Mercurial > hg > truffle
annotate src/share/vm/memory/defNewGeneration.cpp @ 242:d95b224e9f17
6721093: -XX:AppendRatio=N not supported
Summary: Add mechanism to ignore unsupported flags for a set period of time
Reviewed-by: acorn, never, coleenp
author | kamg |
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date | Mon, 28 Jul 2008 14:07:44 -0400 |
parents | d1605aabd0a1 |
children | 850fdf70db2b |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 2001-2008 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_defNewGeneration.cpp.incl" | |
27 | |
28 // | |
29 // DefNewGeneration functions. | |
30 | |
31 // Methods of protected closure types. | |
32 | |
33 DefNewGeneration::IsAliveClosure::IsAliveClosure(Generation* g) : _g(g) { | |
34 assert(g->level() == 0, "Optimized for youngest gen."); | |
35 } | |
36 void DefNewGeneration::IsAliveClosure::do_object(oop p) { | |
37 assert(false, "Do not call."); | |
38 } | |
39 bool DefNewGeneration::IsAliveClosure::do_object_b(oop p) { | |
40 return (HeapWord*)p >= _g->reserved().end() || p->is_forwarded(); | |
41 } | |
42 | |
43 DefNewGeneration::KeepAliveClosure:: | |
44 KeepAliveClosure(ScanWeakRefClosure* cl) : _cl(cl) { | |
45 GenRemSet* rs = GenCollectedHeap::heap()->rem_set(); | |
46 assert(rs->rs_kind() == GenRemSet::CardTable, "Wrong rem set kind."); | |
47 _rs = (CardTableRS*)rs; | |
48 } | |
49 | |
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50 void DefNewGeneration::KeepAliveClosure::do_oop(oop* p) { DefNewGeneration::KeepAliveClosure::do_oop_work(p); } |
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51 void DefNewGeneration::KeepAliveClosure::do_oop(narrowOop* p) { DefNewGeneration::KeepAliveClosure::do_oop_work(p); } |
0 | 52 |
53 | |
54 DefNewGeneration::FastKeepAliveClosure:: | |
55 FastKeepAliveClosure(DefNewGeneration* g, ScanWeakRefClosure* cl) : | |
56 DefNewGeneration::KeepAliveClosure(cl) { | |
57 _boundary = g->reserved().end(); | |
58 } | |
59 | |
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60 void DefNewGeneration::FastKeepAliveClosure::do_oop(oop* p) { DefNewGeneration::FastKeepAliveClosure::do_oop_work(p); } |
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61 void DefNewGeneration::FastKeepAliveClosure::do_oop(narrowOop* p) { DefNewGeneration::FastKeepAliveClosure::do_oop_work(p); } |
0 | 62 |
63 DefNewGeneration::EvacuateFollowersClosure:: | |
64 EvacuateFollowersClosure(GenCollectedHeap* gch, int level, | |
65 ScanClosure* cur, ScanClosure* older) : | |
66 _gch(gch), _level(level), | |
67 _scan_cur_or_nonheap(cur), _scan_older(older) | |
68 {} | |
69 | |
70 void DefNewGeneration::EvacuateFollowersClosure::do_void() { | |
71 do { | |
72 _gch->oop_since_save_marks_iterate(_level, _scan_cur_or_nonheap, | |
73 _scan_older); | |
74 } while (!_gch->no_allocs_since_save_marks(_level)); | |
75 } | |
76 | |
77 DefNewGeneration::FastEvacuateFollowersClosure:: | |
78 FastEvacuateFollowersClosure(GenCollectedHeap* gch, int level, | |
79 DefNewGeneration* gen, | |
80 FastScanClosure* cur, FastScanClosure* older) : | |
81 _gch(gch), _level(level), _gen(gen), | |
82 _scan_cur_or_nonheap(cur), _scan_older(older) | |
83 {} | |
84 | |
85 void DefNewGeneration::FastEvacuateFollowersClosure::do_void() { | |
86 do { | |
87 _gch->oop_since_save_marks_iterate(_level, _scan_cur_or_nonheap, | |
88 _scan_older); | |
89 } while (!_gch->no_allocs_since_save_marks(_level)); | |
90 guarantee(_gen->promo_failure_scan_stack() == NULL | |
91 || _gen->promo_failure_scan_stack()->length() == 0, | |
92 "Failed to finish scan"); | |
93 } | |
94 | |
95 ScanClosure::ScanClosure(DefNewGeneration* g, bool gc_barrier) : | |
96 OopsInGenClosure(g), _g(g), _gc_barrier(gc_barrier) | |
97 { | |
98 assert(_g->level() == 0, "Optimized for youngest generation"); | |
99 _boundary = _g->reserved().end(); | |
100 } | |
101 | |
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102 void ScanClosure::do_oop(oop* p) { ScanClosure::do_oop_work(p); } |
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103 void ScanClosure::do_oop(narrowOop* p) { ScanClosure::do_oop_work(p); } |
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104 |
0 | 105 FastScanClosure::FastScanClosure(DefNewGeneration* g, bool gc_barrier) : |
106 OopsInGenClosure(g), _g(g), _gc_barrier(gc_barrier) | |
107 { | |
108 assert(_g->level() == 0, "Optimized for youngest generation"); | |
109 _boundary = _g->reserved().end(); | |
110 } | |
111 | |
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112 void FastScanClosure::do_oop(oop* p) { FastScanClosure::do_oop_work(p); } |
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113 void FastScanClosure::do_oop(narrowOop* p) { FastScanClosure::do_oop_work(p); } |
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114 |
0 | 115 ScanWeakRefClosure::ScanWeakRefClosure(DefNewGeneration* g) : |
116 OopClosure(g->ref_processor()), _g(g) | |
117 { | |
118 assert(_g->level() == 0, "Optimized for youngest generation"); | |
119 _boundary = _g->reserved().end(); | |
120 } | |
121 | |
