system which believe this to be true (e.g. oop->object_size in some | |
95 // cases incorrectly returns the size in wordSize units rather than | |
96 // HeapWordSize). | |
97 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
98 | |
99 // The heap must be at least as aligned as generations. | |
100 size_t alignment = Generation::GenGrain; | |
101 | |
102 _gen_specs = gen_policy()->generations(); | |
103 PermanentGenerationSpec *perm_gen_spec = | |
104 collector_policy()->permanent_generation(); | |
105 | |
106 // Make sure the sizes are all aligned. | |
107 for (i = 0; i < _n_gens; i++) { | |
108 _gen_specs[i]->align(alignment); | |
109 } | |
110 perm_gen_spec->align(alignment); | |
111 | |
112 // If we are dumping the heap, then allocate a wasted block of address | |
113 // space in order to push the heap to a lower address. This extra | |
114 // address range allows for other (or larger) libraries to be loaded | |
115 // without them occupying the space required for the shared spaces. | |
116 | |
117 if (DumpSharedSpaces) { | |
118 uintx reserved = 0; | |
119 uintx block_size = 64*1024*1024; | |
120 while (reserved < SharedDummyBlockSize) { | |
121 char* dummy = os::reserve_memory(block_size); | |
122 reserved += block_size; | |
123 } | |
124 } | |
125 | |
126 // Allocate space for the heap. | |
127 | |
128 char* heap_address; | |
129 size_t total_reserved = 0; | |
130 int n_covered_regions = 0; | |
131 ReservedSpace heap_rs(0); | |
132 | |
133 heap_address = allocate(alignment, perm_gen_spec, &total_reserved, | |
134 &n_covered_regions, &heap_rs); | |
135 | |
136 if (UseSharedSpaces) { | |
137 if (!heap_rs.is_reserved() || heap_address != heap_rs.base()) { | |
138 if (heap_rs.is_reserved()) { | |
139 heap_rs.release(); | |
140 } | |
141 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
142 mapinfo->fail_continue("Unable to reserve shared region."); | |
143 allocate(alignment, perm_gen_spec, &total_reserved, &n_covered_regions, | |
144 &heap_rs); | |
145 } | |
146 } | |
147 | |
148 if (!heap_rs.is_reserved()) { | |
149 vm_shutdown_during_initialization( | |
150 "Could not reserve enough space for object heap"); | |
151 return JNI_ENOMEM; | |
152 } | |
153 | |
154 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
155 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
156 | |
157 // It is important to do this in a way such that concurrent readers can't | |
158 // temporarily think somethings in the heap. (Seen this happen in asserts.) | |
159 _reserved.set_word_size(0); | |
160 _reserved.set_start((HeapWord*)heap_rs.base()); | |
161 size_t actual_heap_size = heap_rs.size() - perm_gen_spec->misc_data_size() | |
162 - perm_gen_spec->misc_code_size(); | |
163 _reserved.set_end((HeapWord*)(heap_rs.base() + actual_heap_size)); | |
164 | |
165 _rem_set = collector_policy()->create_rem_set(_reserved, n_covered_regions); | |
166 set_barrier_set(rem_set()->bs()); | |
1166 | 167 |
0 | 168 _gch = this; |
169 | |
170 for (i = 0; i < _n_gens; i++) { | |
171 ReservedSpace this_rs = heap_rs.first_part(_gen_specs[i]->max_size(), | |
172 UseSharedSpaces, UseSharedSpaces); | |
173 _gens[i] = _gen_specs[i]->init(this_rs, i, rem_set()); | |
174 heap_rs = heap_rs.last_part(_gen_specs[i]->max_size()); | |
175 } | |
176 _perm_gen = perm_gen_spec->init(heap_rs, PermSize, rem_set()); | |
177 | |
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178 clear_incremental_collection_failed(); |
0 | 179 |
180 #ifndef SERIALGC | |
181 // If we are running CMS, create the collector responsible | |
182 // for collecting the CMS generations. | |
183 if (collector_policy()->is_concurrent_mark_sweep_policy()) { | |
184 bool success = create_cms_collector(); | |
185 if (!success) return JNI_ENOMEM; | |
186 } | |
187 #endif // SERIALGC | |
188 | |
189 return JNI_OK; | |
190 } | |
191 | |
192 | |
193 char* GenCollectedHeap::allocate(size_t alignment, | |
194 PermanentGenerationSpec* perm_gen_spec, | |
195 size_t* _total_reserved, | |
196 int* _n_covered_regions, | |
197 ReservedSpace* heap_rs){ | |
198 const char overflow_msg[] = "The size of the object heap + VM data exceeds " | |
199 "the maximum representable size"; | |
200 | |
201 // Now figure out the total size. | |
202 size_t total_reserved = 0; | |
203 int n_covered_regions = 0; | |
204 const size_t pageSize = UseLargePages ? | |
205 os::large_page_size() : os::vm_page_size(); | |
206 | |
207 for (int i = 0; i < _n_gens; i++) { | |
208 total_reserved += _gen_specs[i]->max_size(); | |
209 if (total_reserved < _gen_specs[i]->max_size()) { | |
210 vm_exit_during_initialization(overflow_msg); | |
211 } | |
212 n_covered_regions += _gen_specs[i]->n_covered_regions(); | |
213 } | |
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214 assert(total_reserved % pageSize == 0, |
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215 err_msg("Gen size; total_reserved=" SIZE_FORMAT ", pageSize=" |
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216 SIZE_FORMAT, total_reserved, pageSize)); |
0 | 217 total_reserved += perm_gen_spec->max_size(); |
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218 assert(total_reserved % pageSize == 0, |
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219 err_msg("Perm size; total_reserved=" SIZE_FORMAT ", pageSize=" |
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220 SIZE_FORMAT ", perm gen max=" SIZE_FORMAT, total_reserved, |
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221 pageSize, perm_gen_spec->max_size())); |
0 | 222 |
223 if (total_reserved < perm_gen_spec->max_size()) { | |
224 vm_exit_during_initialization(overflow_msg); | |
225 } | |
226 n_covered_regions += perm_gen_spec->n_covered_regions(); | |
227 | |
228 // Add the size of the data area which shares the same reserved area | |
229 // as the heap, but which is not actually part of the heap. | |
230 size_t s = perm_gen_spec->misc_data_size() + perm_gen_spec->misc_code_size(); | |
231 | |
232 total_reserved += s; | |
233 if (total_reserved < s) { | |
234 vm_exit_during_initialization(overflow_msg); | |
235 } | |
236 | |
237 if (UseLargePages) { | |
238 assert(total_reserved != 0, "total_reserved cannot be 0"); | |
239 total_reserved = round_to(total_reserved, os::large_page_size()); | |
240 if (total_reserved < os::large_page_size()) { | |
241 vm_exit_during_initialization(overflow_msg); | |
242 } | |
243 } | |
244 | |
245 // Calculate the address at which the heap must reside in order for | |
246 // the shared data to be at the required address. | |
247 | |
248 char* heap_address; | |
249 if (UseSharedSpaces) { | |
250 | |
251 // Calculate the address of the first word beyond the heap. | |
252 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
253 int lr = CompactingPermGenGen::n_regions - 1; | |
254 size_t capacity = align_size_up(mapinfo->space_capacity(lr), alignment); | |
255 heap_address = mapinfo->region_base(lr) + capacity; | |
256 | |
257 // Calculate the address of the first word of the heap. | |
258 heap_address -= total_reserved; | |
259 } else { | |
260 heap_address = NULL; // any address will do. | |
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261 if (UseCompressedOops) { |
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262 heap_address = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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263 *_total_reserved = total_reserved; |
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264 *_n_covered_regions = n_covered_regions; |
