Mercurial > hg > truffle
annotate src/share/vm/memory/genCollectedHeap.cpp @ 20197:ce8f6bb717c9
8042195: Introduce umbrella header orderAccess.inline.hpp.
Reviewed-by: dholmes, kvn, stefank, twisti
author | goetz |
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date | Tue, 29 Apr 2014 15:17:27 +0200 |
parents | 0982ec23da03 |
children | 9fec19bb0659 |
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" | |
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31 #include "gc_implementation/shared/gcTrace.hpp" |
10405 | 32 #include "gc_implementation/shared/gcTraceTime.hpp" |
1972 | 33 #include "gc_implementation/shared/vmGCOperations.hpp" |
34 #include "gc_interface/collectedHeap.inline.hpp" | |
35 #include "memory/filemap.hpp" | |
36 #include "memory/gcLocker.inline.hpp" | |
37 #include "memory/genCollectedHeap.hpp" | |
38 #include "memory/genOopClosures.inline.hpp" | |
39 #include "memory/generation.inline.hpp" | |
40 #include "memory/generationSpec.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/biasedLocking.hpp" | |
47 #include "runtime/fprofiler.hpp" | |
48 #include "runtime/handles.hpp" | |
49 #include "runtime/handles.inline.hpp" | |
50 #include "runtime/java.hpp" | |
51 #include "runtime/vmThread.hpp" | |
52 #include "services/memoryService.hpp" | |
53 #include "utilities/vmError.hpp" | |
54 #include "utilities/workgroup.hpp" | |
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55 #include "utilities/macros.hpp" |
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56 #if INCLUDE_ALL_GCS |
1972 | 57 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" |
58 #include "gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp" | |
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59 #endif // INCLUDE_ALL_GCS |
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 } | |
84 | |
85 jint GenCollectedHeap::initialize() { | |
1166 | 86 CollectedHeap::pre_initialize(); |
87 | |
0 | 88 int i; |
89 _n_gens = gen_policy()->number_of_generations(); | |
90 | |
91 // While there are no constraints in the GC code that HeapWordSize | |
92 // be any particular value, there are multiple other areas in the | |
93 // system which believe this to be true (e.g. oop->object_size in some | |
94 // cases incorrectly returns the size in wordSize units rather than | |
95 // HeapWordSize). | |
96 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
97 | |
98 // The heap must be at least as aligned as generations. | |
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99 size_t gen_alignment = Generation::GenGrain; |
0 | 100 |
101 _gen_specs = gen_policy()->generations(); | |
102 | |
103 // Make sure the sizes are all aligned. | |
104 for (i = 0; i < _n_gens; i++) { | |
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105 _gen_specs[i]->align(gen_alignment); |
0 | 106 } |
107 | |
108 // Allocate space for the heap. | |
109 | |
110 char* heap_address; | |
111 size_t total_reserved = 0; | |
112 int n_covered_regions = 0; | |
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113 ReservedSpace heap_rs; |
0 | 114 |
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115 size_t heap_alignment = collector_policy()->heap_alignment(); |
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116 |
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117 heap_address = allocate(heap_alignment, &total_reserved, |
0 | 118 &n_covered_regions, &heap_rs); |
119 | |
120 if (!heap_rs.is_reserved()) { | |
121 vm_shutdown_during_initialization( | |
122 "Could not reserve enough space for object heap"); | |
123 return JNI_ENOMEM; | |
124 } | |
125 | |
126 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
127 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
128 | |
129 // It is important to do this in a way such that concurrent readers can't | |
130 // temporarily think somethings in the heap. (Seen this happen in asserts.) | |
131 _reserved.set_word_size(0); | |
132 _reserved.set_start((HeapWord*)heap_rs.base()); | |
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133 size_t actual_heap_size = heap_rs.size(); |
0 | 134 _reserved.set_end((HeapWord*)(heap_rs.base() + actual_heap_size)); |
135 | |
136 _rem_set = collector_policy()->create_rem_set(_reserved, n_covered_regions); | |
137 set_barrier_set(rem_set()->bs()); | |
1166 | 138 |
0 | 139 _gch = this; |
140 | |
141 for (i = 0; i < _n_gens; i++) { | |
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142 ReservedSpace this_rs = heap_rs.first_part(_gen_specs[i]->max_size(), false, false); |
0 | 143 _gens[i] = _gen_specs[i]->init(this_rs, i, rem_set()); |
144 heap_rs = heap_rs.last_part(_gen_specs[i]->max_size()); | |
145 } | |
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146 clear_incremental_collection_failed(); |
0 | 147 |
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148 #if INCLUDE_ALL_GCS |
0 | 149 // If we are running CMS, create the collector responsible |
150 // for collecting the CMS generations. | |
151 if (collector_policy()->is_concurrent_mark_sweep_policy()) { | |
152 bool success = create_cms_collector(); | |
153 if (!success) return JNI_ENOMEM; | |
154 } | |
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155 #endif // INCLUDE_ALL_GCS |
0 | 156 |
157 return JNI_OK; | |
158 } | |
159 | |
160 | |
161 char* GenCollectedHeap::allocate(size_t alignment, | |
162 size_t* _total_reserved, | |
163 int* _n_covered_regions, | |
164 ReservedSpace* heap_rs){ | |
165 const char overflow_msg[] = "The size of the object heap + VM data exceeds " | |
166 "the maximum representable size"; | |
167 | |
168 // Now figure out the total size. | |
169 size_t total_reserved = 0; | |
170 int n_covered_regions = 0; | |
171 const size_t pageSize = UseLargePages ? | |
172 os::large_page_size() : os::vm_page_size(); | |
173 | |
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174 assert(alignment % pageSize == 0, "Must be"); |
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175 |
0 | 176 for (int i = 0; i < _n_gens; i++) { |
177 total_reserved += _gen_specs[i]->max_size(); | |
178 if (total_reserved < _gen_specs[i]->max_size()) { | |
179 vm_exit_during_initialization(overflow_msg); | |
180 } | |
181 n_covered_regions += _gen_specs[i]->n_covered_regions(); | |
182 } | |
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183 assert(total_reserved % alignment == 0, |
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184 err_msg("Gen size; total_reserved=" SIZE_FORMAT ", alignment=" |
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185 SIZE_FORMAT, total_reserved, alignment)); |
0 | 186 |
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187 // Needed until the cardtable is fixed to have the right number |
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188 // of covered regions. |
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189 n_covered_regions += 2; |
0 | 190 |
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191 *_total_reserved = total_reserved; |
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192 *_n_covered_regions = n_covered_regions; |
0 | 193 |
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194 *heap_rs = Universe::reserve_heap(total_reserved, alignment); |
