Mercurial > hg > truffle
annotate src/share/vm/memory/genCollectedHeap.cpp @ 17983:57aecf00a0cd
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author | neliasso |
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date | Fri, 13 Jun 2014 08:40:35 +0000 |
parents | 78bbf4d43a14 |
children | 52b4284cb496 0982ec23da03 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2014, 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" | |
10405 | 31 #include "gc_implementation/shared/gcTraceTime.hpp" |
1972 | 32 #include "gc_implementation/shared/vmGCOperations.hpp" |
33 #include "gc_interface/collectedHeap.inline.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/resourceArea.hpp" | |
41 #include "memory/sharedHeap.hpp" | |
42 #include "memory/space.hpp" | |
43 #include "oops/oop.inline.hpp" | |
44 #include "oops/oop.inline2.hpp" | |
45 #include "runtime/biasedLocking.hpp" | |
46 #include "runtime/fprofiler.hpp" | |
47 #include "runtime/handles.hpp" | |
48 #include "runtime/handles.inline.hpp" | |
49 #include "runtime/java.hpp" | |
50 #include "runtime/vmThread.hpp" | |
51 #include "services/memoryService.hpp" | |
52 #include "utilities/vmError.hpp" | |
53 #include "utilities/workgroup.hpp" | |
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54 #include "utilities/macros.hpp" |
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55 #if INCLUDE_ALL_GCS |
1972 | 56 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" |
57 #include "gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp" | |
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58 #endif // INCLUDE_ALL_GCS |
0 | 59 |
60 GenCollectedHeap* GenCollectedHeap::_gch; | |
61 NOT_PRODUCT(size_t GenCollectedHeap::_skip_header_HeapWords = 0;) | |
62 | |
63 // The set of potentially parallel tasks in strong root scanning. | |
64 enum GCH_process_strong_roots_tasks { | |
65 // We probably want to parallelize both of these internally, but for now... | |
66 GCH_PS_younger_gens, | |
67 // Leave this one last. | |
68 GCH_PS_NumElements | |
69 }; | |
70 | |
71 GenCollectedHeap::GenCollectedHeap(GenCollectorPolicy *policy) : | |
72 SharedHeap(policy), | |
73 _gen_policy(policy), | |
74 _gen_process_strong_tasks(new SubTasksDone(GCH_PS_NumElements)), | |
75 _full_collections_completed(0) | |
76 { | |
77 if (_gen_process_strong_tasks == NULL || | |
78 !_gen_process_strong_tasks->valid()) { | |
79 vm_exit_during_initialization("Failed necessary allocation."); | |
80 } | |
81 assert(policy != NULL, "Sanity check"); | |
82 } | |
83 | |
84 jint GenCollectedHeap::initialize() { | |
1166 | 85 CollectedHeap::pre_initialize(); |
86 | |
0 | 87 int i; |
88 _n_gens = gen_policy()->number_of_generations(); | |
89 | |
90 // While there are no constraints in the GC code that HeapWordSize | |
91 // be any particular value, there are multiple other areas in the | |
92 // system which believe this to be true (e.g. oop->object_size in some | |
93 // cases incorrectly returns the size in wordSize units rather than | |
94 // HeapWordSize). | |
95 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
96 | |
97 // The heap must be at least as aligned as generations. | |
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98 size_t gen_alignment = Generation::GenGrain; |
0 | 99 |
100 _gen_specs = gen_policy()->generations(); | |
101 | |
102 // Make sure the sizes are all aligned. | |
103 for (i = 0; i < _n_gens; i++) { | |
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104 _gen_specs[i]->align(gen_alignment); |
0 | 105 } |
106 | |
107 // Allocate space for the heap. | |
108 | |
109 char* heap_address; | |
110 size_t total_reserved = 0; | |
111 int n_covered_regions = 0; | |
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112 ReservedSpace heap_rs; |
0 | 113 |
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114 size_t heap_alignment = collector_policy()->heap_alignment(); |
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115 |
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116 heap_address = allocate(heap_alignment, &total_reserved, |
0 | 117 &n_covered_regions, &heap_rs); |
118 | |
119 if (!heap_rs.is_reserved()) { | |
120 vm_shutdown_during_initialization( | |
121 "Could not reserve enough space for object heap"); | |
122 return JNI_ENOMEM; | |
123 } | |
124 | |
125 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
126 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
127 | |
128 // It is important to do this in a way such that concurrent readers can't | |
129 // temporarily think somethings in the heap. (Seen this happen in asserts.) | |
130 _reserved.set_word_size(0); | |
131 _reserved.set_start((HeapWord*)heap_rs.base()); | |
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132 size_t actual_heap_size = heap_rs.size(); |
0 | 133 _reserved.set_end((HeapWord*)(heap_rs.base() + actual_heap_size)); |
134 | |
135 _rem_set = collector_policy()->create_rem_set(_reserved, n_covered_regions); | |
136 set_barrier_set(rem_set()->bs()); | |
1166 | 137 |
0 | 138 _gch = this; |
139 | |
140 for (i = 0; i < _n_gens; i++) { | |
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141 ReservedSpace this_rs = heap_rs.first_part(_gen_specs[i]->max_size(), false, false); |
0 | 142 _gens[i] = _gen_specs[i]->init(this_rs, i, rem_set()); |
143 heap_rs = heap_rs.last_part(_gen_specs[i]->max_size()); | |
144 } | |
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145 clear_incremental_collection_failed(); |
0 | 146 |
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147 #if INCLUDE_ALL_GCS |
0 | 148 // If we are running CMS, create the collector responsible |
149 // for collecting the CMS generations. | |
150 if (collector_policy()->is_concurrent_mark_sweep_policy()) { | |
151 bool success = create_cms_collector(); | |
152 if (!success) return JNI_ENOMEM; | |
153 } | |
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154 #endif // INCLUDE_ALL_GCS |
0 | 155 |
156 return JNI_OK; | |
157 } | |
158 | |
159 | |
160 char* GenCollectedHeap::allocate(size_t alignment, | |
161 size_t* _total_reserved, | |
162 int* _n_covered_regions, | |
163 ReservedSpace* heap_rs){ | |
164 const char overflow_msg[] = "The size of the object heap + VM data exceeds " | |
165 "the maximum representable size"; | |
166 | |
167 // Now figure out the total size. | |
168 size_t total_reserved = 0; | |
169 int n_covered_regions = 0; | |
170 const size_t pageSize = UseLargePages ? | |
171 os::large_page_size() : os::vm_page_size(); | |
172 | |
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173 assert(alignment % pageSize == 0, "Must be"); |
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174 |
0 | 175 for (int i = 0; i < _n_gens; i++) { |
176 total_reserved += _gen_specs[i]->max_size(); | |
177 if (total_reserved < _gen_specs[i]->max_size()) { | |
178 vm_exit_during_initialization(overflow_msg); | |
179 } | |
180 n_covered_regions += _gen_specs[i]->n_covered_regions(); | |
181 } | |
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182 assert(total_reserved % alignment == 0, |
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183 err_msg("Gen size; total_reserved=" SIZE_FORMAT ", alignment=" |
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184 SIZE_FORMAT, total_reserved, alignment)); |