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122 void ScanWeakRefClosure::do_oop(oop* p) { ScanWeakRefClosure::do_oop_work(p); } |
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123 void ScanWeakRefClosure::do_oop(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); } |
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124 |
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125 void FilteringClosure::do_oop(oop* p) { FilteringClosure::do_oop_work(p); } |
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126 void FilteringClosure::do_oop(narrowOop* p) { FilteringClosure::do_oop_work(p); } |
0 | 127 |
128 DefNewGeneration::DefNewGeneration(ReservedSpace rs, | |
129 size_t initial_size, | |
130 int level, | |
131 const char* policy) | |
132 : Generation(rs, initial_size, level), | |
133 _objs_with_preserved_marks(NULL), | |
134 _preserved_marks_of_objs(NULL), | |
135 _promo_failure_scan_stack(NULL), | |
136 _promo_failure_drain_in_progress(false), | |
137 _should_allocate_from_space(false) | |
138 { | |
139 MemRegion cmr((HeapWord*)_virtual_space.low(), | |
140 (HeapWord*)_virtual_space.high()); | |
141 Universe::heap()->barrier_set()->resize_covered_region(cmr); | |
142 | |
143 if (GenCollectedHeap::heap()->collector_policy()->has_soft_ended_eden()) { | |
144 _eden_space = new ConcEdenSpace(this); | |
145 } else { | |
146 _eden_space = new EdenSpace(this); | |
147 } | |
148 _from_space = new ContiguousSpace(); | |
149 _to_space = new ContiguousSpace(); | |
150 | |
151 if (_eden_space == NULL || _from_space == NULL || _to_space == NULL) | |
152 vm_exit_during_initialization("Could not allocate a new gen space"); | |
153 | |
154 // Compute the maximum eden and survivor space sizes. These sizes | |
155 // are computed assuming the entire reserved space is committed. | |
156 // These values are exported as performance counters. | |
157 uintx alignment = GenCollectedHeap::heap()->collector_policy()->min_alignment(); | |
158 uintx size = _virtual_space.reserved_size(); | |
159 _max_survivor_size = compute_survivor_size(size, alignment); | |
160 _max_eden_size = size - (2*_max_survivor_size); | |
161 | |
162 // allocate the performance counters | |
163 | |
164 // Generation counters -- generation 0, 3 subspaces | |
165 _gen_counters = new GenerationCounters("new", 0, 3, &_virtual_space); | |
166 _gc_counters = new CollectorCounters(policy, 0); | |
167 | |
168 _eden_counters = new CSpaceCounters("eden", 0, _max_eden_size, _eden_space, | |
169 _gen_counters); | |
170 _from_counters = new CSpaceCounters("s0", 1, _max_survivor_size, _from_space, | |
171 _gen_counters); | |
172 _to_counters = new CSpaceCounters("s1", 2, _max_survivor_size, _to_space, | |
173 _gen_counters); | |
174 | |
175 compute_space_boundaries(0); | |
176 update_counters(); | |
177 _next_gen = NULL; | |
178 _tenuring_threshold = MaxTenuringThreshold; | |
179 _pretenure_size_threshold_words = PretenureSizeThreshold >> LogHeapWordSize; | |
180 } | |
181 | |
182 void DefNewGeneration::compute_space_boundaries(uintx minimum_eden_size) { | |
183 uintx alignment = GenCollectedHeap::heap()->collector_policy()->min_alignment(); | |
184 | |
185 // Compute sizes | |
186 uintx size = _virtual_space.committed_size(); | |
187 uintx survivor_size = compute_survivor_size(size, alignment); | |
188 uintx eden_size = size - (2*survivor_size); | |
189 assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); | |
190 | |
191 if (eden_size < minimum_eden_size) { | |
192 // May happen due to 64Kb rounding, if so adjust eden size back up | |
193 minimum_eden_size = align_size_up(minimum_eden_size, alignment); | |
194 uintx maximum_survivor_size = (size - minimum_eden_size) / 2; | |
195 uintx unaligned_survivor_size = | |
196 align_size_down(maximum_survivor_size, alignment); | |
197 survivor_size = MAX2(unaligned_survivor_size, alignment); | |
198 eden_size = size - (2*survivor_size); | |
199 assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); | |
200 assert(eden_size >= minimum_eden_size, "just checking"); | |
201 } | |
202 | |
203 char *eden_start = _virtual_space.low(); | |
204 char *from_start = eden_start + eden_size; | |
205 char *to_start = from_start + survivor_size; | |
206 char *to_end = to_start + survivor_size; | |
207 | |
208 assert(to_end == _virtual_space.high(), "just checking"); | |
209 assert(Space::is_aligned((HeapWord*)eden_start), "checking alignment"); | |
210 assert(Space::is_aligned((HeapWord*)from_start), "checking alignment"); | |
211 assert(Space::is_aligned((HeapWord*)to_start), "checking alignment"); | |
212 | |
213 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)from_start); | |
214 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)to_start); | |
215 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
216 | |
217 eden()->initialize(edenMR, (minimum_eden_size == 0)); | |
218 // If minumum_eden_size != 0, we will not have cleared any | |
219 // portion of eden above its top. This can cause newly | |
220 // expanded space not to be mangled if using ZapUnusedHeapArea. | |