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195 return heap_rs->base(); |
0 | 196 } |
197 | |
198 | |
199 void GenCollectedHeap::post_initialize() { | |
200 SharedHeap::post_initialize(); | |
201 TwoGenerationCollectorPolicy *policy = | |
202 (TwoGenerationCollectorPolicy *)collector_policy(); | |
203 guarantee(policy->is_two_generation_policy(), "Illegal policy type"); | |
204 DefNewGeneration* def_new_gen = (DefNewGeneration*) get_gen(0); | |
205 assert(def_new_gen->kind() == Generation::DefNew || | |
206 def_new_gen->kind() == Generation::ParNew || | |
207 def_new_gen->kind() == Generation::ASParNew, | |
208 "Wrong generation kind"); | |
209 | |
210 Generation* old_gen = get_gen(1); | |
211 assert(old_gen->kind() == Generation::ConcurrentMarkSweep || | |
212 old_gen->kind() == Generation::ASConcurrentMarkSweep || | |
213 old_gen->kind() == Generation::MarkSweepCompact, | |
214 "Wrong generation kind"); | |
215 | |
216 policy->initialize_size_policy(def_new_gen->eden()->capacity(), | |
217 old_gen->capacity(), | |
218 def_new_gen->from()->capacity()); | |
219 policy->initialize_gc_policy_counters(); | |
220 } | |
221 | |
222 void GenCollectedHeap::ref_processing_init() { | |
223 SharedHeap::ref_processing_init(); | |
224 for (int i = 0; i < _n_gens; i++) { | |
225 _gens[i]->ref_processor_init(); | |
226 } | |
227 } | |
228 | |
229 size_t GenCollectedHeap::capacity() const { | |
230 size_t res = 0; | |
231 for (int i = 0; i < _n_gens; i++) { | |
232 res += _gens[i]->capacity(); | |
233 } | |
234 return res; | |
235 } | |
236 | |
237 size_t GenCollectedHeap::used() const { | |
238 size_t res = 0; | |
239 for (int i = 0; i < _n_gens; i++) { | |
240 res += _gens[i]->used(); | |
241 } | |
242 return res; | |
243 } | |
244 | |
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245 // Save the "used_region" for generations level and lower. |
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246 void GenCollectedHeap::save_used_regions(int level) { |
0 | 247 assert(level < _n_gens, "Illegal level parameter"); |
248 for (int i = level; i >= 0; i--) { | |
249 _gens[i]->save_used_region(); | |
250 } | |
251 } | |
252 | |
253 size_t GenCollectedHeap::max_capacity() const { | |
254 size_t res = 0; | |
255 for (int i = 0; i < _n_gens; i++) { | |
256 res += _gens[i]->max_capacity(); | |
257 } | |
258 return res; | |
259 } | |
260 | |
261 // Update the _full_collections_completed counter | |
262 // at the end of a stop-world full GC. | |
263 unsigned int GenCollectedHeap::update_full_collections_completed() { | |
264 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
265 assert(_full_collections_completed <= _total_full_collections, | |
266 "Can't complete more collections than were started"); | |
267 _full_collections_completed = _total_full_collections; | |
268 ml.notify_all(); | |
269 return _full_collections_completed; | |
270 } | |
271 | |
272 // Update the _full_collections_completed counter, as appropriate, | |
273 // at the end of a concurrent GC cycle. Note the conditional update | |
274 // below to allow this method to be called by a concurrent collector | |
275 // without synchronizing in any manner with the VM thread (which | |
276 // may already have initiated a STW full collection "concurrently"). | |
277 unsigned int GenCollectedHeap::update_full_collections_completed(unsigned int count) { | |
278 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
279 assert((_full_collections_completed <= _total_full_collections) && | |
280 (count <= _total_full_collections), | |
281 "Can't complete more collections than were started"); | |
282 if (count > _full_collections_completed) { | |
283 _full_collections_completed = count; | |
284 ml.notify_all(); | |
285 } | |
286 return _full_collections_completed; | |
287 } | |
288 | |
289 | |
290 #ifndef PRODUCT | |
291 // Override of memory state checking method in CollectedHeap: | |
292 // Some collectors (CMS for example) can't have badHeapWordVal written | |
293 // in the first two words of an object. (For instance , in the case of | |
294 // CMS these words hold state used to synchronize between certain | |
295 // (concurrent) GC steps and direct allocating mutators.) | |
296 // The skip_header_HeapWords() method below, allows us to skip | |
297 // over the requisite number of HeapWord's. Note that (for | |
298 // generational collectors) this means that those many words are | |
299 // skipped in each object, irrespective of the generation in which | |
300 // that object lives. The resultant loss of precision seems to be | |
301 // harmless and the pain of avoiding that imprecision appears somewhat | |
302 // higher than we are prepared to pay for such rudimentary debugging | |
303 // support. | |
304 void GenCollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, | |
305 size_t size) { | |
306 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
307 // We are asked to check a size in HeapWords, | |
308 // but the memory is mangled in juint words. | |
309 juint* start = (juint*) (addr + skip_header_HeapWords()); | |
310 juint* end = (juint*) (addr + size); | |
311 for (juint* slot = start; slot < end; slot += 1) { | |
312 assert(*slot == badHeapWordVal, | |
313 "Found non badHeapWordValue in pre-allocation check"); | |
314 } | |
315 } | |
316 } | |
317 #endif | |
318 | |
319 HeapWord* GenCollectedHeap::attempt_allocation(size_t size, | |
320 bool is_tlab, | |
321 bool first_only) { | |
322 HeapWord* res; | |
323 for (int i = 0; i < _n_gens; i++) { | |
324 if (_gens[i]->should_allocate(size, is_tlab)) { | |
325 res = _gens[i]->allocate(size, is_tlab); | |
326 if (res != NULL) return res; | |
327 else if (first_only) break; | |
328 } | |
329 } | |
330 // Otherwise... | |
331 return NULL; | |
332 } | |
333 | |
334 HeapWord* GenCollectedHeap::mem_allocate(size_t size, | |
335 bool* gc_overhead_limit_was_exceeded) { | |
336 return collector_policy()->mem_allocate_work(size, | |
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337 false /* is_tlab */, |
0 | 338 gc_overhead_limit_was_exceeded); |
339 } | |
340 | |
341 bool GenCollectedHeap::must_clear_all_soft_refs() { | |
342 return _gc_cause == GCCause::_last_ditch_collection; | |
343 } | |
344 | |
345 bool GenCollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { | |
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346 return UseConcMarkSweepGC && |
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347 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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348 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
0 | 349 } |
350 | |
351 void GenCollectedHeap::do_collection(bool full, | |
352 bool clear_all_soft_refs, | |
353 size_t size, | |
354 bool is_tlab, | |
355 int max_level) { | |
356 bool prepared_for_verification = false; | |
357 ResourceMark rm; | |
358 DEBUG_ONLY(Thread* my_thread = Thread::current();) | |
359 | |
360 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
361 assert(my_thread->is_VM_thread() || | |
362 my_thread->is_ConcurrentGC_thread(), | |
363 "incorrect thread type capability"); | |
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364 assert(Heap_lock->is_locked(), |