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265 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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266 UseLargePages, heap_address); |
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267 |
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268 if (heap_address != NULL && !heap_rs->is_reserved()) { |
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269 // Failed to reserve at specified address - the requested memory |
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270 // region is taken already, for example, by 'java' launcher. |
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271 // Try again to reserver heap higher. |
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272 heap_address = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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273 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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274 UseLargePages, heap_address); |
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275 |
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276 if (heap_address != NULL && !heap_rs->is_reserved()) { |
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277 // Failed to reserve at specified address again - give up. |
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278 heap_address = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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279 assert(heap_address == NULL, ""); |
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280 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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281 UseLargePages, heap_address); |
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282 } |
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283 } |
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284 return heap_address; |
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285 } |
0 | 286 } |
287 | |
288 *_total_reserved = total_reserved; | |
289 *_n_covered_regions = n_covered_regions; | |
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290 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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291 UseLargePages, heap_address); |
0 | 292 |
293 return heap_address; | |
294 } | |
295 | |
296 | |
297 void GenCollectedHeap::post_initialize() { | |
298 SharedHeap::post_initialize(); | |
299 TwoGenerationCollectorPolicy *policy = | |
300 (TwoGenerationCollectorPolicy *)collector_policy(); | |
301 guarantee(policy->is_two_generation_policy(), "Illegal policy type"); | |
302 DefNewGeneration* def_new_gen = (DefNewGeneration*) get_gen(0); | |
303 assert(def_new_gen->kind() == Generation::DefNew || | |
304 def_new_gen->kind() == Generation::ParNew || | |
305 def_new_gen->kind() == Generation::ASParNew, | |
306 "Wrong generation kind"); | |
307 | |
308 Generation* old_gen = get_gen(1); | |
309 assert(old_gen->kind() == Generation::ConcurrentMarkSweep || | |
310 old_gen->kind() == Generation::ASConcurrentMarkSweep || | |
311 old_gen->kind() == Generation::MarkSweepCompact, | |
312 "Wrong generation kind"); | |
313 | |
314 policy->initialize_size_policy(def_new_gen->eden()->capacity(), | |
315 old_gen->capacity(), | |
316 def_new_gen->from()->capacity()); | |
317 policy->initialize_gc_policy_counters(); | |
318 } | |
319 | |
320 void GenCollectedHeap::ref_processing_init() { | |
321 SharedHeap::ref_processing_init(); | |
322 for (int i = 0; i < _n_gens; i++) { | |
323 _gens[i]->ref_processor_init(); | |
324 } | |
325 } | |
326 | |
327 size_t GenCollectedHeap::capacity() const { | |
328 size_t res = 0; | |
329 for (int i = 0; i < _n_gens; i++) { | |
330 res += _gens[i]->capacity(); | |
331 } | |
332 return res; | |
333 } | |
334 | |
335 size_t GenCollectedHeap::used() const { | |
336 size_t res = 0; | |
337 for (int i = 0; i < _n_gens; i++) { | |
338 res += _gens[i]->used(); | |
339 } | |
340 return res; | |
341 } | |
342 | |
343 // Save the "used_region" for generations level and lower, | |
344 // and, if perm is true, for perm gen. | |
345 void GenCollectedHeap::save_used_regions(int level, bool perm) { | |
346 assert(level < _n_gens, "Illegal level parameter"); | |
347 for (int i = level; i >= 0; i--) { | |
348 _gens[i]->save_used_region(); | |
349 } | |
350 if (perm) { | |
351 perm_gen()->save_used_region(); | |
352 } | |
353 } | |
354 | |
355 size_t GenCollectedHeap::max_capacity() const { | |
356 size_t res = 0; | |
357 for (int i = 0; i < _n_gens; i++) { | |
358 res += _gens[i]->max_capacity(); | |
359 } | |
360 return res; | |
361 } | |
362 | |
363 // Update the _full_collections_completed counter | |
364 // at the end of a stop-world full GC. | |
365 unsigned int GenCollectedHeap::update_full_collections_completed() { | |
366 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
367 assert(_full_collections_completed <= _total_full_collections, | |
368 "Can't complete more collections than were started"); | |
369 _full_collections_completed = _total_full_collections; | |
370 ml.notify_all(); | |
371 return _full_collections_completed; | |
372 } | |
373 | |
374 // Update the _full_collections_completed counter, as appropriate, | |
375 // at the end of a concurrent GC cycle. Note the conditional update | |
376 // below to allow this method to be called by a concurrent collector | |
377 // without synchronizing in any manner with the VM thread (which | |
378 // may already have initiated a STW full collection "concurrently"). | |
379 unsigned int GenCollectedHeap::update_full_collections_completed(unsigned int count) { | |
380 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
381 assert((_full_collections_completed <= _total_full_collections) && | |
382 (count <= _total_full_collections), | |
383 "Can't complete more collections than were started"); | |
384 if (count > _full_collections_completed) { | |
385 _full_collections_completed = count; | |
386 ml.notify_all(); | |
387 } | |
388 return _full_collections_completed; | |
389 } | |
390 | |
391 | |
392 #ifndef PRODUCT | |
393 // Override of memory state checking method in CollectedHeap: | |
394 // Some collectors (CMS for example) can't have badHeapWordVal written | |
395 // in the first two words of an object. (For instance , in the case of | |
396 // CMS these words hold state used to synchronize between certain | |
397 // (concurrent) GC steps and direct allocating mutators.) | |
398 // The skip_header_HeapWords() method below, allows us to skip | |
399 // over the requisite number of HeapWord's. Note that (for | |
400 // generational collectors) this means that those many words are | |
401 // skipped in each object, irrespective of the generation in which | |
402 // that object lives. The resultant loss of precision seems to be | |
403 // harmless and the pain of avoiding that imprecision appears somewhat | |
404 // higher than we are prepared to pay for such rudimentary debugging | |
405 // support. | |
406 void GenCollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, | |
407 size_t size) { | |
408 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
409 // We are asked to check a size in HeapWords, | |
410 // but the memory is mangled in juint words. | |
411 juint* start = (juint*) (addr + skip_header_HeapWords()); | |
412 juint* end = (juint*) (addr + size); | |