221 // We explicitly do such mangling here. | |
222 if (ZapUnusedHeapArea && (minimum_eden_size != 0)) { | |
223 eden()->mangle_unused_area(); | |
224 } | |
225 from()->initialize(fromMR, true); | |
226 to()->initialize(toMR , true); | |
227 eden()->set_next_compaction_space(from()); | |
228 // The to-space is normally empty before a compaction so need | |
229 // not be considered. The exception is during promotion | |
230 // failure handling when to-space can contain live objects. | |
231 from()->set_next_compaction_space(NULL); | |
232 } | |
233 | |
234 void DefNewGeneration::swap_spaces() { | |
235 ContiguousSpace* s = from(); | |
236 _from_space = to(); | |
237 _to_space = s; | |
238 eden()->set_next_compaction_space(from()); | |
239 // The to-space is normally empty before a compaction so need | |
240 // not be considered. The exception is during promotion | |
241 // failure handling when to-space can contain live objects. | |
242 from()->set_next_compaction_space(NULL); | |
243 | |
244 if (UsePerfData) { | |
245 CSpaceCounters* c = _from_counters; | |
246 _from_counters = _to_counters; | |
247 _to_counters = c; | |
248 } | |
249 } | |
250 | |
251 bool DefNewGeneration::expand(size_t bytes) { | |
252 MutexLocker x(ExpandHeap_lock); | |
253 bool success = _virtual_space.expand_by(bytes); | |
254 | |
255 // Do not attempt an expand-to-the reserve size. The | |
256 // request should properly observe the maximum size of | |
257 // the generation so an expand-to-reserve should be | |
258 // unnecessary. Also a second call to expand-to-reserve | |
259 // value potentially can cause an undue expansion. | |
260 // For example if the first expand fail for unknown reasons, | |
261 // but the second succeeds and expands the heap to its maximum | |
262 // value. | |
263 if (GC_locker::is_active()) { | |
264 if (PrintGC && Verbose) { | |
265 gclog_or_tty->print_cr("Garbage collection disabled, expanded heap instead"); | |
266 } | |
267 } | |
268 | |
269 return success; | |
270 } | |
271 | |
272 | |
273 void DefNewGeneration::compute_new_size() { | |
274 // This is called after a gc that includes the following generation | |
275 // (which is required to exist.) So from-space will normally be empty. | |
276 // Note that we check both spaces, since if scavenge failed they revert roles. | |
277 // If not we bail out (otherwise we would have to relocate the objects) | |
278 if (!from()->is_empty() || !to()->is_empty()) { | |
279 return; | |
280 } | |
281 | |
282 int next_level = level() + 1; | |
283 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
284 assert(next_level < gch->_n_gens, | |
285 "DefNewGeneration cannot be an oldest gen"); | |
286 | |
287 Generation* next_gen = gch->_gens[next_level]; | |
288 size_t old_size = next_gen->capacity(); | |
289 size_t new_size_before = _virtual_space.committed_size(); | |
290 size_t min_new_size = spec()->init_size(); | |
291 size_t max_new_size = reserved().byte_size(); | |
292 assert(min_new_size <= new_size_before && | |
293 new_size_before <= max_new_size, | |
294 "just checking"); | |
295 // All space sizes must be multiples of Generation::GenGrain. | |
296 size_t alignment = Generation::GenGrain; | |
297 | |
298 // Compute desired new generation size based on NewRatio and | |
299 // NewSizeThreadIncrease | |
300 size_t desired_new_size = old_size/NewRatio; | |
301 int threads_count = Threads::number_of_non_daemon_threads(); | |
302 size_t thread_increase_size = threads_count * NewSizeThreadIncrease; | |
303 desired_new_size = align_size_up(desired_new_size + thread_increase_size, alignment); | |
304 | |
305 // Adjust new generation size | |
306 desired_new_size = MAX2(MIN2(desired_new_size, max_new_size), min_new_size); | |
307 assert(desired_new_size <= max_new_size, "just checking"); | |
308 | |
309 bool changed = false; | |
310 if (desired_new_size > new_size_before) { | |
311 size_t change = desired_new_size - new_size_before; | |
312 assert(change % alignment == 0, "just checking"); | |
313 if (expand(change)) { | |
314 changed = true; | |
315 } | |
316 // If the heap failed to expand to the desired size, | |
317 // "changed" will be false. If the expansion failed | |
318 // (and at this point it was expected to succeed), | |
319 // ignore the failure (leaving "changed" as false). | |
320 } | |
321 if (desired_new_size < new_size_before && eden()->is_empty()) { | |
322 // bail out of shrinking if objects in eden | |
323 size_t change = new_size_before - desired_new_size; | |
324 assert(change % alignment == 0, "just checking"); | |
325 _virtual_space.shrink_by(change); | |
326 changed = true; | |
327 } | |
328 if (changed) { | |
329 compute_space_boundaries(eden()->used()); | |
330 MemRegion cmr((HeapWord*)_virtual_space.low(), (HeapWord*)_virtual_space.high()); | |
331 Universe::heap()->barrier_set()->resize_covered_region(cmr); | |
332 if (Verbose && PrintGC) { | |
333 size_t new_size_after = _virtual_space.committed_size(); | |
334 size_t eden_size_after = eden()->capacity(); | |
335 size_t survivor_size_after = from()->capacity(); | |
