Mercurial > hg > graal-compiler
annotate src/share/vm/memory/genCollectedHeap.cpp @ 1711:a6bff45449bc
6973570: OrderAccess::storestore() scales poorly on multi-socket x64 and sparc: cache-line ping-ponging
Summary: volatile store to static variable removed in favour of a volatile store to stack to avoid excessive cache coherency traffic; verified that the volatile store is not elided by any of our current compilers.
Reviewed-by: dholmes, dice, jcoomes, kvn
author | ysr |
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date | Tue, 10 Aug 2010 14:53:35 -0700 |
parents | 1a11430e0326 |
children | 126ea7725993 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2010, 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 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_genCollectedHeap.cpp.incl" | |
27 | |
28 GenCollectedHeap* GenCollectedHeap::_gch; | |
29 NOT_PRODUCT(size_t GenCollectedHeap::_skip_header_HeapWords = 0;) | |
30 | |
31 // The set of potentially parallel tasks in strong root scanning. | |
32 enum GCH_process_strong_roots_tasks { | |
33 // We probably want to parallelize both of these internally, but for now... | |
34 GCH_PS_younger_gens, | |
35 // Leave this one last. | |
36 GCH_PS_NumElements | |
37 }; | |
38 | |
39 GenCollectedHeap::GenCollectedHeap(GenCollectorPolicy *policy) : | |
40 SharedHeap(policy), | |
41 _gen_policy(policy), | |
42 _gen_process_strong_tasks(new SubTasksDone(GCH_PS_NumElements)), | |
43 _full_collections_completed(0) | |
44 { | |
45 if (_gen_process_strong_tasks == NULL || | |
46 !_gen_process_strong_tasks->valid()) { | |
47 vm_exit_during_initialization("Failed necessary allocation."); | |
48 } | |
49 assert(policy != NULL, "Sanity check"); | |
50 _preloading_shared_classes = false; | |
51 } | |
52 | |
53 jint GenCollectedHeap::initialize() { | |
1166 | 54 CollectedHeap::pre_initialize(); |
55 | |
0 | 56 int i; |
57 _n_gens = gen_policy()->number_of_generations(); | |
58 | |
59 // While there are no constraints in the GC code that HeapWordSize | |
60 // be any particular value, there are multiple other areas in the | |
61 // system which believe this to be true (e.g. oop->object_size in some | |
62 // cases incorrectly returns the size in wordSize units rather than | |
63 // HeapWordSize). | |
64 guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); | |
65 | |
66 // The heap must be at least as aligned as generations. | |
67 size_t alignment = Generation::GenGrain; | |
68 | |
69 _gen_specs = gen_policy()->generations(); | |
70 PermanentGenerationSpec *perm_gen_spec = | |
71 collector_policy()->permanent_generation(); | |
72 | |
73 // Make sure the sizes are all aligned. | |
74 for (i = 0; i < _n_gens; i++) { | |
75 _gen_specs[i]->align(alignment); | |
76 } | |
77 perm_gen_spec->align(alignment); | |
78 | |
79 // If we are dumping the heap, then allocate a wasted block of address | |
80 // space in order to push the heap to a lower address. This extra | |
81 // address range allows for other (or larger) libraries to be loaded | |
82 // without them occupying the space required for the shared spaces. | |
83 | |
84 if (DumpSharedSpaces) { | |
85 uintx reserved = 0; | |
86 uintx block_size = 64*1024*1024; | |
87 while (reserved < SharedDummyBlockSize) { | |
88 char* dummy = os::reserve_memory(block_size); | |
89 reserved += block_size; | |
90 } | |
91 } | |
92 | |
93 // Allocate space for the heap. | |
94 | |
95 char* heap_address; | |
96 size_t total_reserved = 0; | |
97 int n_covered_regions = 0; | |
98 ReservedSpace heap_rs(0); | |
99 | |
100 heap_address = allocate(alignment, perm_gen_spec, &total_reserved, | |
101 &n_covered_regions, &heap_rs); | |
102 | |
103 if (UseSharedSpaces) { | |
104 if (!heap_rs.is_reserved() || heap_address != heap_rs.base()) { | |
105 if (heap_rs.is_reserved()) { | |
106 heap_rs.release(); | |
107 } | |
108 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
109 mapinfo->fail_continue("Unable to reserve shared region."); | |
110 allocate(alignment, perm_gen_spec, &total_reserved, &n_covered_regions, | |
111 &heap_rs); | |
112 } | |
113 } | |
114 | |
115 if (!heap_rs.is_reserved()) { | |
116 vm_shutdown_during_initialization( | |
117 "Could not reserve enough space for object heap"); | |
118 return JNI_ENOMEM; | |
119 } | |
120 | |
121 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
122 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
123 | |
124 // It is important to do this in a way such that concurrent readers can't | |
125 // temporarily think somethings in the heap. (Seen this happen in asserts.) | |
126 _reserved.set_word_size(0); | |
127 _reserved.set_start((HeapWord*)heap_rs.base()); | |
128 size_t actual_heap_size = heap_rs.size() - perm_gen_spec->misc_data_size() | |
129 - perm_gen_spec->misc_code_size(); | |
130 _reserved.set_end((HeapWord*)(heap_rs.base() + actual_heap_size)); | |
131 | |
132 _rem_set = collector_policy()->create_rem_set(_reserved, n_covered_regions); | |
133 set_barrier_set(rem_set()->bs()); | |
1166 | 134 |
0 | 135 _gch = this; |
136 | |
137 for (i = 0; i < _n_gens; i++) { | |
138 ReservedSpace this_rs = heap_rs.first_part(_gen_specs[i]->max_size(), | |
139 UseSharedSpaces, UseSharedSpaces); | |
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 } | |
143 _perm_gen = perm_gen_spec->init(heap_rs, PermSize, rem_set()); | |
144 | |
145 clear_incremental_collection_will_fail(); | |
146 clear_last_incremental_collection_failed(); | |
147 | |
148 #ifndef SERIALGC | |
149 // If we are running CMS, create the collector responsible | |
150 // for collecting the CMS generations. | |
151 if (collector_policy()->is_concurrent_mark_sweep_policy()) { | |
152 bool success = create_cms_collector(); | |
153 if (!success) return JNI_ENOMEM; | |
154 } | |
155 #endif // SERIALGC | |
156 | |
157 return JNI_OK; | |
158 } | |
159 | |
160 | |
161 char* GenCollectedHeap::allocate(size_t alignment, | |
162 PermanentGenerationSpec* perm_gen_spec, | |
163 size_t* _total_reserved, | |
164 int* _n_covered_regions, | |
165 ReservedSpace* heap_rs){ | |
166 const char overflow_msg[] = "The size of the object heap + VM data exceeds " | |
167 "the maximum representable size"; | |
168 | |
169 // Now figure out the total size. | |
170 size_t total_reserved = 0; | |
171 int n_covered_regions = 0; | |
172 const size_t pageSize = UseLargePages ? | |
173 os::large_page_size() : os::vm_page_size(); | |
174 | |
175 for (int i = 0; i < _n_gens; i++) { | |
176 total_reserved += _gen_specs[i]->max_size(); | |
177 if (total_reserved < _gen_specs[i]->max_size()) { | |
178 vm_exit_during_initialization(overflow_msg); | |
179 } | |
180 n_covered_regions += _gen_specs[i]->n_covered_regions(); | |
181 } | |
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182 assert(total_reserved % pageSize == 0, |
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183 err_msg("Gen size; total_reserved=" SIZE_FORMAT ", pageSize=" |
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184 SIZE_FORMAT, total_reserved, pageSize)); |
0 | 185 total_reserved += perm_gen_spec->max_size(); |
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186 assert(total_reserved % pageSize == 0, |
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187 err_msg("Perm size; total_reserved=" SIZE_FORMAT ", pageSize=" |
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188 SIZE_FORMAT ", perm gen max=" SIZE_FORMAT, total_reserved, |
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189 pageSize, perm_gen_spec->max_size())); |
0 | 190 |
191 if (total_reserved < perm_gen_spec->max_size()) { | |
