Mercurial > hg > truffle
annotate src/share/vm/memory/genCollectedHeap.cpp @ 4849:520830f632e7
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Reviewed-by: dholmes, dcubed
author | fparain |
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date | Wed, 25 Jan 2012 10:32:29 -0800 |
parents | 441e946dc1af |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "code/icBuffer.hpp" | |
30 #include "gc_implementation/shared/collectorCounters.hpp" | |
31 #include "gc_implementation/shared/vmGCOperations.hpp" | |
32 #include "gc_interface/collectedHeap.inline.hpp" | |
33 #include "memory/compactPermGen.hpp" | |
34 #include "memory/filemap.hpp" | |
35 #include "memory/gcLocker.inline.hpp" | |
36 #include "memory/genCollectedHeap.hpp" | |
37 #include "memory/genOopClosures.inline.hpp" | |
38 #include "memory/generation.inline.hpp" | |
39 #include "memory/generationSpec.hpp" | |
40 #include "memory/permGen.hpp" | |
41 #include "memory/resourceArea.hpp" | |
42 #include "memory/sharedHeap.hpp" | |
43 #include "memory/space.hpp" | |
44 #include "oops/oop.inline.hpp" | |
45 #include "oops/oop.inline2.hpp" | |
46 #include "runtime/aprofiler.hpp" | |
47 #include "runtime/biasedLocking.hpp" | |
48 #include "runtime/fprofiler.hpp" | |
49 #include "runtime/handles.hpp" | |
50 #include "runtime/handles.inline.hpp" | |
51 #include "runtime/java.hpp" | |
52 #include "runtime/vmThread.hpp" | |
53 #include "services/memoryService.hpp" | |
54 #include "utilities/vmError.hpp" | |
55 #include "utilities/workgroup.hpp" | |
56 #ifndef SERIALGC | |
57 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
58 #include "gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp" | |
59 #endif | |
0 | 60 |
61 GenCollectedHeap* GenCollectedHeap::_gch; | |
62 NOT_PRODUCT(size_t GenCollectedHeap::_skip_header_HeapWords = 0;) | |
63 | |
64 // The set of potentially parallel tasks in strong root scanning. | |
65 enum GCH_process_strong_roots_tasks { | |
66 // We probably want to parallelize both of these internally, but for now... | |
67 GCH_PS_younger_gens, | |
68 // Leave this one last. | |
69 GCH_PS_NumElements | |
70 }; | |
71 | |
72 GenCollectedHeap::GenCollectedHeap(GenCollectorPolicy *policy) : | |
73 SharedHeap(policy), | |
74 _gen_policy(policy), | |
75 _gen_process_strong_tasks(new SubTasksDone(GCH_PS_NumElements)), | |
76 _full_collections_completed(0) | |
77 { | |
78 if (_gen_process_strong_tasks == NULL || | |
79 !_gen_process_strong_tasks->valid()) { | |
80 vm_exit_during_initialization("Failed necessary allocation."); | |
81 } | |
82 assert(policy != NULL, "Sanity check"); | |
83 _preloading_shared_classes = false; | |
84 } | |
85 | |
86 jint GenCollectedHeap::initialize() { | |
1166 | 87 CollectedHeap::pre_initialize(); |
88 | |
0 | 89 int i; |
90 _n_gens = gen_policy()->number_of_generations(); | |
91 | |
92 // While there are no constraints in the GC code that HeapWordSize | |
93 // be any particular value, there are multiple other areas in the | |
94 // system which believe this to be true (e.g. oop->object_size in some | |
95 // cases incorrectly returns the size in wordSize units rather than | |
96 // HeapWordSize). | |
97 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
98 | |
99 // The heap must be at least as aligned as generations. | |
100 size_t alignment = Generation::GenGrain; | |
101 | |
102 _gen_specs = gen_policy()->generations(); | |
103 PermanentGenerationSpec *perm_gen_spec = | |
104 collector_policy()->permanent_generation(); | |
105 | |
106 // Make sure the sizes are all aligned. | |
107 for (i = 0; i < _n_gens; i++) { | |
108 _gen_specs[i]->align(alignment); | |
109 } | |
110 perm_gen_spec->align(alignment); | |
111 | |
112 // If we are dumping the heap, then allocate a wasted block of address | |
113 // space in order to push the heap to a lower address. This extra | |
114 // address range allows for other (or larger) libraries to be loaded | |
115 // without them occupying the space required for the shared spaces. | |
116 | |
117 if (DumpSharedSpaces) { | |
118 uintx reserved = 0; | |
119 uintx block_size = 64*1024*1024; | |
120 while (reserved < SharedDummyBlockSize) { | |
121 char* dummy = os::reserve_memory(block_size); | |
122 reserved += block_size; | |
123 } | |
124 } | |
125 | |
126 // Allocate space for the heap. | |
127 | |
128 char* heap_address; | |
129 size_t total_reserved = 0; | |
130 int n_covered_regions = 0; | |
131 ReservedSpace heap_rs(0); | |
132 | |
133 heap_address = allocate(alignment, perm_gen_spec, &total_reserved, | |
134 &n_covered_regions, &heap_rs); | |
135 | |
136 if (UseSharedSpaces) { | |
137 if (!heap_rs.is_reserved() || heap_address != heap_rs.base()) { | |
138 if (heap_rs.is_reserved()) { | |
139 heap_rs.release(); | |
140 } | |
141 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
142 mapinfo->fail_continue("Unable to reserve shared region."); | |
143 allocate(alignment, perm_gen_spec, &total_reserved, &n_covered_regions, | |
144 &heap_rs); | |
145 } | |
146 } | |
147 | |
148 if (!heap_rs.is_reserved()) { | |
149 vm_shutdown_during_initialization( | |
150 "Could not reserve enough space for object heap"); | |
151 return JNI_ENOMEM; | |
152 } | |
153 | |
154 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
155 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
156 | |
157 // It is important to do this in a way such that concurrent readers can't | |
158 // temporarily think somethings in the heap. (Seen this happen in asserts.) | |
159 _reserved.set_word_size(0); | |
160 _reserved.set_start((HeapWord*)heap_rs.base()); | |
161 size_t actual_heap_size = heap_rs.size() - perm_gen_spec->misc_data_size() | |
162 - perm_gen_spec->misc_code_size(); | |
163 _reserved.set_end((HeapWord*)(heap_rs.base() + actual_heap_size)); | |
164 | |
165 _rem_set = collector_policy()->create_rem_set(_reserved, n_covered_regions); | |
166 set_barrier_set(rem_set()->bs()); | |
1166 | 167 |
0 | 168 _gch = this; |
169 | |
170 for (i = 0; i < _n_gens; i++) { | |
171 ReservedSpace this_rs = heap_rs.first_part(_gen_specs[i]->max_size(), | |
172 UseSharedSpaces, UseSharedSpaces); | |
173 _gens[i] = _gen_specs[i]->init(this_rs, i, rem_set()); | |
174 heap_rs = heap_rs.last_part(_gen_specs[i]->max_size()); | |
175 } | |
176 _perm_gen = perm_gen_spec->init(heap_rs, PermSize, rem_set()); | |
177 | |
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178 clear_incremental_collection_failed(); |
0 | 179 |
180 #ifndef SERIALGC | |
181 // If we are running CMS, create the collector responsible | |
182 // for collecting the CMS generations. | |
183 if (collector_policy()->is_concurrent_mark_sweep_policy()) { | |
184 bool success = create_cms_collector(); | |
185 if (!success) return JNI_ENOMEM; | |
186 } | |
187 #endif // SERIALGC | |
188 | |
189 return JNI_OK; | |
190 } | |
191 | |
192 | |
193 char* GenCollectedHeap::allocate(size_t alignment, | |
194 PermanentGenerationSpec* perm_gen_spec, | |
195 size_t* _total_reserved, | |
196 int* _n_covered_regions, | |
197 ReservedSpace* heap_rs){ | |
198 const char overflow_msg[] = "The size of the object heap + VM data exceeds " | |
199 "the maximum representable size"; | |
200 | |
201 // Now figure out the total size. | |
202 size_t total_reserved = 0; | |
203 int n_covered_regions = 0; | |
204 const size_t pageSize = UseLargePages ? | |
205 os::large_page_size() : os::vm_page_size(); | |
206 | |
207 for (int i = 0; i < _n_gens; i++) { | |
208 total_reserved += _gen_specs[i]->max_size(); | |
209 if (total_reserved < _gen_specs[i]->max_size()) { | |
210 vm_exit_during_initialization(overflow_msg); | |
211 } | |
212 n_covered_regions += _gen_specs[i]->n_covered_regions(); | |
213 } | |
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214 assert(total_reserved % pageSize == 0, |
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215 err_msg("Gen size; total_reserved=" SIZE_FORMAT ", pageSize=" |