336 gclog_or_tty->print("New generation size " SIZE_FORMAT "K->" SIZE_FORMAT "K [eden=" | |
337 SIZE_FORMAT "K,survivor=" SIZE_FORMAT "K]", | |
338 new_size_before/K, new_size_after/K, eden_size_after/K, survivor_size_after/K); | |
339 if (WizardMode) { | |
340 gclog_or_tty->print("[allowed " SIZE_FORMAT "K extra for %d threads]", | |
341 thread_increase_size/K, threads_count); | |
342 } | |
343 gclog_or_tty->cr(); | |
344 } | |
345 } | |
346 } | |
347 | |
348 void DefNewGeneration::object_iterate_since_last_GC(ObjectClosure* cl) { | |
349 // $$$ This may be wrong in case of "scavenge failure"? | |
350 eden()->object_iterate(cl); | |
351 } | |
352 | |
353 void DefNewGeneration::younger_refs_iterate(OopsInGenClosure* cl) { | |
354 assert(false, "NYI -- are you sure you want to call this?"); | |
355 } | |
356 | |
357 | |
358 size_t DefNewGeneration::capacity() const { | |
359 return eden()->capacity() | |
360 + from()->capacity(); // to() is only used during scavenge | |
361 } | |
362 | |
363 | |
364 size_t DefNewGeneration::used() const { | |
365 return eden()->used() | |
366 + from()->used(); // to() is only used during scavenge | |
367 } | |
368 | |
369 | |
370 size_t DefNewGeneration::free() const { | |
371 return eden()->free() | |
372 + from()->free(); // to() is only used during scavenge | |
373 } | |
374 | |
375 size_t DefNewGeneration::max_capacity() const { | |
376 const size_t alignment = GenCollectedHeap::heap()->collector_policy()->min_alignment(); | |
377 const size_t reserved_bytes = reserved().byte_size(); | |
378 return reserved_bytes - compute_survivor_size(reserved_bytes, alignment); | |
379 } | |
380 | |
381 size_t DefNewGeneration::unsafe_max_alloc_nogc() const { | |
382 return eden()->free(); | |
383 } | |
384 | |
385 size_t DefNewGeneration::capacity_before_gc() const { | |
386 return eden()->capacity(); | |
387 } | |
388 | |
389 size_t DefNewGeneration::contiguous_available() const { | |
390 return eden()->free(); | |
391 } | |
392 | |
393 | |
394 HeapWord** DefNewGeneration::top_addr() const { return eden()->top_addr(); } | |
395 HeapWord** DefNewGeneration::end_addr() const { return eden()->end_addr(); } | |
396 | |
397 void DefNewGeneration::object_iterate(ObjectClosure* blk) { | |
398 eden()->object_iterate(blk); | |
399 from()->object_iterate(blk); | |
400 } | |
401 | |
402 | |
403 void DefNewGeneration::space_iterate(SpaceClosure* blk, | |
404 bool usedOnly) { | |
405 blk->do_space(eden()); | |
406 blk->do_space(from()); | |
407 blk->do_space(to()); | |
408 } | |
409 | |
410 // The last collection bailed out, we are running out of heap space, | |
411 // so we try to allocate the from-space, too. | |
412 HeapWord* DefNewGeneration::allocate_from_space(size_t size) { | |
413 HeapWord* result = NULL; | |
414 if (PrintGC && Verbose) { | |
415 gclog_or_tty->print("DefNewGeneration::allocate_from_space(%u):" | |
416 " will_fail: %s" | |
417 " heap_lock: %s" | |
418 " free: " SIZE_FORMAT, | |
419 size, | |
420 GenCollectedHeap::heap()->incremental_collection_will_fail() ? "true" : "false", | |
421 Heap_lock->is_locked() ? "locked" : "unlocked", | |
422 from()->free()); | |
423 } | |
424 if (should_allocate_from_space() || GC_locker::is_active_and_needs_gc()) { | |
425 if (Heap_lock->owned_by_self() || | |
426 (SafepointSynchronize::is_at_safepoint() && | |
427 Thread::current()->is_VM_thread())) { | |
428 // If the Heap_lock is not locked by this thread, this will be called | |
429 // again later with the Heap_lock held. | |
430 result = from()->allocate(size); | |
431 } else if (PrintGC && Verbose) { | |
432 gclog_or_tty->print_cr(" Heap_lock is not owned by self"); | |
433 } | |
434 } else if (PrintGC && Verbose) { | |
435 gclog_or_tty->print_cr(" should_allocate_from_space: NOT"); | |
436 } | |
437 if (PrintGC && Verbose) { | |
438 gclog_or_tty->print_cr(" returns %s", result == NULL ? "NULL" : "object"); | |
439 } | |
440 return result; | |
441 } | |
442 | |
443 HeapWord* DefNewGeneration::expand_and_allocate(size_t size, | |
444 bool is_tlab, | |
445 bool parallel) { | |
446 // We don't attempt to expand the young generation (but perhaps we should.) | |
447 return allocate(size, is_tlab); | |
448 } | |
449 | |
450 | |
451 void DefNewGeneration::collect(bool full, | |
452 bool clear_all_soft_refs, | |
453 size_t size, | |
454 bool is_tlab) { | |
455 assert(full || size > 0, "otherwise we don't want to collect"); | |
456 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
457 _next_gen = gch->next_gen(this); | |
458 assert(_next_gen != NULL, | |
459 "This must be the youngest gen, and not the only gen"); | |
460 | |
461 // If the next generation is too full to accomodate promotion | |
462 // from this generation, pass on collection; let the next generation | |
463 // do it. | |
464 if (!collection_attempt_is_safe()) { | |
465 gch->set_incremental_collection_will_fail(); | |
466 return; | |
467 } | |
468 assert(to()->is_empty(), "Else not collection_attempt_is_safe"); | |
469 | |
470 init_assuming_no_promotion_failure(); | |
471 | |