192 vm_exit_during_initialization(overflow_msg); | |
193 } | |
194 n_covered_regions += perm_gen_spec->n_covered_regions(); | |
195 | |
196 // Add the size of the data area which shares the same reserved area | |
197 // as the heap, but which is not actually part of the heap. | |
198 size_t s = perm_gen_spec->misc_data_size() + perm_gen_spec->misc_code_size(); | |
199 | |
200 total_reserved += s; | |
201 if (total_reserved < s) { | |
202 vm_exit_during_initialization(overflow_msg); | |
203 } | |
204 | |
205 if (UseLargePages) { | |
206 assert(total_reserved != 0, "total_reserved cannot be 0"); | |
207 total_reserved = round_to(total_reserved, os::large_page_size()); | |
208 if (total_reserved < os::large_page_size()) { | |
209 vm_exit_during_initialization(overflow_msg); | |
210 } | |
211 } | |
212 | |
213 // Calculate the address at which the heap must reside in order for | |
214 // the shared data to be at the required address. | |
215 | |
216 char* heap_address; | |
217 if (UseSharedSpaces) { | |
218 | |
219 // Calculate the address of the first word beyond the heap. | |
220 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
221 int lr = CompactingPermGenGen::n_regions - 1; | |
222 size_t capacity = align_size_up(mapinfo->space_capacity(lr), alignment); | |
223 heap_address = mapinfo->region_base(lr) + capacity; | |
224 | |
225 // Calculate the address of the first word of the heap. | |
226 heap_address -= total_reserved; | |
227 } else { | |
228 heap_address = NULL; // any address will do. | |
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229 if (UseCompressedOops) { |
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230 heap_address = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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231 *_total_reserved = total_reserved; |
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232 *_n_covered_regions = n_covered_regions; |
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233 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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234 UseLargePages, heap_address); |
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235 |
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236 if (heap_address != NULL && !heap_rs->is_reserved()) { |
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237 // Failed to reserve at specified address - the requested memory |
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238 // region is taken already, for example, by 'java' launcher. |
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239 // Try again to reserver heap higher. |
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240 heap_address = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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241 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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242 UseLargePages, heap_address); |
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243 |
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244 if (heap_address != NULL && !heap_rs->is_reserved()) { |
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245 // Failed to reserve at specified address again - give up. |
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246 heap_address = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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247 assert(heap_address == NULL, ""); |
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248 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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249 UseLargePages, heap_address); |
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250 } |
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251 } |
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252 return heap_address; |
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253 } |
0 | 254 } |
255 | |
256 *_total_reserved = total_reserved; | |
257 *_n_covered_regions = n_covered_regions; | |
237
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258 *heap_rs = ReservedHeapSpace(total_reserved, alignment, |
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259 UseLargePages, heap_address); |
0 | 260 |
261 return heap_address; | |
262 } | |
263 | |
264 | |
265 void GenCollectedHeap::post_initialize() { | |
266 SharedHeap::post_initialize(); | |
267 TwoGenerationCollectorPolicy *policy = | |
268 (TwoGenerationCollectorPolicy *)collector_policy(); | |
269 guarantee(policy->is_two_generation_policy(), "Illegal policy type"); | |
270 DefNewGeneration* def_new_gen = (DefNewGeneration*) get_gen(0); | |
271 assert(def_new_gen->kind() == Generation::DefNew || | |
272 def_new_gen->kind() == Generation::ParNew || | |
273 def_new_gen->kind() == Generation::ASParNew, | |
274 "Wrong generation kind"); | |
275 | |
276 Generation* old_gen = get_gen(1); | |
277 assert(old_gen->kind() == Generation::ConcurrentMarkSweep || | |
278 old_gen->kind() == Generation::ASConcurrentMarkSweep || | |
279 old_gen->kind() == Generation::MarkSweepCompact, | |
280 "Wrong generation kind"); | |
281 | |
282 policy->initialize_size_policy(def_new_gen->eden()->capacity(), | |
283 old_gen->capacity(), | |
284 def_new_gen->from()->capacity()); | |
285 policy->initialize_gc_policy_counters(); | |
286 } | |
287 | |
288 void GenCollectedHeap::ref_processing_init() { | |
289 SharedHeap::ref_processing_init(); | |
290 for (int i = 0; i < _n_gens; i++) { | |
291 _gens[i]->ref_processor_init(); | |
292 } | |
293 } | |
294 | |
295 size_t GenCollectedHeap::capacity() const { | |
296 size_t res = 0; | |
297 for (int i = 0; i < _n_gens; i++) { | |
298 res += _gens[i]->capacity(); | |
299 } | |
300 return res; | |
301 } | |
302 | |
303 size_t GenCollectedHeap::used() const { | |
304 size_t res = 0; | |
305 for (int i = 0; i < _n_gens; i++) { | |
306 res += _gens[i]->used(); | |
307 } | |
308 return res; | |
309 } | |
310 | |
311 // Save the "used_region" for generations level and lower, | |
312 // and, if perm is true, for perm gen. | |
313 void GenCollectedHeap::save_used_regions(int level, bool perm) { | |
314 assert(level < _n_gens, "Illegal level parameter"); | |
315 for (int i = level; i >= 0; i--) { | |
316 _gens[i]->save_used_region(); | |
317 } | |
318 if (perm) { | |
319 perm_gen()->save_used_region(); | |
320 } | |
321 } | |
322 | |
323 size_t GenCollectedHeap::max_capacity() const { | |
324 size_t res = 0; | |
325 for (int i = 0; i < _n_gens; i++) { | |
326 res += _gens[i]->max_capacity(); | |
327 } | |
328 return res; | |
329 } | |
330 | |
331 // Update the _full_collections_completed counter | |
332 // at the end of a stop-world full GC. | |
333 unsigned int GenCollectedHeap::update_full_collections_completed() { | |
334 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
335 assert(_full_collections_completed <= _total_full_collections, | |
336 "Can't complete more collections than were started"); | |
337 _full_collections_completed = _total_full_collections; | |
338 ml.notify_all(); | |
339 return _full_collections_completed; | |
340 } | |
341 | |
342 // Update the _full_collections_completed counter, as appropriate, | |
343 // at the end of a concurrent GC cycle. Note the conditional update | |
344 // below to allow this method to be called by a concurrent collector | |
345 // without synchronizing in any manner with the VM thread (which | |
346 // may already have initiated a STW full collection "concurrently"). | |
347 unsigned int GenCollectedHeap::update_full_collections_completed(unsigned int count) { | |