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216 SIZE_FORMAT, total_reserved, pageSize)); |
0 | 217 total_reserved += perm_gen_spec->max_size(); |
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218 assert(total_reserved % pageSize == 0, |
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219 err_msg("Perm size; total_reserved=" SIZE_FORMAT ", pageSize=" |
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220 SIZE_FORMAT ", perm gen max=" SIZE_FORMAT, total_reserved, |
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221 pageSize, perm_gen_spec->max_size())); |
0 | 222 |
223 if (total_reserved < perm_gen_spec->max_size()) { | |
224 vm_exit_during_initialization(overflow_msg); | |
225 } | |
226 n_covered_regions += perm_gen_spec->n_covered_regions(); | |
227 | |
228 // Add the size of the data area which shares the same reserved area | |
229 // as the heap, but which is not actually part of the heap. | |
230 size_t s = perm_gen_spec->misc_data_size() + perm_gen_spec->misc_code_size(); | |
231 | |
232 total_reserved += s; | |
233 if (total_reserved < s) { | |
234 vm_exit_during_initialization(overflow_msg); | |
235 } | |
236 | |
237 if (UseLargePages) { | |
238 assert(total_reserved != 0, "total_reserved cannot be 0"); | |
239 total_reserved = round_to(total_reserved, os::large_page_size()); | |
240 if (total_reserved < os::large_page_size()) { | |
241 vm_exit_during_initialization(overflow_msg); | |
242 } | |
243 } | |
244 | |
245 // Calculate the address at which the heap must reside in order for | |
246 // the shared data to be at the required address. | |
247 | |
248 char* heap_address; | |
249 if (UseSharedSpaces) { | |
250 | |
251 // Calculate the address of the first word beyond the heap. | |
252 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
253 int lr = CompactingPermGenGen::n_regions - 1; | |
254 size_t capacity = align_size_up(mapinfo->space_capacity(lr), alignment); | |
255 heap_address = mapinfo->region_base(lr) + capacity; | |
256 | |
257 // Calculate the address of the first word of the heap. | |
258 heap_address -= total_reserved; | |
259 } else { | |
260 heap_address = NULL; // any address will do. | |
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261 if (UseCompressedOops) { |
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262 heap_address = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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263 *_total_reserved = total_reserved; |
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264 *_n_covered_regions = n_covered_regions; |
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265 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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266 UseLargePages, heap_address); |
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267 |
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268 if (heap_address != NULL && !heap_rs->is_reserved()) { |
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269 // Failed to reserve at specified address - the requested memory |
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270 // region is taken already, for example, by 'java' launcher. |
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271 // Try again to reserver heap higher. |
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272 heap_address = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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273 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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274 UseLargePages, heap_address); |
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275 |
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276 if (heap_address != NULL && !heap_rs->is_reserved()) { |
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277 // Failed to reserve at specified address again - give up. |
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278 heap_address = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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279 assert(heap_address == NULL, ""); |
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280 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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281 UseLargePages, heap_address); |
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282 } |
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283 } |
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284 return heap_address; |
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285 } |
0 | 286 } |
287 | |
288 *_total_reserved = total_reserved; | |
289 *_n_covered_regions = n_covered_regions; | |
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290 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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291 UseLargePages, heap_address); |
0 | 292 |
293 return heap_address; | |
294 } | |
295 | |
296 | |
297 void GenCollectedHeap::post_initialize() { | |
298 SharedHeap::post_initialize(); | |
299 TwoGenerationCollectorPolicy *policy = | |
300 (TwoGenerationCollectorPolicy *)collector_policy(); | |
301 guarantee(policy->is_two_generation_policy(), "Illegal policy type"); | |
302 DefNewGeneration* def_new_gen = (DefNewGeneration*) get_gen(0); | |
303 assert(def_new_gen->kind() == Generation::DefNew || | |
304 def_new_gen->kind() == Generation::ParNew || | |
305 def_new_gen->kind() == Generation::ASParNew, | |
306 "Wrong generation kind"); | |
307 | |
308 Generation* old_gen = get_gen(1); | |
309 assert(old_gen->kind() == Generation::ConcurrentMarkSweep || | |
310 old_gen->kind() == Generation::ASConcurrentMarkSweep || | |
311 old_gen->kind() == Generation::MarkSweepCompact, | |
312 "Wrong generation kind"); | |
313 | |
314 policy->initialize_size_policy(def_new_gen->eden()->capacity(), | |
315 old_gen->capacity(), | |
316 def_new_gen->from()->capacity()); | |
317 policy->initialize_gc_policy_counters(); | |
318 } | |
319 | |
320 void GenCollectedHeap::ref_processing_init() { | |
321 SharedHeap::ref_processing_init(); | |
322 for (int i = 0; i < _n_gens; i++) { | |
323 _gens[i]->ref_processor_init(); | |
324 } | |
325 } | |
326 | |
327 size_t GenCollectedHeap::capacity() const { | |
328 size_t res = 0; | |
329 for (int i = 0; i < _n_gens; i++) { | |
330 res += _gens[i]->capacity(); | |
331 } | |
332 return res; | |
333 } | |
334 | |
335 size_t GenCollectedHeap::used() const { | |
336 size_t res = 0; | |
337 for (int i = 0; i < _n_gens; i++) { | |
338 res += _gens[i]->used(); | |
339 } | |
340 return res; | |
341 } | |
342 | |
343 // Save the "used_region" for generations level and lower, | |
344 // and, if perm is true, for perm gen. | |
345 void GenCollectedHeap::save_used_regions(int level, bool perm) { | |
346 assert(level < _n_gens, "Illegal level parameter"); | |
347 for (int i = level; i >= 0; i--) { | |
348 _gens[i]->save_used_region(); | |
349 } | |
350 if (perm) { | |
351 perm_gen()->save_used_region(); | |
352 } | |
353 } | |
354 | |
355 size_t GenCollectedHeap::max_capacity() const { | |
356 size_t res = 0; | |
357 for (int i = 0; i < _n_gens; i++) { | |
358 res += _gens[i]->max_capacity(); | |
359 } | |
360 return res; | |
361 } | |
362 | |
363 // Update the _full_collections_completed counter | |
364 // at the end of a stop-world full GC. | |
365 unsigned int GenCollectedHeap::update_full_collections_completed() { | |
366 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
367 assert(_full_collections_completed <= _total_full_collections, | |
368 "Can't complete more collections than were started"); | |
369 _full_collections_completed = _total_full_collections; | |
370 ml.notify_all(); | |
371 return _full_collections_completed; | |
372 } | |
373 | |
374 // Update the _full_collections_completed counter, as appropriate, | |