0 | 185 |
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186 // Needed until the cardtable is fixed to have the right number |
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187 // of covered regions. |
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188 n_covered_regions += 2; |
0 | 189 |
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190 *_total_reserved = total_reserved; |
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191 *_n_covered_regions = n_covered_regions; |
0 | 192 |
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193 *heap_rs = Universe::reserve_heap(total_reserved, alignment); |
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194 return heap_rs->base(); |
0 | 195 } |
196 | |
197 | |
198 void GenCollectedHeap::post_initialize() { | |
199 SharedHeap::post_initialize(); | |
200 TwoGenerationCollectorPolicy *policy = | |
201 (TwoGenerationCollectorPolicy *)collector_policy(); | |
202 guarantee(policy->is_two_generation_policy(), "Illegal policy type"); | |
203 DefNewGeneration* def_new_gen = (DefNewGeneration*) get_gen(0); | |
204 assert(def_new_gen->kind() == Generation::DefNew || | |
205 def_new_gen->kind() == Generation::ParNew || | |
206 def_new_gen->kind() == Generation::ASParNew, | |
207 "Wrong generation kind"); | |
208 | |
209 Generation* old_gen = get_gen(1); | |
210 assert(old_gen->kind() == Generation::ConcurrentMarkSweep || | |
211 old_gen->kind() == Generation::ASConcurrentMarkSweep || | |
212 old_gen->kind() == Generation::MarkSweepCompact, | |
213 "Wrong generation kind"); | |
214 | |
215 policy->initialize_size_policy(def_new_gen->eden()->capacity(), | |
216 old_gen->capacity(), | |
217 def_new_gen->from()->capacity()); | |
218 policy->initialize_gc_policy_counters(); | |
219 } | |
220 | |
221 void GenCollectedHeap::ref_processing_init() { | |
222 SharedHeap::ref_processing_init(); | |
223 for (int i = 0; i < _n_gens; i++) { | |
224 _gens[i]->ref_processor_init(); | |
225 } | |
226 } | |
227 | |
228 size_t GenCollectedHeap::capacity() const { | |
229 size_t res = 0; | |
230 for (int i = 0; i < _n_gens; i++) { | |
231 res += _gens[i]->capacity(); | |
232 } | |
233 return res; | |
234 } | |
235 | |
236 size_t GenCollectedHeap::used() const { | |
237 size_t res = 0; | |
238 for (int i = 0; i < _n_gens; i++) { | |
239 res += _gens[i]->used(); | |
240 } | |
241 return res; | |
242 } | |
243 | |
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244 // Save the "used_region" for generations level and lower. |
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245 void GenCollectedHeap::save_used_regions(int level) { |
0 | 246 assert(level < _n_gens, "Illegal level parameter"); |
247 for (int i = level; i >= 0; i--) { | |
248 _gens[i]->save_used_region(); | |
249 } | |
250 } | |
251 | |
252 size_t GenCollectedHeap::max_capacity() const { | |
253 size_t res = 0; | |
254 for (int i = 0; i < _n_gens; i++) { | |
255 res += _gens[i]->max_capacity(); | |
256 } | |
257 return res; | |
258 } | |
259 | |
260 // Update the _full_collections_completed counter | |
261 // at the end of a stop-world full GC. | |
262 unsigned int GenCollectedHeap::update_full_collections_completed() { | |
263 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
264 assert(_full_collections_completed <= _total_full_collections, | |
265 "Can't complete more collections than were started"); | |
266 _full_collections_completed = _total_full_collections; | |
267 ml.notify_all(); | |
268 return _full_collections_completed; | |
269 } | |
270 | |
271 // Update the _full_collections_completed counter, as appropriate, | |
272 // at the end of a concurrent GC cycle. Note the conditional update | |
273 // below to allow this method to be called by a concurrent collector | |
274 // without synchronizing in any manner with the VM thread (which | |
275 // may already have initiated a STW full collection "concurrently"). | |
276 unsigned int GenCollectedHeap::update_full_collections_completed(unsigned int count) { | |
277 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
278 assert((_full_collections_completed <= _total_full_collections) && | |
279 (count <= _total_full_collections), | |
280 "Can't complete more collections than were started"); | |
281 if (count > _full_collections_completed) { | |
282 _full_collections_completed = count; | |
283 ml.notify_all(); | |
284 } | |
285 return _full_collections_completed; | |
286 } | |
287 | |
288 | |
289 #ifndef PRODUCT | |
290 // Override of memory state checking method in CollectedHeap: | |
291 // Some collectors (CMS for example) can't have badHeapWordVal written | |
292 // in the first two words of an object. (For instance , in the case of | |
293 // CMS these words hold state used to synchronize between certain | |
294 // (concurrent) GC steps and direct allocating mutators.) | |
295 // The skip_header_HeapWords() method below, allows us to skip | |
296 // over the requisite number of HeapWord's. Note that (for | |
297 // generational collectors) this means that those many words are | |
298 // skipped in each object, irrespective of the generation in which | |
299 // that object lives. The resultant loss of precision seems to be | |
300 // harmless and the pain of avoiding that imprecision appears somewhat | |
301 // higher than we are prepared to pay for such rudimentary debugging | |
302 // support. | |
303 void GenCollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, | |
304 size_t size) { | |
305 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
306 // We are asked to check a size in HeapWords, | |
307 // but the memory is mangled in juint words. | |
308 juint* start = (juint*) (addr + skip_header_HeapWords()); | |
309 juint* end = (juint*) (addr + size); | |
310 for (juint* slot = start; slot < end; slot += 1) { | |
311 assert(*slot == badHeapWordVal, | |
312 "Found non badHeapWordValue in pre-allocation check"); | |
313 } | |
314 } | |
315 } | |
316 #endif | |
317 | |
318 HeapWord* GenCollectedHeap::attempt_allocation(size_t size, | |
319 bool is_tlab, | |
320 bool first_only) { | |
321 HeapWord* res; | |
322 for (int i = 0; i < _n_gens; i++) { | |
323 if (_gens[i]->should_allocate(size, is_tlab)) { | |
324 res = _gens[i]->allocate(size, is_tlab); | |
325 if (res != NULL) return res; | |
326 else if (first_only) break; | |
327 } | |
328 } | |
329 // Otherwise... | |
330 return NULL; | |
331 } | |
332 | |
333 HeapWord* GenCollectedHeap::mem_allocate(size_t size, | |
334 bool* gc_overhead_limit_was_exceeded) { | |
335 return collector_policy()->mem_allocate_work(size, | |
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336 false /* is_tlab */, |
0 | 337 gc_overhead_limit_was_exceeded); |
338 } | |
339 | |
340 bool GenCollectedHeap::must_clear_all_soft_refs() { | |
341 return _gc_cause == GCCause::_last_ditch_collection; | |
342 } | |
343 | |
344 bool GenCollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { | |
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345 return UseConcMarkSweepGC && |
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346 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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347 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
