Mercurial > hg > truffle
annotate src/share/vm/memory/genCollectedHeap.cpp @ 10242:b0d20fa374b4
8013872: G1: HeapRegionSeq::shrink_by() has invalid assert
Summary: Refactored shrink_by() to only use region counts and not byte sizes
Reviewed-by: johnc, tschatzl
author | brutisso |
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date | Mon, 06 May 2013 21:30:34 +0200 |
parents | b06ac540229e |
children | f2110083203d |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "code/icBuffer.hpp" | |
30 #include "gc_implementation/shared/collectorCounters.hpp" | |
31 #include "gc_implementation/shared/vmGCOperations.hpp" | |
32 #include "gc_interface/collectedHeap.inline.hpp" | |
33 #include "memory/filemap.hpp" | |
34 #include "memory/gcLocker.inline.hpp" | |
35 #include "memory/genCollectedHeap.hpp" | |
36 #include "memory/genOopClosures.inline.hpp" | |
37 #include "memory/generation.inline.hpp" | |
38 #include "memory/generationSpec.hpp" | |
39 #include "memory/resourceArea.hpp" | |
40 #include "memory/sharedHeap.hpp" | |
41 #include "memory/space.hpp" | |
42 #include "oops/oop.inline.hpp" | |
43 #include "oops/oop.inline2.hpp" | |
44 #include "runtime/aprofiler.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. | |
98 size_t alignment = Generation::GenGrain; | |
99 | |
100 _gen_specs = gen_policy()->generations(); | |
101 | |
102 // Make sure the sizes are all aligned. | |
103 for (i = 0; i < _n_gens; i++) { | |
104 _gen_specs[i]->align(alignment); | |
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; | |
112 ReservedSpace heap_rs(0); | |
113 | |
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114 heap_address = allocate(alignment, &total_reserved, |
0 | 115 &n_covered_regions, &heap_rs); |
116 | |
117 if (!heap_rs.is_reserved()) { | |
118 vm_shutdown_during_initialization( | |
119 "Could not reserve enough space for object heap"); | |
120 return JNI_ENOMEM; | |
121 } | |
122 | |
123 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
124 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
125 | |
126 // It is important to do this in a way such that concurrent readers can't | |
127 // temporarily think somethings in the heap. (Seen this happen in asserts.) | |
128 _reserved.set_word_size(0); | |
129 _reserved.set_start((HeapWord*)heap_rs.base()); | |
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130 size_t actual_heap_size = heap_rs.size(); |
0 | 131 _reserved.set_end((HeapWord*)(heap_rs.base() + actual_heap_size)); |
132 | |
133 _rem_set = collector_policy()->create_rem_set(_reserved, n_covered_regions); | |
134 set_barrier_set(rem_set()->bs()); | |
1166 | 135 |
0 | 136 _gch = this; |
137 | |
138 for (i = 0; i < _n_gens; i++) { | |
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139 ReservedSpace this_rs = heap_rs.first_part(_gen_specs[i]->max_size(), false, false); |
0 | 140 _gens[i] = _gen_specs[i]->init(this_rs, i, rem_set()); |
141 heap_rs = heap_rs.last_part(_gen_specs[i]->max_size()); | |
142 } | |
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143 clear_incremental_collection_failed(); |
0 | 144 |
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145 #if INCLUDE_ALL_GCS |
0 | 146 // If we are running CMS, create the collector responsible |
147 // for collecting the CMS generations. | |
148 if (collector_policy()->is_concurrent_mark_sweep_policy()) { | |
149 bool success = create_cms_collector(); | |
150 if (!success) return JNI_ENOMEM; | |
151 } | |
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152 #endif // INCLUDE_ALL_GCS |
0 | 153 |
154 return JNI_OK; | |
155 } | |
156 | |
157 | |
158 char* GenCollectedHeap::allocate(size_t alignment, | |
159 size_t* _total_reserved, | |
160 int* _n_covered_regions, | |
161 ReservedSpace* heap_rs){ | |
162 const char overflow_msg[] = "The size of the object heap + VM data exceeds " | |
163 "the maximum representable size"; | |
164 | |
165 // Now figure out the total size. | |
166 size_t total_reserved = 0; | |
167 int n_covered_regions = 0; | |
168 const size_t pageSize = UseLargePages ? | |
169 os::large_page_size() : os::vm_page_size(); | |
170 | |
171 for (int i = 0; i < _n_gens; i++) { | |
172 total_reserved += _gen_specs[i]->max_size(); | |
173 if (total_reserved < _gen_specs[i]->max_size()) { | |
174 vm_exit_during_initialization(overflow_msg); | |
175 } | |
176 n_covered_regions += _gen_specs[i]->n_covered_regions(); | |
177 } | |
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178 assert(total_reserved % pageSize == 0, |
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179 err_msg("Gen size; total_reserved=" SIZE_FORMAT ", pageSize=" |
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180 SIZE_FORMAT, total_reserved, pageSize)); |
0 | 181 |
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182 // Needed until the cardtable is fixed to have the right number |
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183 // of covered regions. |
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184 n_covered_regions += 2; |
0 | 185 |
186 if (UseLargePages) { | |
187 assert(total_reserved != 0, "total_reserved cannot be 0"); | |
188 total_reserved = round_to(total_reserved, os::large_page_size()); | |
189 if (total_reserved < os::large_page_size()) { | |
190 vm_exit_during_initialization(overflow_msg); | |
191 } | |
192 } | |
193 | |
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194 *_total_reserved = total_reserved; |
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195 *_n_covered_regions = n_covered_regions; |
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196 *heap_rs = Universe::reserve_heap(total_reserved, alignment); |
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197 return heap_rs->base(); |
0 | 198 } |
199 | |
200 | |
201 void GenCollectedHeap::post_initialize() { | |
202 SharedHeap::post_initialize(); | |
203 TwoGenerationCollectorPolicy *policy = | |
204 (TwoGenerationCollectorPolicy *)collector_policy(); | |
205 guarantee(policy->is_two_generation_policy(), "Illegal policy type"); | |
206 DefNewGeneration* def_new_gen = (DefNewGeneration*) get_gen(0); | |
207 assert(def_new_gen->kind() == Generation::DefNew || | |
208 def_new_gen->kind() == Generation::ParNew || | |
209 def_new_gen->kind() == Generation::ASParNew, | |
210 "Wrong generation kind"); | |
211 | |
212 Generation* old_gen = get_gen(1); | |
213 assert(old_gen->kind() == Generation::ConcurrentMarkSweep || | |
214 old_gen->kind() == Generation::ASConcurrentMarkSweep || | |
215 old_gen->kind() == Generation::MarkSweepCompact, | |
216 "Wrong generation kind"); | |
217 | |