413 for (juint* slot = start; slot < end; slot += 1) { | |
414 assert(*slot == badHeapWordVal, | |
415 "Found non badHeapWordValue in pre-allocation check"); | |
416 } | |
417 } | |
418 } | |
419 #endif | |
420 | |
421 HeapWord* GenCollectedHeap::attempt_allocation(size_t size, | |
422 bool is_tlab, | |
423 bool first_only) { | |
424 HeapWord* res; | |
425 for (int i = 0; i < _n_gens; i++) { | |
426 if (_gens[i]->should_allocate(size, is_tlab)) { | |
427 res = _gens[i]->allocate(size, is_tlab); | |
428 if (res != NULL) return res; | |
429 else if (first_only) break; | |
430 } | |
431 } | |
432 // Otherwise... | |
433 return NULL; | |
434 } | |
435 | |
436 HeapWord* GenCollectedHeap::mem_allocate(size_t size, | |
437 bool is_large_noref, | |
438 bool is_tlab, | |
439 bool* gc_overhead_limit_was_exceeded) { | |
440 return collector_policy()->mem_allocate_work(size, | |
441 is_tlab, | |
442 gc_overhead_limit_was_exceeded); | |
443 } | |
444 | |
445 bool GenCollectedHeap::must_clear_all_soft_refs() { | |
446 return _gc_cause == GCCause::_last_ditch_collection; | |
447 } | |
448 | |
449 bool GenCollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { | |
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450 return UseConcMarkSweepGC && |
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451 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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452 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
0 | 453 } |
454 | |
455 void GenCollectedHeap::do_collection(bool full, | |
456 bool clear_all_soft_refs, | |
457 size_t size, | |
458 bool is_tlab, | |
459 int max_level) { | |
460 bool prepared_for_verification = false; | |
461 ResourceMark rm; | |
462 DEBUG_ONLY(Thread* my_thread = Thread::current();) | |
463 | |
464 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
465 assert(my_thread->is_VM_thread() || | |
466 my_thread->is_ConcurrentGC_thread(), | |
467 "incorrect thread type capability"); | |
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468 assert(Heap_lock->is_locked(), |
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469 "the requesting thread should have the Heap_lock"); |
0 | 470 guarantee(!is_gc_active(), "collection is not reentrant"); |
471 assert(max_level < n_gens(), "sanity check"); | |
472 | |
473 if (GC_locker::check_active_before_gc()) { | |
474 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
475 } | |
476 | |
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477 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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478 collector_policy()->should_clear_all_soft_refs(); |
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479 |
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480 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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481 |
0 | 482 const size_t perm_prev_used = perm_gen()->used(); |
483 | |
484 if (PrintHeapAtGC) { | |
485 Universe::print_heap_before_gc(); | |
486 if (Verbose) { | |
487 gclog_or_tty->print_cr("GC Cause: %s", GCCause::to_string(gc_cause())); | |
488 } | |
489 } | |
490 | |
491 { | |
492 FlagSetting fl(_is_gc_active, true); | |
493 | |
494 bool complete = full && (max_level == (n_gens()-1)); | |
495 const char* gc_cause_str = "GC "; | |
496 if (complete) { | |
497 GCCause::Cause cause = gc_cause(); | |
498 if (cause == GCCause::_java_lang_system_gc) { | |
499 gc_cause_str = "Full GC (System) "; | |
500 } else { | |
501 gc_cause_str = "Full GC "; | |
502 } | |
503 } | |
504 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
505 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
506 TraceTime t(gc_cause_str, PrintGCDetails, false, gclog_or_tty); | |
507 | |
508 gc_prologue(complete); | |
509 increment_total_collections(complete); | |
510 | |
511 size_t gch_prev_used = used(); | |
512 | |
513 int starting_level = 0; | |
514 if (full) { | |
515 // Search for the oldest generation which will collect all younger | |
516 // generations, and start collection loop there. | |
517 for (int i = max_level; i >= 0; i--) { | |
518 if (_gens[i]->full_collects_younger_generations()) { | |
519 starting_level = i; | |
520 break; | |
521 } | |
522 } | |
523 } | |
524 | |
525 bool must_restore_marks_for_biased_locking = false; | |
526 | |
527 int max_level_collected = starting_level; | |
528 for (int i = starting_level; i <= max_level; i++) { | |
529 if (_gens[i]->should_collect(full, size, is_tlab)) { | |
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530 if (i == n_gens() - 1) { // a major collection is to happen |
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531 if (!complete) { |
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532 // The full_collections increment was missed above. |
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533 increment_total_full_collections(); |
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534 } |
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535 pre_full_gc_dump(); // do any pre full gc dumps |
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536 } |
0 | 537 // Timer for individual generations. Last argument is false: no CR |
538 TraceTime t1(_gens[i]->short_name(), PrintGCDetails, false, gclog_or_tty); | |
539 TraceCollectorStats tcs(_gens[i]->counters()); | |
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540 TraceMemoryManagerStats tmms(_gens[i]->kind(),gc_cause()); |
0 | 541 |
542 size_t prev_used = _gens[i]->used(); | |
543 _gens[i]->stat_record()->invocations++; | |
544 _gens[i]->stat_record()->accumulated_time.start(); | |
545 | |
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546 // Must be done anew before each collection because |
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547 // a previous collection will do mangling and will |
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548 // change top of some spaces. |
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549 record_gen_tops_before_GC(); |
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550 |
0 | 551 if (PrintGC && Verbose) { |
552 gclog_or_tty->print("level=%d invoke=%d size=" SIZE_FORMAT, | |
553 i, | |
554 _gens[i]->stat_record()->invocations, | |
555 size*HeapWordSize); | |
556 } | |
557 | |
558 if (VerifyBeforeGC && i >= VerifyGCLevel && | |
559 total_collections() >= VerifyGCStartAt) { | |
560 HandleMark hm; // Discard invalid handles created during verification | |
561 if (!prepared_for_verification) { | |
562 prepare_for_verify(); | |
563 prepared_for_verification = true; | |
564 } | |
565 gclog_or_tty->print(" VerifyBeforeGC:"); | |
566 Universe::verify(true); | |
567 } | |
568 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
569 | |
570 if (!must_restore_marks_for_biased_locking && | |
571 _gens[i]->performs_in_place_marking()) { | |
572 // We perform this mark word preservation work lazily | |
573 // because it's only at this point that we know whether we | |
574 // absolutely have to do it; we want to avoid doing it for | |
575 // scavenge-only collections where it's unnecessary | |
576 must_restore_marks_for_biased_locking = true; | |
577 BiasedLocking::preserve_marks(); | |
578 } | |
579 | |
580 // Do collection work | |
581 { | |
582 // Note on ref discovery: For what appear to be historical reasons, | |
583 // GCH enables and disabled (by enqueing) refs discovery. | |
584 // In the future this should be moved into the generation's | |