0 | 348 } |
349 | |
350 void GenCollectedHeap::do_collection(bool full, | |
351 bool clear_all_soft_refs, | |
352 size_t size, | |
353 bool is_tlab, | |
354 int max_level) { | |
355 bool prepared_for_verification = false; | |
356 ResourceMark rm; | |
357 DEBUG_ONLY(Thread* my_thread = Thread::current();) | |
358 | |
359 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
360 assert(my_thread->is_VM_thread() || | |
361 my_thread->is_ConcurrentGC_thread(), | |
362 "incorrect thread type capability"); | |
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363 assert(Heap_lock->is_locked(), |
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364 "the requesting thread should have the Heap_lock"); |
0 | 365 guarantee(!is_gc_active(), "collection is not reentrant"); |
366 assert(max_level < n_gens(), "sanity check"); | |
367 | |
368 if (GC_locker::check_active_before_gc()) { | |
369 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
370 } | |
371 | |
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372 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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373 collector_policy()->should_clear_all_soft_refs(); |
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374 |
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375 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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376 |
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377 const size_t metadata_prev_used = MetaspaceAux::used_bytes(); |
0 | 378 |
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379 print_heap_before_gc(); |
0 | 380 |
381 { | |
382 FlagSetting fl(_is_gc_active, true); | |
383 | |
384 bool complete = full && (max_level == (n_gens()-1)); | |
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385 const char* gc_cause_prefix = complete ? "Full GC" : "GC"; |
0 | 386 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
387 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
10405 | 388 GCTraceTime t(GCCauseString(gc_cause_prefix, gc_cause()), PrintGCDetails, false, NULL); |
0 | 389 |
390 gc_prologue(complete); | |
391 increment_total_collections(complete); | |
392 | |
393 size_t gch_prev_used = used(); | |
394 | |
395 int starting_level = 0; | |
396 if (full) { | |
397 // Search for the oldest generation which will collect all younger | |
398 // generations, and start collection loop there. | |
399 for (int i = max_level; i >= 0; i--) { | |
400 if (_gens[i]->full_collects_younger_generations()) { | |
401 starting_level = i; | |
402 break; | |
403 } | |
404 } | |
405 } | |
406 | |
407 bool must_restore_marks_for_biased_locking = false; | |
408 | |
409 int max_level_collected = starting_level; | |
410 for (int i = starting_level; i <= max_level; i++) { | |
411 if (_gens[i]->should_collect(full, size, is_tlab)) { | |
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412 if (i == n_gens() - 1) { // a major collection is to happen |
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413 if (!complete) { |
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414 // The full_collections increment was missed above. |
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415 increment_total_full_collections(); |
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416 } |
10405 | 417 pre_full_gc_dump(NULL); // do any pre full gc dumps |
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418 } |
0 | 419 // Timer for individual generations. Last argument is false: no CR |
10405 | 420 // FIXME: We should try to start the timing earlier to cover more of the GC pause |
421 GCTraceTime t1(_gens[i]->short_name(), PrintGCDetails, false, NULL); | |
0 | 422 TraceCollectorStats tcs(_gens[i]->counters()); |
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423 TraceMemoryManagerStats tmms(_gens[i]->kind(),gc_cause()); |
0 | 424 |
425 size_t prev_used = _gens[i]->used(); | |
426 _gens[i]->stat_record()->invocations++; | |
427 _gens[i]->stat_record()->accumulated_time.start(); | |
428 | |
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429 // Must be done anew before each collection because |
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430 // a previous collection will do mangling and will |
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431 // change top of some spaces. |
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432 record_gen_tops_before_GC(); |
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433 |
0 | 434 if (PrintGC && Verbose) { |
435 gclog_or_tty->print("level=%d invoke=%d size=" SIZE_FORMAT, | |
436 i, | |
437 _gens[i]->stat_record()->invocations, | |
438 size*HeapWordSize); | |
439 } | |
440 | |
441 if (VerifyBeforeGC && i >= VerifyGCLevel && | |
442 total_collections() >= VerifyGCStartAt) { | |
443 HandleMark hm; // Discard invalid handles created during verification | |
444 if (!prepared_for_verification) { | |
445 prepare_for_verify(); | |
446 prepared_for_verification = true; | |
447 } | |
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448 Universe::verify(" VerifyBeforeGC:"); |
0 | 449 } |
450 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
451 | |
452 if (!must_restore_marks_for_biased_locking && | |
453 _gens[i]->performs_in_place_marking()) { | |
454 // We perform this mark word preservation work lazily | |
455 // because it's only at this point that we know whether we | |
456 // absolutely have to do it; we want to avoid doing it for | |
457 // scavenge-only collections where it's unnecessary | |
458 must_restore_marks_for_biased_locking = true; | |
459 BiasedLocking::preserve_marks(); | |
460 } | |
461 | |
462 // Do collection work | |
463 { | |
464 // Note on ref discovery: For what appear to be historical reasons, | |
465 // GCH enables and disabled (by enqueing) refs discovery. | |
466 // In the future this should be moved into the generation's | |
467 // collect method so that ref discovery and enqueueing concerns | |
468 // are local to a generation. The collect method could return | |
469 // an appropriate indication in the case that notification on | |
470 // the ref lock was needed. This will make the treatment of | |
471 // weak refs more uniform (and indeed remove such concerns | |
472 // from GCH). XXX | |
473 | |
474 HandleMark hm; // Discard invalid handles created during gc | |
475 save_marks(); // save marks for all gens | |
476 // We want to discover references, but not process them yet. | |
477 // This mode is disabled in process_discovered_references if the | |
478 // generation does some collection work, or in | |
479 // enqueue_discovered_references if the generation returns | |
480 // without doing any work. | |
481 ReferenceProcessor* rp = _gens[i]->ref_processor(); | |
482 // If the discovery of ("weak") refs in this generation is | |
483 // atomic wrt other collectors in this configuration, we | |
484 // are guaranteed to have empty discovered ref lists. | |
485 if (rp->discovery_is_atomic()) { | |
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486 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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487 rp->setup_policy(do_clear_all_soft_refs); |