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365 "the requesting thread should have the Heap_lock"); |
0 | 366 guarantee(!is_gc_active(), "collection is not reentrant"); |
367 assert(max_level < n_gens(), "sanity check"); | |
368 | |
369 if (GC_locker::check_active_before_gc()) { | |
370 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
371 } | |
372 | |
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373 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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374 collector_policy()->should_clear_all_soft_refs(); |
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375 |
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376 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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377 |
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378 const size_t metadata_prev_used = MetaspaceAux::used_bytes(); |
0 | 379 |
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380 print_heap_before_gc(); |
0 | 381 |
382 { | |
383 FlagSetting fl(_is_gc_active, true); | |
384 | |
385 bool complete = full && (max_level == (n_gens()-1)); | |
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386 const char* gc_cause_prefix = complete ? "Full GC" : "GC"; |
0 | 387 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
388 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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389 // The PrintGCDetails logging starts before we have incremented the GC id. We will do that later |
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390 // so we can assume here that the next GC id is what we want. |
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391 GCTraceTime t(GCCauseString(gc_cause_prefix, gc_cause()), PrintGCDetails, false, NULL, GCId::peek()); |
0 | 392 |
393 gc_prologue(complete); | |
394 increment_total_collections(complete); | |
395 | |
396 size_t gch_prev_used = used(); | |
397 | |
398 int starting_level = 0; | |
399 if (full) { | |
400 // Search for the oldest generation which will collect all younger | |
401 // generations, and start collection loop there. | |
402 for (int i = max_level; i >= 0; i--) { | |
403 if (_gens[i]->full_collects_younger_generations()) { | |
404 starting_level = i; | |
405 break; | |
406 } | |
407 } | |
408 } | |
409 | |
410 bool must_restore_marks_for_biased_locking = false; | |
411 | |
412 int max_level_collected = starting_level; | |
413 for (int i = starting_level; i <= max_level; i++) { | |
414 if (_gens[i]->should_collect(full, size, is_tlab)) { | |
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415 if (i == n_gens() - 1) { // a major collection is to happen |
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416 if (!complete) { |
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417 // The full_collections increment was missed above. |
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418 increment_total_full_collections(); |
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419 } |
10405 | 420 pre_full_gc_dump(NULL); // do any pre full gc dumps |
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421 } |
0 | 422 // Timer for individual generations. Last argument is false: no CR |
10405 | 423 // FIXME: We should try to start the timing earlier to cover more of the GC pause |
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424 // The PrintGCDetails logging starts before we have incremented the GC id. We will do that later |
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425 // so we can assume here that the next GC id is what we want. |
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426 GCTraceTime t1(_gens[i]->short_name(), PrintGCDetails, false, NULL, GCId::peek()); |
0 | 427 TraceCollectorStats tcs(_gens[i]->counters()); |
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428 TraceMemoryManagerStats tmms(_gens[i]->kind(),gc_cause()); |
0 | 429 |
430 size_t prev_used = _gens[i]->used(); | |
431 _gens[i]->stat_record()->invocations++; | |
432 _gens[i]->stat_record()->accumulated_time.start(); | |
433 | |
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434 // Must be done anew before each collection because |
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435 // a previous collection will do mangling and will |
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436 // change top of some spaces. |
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437 record_gen_tops_before_GC(); |
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438 |
0 | 439 if (PrintGC && Verbose) { |
440 gclog_or_tty->print("level=%d invoke=%d size=" SIZE_FORMAT, | |
441 i, | |
442 _gens[i]->stat_record()->invocations, | |
443 size*HeapWordSize); | |
444 } | |
445 | |
446 if (VerifyBeforeGC && i >= VerifyGCLevel && | |
447 total_collections() >= VerifyGCStartAt) { | |
448 HandleMark hm; // Discard invalid handles created during verification | |
449 if (!prepared_for_verification) { | |
450 prepare_for_verify(); | |
451 prepared_for_verification = true; | |
452 } | |
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453 Universe::verify(" VerifyBeforeGC:"); |
0 | 454 } |
455 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
456 | |
457 if (!must_restore_marks_for_biased_locking && | |
458 _gens[i]->performs_in_place_marking()) { | |
459 // We perform this mark word preservation work lazily | |
460 // because it's only at this point that we know whether we | |
461 // absolutely have to do it; we want to avoid doing it for | |
462 // scavenge-only collections where it's unnecessary | |
463 must_restore_marks_for_biased_locking = true; | |
464 BiasedLocking::preserve_marks(); | |
465 } | |
466 | |
467 // Do collection work | |
468 { | |
469 // Note on ref discovery: For what appear to be historical reasons, | |
470 // GCH enables and disabled (by enqueing) refs discovery. | |
471 // In the future this should be moved into the generation's | |
472 // collect method so that ref discovery and enqueueing concerns | |
473 // are local to a generation. The collect method could return | |
474 // an appropriate indication in the case that notification on | |
475 // the ref lock was needed. This will make the treatment of | |
476 // weak refs more uniform (and indeed remove such concerns | |
477 // from GCH). XXX | |
478 | |
479 HandleMark hm; // Discard invalid handles created during gc | |
480 save_marks(); // save marks for all gens | |
481 // We want to discover references, but not process them yet. | |
482 // This mode is disabled in process_discovered_references if the | |
483 // generation does some collection work, or in | |
484 // enqueue_discovered_references if the generation returns | |
485 // without doing any work. | |
486 ReferenceProcessor* rp = _gens[i]->ref_processor(); | |
487 // If the discovery of ("weak") refs in this generation is | |
488 // atomic wrt other collectors in this configuration, we | |
489 // are guaranteed to have empty discovered ref lists. | |
490 if (rp->discovery_is_atomic()) { | |
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491 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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492 rp->setup_policy(do_clear_all_soft_refs); |