348 MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); | |
349 assert((_full_collections_completed <= _total_full_collections) && | |
350 (count <= _total_full_collections), | |
351 "Can't complete more collections than were started"); | |
352 if (count > _full_collections_completed) { | |
353 _full_collections_completed = count; | |
354 ml.notify_all(); | |
355 } | |
356 return _full_collections_completed; | |
357 } | |
358 | |
359 | |
360 #ifndef PRODUCT | |
361 // Override of memory state checking method in CollectedHeap: | |
362 // Some collectors (CMS for example) can't have badHeapWordVal written | |
363 // in the first two words of an object. (For instance , in the case of | |
364 // CMS these words hold state used to synchronize between certain | |
365 // (concurrent) GC steps and direct allocating mutators.) | |
366 // The skip_header_HeapWords() method below, allows us to skip | |
367 // over the requisite number of HeapWord's. Note that (for | |
368 // generational collectors) this means that those many words are | |
369 // skipped in each object, irrespective of the generation in which | |
370 // that object lives. The resultant loss of precision seems to be | |
371 // harmless and the pain of avoiding that imprecision appears somewhat | |
372 // higher than we are prepared to pay for such rudimentary debugging | |
373 // support. | |
374 void GenCollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, | |
375 size_t size) { | |
376 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
377 // We are asked to check a size in HeapWords, | |
378 // but the memory is mangled in juint words. | |
379 juint* start = (juint*) (addr + skip_header_HeapWords()); | |
380 juint* end = (juint*) (addr + size); | |
381 for (juint* slot = start; slot < end; slot += 1) { | |
382 assert(*slot == badHeapWordVal, | |
383 "Found non badHeapWordValue in pre-allocation check"); | |
384 } | |
385 } | |
386 } | |
387 #endif | |
388 | |
389 HeapWord* GenCollectedHeap::attempt_allocation(size_t size, | |
390 bool is_tlab, | |
391 bool first_only) { | |
392 HeapWord* res; | |
393 for (int i = 0; i < _n_gens; i++) { | |
394 if (_gens[i]->should_allocate(size, is_tlab)) { | |
395 res = _gens[i]->allocate(size, is_tlab); | |
396 if (res != NULL) return res; | |
397 else if (first_only) break; | |
398 } | |
399 } | |
400 // Otherwise... | |
401 return NULL; | |
402 } | |
403 | |
404 HeapWord* GenCollectedHeap::mem_allocate(size_t size, | |
405 bool is_large_noref, | |
406 bool is_tlab, | |
407 bool* gc_overhead_limit_was_exceeded) { | |
408 return collector_policy()->mem_allocate_work(size, | |
409 is_tlab, | |
410 gc_overhead_limit_was_exceeded); | |
411 } | |
412 | |
413 bool GenCollectedHeap::must_clear_all_soft_refs() { | |
414 return _gc_cause == GCCause::_last_ditch_collection; | |
415 } | |
416 | |
417 bool GenCollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { | |
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418 return UseConcMarkSweepGC && |
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419 ((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
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420 (cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
0 | 421 } |
422 | |
423 void GenCollectedHeap::do_collection(bool full, | |
424 bool clear_all_soft_refs, | |
425 size_t size, | |
426 bool is_tlab, | |
427 int max_level) { | |
428 bool prepared_for_verification = false; | |
429 ResourceMark rm; | |
430 DEBUG_ONLY(Thread* my_thread = Thread::current();) | |
431 | |
432 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
433 assert(my_thread->is_VM_thread() || | |
434 my_thread->is_ConcurrentGC_thread(), | |
435 "incorrect thread type capability"); | |
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436 assert(Heap_lock->is_locked(), |
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437 "the requesting thread should have the Heap_lock"); |
0 | 438 guarantee(!is_gc_active(), "collection is not reentrant"); |
439 assert(max_level < n_gens(), "sanity check"); | |
440 | |
441 if (GC_locker::check_active_before_gc()) { | |
442 return; // GC is disabled (e.g. JNI GetXXXCritical operation) | |
443 } | |
444 | |
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445 const bool do_clear_all_soft_refs = clear_all_soft_refs || |
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446 collector_policy()->should_clear_all_soft_refs(); |
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447 |
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448 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
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449 |
0 | 450 const size_t perm_prev_used = perm_gen()->used(); |
451 | |
452 if (PrintHeapAtGC) { | |
453 Universe::print_heap_before_gc(); | |
454 if (Verbose) { | |
455 gclog_or_tty->print_cr("GC Cause: %s", GCCause::to_string(gc_cause())); | |
456 } | |
457 } | |
458 | |
459 { | |
460 FlagSetting fl(_is_gc_active, true); | |
461 | |
462 bool complete = full && (max_level == (n_gens()-1)); | |
463 const char* gc_cause_str = "GC "; | |
464 if (complete) { | |
465 GCCause::Cause cause = gc_cause(); | |
466 if (cause == GCCause::_java_lang_system_gc) { | |
467 gc_cause_str = "Full GC (System) "; | |
468 } else { | |
469 gc_cause_str = "Full GC "; | |
470 } | |
471 } | |
472 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); | |
473 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); | |
474 TraceTime t(gc_cause_str, PrintGCDetails, false, gclog_or_tty); | |
475 | |
476 gc_prologue(complete); | |
477 increment_total_collections(complete); | |
478 | |
479 size_t gch_prev_used = used(); | |
480 | |
481 int starting_level = 0; | |
482 if (full) { | |
483 // Search for the oldest generation which will collect all younger | |
484 // generations, and start collection loop there. | |
485 for (int i = max_level; i >= 0; i--) { | |
486 if (_gens[i]->full_collects_younger_generations()) { | |
487 starting_level = i; | |
488 break; | |
489 } | |
490 } | |
491 } | |
492 | |
493 bool must_restore_marks_for_biased_locking = false; | |
494 | |
495 int max_level_collected = starting_level; | |
496 for (int i = starting_level; i <= max_level; i++) { | |
497 if (_gens[i]->should_collect(full, size, is_tlab)) { | |
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498 if (i == n_gens() - 1) { // a major collection is to happen |
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499 if (!complete) { |
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500 // The full_collections increment was missed above. |
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501 increment_total_full_collections(); |
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502 } |
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503 pre_full_gc_dump(); // do any pre full gc dumps |
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504 } |
0 | 505 // Timer for individual generations. Last argument is false: no CR |
506 TraceTime t1(_gens[i]->short_name(), PrintGCDetails, false, gclog_or_tty); | |
507 TraceCollectorStats tcs(_gens[i]->counters()); | |
508 TraceMemoryManagerStats tmms(_gens[i]->kind()); | |
509 | |
510 size_t prev_used = _gens[i]->used(); | |
511 _gens[i]->stat_record()->invocations++; | |
512 _gens[i]->stat_record()->accumulated_time.start(); | |
513 | |
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514 // Must be done anew before each collection because |
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515 // a previous collection will do mangling and will |