0 | 488 } else { |
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489 // collect() below will enable discovery as appropriate |
0 | 490 } |
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491 _gens[i]->collect(full, do_clear_all_soft_refs, size, is_tlab); |
0 | 492 if (!rp->enqueuing_is_done()) { |
493 rp->enqueue_discovered_references(); | |
494 } else { | |
495 rp->set_enqueuing_is_done(false); | |
496 } | |
497 rp->verify_no_references_recorded(); | |
498 } | |
499 max_level_collected = i; | |
500 | |
501 // Determine if allocation request was met. | |
502 if (size > 0) { | |
503 if (!is_tlab || _gens[i]->supports_tlab_allocation()) { | |
504 if (size*HeapWordSize <= _gens[i]->unsafe_max_alloc_nogc()) { | |
505 size = 0; | |
506 } | |
507 } | |
508 } | |
509 | |
510 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
511 | |
512 _gens[i]->stat_record()->accumulated_time.stop(); | |
513 | |
514 update_gc_stats(i, full); | |
515 | |
516 if (VerifyAfterGC && i >= VerifyGCLevel && | |
517 total_collections() >= VerifyGCStartAt) { | |
518 HandleMark hm; // Discard invalid handles created during verification | |
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519 Universe::verify(" VerifyAfterGC:"); |
0 | 520 } |
521 | |
522 if (PrintGCDetails) { | |
523 gclog_or_tty->print(":"); | |
524 _gens[i]->print_heap_change(prev_used); | |
525 } | |
526 } | |
527 } | |
528 | |
529 // Update "complete" boolean wrt what actually transpired -- | |
530 // for instance, a promotion failure could have led to | |
531 // a whole heap collection. | |
532 complete = complete || (max_level_collected == n_gens() - 1); | |
533 | |
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534 if (complete) { // We did a "major" collection |
10405 | 535 // FIXME: See comment at pre_full_gc_dump call |
536 post_full_gc_dump(NULL); // do any post full gc dumps | |
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537 } |
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538 |
0 | 539 if (PrintGCDetails) { |
540 print_heap_change(gch_prev_used); | |
541 | |
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542 // Print metaspace info for full GC with PrintGCDetails flag. |
0 | 543 if (complete) { |
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544 MetaspaceAux::print_metaspace_change(metadata_prev_used); |
0 | 545 } |
546 } | |
547 | |
548 for (int j = max_level_collected; j >= 0; j -= 1) { | |
549 // Adjust generation sizes. | |
550 _gens[j]->compute_new_size(); | |
551 } | |
552 | |
553 if (complete) { | |
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554 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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555 ClassLoaderDataGraph::purge(); |
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556 MetaspaceAux::verify_metrics(); |
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557 // Resize the metaspace capacity after full collections |
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558 MetaspaceGC::compute_new_size(); |
0 | 559 update_full_collections_completed(); |
560 } | |
561 | |
562 // Track memory usage and detect low memory after GC finishes | |
563 MemoryService::track_memory_usage(); | |
564 | |
565 gc_epilogue(complete); | |
566 | |
567 if (must_restore_marks_for_biased_locking) { | |
568 BiasedLocking::restore_marks(); | |
569 } | |
570 } | |
571 | |
572 AdaptiveSizePolicy* sp = gen_policy()->size_policy(); | |
573 AdaptiveSizePolicyOutput(sp, total_collections()); | |
574 | |
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575 print_heap_after_gc(); |
0 | 576 |
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577 #ifdef TRACESPINNING |
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578 ParallelTaskTerminator::print_termination_counts(); |
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579 #endif |
0 | 580 } |
581 | |
582 HeapWord* GenCollectedHeap::satisfy_failed_allocation(size_t size, bool is_tlab) { | |
583 return collector_policy()->satisfy_failed_allocation(size, is_tlab); | |
584 } | |
585 | |
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586 void GenCollectedHeap::set_par_threads(uint t) { |
0 | 587 SharedHeap::set_par_threads(t); |
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588 _gen_process_strong_tasks->set_n_threads(t); |
0 | 589 } |
590 | |
591 void GenCollectedHeap:: | |
592 gen_process_strong_roots(int level, | |
593 bool younger_gens_as_roots, | |
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594 bool activate_scope, |
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595 bool is_scavenging, |
0 | 596 SharedHeap::ScanningOption so, |
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597 OopsInGenClosure* not_older_gens, |
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598 bool do_code_roots, |
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599 OopsInGenClosure* older_gens, |
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600 KlassClosure* klass_closure) { |
0 | 601 // General strong roots. |
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602 |
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603 if (!do_code_roots) { |
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604 SharedHeap::process_strong_roots(activate_scope, is_scavenging, so, |
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605 not_older_gens, NULL, klass_closure); |
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606 } else { |
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607 bool do_code_marking = (activate_scope || nmethod::oops_do_marking_is_active()); |
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608 CodeBlobToOopClosure code_roots(not_older_gens, /*do_marking=*/ do_code_marking); |
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609 SharedHeap::process_strong_roots(activate_scope, is_scavenging, so, |
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610 not_older_gens, &code_roots, klass_closure); |
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611 } |
0 | 612 |
613 if (younger_gens_as_roots) { | |
614 if (!_gen_process_strong_tasks->is_task_claimed(GCH_PS_younger_gens)) { | |
615 for (int i = 0; i < level; i++) { | |
616 not_older_gens->set_generation(_gens[i]); | |
617 _gens[i]->oop_iterate(not_older_gens); | |
618 } | |
619 not_older_gens->reset_generation(); | |
620 } | |
621 } | |
622 // When collection is parallel, all threads get to cooperate to do | |
623 // older-gen scanning. | |
624 for (int i = level+1; i < _n_gens; i++) { | |
625 older_gens->set_generation(_gens[i]); | |
626 rem_set()->younger_refs_iterate(_gens[i], older_gens); | |
627 older_gens->reset_generation(); | |
628 } | |
629 | |
630 _gen_process_strong_tasks->all_tasks_completed(); | |
631 } | |
632 | |
633 void GenCollectedHeap::gen_process_weak_roots(OopClosure* root_closure, | |
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634 CodeBlobClosure* code_roots) { |
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635 SharedHeap::process_weak_roots(root_closure, code_roots); |
0 | 636 // "Local" "weak" refs |
637 for (int i = 0; i < _n_gens; i++) { | |
638 _gens[i]->ref_processor()->weak_oops_do(root_closure); | |