0 | 493 } else { |
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494 // collect() below will enable discovery as appropriate |
0 | 495 } |
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496 _gens[i]->collect(full, do_clear_all_soft_refs, size, is_tlab); |
0 | 497 if (!rp->enqueuing_is_done()) { |
498 rp->enqueue_discovered_references(); | |
499 } else { | |
500 rp->set_enqueuing_is_done(false); | |
501 } | |
502 rp->verify_no_references_recorded(); | |
503 } | |
504 max_level_collected = i; | |
505 | |
506 // Determine if allocation request was met. | |
507 if (size > 0) { | |
508 if (!is_tlab || _gens[i]->supports_tlab_allocation()) { | |
509 if (size*HeapWordSize <= _gens[i]->unsafe_max_alloc_nogc()) { | |
510 size = 0; | |
511 } | |
512 } | |
513 } | |
514 | |
515 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
516 | |
517 _gens[i]->stat_record()->accumulated_time.stop(); | |
518 | |
519 update_gc_stats(i, full); | |
520 | |
521 if (VerifyAfterGC && i >= VerifyGCLevel && | |
522 total_collections() >= VerifyGCStartAt) { | |
523 HandleMark hm; // Discard invalid handles created during verification | |
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524 Universe::verify(" VerifyAfterGC:"); |
0 | 525 } |
526 | |
527 if (PrintGCDetails) { | |
528 gclog_or_tty->print(":"); | |
529 _gens[i]->print_heap_change(prev_used); | |
530 } | |
531 } | |
532 } | |
533 | |
534 // Update "complete" boolean wrt what actually transpired -- | |
535 // for instance, a promotion failure could have led to | |
536 // a whole heap collection. | |
537 complete = complete || (max_level_collected == n_gens() - 1); | |
538 | |
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539 if (complete) { // We did a "major" collection |
10405 | 540 // FIXME: See comment at pre_full_gc_dump call |
541 post_full_gc_dump(NULL); // do any post full gc dumps | |
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542 } |
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543 |
0 | 544 if (PrintGCDetails) { |
545 print_heap_change(gch_prev_used); | |
546 | |
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547 // Print metaspace info for full GC with PrintGCDetails flag. |
0 | 548 if (complete) { |
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549 MetaspaceAux::print_metaspace_change(metadata_prev_used); |
0 | 550 } |
551 } | |
552 | |
553 for (int j = max_level_collected; j >= 0; j -= 1) { | |
554 // Adjust generation sizes. | |
555 _gens[j]->compute_new_size(); | |
556 } | |
557 | |
558 if (complete) { | |
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559 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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560 ClassLoaderDataGraph::purge(); |
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561 MetaspaceAux::verify_metrics(); |
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562 // Resize the metaspace capacity after full collections |
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563 MetaspaceGC::compute_new_size(); |
0 | 564 update_full_collections_completed(); |
565 } | |
566 | |
567 // Track memory usage and detect low memory after GC finishes | |
568 MemoryService::track_memory_usage(); | |
569 | |
570 gc_epilogue(complete); | |
571 | |
572 if (must_restore_marks_for_biased_locking) { | |
573 BiasedLocking::restore_marks(); | |
574 } | |
575 } | |
576 | |
577 AdaptiveSizePolicy* sp = gen_policy()->size_policy(); | |
578 AdaptiveSizePolicyOutput(sp, total_collections()); | |
579 | |
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580 print_heap_after_gc(); |
0 | 581 |
546
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582 #ifdef TRACESPINNING |
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583 ParallelTaskTerminator::print_termination_counts(); |
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584 #endif |
0 | 585 } |
586 | |
587 HeapWord* GenCollectedHeap::satisfy_failed_allocation(size_t size, bool is_tlab) { | |
588 return collector_policy()->satisfy_failed_allocation(size, is_tlab); | |
589 } | |
590 | |
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591 void GenCollectedHeap::set_par_threads(uint t) { |
0 | 592 SharedHeap::set_par_threads(t); |
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593 _gen_process_strong_tasks->set_n_threads(t); |
0 | 594 } |
595 | |
596 void GenCollectedHeap:: | |
597 gen_process_strong_roots(int level, | |
598 bool younger_gens_as_roots, | |
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599 bool activate_scope, |
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600 bool is_scavenging, |
0 | 601 SharedHeap::ScanningOption so, |
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602 OopsInGenClosure* not_older_gens, |
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603 bool do_code_roots, |
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604 OopsInGenClosure* older_gens, |
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605 KlassClosure* klass_closure) { |
0 | 606 // General strong roots. |
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607 |
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608 if (!do_code_roots) { |
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609 SharedHeap::process_strong_roots(activate_scope, is_scavenging, so, |
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610 not_older_gens, NULL, klass_closure); |
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611 } else { |
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612 bool do_code_marking = (activate_scope || nmethod::oops_do_marking_is_active()); |
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613 CodeBlobToOopClosure code_roots(not_older_gens, /*do_marking=*/ do_code_marking); |
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614 SharedHeap::process_strong_roots(activate_scope, is_scavenging, so, |
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615 not_older_gens, &code_roots, klass_closure); |
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616 } |
0 | 617 |
618 if (younger_gens_as_roots) { | |
619 if (!_gen_process_strong_tasks->is_task_claimed(GCH_PS_younger_gens)) { | |
620 for (int i = 0; i < level; i++) { | |
621 not_older_gens->set_generation(_gens[i]); | |
622 _gens[i]->oop_iterate(not_older_gens); | |
623 } | |
624 not_older_gens->reset_generation(); | |
625 } | |
626 } | |
627 // When collection is parallel, all threads get to cooperate to do | |
628 // older-gen scanning. | |
629 for (int i = level+1; i < _n_gens; i++) { | |
630 older_gens->set_generation(_gens[i]); | |
631 rem_set()->younger_refs_iterate(_gens[i], older_gens); | |
632 older_gens->reset_generation(); | |
633 } | |
634 | |
635 _gen_process_strong_tasks->all_tasks_completed(); | |
636 } | |
637 | |
638 void GenCollectedHeap::gen_process_weak_roots(OopClosure* root_closure, | |
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639 CodeBlobClosure* code_roots) { |
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640 SharedHeap::process_weak_roots(root_closure, code_roots); |
0 | 641 // "Local" "weak" refs |
642 for (int i = 0; i < _n_gens; i++) { | |
643 _gens[i]->ref_processor()->weak_oops_do(root_closure); | |