218 policy->initialize_size_policy(def_new_gen->eden()->capacity(), | |
219 old_gen->capacity(), | |
220 def_new_gen->from()->capacity()); | |
221 policy->initialize_gc_policy_counters(); | |
222 } | |
223 | |
224 void GenCollectedHeap::ref_processing_init() { | |
225 SharedHeap::ref_processing_init(); | |
226 for (int i = 0; i < _n_gens; i++) { | |
227 _gens[i]->ref_processor_init(); | |
228 } | |
229 } | |
230 | |
231 size_t GenCollectedHeap::capacity() const { | |
232 size_t res = 0; | |
233 for (int i = 0; i < _n_gens; i++) { | |
234 res += _gens[i]->capacity(); | |
235 } | |
236 return res; | |
237 } | |
238 | |
239 size_t GenCollectedHeap::used() const { | |
240 size_t res = 0; | |
241 for (int i = 0; i < _n_gens; i++) { | |
242 res += _gens[i]->used(); | |
243 } | |
244 return res; | |
245 } | |
246 | |
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247 // Save the "used_region" for generations level and lower. |
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248 void GenCollectedHeap::save_used_regions(int level) { |
0 | 249 assert(level < _n_gens, "Illegal level parameter"); |
250 for (int i = level; i >= 0; i--) { | |
251 _gens[i]->save_used_region(); | |
252 } | |
253 } | |
254 | |
255 size_t GenCollectedHeap::max_capacity() const { | |
256 size_t res = 0; | |
257 for (int i = 0; i < _n_gens; i++) { | |
258 res += _gens[i]->max_capacity(); | |
259 } | |
260 return res; | |
261 } | |
262 | |
263 // Update the _full_collections_completed counter | |
264 // at the end of a stop-world full GC. | |
265 unsigned int GenCollectedHeap::update_full_collections_completed() { | |
266 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
267 assert(_full_collections_completed <= _total_full_collections, | |
268 "Can't complete more collections than were started"); | |
269 _full_collections_completed = _total_full_collections; | |
270 ml.notify_all(); | |
271 return _full_collections_completed; | |
272 } | |
273 | |
274 // Update the _full_collections_completed counter, as appropriate, | |
275 // at the end of a concurrent GC cycle. Note the conditional update | |
276 // below to allow this method to be called by a concurrent collector | |
277 // without synchronizing in any manner with the VM thread (which | |
278 // may already have initiated a STW full collection "concurrently"). | |
279 unsigned int GenCollectedHeap::update_full_collections_completed(unsigned int count) { | |
280 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
281 assert((_full_collections_completed <= _total_full_collections) && | |
282 (count <= _total_full_collections), | |
283 "Can't complete more collections than were started"); | |
284 if (count > _full_collections_completed) { | |
285 _full_collections_completed = count; | |
286 ml.notify_all(); | |
287 } | |
288 return _full_collections_completed; | |
289 } | |
290 | |
291 | |
292 #ifndef PRODUCT | |
293 // Override of memory state checking method in CollectedHeap: | |
294 // Some collectors (CMS for example) can't have badHeapWordVal written | |
295 // in the first two words of an object. (For instance , in the case of | |
296 // CMS these words hold state used to synchronize between certain | |
297 // (concurrent) GC steps and direct allocating mutators.) | |
298 // The skip_header_HeapWords() method below, allows us to skip | |
299 // over the requisite number of HeapWord's. Note that (for | |
300 // generational collectors) this means that those many words are | |
301 // skipped in each object, irrespective of the generation in which | |
302 // that object lives. The resultant loss of precision seems to be | |
303 // harmless and the pain of avoiding that imprecision appears somewhat | |
304 // higher than we are prepared to pay for such rudimentary debugging | |
305 // support. | |
306 void GenCollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, | |
307 size_t size) { | |
308 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
309 // We are asked to check a size in HeapWords, | |
310 // but the memory is mangled in juint words. | |
311 juint* start = (juint*) (addr + skip_header_HeapWords()); | |
312 juint* end = (juint*) (addr + size); | |
313 for (juint* slot = start; slot < end; slot += 1) { | |
314 assert(*slot == badHeapWordVal, | |
315 "Found non badHeapWordValue in pre-allocation check"); | |
316 } | |
317 } | |
318 } | |
319 #endif | |
320 | |
321 HeapWord* GenCollectedHeap::attempt_allocation(size_t size, | |
322 bool is_tlab, | |
323 bool first_only) { | |
324 HeapWord* res; | |
325 for (int i = 0; i < _n_gens; i++) { | |
326 if (_gens[i]->should_allocate(size, is_tlab)) { | |
327 res = _gens[i]->allocate(size, is_tlab); | |
328 if (res != NULL) return res; | |
329 else if (first_only) break; | |
330 } | |
331 } | |
332 // Otherwise... | |
333 return NULL; | |
334 } | |
335 | |
336 HeapWord* GenCollectedHeap::mem_allocate(size_t size, | |
337 bool* gc_overhead_limit_was_exceeded) { | |
338 return collector_policy()->mem_allocate_work(size, | |
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339 false /* is_tlab */, |
0 | 340 gc_overhead_limit_was_exceeded); |
341 } | |
342 | |
343 bool GenCollectedHeap::must_clear_all_soft_refs() { | |
344 return _gc_cause == GCCause::_last_ditch_collection; | |
345 } | |
346 | |
347 bool GenCollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { | |
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348 return UseConcMarkSweepGC && |
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349 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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350 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
0 | 351 } |
352 | |
353 void GenCollectedHeap::do_collection(bool full, | |
354 bool clear_all_soft_refs, | |
355 size_t size, | |
356 bool is_tlab, | |
357 int max_level) { | |
358 bool prepared_for_verification = false; | |
359 ResourceMark rm; | |
360 DEBUG_ONLY(Thread* my_thread = Thread::current();) | |
361 | |
362 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
363 assert(my_thread->is_VM_thread() || | |
364 my_thread->is_ConcurrentGC_thread(), | |
365 "incorrect thread type capability"); | |
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366 assert(Heap_lock->is_locked(), |
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367 "the requesting thread should have the Heap_lock"); |
0 | 368 guarantee(!is_gc_active(), "collection is not reentrant"); |
369 assert(max_level < n_gens(), "sanity check"); | |
370 | |
371 if (GC_locker::check_active_before_gc()) { | |
372 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
373 } | |
374 | |