639 } | |
640 } | |
641 | |
642 #define GCH_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
643 void GenCollectedHeap:: \ | |
644 oop_since_save_marks_iterate(int level, \ | |
645 OopClosureType* cur, \ | |
646 OopClosureType* older) { \ | |
647 _gens[level]->oop_since_save_marks_iterate##nv_suffix(cur); \ | |
648 for (int i = level+1; i < n_gens(); i++) { \ | |
649 _gens[i]->oop_since_save_marks_iterate##nv_suffix(older); \ | |
650 } \ | |
651 } | |
652 | |
653 ALL_SINCE_SAVE_MARKS_CLOSURES(GCH_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
654 | |
655 #undef GCH_SINCE_SAVE_MARKS_ITERATE_DEFN | |
656 | |
657 bool GenCollectedHeap::no_allocs_since_save_marks(int level) { | |
658 for (int i = level; i < _n_gens; i++) { | |
659 if (!_gens[i]->no_allocs_since_save_marks()) return false; | |
660 } | |
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661 return true; |
0 | 662 } |
663 | |
664 bool GenCollectedHeap::supports_inline_contig_alloc() const { | |
665 return _gens[0]->supports_inline_contig_alloc(); | |
666 } | |
667 | |
668 HeapWord** GenCollectedHeap::top_addr() const { | |
669 return _gens[0]->top_addr(); | |
670 } | |
671 | |
672 HeapWord** GenCollectedHeap::end_addr() const { | |
673 return _gens[0]->end_addr(); | |
674 } | |
675 | |
676 size_t GenCollectedHeap::unsafe_max_alloc() { | |
677 return _gens[0]->unsafe_max_alloc_nogc(); | |
678 } | |
679 | |
680 // public collection interfaces | |
681 | |
682 void GenCollectedHeap::collect(GCCause::Cause cause) { | |
683 if (should_do_concurrent_full_gc(cause)) { | |
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684 #if INCLUDE_ALL_GCS |
0 | 685 // mostly concurrent full collection |
686 collect_mostly_concurrent(cause); | |
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687 #else // INCLUDE_ALL_GCS |
0 | 688 ShouldNotReachHere(); |
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689 #endif // INCLUDE_ALL_GCS |
0 | 690 } else { |
691 #ifdef ASSERT | |
692 if (cause == GCCause::_scavenge_alot) { | |
693 // minor collection only | |
694 collect(cause, 0); | |
695 } else { | |
696 // Stop-the-world full collection | |
697 collect(cause, n_gens() - 1); | |
698 } | |
699 #else | |
700 // Stop-the-world full collection | |
701 collect(cause, n_gens() - 1); | |
702 #endif | |
703 } | |
704 } | |
705 | |
706 void GenCollectedHeap::collect(GCCause::Cause cause, int max_level) { | |
707 // The caller doesn't have the Heap_lock | |
708 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
709 MutexLocker ml(Heap_lock); | |
710 collect_locked(cause, max_level); | |
711 } | |
712 | |
713 void GenCollectedHeap::collect_locked(GCCause::Cause cause) { | |
714 // The caller has the Heap_lock | |
715 assert(Heap_lock->owned_by_self(), "this thread should own the Heap_lock"); | |
716 collect_locked(cause, n_gens() - 1); | |
717 } | |
718 | |
719 // this is the private collection interface | |
720 // The Heap_lock is expected to be held on entry. | |
721 | |
722 void GenCollectedHeap::collect_locked(GCCause::Cause cause, int max_level) { | |
723 // Read the GC count while holding the Heap_lock | |
724 unsigned int gc_count_before = total_collections(); | |
725 unsigned int full_gc_count_before = total_full_collections(); | |
726 { | |
727 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
728 VM_GenCollectFull op(gc_count_before, full_gc_count_before, | |
729 cause, max_level); | |
730 VMThread::execute(&op); | |
731 } | |
732 } | |
733 | |
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734 #if INCLUDE_ALL_GCS |
0 | 735 bool GenCollectedHeap::create_cms_collector() { |
736 | |
737 assert(((_gens[1]->kind() == Generation::ConcurrentMarkSweep) || | |
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738 (_gens[1]->kind() == Generation::ASConcurrentMarkSweep)), |
0 | 739 "Unexpected generation kinds"); |
740 // Skip two header words in the block content verification | |
741 NOT_PRODUCT(_skip_header_HeapWords = CMSCollector::skip_header_HeapWords();) | |
742 CMSCollector* collector = new CMSCollector( | |
743 (ConcurrentMarkSweepGeneration*)_gens[1], | |
744 _rem_set->as_CardTableRS(), | |
745 (ConcurrentMarkSweepPolicy*) collector_policy()); | |
746 | |
747 if (collector == NULL || !collector->completed_initialization()) { | |
748 if (collector) { | |
749 delete collector; // Be nice in embedded situation | |
750 } | |
751 vm_shutdown_during_initialization("Could not create CMS collector"); | |
752 return false; | |
753 } | |
754 return true; // success | |
755 } | |
756 | |
757 void GenCollectedHeap::collect_mostly_concurrent(GCCause::Cause cause) { | |
758 assert(!Heap_lock->owned_by_self(), "Should not own Heap_lock"); | |
759 | |
760 MutexLocker ml(Heap_lock); | |
761 // Read the GC counts while holding the Heap_lock | |
762 unsigned int full_gc_count_before = total_full_collections(); | |
763 unsigned int gc_count_before = total_collections(); | |
764 { | |
765 MutexUnlocker mu(Heap_lock); | |
766 VM_GenCollectFullConcurrent op(gc_count_before, full_gc_count_before, cause); | |
767 VMThread::execute(&op); | |
768 } | |
769 } | |
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770 #endif // INCLUDE_ALL_GCS |
0 | 771 |
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772 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs) { |
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773 do_full_collection(clear_all_soft_refs, _n_gens - 1); |
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774 } |
0 | 775 |
776 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs, | |
777 int max_level) { | |
778 int local_max_level; | |
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779 if (!incremental_collection_will_fail(false /* don't consult_young */) && |
0 | 780 gc_cause() == GCCause::_gc_locker) { |
781 local_max_level = 0; | |
782 } else { | |
783 local_max_level = max_level; | |
784 } | |
785 | |
786 do_collection(true /* full */, | |
787 clear_all_soft_refs /* clear_all_soft_refs */, | |
788 0 /* size */, | |
789 false /* is_tlab */, | |
790 local_max_level /* max_level */); | |
791 // Hack XXX FIX ME !!! | |
792 // A scavenge may not have been attempted, or may have | |
793 // been attempted and failed, because the old gen was too full | |
794 if (local_max_level == 0 && gc_cause() == GCCause::_gc_locker && | |
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795 incremental_collection_will_fail(false /* don't consult_young */)) { |
0 | 796 if (PrintGCDetails) { |
797 gclog_or_tty->print_cr("GC locker: Trying a full collection " | |
798 "because scavenge failed"); | |
799 } | |
800 // This time allow the old gen to be collected as well | |
801 do_collection(true /* full */, | |
802 clear_all_soft_refs /* clear_all_soft_refs */, | |
803 0 /* size */, | |
804 false /* is_tlab */, | |
805 n_gens() - 1 /* max_level */); | |
806 } | |
807 } | |
808 | |
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809 bool GenCollectedHeap::is_in_young(oop p) { |
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810 bool result = ((HeapWord*)p) < _gens[_n_gens - 1]->reserved().start(); |
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811 assert(result == _gens[0]->is_in_reserved(p), |