644 } | |
645 } | |
646 | |
647 #define GCH_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
648 void GenCollectedHeap:: \ | |
649 oop_since_save_marks_iterate(int level, \ | |
650 OopClosureType* cur, \ | |
651 OopClosureType* older) { \ | |
652 _gens[level]->oop_since_save_marks_iterate##nv_suffix(cur); \ | |
653 for (int i = level+1; i < n_gens(); i++) { \ | |
654 _gens[i]->oop_since_save_marks_iterate##nv_suffix(older); \ | |
655 } \ | |
656 } | |
657 | |
658 ALL_SINCE_SAVE_MARKS_CLOSURES(GCH_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
659 | |
660 #undef GCH_SINCE_SAVE_MARKS_ITERATE_DEFN | |
661 | |
662 bool GenCollectedHeap::no_allocs_since_save_marks(int level) { | |
663 for (int i = level; i < _n_gens; i++) { | |
664 if (!_gens[i]->no_allocs_since_save_marks()) return false; | |
665 } | |
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666 return true; |
0 | 667 } |
668 | |
669 bool GenCollectedHeap::supports_inline_contig_alloc() const { | |
670 return _gens[0]->supports_inline_contig_alloc(); | |
671 } | |
672 | |
673 HeapWord** GenCollectedHeap::top_addr() const { | |
674 return _gens[0]->top_addr(); | |
675 } | |
676 | |
677 HeapWord** GenCollectedHeap::end_addr() const { | |
678 return _gens[0]->end_addr(); | |
679 } | |
680 | |
681 size_t GenCollectedHeap::unsafe_max_alloc() { | |
682 return _gens[0]->unsafe_max_alloc_nogc(); | |
683 } | |
684 | |
685 // public collection interfaces | |
686 | |
687 void GenCollectedHeap::collect(GCCause::Cause cause) { | |
688 if (should_do_concurrent_full_gc(cause)) { | |
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689 #if INCLUDE_ALL_GCS |
0 | 690 // mostly concurrent full collection |
691 collect_mostly_concurrent(cause); | |
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692 #else // INCLUDE_ALL_GCS |
0 | 693 ShouldNotReachHere(); |
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694 #endif // INCLUDE_ALL_GCS |
0 | 695 } else { |
696 #ifdef ASSERT | |
697 if (cause == GCCause::_scavenge_alot) { | |
698 // minor collection only | |
699 collect(cause, 0); | |
700 } else { | |
701 // Stop-the-world full collection | |
702 collect(cause, n_gens() - 1); | |
703 } | |
704 #else | |
705 // Stop-the-world full collection | |
706 collect(cause, n_gens() - 1); | |
707 #endif | |
708 } | |
709 } | |
710 | |
711 void GenCollectedHeap::collect(GCCause::Cause cause, int max_level) { | |
712 // The caller doesn't have the Heap_lock | |
713 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
714 MutexLocker ml(Heap_lock); | |
715 collect_locked(cause, max_level); | |
716 } | |
717 | |
718 void GenCollectedHeap::collect_locked(GCCause::Cause cause) { | |
719 // The caller has the Heap_lock | |
720 assert(Heap_lock->owned_by_self(), "this thread should own the Heap_lock"); | |
721 collect_locked(cause, n_gens() - 1); | |
722 } | |
723 | |
724 // this is the private collection interface | |
725 // The Heap_lock is expected to be held on entry. | |
726 | |
727 void GenCollectedHeap::collect_locked(GCCause::Cause cause, int max_level) { | |
728 // Read the GC count while holding the Heap_lock | |
729 unsigned int gc_count_before = total_collections(); | |
730 unsigned int full_gc_count_before = total_full_collections(); | |
731 { | |
732 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
733 VM_GenCollectFull op(gc_count_before, full_gc_count_before, | |
734 cause, max_level); | |
735 VMThread::execute(&op); | |
736 } | |
737 } | |
738 | |
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739 #if INCLUDE_ALL_GCS |
0 | 740 bool GenCollectedHeap::create_cms_collector() { |
741 | |
742 assert(((_gens[1]->kind() == Generation::ConcurrentMarkSweep) || | |
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743 (_gens[1]->kind() == Generation::ASConcurrentMarkSweep)), |
0 | 744 "Unexpected generation kinds"); |
745 // Skip two header words in the block content verification | |
746 NOT_PRODUCT(_skip_header_HeapWords = CMSCollector::skip_header_HeapWords();) | |
747 CMSCollector* collector = new CMSCollector( | |
748 (ConcurrentMarkSweepGeneration*)_gens[1], | |
749 _rem_set->as_CardTableRS(), | |
750 (ConcurrentMarkSweepPolicy*) collector_policy()); | |
751 | |
752 if (collector == NULL || !collector->completed_initialization()) { | |
753 if (collector) { | |
754 delete collector; // Be nice in embedded situation | |
755 } | |
756 vm_shutdown_during_initialization("Could not create CMS collector"); | |
757 return false; | |
758 } | |
759 return true; // success | |
760 } | |
761 | |
762 void GenCollectedHeap::collect_mostly_concurrent(GCCause::Cause cause) { | |
763 assert(!Heap_lock->owned_by_self(), "Should not own Heap_lock"); | |
764 | |
765 MutexLocker ml(Heap_lock); | |
766 // Read the GC counts while holding the Heap_lock | |
767 unsigned int full_gc_count_before = total_full_collections(); | |
768 unsigned int gc_count_before = total_collections(); | |
769 { | |
770 MutexUnlocker mu(Heap_lock); | |
771 VM_GenCollectFullConcurrent op(gc_count_before, full_gc_count_before, cause); | |
772 VMThread::execute(&op); | |
773 } | |
774 } | |
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775 #endif // INCLUDE_ALL_GCS |
0 | 776 |
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777 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs) { |
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778 do_full_collection(clear_all_soft_refs, _n_gens - 1); |
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779 } |
0 | 780 |
781 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs, | |
782 int max_level) { | |
783 int local_max_level; | |
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784 if (!incremental_collection_will_fail(false /* don't consult_young */) && |
0 | 785 gc_cause() == GCCause::_gc_locker) { |
786 local_max_level = 0; | |
787 } else { | |
788 local_max_level = max_level; | |
789 } | |
790 | |
791 do_collection(true /* full */, | |
792 clear_all_soft_refs /* clear_all_soft_refs */, | |
793 0 /* size */, | |
794 false /* is_tlab */, | |
795 local_max_level /* max_level */); | |
796 // Hack XXX FIX ME !!! | |
797 // A scavenge may not have been attempted, or may have | |
798 // been attempted and failed, because the old gen was too full | |
799 if (local_max_level == 0 && gc_cause() == GCCause::_gc_locker && | |
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800 incremental_collection_will_fail(false /* don't consult_young */)) { |
0 | 801 if (PrintGCDetails) { |
802 gclog_or_tty->print_cr("GC locker: Trying a full collection " | |
803 "because scavenge failed"); | |
804 } | |
805 // This time allow the old gen to be collected as well | |
806 do_collection(true /* full */, | |
807 clear_all_soft_refs /* clear_all_soft_refs */, | |
808 0 /* size */, | |
809 false /* is_tlab */, | |
810 n_gens() - 1 /* max_level */); | |
811 } | |
812 } | |
813 | |
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814 bool GenCollectedHeap::is_in_young(oop p) { |
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815 bool result = ((HeapWord*)p) < _gens[_n_gens - 1]->reserved().start(); |
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816 assert(result == _gens[0]->is_in_reserved(p), |