585 // collect method so that ref discovery and enqueueing concerns | |
586 // are local to a generation. The collect method could return | |
587 // an appropriate indication in the case that notification on | |
588 // the ref lock was needed. This will make the treatment of | |
589 // weak refs more uniform (and indeed remove such concerns | |
590 // from GCH). XXX | |
591 | |
592 HandleMark hm; // Discard invalid handles created during gc | |
593 save_marks(); // save marks for all gens | |
594 // We want to discover references, but not process them yet. | |
595 // This mode is disabled in process_discovered_references if the | |
596 // generation does some collection work, or in | |
597 // enqueue_discovered_references if the generation returns | |
598 // without doing any work. | |
599 ReferenceProcessor* rp = _gens[i]->ref_processor(); | |
600 // If the discovery of ("weak") refs in this generation is | |
601 // atomic wrt other collectors in this configuration, we | |
602 // are guaranteed to have empty discovered ref lists. | |
603 if (rp->discovery_is_atomic()) { | |
604 rp->verify_no_references_recorded(); | |
605 rp->enable_discovery(); | |
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606 rp->setup_policy(do_clear_all_soft_refs); |
0 | 607 } else { |
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608 // collect() below will enable discovery as appropriate |
0 | 609 } |
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610 _gens[i]->collect(full, do_clear_all_soft_refs, size, is_tlab); |
0 | 611 if (!rp->enqueuing_is_done()) { |
612 rp->enqueue_discovered_references(); | |
613 } else { | |
614 rp->set_enqueuing_is_done(false); | |
615 } | |
616 rp->verify_no_references_recorded(); | |
617 } | |
618 max_level_collected = i; | |
619 | |
620 // Determine if allocation request was met. | |
621 if (size > 0) { | |
622 if (!is_tlab || _gens[i]->supports_tlab_allocation()) { | |
623 if (size*HeapWordSize <= _gens[i]->unsafe_max_alloc_nogc()) { | |
624 size = 0; | |
625 } | |
626 } | |
627 } | |
628 | |
629 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
630 | |
631 _gens[i]->stat_record()->accumulated_time.stop(); | |
632 | |
633 update_gc_stats(i, full); | |
634 | |
635 if (VerifyAfterGC && i >= VerifyGCLevel && | |
636 total_collections() >= VerifyGCStartAt) { | |
637 HandleMark hm; // Discard invalid handles created during verification | |
638 gclog_or_tty->print(" VerifyAfterGC:"); | |
639 Universe::verify(false); | |
640 } | |
641 | |
642 if (PrintGCDetails) { | |
643 gclog_or_tty->print(":"); | |
644 _gens[i]->print_heap_change(prev_used); | |
645 } | |
646 } | |
647 } | |
648 | |
649 // Update "complete" boolean wrt what actually transpired -- | |
650 // for instance, a promotion failure could have led to | |
651 // a whole heap collection. | |
652 complete = complete || (max_level_collected == n_gens() - 1); | |
653 | |
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654 if (complete) { // We did a "major" collection |
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655 post_full_gc_dump(); // do any post full gc dumps |
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656 } |
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657 |
0 | 658 if (PrintGCDetails) { |
659 print_heap_change(gch_prev_used); | |
660 | |
661 // Print perm gen info for full GC with PrintGCDetails flag. | |
662 if (complete) { | |
663 print_perm_heap_change(perm_prev_used); | |
664 } | |
665 } | |
666 | |
667 for (int j = max_level_collected; j >= 0; j -= 1) { | |
668 // Adjust generation sizes. | |
669 _gens[j]->compute_new_size(); | |
670 } | |
671 | |
672 if (complete) { | |
673 // Ask the permanent generation to adjust size for full collections | |
674 perm()->compute_new_size(); | |
675 update_full_collections_completed(); | |
676 } | |
677 | |
678 // Track memory usage and detect low memory after GC finishes | |
679 MemoryService::track_memory_usage(); | |
680 | |
681 gc_epilogue(complete); | |
682 | |
683 if (must_restore_marks_for_biased_locking) { | |
684 BiasedLocking::restore_marks(); | |
685 } | |
686 } | |
687 | |
688 AdaptiveSizePolicy* sp = gen_policy()->size_policy(); | |
689 AdaptiveSizePolicyOutput(sp, total_collections()); | |
690 | |
691 if (PrintHeapAtGC) { | |
692 Universe::print_heap_after_gc(); | |
693 } | |
694 | |
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695 #ifdef TRACESPINNING |
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696 ParallelTaskTerminator::print_termination_counts(); |
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697 #endif |
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698 |
0 | 699 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
700 tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); | |
701 vm_exit(-1); | |
702 } | |
703 } | |
704 | |
705 HeapWord* GenCollectedHeap::satisfy_failed_allocation(size_t size, bool is_tlab) { | |
706 return collector_policy()->satisfy_failed_allocation(size, is_tlab); | |
707 } | |
708 | |
709 void GenCollectedHeap::set_par_threads(int t) { | |
710 SharedHeap::set_par_threads(t); | |
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711 _gen_process_strong_tasks->set_n_threads(t); |
0 | 712 } |
713 | |
714 void GenCollectedHeap:: | |
715 gen_process_strong_roots(int level, | |
716 bool younger_gens_as_roots, | |
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717 bool activate_scope, |
0 | 718 bool collecting_perm_gen, |
719 SharedHeap::ScanningOption so, | |
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720 OopsInGenClosure* not_older_gens, |
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721 bool do_code_roots, |
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722 OopsInGenClosure* older_gens) { |
0 | 723 // General strong roots. |
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724 |
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725 if (!do_code_roots) { |
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726 SharedHeap::process_strong_roots(activate_scope, collecting_perm_gen, so, |
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727 not_older_gens, NULL, older_gens); |
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728 } else { |
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729 bool do_code_marking = (activate_scope || nmethod::oops_do_marking_is_active()); |
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730 CodeBlobToOopClosure code_roots(not_older_gens, /*do_marking=*/ do_code_marking); |
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731 SharedHeap::process_strong_roots(activate_scope, collecting_perm_gen, so, |
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732 not_older_gens, &code_roots, older_gens); |
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733 } |
0 | 734 |
735 if (younger_gens_as_roots) { | |
736 if (!_gen_process_strong_tasks->is_task_claimed(GCH_PS_younger_gens)) { | |
737 for (int i = 0; i < level; i++) { | |
738 not_older_gens->set_generation(_gens[i]); | |
739 _gens[i]->oop_iterate(not_older_gens); | |
740 } | |
741 not_older_gens->reset_generation(); | |
742 } | |
743 } | |
744 // When collection is parallel, all threads get to cooperate to do | |
745 // older-gen scanning. | |
746 for (int i = level+1; i < _n_gens; i++) { | |
747 older_gens->set_generation(_gens[i]); | |
748 rem_set()->younger_refs_iterate(_gens[i], older_gens); | |
749 older_gens->reset_generation(); | |
750 } | |