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812 err_msg("incorrect test - result=%d, p=" PTR_FORMAT, result, p2i((void*)p))); |
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813 return result; |
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814 } |
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815 |
4708 | 816 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
0 | 817 bool GenCollectedHeap::is_in(const void* p) const { |
818 #ifndef ASSERT | |
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819 guarantee(VerifyBeforeGC || |
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820 VerifyDuringGC || |
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821 VerifyBeforeExit || |
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822 VerifyDuringStartup || |
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823 PrintAssembly || |
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824 tty->count() != 0 || // already printing |
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825 VerifyAfterGC || |
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826 VMError::fatal_error_in_progress(), "too expensive"); |
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827 |
0 | 828 #endif |
829 // This might be sped up with a cache of the last generation that | |
830 // answered yes. | |
831 for (int i = 0; i < _n_gens; i++) { | |
832 if (_gens[i]->is_in(p)) return true; | |
833 } | |
834 // Otherwise... | |
835 return false; | |
836 } | |
837 | |
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838 #ifdef ASSERT |
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839 // Don't implement this by using is_in_young(). This method is used |
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840 // in some cases to check that is_in_young() is correct. |
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841 bool GenCollectedHeap::is_in_partial_collection(const void* p) { |
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842 assert(is_in_reserved(p) || p == NULL, |
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843 "Does not work if address is non-null and outside of the heap"); |
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844 return p < _gens[_n_gens - 2]->reserved().end() && p != NULL; |
0 | 845 } |
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846 #endif |
0 | 847 |
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848 void GenCollectedHeap::oop_iterate(ExtendedOopClosure* cl) { |
0 | 849 for (int i = 0; i < _n_gens; i++) { |
850 _gens[i]->oop_iterate(cl); | |
851 } | |
852 } | |
853 | |
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854 void GenCollectedHeap::oop_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
0 | 855 for (int i = 0; i < _n_gens; i++) { |
856 _gens[i]->oop_iterate(mr, cl); | |
857 } | |
858 } | |
859 | |
860 void GenCollectedHeap::object_iterate(ObjectClosure* cl) { | |
861 for (int i = 0; i < _n_gens; i++) { | |
862 _gens[i]->object_iterate(cl); | |
863 } | |
864 } | |
865 | |
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866 void GenCollectedHeap::safe_object_iterate(ObjectClosure* cl) { |
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867 for (int i = 0; i < _n_gens; i++) { |
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868 _gens[i]->safe_object_iterate(cl); |
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869 } |
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870 } |
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871 |
0 | 872 Space* GenCollectedHeap::space_containing(const void* addr) const { |
873 for (int i = 0; i < _n_gens; i++) { | |
874 Space* res = _gens[i]->space_containing(addr); | |
875 if (res != NULL) return res; | |
876 } | |
877 // Otherwise... | |
878 assert(false, "Could not find containing space"); | |
879 return NULL; | |
880 } | |
881 | |
882 | |
883 HeapWord* GenCollectedHeap::block_start(const void* addr) const { | |
884 assert(is_in_reserved(addr), "block_start of address outside of heap"); | |
885 for (int i = 0; i < _n_gens; i++) { | |
886 if (_gens[i]->is_in_reserved(addr)) { | |
887 assert(_gens[i]->is_in(addr), | |
888 "addr should be in allocated part of generation"); | |
889 return _gens[i]->block_start(addr); | |
890 } | |
891 } | |
892 assert(false, "Some generation should contain the address"); | |
893 return NULL; | |
894 } | |
895 | |
896 size_t GenCollectedHeap::block_size(const HeapWord* addr) const { | |
897 assert(is_in_reserved(addr), "block_size of address outside of heap"); | |
898 for (int i = 0; i < _n_gens; i++) { | |
899 if (_gens[i]->is_in_reserved(addr)) { | |
900 assert(_gens[i]->is_in(addr), | |
901 "addr should be in allocated part of generation"); | |
902 return _gens[i]->block_size(addr); | |
903 } | |
904 } | |
905 assert(false, "Some generation should contain the address"); | |
906 return 0; | |
907 } | |
908 | |
909 bool GenCollectedHeap::block_is_obj(const HeapWord* addr) const { | |
910 assert(is_in_reserved(addr), "block_is_obj of address outside of heap"); | |
911 assert(block_start(addr) == addr, "addr must be a block start"); | |
912 for (int i = 0; i < _n_gens; i++) { | |
913 if (_gens[i]->is_in_reserved(addr)) { | |
914 return _gens[i]->block_is_obj(addr); | |
915 } | |
916 } | |
917 assert(false, "Some generation should contain the address"); | |
918 return false; | |
919 } | |
920 | |
921 bool GenCollectedHeap::supports_tlab_allocation() const { | |
922 for (int i = 0; i < _n_gens; i += 1) { | |
923 if (_gens[i]->supports_tlab_allocation()) { | |
924 return true; | |
925 } | |
926 } | |
927 return false; | |
928 } | |
929 | |
930 size_t GenCollectedHeap::tlab_capacity(Thread* thr) const { | |
931 size_t result = 0; | |
932 for (int i = 0; i < _n_gens; i += 1) { | |
933 if (_gens[i]->supports_tlab_allocation()) { | |
934 result += _gens[i]->tlab_capacity(); | |
935 } | |
936 } | |
937 return result; | |
938 } | |
939 | |
17727 | 940 size_t GenCollectedHeap::tlab_used(Thread* thr) const { |
941 size_t result = 0; | |
942 for (int i = 0; i < _n_gens; i += 1) { | |
943 if (_gens[i]->supports_tlab_allocation()) { | |
944 result += _gens[i]->tlab_used(); | |
945 } | |
946 } | |
947 return result; | |
948 } | |
949 | |
0 | 950 size_t GenCollectedHeap::unsafe_max_tlab_alloc(Thread* thr) const { |
951 size_t result = 0; | |
952 for (int i = 0; i < _n_gens; i += 1) { | |
953 if (_gens[i]->supports_tlab_allocation()) { | |
954 result += _gens[i]->unsafe_max_tlab_alloc(); | |
955 } | |
956 } | |
957 return result; | |
958 } | |
959 | |
960 HeapWord* GenCollectedHeap::allocate_new_tlab(size_t size) { | |
961 bool gc_overhead_limit_was_exceeded; | |
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962 return collector_policy()->mem_allocate_work(size /* size */, |
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963 true /* is_tlab */, |
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964 &gc_overhead_limit_was_exceeded); |
0 | 965 } |
966 | |
967 // Requires "*prev_ptr" to be non-NULL. Deletes and a block of minimal size | |
968 // from the list headed by "*prev_ptr". | |
969 static ScratchBlock *removeSmallestScratch(ScratchBlock **prev_ptr) { | |
970 bool first = true; | |