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375 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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376 collector_policy()->should_clear_all_soft_refs(); |
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377 |
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378 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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379 |
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380 const size_t metadata_prev_used = MetaspaceAux::allocated_used_bytes(); |
0 | 381 |
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382 print_heap_before_gc(); |
0 | 383 |
384 { | |
385 FlagSetting fl(_is_gc_active, true); | |
386 | |
387 bool complete = full && (max_level == (n_gens()-1)); | |
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388 const char* gc_cause_prefix = complete ? "Full GC" : "GC"; |
0 | 389 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
390 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
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391 TraceTime t(GCCauseString(gc_cause_prefix, gc_cause()), PrintGCDetails, false, gclog_or_tty); |
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 } |
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420 pre_full_gc_dump(); // do any pre full gc dumps |
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421 } |
0 | 422 // Timer for individual generations. Last argument is false: no CR |
423 TraceTime t1(_gens[i]->short_name(), PrintGCDetails, false, gclog_or_tty); | |
424 TraceCollectorStats tcs(_gens[i]->counters()); | |
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425 TraceMemoryManagerStats tmms(_gens[i]->kind(),gc_cause()); |
0 | 426 |
427 size_t prev_used = _gens[i]->used(); | |
428 _gens[i]->stat_record()->invocations++; | |
429 _gens[i]->stat_record()->accumulated_time.start(); | |
430 | |
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431 // Must be done anew before each collection because |
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432 // a previous collection will do mangling and will |
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433 // change top of some spaces. |
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434 record_gen_tops_before_GC(); |
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435 |
0 | 436 if (PrintGC && Verbose) { |
437 gclog_or_tty->print("level=%d invoke=%d size=" SIZE_FORMAT, | |
438 i, | |
439 _gens[i]->stat_record()->invocations, | |
440 size*HeapWordSize); | |
441 } | |
442 | |
443 if (VerifyBeforeGC && i >= VerifyGCLevel && | |
444 total_collections() >= VerifyGCStartAt) { | |
445 HandleMark hm; // Discard invalid handles created during verification | |
446 if (!prepared_for_verification) { | |
447 prepare_for_verify(); | |
448 prepared_for_verification = true; | |
449 } | |
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450 Universe::verify(" VerifyBeforeGC:"); |
0 | 451 } |
452 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
453 | |
454 if (!must_restore_marks_for_biased_locking && | |
455 _gens[i]->performs_in_place_marking()) { | |
456 // We perform this mark word preservation work lazily | |
457 // because it's only at this point that we know whether we | |
458 // absolutely have to do it; we want to avoid doing it for | |
459 // scavenge-only collections where it's unnecessary | |
460 must_restore_marks_for_biased_locking = true; | |
461 BiasedLocking::preserve_marks(); | |
462 } | |
463 | |
464 // Do collection work | |
465 { | |
466 // Note on ref discovery: For what appear to be historical reasons, | |
467 // GCH enables and disabled (by enqueing) refs discovery. | |
468 // In the future this should be moved into the generation's | |
469 // collect method so that ref discovery and enqueueing concerns | |
470 // are local to a generation. The collect method could return | |
471 // an appropriate indication in the case that notification on | |
472 // the ref lock was needed. This will make the treatment of | |
473 // weak refs more uniform (and indeed remove such concerns | |
474 // from GCH). XXX | |
475 | |
476 HandleMark hm; // Discard invalid handles created during gc | |
477 save_marks(); // save marks for all gens | |
478 // We want to discover references, but not process them yet. | |
479 // This mode is disabled in process_discovered_references if the | |
480 // generation does some collection work, or in | |
481 // enqueue_discovered_references if the generation returns | |
482 // without doing any work. | |
483 ReferenceProcessor* rp = _gens[i]->ref_processor(); | |
484 // If the discovery of ("weak") refs in this generation is | |
485 // atomic wrt other collectors in this configuration, we | |
486 // are guaranteed to have empty discovered ref lists. | |
487 if (rp->discovery_is_atomic()) { | |
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488 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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489 rp->setup_policy(do_clear_all_soft_refs); |
0 | 490 } else { |
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491 // collect() below will enable discovery as appropriate |
0 | 492 } |
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493 _gens[i]->collect(full, do_clear_all_soft_refs, size, is_tlab); |
0 | 494 if (!rp->enqueuing_is_done()) { |
495 rp->enqueue_discovered_references(); | |
496 } else { | |
497 rp->set_enqueuing_is_done(false); | |
498 } | |
499 rp->verify_no_references_recorded(); | |
500 } | |
501 max_level_collected = i; | |
502 | |
503 // Determine if allocation request was met. | |
504 if (size > 0) { | |
505 if (!is_tlab || _gens[i]->supports_tlab_allocation()) { | |
506 if (size*HeapWordSize <= _gens[i]->unsafe_max_alloc_nogc()) { | |
507 size = 0; | |
508 } | |
509 } | |
510 } | |
511 | |
512 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
513 | |
514 _gens[i]->stat_record()->accumulated_time.stop(); | |
515 | |
516 update_gc_stats(i, full); | |
517 | |
518 if (VerifyAfterGC && i >= VerifyGCLevel && | |
519 total_collections() >= VerifyGCStartAt) { | |
520 HandleMark hm; // Discard invalid handles created during verification | |
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521 Universe::verify(" VerifyAfterGC:"); |
0 | 522 } |
523 | |
524 if (PrintGCDetails) { | |
525 gclog_or_tty->print(":"); | |
526 _gens[i]->print_heap_change(prev_used); | |
527 } | |
528 } | |
529 } | |
530 | |
531 // Update "complete" boolean wrt what actually transpired -- | |
532 // for instance, a promotion failure could have led to | |
533 // a whole heap collection. | |