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516 // change top of some spaces. |
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517 record_gen_tops_before_GC(); |
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518 |
0 | 519 if (PrintGC && Verbose) { |
520 gclog_or_tty->print("level=%d invoke=%d size=" SIZE_FORMAT, | |
521 i, | |
522 _gens[i]->stat_record()->invocations, | |
523 size*HeapWordSize); | |
524 } | |
525 | |
526 if (VerifyBeforeGC && i >= VerifyGCLevel && | |
527 total_collections() >= VerifyGCStartAt) { | |
528 HandleMark hm; // Discard invalid handles created during verification | |
529 if (!prepared_for_verification) { | |
530 prepare_for_verify(); | |
531 prepared_for_verification = true; | |
532 } | |
533 gclog_or_tty->print(" VerifyBeforeGC:"); | |
534 Universe::verify(true); | |
535 } | |
536 COMPILER2_PRESENT(DerivedPointerTable::clear()); | |
537 | |
538 if (!must_restore_marks_for_biased_locking && | |
539 _gens[i]->performs_in_place_marking()) { | |
540 // We perform this mark word preservation work lazily | |
541 // because it's only at this point that we know whether we | |
542 // absolutely have to do it; we want to avoid doing it for | |
543 // scavenge-only collections where it's unnecessary | |
544 must_restore_marks_for_biased_locking = true; | |
545 BiasedLocking::preserve_marks(); | |
546 } | |
547 | |
548 // Do collection work | |
549 { | |
550 // Note on ref discovery: For what appear to be historical reasons, | |
551 // GCH enables and disabled (by enqueing) refs discovery. | |
552 // In the future this should be moved into the generation's | |
553 // collect method so that ref discovery and enqueueing concerns | |
554 // are local to a generation. The collect method could return | |
555 // an appropriate indication in the case that notification on | |
556 // the ref lock was needed. This will make the treatment of | |
557 // weak refs more uniform (and indeed remove such concerns | |
558 // from GCH). XXX | |
559 | |
560 HandleMark hm; // Discard invalid handles created during gc | |
561 save_marks(); // save marks for all gens | |
562 // We want to discover references, but not process them yet. | |
563 // This mode is disabled in process_discovered_references if the | |
564 // generation does some collection work, or in | |
565 // enqueue_discovered_references if the generation returns | |
566 // without doing any work. | |
567 ReferenceProcessor* rp = _gens[i]->ref_processor(); | |
568 // If the discovery of ("weak") refs in this generation is | |
569 // atomic wrt other collectors in this configuration, we | |
570 // are guaranteed to have empty discovered ref lists. | |
571 if (rp->discovery_is_atomic()) { | |
572 rp->verify_no_references_recorded(); | |
573 rp->enable_discovery(); | |
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574 rp->setup_policy(do_clear_all_soft_refs); |
0 | 575 } else { |
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576 // collect() below will enable discovery as appropriate |
0 | 577 } |
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578 _gens[i]->collect(full, do_clear_all_soft_refs, size, is_tlab); |
0 | 579 if (!rp->enqueuing_is_done()) { |
580 rp->enqueue_discovered_references(); | |
581 } else { | |
582 rp->set_enqueuing_is_done(false); | |
583 } | |
584 rp->verify_no_references_recorded(); | |
585 } | |
586 max_level_collected = i; | |
587 | |
588 // Determine if allocation request was met. | |
589 if (size > 0) { | |
590 if (!is_tlab || _gens[i]->supports_tlab_allocation()) { | |
591 if (size*HeapWordSize <= _gens[i]->unsafe_max_alloc_nogc()) { | |
592 size = 0; | |
593 } | |
594 } | |
595 } | |
596 | |
597 COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); | |
598 | |
599 _gens[i]->stat_record()->accumulated_time.stop(); | |
600 | |
601 update_gc_stats(i, full); | |
602 | |
603 if (VerifyAfterGC && i >= VerifyGCLevel && | |
604 total_collections() >= VerifyGCStartAt) { | |
605 HandleMark hm; // Discard invalid handles created during verification | |
606 gclog_or_tty->print(" VerifyAfterGC:"); | |
607 Universe::verify(false); | |
608 } | |
609 | |
610 if (PrintGCDetails) { | |
611 gclog_or_tty->print(":"); | |
612 _gens[i]->print_heap_change(prev_used); | |
613 } | |
614 } | |
615 } | |
616 | |
617 // Update "complete" boolean wrt what actually transpired -- | |
618 // for instance, a promotion failure could have led to | |
619 // a whole heap collection. | |
620 complete = complete || (max_level_collected == n_gens() - 1); | |
621 | |
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622 if (complete) { // We did a "major" collection |
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623 post_full_gc_dump(); // do any post full gc dumps |
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624 } |
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625 |
0 | 626 if (PrintGCDetails) { |
627 print_heap_change(gch_prev_used); | |
628 | |
629 // Print perm gen info for full GC with PrintGCDetails flag. | |
630 if (complete) { | |
631 print_perm_heap_change(perm_prev_used); | |
632 } | |
633 } | |
634 | |
635 for (int j = max_level_collected; j >= 0; j -= 1) { | |
636 // Adjust generation sizes. | |
637 _gens[j]->compute_new_size(); | |
638 } | |
639 | |
640 if (complete) { | |
641 // Ask the permanent generation to adjust size for full collections | |
642 perm()->compute_new_size(); | |
643 update_full_collections_completed(); | |
644 } | |
645 | |
646 // Track memory usage and detect low memory after GC finishes | |
647 MemoryService::track_memory_usage(); | |
648 | |
649 gc_epilogue(complete); | |
650 | |
651 if (must_restore_marks_for_biased_locking) { | |
652 BiasedLocking::restore_marks(); | |
653 } | |
654 } | |
655 | |
656 AdaptiveSizePolicy* sp = gen_policy()->size_policy(); | |
657 AdaptiveSizePolicyOutput(sp, total_collections()); | |
658 | |
659 if (PrintHeapAtGC) { | |
660 Universe::print_heap_after_gc(); | |
661 } | |
662 | |
546
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663 #ifdef TRACESPINNING |
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664 ParallelTaskTerminator::print_termination_counts(); |
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665 #endif |
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666 |
0 | 667 if (ExitAfterGCNum > 0 && total_collections() == ExitAfterGCNum) { |
668 tty->print_cr("Stopping after GC #%d", ExitAfterGCNum); | |
669 vm_exit(-1); | |
670 } | |
671 } | |
672 | |
673 HeapWord* GenCollectedHeap::satisfy_failed_allocation(size_t size, bool is_tlab) { | |
674 return collector_policy()->satisfy_failed_allocation(size, is_tlab); | |
675 } | |
676 | |
677 void GenCollectedHeap::set_par_threads(int t) { | |
678 SharedHeap::set_par_threads(t); | |
679 _gen_process_strong_tasks->set_par_threads(t); | |
680 } | |
681 | |
682 class AssertIsPermClosure: public OopClosure { | |
683 public: | |
684 void do_oop(oop* p) { | |
685 assert((*p) == NULL || (*p)->is_perm(), "Referent should be perm."); | |
686 } | |
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687 void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 688 }; |
689 static AssertIsPermClosure assert_is_perm_closure; | |
690 | |
691 void GenCollectedHeap:: | |
692 gen_process_strong_roots(int level, | |
693 bool younger_gens_as_roots, | |
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694 bool activate_scope, |
0 | 695 bool collecting_perm_gen, |
696 SharedHeap::ScanningOption so, | |
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697 OopsInGenClosure* not_older_gens, |
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698 bool do_code_roots, |