971 size_t min_size = 0; // "first" makes this conceptually infinite. | |
972 ScratchBlock **smallest_ptr, *smallest; | |
973 ScratchBlock *cur = *prev_ptr; | |
974 while (cur) { | |
975 assert(*prev_ptr == cur, "just checking"); | |
976 if (first || cur->num_words < min_size) { | |
977 smallest_ptr = prev_ptr; | |
978 smallest = cur; | |
979 min_size = smallest->num_words; | |
980 first = false; | |
981 } | |
982 prev_ptr = &cur->next; | |
983 cur = cur->next; | |
984 } | |
985 smallest = *smallest_ptr; | |
986 *smallest_ptr = smallest->next; | |
987 return smallest; | |
988 } | |
989 | |
990 // Sort the scratch block list headed by res into decreasing size order, | |
991 // and set "res" to the result. | |
992 static void sort_scratch_list(ScratchBlock*& list) { | |
993 ScratchBlock* sorted = NULL; | |
994 ScratchBlock* unsorted = list; | |
995 while (unsorted) { | |
996 ScratchBlock *smallest = removeSmallestScratch(&unsorted); | |
997 smallest->next = sorted; | |
998 sorted = smallest; | |
999 } | |
1000 list = sorted; | |
1001 } | |
1002 | |
1003 ScratchBlock* GenCollectedHeap::gather_scratch(Generation* requestor, | |
1004 size_t max_alloc_words) { | |
1005 ScratchBlock* res = NULL; | |
1006 for (int i = 0; i < _n_gens; i++) { | |
1007 _gens[i]->contribute_scratch(res, requestor, max_alloc_words); | |
1008 } | |
1009 sort_scratch_list(res); | |
1010 return res; | |
1011 } | |
1012 | |
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1013 void GenCollectedHeap::release_scratch() { |
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1014 for (int i = 0; i < _n_gens; i++) { |
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1015 _gens[i]->reset_scratch(); |
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1016 } |
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1017 } |
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1018 |
0 | 1019 class GenPrepareForVerifyClosure: public GenCollectedHeap::GenClosure { |
1020 void do_generation(Generation* gen) { | |
1021 gen->prepare_for_verify(); | |
1022 } | |
1023 }; | |
1024 | |
1025 void GenCollectedHeap::prepare_for_verify() { | |
1026 ensure_parsability(false); // no need to retire TLABs | |
1027 GenPrepareForVerifyClosure blk; | |
1028 generation_iterate(&blk, false); | |
1029 } | |
1030 | |
1031 | |
1032 void GenCollectedHeap::generation_iterate(GenClosure* cl, | |
1033 bool old_to_young) { | |
1034 if (old_to_young) { | |
1035 for (int i = _n_gens-1; i >= 0; i--) { | |
1036 cl->do_generation(_gens[i]); | |
1037 } | |
1038 } else { | |
1039 for (int i = 0; i < _n_gens; i++) { | |
1040 cl->do_generation(_gens[i]); | |
1041 } | |
1042 } | |
1043 } | |
1044 | |
1045 void GenCollectedHeap::space_iterate(SpaceClosure* cl) { | |
1046 for (int i = 0; i < _n_gens; i++) { | |
1047 _gens[i]->space_iterate(cl, true); | |
1048 } | |
1049 } | |
1050 | |
1051 bool GenCollectedHeap::is_maximal_no_gc() const { | |
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1052 for (int i = 0; i < _n_gens; i++) { |
0 | 1053 if (!_gens[i]->is_maximal_no_gc()) { |
1054 return false; | |
1055 } | |
1056 } | |
1057 return true; | |
1058 } | |
1059 | |
1060 void GenCollectedHeap::save_marks() { | |
1061 for (int i = 0; i < _n_gens; i++) { | |
1062 _gens[i]->save_marks(); | |
1063 } | |
1064 } | |
1065 | |
1066 GenCollectedHeap* GenCollectedHeap::heap() { | |
1067 assert(_gch != NULL, "Uninitialized access to GenCollectedHeap::heap()"); | |
1068 assert(_gch->kind() == CollectedHeap::GenCollectedHeap, "not a generational heap"); | |
1069 return _gch; | |
1070 } | |
1071 | |
1072 | |
1073 void GenCollectedHeap::prepare_for_compaction() { | |
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1074 guarantee(_n_gens = 2, "Wrong number of generations"); |
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1075 Generation* old_gen = _gens[1]; |
0 | 1076 // Start by compacting into same gen. |
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1077 CompactPoint cp(old_gen, NULL, NULL); |
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1078 old_gen->prepare_for_compaction(&cp); |
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1079 Generation* young_gen = _gens[0]; |
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1080 young_gen->prepare_for_compaction(&cp); |
0 | 1081 } |
1082 | |
1083 GCStats* GenCollectedHeap::gc_stats(int level) const { | |
1084 return _gens[level]->gc_stats(); | |
1085 } | |
1086 | |
6008 | 1087 void GenCollectedHeap::verify(bool silent, VerifyOption option /* ignored */) { |
0 | 1088 for (int i = _n_gens-1; i >= 0; i--) { |
1089 Generation* g = _gens[i]; | |
1090 if (!silent) { | |
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1091 gclog_or_tty->print("%s", g->name()); |
0 | 1092 gclog_or_tty->print(" "); |
1093 } | |
6008 | 1094 g->verify(); |
0 | 1095 } |
1096 if (!silent) { | |
1097 gclog_or_tty->print("remset "); | |
1098 } | |
1099 rem_set()->verify(); | |
1100 } | |
1101 | |
1102 void GenCollectedHeap::print_on(outputStream* st) const { | |
1103 for (int i = 0; i < _n_gens; i++) { | |
1104 _gens[i]->print_on(st); | |
1105 } | |
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1106 MetaspaceAux::print_on(st); |
0 | 1107 } |
1108 | |
1109 void GenCollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
1110 if (workers() != NULL) { | |
1111 workers()->threads_do(tc); | |
1112 } | |
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1113 #if INCLUDE_ALL_GCS |
0 | 1114 if (UseConcMarkSweepGC) { |
1115 ConcurrentMarkSweepThread::threads_do(tc); | |
1116 } | |
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1117 #endif // INCLUDE_ALL_GCS |
0 | 1118 } |
1119 | |
1120 void GenCollectedHeap::print_gc_threads_on(outputStream* st) const { | |
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1121 #if INCLUDE_ALL_GCS |
0 | 1122 if (UseParNewGC) { |
1123 workers()->print_worker_threads_on(st); | |
1124 } | |
1125 if (UseConcMarkSweepGC) { | |
1126 ConcurrentMarkSweepThread::print_all_on(st); | |
1127 } | |
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1128 #endif // INCLUDE_ALL_GCS |
0 | 1129 } |
1130 | |
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1131 void GenCollectedHeap::print_on_error(outputStream* st) const { |
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1132 this->CollectedHeap::print_on_error(st); |
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1133 |
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1134 #if INCLUDE_ALL_GCS |
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1135 if (UseConcMarkSweepGC) { |
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1136 st->cr(); |
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1137 CMSCollector::print_on_error(st); |
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1138 } |
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1139 #endif // INCLUDE_ALL_GCS |
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1140 } |
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1141 |
0 | 1142 void GenCollectedHeap::print_tracing_info() const { |
1143 if (TraceGen0Time) { | |
1144 get_gen(0)->print_summary_info(); | |
1145 } | |
1146 if (TraceGen1Time) { | |
1147 get_gen(1)->print_summary_info(); | |