375 // at the end of a concurrent GC cycle. Note the conditional update | |
376 // below to allow this method to be called by a concurrent collector | |
377 // without synchronizing in any manner with the VM thread (which | |
378 // may already have initiated a STW full collection "concurrently"). | |
379 unsigned int GenCollectedHeap::update_full_collections_completed(unsigned int count) { | |
380 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
381 assert((_full_collections_completed <= _total_full_collections) && | |
382 (count <= _total_full_collections), | |
383 "Can't complete more collections than were started"); | |
384 if (count > _full_collections_completed) { | |
385 _full_collections_completed = count; | |
386 ml.notify_all(); | |
387 } | |
388 return _full_collections_completed; | |
389 } | |
390 | |
391 | |
392 #ifndef PRODUCT | |
393 // Override of memory state checking method in CollectedHeap: | |
394 // Some collectors (CMS for example) can't have badHeapWordVal written | |
395 // in the first two words of an object. (For instance , in the case of | |
396 // CMS these words hold state used to synchronize between certain | |
397 // (concurrent) GC steps and direct allocating mutators.) | |
398 // The skip_header_HeapWords() method below, allows us to skip | |
399 // over the requisite number of HeapWord's. Note that (for | |
400 // generational collectors) this means that those many words are | |
401 // skipped in each object, irrespective of the generation in which | |
402 // that object lives. The resultant loss of precision seems to be | |
403 // harmless and the pain of avoiding that imprecision appears somewhat | |
404 // higher than we are prepared to pay for such rudimentary debugging | |
405 // support. | |
406 void GenCollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, | |
407 size_t size) { | |
408 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
409 // We are asked to check a size in HeapWords, | |
410 // but the memory is mangled in juint words. | |
411 juint* start = (juint*) (addr + skip_header_HeapWords()); | |
412 juint* end = (juint*) (addr + size); | |
413 for (juint* slot = start; slot < end; slot += 1) { | |
414 assert(*slot == badHeapWordVal, | |
415 "Found non badHeapWordValue in pre-allocation check"); | |
416 } | |
417 } | |
418 } | |
419 #endif | |
420 | |
421 HeapWord* GenCollectedHeap::attempt_allocation(size_t size, | |
422 bool is_tlab, | |
423 bool first_only) { | |
424 HeapWord* res; | |
425 for (int i = 0; i < _n_gens; i++) { | |
426 if (_gens[i]->should_allocate(size, is_tlab)) { | |
427 res = _gens[i]->allocate(size, is_tlab); | |
428 if (res != NULL) return res; | |
429 else if (first_only) break; | |
430 } | |
431 } | |
432 // Otherwise... | |
433 return NULL; | |
434 } | |
435 | |
436 HeapWord* GenCollectedHeap::mem_allocate(size_t size, | |
437 bool* gc_overhead_limit_was_exceeded) { | |
438 return collector_policy()->mem_allocate_work(size, | |
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439 false /* is_tlab */, |
0 | 440 gc_overhead_limit_was_exceeded); |
441 } | |
442 | |
443 bool GenCollectedHeap::must_clear_all_soft_refs() { | |
444 return _gc_cause == GCCause::_last_ditch_collection; | |
445 } | |
446 | |
447 bool GenCollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { | |
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448 return UseConcMarkSweepGC && |
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449 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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450 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
0 | 451 } |
452 | |
453 void GenCollectedHeap::do_collection(bool full, | |
454 bool clear_all_soft_refs, | |
455 size_t size, | |
456 bool is_tlab, | |
457 int max_level) { | |
458 bool prepared_for_verification = false; | |
459 ResourceMark rm; | |
460 DEBUG_ONLY(Thread* my_thread = Thread::current();) | |
461 | |
462 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
463 assert(my_thread->is_VM_thread() || | |
464 my_thread->is_ConcurrentGC_thread(), | |
465 "incorrect thread type capability"); | |
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466 assert(Heap_lock->is_locked(), |
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467 "the requesting thread should have the Heap_lock"); |
0 | 468 guarantee(!is_gc_active(), "collection is not reentrant"); |
469 assert(max_level < n_gens(), "sanity check"); | |
470 | |
471 if (GC_locker::check_active_before_gc()) { | |
472 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
473 } | |
474 | |
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475 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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476 collector_policy()->should_clear_all_soft_refs(); |
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477 |
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478 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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479 |
0 | 480 const size_t perm_prev_used = perm_gen()->used(); |
481 | |
482 if (PrintHeapAtGC) { | |
483 Universe::print_heap_before_gc(); | |
484 if (Verbose) { | |
485 gclog_or_tty->print_cr("GC Cause: %s", GCCause::to_string(gc_cause())); | |
486 } | |
487 } | |
488 | |
489 { | |
490 FlagSetting fl(_is_gc_active, true); | |
491 | |
492 bool complete = full && (max_level == (n_gens()-1)); | |
493 const char* gc_cause_str = "GC "; | |
494 if (complete) { | |
495 GCCause::Cause cause = gc_cause(); | |
496 if (cause == GCCause::_java_lang_system_gc) { | |
497 gc_cause_str = "Full GC (System) "; | |
498 } else { | |
499 gc_cause_str = "Full GC "; | |
500 } | |
501 } | |
502 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
503 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
504 TraceTime t(gc_cause_str, PrintGCDetails, false, gclog_or_tty); | |
505 | |
506 gc_prologue(complete); | |
507 increment_total_collections(complete); | |
508 | |
509 size_t gch_prev_used = used(); | |
510 | |
511 int starting_level = 0; | |
512 if (full) { | |
513 // Search for the oldest generation which will collect all younger | |
514 // generations, and start collection loop there. | |
515 for (int i = max_level; i >= 0; i--) { | |
516 if (_gens[i]->full_collects_younger_generations()) { | |
517 starting_level = i; | |
518 break; | |
519 } | |
520 } | |
521 } | |
522 | |
523 bool must_restore_marks_for_biased_locking = false; | |
524 | |
525 int max_level_collected = starting_level; | |
526 for (int i = starting_level; i <= max_level; i++) { | |
527 if (_gens[i]->should_collect(full, size, is_tlab)) { | |
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528 if (i == n_gens() - 1) { // a major collection is to happen |
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529 if (!complete) { |
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530 // The full_collections increment was missed above. |
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531 increment_total_full_collections(); |
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532 } |
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533 pre_full_gc_dump(); // do any pre full gc dumps |
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534 } |
0 | 535 // Timer for individual generations. Last argument is false: no CR |
536 TraceTime t1(_gens[i]->short_name(), PrintGCDetails, false, gclog_or_tty); | |
537 TraceCollectorStats tcs(_gens[i]->counters()); | |
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538 TraceMemoryManagerStats tmms(_gens[i]->kind(),gc_cause()); |
0 | 539 |
540 size_t prev_used = _gens[i]->used(); | |
541 _gens[i]->stat_record()->invocations++; | |
542 _gens[i]->stat_record()->accumulated_time.start(); | |
543 | |
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544 // Must be done anew before each collection because |