751 | |
752 _gen_process_strong_tasks->all_tasks_completed(); | |
753 } | |
754 | |
755 void GenCollectedHeap::gen_process_weak_roots(OopClosure* root_closure, | |
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756 CodeBlobClosure* code_roots, |
0 | 757 OopClosure* non_root_closure) { |
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758 SharedHeap::process_weak_roots(root_closure, code_roots, non_root_closure); |
0 | 759 // "Local" "weak" refs |
760 for (int i = 0; i < _n_gens; i++) { | |
761 _gens[i]->ref_processor()->weak_oops_do(root_closure); | |
762 } | |
763 } | |
764 | |
765 #define GCH_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
766 void GenCollectedHeap:: \ | |
767 oop_since_save_marks_iterate(int level, \ | |
768 OopClosureType* cur, \ | |
769 OopClosureType* older) { \ | |
770 _gens[level]->oop_since_save_marks_iterate##nv_suffix(cur); \ | |
771 for (int i = level+1; i < n_gens(); i++) { \ | |
772 _gens[i]->oop_since_save_marks_iterate##nv_suffix(older); \ | |
773 } \ | |
774 perm_gen()->oop_since_save_marks_iterate##nv_suffix(older); \ | |
775 } | |
776 | |
777 ALL_SINCE_SAVE_MARKS_CLOSURES(GCH_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
778 | |
779 #undef GCH_SINCE_SAVE_MARKS_ITERATE_DEFN | |
780 | |
781 bool GenCollectedHeap::no_allocs_since_save_marks(int level) { | |
782 for (int i = level; i < _n_gens; i++) { | |
783 if (!_gens[i]->no_allocs_since_save_marks()) return false; | |
784 } | |
785 return perm_gen()->no_allocs_since_save_marks(); | |
786 } | |
787 | |
788 bool GenCollectedHeap::supports_inline_contig_alloc() const { | |
789 return _gens[0]->supports_inline_contig_alloc(); | |
790 } | |
791 | |
792 HeapWord** GenCollectedHeap::top_addr() const { | |
793 return _gens[0]->top_addr(); | |
794 } | |
795 | |
796 HeapWord** GenCollectedHeap::end_addr() const { | |
797 return _gens[0]->end_addr(); | |
798 } | |
799 | |
800 size_t GenCollectedHeap::unsafe_max_alloc() { | |
801 return _gens[0]->unsafe_max_alloc_nogc(); | |
802 } | |
803 | |
804 // public collection interfaces | |
805 | |
806 void GenCollectedHeap::collect(GCCause::Cause cause) { | |
807 if (should_do_concurrent_full_gc(cause)) { | |
808 #ifndef SERIALGC | |
809 // mostly concurrent full collection | |
810 collect_mostly_concurrent(cause); | |
811 #else // SERIALGC | |
812 ShouldNotReachHere(); | |
813 #endif // SERIALGC | |
814 } else { | |
815 #ifdef ASSERT | |
816 if (cause == GCCause::_scavenge_alot) { | |
817 // minor collection only | |
818 collect(cause, 0); | |
819 } else { | |
820 // Stop-the-world full collection | |
821 collect(cause, n_gens() - 1); | |
822 } | |
823 #else | |
824 // Stop-the-world full collection | |
825 collect(cause, n_gens() - 1); | |
826 #endif | |
827 } | |
828 } | |
829 | |
830 void GenCollectedHeap::collect(GCCause::Cause cause, int max_level) { | |
831 // The caller doesn't have the Heap_lock | |
832 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
833 MutexLocker ml(Heap_lock); | |
834 collect_locked(cause, max_level); | |
835 } | |
836 | |
837 // This interface assumes that it's being called by the | |
838 // vm thread. It collects the heap assuming that the | |
839 // heap lock is already held and that we are executing in | |
840 // the context of the vm thread. | |
841 void GenCollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
842 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
843 assert(Heap_lock->is_locked(), "Precondition#2"); | |
844 GCCauseSetter gcs(this, cause); | |
845 switch (cause) { | |
846 case GCCause::_heap_inspection: | |
847 case GCCause::_heap_dump: { | |
848 HandleMark hm; | |
849 do_full_collection(false, // don't clear all soft refs | |
850 n_gens() - 1); | |
851 break; | |
852 } | |
853 default: // XXX FIX ME | |
854 ShouldNotReachHere(); // Unexpected use of this function | |
855 } | |
856 } | |
857 | |
858 void GenCollectedHeap::collect_locked(GCCause::Cause cause) { | |
859 // The caller has the Heap_lock | |
860 assert(Heap_lock->owned_by_self(), "this thread should own the Heap_lock"); | |
861 collect_locked(cause, n_gens() - 1); | |
862 } | |
863 | |
864 // this is the private collection interface | |
865 // The Heap_lock is expected to be held on entry. | |
866 | |
867 void GenCollectedHeap::collect_locked(GCCause::Cause cause, int max_level) { | |
868 if (_preloading_shared_classes) { | |
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869 report_out_of_shared_space(SharedPermGen); |
0 | 870 } |
871 // Read the GC count while holding the Heap_lock | |
872 unsigned int gc_count_before = total_collections(); | |
873 unsigned int full_gc_count_before = total_full_collections(); | |
874 { | |
875 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
876 VM_GenCollectFull op(gc_count_before, full_gc_count_before, | |
877 cause, max_level); | |
878 VMThread::execute(&op); | |
879 } | |
880 } | |
881 | |
882 #ifndef SERIALGC | |
883 bool GenCollectedHeap::create_cms_collector() { | |
884 | |
885 assert(((_gens[1]->kind() == Generation::ConcurrentMarkSweep) || | |
886 (_gens[1]->kind() == Generation::ASConcurrentMarkSweep)) && | |
887 _perm_gen->as_gen()->kind() == Generation::ConcurrentMarkSweep, | |
888 "Unexpected generation kinds"); | |
889 // Skip two header words in the block content verification | |
890 NOT_PRODUCT(_skip_header_HeapWords = CMSCollector::skip_header_HeapWords();) | |
891 CMSCollector* collector = new CMSCollector( | |
892 (ConcurrentMarkSweepGeneration*)_gens[1], | |
893 (ConcurrentMarkSweepGeneration*)_perm_gen->as_gen(), | |
894 _rem_set->as_CardTableRS(), | |
895 (ConcurrentMarkSweepPolicy*) collector_policy()); | |
896 | |
897 if (collector == NULL || !collector->completed_initialization()) { | |
898 if (collector) { | |
899 delete collector; // Be nice in embedded situation | |
900 } | |
901 vm_shutdown_during_initialization("Could not create CMS collector"); | |
902 return false; | |
903 } | |
904 return true; // success | |
905 } | |
906 | |
907 void GenCollectedHeap::collect_mostly_concurrent(GCCause::Cause cause) { | |
908 assert(!Heap_lock->owned_by_self(), "Should not own Heap_lock"); | |
909 | |
910 MutexLocker ml(Heap_lock); | |
911 // Read the GC counts while holding the Heap_lock | |
912 unsigned int full_gc_count_before = total_full_collections(); | |
913 unsigned int gc_count_before = total_collections(); | |
914 { | |
915 MutexUnlocker mu(Heap_lock); | |
916 VM_GenCollectFullConcurrent op(gc_count_before, full_gc_count_before, cause); | |
917 VMThread::execute(&op); | |
918 } | |
919 } | |
920 #endif // SERIALGC | |
921 | |
922 | |
923 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs, | |
924 int max_level) { | |
925 int local_max_level; | |
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926 if (!incremental_collection_will_fail(false /* don't consult_young */) && |
0 | 927 gc_cause() == GCCause::_gc_locker) { |
928 local_max_level = 0; | |
929 } else { | |
930 local_max_level = max_level; | |
931 } | |
932 | |
933 do_collection(true /* full */, | |
934 clear_all_soft_refs /* clear_all_soft_refs */, | |
935 0 /* size */, | |
936 false /* is_tlab */, | |
937 local_max_level /* max_level */); | |
938 // Hack XXX FIX ME !!! | |
939 // A scavenge may not have been attempted, or may have | |
940 // been attempted and failed, because the old gen was too full | |
941 if (local_max_level == 0 && gc_cause() == GCCause::_gc_locker && | |