472 TraceTime t1("GC", PrintGC && !PrintGCDetails, true, gclog_or_tty); | |
473 // Capture heap used before collection (for printing). | |
474 size_t gch_prev_used = gch->used(); | |
475 | |
476 SpecializationStats::clear(); | |
477 | |
478 // These can be shared for all code paths | |
479 IsAliveClosure is_alive(this); | |
480 ScanWeakRefClosure scan_weak_ref(this); | |
481 | |
482 age_table()->clear(); | |
483 to()->clear(); | |
484 | |
485 gch->rem_set()->prepare_for_younger_refs_iterate(false); | |
486 | |
487 assert(gch->no_allocs_since_save_marks(0), | |
488 "save marks have not been newly set."); | |
489 | |
490 // Weak refs. | |
491 // FIXME: Are these storage leaks, or are they resource objects? | |
492 #ifdef COMPILER2 | |
493 ReferencePolicy *soft_ref_policy = new LRUMaxHeapPolicy(); | |
494 #else | |
495 ReferencePolicy *soft_ref_policy = new LRUCurrentHeapPolicy(); | |
496 #endif // COMPILER2 | |
497 | |
498 // Not very pretty. | |
499 CollectorPolicy* cp = gch->collector_policy(); | |
500 | |
501 FastScanClosure fsc_with_no_gc_barrier(this, false); | |
502 FastScanClosure fsc_with_gc_barrier(this, true); | |
503 | |
504 set_promo_failure_scan_stack_closure(&fsc_with_no_gc_barrier); | |
505 FastEvacuateFollowersClosure evacuate_followers(gch, _level, this, | |
506 &fsc_with_no_gc_barrier, | |
507 &fsc_with_gc_barrier); | |
508 | |
509 assert(gch->no_allocs_since_save_marks(0), | |
510 "save marks have not been newly set."); | |
511 | |
512 gch->gen_process_strong_roots(_level, | |
513 true, // Process younger gens, if any, as | |
514 // strong roots. | |
515 false,// not collecting permanent generation. | |
516 SharedHeap::SO_AllClasses, | |
517 &fsc_with_gc_barrier, | |
518 &fsc_with_no_gc_barrier); | |
519 | |
520 // "evacuate followers". | |
521 evacuate_followers.do_void(); | |
522 | |
523 FastKeepAliveClosure keep_alive(this, &scan_weak_ref); | |
524 ref_processor()->process_discovered_references( | |
525 soft_ref_policy, &is_alive, &keep_alive, &evacuate_followers, NULL); | |
526 if (!promotion_failed()) { | |
527 // Swap the survivor spaces. | |
528 eden()->clear(); | |
529 from()->clear(); | |
530 swap_spaces(); | |
531 | |
532 assert(to()->is_empty(), "to space should be empty now"); | |
533 | |
534 // Set the desired survivor size to half the real survivor space | |
535 _tenuring_threshold = | |
536 age_table()->compute_tenuring_threshold(to()->capacity()/HeapWordSize); | |
537 | |
538 if (PrintGC && !PrintGCDetails) { | |
539 gch->print_heap_change(gch_prev_used); | |
540 } | |
541 } else { | |
542 assert(HandlePromotionFailure, | |
543 "Should not be here unless promotion failure handling is on"); | |
544 assert(_promo_failure_scan_stack != NULL && | |
545 _promo_failure_scan_stack->length() == 0, "post condition"); | |
546 | |
547 // deallocate stack and it's elements | |
548 delete _promo_failure_scan_stack; | |
549 _promo_failure_scan_stack = NULL; | |
550 | |
551 remove_forwarding_pointers(); | |
552 if (PrintGCDetails) { | |
553 gclog_or_tty->print(" (promotion failed)"); | |
554 } | |
555 // Add to-space to the list of space to compact | |
556 // when a promotion failure has occurred. In that | |
557 // case there can be live objects in to-space | |
558 // as a result of a partial evacuation of eden | |
559 // and from-space. | |
560 swap_spaces(); // For the sake of uniformity wrt ParNewGeneration::collect(). | |
561 from()->set_next_compaction_space(to()); | |
562 gch->set_incremental_collection_will_fail(); | |
563 | |
564 // Reset the PromotionFailureALot counters. | |
565 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
566 } | |
567 // set new iteration safe limit for the survivor spaces | |
568 from()->set_concurrent_iteration_safe_limit(from()->top()); | |
569 to()->set_concurrent_iteration_safe_limit(to()->top()); | |
570 SpecializationStats::print(); | |
571 update_time_of_last_gc(os::javaTimeMillis()); | |
572 } | |
573 | |
574 class RemoveForwardPointerClosure: public ObjectClosure { | |
575 public: | |
576 void do_object(oop obj) { | |
577 obj->init_mark(); | |
578 } | |
579 }; | |
580 | |
581 void DefNewGeneration::init_assuming_no_promotion_failure() { | |
582 _promotion_failed = false; | |
583 from()->set_next_compaction_space(NULL); | |
584 } | |
585 | |
586 void DefNewGeneration::remove_forwarding_pointers() { | |
587 RemoveForwardPointerClosure rspc; | |
588 eden()->object_iterate(&rspc); | |
589 from()->object_iterate(&rspc); | |
590 // Now restore saved marks, if any. | |
591 if (_objs_with_preserved_marks != NULL) { | |
592 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
593 assert(_objs_with_preserved_marks->length() == | |
594 _preserved_marks_of_objs->length(), "Both or none."); | |
595 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
596 oop obj = _objs_with_preserved_marks->at(i); | |
597 markOop m = _preserved_marks_of_objs->at(i); | |
598 obj->set_mark(m); | |
599 } | |
600 delete _objs_with_preserved_marks; | |
601 delete _preserved_marks_of_objs; | |
602 _objs_with_preserved_marks = NULL; | |