534 complete = complete || (max_level_collected == n_gens() - 1); | |
535 | |
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536 if (complete) { // We did a "major" collection |
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537 post_full_gc_dump(); // do any post full gc dumps |
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538 } |
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539 |
0 | 540 if (PrintGCDetails) { |
541 print_heap_change(gch_prev_used); | |
542 | |
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543 // Print metaspace info for full GC with PrintGCDetails flag. |
0 | 544 if (complete) { |
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545 MetaspaceAux::print_metaspace_change(metadata_prev_used); |
0 | 546 } |
547 } | |
548 | |
549 for (int j = max_level_collected; j >= 0; j -= 1) { | |
550 // Adjust generation sizes. | |
551 _gens[j]->compute_new_size(); | |
552 } | |
553 | |
554 if (complete) { | |
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555 // Delete metaspaces for unloaded class loaders and clean up loader_data graph |
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556 ClassLoaderDataGraph::purge(); |
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557 MetaspaceAux::verify_metrics(); |
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558 // Resize the metaspace capacity after full collections |
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559 MetaspaceGC::compute_new_size(); |
0 | 560 update_full_collections_completed(); |
561 } | |
562 | |
563 // Track memory usage and detect low memory after GC finishes | |
564 MemoryService::track_memory_usage(); | |
565 | |
566 gc_epilogue(complete); | |
567 | |
568 if (must_restore_marks_for_biased_locking) { | |
569 BiasedLocking::restore_marks(); | |
570 } | |
571 } | |
572 | |
573 AdaptiveSizePolicy* sp = gen_policy()->size_policy(); | |
574 AdaptiveSizePolicyOutput(sp, total_collections()); | |
575 | |
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576 print_heap_after_gc(); |
0 | 577 |
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578 #ifdef TRACESPINNING |
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579 ParallelTaskTerminator::print_termination_counts(); |
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580 #endif |
0 | 581 } |
582 | |
583 HeapWord* GenCollectedHeap::satisfy_failed_allocation(size_t size, bool is_tlab) { | |
584 return collector_policy()->satisfy_failed_allocation(size, is_tlab); | |
585 } | |
586 | |
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587 void GenCollectedHeap::set_par_threads(uint t) { |
0 | 588 SharedHeap::set_par_threads(t); |
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589 _gen_process_strong_tasks->set_n_threads(t); |
0 | 590 } |
591 | |
592 void GenCollectedHeap:: | |
593 gen_process_strong_roots(int level, | |
594 bool younger_gens_as_roots, | |
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595 bool activate_scope, |
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596 bool is_scavenging, |
0 | 597 SharedHeap::ScanningOption so, |
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598 OopsInGenClosure* not_older_gens, |
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599 bool do_code_roots, |
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600 OopsInGenClosure* older_gens, |
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601 KlassClosure* klass_closure) { |
0 | 602 // General strong roots. |
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603 |
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604 if (!do_code_roots) { |
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605 SharedHeap::process_strong_roots(activate_scope, is_scavenging, so, |
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606 not_older_gens, NULL, klass_closure); |
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607 } else { |
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608 bool do_code_marking = (activate_scope || nmethod::oops_do_marking_is_active()); |
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609 CodeBlobToOopClosure code_roots(not_older_gens, /*do_marking=*/ do_code_marking); |
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610 SharedHeap::process_strong_roots(activate_scope, is_scavenging, so, |
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611 not_older_gens, &code_roots, klass_closure); |
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612 } |
0 | 613 |
614 if (younger_gens_as_roots) { | |
615 if (!_gen_process_strong_tasks->is_task_claimed(GCH_PS_younger_gens)) { | |
616 for (int i = 0; i < level; i++) { | |
617 not_older_gens->set_generation(_gens[i]); | |
618 _gens[i]->oop_iterate(not_older_gens); | |
619 } | |
620 not_older_gens->reset_generation(); | |
621 } | |
622 } | |
623 // When collection is parallel, all threads get to cooperate to do | |
624 // older-gen scanning. | |
625 for (int i = level+1; i < _n_gens; i++) { | |
626 older_gens->set_generation(_gens[i]); | |
627 rem_set()->younger_refs_iterate(_gens[i], older_gens); | |
628 older_gens->reset_generation(); | |
629 } | |
630 | |
631 _gen_process_strong_tasks->all_tasks_completed(); | |
632 } | |
633 | |
634 void GenCollectedHeap::gen_process_weak_roots(OopClosure* root_closure, | |
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635 CodeBlobClosure* code_roots) { |
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636 SharedHeap::process_weak_roots(root_closure, code_roots); |
0 | 637 // "Local" "weak" refs |
638 for (int i = 0; i < _n_gens; i++) { | |
639 _gens[i]->ref_processor()->weak_oops_do(root_closure); | |
640 } | |
641 } | |
642 | |
643 #define GCH_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
644 void GenCollectedHeap:: \ | |
645 oop_since_save_marks_iterate(int level, \ | |
646 OopClosureType* cur, \ | |
647 OopClosureType* older) { \ | |
648 _gens[level]->oop_since_save_marks_iterate##nv_suffix(cur); \ | |
649 for (int i = level+1; i < n_gens(); i++) { \ | |
650 _gens[i]->oop_since_save_marks_iterate##nv_suffix(older); \ | |
651 } \ | |
652 } | |
653 | |
654 ALL_SINCE_SAVE_MARKS_CLOSURES(GCH_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
655 | |
656 #undef GCH_SINCE_SAVE_MARKS_ITERATE_DEFN | |
657 | |
658 bool GenCollectedHeap::no_allocs_since_save_marks(int level) { | |
659 for (int i = level; i < _n_gens; i++) { | |
660 if (!_gens[i]->no_allocs_since_save_marks()) return false; | |
661 } | |
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662 return true; |
0 | 663 } |
664 | |