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545 // a previous collection will do mangling and will |
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546 // change top of some spaces. |
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547 record_gen_tops_before_GC(); |
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548 |
0 | 549 if (PrintGC && Verbose) { |
550 gclog_or_tty->print("level=%d invoke=%d size=" SIZE_FORMAT, | |
551 i, | |
552 _gens[i]->stat_record()->invocations, | |
553 size*HeapWordSize); | |
554 } | |
555 | |
556 if (VerifyBeforeGC && i >= VerifyGCLevel && | |
557 total_collections() >= VerifyGCStartAt) { | |
558 HandleMark hm; // Discard invalid handles created during verification | |
559 if (!prepared_for_verification) { | |
560 prepare_for_verify(); | |
561 prepared_for_verification = true; | |
562 } | |
563 gclog_or_tty->print(" VerifyBeforeGC:"); | |
564 Universe::verify(true); | |
565 } | |
566 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
567 | |
568 if (!must_restore_marks_for_biased_locking && | |
569 _gens[i]->performs_in_place_marking()) { | |
570 // We perform this mark word preservation work lazily | |
571 // because it's only at this point that we know whether we | |
572 // absolutely have to do it; we want to avoid doing it for | |
573 // scavenge-only collections where it's unnecessary | |
574 must_restore_marks_for_biased_locking = true; | |
575 BiasedLocking::preserve_marks(); | |
576 } | |
577 | |
578 // Do collection work | |
579 { | |
580 // Note on ref discovery: For what appear to be historical reasons, | |
581 // GCH enables and disabled (by enqueing) refs discovery. | |
582 // In the future this should be moved into the generation's | |
583 // collect method so that ref discovery and enqueueing concerns | |
584 // are local to a generation. The collect method could return | |
585 // an appropriate indication in the case that notification on | |
586 // the ref lock was needed. This will make the treatment of | |
587 // weak refs more uniform (and indeed remove such concerns | |
588 // from GCH). XXX | |
589 | |
590 HandleMark hm; // Discard invalid handles created during gc | |
591 save_marks(); // save marks for all gens | |
592 // We want to discover references, but not process them yet. | |
593 // This mode is disabled in process_discovered_references if the | |
594 // generation does some collection work, or in | |
595 // enqueue_discovered_references if the generation returns | |
596 // without doing any work. | |
597 ReferenceProcessor* rp = _gens[i]->ref_processor(); | |
598 // If the discovery of ("weak") refs in this generation is | |
599 // atomic wrt other collectors in this configuration, we | |
600 // are guaranteed to have empty discovered ref lists. | |
601 if (rp->discovery_is_atomic()) { | |
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602 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
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603 rp->setup_policy(do_clear_all_soft_refs); |
0 | 604 } else { |
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605 // collect() below will enable discovery as appropriate |
0 | 606 } |
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607 _gens[i]->collect(full, do_clear_all_soft_refs, size, is_tlab); |
0 | 608 if (!rp->enqueuing_is_done()) { |
609 rp->enqueue_discovered_references(); | |
610 } else { | |
611 rp->set_enqueuing_is_done(false); | |
612 } | |
613 rp->verify_no_references_recorded(); | |
614 } | |
615 max_level_collected = i; | |
616 | |
617 // Determine if allocation request was met. | |
618 if (size > 0) { | |
619 if (!is_tlab || _gens[i]->supports_tlab_allocation()) { | |
620 if (size*HeapWordSize <= _gens[i]->unsafe_max_alloc_nogc()) { | |
621 size = 0; | |
622 } | |
623 } | |
624 } | |
625 | |
626 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
627 | |
628 _gens[i]->stat_record()->accumulated_time.stop(); | |
629 | |
630 update_gc_stats(i, full); | |
631 | |
632 if (VerifyAfterGC && i >= VerifyGCLevel && | |
633 total_collections() >= VerifyGCStartAt) { | |
634 HandleMark hm; // Discard invalid handles created during verification | |
635 gclog_or_tty->print(" VerifyAfterGC:"); | |
636 Universe::verify(false); | |
637 } | |
638 | |
639 if (PrintGCDetails) { | |
640 gclog_or_tty->print(":"); | |
641 _gens[i]->print_heap_change(prev_used); | |
642 } | |
643 } | |
644 } | |
645 | |
646 // Update "complete" boolean wrt what actually transpired -- | |
647 // for instance, a promotion failure could have led to | |
648 // a whole heap collection. | |
649 complete = complete || (max_level_collected == n_gens() - 1); | |
650 | |
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651 if (complete) { // We did a "major" collection |
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652 post_full_gc_dump(); // do any post full gc dumps |
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653 } |
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654 |
0 | 655 if (PrintGCDetails) { |
656 print_heap_change(gch_prev_used); | |
657 | |
658 // Print perm gen info for full GC with PrintGCDetails flag. | |
659 if (complete) { | |
660 print_perm_heap_change(perm_prev_used); | |
661 } | |
662 } | |
663 | |
664 for (int j = max_level_collected; j >= 0; j -= 1) { | |
665 // Adjust generation sizes. | |
666 _gens[j]->compute_new_size(); | |
667 } | |
668 | |
669 if (complete) { | |
670 // Ask the permanent generation to adjust size for full collections | |
671 perm()->compute_new_size(); | |
672 update_full_collections_completed(); | |
673 } | |
674 | |
675 // Track memory usage and detect low memory after GC finishes | |
676 MemoryService::track_memory_usage(); | |
677 | |
678 gc_epilogue(complete); | |
679 | |
680 if (must_restore_marks_for_biased_locking) { | |
681 BiasedLocking::restore_marks(); | |
682 } | |
683 } | |
684 | |
685 AdaptiveSizePolicy* sp = gen_policy()->size_policy(); | |
686 AdaptiveSizePolicyOutput(sp, total_collections()); | |
687 | |
688 if (PrintHeapAtGC) { | |
689 Universe::print_heap_after_gc(); | |
690 } | |
691 | |
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692 #ifdef TRACESPINNING |
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693 ParallelTaskTerminator::print_termination_counts(); |
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694 #endif |
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695 |
0 | 696 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
697 tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); | |
698 vm_exit(-1); | |
699 } | |
700 } | |
701 | |
702 HeapWord* GenCollectedHeap::satisfy_failed_allocation(size_t size, bool is_tlab) { | |
703 return collector_policy()->satisfy_failed_allocation(size, is_tlab); | |
704 } | |
705 | |
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706 void GenCollectedHeap::set_par_threads(uint t) { |
0 | 707 SharedHeap::set_par_threads(t); |
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708 _gen_process_strong_tasks->set_n_threads(t); |
0 | 709 } |
710 | |
711 void GenCollectedHeap:: | |
712 gen_process_strong_roots(int level, | |
713 bool younger_gens_as_roots, | |
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714 bool activate_scope, |
0 | 715 bool collecting_perm_gen, |
716 SharedHeap::ScanningOption so, | |
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717 OopsInGenClosure* not_older_gens, |
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718 bool do_code_roots, |
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719 OopsInGenClosure* older_gens) { |
0 | 720 // General strong roots. |
989
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721 |
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722 if (!do_code_roots) { |
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723 SharedHeap::process_strong_roots(activate_scope, collecting_perm_gen, so, |