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699 OopsInGenClosure* older_gens) { |
0 | 700 // General strong roots. |
989
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701 |
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702 if (!do_code_roots) { |
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703 SharedHeap::process_strong_roots(activate_scope, collecting_perm_gen, so, |
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704 not_older_gens, NULL, older_gens); |
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705 } else { |
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706 bool do_code_marking = (activate_scope || nmethod::oops_do_marking_is_active()); |
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707 CodeBlobToOopClosure code_roots(not_older_gens, /*do_marking=*/ do_code_marking); |
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708 SharedHeap::process_strong_roots(activate_scope, collecting_perm_gen, so, |
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709 not_older_gens, &code_roots, older_gens); |
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710 } |
0 | 711 |
712 if (younger_gens_as_roots) { | |
713 if (!_gen_process_strong_tasks->is_task_claimed(GCH_PS_younger_gens)) { | |
714 for (int i = 0; i < level; i++) { | |
715 not_older_gens->set_generation(_gens[i]); | |
716 _gens[i]->oop_iterate(not_older_gens); | |
717 } | |
718 not_older_gens->reset_generation(); | |
719 } | |
720 } | |
721 // When collection is parallel, all threads get to cooperate to do | |
722 // older-gen scanning. | |
723 for (int i = level+1; i < _n_gens; i++) { | |
724 older_gens->set_generation(_gens[i]); | |
725 rem_set()->younger_refs_iterate(_gens[i], older_gens); | |
726 older_gens->reset_generation(); | |
727 } | |
728 | |
729 _gen_process_strong_tasks->all_tasks_completed(); | |
730 } | |
731 | |
732 void GenCollectedHeap::gen_process_weak_roots(OopClosure* root_closure, | |
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733 CodeBlobClosure* code_roots, |
0 | 734 OopClosure* non_root_closure) { |
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735 SharedHeap::process_weak_roots(root_closure, code_roots, non_root_closure); |
0 | 736 // "Local" "weak" refs |
737 for (int i = 0; i < _n_gens; i++) { | |
738 _gens[i]->ref_processor()->weak_oops_do(root_closure); | |
739 } | |
740 } | |
741 | |
742 #define GCH_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ | |
743 void GenCollectedHeap:: \ | |
744 oop_since_save_marks_iterate(int level, \ | |
745 OopClosureType* cur, \ | |
746 OopClosureType* older) { \ | |
747 _gens[level]->oop_since_save_marks_iterate##nv_suffix(cur); \ | |
748 for (int i = level+1; i < n_gens(); i++) { \ | |
749 _gens[i]->oop_since_save_marks_iterate##nv_suffix(older); \ | |
750 } \ | |
751 perm_gen()->oop_since_save_marks_iterate##nv_suffix(older); \ | |
752 } | |
753 | |
754 ALL_SINCE_SAVE_MARKS_CLOSURES(GCH_SINCE_SAVE_MARKS_ITERATE_DEFN) | |
755 | |
756 #undef GCH_SINCE_SAVE_MARKS_ITERATE_DEFN | |
757 | |
758 bool GenCollectedHeap::no_allocs_since_save_marks(int level) { | |
759 for (int i = level; i < _n_gens; i++) { | |
760 if (!_gens[i]->no_allocs_since_save_marks()) return false; | |
761 } | |
762 return perm_gen()->no_allocs_since_save_marks(); | |
763 } | |
764 | |
765 bool GenCollectedHeap::supports_inline_contig_alloc() const { | |
766 return _gens[0]->supports_inline_contig_alloc(); | |
767 } | |
768 | |
769 HeapWord** GenCollectedHeap::top_addr() const { | |
770 return _gens[0]->top_addr(); | |
771 } | |
772 | |
773 HeapWord** GenCollectedHeap::end_addr() const { | |
774 return _gens[0]->end_addr(); | |
775 } | |
776 | |
777 size_t GenCollectedHeap::unsafe_max_alloc() { | |
778 return _gens[0]->unsafe_max_alloc_nogc(); | |
779 } | |
780 | |
781 // public collection interfaces | |
782 | |
783 void GenCollectedHeap::collect(GCCause::Cause cause) { | |
784 if (should_do_concurrent_full_gc(cause)) { | |
785 #ifndef SERIALGC | |
786 // mostly concurrent full collection | |
787 collect_mostly_concurrent(cause); | |
788 #else // SERIALGC | |
789 ShouldNotReachHere(); | |
790 #endif // SERIALGC | |
791 } else { | |
792 #ifdef ASSERT | |
793 if (cause == GCCause::_scavenge_alot) { | |
794 // minor collection only | |
795 collect(cause, 0); | |
796 } else { | |
797 // Stop-the-world full collection | |
798 collect(cause, n_gens() - 1); | |
799 } | |
800 #else | |
801 // Stop-the-world full collection | |
802 collect(cause, n_gens() - 1); | |
803 #endif | |
804 } | |
805 } | |
806 | |
807 void GenCollectedHeap::collect(GCCause::Cause cause, int max_level) { | |
808 // The caller doesn't have the Heap_lock | |
809 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
810 MutexLocker ml(Heap_lock); | |
811 collect_locked(cause, max_level); | |
812 } | |
813 | |
814 // This interface assumes that it's being called by the | |
815 // vm thread. It collects the heap assuming that the | |
816 // heap lock is already held and that we are executing in | |
817 // the context of the vm thread. | |
818 void GenCollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
819 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
820 assert(Heap_lock->is_locked(), "Precondition#2"); | |
821 GCCauseSetter gcs(this, cause); | |
822 switch (cause) { | |
823 case GCCause::_heap_inspection: | |
824 case GCCause::_heap_dump: { | |
825 HandleMark hm; | |
826 do_full_collection(false, // don't clear all soft refs | |
827 n_gens() - 1); | |
828 break; | |
829 } | |
830 default: // XXX FIX ME | |
831 ShouldNotReachHere(); // Unexpected use of this function | |
832 } | |
833 } | |
834 | |
835 void GenCollectedHeap::collect_locked(GCCause::Cause cause) { | |
836 // The caller has the Heap_lock | |
837 assert(Heap_lock->owned_by_self(), "this thread should own the Heap_lock"); | |
838 collect_locked(cause, n_gens() - 1); | |
839 } | |
840 | |
841 // this is the private collection interface | |
842 // The Heap_lock is expected to be held on entry. | |
843 | |
844 void GenCollectedHeap::collect_locked(GCCause::Cause cause, int max_level) { | |
845 if (_preloading_shared_classes) { | |
846 warning("\nThe permanent generation is not large enough to preload " | |
847 "requested classes.\nUse -XX:PermSize= to increase the initial " | |
848 "size of the permanent generation.\n"); | |
849 vm_exit(2); | |
850 } | |
851 // Read the GC count while holding the Heap_lock | |
852 unsigned int gc_count_before = total_collections(); | |
853 unsigned int full_gc_count_before = total_full_collections(); | |
854 { | |
855 MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back | |
856 VM_GenCollectFull op(gc_count_before, full_gc_count_before, | |
857 cause, max_level); | |
858 VMThread::execute(&op); | |
859 } | |
860 } | |
861 | |
862 #ifndef SERIALGC | |
863 bool GenCollectedHeap::create_cms_collector() { | |
864 | |
865 assert(((_gens[1]->kind() == Generation::ConcurrentMarkSweep) || | |
866 (_gens[1]->kind() == Generation::ASConcurrentMarkSweep)) && | |
867 _perm_gen->as_gen()->kind() == Generation::ConcurrentMarkSweep, | |
868 "Unexpected generation kinds"); | |
869 // Skip two header words in the block content verification | |
870 NOT_PRODUCT(_skip_header_HeapWords = CMSCollector::skip_header_HeapWords();) | |
871 CMSCollector* collector = new CMSCollector( | |
872 (ConcurrentMarkSweepGeneration*)_gens[1], | |
873 (ConcurrentMarkSweepGeneration*)_perm_gen->as_gen(), | |
874 _rem_set->as_CardTableRS(), | |
875 (ConcurrentMarkSweepPolicy*) collector_policy()); | |
876 | |
877 if (collector == NULL || !collector->completed_initialization()) { | |