603 _preserved_marks_of_objs = NULL; | |
604 } | |
605 } | |
606 | |
607 void DefNewGeneration::preserve_mark_if_necessary(oop obj, markOop m) { | |
608 if (m->must_be_preserved_for_promotion_failure(obj)) { | |
609 if (_objs_with_preserved_marks == NULL) { | |
610 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
611 _objs_with_preserved_marks = new (ResourceObj::C_HEAP) | |
612 GrowableArray<oop>(PreserveMarkStackSize, true); | |
613 _preserved_marks_of_objs = new (ResourceObj::C_HEAP) | |
614 GrowableArray<markOop>(PreserveMarkStackSize, true); | |
615 } | |
616 _objs_with_preserved_marks->push(obj); | |
617 _preserved_marks_of_objs->push(m); | |
618 } | |
619 } | |
620 | |
621 void DefNewGeneration::handle_promotion_failure(oop old) { | |
622 preserve_mark_if_necessary(old, old->mark()); | |
623 // forward to self | |
624 old->forward_to(old); | |
625 _promotion_failed = true; | |
626 | |
627 push_on_promo_failure_scan_stack(old); | |
628 | |
629 if (!_promo_failure_drain_in_progress) { | |
630 // prevent recursion in copy_to_survivor_space() | |
631 _promo_failure_drain_in_progress = true; | |
632 drain_promo_failure_scan_stack(); | |
633 _promo_failure_drain_in_progress = false; | |
634 } | |
635 } | |
636 | |
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637 oop DefNewGeneration::copy_to_survivor_space(oop old) { |
0 | 638 assert(is_in_reserved(old) && !old->is_forwarded(), |
639 "shouldn't be scavenging this oop"); | |
640 size_t s = old->size(); | |
641 oop obj = NULL; | |
642 | |
643 // Try allocating obj in to-space (unless too old) | |
644 if (old->age() < tenuring_threshold()) { | |
645 obj = (oop) to()->allocate(s); | |
646 } | |
647 | |
648 // Otherwise try allocating obj tenured | |
649 if (obj == NULL) { | |
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650 obj = _next_gen->promote(old, s); |
0 | 651 if (obj == NULL) { |
652 if (!HandlePromotionFailure) { | |
653 // A failed promotion likely means the MaxLiveObjectEvacuationRatio flag | |
654 // is incorrectly set. In any case, its seriously wrong to be here! | |
655 vm_exit_out_of_memory(s*wordSize, "promotion"); | |
656 } | |
657 | |
658 handle_promotion_failure(old); | |
659 return old; | |
660 } | |
661 } else { | |
662 // Prefetch beyond obj | |
663 const intx interval = PrefetchCopyIntervalInBytes; | |
664 Prefetch::write(obj, interval); | |
665 | |
666 // Copy obj | |
667 Copy::aligned_disjoint_words((HeapWord*)old, (HeapWord*)obj, s); | |
668 | |
669 // Increment age if obj still in new generation | |
670 obj->incr_age(); | |
671 age_table()->add(obj, s); | |
672 } | |
673 | |
674 // Done, insert forward pointer to obj in this header | |
675 old->forward_to(obj); | |
676 | |
677 return obj; | |
678 } | |
679 | |
680 void DefNewGeneration::push_on_promo_failure_scan_stack(oop obj) { | |
681 if (_promo_failure_scan_stack == NULL) { | |
682 _promo_failure_scan_stack = new (ResourceObj::C_HEAP) | |
683 GrowableArray<oop>(40, true); | |
684 } | |
685 | |
686 _promo_failure_scan_stack->push(obj); | |
687 } | |
688 | |
689 void DefNewGeneration::drain_promo_failure_scan_stack() { | |
690 assert(_promo_failure_scan_stack != NULL, "precondition"); | |
691 | |
692 while (_promo_failure_scan_stack->length() > 0) { | |
693 oop obj = _promo_failure_scan_stack->pop(); | |
694 obj->oop_iterate(_promo_failure_scan_stack_closure); | |
695 } | |
696 } | |
697 | |
698 void DefNewGeneration::save_marks() { | |
699 eden()->set_saved_mark(); | |
700 to()->set_saved_mark(); | |
701 from()->set_saved_mark(); | |
702 } | |
703 | |
704 | |
705 void DefNewGeneration::reset_saved_marks() { | |
706 eden()->reset_saved_mark(); | |
707 to()->reset_saved_mark(); | |
708 from()->reset_saved_mark(); | |
709 } | |
710 | |
711 | |
712 bool DefNewGeneration::no_allocs_since_save_marks() { | |
713 assert(eden()->saved_mark_at_top(), "Violated spec - alloc in eden"); | |
714 assert(from()->saved_mark_at_top(), "Violated spec - alloc in from"); | |
715 return to()->saved_mark_at_top(); | |
716 } | |
717 | |
718 #define DefNew_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
719 \ | |
720 void DefNewGeneration:: \ | |
721 oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
722 cl->set_generation(this); \ | |
723 eden()->oop_since_save_marks_iterate##nv_suffix(cl); \ | |
724 to()->oop_since_save_marks_iterate##nv_suffix(cl); \ | |
725 from()->oop_since_save_marks_iterate##nv_suffix(cl); \ | |
726 cl->reset_generation(); \ | |
727 save_marks(); \ | |
728 } | |
729 | |
730 ALL_SINCE_SAVE_MARKS_CLOSURES(DefNew_SINCE_SAVE_MARKS_DEFN) | |
731 | |
732 #undef DefNew_SINCE_SAVE_MARKS_DEFN | |
733 | |
734 void DefNewGeneration::contribute_scratch(ScratchBlock*& list, Generation* requestor, | |
735 size_t max_alloc_words) { | |
736 if (requestor == this || _promotion_failed) return; | |
737 assert(requestor->level() > level(), "DefNewGeneration must be youngest"); | |
738 | |
739 /* $$$ Assert this? "trace" is a "MarkSweep" function so that's not appropriate. | |
740 if (to_space->top() > to_space->bottom()) { | |