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724 not_older_gens, NULL, older_gens); |
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725 } else { |
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726 bool do_code_marking = (activate_scope || nmethod::oops_do_marking_is_active()); |
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727 CodeBlobToOopClosure code_roots(not_older_gens, /*do_marking=*/ do_code_marking); |
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728 SharedHeap::process_strong_roots(activate_scope, collecting_perm_gen, so, |
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729 not_older_gens, &code_roots, older_gens); |
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730 } |
0 | 731 |
732 if (younger_gens_as_roots) { | |
733 if (!_gen_process_strong_tasks->is_task_claimed(GCH_PS_younger_gens)) { | |
734 for (int i = 0; i < level; i++) { | |
735 not_older_gens->set_generation(_gens[i]); | |
736 _gens[i]->oop_iterate(not_older_gens); | |
737 } | |
738 not_older_gens->reset_generation(); | |
739 } | |
740 } | |
741 // When collection is parallel, all threads get to cooperate to do | |
742 // older-gen scanning. | |
743 for (int i = level+1; i < _n_gens; i++) { | |
744 older_gens->set_generation(_gens[i]); | |
745 rem_set()->younger_refs_iterate(_gens[i], older_gens); | |
746 older_gens->reset_generation(); | |
747 } | |
748 | |
749 _gen_process_strong_tasks->all_tasks_completed(); | |
750 } | |
751 | |
752 void GenCollectedHeap::gen_process_weak_roots(OopClosure* root_closure, | |
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753 CodeBlobClosure* code_roots, |
0 | 754 OopClosure* non_root_closure) { |
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755 SharedHeap::process_weak_roots(root_closure, code_roots, non_root_closure); |
0 | 756 // "Local" "weak" refs |
757 for (int i = 0; i < _n_gens; i++) { | |
758 _gens[i]->ref_processor()->weak_oops_do(root_closure); | |
759 } | |
760 } | |
761 | |
762 #define GCH_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
763 void GenCollectedHeap:: \ | |
764 oop_since_save_marks_iterate(int level, \ | |
765 OopClosureType* cur, \ | |
766 OopClosureType* older) { \ | |
767 _gens[level]->oop_since_save_marks_iterate##nv_suffix(cur); \ | |
768 for (int i = level+1; i < n_gens(); i++) { \ | |
769 _gens[i]->oop_since_save_marks_iterate##nv_suffix(older); \ | |
770 } \ | |
771 perm_gen()->oop_since_save_marks_iterate##nv_suffix(older); \ | |
772 } | |
773 | |
774 ALL_SINCE_SAVE_MARKS_CLOSURES(GCH_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
775 | |
776 #undef GCH_SINCE_SAVE_MARKS_ITERATE_DEFN | |
777 | |
778 bool GenCollectedHeap::no_allocs_since_save_marks(int level) { | |
779 for (int i = level; i < _n_gens; i++) { | |
780 if (!_gens[i]->no_allocs_since_save_marks()) return false; | |
781 } | |
782 return perm_gen()->no_allocs_since_save_marks(); | |
783 } | |
784 | |
785 bool GenCollectedHeap::supports_inline_contig_alloc() const { | |
786 return _gens[0]->supports_inline_contig_alloc(); | |
787 } | |
788 | |
789 HeapWord** GenCollectedHeap::top_addr() const { | |
790 return _gens[0]->top_addr(); | |
791 } | |
792 | |
793 HeapWord** GenCollectedHeap::end_addr() const { | |
794 return _gens[0]->end_addr(); | |
795 } | |
796 | |
797 size_t GenCollectedHeap::unsafe_max_alloc() { | |
798 return _gens[0]->unsafe_max_alloc_nogc(); | |
799 } | |
800 | |
801 // public collection interfaces | |
802 | |
803 void GenCollectedHeap::collect(GCCause::Cause cause) { | |
804 if (should_do_concurrent_full_gc(cause)) { | |
805 #ifndef SERIALGC | |
806 // mostly concurrent full collection | |
807 collect_mostly_concurrent(cause); | |
808 #else // SERIALGC | |
809 ShouldNotReachHere(); | |
810 #endif // SERIALGC | |
811 } else { | |
812 #ifdef ASSERT | |
813 if (cause == GCCause::_scavenge_alot) { | |
814 // minor collection only | |
815 collect(cause, 0); | |
816 } else { | |
817 // Stop-the-world full collection | |
818 collect(cause, n_gens() - 1); | |
819 } | |
820 #else | |
821 // Stop-the-world full collection | |
822 collect(cause, n_gens() - 1); | |
823 #endif | |
824 } | |
825 } | |
826 | |
827 void GenCollectedHeap::collect(GCCause::Cause cause, int max_level) { | |
828 // The caller doesn't have the Heap_lock | |
829 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
830 MutexLocker ml(Heap_lock); | |
831 collect_locked(cause, max_level); | |
832 } | |
833 | |
834 // This interface assumes that it's being called by the | |
835 // vm thread. It collects the heap assuming that the | |
836 // heap lock is already held and that we are executing in | |
837 // the context of the vm thread. | |
838 void GenCollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
839 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
840 assert(Heap_lock->is_locked(), "Precondition#2"); | |
841 GCCauseSetter gcs(this, cause); | |
842 switch (cause) { | |
843 case GCCause::_heap_inspection: | |
844 case GCCause::_heap_dump: { | |
845 HandleMark hm; | |
846 do_full_collection(false, // don't clear all soft refs | |
847 n_gens() - 1); | |
848 break; | |
849 } | |
850 default: // XXX FIX ME | |
851 ShouldNotReachHere(); // Unexpected use of this function | |
852 } | |
853 } | |
854 | |
855 void GenCollectedHeap::collect_locked(GCCause::Cause cause) { | |
856 // The caller has the Heap_lock | |
857 assert(Heap_lock->owned_by_self(), "this thread should own the Heap_lock"); | |
858 collect_locked(cause, n_gens() - 1); | |
859 } | |
860 | |
861 // this is the private collection interface | |
862 // The Heap_lock is expected to be held on entry. | |
863 | |
864 void GenCollectedHeap::collect_locked(GCCause::Cause cause, int max_level) { | |
865 if (_preloading_shared_classes) { | |
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866 report_out_of_shared_space(SharedPermGen); |
0 | 867 } |
868 // Read the GC count while holding the Heap_lock | |
869 unsigned int gc_count_before = total_collections(); | |
870 unsigned int full_gc_count_before = total_full_collections(); | |
871 { | |
872 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
873 VM_GenCollectFull op(gc_count_before, full_gc_count_before, | |
874 cause, max_level); | |
875 VMThread::execute(&op); | |
876 } | |
877 } | |
878 | |
879 #ifndef SERIALGC | |
880 bool GenCollectedHeap::create_cms_collector() { | |
881 | |
882 assert(((_gens[1]->kind() == Generation::ConcurrentMarkSweep) || | |
883 (_gens[1]->kind() == Generation::ASConcurrentMarkSweep)) && | |
884 _perm_gen->as_gen()->kind() == Generation::ConcurrentMarkSweep, | |
885 "Unexpected generation kinds"); | |
886 // Skip two header words in the block content verification | |
887 NOT_PRODUCT(_skip_header_HeapWords = CMSCollector::skip_header_HeapWords();) | |
888 CMSCollector* collector = new CMSCollector( | |
889 (ConcurrentMarkSweepGeneration*)_gens[1], | |
890 (ConcurrentMarkSweepGeneration*)_perm_gen->as_gen(), | |
891 _rem_set->as_CardTableRS(), | |
892 (ConcurrentMarkSweepPolicy*) collector_policy()); | |
893 | |
894 if (collector == NULL || !collector->completed_initialization()) { | |
895 if (collector) { | |
896 delete collector; // Be nice in embedded situation | |
897 } | |
898 vm_shutdown_during_initialization("Could not create CMS collector"); | |
899 return false; | |
900 } | |
901 return true; // success | |
902 } | |
903 | |
904 void GenCollectedHeap::collect_mostly_concurrent(GCCause::Cause cause) { | |
905 assert(!Heap_lock->owned_by_self(), "Should not own Heap_lock"); | |
906 | |
907 MutexLocker ml(Heap_lock); | |
908 // Read the GC counts while holding the Heap_lock | |
909 unsigned int full_gc_count_before = total_full_collections(); | |
910 unsigned int gc_count_before = total_collections(); | |
911 { | |
912 MutexUnlocker mu(Heap_lock); | |
913 VM_GenCollectFullConcurrent op(gc_count_before, full_gc_count_before, cause); | |
914 VMThread::execute(&op); | |