665 bool GenCollectedHeap::supports_inline_contig_alloc() const { | |
666 return _gens[0]->supports_inline_contig_alloc(); | |
667 } | |
668 | |
669 HeapWord** GenCollectedHeap::top_addr() const { | |
670 return _gens[0]->top_addr(); | |
671 } | |
672 | |
673 HeapWord** GenCollectedHeap::end_addr() const { | |
674 return _gens[0]->end_addr(); | |
675 } | |
676 | |
677 size_t GenCollectedHeap::unsafe_max_alloc() { | |
678 return _gens[0]->unsafe_max_alloc_nogc(); | |
679 } | |
680 | |
681 // public collection interfaces | |
682 | |
683 void GenCollectedHeap::collect(GCCause::Cause cause) { | |
684 if (should_do_concurrent_full_gc(cause)) { | |
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685 #if INCLUDE_ALL_GCS |
0 | 686 // mostly concurrent full collection |
687 collect_mostly_concurrent(cause); | |
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688 #else // INCLUDE_ALL_GCS |
0 | 689 ShouldNotReachHere(); |
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690 #endif // INCLUDE_ALL_GCS |
0 | 691 } else { |
692 #ifdef ASSERT | |
693 if (cause == GCCause::_scavenge_alot) { | |
694 // minor collection only | |
695 collect(cause, 0); | |
696 } else { | |
697 // Stop-the-world full collection | |
698 collect(cause, n_gens() - 1); | |
699 } | |
700 #else | |
701 // Stop-the-world full collection | |
702 collect(cause, n_gens() - 1); | |
703 #endif | |
704 } | |
705 } | |
706 | |
707 void GenCollectedHeap::collect(GCCause::Cause cause, int max_level) { | |
708 // The caller doesn't have the Heap_lock | |
709 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
710 MutexLocker ml(Heap_lock); | |
711 collect_locked(cause, max_level); | |
712 } | |
713 | |
714 void GenCollectedHeap::collect_locked(GCCause::Cause cause) { | |
715 // The caller has the Heap_lock | |
716 assert(Heap_lock->owned_by_self(), "this thread should own the Heap_lock"); | |
717 collect_locked(cause, n_gens() - 1); | |
718 } | |
719 | |
720 // this is the private collection interface | |
721 // The Heap_lock is expected to be held on entry. | |
722 | |
723 void GenCollectedHeap::collect_locked(GCCause::Cause cause, int max_level) { | |
724 // Read the GC count while holding the Heap_lock | |
725 unsigned int gc_count_before = total_collections(); | |
726 unsigned int full_gc_count_before = total_full_collections(); | |
727 { | |
728 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
729 VM_GenCollectFull op(gc_count_before, full_gc_count_before, | |
730 cause, max_level); | |
731 VMThread::execute(&op); | |
732 } | |
733 } | |
734 | |
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735 #if INCLUDE_ALL_GCS |
0 | 736 bool GenCollectedHeap::create_cms_collector() { |
737 | |
738 assert(((_gens[1]->kind() == Generation::ConcurrentMarkSweep) || | |
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739 (_gens[1]->kind() == Generation::ASConcurrentMarkSweep)), |
0 | 740 "Unexpected generation kinds"); |
741 // Skip two header words in the block content verification | |
742 NOT_PRODUCT(_skip_header_HeapWords = CMSCollector::skip_header_HeapWords();) | |
743 CMSCollector* collector = new CMSCollector( | |
744 (ConcurrentMarkSweepGeneration*)_gens[1], | |
745 _rem_set->as_CardTableRS(), | |
746 (ConcurrentMarkSweepPolicy*) collector_policy()); | |
747 | |
748 if (collector == NULL || !collector->completed_initialization()) { | |
749 if (collector) { | |
750 delete collector; // Be nice in embedded situation | |
751 } | |
752 vm_shutdown_during_initialization("Could not create CMS collector"); | |
753 return false; | |
754 } | |
755 return true; // success | |
756 } | |
757 | |
758 void GenCollectedHeap::collect_mostly_concurrent(GCCause::Cause cause) { | |
759 assert(!Heap_lock->owned_by_self(), "Should not own Heap_lock"); | |
760 | |
761 MutexLocker ml(Heap_lock); | |
762 // Read the GC counts while holding the Heap_lock | |
763 unsigned int full_gc_count_before = total_full_collections(); | |
764 unsigned int gc_count_before = total_collections(); | |
765 { | |
766 MutexUnlocker mu(Heap_lock); | |
767 VM_GenCollectFullConcurrent op(gc_count_before, full_gc_count_before, cause); | |
768 VMThread::execute(&op); | |
769 } | |
770 } | |
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771 #endif // INCLUDE_ALL_GCS |
0 | 772 |
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773 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs) { |
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774 do_full_collection(clear_all_soft_refs, _n_gens - 1); |
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775 } |
0 | 776 |
777 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs, | |
778 int max_level) { | |
779 int local_max_level; | |
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780 if (!incremental_collection_will_fail(false /* don't consult_young */) && |
0 | 781 gc_cause() == GCCause::_gc_locker) { |
782 local_max_level = 0; | |
783 } else { | |
784 local_max_level = max_level; | |
785 } | |
786 | |
787 do_collection(true /* full */, | |
788 clear_all_soft_refs /* clear_all_soft_refs */, | |
789 0 /* size */, | |
790 false /* is_tlab */, | |
791 local_max_level /* max_level */); | |
792 // Hack XXX FIX ME !!! | |
793 // A scavenge may not have been attempted, or may have | |
794 // been attempted and failed, because the old gen was too full | |
795 if (local_max_level == 0 && gc_cause() == GCCause::_gc_locker && | |
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796 incremental_collection_will_fail(false /* don't consult_young */)) { |
0 | 797 if (PrintGCDetails) { |
798 gclog_or_tty->print_cr("GC locker: Trying a full collection " | |
799 "because scavenge failed"); | |
800 } | |
801 // This time allow the old gen to be collected as well | |
802 do_collection(true /* full */, | |
803 clear_all_soft_refs /* clear_all_soft_refs */, | |
804 0 /* size */, | |
805 false /* is_tlab */, | |
806 n_gens() - 1 /* max_level */); | |
807 } | |
808 } | |
809 | |
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810 bool GenCollectedHeap::is_in_young(oop p) { |
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811 bool result = ((HeapWord*)p) < _gens[_n_gens - 1]->reserved().start(); |
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812 assert(result == _gens[0]->is_in_reserved(p), |
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813 err_msg("incorrect test - result=%d, p=" PTR_FORMAT, result, (void*)p)); |
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814 return result; |
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815 } |
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816 |