878 if (collector) { | |
879 delete collector; // Be nice in embedded situation | |
880 } | |
881 vm_shutdown_during_initialization("Could not create CMS collector"); | |
882 return false; | |
883 } | |
884 return true; // success | |
885 } | |
886 | |
887 void GenCollectedHeap::collect_mostly_concurrent(GCCause::Cause cause) { | |
888 assert(!Heap_lock->owned_by_self(), "Should not own Heap_lock"); | |
889 | |
890 MutexLocker ml(Heap_lock); | |
891 // Read the GC counts while holding the Heap_lock | |
892 unsigned int full_gc_count_before = total_full_collections(); | |
893 unsigned int gc_count_before = total_collections(); | |
894 { | |
895 MutexUnlocker mu(Heap_lock); | |
896 VM_GenCollectFullConcurrent op(gc_count_before, full_gc_count_before, cause); | |
897 VMThread::execute(&op); | |
898 } | |
899 } | |
900 #endif // SERIALGC | |
901 | |
902 | |
903 void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs, | |
904 int max_level) { | |
905 int local_max_level; | |
906 if (!incremental_collection_will_fail() && | |
907 gc_cause() == GCCause::_gc_locker) { | |
908 local_max_level = 0; | |
909 } else { | |
910 local_max_level = max_level; | |
911 } | |
912 | |
913 do_collection(true /* full */, | |
914 clear_all_soft_refs /* clear_all_soft_refs */, | |
915 0 /* size */, | |
916 false /* is_tlab */, | |
917 local_max_level /* max_level */); | |
918 // Hack XXX FIX ME !!! | |
919 // A scavenge may not have been attempted, or may have | |
920 // been attempted and failed, because the old gen was too full | |
921 if (local_max_level == 0 && gc_cause() == GCCause::_gc_locker && | |
922 incremental_collection_will_fail()) { | |
923 if (PrintGCDetails) { | |
924 gclog_or_tty->print_cr("GC locker: Trying a full collection " | |
925 "because scavenge failed"); | |
926 } | |
927 // This time allow the old gen to be collected as well | |
928 do_collection(true /* full */, | |
929 clear_all_soft_refs /* clear_all_soft_refs */, | |
930 0 /* size */, | |
931 false /* is_tlab */, | |
932 n_gens() - 1 /* max_level */); | |
933 } | |
934 } | |
935 | |
936 // Returns "TRUE" iff "p" points into the allocated area of the heap. | |
937 bool GenCollectedHeap::is_in(const void* p) const { | |
938 #ifndef ASSERT | |
939 guarantee(VerifyBeforeGC || | |
940 VerifyDuringGC || | |
941 VerifyBeforeExit || | |
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942 PrintAssembly || |
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943 tty->count() != 0 || // already printing |
0 | 944 VerifyAfterGC, "too expensive"); |
945 #endif | |
946 // This might be sped up with a cache of the last generation that | |
947 // answered yes. | |
948 for (int i = 0; i < _n_gens; i++) { | |
949 if (_gens[i]->is_in(p)) return true; | |
950 } | |
951 if (_perm_gen->as_gen()->is_in(p)) return true; | |
952 // Otherwise... | |
953 return false; | |
954 } | |
955 | |
956 // Returns "TRUE" iff "p" points into the allocated area of the heap. | |
957 bool GenCollectedHeap::is_in_youngest(void* p) { | |
958 return _gens[0]->is_in(p); | |
959 } | |
960 | |
961 void GenCollectedHeap::oop_iterate(OopClosure* cl) { | |
962 for (int i = 0; i < _n_gens; i++) { | |
963 _gens[i]->oop_iterate(cl); | |
964 } | |
965 } | |
966 | |
967 void GenCollectedHeap::oop_iterate(MemRegion mr, OopClosure* cl) { | |
968 for (int i = 0; i < _n_gens; i++) { | |
969 _gens[i]->oop_iterate(mr, cl); | |
970 } | |
971 } | |
972 | |
973 void GenCollectedHeap::object_iterate(ObjectClosure* cl) { | |
974 for (int i = 0; i < _n_gens; i++) { | |
975 _gens[i]->object_iterate(cl); | |
976 } | |
977 perm_gen()->object_iterate(cl); | |
978 } | |
979 | |
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980 void GenCollectedHeap::safe_object_iterate(ObjectClosure* cl) { |
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981 for (int i = 0; i < _n_gens; i++) { |
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982 _gens[i]->safe_object_iterate(cl); |
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983 } |
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984 perm_gen()->safe_object_iterate(cl); |
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985 } |
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986 |
0 | 987 void GenCollectedHeap::object_iterate_since_last_GC(ObjectClosure* cl) { |
988 for (int i = 0; i < _n_gens; i++) { | |
989 _gens[i]->object_iterate_since_last_GC(cl); | |
990 } | |
991 } | |
992 | |
993 Space* GenCollectedHeap::space_containing(const void* addr) const { | |
994 for (int i = 0; i < _n_gens; i++) { | |
995 Space* res = _gens[i]->space_containing(addr); | |
996 if (res != NULL) return res; | |
997 } | |
998 Space* res = perm_gen()->space_containing(addr); | |
999 if (res != NULL) return res; | |
1000 // Otherwise... | |
1001 assert(false, "Could not find containing space"); | |
1002 return NULL; | |
1003 } | |
1004 | |
1005 | |
1006 HeapWord* GenCollectedHeap::block_start(const void* addr) const { | |
1007 assert(is_in_reserved(addr), "block_start of address outside of heap"); | |
1008 for (int i = 0; i < _n_gens; i++) { | |
1009 if (_gens[i]->is_in_reserved(addr)) { | |
1010 assert(_gens[i]->is_in(addr), | |
1011 "addr should be in allocated part of generation"); | |
1012 return _gens[i]->block_start(addr); | |
1013 } | |
1014 } | |
1015 if (perm_gen()->is_in_reserved(addr)) { | |
1016 assert(perm_gen()->is_in(addr), | |
1017 "addr should be in allocated part of perm gen"); | |
1018 return perm_gen()->block_start(addr); | |
1019 } | |
1020 assert(false, "Some generation should contain the address"); | |
1021 return NULL; | |
1022 } | |
1023 | |
1024 size_t GenCollectedHeap::block_size(const HeapWord* addr) const { | |
1025 assert(is_in_reserved(addr), "block_size of address outside of heap"); | |
1026 for (int i = 0; i < _n_gens; i++) { | |
1027 if (_gens[i]->is_in_reserved(addr)) { | |
1028 assert(_gens[i]->is_in(addr), | |
1029 "addr should be in allocated part of generation"); | |
1030 return _gens[i]->block_size(addr); | |
1031 } | |
1032 } | |
1033 if (perm_gen()->is_in_reserved(addr)) { | |
1034 assert(perm_gen()->is_in(addr), | |
1035 "addr should be in allocated part of perm gen"); | |
1036 return perm_gen()->block_size(addr); | |
1037 } | |
1038 assert(false, "Some generation should contain the address"); | |
1039 return 0; | |
1040 } | |
1041 | |
1042 bool GenCollectedHeap::block_is_obj(const HeapWord* addr) const { | |
1043 assert(is_in_reserved(addr), "block_is_obj of address outside of heap"); | |
1044 assert(block_start(addr) == addr, "addr must be a block start"); | |
1045 for (int i = 0; i < _n_gens; i++) { | |
1046 if (_gens[i]->is_in_reserved(addr)) { | |
1047 return _gens[i]->block_is_obj(addr); | |
1048 } | |
1049 } | |
1050 if (perm_gen()->is_in_reserved(addr)) { | |
1051 return perm_gen()->block_is_obj(addr); | |
1052 } | |
1053 assert(false, "Some generation should contain the address"); | |
1054 return false; | |
1055 } | |
1056 | |
1057 bool GenCollectedHeap::supports_tlab_allocation() const { | |
1058 for (int i = 0; i < _n_gens; i += 1) { | |
1059 if (_gens[i]->supports_tlab_allocation()) { | |
1060 return true; | |
1061 } | |
1062 } | |
1063 return false; | |
1064 } | |
1065 | |
1066 size_t GenCollectedHeap::tlab_capacity(Thread* thr) const { | |
1067 size_t result = 0; | |
1068 for (int i = 0; i < _n_gens; i += 1) { | |
1069 if (_gens[i]->supports_tlab_allocation()) { | |
1070 result += _gens[i]->tlab_capacity(); | |
1071 } | |
1072 } | |
1073 return result; | |
1074 } | |
1075 | |
1076 size_t GenCollectedHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