915 } | |
916 } | |
917 #endif // SERIALGC | |
918 | |
919 | |
920 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs, | |
921 int max_level) { | |
922 int local_max_level; | |
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923 if (!incremental_collection_will_fail(false /* don't consult_young */) && |
0 | 924 gc_cause() == GCCause::_gc_locker) { |
925 local_max_level = 0; | |
926 } else { | |
927 local_max_level = max_level; | |
928 } | |
929 | |
930 do_collection(true /* full */, | |
931 clear_all_soft_refs /* clear_all_soft_refs */, | |
932 0 /* size */, | |
933 false /* is_tlab */, | |
934 local_max_level /* max_level */); | |
935 // Hack XXX FIX ME !!! | |
936 // A scavenge may not have been attempted, or may have | |
937 // been attempted and failed, because the old gen was too full | |
938 if (local_max_level == 0 && gc_cause() == GCCause::_gc_locker && | |
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939 incremental_collection_will_fail(false /* don't consult_young */)) { |
0 | 940 if (PrintGCDetails) { |
941 gclog_or_tty->print_cr("GC locker: Trying a full collection " | |
942 "because scavenge failed"); | |
943 } | |
944 // This time allow the old gen to be collected as well | |
945 do_collection(true /* full */, | |
946 clear_all_soft_refs /* clear_all_soft_refs */, | |
947 0 /* size */, | |
948 false /* is_tlab */, | |
949 n_gens() - 1 /* max_level */); | |
950 } | |
951 } | |
952 | |
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953 bool GenCollectedHeap::is_in_young(oop p) { |
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954 bool result = ((HeapWord*)p) < _gens[_n_gens - 1]->reserved().start(); |
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955 assert(result == _gens[0]->is_in_reserved(p), |
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956 err_msg("incorrect test - result=%d, p=" PTR_FORMAT, result, (void*)p)); |
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957 return result; |
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958 } |
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959 |
4708 | 960 // Returns "TRUE" iff "p" points into the committed areas of the heap. |
0 | 961 bool GenCollectedHeap::is_in(const void* p) const { |
962 #ifndef ASSERT | |
963 guarantee(VerifyBeforeGC || | |
964 VerifyDuringGC || | |
965 VerifyBeforeExit || | |
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966 PrintAssembly || |
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967 tty->count() != 0 || // already printing |
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968 VerifyAfterGC || |
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969 VMError::fatal_error_in_progress(), "too expensive"); |
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970 |
0 | 971 #endif |
972 // This might be sped up with a cache of the last generation that | |
973 // answered yes. | |
974 for (int i = 0; i < _n_gens; i++) { | |
975 if (_gens[i]->is_in(p)) return true; | |
976 } | |
977 if (_perm_gen->as_gen()->is_in(p)) return true; | |
978 // Otherwise... | |
979 return false; | |
980 } | |
981 | |
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982 #ifdef ASSERT |
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983 // Don't implement this by using is_in_young(). This method is used |
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984 // in some cases to check that is_in_young() is correct. |
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985 bool GenCollectedHeap::is_in_partial_collection(const void* p) { |
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986 assert(is_in_reserved(p) || p == NULL, |
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987 "Does not work if address is non-null and outside of the heap"); |
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988 // The order of the generations is young (low addr), old, perm (high addr) |
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989 return p < _gens[_n_gens - 2]->reserved().end() && p != NULL; |
0 | 990 } |
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991 #endif |
0 | 992 |
993 void GenCollectedHeap::oop_iterate(OopClosure* cl) { | |
994 for (int i = 0; i < _n_gens; i++) { | |
995 _gens[i]->oop_iterate(cl); | |
996 } | |
997 } | |
998 | |
999 void GenCollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl) { | |
1000 for (int i = 0; i < _n_gens; i++) { | |
1001 _gens[i]->oop_iterate(mr, cl); | |
1002 } | |
1003 } | |
1004 | |
1005 void GenCollectedHeap::object_iterate(ObjectClosure* cl) { | |
1006 for (int i = 0; i < _n_gens; i++) { | |
1007 _gens[i]->object_iterate(cl); | |
1008 } | |
1009 perm_gen()->object_iterate(cl); | |
1010 } | |
1011 | |
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1012 void GenCollectedHeap::safe_object_iterate(ObjectClosure* cl) { |
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1013 for (int i = 0; i < _n_gens; i++) { |
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1014 _gens[i]->safe_object_iterate(cl); |
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1015 } |
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1016 perm_gen()->safe_object_iterate(cl); |
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1017 } |
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1018 |
0 | 1019 void GenCollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { |
1020 for (int i = 0; i < _n_gens; i++) { | |
1021 _gens[i]->object_iterate_since_last_GC(cl); | |
1022 } | |
1023 } | |
1024 | |
1025 Space* GenCollectedHeap::space_containing(const void* addr) const { | |
1026 for (int i = 0; i < _n_gens; i++) { | |
1027 Space* res = _gens[i]->space_containing(addr); | |
1028 if (res != NULL) return res; | |
1029 } | |
1030 Space* res = perm_gen()->space_containing(addr); | |
1031 if (res != NULL) return res; | |
1032 // Otherwise... | |
1033 assert(false, "Could not find containing space"); | |
1034 return NULL; | |
1035 } | |
1036 | |
1037 | |
1038 HeapWord* GenCollectedHeap::block_start(const void* addr) const { | |
1039 assert(is_in_reserved(addr), "block_start of address outside of heap"); | |
1040 for (int i = 0; i < _n_gens; i++) { | |
1041 if (_gens[i]->is_in_reserved(addr)) { | |
1042 assert(_gens[i]->is_in(addr), | |
1043 "addr should be in allocated part of generation"); | |
1044 return _gens[i]->block_start(addr); | |
1045 } | |
1046 } | |
1047 if (perm_gen()->is_in_reserved(addr)) { | |
1048 assert(perm_gen()->is_in(addr), | |
1049 "addr should be in allocated part of perm gen"); | |
1050 return perm_gen()->block_start(addr); | |
1051 } | |
1052 assert(false, "Some generation should contain the address"); | |
1053 return NULL; | |
1054 } | |
1055 | |
1056 size_t GenCollectedHeap::block_size(const HeapWord* addr) const { | |
1057 assert(is_in_reserved(addr), "block_size of address outside of heap"); | |
1058 for (int i = 0; i < _n_gens; i++) { | |
1059 if (_gens[i]->is_in_reserved(addr)) { | |
1060 assert(_gens[i]->is_in(addr), | |
1061 "addr should be in allocated part of generation"); | |
1062 return _gens[i]->block_size(addr); | |
1063 } | |
1064 } | |
1065 if (perm_gen()->is_in_reserved(addr)) { | |
1066 assert(perm_gen()->is_in(addr), | |
1067 "addr should be in allocated part of perm gen"); | |
1068 return perm_gen()->block_size(addr); | |
1069 } | |
1070 assert(false, "Some generation should contain the address"); | |
1071 return 0; | |
1072 } | |
1073 | |
1074 bool GenCollectedHeap::block_is_obj(const HeapWord* addr) const { | |
1075 assert(is_in_reserved(addr), "block_is_obj of address outside of heap"); | |
1076 assert(block_start(addr) == addr, "addr must be a block start"); | |
1077 for (int i = 0; i < _n_gens; i++) { | |
1078 if (_gens[i]->is_in_reserved(addr)) { | |
1079 return _gens[i]->block_is_obj(addr); | |
1080 } | |
1081 } | |
1082 if (perm_gen()->is_in_reserved(addr)) { | |