4708 | 817 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
0 | 818 bool GenCollectedHeap::is_in(const void* p) const { |
819 #ifndef ASSERT | |
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820 guarantee(VerifyBeforeGC || |
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821 VerifyDuringGC || |
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822 VerifyBeforeExit || |
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823 VerifyDuringStartup || |
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824 PrintAssembly || |
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825 tty->count() != 0 || // already printing |
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826 VerifyAfterGC || |
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827 VMError::fatal_error_in_progress(), "too expensive"); |
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828 |
0 | 829 #endif |
830 // This might be sped up with a cache of the last generation that | |
831 // answered yes. | |
832 for (int i = 0; i < _n_gens; i++) { | |
833 if (_gens[i]->is_in(p)) return true; | |
834 } | |
835 // Otherwise... | |
836 return false; | |
837 } | |
838 | |
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839 #ifdef ASSERT |
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840 // Don't implement this by using is_in_young(). This method is used |
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841 // in some cases to check that is_in_young() is correct. |
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842 bool GenCollectedHeap::is_in_partial_collection(const void* p) { |
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843 assert(is_in_reserved(p) || p == NULL, |
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844 "Does not work if address is non-null and outside of the heap"); |
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845 return p < _gens[_n_gens - 2]->reserved().end() && p != NULL; |
0 | 846 } |
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847 #endif |
0 | 848 |
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849 void GenCollectedHeap::oop_iterate(ExtendedOopClosure* cl) { |
0 | 850 for (int i = 0; i < _n_gens; i++) { |
851 _gens[i]->oop_iterate(cl); | |
852 } | |
853 } | |
854 | |
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855 void GenCollectedHeap::oop_iterate(MemRegion mr, ExtendedOopClosure* cl) { |
0 | 856 for (int i = 0; i < _n_gens; i++) { |
857 _gens[i]->oop_iterate(mr, cl); | |
858 } | |
859 } | |
860 | |
861 void GenCollectedHeap::object_iterate(ObjectClosure* cl) { | |
862 for (int i = 0; i < _n_gens; i++) { | |
863 _gens[i]->object_iterate(cl); | |
864 } | |
865 } | |
866 | |
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867 void GenCollectedHeap::safe_object_iterate(ObjectClosure* cl) { |
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868 for (int i = 0; i < _n_gens; i++) { |
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869 _gens[i]->safe_object_iterate(cl); |
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870 } |
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871 } |
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872 |
0 | 873 void GenCollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { |
874 for (int i = 0; i < _n_gens; i++) { | |
875 _gens[i]->object_iterate_since_last_GC(cl); | |
876 } | |
877 } | |
878 | |
879 Space* GenCollectedHeap::space_containing(const void* addr) const { | |
880 for (int i = 0; i < _n_gens; i++) { | |
881 Space* res = _gens[i]->space_containing(addr); | |
882 if (res != NULL) return res; | |
883 } | |
884 // Otherwise... | |
885 assert(false, "Could not find containing space"); | |
886 return NULL; | |
887 } | |
888 | |
889 | |
890 HeapWord* GenCollectedHeap::block_start(const void* addr) const { | |
891 assert(is_in_reserved(addr), "block_start of address outside of heap"); | |
892 for (int i = 0; i < _n_gens; i++) { | |
893 if (_gens[i]->is_in_reserved(addr)) { | |
894 assert(_gens[i]->is_in(addr), | |
895 "addr should be in allocated part of generation"); | |
896 return _gens[i]->block_start(addr); | |
897 } | |
898 } | |
899 assert(false, "Some generation should contain the address"); | |
900 return NULL; | |
901 } | |
902 | |
903 size_t GenCollectedHeap::block_size(const HeapWord* addr) const { | |
904 assert(is_in_reserved(addr), "block_size of address outside of heap"); | |
905 for (int i = 0; i < _n_gens; i++) { | |
906 if (_gens[i]->is_in_reserved(addr)) { | |
907 assert(_gens[i]->is_in(addr), | |
908 "addr should be in allocated part of generation"); | |
909 return _gens[i]->block_size(addr); | |
910 } | |
911 } | |
912 assert(false, "Some generation should contain the address"); | |
913 return 0; | |
914 } | |
915 | |
916 bool GenCollectedHeap::block_is_obj(const HeapWord* addr) const { | |
917 assert(is_in_reserved(addr), "block_is_obj of address outside of heap"); | |
918 assert(block_start(addr) == addr, "addr must be a block start"); | |
919 for (int i = 0; i < _n_gens; i++) { | |
920 if (_gens[i]->is_in_reserved(addr)) { | |
921 return _gens[i]->block_is_obj(addr); | |
922 } | |
923 } | |
924 assert(false, "Some generation should contain the address"); | |
925 return false; | |
926 } | |
927 | |
928 bool GenCollectedHeap::supports_tlab_allocation() const { | |
929 for (int i = 0; i < _n_gens; i += 1) { | |
930 if (_gens[i]->supports_tlab_allocation()) { | |
931 return true; | |
932 } | |
933 } | |
934 return false; | |
935 } | |
936 | |
937 size_t GenCollectedHeap::tlab_capacity(Thread* thr) const { | |
938 size_t result = 0; | |
939 for (int i = 0; i < _n_gens; i += 1) { | |
940 if (_gens[i]->supports_tlab_allocation()) { | |
941 result += _gens[i]->tlab_capacity(); | |
942 } | |
943 } | |
944 return result; | |
945 } | |
946 | |
947 size_t GenCollectedHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
948 size_t result = 0; | |
949 for (int i = 0; i < _n_gens; i += 1) { | |
950 if (_gens[i]->supports_tlab_allocation()) { | |
951 result += _gens[i]->unsafe_max_tlab_alloc(); | |
952 } | |
953 } | |
954 return result; | |
955 } | |
956 | |
957 HeapWord* GenCollectedHeap::allocate_new_tlab(size_t size) { | |
958 bool gc_overhead_limit_was_exceeded; | |
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959 return collector_policy()->mem_allocate_work(size /* size */, |
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960 true /* is_tlab */, |
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961 &gc_overhead_limit_was_exceeded); |
0 | 962 } |
963 | |
964 // Requires "*prev_ptr" to be non-NULL. Deletes and a block of minimal size | |
965 // from the list headed by "*prev_ptr". | |