1077 size_t result = 0; | |
1078 for (int i = 0; i < _n_gens; i += 1) { | |
1079 if (_gens[i]->supports_tlab_allocation()) { | |
1080 result += _gens[i]->unsafe_max_tlab_alloc(); | |
1081 } | |
1082 } | |
1083 return result; | |
1084 } | |
1085 | |
1086 HeapWord* GenCollectedHeap::allocate_new_tlab(size_t size) { | |
1087 bool gc_overhead_limit_was_exceeded; | |
1088 HeapWord* result = mem_allocate(size /* size */, | |
1089 false /* is_large_noref */, | |
1090 true /* is_tlab */, | |
1091 &gc_overhead_limit_was_exceeded); | |
1092 return result; | |
1093 } | |
1094 | |
1095 // Requires "*prev_ptr" to be non-NULL. Deletes and a block of minimal size | |
1096 // from the list headed by "*prev_ptr". | |
1097 static ScratchBlock *removeSmallestScratch(ScratchBlock **prev_ptr) { | |
1098 bool first = true; | |
1099 size_t min_size = 0; // "first" makes this conceptually infinite. | |
1100 ScratchBlock **smallest_ptr, *smallest; | |
1101 ScratchBlock *cur = *prev_ptr; | |
1102 while (cur) { | |
1103 assert(*prev_ptr == cur, "just checking"); | |
1104 if (first || cur->num_words < min_size) { | |
1105 smallest_ptr = prev_ptr; | |
1106 smallest = cur; | |
1107 min_size = smallest->num_words; | |
1108 first = false; | |
1109 } | |
1110 prev_ptr = &cur->next; | |
1111 cur = cur->next; | |
1112 } | |
1113 smallest = *smallest_ptr; | |
1114 *smallest_ptr = smallest->next; | |
1115 return smallest; | |
1116 } | |
1117 | |
1118 // Sort the scratch block list headed by res into decreasing size order, | |
1119 // and set "res" to the result. | |
1120 static void sort_scratch_list(ScratchBlock*& list) { | |
1121 ScratchBlock* sorted = NULL; | |
1122 ScratchBlock* unsorted = list; | |
1123 while (unsorted) { | |
1124 ScratchBlock *smallest = removeSmallestScratch(&unsorted); | |
1125 smallest->next = sorted; | |
1126 sorted = smallest; | |
1127 } | |
1128 list = sorted; | |
1129 } | |
1130 | |
1131 ScratchBlock* GenCollectedHeap::gather_scratch(Generation* requestor, | |
1132 size_t max_alloc_words) { | |
1133 ScratchBlock* res = NULL; | |
1134 for (int i = 0; i < _n_gens; i++) { | |
1135 _gens[i]->contribute_scratch(res, requestor, max_alloc_words); | |
1136 } | |
1137 sort_scratch_list(res); | |
1138 return res; | |
1139 } | |
1140 | |
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1141 void GenCollectedHeap::release_scratch() { |
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1142 for (int i = 0; i < _n_gens; i++) { |
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1143 _gens[i]->reset_scratch(); |
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1144 } |
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1145 } |
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1146 |
0 | 1147 size_t GenCollectedHeap::large_typearray_limit() { |
1148 return gen_policy()->large_typearray_limit(); | |
1149 } | |
1150 | |
1151 class GenPrepareForVerifyClosure: public GenCollectedHeap::GenClosure { | |
1152 void do_generation(Generation* gen) { | |
1153 gen->prepare_for_verify(); | |
1154 } | |
1155 }; | |
1156 | |
1157 void GenCollectedHeap::prepare_for_verify() { | |
1158 ensure_parsability(false); // no need to retire TLABs | |
1159 GenPrepareForVerifyClosure blk; | |
1160 generation_iterate(&blk, false); | |
1161 perm_gen()->prepare_for_verify(); | |
1162 } | |
1163 | |
1164 | |
1165 void GenCollectedHeap::generation_iterate(GenClosure* cl, | |
1166 bool old_to_young) { | |
1167 if (old_to_young) { | |
1168 for (int i = _n_gens-1; i >= 0; i--) { | |
1169 cl->do_generation(_gens[i]); | |
1170 } | |
1171 } else { | |
1172 for (int i = 0; i < _n_gens; i++) { | |
1173 cl->do_generation(_gens[i]); | |
1174 } | |
1175 } | |
1176 } | |
1177 | |
1178 void GenCollectedHeap::space_iterate(SpaceClosure* cl) { | |
1179 for (int i = 0; i < _n_gens; i++) { | |
1180 _gens[i]->space_iterate(cl, true); | |
1181 } | |
1182 perm_gen()->space_iterate(cl, true); | |
1183 } | |
1184 | |
1185 bool GenCollectedHeap::is_maximal_no_gc() const { | |
1186 for (int i = 0; i < _n_gens; i++) { // skip perm gen | |
1187 if (!_gens[i]->is_maximal_no_gc()) { | |
1188 return false; | |
1189 } | |
1190 } | |
1191 return true; | |
1192 } | |
1193 | |
1194 void GenCollectedHeap::save_marks() { | |
1195 for (int i = 0; i < _n_gens; i++) { | |
1196 _gens[i]->save_marks(); | |
1197 } | |
1198 perm_gen()->save_marks(); | |
1199 } | |
1200 | |
1201 void GenCollectedHeap::compute_new_generation_sizes(int collectedGen) { | |
1202 for (int i = 0; i <= collectedGen; i++) { | |
1203 _gens[i]->compute_new_size(); | |
1204 } | |
1205 } | |
1206 | |
1207 GenCollectedHeap* GenCollectedHeap::heap() { | |
1208 assert(_gch != NULL, "Uninitialized access to GenCollectedHeap::heap()"); | |
1209 assert(_gch->kind() == CollectedHeap::GenCollectedHeap, "not a generational heap"); | |
1210 return _gch; | |
1211 } | |
1212 | |
1213 | |
1214 void GenCollectedHeap::prepare_for_compaction() { | |
1215 Generation* scanning_gen = _gens[_n_gens-1]; | |
1216 // Start by compacting into same gen. | |
1217 CompactPoint cp(scanning_gen, NULL, NULL); | |
1218 while (scanning_gen != NULL) { | |
1219 scanning_gen->prepare_for_compaction(&cp); | |
1220 scanning_gen = prev_gen(scanning_gen); | |
1221 } | |
1222 } | |
1223 | |
1224 GCStats* GenCollectedHeap::gc_stats(int level) const { | |
1225 return _gens[level]->gc_stats(); | |
1226 } | |
1227 | |
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1228 void GenCollectedHeap::verify(bool allow_dirty, bool silent, bool option /* ignored */) { |
0 | 1229 if (!silent) { |
1230 gclog_or_tty->print("permgen "); | |
1231 } | |
1232 perm_gen()->verify(allow_dirty); | |
1233 for (int i = _n_gens-1; i >= 0; i--) { | |
1234 Generation* g = _gens[i]; | |
1235 if (!silent) { | |
1236 gclog_or_tty->print(g->name()); | |
1237 gclog_or_tty->print(" "); | |
1238 } | |
1239 g->verify(allow_dirty); | |
1240 } | |
1241 if (!silent) { | |
1242 gclog_or_tty->print("remset "); | |
1243 } | |
1244 rem_set()->verify(); | |
1245 if (!silent) { | |
1246 gclog_or_tty->print("ref_proc "); | |
1247 } | |
1248 ReferenceProcessor::verify(); | |
1249 } | |
1250 | |
1251 void GenCollectedHeap::print() const { print_on(tty); } | |
1252 void GenCollectedHeap::print_on(outputStream* st) const { | |
1253 for (int i = 0; i < _n_gens; i++) { | |
1254 _gens[i]->print_on(st); | |
1255 } | |
1256 perm_gen()->print_on(st); | |
1257 } | |
1258 | |
1259 void GenCollectedHeap::gc_threads_do(ThreadClosure* tc) const { | |
1260 if (workers() != NULL) { | |
1261 workers()->threads_do(tc); | |
1262 } | |
1263 #ifndef SERIALGC | |
1264 if (UseConcMarkSweepGC) { | |
1265 ConcurrentMarkSweepThread::threads_do(tc); | |
1266 } | |
1267 #endif // SERIALGC | |
1268 } | |
1269 | |
1270 void GenCollectedHeap::print_gc_threads_on(outputStream* st) const { | |
1271 #ifndef SERIALGC | |
1272 if (UseParNewGC) { | |
1273 workers()->print_worker_threads_on(st); | |
1274 } | |
1275 if (UseConcMarkSweepGC) { | |
1276 ConcurrentMarkSweepThread::print_all_on(st); | |
1277 } | |
1278 #endif // SERIALGC | |
1279 } | |
1280 | |
1281 void GenCollectedHeap::print_tracing_info() const { | |
1282 if (TraceGen0Time) { | |
1283 get_gen(0)->print_summary_info(); | |
1284 } | |
1285 if (TraceGen1Time) { | |
1286 get_gen(1)->print_summary_info(); | |
1287 } | |
1288 } | |
1289 | |
1290 void GenCollectedHeap::print_heap_change(size_t prev_used) const { | |
1291 if (PrintGCDetails && Verbose) { | |
1292 gclog_or_tty->print(" " SIZE_FORMAT | |
1293 "->" SIZE_FORMAT | |
1294 "(" SIZE_FORMAT ")", | |
1295 prev_used, used(), capacity()); | |