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817 err_msg("incorrect test - result=%d, p=" PTR_FORMAT, result, p2i((void*)p))); |
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818 return result; |
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819 } |
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820 |
4708 | 821 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
0 | 822 bool GenCollectedHeap::is_in(const void* p) const { |
823 #ifndef ASSERT | |
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824 guarantee(VerifyBeforeGC || |
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825 VerifyDuringGC || |
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826 VerifyBeforeExit || |
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827 VerifyDuringStartup || |
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828 PrintAssembly || |
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829 tty->count() != 0 || // already printing |
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830 VerifyAfterGC || |
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831 VMError::fatal_error_in_progress(), "too expensive"); |
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832 |
0 | 833 #endif |
834 // This might be sped up with a cache of the last generation that | |
835 // answered yes. | |
836 for (int i = 0; i < _n_gens; i++) { | |
837 if (_gens[i]->is_in(p)) return true; | |
838 } | |
839 // Otherwise... | |
840 return false; | |
841 } | |
842 | |
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843 #ifdef ASSERT |
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844 // Don't implement this by using is_in_young(). This method is used |
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845 // in some cases to check that is_in_young() is correct. |
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846 bool GenCollectedHeap::is_in_partial_collection(const void* p) { |
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847 assert(is_in_reserved(p) || p == NULL, |
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848 "Does not work if address is non-null and outside of the heap"); |
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849 return p < _gens[_n_gens - 2]->reserved().end() && p != NULL; |
0 | 850 } |
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851 #endif |
0 | 852 |
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853 void GenCollectedHeap::oop_iterate(ExtendedOopClosure* cl) { |
0 | 854 for (int i = 0; i < _n_gens; i++) { |
855 _gens[i]->oop_iterate(cl); | |
856 } | |
857 } | |
858 | |
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859 void GenCollectedHeap::oop_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
0 | 860 for (int i = 0; i < _n_gens; i++) { |
861 _gens[i]->oop_iterate(mr, cl); | |
862 } | |
863 } | |
864 | |
865 void GenCollectedHeap::object_iterate(ObjectClosure* cl) { | |
866 for (int i = 0; i < _n_gens; i++) { | |
867 _gens[i]->object_iterate(cl); | |
868 } | |
869 } | |
870 | |
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871 void GenCollectedHeap::safe_object_iterate(ObjectClosure* cl) { |
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872 for (int i = 0; i < _n_gens; i++) { |
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873 _gens[i]->safe_object_iterate(cl); |
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874 } |
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875 } |
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876 |
0 | 877 Space* GenCollectedHeap::space_containing(const void* addr) const { |
878 for (int i = 0; i < _n_gens; i++) { | |
879 Space* res = _gens[i]->space_containing(addr); | |
880 if (res != NULL) return res; | |
881 } | |
882 // Otherwise... | |
883 assert(false, "Could not find containing space"); | |
884 return NULL; | |
885 } | |
886 | |
887 | |
888 HeapWord* GenCollectedHeap::block_start(const void* addr) const { | |
889 assert(is_in_reserved(addr), "block_start of address outside of heap"); | |
890 for (int i = 0; i < _n_gens; i++) { | |
891 if (_gens[i]->is_in_reserved(addr)) { | |
892 assert(_gens[i]->is_in(addr), | |
893 "addr should be in allocated part of generation"); | |
894 return _gens[i]->block_start(addr); | |
895 } | |
896 } | |
897 assert(false, "Some generation should contain the address"); | |
898 return NULL; | |
899 } | |
900 | |
901 size_t GenCollectedHeap::block_size(const HeapWord* addr) const { | |
902 assert(is_in_reserved(addr), "block_size of address outside of heap"); | |
903 for (int i = 0; i < _n_gens; i++) { | |
904 if (_gens[i]->is_in_reserved(addr)) { | |
905 assert(_gens[i]->is_in(addr), | |
906 "addr should be in allocated part of generation"); | |
907 return _gens[i]->block_size(addr); | |
908 } | |
909 } | |
910 assert(false, "Some generation should contain the address"); | |
911 return 0; | |
912 } | |
913 | |
914 bool GenCollectedHeap::block_is_obj(const HeapWord* addr) const { | |
915 assert(is_in_reserved(addr), "block_is_obj of address outside of heap"); | |
916 assert(block_start(addr) == addr, "addr must be a block start"); | |
917 for (int i = 0; i < _n_gens; i++) { | |
918 if (_gens[i]->is_in_reserved(addr)) { | |
919 return _gens[i]->block_is_obj(addr); | |
920 } | |
921 } | |
922 assert(false, "Some generation should contain the address"); | |
923 return false; | |
924 } | |
925 | |
926 bool GenCollectedHeap::supports_tlab_allocation() const { | |
927 for (int i = 0; i < _n_gens; i += 1) { | |
928 if (_gens[i]->supports_tlab_allocation()) { | |
929 return true; | |
930 } | |
931 } | |
932 return false; | |
933 } | |
934 | |
935 size_t GenCollectedHeap::tlab_capacity(Thread* thr) const { | |
936 size_t result = 0; | |
937 for (int i = 0; i < _n_gens; i += 1) { | |
938 if (_gens[i]->supports_tlab_allocation()) { | |
939 result += _gens[i]->tlab_capacity(); | |
940 } | |
941 } | |
942 return result; | |
943 } | |
944 | |
17727 | 945 size_t GenCollectedHeap::tlab_used(Thread* thr) const { |
946 size_t result = 0; | |
947 for (int i = 0; i < _n_gens; i += 1) { | |
948 if (_gens[i]->supports_tlab_allocation()) { | |
949 result += _gens[i]->tlab_used(); | |
950 } | |
951 } | |
952 return result; | |
953 } | |
954 | |
0 | 955 size_t GenCollectedHeap::unsafe_max_tlab_alloc(Thread* thr) const { |
956 size_t result = 0; | |
957 for (int i = 0; i < _n_gens; i += 1) { | |
958 if (_gens[i]->supports_tlab_allocation()) { | |
959 result += _gens[i]->unsafe_max_tlab_alloc(); | |
960 } | |
961 } | |
962 return result; | |
963 } | |
964 | |
965 HeapWord* GenCollectedHeap::allocate_new_tlab(size_t size) { | |
966 bool gc_overhead_limit_was_exceeded; | |
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967 return collector_policy()->mem_allocate_work(size /* size */, |
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968 true /* is_tlab */, |
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969 &gc_overhead_limit_was_exceeded); |
0 | 970 } |
971 | |
972 // Requires "*prev_ptr" to be non-NULL. Deletes and a block of minimal size | |
973 // from the list headed by "*prev_ptr". | |
974 static ScratchBlock *removeSmallestScratch(ScratchBlock **prev_ptr) { | |
975 bool first = true; | |