966 static ScratchBlock *removeSmallestScratch(ScratchBlock **prev_ptr) { | |
967 bool first = true; | |
968 size_t min_size = 0; // "first" makes this conceptually infinite. | |
969 ScratchBlock **smallest_ptr, *smallest; | |
970 ScratchBlock *cur = *prev_ptr; | |
971 while (cur) { | |
972 assert(*prev_ptr == cur, "just checking"); | |
973 if (first || cur->num_words < min_size) { | |
974 smallest_ptr = prev_ptr; | |
975 smallest = cur; | |
976 min_size = smallest->num_words; | |
977 first = false; | |
978 } | |
979 prev_ptr = &cur->next; | |
980 cur = cur->next; | |
981 } | |
982 smallest = *smallest_ptr; | |
983 *smallest_ptr = smallest->next; | |
984 return smallest; | |
985 } | |
986 | |
987 // Sort the scratch block list headed by res into decreasing size order, | |
988 // and set "res" to the result. | |
989 static void sort_scratch_list(ScratchBlock*& list) { | |
990 ScratchBlock* sorted = NULL; | |
991 ScratchBlock* unsorted = list; | |
992 while (unsorted) { | |
993 ScratchBlock *smallest = removeSmallestScratch(&unsorted); | |
994 smallest->next = sorted; | |
995 sorted = smallest; | |
996 } | |
997 list = sorted; | |
998 } | |
999 | |
1000 ScratchBlock* GenCollectedHeap::gather_scratch(Generation* requestor, | |
1001 size_t max_alloc_words) { | |
1002 ScratchBlock* res = NULL; | |
1003 for (int i = 0; i < _n_gens; i++) { | |
1004 _gens[i]->contribute_scratch(res, requestor, max_alloc_words); | |
1005 } | |
1006 sort_scratch_list(res); | |
1007 return res; | |
1008 } | |
1009 | |
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1010 void GenCollectedHeap::release_scratch() { |
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1011 for (int i = 0; i < _n_gens; i++) { |
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1012 _gens[i]->reset_scratch(); |
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1013 } |
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1014 } |
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1015 |
0 | 1016 class GenPrepareForVerifyClosure: public GenCollectedHeap::GenClosure { |
1017 void do_generation(Generation* gen) { | |
1018 gen->prepare_for_verify(); | |
1019 } | |
1020 }; | |
1021 | |
1022 void GenCollectedHeap::prepare_for_verify() { | |
1023 ensure_parsability(false); // no need to retire TLABs | |
1024 GenPrepareForVerifyClosure blk; | |
1025 generation_iterate(&blk, false); | |
1026 } | |
1027 | |
1028 | |
1029 void GenCollectedHeap::generation_iterate(GenClosure* cl, | |
1030 bool old_to_young) { | |
1031 if (old_to_young) { | |
1032 for (int i = _n_gens-1; i >= 0; i--) { | |
1033 cl->do_generation(_gens[i]); | |
1034 } | |
1035 } else { | |
1036 for (int i = 0; i < _n_gens; i++) { | |
1037 cl->do_generation(_gens[i]); | |
1038 } | |
1039 } | |
1040 } | |
1041 | |
1042 void GenCollectedHeap::space_iterate(SpaceClosure* cl) { | |
1043 for (int i = 0; i < _n_gens; i++) { | |
1044 _gens[i]->space_iterate(cl, true); | |
1045 } | |
1046 } | |
1047 | |
1048 bool GenCollectedHeap::is_maximal_no_gc() const { | |
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1049 for (int i = 0; i < _n_gens; i++) { |
0 | 1050 if (!_gens[i]->is_maximal_no_gc()) { |
1051 return false; | |
1052 } | |
1053 } | |
1054 return true; | |
1055 } | |
1056 | |
1057 void GenCollectedHeap::save_marks() { | |
1058 for (int i = 0; i < _n_gens; i++) { | |
1059 _gens[i]->save_marks(); | |
1060 } | |
1061 } | |
1062 | |
1063 void GenCollectedHeap::compute_new_generation_sizes(int collectedGen) { | |
1064 for (int i = 0; i <= collectedGen; i++) { | |
1065 _gens[i]->compute_new_size(); | |
1066 } | |
1067 } | |
1068 | |
1069 GenCollectedHeap* GenCollectedHeap::heap() { | |
1070 assert(_gch != NULL, "Uninitialized access to GenCollectedHeap::heap()"); | |
1071 assert(_gch->kind() == CollectedHeap::GenCollectedHeap, "not a generational heap"); | |
1072 return _gch; | |
1073 } | |
1074 | |
1075 | |
1076 void GenCollectedHeap::prepare_for_compaction() { | |
1077 Generation* scanning_gen = _gens[_n_gens-1]; | |
1078 // Start by compacting into same gen. | |
1079 CompactPoint cp(scanning_gen, NULL, NULL); | |
1080 while (scanning_gen != NULL) { | |
1081 scanning_gen->prepare_for_compaction(&cp); | |
1082 scanning_gen = prev_gen(scanning_gen); | |
1083 } | |
1084 } | |
1085 | |
1086 GCStats* GenCollectedHeap::gc_stats(int level) const { | |
1087 return _gens[level]->gc_stats(); | |
1088 } | |
1089 | |
6008 | 1090 void GenCollectedHeap::verify(bool silent, VerifyOption option /* ignored */) { |
0 | 1091 for (int i = _n_gens-1; i >= 0; i--) { |
1092 Generation* g = _gens[i]; | |
1093 if (!silent) { | |
1094 gclog_or_tty->print(g->name()); | |
1095 gclog_or_tty->print(" "); | |
1096 } | |
6008 | 1097 g->verify(); |
0 | 1098 } |
1099 if (!silent) { | |
1100 gclog_or_tty->print("remset "); | |
1101 } | |
1102 rem_set()->verify(); | |
1103 } | |
1104 | |
1105 void GenCollectedHeap::print_on(outputStream* st) const { | |
1106 for (int i = 0; i < _n_gens; i++) { | |
1107 _gens[i]->print_on(st); | |
1108 } | |
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1109 MetaspaceAux::print_on(st); |
0 | 1110 } |
1111 | |
1112 void GenCollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
1113 if (workers() != NULL) { | |
1114 workers()->threads_do(tc); | |
1115 } | |
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1116 #if INCLUDE_ALL_GCS |
0 | 1117 if (UseConcMarkSweepGC) { |
1118 ConcurrentMarkSweepThread::threads_do(tc); | |
1119 } | |
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1120 #endif // INCLUDE_ALL_GCS |
0 | 1121 } |
1122 | |
1123 void GenCollectedHeap::print_gc_threads_on(outputStream* st) const { | |
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1124 #if INCLUDE_ALL_GCS |
0 | 1125 if (UseParNewGC) { |
1126 workers()->print_worker_threads_on(st); | |
1127 } | |
1128 if (UseConcMarkSweepGC) { | |
1129 ConcurrentMarkSweepThread::print_all_on(st); | |
1130 } | |
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1131 #endif // INCLUDE_ALL_GCS |
0 | 1132 } |
1133 | |
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1134 void GenCollectedHeap::print_on_error(outputStream* st) const { |
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1135 this->CollectedHeap::print_on_error(st); |
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1136 |
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1137 #if INCLUDE_ALL_GCS |
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1138 if (UseConcMarkSweepGC) { |
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1139 st->cr(); |
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1140 CMSCollector::print_on_error(st); |