1083 return perm_gen()->block_is_obj(addr); | |
1084 } | |
1085 assert(false, "Some generation should contain the address"); | |
1086 return false; | |
1087 } | |
1088 | |
1089 bool GenCollectedHeap::supports_tlab_allocation() const { | |
1090 for (int i = 0; i < _n_gens; i += 1) { | |
1091 if (_gens[i]->supports_tlab_allocation()) { | |
1092 return true; | |
1093 } | |
1094 } | |
1095 return false; | |
1096 } | |
1097 | |
1098 size_t GenCollectedHeap::tlab_capacity(Thread* thr) const { | |
1099 size_t result = 0; | |
1100 for (int i = 0; i < _n_gens; i += 1) { | |
1101 if (_gens[i]->supports_tlab_allocation()) { | |
1102 result += _gens[i]->tlab_capacity(); | |
1103 } | |
1104 } | |
1105 return result; | |
1106 } | |
1107 | |
1108 size_t GenCollectedHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
1109 size_t result = 0; | |
1110 for (int i = 0; i < _n_gens; i += 1) { | |
1111 if (_gens[i]->supports_tlab_allocation()) { | |
1112 result += _gens[i]->unsafe_max_tlab_alloc(); | |
1113 } | |
1114 } | |
1115 return result; | |
1116 } | |
1117 | |
1118 HeapWord* GenCollectedHeap::allocate_new_tlab(size_t size) { | |
1119 bool gc_overhead_limit_was_exceeded; | |
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1120 return collector_policy()->mem_allocate_work(size /* size */, |
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1121 true /* is_tlab */, |
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1122 &gc_overhead_limit_was_exceeded); |
0 | 1123 } |
1124 | |
1125 // Requires "*prev_ptr" to be non-NULL. Deletes and a block of minimal size | |
1126 // from the list headed by "*prev_ptr". | |
1127 static ScratchBlock *removeSmallestScratch(ScratchBlock **prev_ptr) { | |
1128 bool first = true; | |
1129 size_t min_size = 0; // "first" makes this conceptually infinite. | |
1130 ScratchBlock **smallest_ptr, *smallest; | |
1131 ScratchBlock *cur = *prev_ptr; | |
1132 while (cur) { | |
1133 assert(*prev_ptr == cur, "just checking"); | |
1134 if (first || cur->num_words < min_size) { | |
1135 smallest_ptr = prev_ptr; | |
1136 smallest = cur; | |
1137 min_size = smallest->num_words; | |
1138 first = false; | |
1139 } | |
1140 prev_ptr = &cur->next; | |
1141 cur = cur->next; | |
1142 } | |
1143 smallest = *smallest_ptr; | |
1144 *smallest_ptr = smallest->next; | |
1145 return smallest; | |
1146 } | |
1147 | |
1148 // Sort the scratch block list headed by res into decreasing size order, | |
1149 // and set "res" to the result. | |
1150 static void sort_scratch_list(ScratchBlock*& list) { | |
1151 ScratchBlock* sorted = NULL; | |
1152 ScratchBlock* unsorted = list; | |
1153 while (unsorted) { | |
1154 ScratchBlock *smallest = removeSmallestScratch(&unsorted); | |
1155 smallest->next = sorted; | |
1156 sorted = smallest; | |
1157 } | |
1158 list = sorted; | |
1159 } | |
1160 | |
1161 ScratchBlock* GenCollectedHeap::gather_scratch(Generation* requestor, | |
1162 size_t max_alloc_words) { | |
1163 ScratchBlock* res = NULL; | |
1164 for (int i = 0; i < _n_gens; i++) { | |
1165 _gens[i]->contribute_scratch(res, requestor, max_alloc_words); | |
1166 } | |
1167 sort_scratch_list(res); | |
1168 return res; | |
1169 } | |
1170 | |
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1171 void GenCollectedHeap::release_scratch() { |
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1172 for (int i = 0; i < _n_gens; i++) { |
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1173 _gens[i]->reset_scratch(); |
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1174 } |
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1175 } |
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1176 |
0 | 1177 class GenPrepareForVerifyClosure: public GenCollectedHeap::GenClosure { |
1178 void do_generation(Generation* gen) { | |
1179 gen->prepare_for_verify(); | |
1180 } | |
1181 }; | |
1182 | |
1183 void GenCollectedHeap::prepare_for_verify() { | |
1184 ensure_parsability(false); // no need to retire TLABs | |
1185 GenPrepareForVerifyClosure blk; | |
1186 generation_iterate(&blk, false); | |
1187 perm_gen()->prepare_for_verify(); | |
1188 } | |
1189 | |
1190 | |
1191 void GenCollectedHeap::generation_iterate(GenClosure* cl, | |
1192 bool old_to_young) { | |
1193 if (old_to_young) { | |
1194 for (int i = _n_gens-1; i >= 0; i--) { | |
1195 cl->do_generation(_gens[i]); | |
1196 } | |
1197 } else { | |
1198 for (int i = 0; i < _n_gens; i++) { | |
1199 cl->do_generation(_gens[i]); | |
1200 } | |
1201 } | |
1202 } | |
1203 | |
1204 void GenCollectedHeap::space_iterate(SpaceClosure* cl) { | |
1205 for (int i = 0; i < _n_gens; i++) { | |
1206 _gens[i]->space_iterate(cl, true); | |
1207 } | |
1208 perm_gen()->space_iterate(cl, true); | |
1209 } | |
1210 | |
1211 bool GenCollectedHeap::is_maximal_no_gc() const { | |
1212 for (int i = 0; i < _n_gens; i++) { // skip perm gen | |
1213 if (!_gens[i]->is_maximal_no_gc()) { | |
1214 return false; | |
1215 } | |
1216 } | |
1217 return true; | |
1218 } | |
1219 | |
1220 void GenCollectedHeap::save_marks() { | |
1221 for (int i = 0; i < _n_gens; i++) { | |
1222 _gens[i]->save_marks(); | |
1223 } | |
1224 perm_gen()->save_marks(); | |
1225 } | |
1226 | |
1227 void GenCollectedHeap::compute_new_generation_sizes(int collectedGen) { | |
1228 for (int i = 0; i <= collectedGen; i++) { | |
1229 _gens[i]->compute_new_size(); | |
1230 } | |
1231 } | |
1232 | |
1233 GenCollectedHeap* GenCollectedHeap::heap() { | |
1234 assert(_gch != NULL, "Uninitialized access to GenCollectedHeap::heap()"); | |
1235 assert(_gch->kind() == CollectedHeap::GenCollectedHeap, "not a generational heap"); | |
1236 return _gch; | |
1237 } | |
1238 | |
1239 | |
1240 void GenCollectedHeap::prepare_for_compaction() { | |
1241 Generation* scanning_gen = _gens[_n_gens-1]; | |
1242 // Start by compacting into same gen. | |
1243 CompactPoint cp(scanning_gen, NULL, NULL); | |
1244 while (scanning_gen != NULL) { | |
1245 scanning_gen->prepare_for_compaction(&cp); | |
1246 scanning_gen = prev_gen(scanning_gen); | |
1247 } | |
1248 } | |
1249 | |
1250 GCStats* GenCollectedHeap::gc_stats(int level) const { | |
1251 return _gens[level]->gc_stats(); | |
1252 } | |
1253 | |
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1254 void GenCollectedHeap::verify(bool allow_dirty, bool silent, VerifyOption option /* ignored */) { |
0 | 1255 if (!silent) { |
1256 gclog_or_tty->print("permgen "); | |
1257 } | |
1258 perm_gen()->verify(allow_dirty); | |
1259 for (int i = _n_gens-1; i >= 0; i--) { | |
1260 Generation* g = _gens[i]; | |
1261 if (!silent) { | |
1262 gclog_or_tty->print(g->name()); | |
1263 gclog_or_tty->print(" "); | |
1264 } | |
1265 g->verify(allow_dirty); | |
1266 } | |
1267 if (!silent) { | |
1268 gclog_or_tty->print("remset "); | |
1269 } | |
1270 rem_set()->verify(); | |
1271 } | |
1272 | |
1273 void GenCollectedHeap::print_on(outputStream* st) const { | |
1274 for (int i = 0; i < _n_gens; i++) { | |
1275 _gens[i]->print_on(st); | |
1276 } | |
1277 perm_gen()->print_on(st); | |
1278 } | |
1279 | |
1280 void GenCollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
1281 if (workers() != NULL) { | |
1282 workers()->threads_do(tc); | |
1283 } | |
1284 #ifndef SERIALGC | |
1285 if (UseConcMarkSweepGC) { | |
1286 ConcurrentMarkSweepThread::threads_do(tc); | |
1287 } | |
1288 #endif // SERIALGC | |
1289 } | |
1290 | |
1291 void GenCollectedHeap::print_gc_threads_on(outputStream* st) const { | |
1292 #ifndef SERIALGC | |
1293 if (UseParNewGC) { | |
1294 workers()->print_worker_threads_on(st); | |
1295 } | |
1296 if (UseConcMarkSweepGC) { | |
1297 ConcurrentMarkSweepThread::print_all_on(st); | |
1298 } | |
1299 #endif // SERIALGC | |
1300 } | |
1301 | |
1302 void GenCollectedHeap::print_tracing_info() const { | |
1303 if (TraceGen0Time) { | |
1304 get_gen(0)->print_summary_info(); | |
1305 } | |
1306 if (TraceGen1Time) { | |
1307 get_gen(1)->print_summary_info(); | |
1308 } | |
1309 } | |