1296 } else { | |
1297 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
1298 "->" SIZE_FORMAT "K" | |
1299 "(" SIZE_FORMAT "K)", | |
1300 prev_used / K, used() / K, capacity() / K); | |
1301 } | |
1302 } | |
1303 | |
1304 //New method to print perm gen info with PrintGCDetails flag | |
1305 void GenCollectedHeap::print_perm_heap_change(size_t perm_prev_used) const { | |
1306 gclog_or_tty->print(", [%s :", perm_gen()->short_name()); | |
1307 perm_gen()->print_heap_change(perm_prev_used); | |
1308 gclog_or_tty->print("]"); | |
1309 } | |
1310 | |
1311 class GenGCPrologueClosure: public GenCollectedHeap::GenClosure { | |
1312 private: | |
1313 bool _full; | |
1314 public: | |
1315 void do_generation(Generation* gen) { | |
1316 gen->gc_prologue(_full); | |
1317 } | |
1318 GenGCPrologueClosure(bool full) : _full(full) {}; | |
1319 }; | |
1320 | |
1321 void GenCollectedHeap::gc_prologue(bool full) { | |
1322 assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); | |
1323 | |
1324 always_do_update_barrier = false; | |
1325 // Fill TLAB's and such | |
1326 CollectedHeap::accumulate_statistics_all_tlabs(); | |
1327 ensure_parsability(true); // retire TLABs | |
1328 | |
1329 // Call allocation profiler | |
1330 AllocationProfiler::iterate_since_last_gc(); | |
1331 // Walk generations | |
1332 GenGCPrologueClosure blk(full); | |
1333 generation_iterate(&blk, false); // not old-to-young. | |
1334 perm_gen()->gc_prologue(full); | |
1335 }; | |
1336 | |
1337 class GenGCEpilogueClosure: public GenCollectedHeap::GenClosure { | |
1338 private: | |
1339 bool _full; | |
1340 public: | |
1341 void do_generation(Generation* gen) { | |
1342 gen->gc_epilogue(_full); | |
1343 } | |
1344 GenGCEpilogueClosure(bool full) : _full(full) {}; | |
1345 }; | |
1346 | |
1347 void GenCollectedHeap::gc_epilogue(bool full) { | |
1348 // Remember if a partial collection of the heap failed, and | |
1349 // we did a complete collection. | |
1350 if (full && incremental_collection_will_fail()) { | |
1351 set_last_incremental_collection_failed(); | |
1352 } else { | |
1353 clear_last_incremental_collection_failed(); | |
1354 } | |
1355 // Clear the flag, if set; the generation gc_epilogues will set the | |
1356 // flag again if the condition persists despite the collection. | |
1357 clear_incremental_collection_will_fail(); | |
1358 | |
1359 #ifdef COMPILER2 | |
1360 assert(DerivedPointerTable::is_empty(), "derived pointer present"); | |
1361 size_t actual_gap = pointer_delta((HeapWord*) (max_uintx-3), *(end_addr())); | |
1362 guarantee(actual_gap > (size_t)FastAllocateSizeLimit, "inline allocation wraps"); | |
1363 #endif /* COMPILER2 */ | |
1364 | |
1365 resize_all_tlabs(); | |
1366 | |
1367 GenGCEpilogueClosure blk(full); | |
1368 generation_iterate(&blk, false); // not old-to-young. | |
1369 perm_gen()->gc_epilogue(full); | |
1370 | |
1371 always_do_update_barrier = UseConcMarkSweepGC; | |
1372 }; | |
1373 | |
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1374 #ifndef PRODUCT |
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1375 class GenGCSaveTopsBeforeGCClosure: public GenCollectedHeap::GenClosure { |
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1376 private: |
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1377 public: |
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1378 void do_generation(Generation* gen) { |
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1379 gen->record_spaces_top(); |
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1380 } |
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1381 }; |
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1382 |
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1383 void GenCollectedHeap::record_gen_tops_before_GC() { |
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1384 if (ZapUnusedHeapArea) { |
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1385 GenGCSaveTopsBeforeGCClosure blk; |
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1386 generation_iterate(&blk, false); // not old-to-young. |
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1387 perm_gen()->record_spaces_top(); |
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1388 } |
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1389 } |
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1390 #endif // not PRODUCT |
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1391 |
0 | 1392 class GenEnsureParsabilityClosure: public GenCollectedHeap::GenClosure { |
1393 public: | |
1394 void do_generation(Generation* gen) { | |
1395 gen->ensure_parsability(); | |
1396 } | |
1397 }; | |
1398 | |
1399 void GenCollectedHeap::ensure_parsability(bool retire_tlabs) { | |
1400 CollectedHeap::ensure_parsability(retire_tlabs); | |
1401 GenEnsureParsabilityClosure ep_cl; | |
1402 generation_iterate(&ep_cl, false); | |
1403 perm_gen()->ensure_parsability(); | |
1404 } | |
1405 | |
1406 oop GenCollectedHeap::handle_failed_promotion(Generation* gen, | |
1407 oop obj, | |
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1408 size_t obj_size) { |
0 | 1409 assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
1410 HeapWord* result = NULL; | |
1411 | |
1412 // First give each higher generation a chance to allocate the promoted object. | |
1413 Generation* allocator = next_gen(gen); | |
1414 if (allocator != NULL) { | |
1415 do { | |
1416 result = allocator->allocate(obj_size, false); | |
1417 } while (result == NULL && (allocator = next_gen(allocator)) != NULL); | |
1418 } | |
1419 | |
1420 if (result == NULL) { | |
1421 // Then give gen and higher generations a chance to expand and allocate the | |
1422 // object. | |
1423 do { | |
1424 result = gen->expand_and_allocate(obj_size, false); | |
1425 } while (result == NULL && (gen = next_gen(gen)) != NULL); | |
1426 } | |
1427 | |
1428 if (result != NULL) { | |
1429 Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); | |
1430 } | |
1431 return oop(result); | |
1432 } | |
1433 | |
1434 class GenTimeOfLastGCClosure: public GenCollectedHeap::GenClosure { | |
1435 jlong _time; // in ms | |
1436 jlong _now; // in ms | |
1437 | |
1438 public: | |
1439 GenTimeOfLastGCClosure(jlong now) : _time(now), _now(now) { } | |
1440 | |
1441 jlong time() { return _time; } | |
1442 | |
1443 void do_generation(Generation* gen) { | |
1444 _time = MIN2(_time, gen->time_of_last_gc(_now)); | |
1445 } | |
1446 }; | |
1447 | |
1448 jlong GenCollectedHeap::millis_since_last_gc() { | |
1449 jlong now = os::javaTimeMillis(); | |
1450 GenTimeOfLastGCClosure tolgc_cl(now); | |
1451 // iterate over generations getting the oldest | |
1452 // time that a generation was collected | |
1453 generation_iterate(&tolgc_cl, false); | |
1454 tolgc_cl.do_generation(perm_gen()); | |
1455 // XXX Despite the assert above, since javaTimeMillis() | |
1456 // doesnot guarantee monotonically increasing return | |
1457 // values (note, i didn't say "strictly monotonic"), | |
1458 // we need to guard against getting back a time | |
1459 // later than now. This should be fixed by basing | |
1460 // on someting like gethrtime() which guarantees | |
1461 // monotonicity. Note that cond_wait() is susceptible | |
1462 // to a similar problem, because its interface is | |
1463 // based on absolute time in the form of the | |
1464 // system time's notion of UCT. See also 4506635 | |
1465 // for yet another problem of similar nature. XXX | |
1466 jlong retVal = now - tolgc_cl.time(); | |
1467 if (retVal < 0) { | |
1468 NOT_PRODUCT(warning("time warp: %d", retVal);) | |
1469 return 0; | |
1470 } | |
1471 return retVal; | |
1472 } |