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1141 } |
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1142 #endif // INCLUDE_ALL_GCS |
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1143 } |
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1144 |
0 | 1145 void GenCollectedHeap::print_tracing_info() const { |
1146 if (TraceGen0Time) { | |
1147 get_gen(0)->print_summary_info(); | |
1148 } | |
1149 if (TraceGen1Time) { | |
1150 get_gen(1)->print_summary_info(); | |
1151 } | |
1152 } | |
1153 | |
1154 void GenCollectedHeap::print_heap_change(size_t prev_used) const { | |
1155 if (PrintGCDetails && Verbose) { | |
1156 gclog_or_tty->print(" " SIZE_FORMAT | |
1157 "->" SIZE_FORMAT | |
1158 "(" SIZE_FORMAT ")", | |
1159 prev_used, used(), capacity()); | |
1160 } else { | |
1161 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
1162 "->" SIZE_FORMAT "K" | |
1163 "(" SIZE_FORMAT "K)", | |
1164 prev_used / K, used() / K, capacity() / K); | |
1165 } | |
1166 } | |
1167 | |
1168 class GenGCPrologueClosure: public GenCollectedHeap::GenClosure { | |
1169 private: | |
1170 bool _full; | |
1171 public: | |
1172 void do_generation(Generation* gen) { | |
1173 gen->gc_prologue(_full); | |
1174 } | |
1175 GenGCPrologueClosure(bool full) : _full(full) {}; | |
1176 }; | |
1177 | |
1178 void GenCollectedHeap::gc_prologue(bool full) { | |
1179 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
1180 | |
1181 always_do_update_barrier = false; | |
1182 // Fill TLAB's and such | |
1183 CollectedHeap::accumulate_statistics_all_tlabs(); | |
1184 ensure_parsability(true); // retire TLABs | |
1185 | |
1186 // Call allocation profiler | |
1187 AllocationProfiler::iterate_since_last_gc(); | |
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 |
0 | 1221 always_do_update_barrier = UseConcMarkSweepGC; |
1222 }; | |
1223 | |
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1224 #ifndef PRODUCT |
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1225 class GenGCSaveTopsBeforeGCClosure: public GenCollectedHeap::GenClosure { |
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1226 private: |
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1227 public: |
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1228 void do_generation(Generation* gen) { |
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1229 gen->record_spaces_top(); |
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1230 } |
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1231 }; |
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1232 |
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1233 void GenCollectedHeap::record_gen_tops_before_GC() { |
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1234 if (ZapUnusedHeapArea) { |
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1235 GenGCSaveTopsBeforeGCClosure blk; |
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1236 generation_iterate(&blk, false); // not old-to-young. |
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1237 } |
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1238 } |
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1239 #endif // not PRODUCT |
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1240 |
0 | 1241 class GenEnsureParsabilityClosure: public GenCollectedHeap::GenClosure { |
1242 public: | |
1243 void do_generation(Generation* gen) { | |
1244 gen->ensure_parsability(); | |
1245 } | |
1246 }; | |
1247 | |
1248 void GenCollectedHeap::ensure_parsability(bool retire_tlabs) { | |
1249 CollectedHeap::ensure_parsability(retire_tlabs); | |
1250 GenEnsureParsabilityClosure ep_cl; | |
1251 generation_iterate(&ep_cl, false); | |
1252 } | |
1253 | |
1254 oop GenCollectedHeap::handle_failed_promotion(Generation* gen, | |
1255 oop obj, | |
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1256 size_t obj_size) { |
0 | 1257 assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
1258 HeapWord* result = NULL; | |
1259 | |
1260 // First give each higher generation a chance to allocate the promoted object. | |
1261 Generation* allocator = next_gen(gen); | |
1262 if (allocator != NULL) { | |
1263 do { | |
1264 result = allocator->allocate(obj_size, false); | |
1265 } while (result == NULL && (allocator = next_gen(allocator)) != NULL); | |
1266 } | |
1267 | |
1268 if (result == NULL) { | |
1269 // Then give gen and higher generations a chance to expand and allocate the | |
1270 // object. | |
1271 do { | |
1272 result = gen->expand_and_allocate(obj_size, false); | |
1273 } while (result == NULL && (gen = next_gen(gen)) != NULL); | |
1274 } | |
1275 | |
1276 if (result != NULL) { | |
1277 Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); | |
1278 } | |
1279 return oop(result); | |
1280 } | |
1281 | |
1282 class GenTimeOfLastGCClosure: public GenCollectedHeap::GenClosure { | |
1283 jlong _time; // in ms | |
1284 jlong _now; // in ms | |
1285 | |
1286 public: | |
1287 GenTimeOfLastGCClosure(jlong now) : _time(now), _now(now) { } | |
1288 | |
1289 jlong time() { return _time; } | |
1290 | |
1291 void do_generation(Generation* gen) { | |
1292 _time = MIN2(_time, gen->time_of_last_gc(_now)); | |
1293 } | |
1294 }; | |
1295 | |
1296 jlong GenCollectedHeap::millis_since_last_gc() { | |
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1297 // We need a monotonically non-deccreasing time in ms but |
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1298 // os::javaTimeMillis() does not guarantee monotonicity. |
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1299 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 1300 GenTimeOfLastGCClosure tolgc_cl(now); |
1301 // iterate over generations getting the oldest | |
1302 // time that a generation was collected | |
1303 generation_iterate(&tolgc_cl, false); | |
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1304 |
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1305 // javaTimeNanos() is guaranteed to be monotonically non-decreasing |
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1306 // provided the underlying platform provides such a time source |
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1307 // (and it is bug free). So we still have to guard against getting |
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1308 // back a time later than 'now'. |
0 | 1309 jlong retVal = now - tolgc_cl.time(); |
1310 if (retVal < 0) { | |
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1311 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, retVal);) |
0 | 1312 return 0; |
1313 } | |
1314 return retVal; | |
1315 } |