976 size_t min_size = 0; // "first" makes this conceptually infinite. | |
977 ScratchBlock **smallest_ptr, *smallest; | |
978 ScratchBlock *cur = *prev_ptr; | |
979 while (cur) { | |
980 assert(*prev_ptr == cur, "just checking"); | |
981 if (first || cur->num_words < min_size) { | |
982 smallest_ptr = prev_ptr; | |
983 smallest = cur; | |
984 min_size = smallest->num_words; | |
985 first = false; | |
986 } | |
987 prev_ptr = &cur->next; | |
988 cur = cur->next; | |
989 } | |
990 smallest = *smallest_ptr; | |
991 *smallest_ptr = smallest->next; | |
992 return smallest; | |
993 } | |
994 | |
995 // Sort the scratch block list headed by res into decreasing size order, | |
996 // and set "res" to the result. | |
997 static void sort_scratch_list(ScratchBlock*& list) { | |
998 ScratchBlock* sorted = NULL; | |
999 ScratchBlock* unsorted = list; | |
1000 while (unsorted) { | |
1001 ScratchBlock *smallest = removeSmallestScratch(&unsorted); | |
1002 smallest->next = sorted; | |
1003 sorted = smallest; | |
1004 } | |
1005 list = sorted; | |
1006 } | |
1007 | |
1008 ScratchBlock* GenCollectedHeap::gather_scratch(Generation* requestor, | |
1009 size_t max_alloc_words) { | |
1010 ScratchBlock* res = NULL; | |
1011 for (int i = 0; i < _n_gens; i++) { | |
1012 _gens[i]->contribute_scratch(res, requestor, max_alloc_words); | |
1013 } | |
1014 sort_scratch_list(res); | |
1015 return res; | |
1016 } | |
1017 | |
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1018 void GenCollectedHeap::release_scratch() { |
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1019 for (int i = 0; i < _n_gens; i++) { |
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1020 _gens[i]->reset_scratch(); |
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1021 } |
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1022 } |
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1023 |
0 | 1024 class GenPrepareForVerifyClosure: public GenCollectedHeap::GenClosure { |
1025 void do_generation(Generation* gen) { | |
1026 gen->prepare_for_verify(); | |
1027 } | |
1028 }; | |
1029 | |
1030 void GenCollectedHeap::prepare_for_verify() { | |
1031 ensure_parsability(false); // no need to retire TLABs | |
1032 GenPrepareForVerifyClosure blk; | |
1033 generation_iterate(&blk, false); | |
1034 } | |
1035 | |
1036 | |
1037 void GenCollectedHeap::generation_iterate(GenClosure* cl, | |
1038 bool old_to_young) { | |
1039 if (old_to_young) { | |
1040 for (int i = _n_gens-1; i >= 0; i--) { | |
1041 cl->do_generation(_gens[i]); | |
1042 } | |
1043 } else { | |
1044 for (int i = 0; i < _n_gens; i++) { | |
1045 cl->do_generation(_gens[i]); | |
1046 } | |
1047 } | |
1048 } | |
1049 | |
1050 void GenCollectedHeap::space_iterate(SpaceClosure* cl) { | |
1051 for (int i = 0; i < _n_gens; i++) { | |
1052 _gens[i]->space_iterate(cl, true); | |
1053 } | |
1054 } | |
1055 | |
1056 bool GenCollectedHeap::is_maximal_no_gc() const { | |
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1057 for (int i = 0; i < _n_gens; i++) { |
0 | 1058 if (!_gens[i]->is_maximal_no_gc()) { |
1059 return false; | |
1060 } | |
1061 } | |
1062 return true; | |
1063 } | |
1064 | |
1065 void GenCollectedHeap::save_marks() { | |
1066 for (int i = 0; i < _n_gens; i++) { | |
1067 _gens[i]->save_marks(); | |
1068 } | |
1069 } | |
1070 | |
1071 GenCollectedHeap* GenCollectedHeap::heap() { | |
1072 assert(_gch != NULL, "Uninitialized access to GenCollectedHeap::heap()"); | |
1073 assert(_gch->kind() == CollectedHeap::GenCollectedHeap, "not a generational heap"); | |
1074 return _gch; | |
1075 } | |
1076 | |
1077 | |
1078 void GenCollectedHeap::prepare_for_compaction() { | |
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1079 guarantee(_n_gens = 2, "Wrong number of generations"); |
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1080 Generation* old_gen = _gens[1]; |
0 | 1081 // Start by compacting into same gen. |
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1082 CompactPoint cp(old_gen, NULL, NULL); |
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1083 old_gen->prepare_for_compaction(&cp); |
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1084 Generation* young_gen = _gens[0]; |
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1085 young_gen->prepare_for_compaction(&cp); |
0 | 1086 } |
1087 | |
1088 GCStats* GenCollectedHeap::gc_stats(int level) const { | |
1089 return _gens[level]->gc_stats(); | |
1090 } | |
1091 | |
6008 | 1092 void GenCollectedHeap::verify(bool silent, VerifyOption option /* ignored */) { |
0 | 1093 for (int i = _n_gens-1; i >= 0; i--) { |
1094 Generation* g = _gens[i]; | |
1095 if (!silent) { | |
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1096 gclog_or_tty->print("%s", g->name()); |
0 | 1097 gclog_or_tty->print(" "); |
1098 } | |
6008 | 1099 g->verify(); |
0 | 1100 } |
1101 if (!silent) { | |
1102 gclog_or_tty->print("remset "); | |
1103 } | |
1104 rem_set()->verify(); | |
1105 } | |
1106 | |
1107 void GenCollectedHeap::print_on(outputStream* st) const { | |
1108 for (int i = 0; i < _n_gens; i++) { | |
1109 _gens[i]->print_on(st); | |
1110 } | |
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1111 MetaspaceAux::print_on(st); |
0 | 1112 } |
1113 | |
1114 void GenCollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
1115 if (workers() != NULL) { | |
1116 workers()->threads_do(tc); | |
1117 } | |
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1118 #if INCLUDE_ALL_GCS |
0 | 1119 if (UseConcMarkSweepGC) { |
1120 ConcurrentMarkSweepThread::threads_do(tc); | |
1121 } | |
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1122 #endif // INCLUDE_ALL_GCS |
0 | 1123 } |
1124 | |
1125 void GenCollectedHeap::print_gc_threads_on(outputStream* st) const { | |
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1126 #if INCLUDE_ALL_GCS |
0 | 1127 if (UseParNewGC) { |
1128 workers()->print_worker_threads_on(st); | |
1129 } | |
1130 if (UseConcMarkSweepGC) { | |
1131 ConcurrentMarkSweepThread::print_all_on(st); | |
1132 } | |
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1133 #endif // INCLUDE_ALL_GCS |
0 | 1134 } |
1135 | |
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1136 void GenCollectedHeap::print_on_error(outputStream* st) const { |
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1137 this->CollectedHeap::print_on_error(st); |
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1138 |
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1139 #if INCLUDE_ALL_GCS |
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1140 if (UseConcMarkSweepGC) { |
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1141 st->cr(); |
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1142 CMSCollector::print_on_error(st); |
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1143 } |
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1144 #endif // INCLUDE_ALL_GCS |
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1145 } |
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1146 |
0 | 1147 void GenCollectedHeap::print_tracing_info() const { |
1148 if (TraceGen0Time) { | |
1149 get_gen(0)->print_summary_info(); | |
1150 } | |
1151 if (TraceGen1Time) { | |
1152 get_gen(1)->print_summary_info(); | |