1310 | |
1311 void GenCollectedHeap::print_heap_change(size_t prev_used) const { | |
1312 if (PrintGCDetails && Verbose) { | |
1313 gclog_or_tty->print(" " SIZE_FORMAT | |
1314 "->" SIZE_FORMAT | |
1315 "(" SIZE_FORMAT ")", | |
1316 prev_used, used(), capacity()); | |
1317 } else { | |
1318 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
1319 "->" SIZE_FORMAT "K" | |
1320 "(" SIZE_FORMAT "K)", | |
1321 prev_used / K, used() / K, capacity() / K); | |
1322 } | |
1323 } | |
1324 | |
1325 //New method to print perm gen info with PrintGCDetails flag | |
1326 void GenCollectedHeap::print_perm_heap_change(size_t perm_prev_used) const { | |
1327 gclog_or_tty->print(", [%s :", perm_gen()->short_name()); | |
1328 perm_gen()->print_heap_change(perm_prev_used); | |
1329 gclog_or_tty->print("]"); | |
1330 } | |
1331 | |
1332 class GenGCPrologueClosure: public GenCollectedHeap::GenClosure { | |
1333 private: | |
1334 bool _full; | |
1335 public: | |
1336 void do_generation(Generation* gen) { | |
1337 gen->gc_prologue(_full); | |
1338 } | |
1339 GenGCPrologueClosure(bool full) : _full(full) {}; | |
1340 }; | |
1341 | |
1342 void GenCollectedHeap::gc_prologue(bool full) { | |
1343 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
1344 | |
1345 always_do_update_barrier = false; | |
1346 // Fill TLAB's and such | |
1347 CollectedHeap::accumulate_statistics_all_tlabs(); | |
1348 ensure_parsability(true); // retire TLABs | |
1349 | |
1350 // Call allocation profiler | |
1351 AllocationProfiler::iterate_since_last_gc(); | |
1352 // Walk generations | |
1353 GenGCPrologueClosure blk(full); | |
1354 generation_iterate(&blk, false); // not old-to-young. | |
1355 perm_gen()->gc_prologue(full); | |
1356 }; | |
1357 | |
1358 class GenGCEpilogueClosure: public GenCollectedHeap::GenClosure { | |
1359 private: | |
1360 bool _full; | |
1361 public: | |
1362 void do_generation(Generation* gen) { | |
1363 gen->gc_epilogue(_full); | |
1364 } | |
1365 GenGCEpilogueClosure(bool full) : _full(full) {}; | |
1366 }; | |
1367 | |
1368 void GenCollectedHeap::gc_epilogue(bool full) { | |
1369 #ifdef COMPILER2 | |
1370 assert(DerivedPointerTable::is_empty(), "derived pointer present"); | |
1371 size_t actual_gap = pointer_delta((HeapWord*) (max_uintx-3), *(end_addr())); | |
1372 guarantee(actual_gap > (size_t)FastAllocateSizeLimit, "inline allocation wraps"); | |
1373 #endif /* COMPILER2 */ | |
1374 | |
1375 resize_all_tlabs(); | |
1376 | |
1377 GenGCEpilogueClosure blk(full); | |
1378 generation_iterate(&blk, false); // not old-to-young. | |
1379 perm_gen()->gc_epilogue(full); | |
1380 | |
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1381 if (!CleanChunkPoolAsync) { |
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1382 Chunk::clean_chunk_pool(); |
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1383 } |
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1384 |
0 | 1385 always_do_update_barrier = UseConcMarkSweepGC; |
1386 }; | |
1387 | |
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1388 #ifndef PRODUCT |
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1389 class GenGCSaveTopsBeforeGCClosure: public GenCollectedHeap::GenClosure { |
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1390 private: |
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1391 public: |
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1392 void do_generation(Generation* gen) { |
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1393 gen->record_spaces_top(); |
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1394 } |
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1395 }; |
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1396 |
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1397 void GenCollectedHeap::record_gen_tops_before_GC() { |
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1398 if (ZapUnusedHeapArea) { |
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1399 GenGCSaveTopsBeforeGCClosure blk; |
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1400 generation_iterate(&blk, false); // not old-to-young. |
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1401 perm_gen()->record_spaces_top(); |
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1402 } |
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1403 } |
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1404 #endif // not PRODUCT |
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1405 |
0 | 1406 class GenEnsureParsabilityClosure: public GenCollectedHeap::GenClosure { |
1407 public: | |
1408 void do_generation(Generation* gen) { | |
1409 gen->ensure_parsability(); | |
1410 } | |
1411 }; | |
1412 | |
1413 void GenCollectedHeap::ensure_parsability(bool retire_tlabs) { | |
1414 CollectedHeap::ensure_parsability(retire_tlabs); | |
1415 GenEnsureParsabilityClosure ep_cl; | |
1416 generation_iterate(&ep_cl, false); | |
1417 perm_gen()->ensure_parsability(); | |
1418 } | |
1419 | |
1420 oop GenCollectedHeap::handle_failed_promotion(Generation* gen, | |
1421 oop obj, | |
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1422 size_t obj_size) { |
0 | 1423 assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
1424 HeapWord* result = NULL; | |
1425 | |
1426 // First give each higher generation a chance to allocate the promoted object. | |
1427 Generation* allocator = next_gen(gen); | |
1428 if (allocator != NULL) { | |
1429 do { | |
1430 result = allocator->allocate(obj_size, false); | |
1431 } while (result == NULL && (allocator = next_gen(allocator)) != NULL); | |
1432 } | |
1433 | |
1434 if (result == NULL) { | |
1435 // Then give gen and higher generations a chance to expand and allocate the | |
1436 // object. | |
1437 do { | |
1438 result = gen->expand_and_allocate(obj_size, false); | |
1439 } while (result == NULL && (gen = next_gen(gen)) != NULL); | |
1440 } | |
1441 | |
1442 if (result != NULL) { | |
1443 Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); | |
1444 } | |
1445 return oop(result); | |
1446 } | |
1447 | |
1448 class GenTimeOfLastGCClosure: public GenCollectedHeap::GenClosure { | |
1449 jlong _time; // in ms | |
1450 jlong _now; // in ms | |
1451 | |
1452 public: | |
1453 GenTimeOfLastGCClosure(jlong now) : _time(now), _now(now) { } | |
1454 | |
1455 jlong time() { return _time; } | |
1456 | |
1457 void do_generation(Generation* gen) { | |
1458 _time = MIN2(_time, gen->time_of_last_gc(_now)); | |
1459 } | |
1460 }; | |
1461 | |
1462 jlong GenCollectedHeap::millis_since_last_gc() { | |
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1463 // We need a monotonically non-deccreasing time in ms but |
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1464 // os::javaTimeMillis() does not guarantee monotonicity. |
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1465 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
0 | 1466 GenTimeOfLastGCClosure tolgc_cl(now); |
1467 // iterate over generations getting the oldest | |
1468 // time that a generation was collected | |
1469 generation_iterate(&tolgc_cl, false); | |
1470 tolgc_cl.do_generation(perm_gen()); | |
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1471 |
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1472 // javaTimeNanos() is guaranteed to be monotonically non-decreasing |
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1473 // provided the underlying platform provides such a time source |
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1474 // (and it is bug free). So we still have to guard against getting |
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1475 // back a time later than 'now'. |
0 | 1476 jlong retVal = now - tolgc_cl.time(); |
1477 if (retVal < 0) { | |
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1478 NOT_PRODUCT(warning("time warp: "INT64_FORMAT, retVal);) |
0 | 1479 return 0; |
1480 } | |
1481 return retVal; | |
1482 } |