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942 incremental_collection_will_fail(false /* don't consult_young */)) { |
0 | 943 if (PrintGCDetails) { |
944 gclog_or_tty->print_cr("GC locker: Trying a full collection " | |
945 "because scavenge failed"); | |
946 } | |
947 // This time allow the old gen to be collected as well | |
948 do_collection(true /* full */, | |
949 clear_all_soft_refs /* clear_all_soft_refs */, | |
950 0 /* size */, | |
951 false /* is_tlab */, | |
952 n_gens() - 1 /* max_level */); | |
953 } | |
954 } | |
955 | |
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956 bool GenCollectedHeap::is_in_young(oop p) { |
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957 bool result = ((HeapWord*)p) < _gens[_n_gens - 1]->reserved().start(); |
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958 assert(result == _gens[0]->is_in_reserved(p), |
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959 err_msg("incorrect test - result=%d, p=" PTR_FORMAT, result, (void*)p)); |
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960 return result; |
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961 } |
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962 |
0 | 963 // Returns "TRUE" iff "p" points into the allocated area of the heap. |
964 bool GenCollectedHeap::is_in(const void* p) const { | |
965 #ifndef ASSERT | |
966 guarantee(VerifyBeforeGC || | |
967 VerifyDuringGC || | |
968 VerifyBeforeExit || | |
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969 PrintAssembly || |
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970 tty->count() != 0 || // already printing |
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971 VerifyAfterGC || |
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972 VMError::fatal_error_in_progress(), "too expensive"); |
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973 |
0 | 974 #endif |
975 // This might be sped up with a cache of the last generation that | |
976 // answered yes. | |
977 for (int i = 0; i < _n_gens; i++) { | |
978 if (_gens[i]->is_in(p)) return true; | |
979 } | |
980 if (_perm_gen->as_gen()->is_in(p)) return true; | |
981 // Otherwise... | |
982 return false; | |
983 } | |
984 | |
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985 #ifdef ASSERT |
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986 // Don't implement this by using is_in_young(). This method is used |
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987 // in some cases to check that is_in_young() is correct. |
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988 bool GenCollectedHeap::is_in_partial_collection(const void* p) { |
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989 assert(is_in_reserved(p) || p == NULL, |
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990 "Does not work if address is non-null and outside of the heap"); |
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991 // The order of the generations is young (low addr), old, perm (high addr) |
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992 return p < _gens[_n_gens - 2]->reserved().end() && p != NULL; |
0 | 993 } |
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994 #endif |
0 | 995 |
996 void GenCollectedHeap::oop_iterate(OopClosure* cl) { | |
997 for (int i = 0; i < _n_gens; i++) { | |
998 _gens[i]->oop_iterate(cl); | |
999 } | |
1000 } | |
1001 | |
1002 void GenCollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl) { | |
1003 for (int i = 0; i < _n_gens; i++) { | |
1004 _gens[i]->oop_iterate(mr, cl); | |
1005 } | |
1006 } | |
1007 | |
1008 void GenCollectedHeap::object_iterate(ObjectClosure* cl) { | |
1009 for (int i = 0; i < _n_gens; i++) { | |
1010 _gens[i]->object_iterate(cl); | |
1011 } | |
1012 perm_gen()->object_iterate(cl); | |
1013 } | |
1014 | |
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1015 void GenCollectedHeap::safe_object_iterate(ObjectClosure* cl) { |
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1016 for (int i = 0; i < _n_gens; i++) { |
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1017 _gens[i]->safe_object_iterate(cl); |
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1018 } |
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1019 perm_gen()->safe_object_iterate(cl); |
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1020 } |
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1021 |
0 | 1022 void GenCollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { |
1023 for (int i = 0; i < _n_gens; i++) { | |
1024 _gens[i]->object_iterate_since_last_GC(cl); | |
1025 } | |
1026 } | |
1027 | |
1028 Space* GenCollectedHeap::space_containing(const void* addr) const { | |
1029 for (int i = 0; i < _n_gens; i++) { | |
1030 Space* res = _gens[i]->space_containing(addr); | |
1031 if (res != NULL) return res; | |
1032 } | |
1033 Space* res = perm_gen()->space_containing(addr); | |
1034 if (res != NULL) return res; | |
1035 // Otherwise... | |
1036 assert(false, "Could not find containing space"); | |
1037 return NULL; | |
1038 } | |
1039 | |
1040 | |
1041 HeapWord* GenCollectedHeap::block_start(const void* addr) const { | |
1042 assert(is_in_reserved(addr), "block_start of address outside of heap"); | |
1043 for (int i = 0; i < _n_gens; i++) { | |
1044 if (_gens[i]->is_in_reserved(addr)) { | |
1045 assert(_gens[i]->is_in(addr), | |
1046 "addr should be in allocated part of generation"); | |
1047 return _gens[i]->block_start(addr); | |
1048 } | |
1049 } | |
1050 if (perm_gen()->is_in_reserved(addr)) { | |
1051 assert(perm_gen()->is_in(addr), | |
1052 "addr should be in allocated part of perm gen"); | |
1053 return perm_gen()->block_start(addr); | |
1054 } | |
1055 assert(false, "Some generation should contain the address"); | |
1056 return NULL; | |
1057 } | |
1058 | |
1059 size_t GenCollectedHeap::block_size(const HeapWord* addr) const { | |
1060 assert(is_in_reserved(addr), "block_size of address outside of heap"); | |
1061 for (int i = 0; i < _n_gens; i++) { | |
1062 if (_gens[i]->is_in_reserved(addr)) { | |
1063 assert(_gens[i]->is_in(addr), | |
1064 "addr should be in allocated part of generation"); | |
1065 return _gens[i]->block_size(addr); | |
1066 } | |
1067 } | |
1068 if (perm_gen()->is_in_reserved(addr)) { | |
1069 assert(perm_gen()->is_in(addr), | |
1070 "addr should be in allocated part of perm gen"); | |
1071 return perm_gen()->block_size(addr); | |
1072 } | |
1073 assert(false, "Some generation should contain the address"); | |
1074 return 0; | |
1075 } | |
1076 | |
1077 bool GenCollectedHeap::block_is_obj(const HeapWord* addr) const { | |
1078 assert(is_in_reserved(addr), "block_is_obj of address outside of heap"); | |
1079 assert(block_start(addr) == addr, "addr must be a block start"); | |
1080 for (int i = 0; i < _n_gens; i++) { | |
1081 if (_gens[i]->is_in_reserved(addr)) { | |
1082 return _gens[i]->block_is_obj(addr); | |
1083 } | |
1084 } | |
1085 if (perm_gen()->is_in_reserved(addr)) { | |
1086 return perm_gen()->block_is_obj(addr); | |
1087 } | |
1088 assert(false, "Some generation should contain the address"); | |
1089 return false; | |
1090 } | |
1091 | |
1092 bool GenCollectedHeap::supports_tlab_allocation() const { | |
1093 for (int i = 0; i < _n_gens; i += 1) { | |
1094 if (_gens[i]->supports_tlab_allocation()) { | |
1095 return true; | |
1096 } | |
1097 } | |
1098 return false; | |
1099 } | |
1100 | |
1101 size_t GenCollectedHeap::tlab_capacity(Thread* thr) const { | |
1102 size_t result = 0; | |