1148 } | |
1149 } | |
1150 | |
1151 void GenCollectedHeap::print_heap_change(size_t prev_used) const { | |
1152 if (PrintGCDetails && Verbose) { | |
1153 gclog_or_tty->print(" " SIZE_FORMAT | |
1154 "->" SIZE_FORMAT | |
1155 "(" SIZE_FORMAT ")", | |
1156 prev_used, used(), capacity()); | |
1157 } else { | |
1158 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
1159 "->" SIZE_FORMAT "K" | |
1160 "(" SIZE_FORMAT "K)", | |
1161 prev_used / K, used() / K, capacity() / K); | |
1162 } | |
1163 } | |
1164 | |
1165 class GenGCPrologueClosure: public GenCollectedHeap::GenClosure { | |
1166 private: | |
1167 bool _full; | |
1168 public: | |
1169 void do_generation(Generation* gen) { | |
1170 gen->gc_prologue(_full); | |
1171 } | |
1172 GenGCPrologueClosure(bool full) : _full(full) {}; | |
1173 }; | |
1174 | |
1175 void GenCollectedHeap::gc_prologue(bool full) { | |
1176 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
1177 | |
1178 always_do_update_barrier = false; | |
1179 // Fill TLAB's and such | |
1180 CollectedHeap::accumulate_statistics_all_tlabs(); | |
1181 ensure_parsability(true); // retire TLABs | |
1182 | |
1183 // Walk generations | |
1184 GenGCPrologueClosure blk(full); | |
1185 generation_iterate(&blk, false); // not old-to-young. | |
1186 }; | |
1187 | |
1188 class GenGCEpilogueClosure: public GenCollectedHeap::GenClosure { | |
1189 private: | |
1190 bool _full; | |
1191 public: | |
1192 void do_generation(Generation* gen) { | |
1193 gen->gc_epilogue(_full); | |
1194 } | |
1195 GenGCEpilogueClosure(bool full) : _full(full) {}; | |
1196 }; | |
1197 | |
1198 void GenCollectedHeap::gc_epilogue(bool full) { | |
1199 #ifdef COMPILER2 | |
1200 assert(DerivedPointerTable::is_empty(), "derived pointer present"); | |
1201 size_t actual_gap = pointer_delta((HeapWord*) (max_uintx-3), *(end_addr())); | |
1202 guarantee(actual_gap > (size_t)FastAllocateSizeLimit, "inline allocation wraps"); | |
1203 #endif /* COMPILER2 */ | |
1204 | |
1205 resize_all_tlabs(); | |
1206 | |
1207 GenGCEpilogueClosure blk(full); | |
1208 generation_iterate(&blk, false); // not old-to-young. | |
1209 | |
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1210 if (!CleanChunkPoolAsync) { |
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1211 Chunk::clean_chunk_pool(); |
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1212 } |
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1213 |
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1214 MetaspaceCounters::update_performance_counters(); |
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1215 CompressedClassSpaceCounters::update_performance_counters(); |
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1216 |
0 | 1217 always_do_update_barrier = UseConcMarkSweepGC; |
1218 }; | |
1219 | |
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1220 #ifndef PRODUCT |
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1221 class GenGCSaveTopsBeforeGCClosure: public GenCollectedHeap::GenClosure { |
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1222 private: |
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1223 public: |
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1224 void do_generation(Generation* gen) { |
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1225 gen->record_spaces_top(); |
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1226 } |
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1227 }; |
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1228 |
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1229 void GenCollectedHeap::record_gen_tops_before_GC() { |
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1230 if (ZapUnusedHeapArea) { |
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1231 GenGCSaveTopsBeforeGCClosure blk; |
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1232 generation_iterate(&blk, false); // not old-to-young. |
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1233 } |
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1234 } |
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1235 #endif // not PRODUCT |
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1236 |
0 | 1237 class GenEnsureParsabilityClosure: public GenCollectedHeap::GenClosure { |
1238 public: | |
1239 void do_generation(Generation* gen) { | |
1240 gen->ensure_parsability(); | |
1241 } | |
1242 }; | |
1243 | |
1244 void GenCollectedHeap::ensure_parsability(bool retire_tlabs) { | |
1245 CollectedHeap::ensure_parsability(retire_tlabs); | |
1246 GenEnsureParsabilityClosure ep_cl; | |
1247 generation_iterate(&ep_cl, false); | |
1248 } | |
1249 | |
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1250 oop GenCollectedHeap::handle_failed_promotion(Generation* old_gen, |
0 | 1251 oop obj, |
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1252 size_t obj_size) { |
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1253 guarantee(old_gen->level() == 1, "We only get here with an old generation"); |
0 | 1254 assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
1255 HeapWord* result = NULL; | |
1256 | |
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1257 result = old_gen->expand_and_allocate(obj_size, false); |
0 | 1258 |
1259 if (result != NULL) { | |
1260 Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); | |
1261 } | |
1262 return oop(result); | |
1263 } | |
1264 | |
1265 class GenTimeOfLastGCClosure: public GenCollectedHeap::GenClosure { | |
1266 jlong _time; // in ms | |
1267 jlong _now; // in ms | |
1268 | |
1269 public: | |
1270 GenTimeOfLastGCClosure(jlong now) : _time(now), _now(now) { } | |
1271 | |
1272 jlong time() { return _time; } | |
1273 | |
1274 void do_generation(Generation* gen) { | |
1275 _time = MIN2(_time, gen->time_of_last_gc(_now)); | |
1276 } | |
1277 }; | |
1278 | |
1279 jlong GenCollectedHeap::millis_since_last_gc() { | |
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1280 // We need a monotonically non-deccreasing time in ms but |
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1281 // os::javaTimeMillis() does not guarantee monotonicity. |
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1282 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 1283 GenTimeOfLastGCClosure tolgc_cl(now); |
1284 // iterate over generations getting the oldest | |
1285 // time that a generation was collected | |
1286 generation_iterate(&tolgc_cl, false); | |
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1287 |
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1288 // javaTimeNanos() is guaranteed to be monotonically non-decreasing |
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1289 // provided the underlying platform provides such a time source |
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1290 // (and it is bug free). So we still have to guard against getting |
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1291 // back a time later than 'now'. |
0 | 1292 jlong retVal = now - tolgc_cl.time(); |
1293 if (retVal < 0) { | |
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1294 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, (int64_t) retVal);) |
0 | 1295 return 0; |
1296 } | |
1297 return retVal; | |
1298 } |