741 trace("to_space not empty when contribute_scratch called"); | |
742 } | |
743 */ | |
744 | |
745 ContiguousSpace* to_space = to(); | |
746 assert(to_space->end() >= to_space->top(), "pointers out of order"); | |
747 size_t free_words = pointer_delta(to_space->end(), to_space->top()); | |
748 if (free_words >= MinFreeScratchWords) { | |
749 ScratchBlock* sb = (ScratchBlock*)to_space->top(); | |
750 sb->num_words = free_words; | |
751 sb->next = list; | |
752 list = sb; | |
753 } | |
754 } | |
755 | |
756 bool DefNewGeneration::collection_attempt_is_safe() { | |
757 if (!to()->is_empty()) { | |
758 return false; | |
759 } | |
760 if (_next_gen == NULL) { | |
761 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
762 _next_gen = gch->next_gen(this); | |
763 assert(_next_gen != NULL, | |
764 "This must be the youngest gen, and not the only gen"); | |
765 } | |
766 | |
767 // Decide if there's enough room for a full promotion | |
768 // When using extremely large edens, we effectively lose a | |
769 // large amount of old space. Use the "MaxLiveObjectEvacuationRatio" | |
770 // flag to reduce the minimum evacuation space requirements. If | |
771 // there is not enough space to evacuate eden during a scavenge, | |
772 // the VM will immediately exit with an out of memory error. | |
773 // This flag has not been tested | |
774 // with collectors other than simple mark & sweep. | |
775 // | |
776 // Note that with the addition of promotion failure handling, the | |
777 // VM will not immediately exit but will undo the young generation | |
778 // collection. The parameter is left here for compatibility. | |
779 const double evacuation_ratio = MaxLiveObjectEvacuationRatio / 100.0; | |
780 | |
781 // worst_case_evacuation is based on "used()". For the case where this | |
782 // method is called after a collection, this is still appropriate because | |
783 // the case that needs to be detected is one in which a full collection | |
784 // has been done and has overflowed into the young generation. In that | |
785 // case a minor collection will fail (the overflow of the full collection | |
786 // means there is no space in the old generation for any promotion). | |
787 size_t worst_case_evacuation = (size_t)(used() * evacuation_ratio); | |
788 | |
789 return _next_gen->promotion_attempt_is_safe(worst_case_evacuation, | |
790 HandlePromotionFailure); | |
791 } | |
792 | |
793 void DefNewGeneration::gc_epilogue(bool full) { | |
794 // Check if the heap is approaching full after a collection has | |
795 // been done. Generally the young generation is empty at | |
796 // a minimum at the end of a collection. If it is not, then | |
797 // the heap is approaching full. | |
798 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
799 clear_should_allocate_from_space(); | |
800 if (collection_attempt_is_safe()) { | |
801 gch->clear_incremental_collection_will_fail(); | |
802 } else { | |
803 gch->set_incremental_collection_will_fail(); | |
804 if (full) { // we seem to be running out of space | |
805 set_should_allocate_from_space(); | |
806 } | |
807 } | |
808 | |
809 // update the generation and space performance counters | |
810 update_counters(); | |
811 gch->collector_policy()->counters()->update_counters(); | |
812 } | |
813 | |
814 void DefNewGeneration::update_counters() { | |
815 if (UsePerfData) { | |
816 _eden_counters->update_all(); | |
817 _from_counters->update_all(); | |
818 _to_counters->update_all(); | |
819 _gen_counters->update_all(); | |
820 } | |
821 } | |
822 | |
823 void DefNewGeneration::verify(bool allow_dirty) { | |
824 eden()->verify(allow_dirty); | |
825 from()->verify(allow_dirty); | |
826 to()->verify(allow_dirty); | |
827 } | |
828 | |
829 void DefNewGeneration::print_on(outputStream* st) const { | |
830 Generation::print_on(st); | |
831 st->print(" eden"); | |
832 eden()->print_on(st); | |
833 st->print(" from"); | |
834 from()->print_on(st); | |
835 st->print(" to "); | |
836 to()->print_on(st); | |
837 } | |
838 | |
839 | |
840 const char* DefNewGeneration::name() const { | |
841 return "def new generation"; | |
842 } | |
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843 |
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844 // Moved from inline file as they are not called inline |
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845 CompactibleSpace* DefNewGeneration::first_compaction_space() const { |
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846 return eden(); |
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847 } |
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848 |
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849 HeapWord* DefNewGeneration::allocate(size_t word_size, |
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850 bool is_tlab) { |
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851 // This is the slow-path allocation for the DefNewGeneration. |
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852 // Most allocations are fast-path in compiled code. |