1103 for (int i = 0; i < _n_gens; i += 1) { | |
1104 if (_gens[i]->supports_tlab_allocation()) { | |
1105 result += _gens[i]->tlab_capacity(); | |
1106 } | |
1107 } | |
1108 return result; | |
1109 } | |
1110 | |
1111 size_t GenCollectedHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
1112 size_t result = 0; | |
1113 for (int i = 0; i < _n_gens; i += 1) { | |
1114 if (_gens[i]->supports_tlab_allocation()) { | |
1115 result += _gens[i]->unsafe_max_tlab_alloc(); | |
1116 } | |
1117 } | |
1118 return result; | |
1119 } | |
1120 | |
1121 HeapWord* GenCollectedHeap::allocate_new_tlab(size_t size) { | |
1122 bool gc_overhead_limit_was_exceeded; | |
1123 HeapWord* result = mem_allocate(size /* size */, | |
1124 false /* is_large_noref */, | |
1125 true /* is_tlab */, | |
1126 &gc_overhead_limit_was_exceeded); | |
1127 return result; | |
1128 } | |
1129 | |
1130 // Requires "*prev_ptr" to be non-NULL. Deletes and a block of minimal size | |
1131 // from the list headed by "*prev_ptr". | |
1132 static ScratchBlock *removeSmallestScratch(ScratchBlock **prev_ptr) { | |
1133 bool first = true; | |
1134 size_t min_size = 0; // "first" makes this conceptually infinite. | |
1135 ScratchBlock **smallest_ptr, *smallest; | |
1136 ScratchBlock *cur = *prev_ptr; | |
1137 while (cur) { | |
1138 assert(*prev_ptr == cur, "just checking"); | |
1139 if (first || cur->num_words < min_size) { | |
1140 smallest_ptr = prev_ptr; | |
1141 smallest = cur; | |
1142 min_size = smallest->num_words; | |
1143 first = false; | |
1144 } | |
1145 prev_ptr = &cur->next; | |
1146 cur = cur->next; | |
1147 } | |
1148 smallest = *smallest_ptr; | |
1149 *smallest_ptr = smallest->next; | |
1150 return smallest; | |
1151 } | |
1152 | |
1153 // Sort the scratch block list headed by res into decreasing size order, | |
1154 // and set "res" to the result. | |
1155 static void sort_scratch_list(ScratchBlock*& list) { | |
1156 ScratchBlock* sorted = NULL; | |
1157 ScratchBlock* unsorted = list; | |
1158 while (unsorted) { | |
1159 ScratchBlock *smallest = removeSmallestScratch(&unsorted); | |
1160 smallest->next = sorted; | |
1161 sorted = smallest; | |
1162 } | |
1163 list = sorted; | |
1164 } | |
1165 | |
1166 ScratchBlock* GenCollectedHeap::gather_scratch(Generation* requestor, | |
1167 size_t max_alloc_words) { | |
1168 ScratchBlock* res = NULL; | |
1169 for (int i = 0; i < _n_gens; i++) { | |
1170 _gens[i]->contribute_scratch(res, requestor, max_alloc_words); | |
1171 } | |
1172 sort_scratch_list(res); | |
1173 return res; | |
1174 } | |
1175 | |
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1176 void GenCollectedHeap::release_scratch() { |
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1177 for (int i = 0; i < _n_gens; i++) { |
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1178 _gens[i]->reset_scratch(); |
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1179 } |
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1180 } |
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1181 |
0 | 1182 size_t GenCollectedHeap::large_typearray_limit() { |
1183 return gen_policy()->large_typearray_limit(); | |
1184 } | |
1185 | |
1186 class GenPrepareForVerifyClosure: public GenCollectedHeap::GenClosure { | |
1187 void do_generation(Generation* gen) { | |
1188 gen->prepare_for_verify(); | |
1189 } | |
1190 }; | |
1191 | |
1192 void GenCollectedHeap::prepare_for_verify() { | |
1193 ensure_parsability(false); // no need to retire TLABs | |
1194 GenPrepareForVerifyClosure blk; | |
1195 generation_iterate(&blk, false); | |
1196 perm_gen()->prepare_for_verify(); | |
1197 } | |
1198 | |
1199 | |
1200 void GenCollectedHeap::generation_iterate(GenClosure* cl, | |
1201 bool old_to_young) { | |
1202 if (old_to_young) { | |
1203 for (int i = _n_gens-1; i >= 0; i--) { | |
1204 cl->do_generation(_gens[i]); | |
1205 } | |
1206 } else { | |
1207 for (int i = 0; i < _n_gens; i++) { | |
1208 cl->do_generation(_gens[i]); | |
1209 } | |
1210 } | |
1211 } | |
1212 | |
1213 void GenCollectedHeap::space_iterate(SpaceClosure* cl) { | |
1214 for (int i = 0; i < _n_gens; i++) { | |
1215 _gens[i]->space_iterate(cl, true); | |
1216 } | |
1217 perm_gen()->space_iterate(cl, true); | |
1218 } | |
1219 | |
1220 bool GenCollectedHeap::is_maximal_no_gc() const { | |
1221 for (int i = 0; i < _n_gens; i++) { // skip perm gen | |
1222 if (!_gens[i]->is_maximal_no_gc()) { | |
1223 return false; | |
1224 } | |
1225 } | |
1226 return true; | |
1227 } | |
1228 | |
1229 void GenCollectedHeap::save_marks() { | |
1230 for (int i = 0; i < _n_gens; i++) { | |
1231 _gens[i]->save_marks(); | |
1232 } | |
1233 perm_gen()->save_marks(); | |
1234 } | |
1235 | |
1236 void GenCollectedHeap::compute_new_generation_sizes(int collectedGen) { | |
1237 for (int i = 0; i <= collectedGen; i++) { | |
1238 _gens[i]->compute_new_size(); | |
1239 } | |
1240 } | |
1241 | |
1242 GenCollectedHeap* GenCollectedHeap::heap() { | |
1243 assert(_gch != NULL, "Uninitialized access to GenCollectedHeap::heap()"); | |
1244 assert(_gch->kind() == CollectedHeap::GenCollectedHeap, "not a generational heap"); | |
1245 return _gch; | |
1246 } | |
1247 | |
1248 | |
1249 void GenCollectedHeap::prepare_for_compaction() { | |
1250 Generation* scanning_gen = _gens[_n_gens-1]; | |
1251 // Start by compacting into same gen. | |
1252 CompactPoint cp(scanning_gen, NULL, NULL); | |
1253 while (scanning_gen != NULL) { | |
1254 scanning_gen->prepare_for_compaction(&cp); | |
1255 scanning_gen = prev_gen(scanning_gen); | |
1256 } | |
1257 } | |
1258 | |
1259 GCStats* GenCollectedHeap::gc_stats(int level) const { | |
1260 return _gens[level]->gc_stats(); | |
1261 } | |
1262 | |
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1263 void GenCollectedHeap::verify(bool allow_dirty, bool silent, bool option /* ignored */) { |
0 | 1264 if (!silent) { |
1265 gclog_or_tty->print("permgen "); | |
1266 } | |
1267 perm_gen()->verify(allow_dirty); | |
1268 for (int i = _n_gens-1; i >= 0; i--) { | |
1269 Generation* g = _gens[i]; | |
1270 if (!silent) { | |
1271 gclog_or_tty->print(g->name()); | |
1272 gclog_or_tty->print(" "); | |
1273 } | |
1274 g->verify(allow_dirty); | |
1275 } | |
1276 if (!silent) { | |
1277 gclog_or_tty->print("remset "); | |
1278 } | |
1279 rem_set()->verify(); | |
1280 if (!silent) { | |
1281 gclog_or_tty->print("ref_proc "); | |
1282 } | |
1283 ReferenceProcessor::verify(); | |
1284 } | |
1285 | |
1286 void GenCollectedHeap::print() const { print_on(tty); } | |
1287 void GenCollectedHeap::print_on(outputStream* st) const { | |
1288 for (int i = 0; i < _n_gens; i++) { | |
1289 _gens[i]->print_on(st); | |
1290 } | |
1291 perm_gen()->print_on(st); | |
1292 } | |
1293 | |
1294 void GenCollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
1295 if (workers() != NULL) { | |
1296 workers()->threads_do(tc); | |
1297 } | |
1298 #ifndef SERIALGC | |
1299 if (UseConcMarkSweepGC) { | |
1300 ConcurrentMarkSweepThread::threads_do(tc); | |
1301 } | |
1302 #endif // SERIALGC | |
1303 } | |
1304 | |
1305 void GenCollectedHeap::print_gc_threads_on(outputStream* st) const { | |
1306 #ifndef SERIALGC | |
1307 if (UseParNewGC) { | |
1308 workers()->print_worker_threads_on(st); | |
1309 } | |
1310 if (UseConcMarkSweepGC) { | |
1311 ConcurrentMarkSweepThread::print_all_on(st); | |
1312 } | |
1313 #endif // SERIALGC | |
1314 } | |
1315 | |
1316 void GenCollectedHeap::print_tracing_info() const { | |
1317 if (TraceGen0Time) { | |
1318 get_gen(0)->print_summary_info(); | |