1153 } | |
1154 } | |
1155 | |
1156 void GenCollectedHeap::print_heap_change(size_t prev_used) const { | |
1157 if (PrintGCDetails && Verbose) { | |
1158 gclog_or_tty->print(" " SIZE_FORMAT | |
1159 "->" SIZE_FORMAT | |
1160 "(" SIZE_FORMAT ")", | |
1161 prev_used, used(), capacity()); | |
1162 } else { | |
1163 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
1164 "->" SIZE_FORMAT "K" | |
1165 "(" SIZE_FORMAT "K)", | |
1166 prev_used / K, used() / K, capacity() / K); | |
1167 } | |
1168 } | |
1169 | |
1170 class GenGCPrologueClosure: public GenCollectedHeap::GenClosure { | |
1171 private: | |
1172 bool _full; | |
1173 public: | |
1174 void do_generation(Generation* gen) { | |
1175 gen->gc_prologue(_full); | |
1176 } | |
1177 GenGCPrologueClosure(bool full) : _full(full) {}; | |
1178 }; | |
1179 | |
1180 void GenCollectedHeap::gc_prologue(bool full) { | |
1181 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
1182 | |
1183 always_do_update_barrier = false; | |
1184 // Fill TLAB's and such | |
1185 CollectedHeap::accumulate_statistics_all_tlabs(); | |
1186 ensure_parsability(true); // retire TLABs | |
1187 | |
1188 // Walk generations | |
1189 GenGCPrologueClosure blk(full); | |
1190 generation_iterate(&blk, false); // not old-to-young. | |
1191 }; | |
1192 | |
1193 class GenGCEpilogueClosure: public GenCollectedHeap::GenClosure { | |
1194 private: | |
1195 bool _full; | |
1196 public: | |
1197 void do_generation(Generation* gen) { | |
1198 gen->gc_epilogue(_full); | |
1199 } | |
1200 GenGCEpilogueClosure(bool full) : _full(full) {}; | |
1201 }; | |
1202 | |
1203 void GenCollectedHeap::gc_epilogue(bool full) { | |
1204 #ifdef COMPILER2 | |
1205 assert(DerivedPointerTable::is_empty(), "derived pointer present"); | |
1206 size_t actual_gap = pointer_delta((HeapWord*) (max_uintx-3), *(end_addr())); | |
1207 guarantee(actual_gap > (size_t)FastAllocateSizeLimit, "inline allocation wraps"); | |
1208 #endif /* COMPILER2 */ | |
1209 | |
1210 resize_all_tlabs(); | |
1211 | |
1212 GenGCEpilogueClosure blk(full); | |
1213 generation_iterate(&blk, false); // not old-to-young. | |
1214 | |
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1215 if (!CleanChunkPoolAsync) { |
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1216 Chunk::clean_chunk_pool(); |
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1217 } |
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1218 |
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1219 MetaspaceCounters::update_performance_counters(); |
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1220 CompressedClassSpaceCounters::update_performance_counters(); |
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1221 |
0 | 1222 always_do_update_barrier = UseConcMarkSweepGC; |
1223 }; | |
1224 | |
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1225 #ifndef PRODUCT |
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1226 class GenGCSaveTopsBeforeGCClosure: public GenCollectedHeap::GenClosure { |
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1227 private: |
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1228 public: |
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1229 void do_generation(Generation* gen) { |
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1230 gen->record_spaces_top(); |
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1231 } |
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1232 }; |
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1233 |
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1234 void GenCollectedHeap::record_gen_tops_before_GC() { |
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1235 if (ZapUnusedHeapArea) { |
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1236 GenGCSaveTopsBeforeGCClosure blk; |
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1237 generation_iterate(&blk, false); // not old-to-young. |
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1238 } |
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1239 } |
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1240 #endif // not PRODUCT |
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1241 |
0 | 1242 class GenEnsureParsabilityClosure: public GenCollectedHeap::GenClosure { |
1243 public: | |
1244 void do_generation(Generation* gen) { | |
1245 gen->ensure_parsability(); | |
1246 } | |
1247 }; | |
1248 | |
1249 void GenCollectedHeap::ensure_parsability(bool retire_tlabs) { | |
1250 CollectedHeap::ensure_parsability(retire_tlabs); | |
1251 GenEnsureParsabilityClosure ep_cl; | |
1252 generation_iterate(&ep_cl, false); | |
1253 } | |
1254 | |
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1255 oop GenCollectedHeap::handle_failed_promotion(Generation* old_gen, |
0 | 1256 oop obj, |
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1257 size_t obj_size) { |
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1258 guarantee(old_gen->level() == 1, "We only get here with an old generation"); |
0 | 1259 assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
1260 HeapWord* result = NULL; | |
1261 | |
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1262 result = old_gen->expand_and_allocate(obj_size, false); |
0 | 1263 |
1264 if (result != NULL) { | |
1265 Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); | |
1266 } | |
1267 return oop(result); | |
1268 } | |
1269 | |
1270 class GenTimeOfLastGCClosure: public GenCollectedHeap::GenClosure { | |
1271 jlong _time; // in ms | |
1272 jlong _now; // in ms | |
1273 | |
1274 public: | |
1275 GenTimeOfLastGCClosure(jlong now) : _time(now), _now(now) { } | |
1276 | |
1277 jlong time() { return _time; } | |
1278 | |
1279 void do_generation(Generation* gen) { | |
1280 _time = MIN2(_time, gen->time_of_last_gc(_now)); | |
1281 } | |
1282 }; | |
1283 | |
1284 jlong GenCollectedHeap::millis_since_last_gc() { | |
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1285 // We need a monotonically non-deccreasing time in ms but |
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1286 // os::javaTimeMillis() does not guarantee monotonicity. |
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1287 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 1288 GenTimeOfLastGCClosure tolgc_cl(now); |
1289 // iterate over generations getting the oldest | |
1290 // time that a generation was collected | |
1291 generation_iterate(&tolgc_cl, false); | |
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1292 |
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1293 // javaTimeNanos() is guaranteed to be monotonically non-decreasing |
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1294 // provided the underlying platform provides such a time source |
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1295 // (and it is bug free). So we still have to guard against getting |
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1296 // back a time later than 'now'. |
0 | 1297 jlong retVal = now - tolgc_cl.time(); |
1298 if (retVal < 0) { | |
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1299 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, (int64_t) retVal);) |
0 | 1300 return 0; |
1301 } | |
1302 return retVal; | |
1303 } |