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853 // We try to allocate from the eden. If that works, we are happy. |
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854 // Note that since DefNewGeneration supports lock-free allocation, we |
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855 // have to use it here, as well. |
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856 HeapWord* result = eden()->par_allocate(word_size); |
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857 if (result != NULL) { |
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858 return result; |
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859 } |
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860 do { |
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861 HeapWord* old_limit = eden()->soft_end(); |
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862 if (old_limit < eden()->end()) { |
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863 // Tell the next generation we reached a limit. |
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864 HeapWord* new_limit = |
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865 next_gen()->allocation_limit_reached(eden(), eden()->top(), word_size); |
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866 if (new_limit != NULL) { |
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867 Atomic::cmpxchg_ptr(new_limit, eden()->soft_end_addr(), old_limit); |
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868 } else { |
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869 assert(eden()->soft_end() == eden()->end(), |
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870 "invalid state after allocation_limit_reached returned null"); |
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871 } |
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872 } else { |
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873 // The allocation failed and the soft limit is equal to the hard limit, |
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874 // there are no reasons to do an attempt to allocate |
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875 assert(old_limit == eden()->end(), "sanity check"); |
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876 break; |
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877 } |
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878 // Try to allocate until succeeded or the soft limit can't be adjusted |
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879 result = eden()->par_allocate(word_size); |
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880 } while (result == NULL); |
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881 |
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882 // If the eden is full and the last collection bailed out, we are running |
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883 // out of heap space, and we try to allocate the from-space, too. |
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884 // allocate_from_space can't be inlined because that would introduce a |
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885 // circular dependency at compile time. |
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886 if (result == NULL) { |
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887 result = allocate_from_space(word_size); |
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888 } |
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889 return result; |
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890 } |
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891 |
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892 HeapWord* DefNewGeneration::par_allocate(size_t word_size, |
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893 bool is_tlab) { |
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894 return eden()->par_allocate(word_size); |
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895 } |
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896 |
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897 void DefNewGeneration::gc_prologue(bool full) { |
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898 // Ensure that _end and _soft_end are the same in eden space. |
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899 eden()->set_soft_end(eden()->end()); |
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900 } |
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901 |
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902 size_t DefNewGeneration::tlab_capacity() const { |
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903 return eden()->capacity(); |
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904 } |
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905 |
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906 size_t DefNewGeneration::unsafe_max_tlab_alloc() const { |
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907 return unsafe_max_alloc_nogc(); |
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908 } |