1319 } | |
1320 if (TraceGen1Time) { | |
1321 get_gen(1)->print_summary_info(); | |
1322 } | |
1323 } | |
1324 | |
1325 void GenCollectedHeap::print_heap_change(size_t prev_used) const { | |
1326 if (PrintGCDetails && Verbose) { | |
1327 gclog_or_tty->print(" " SIZE_FORMAT | |
1328 "->" SIZE_FORMAT | |
1329 "(" SIZE_FORMAT ")", | |
1330 prev_used, used(), capacity()); | |
1331 } else { | |
1332 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
1333 "->" SIZE_FORMAT "K" | |
1334 "(" SIZE_FORMAT "K)", | |
1335 prev_used / K, used() / K, capacity() / K); | |
1336 } | |
1337 } | |
1338 | |
1339 //New method to print perm gen info with PrintGCDetails flag | |
1340 void GenCollectedHeap::print_perm_heap_change(size_t perm_prev_used) const { | |
1341 gclog_or_tty->print(", [%s :", perm_gen()->short_name()); | |
1342 perm_gen()->print_heap_change(perm_prev_used); | |
1343 gclog_or_tty->print("]"); | |
1344 } | |
1345 | |
1346 class GenGCPrologueClosure: public GenCollectedHeap::GenClosure { | |
1347 private: | |
1348 bool _full; | |
1349 public: | |
1350 void do_generation(Generation* gen) { | |
1351 gen->gc_prologue(_full); | |
1352 } | |
1353 GenGCPrologueClosure(bool full) : _full(full) {}; | |
1354 }; | |
1355 | |
1356 void GenCollectedHeap::gc_prologue(bool full) { | |
1357 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
1358 | |
1359 always_do_update_barrier = false; | |
1360 // Fill TLAB's and such | |
1361 CollectedHeap::accumulate_statistics_all_tlabs(); | |
1362 ensure_parsability(true); // retire TLABs | |
1363 | |
1364 // Call allocation profiler | |
1365 AllocationProfiler::iterate_since_last_gc(); | |
1366 // Walk generations | |
1367 GenGCPrologueClosure blk(full); | |
1368 generation_iterate(&blk, false); // not old-to-young. | |
1369 perm_gen()->gc_prologue(full); | |
1370 }; | |
1371 | |
1372 class GenGCEpilogueClosure: public GenCollectedHeap::GenClosure { | |
1373 private: | |
1374 bool _full; | |
1375 public: | |
1376 void do_generation(Generation* gen) { | |
1377 gen->gc_epilogue(_full); | |
1378 } | |
1379 GenGCEpilogueClosure(bool full) : _full(full) {}; | |
1380 }; | |
1381 | |
1382 void GenCollectedHeap::gc_epilogue(bool full) { | |
1383 #ifdef COMPILER2 | |
1384 assert(DerivedPointerTable::is_empty(), "derived pointer present"); | |
1385 size_t actual_gap = pointer_delta((HeapWord*) (max_uintx-3), *(end_addr())); | |
1386 guarantee(actual_gap > (size_t)FastAllocateSizeLimit, "inline allocation wraps"); | |
1387 #endif /* COMPILER2 */ | |
1388 | |
1389 resize_all_tlabs(); | |
1390 | |
1391 GenGCEpilogueClosure blk(full); | |
1392 generation_iterate(&blk, false); // not old-to-young. | |
1393 perm_gen()->gc_epilogue(full); | |
1394 | |
1395 always_do_update_barrier = UseConcMarkSweepGC; | |
1396 }; | |
1397 | |
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1398 #ifndef PRODUCT |
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1399 class GenGCSaveTopsBeforeGCClosure: public GenCollectedHeap::GenClosure { |
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1400 private: |
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1401 public: |
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1402 void do_generation(Generation* gen) { |
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1403 gen->record_spaces_top(); |
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1404 } |
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1405 }; |
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1406 |
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1407 void GenCollectedHeap::record_gen_tops_before_GC() { |
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1408 if (ZapUnusedHeapArea) { |
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1409 GenGCSaveTopsBeforeGCClosure blk; |
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1410 generation_iterate(&blk, false); // not old-to-young. |
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1411 perm_gen()->record_spaces_top(); |
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1412 } |
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1413 } |
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1414 #endif // not PRODUCT |
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1415 |
0 | 1416 class GenEnsureParsabilityClosure: public GenCollectedHeap::GenClosure { |
1417 public: | |
1418 void do_generation(Generation* gen) { | |
1419 gen->ensure_parsability(); | |
1420 } | |
1421 }; | |
1422 | |
1423 void GenCollectedHeap::ensure_parsability(bool retire_tlabs) { | |
1424 CollectedHeap::ensure_parsability(retire_tlabs); | |
1425 GenEnsureParsabilityClosure ep_cl; | |
1426 generation_iterate(&ep_cl, false); | |
1427 perm_gen()->ensure_parsability(); | |
1428 } | |
1429 | |
1430 oop GenCollectedHeap::handle_failed_promotion(Generation* gen, | |
1431 oop obj, | |
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1432 size_t obj_size) { |
0 | 1433 assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
1434 HeapWord* result = NULL; | |
1435 | |
1436 // First give each higher generation a chance to allocate the promoted object. | |
1437 Generation* allocator = next_gen(gen); | |
1438 if (allocator != NULL) { | |
1439 do { | |
1440 result = allocator->allocate(obj_size, false); | |
1441 } while (result == NULL && (allocator = next_gen(allocator)) != NULL); | |
1442 } | |
1443 | |
1444 if (result == NULL) { | |
1445 // Then give gen and higher generations a chance to expand and allocate the | |
1446 // object. | |
1447 do { | |
1448 result = gen->expand_and_allocate(obj_size, false); | |
1449 } while (result == NULL && (gen = next_gen(gen)) != NULL); | |
1450 } | |
1451 | |
1452 if (result != NULL) { | |
1453 Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); | |
1454 } | |
1455 return oop(result); | |
1456 } | |
1457 | |
1458 class GenTimeOfLastGCClosure: public GenCollectedHeap::GenClosure { | |
1459 jlong _time; // in ms | |
1460 jlong _now; // in ms | |
1461 | |
1462 public: | |
1463 GenTimeOfLastGCClosure(jlong now) : _time(now), _now(now) { } | |
1464 | |
1465 jlong time() { return _time; } | |
1466 | |
1467 void do_generation(Generation* gen) { | |
1468 _time = MIN2(_time, gen->time_of_last_gc(_now)); | |
1469 } | |
1470 }; | |
1471 | |
1472 jlong GenCollectedHeap::millis_since_last_gc() { | |
1473 jlong now = os::javaTimeMillis(); | |
1474 GenTimeOfLastGCClosure tolgc_cl(now); | |
1475 // iterate over generations getting the oldest | |
1476 // time that a generation was collected | |
1477 generation_iterate(&tolgc_cl, false); | |
1478 tolgc_cl.do_generation(perm_gen()); | |
1479 // XXX Despite the assert above, since javaTimeMillis() | |
1480 // doesnot guarantee monotonically increasing return | |
1481 // values (note, i didn't say "strictly monotonic"), | |
1482 // we need to guard against getting back a time | |
1483 // later than now. This should be fixed by basing | |
1484 // on someting like gethrtime() which guarantees | |
1485 // monotonicity. Note that cond_wait() is susceptible | |
1486 // to a similar problem, because its interface is | |
1487 // based on absolute time in the form of the | |
1488 // system time's notion of UCT. See also 4506635 | |
1489 // for yet another problem of similar nature. XXX | |
1490 jlong retVal = now - tolgc_cl.time(); | |
1491 if (retVal < 0) { | |
1492 NOT_PRODUCT(warning("time warp: %d", retVal);) | |
1493 return 0; | |
1494 } | |
1495 return retVal; | |
1496 } |