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annotate src/share/vm/memory/defNewGeneration.cpp @ 14521:29ccc4cbabca
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author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Wed, 12 Mar 2014 13:30:08 +0100 |
parents | d166675568f6 |
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0 | 1 /* |
10405 | 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/shared/collectorCounters.hpp" | |
27 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
10405 | 28 #include "gc_implementation/shared/gcHeapSummary.hpp" |
29 #include "gc_implementation/shared/gcTimer.hpp" | |
30 #include "gc_implementation/shared/gcTraceTime.hpp" | |
31 #include "gc_implementation/shared/gcTrace.hpp" | |
1972 | 32 #include "gc_implementation/shared/spaceDecorator.hpp" |
33 #include "memory/defNewGeneration.inline.hpp" | |
34 #include "memory/gcLocker.inline.hpp" | |
35 #include "memory/genCollectedHeap.hpp" | |
36 #include "memory/genOopClosures.inline.hpp" | |
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37 #include "memory/genRemSet.hpp" |
1972 | 38 #include "memory/generationSpec.hpp" |
39 #include "memory/iterator.hpp" | |
40 #include "memory/referencePolicy.hpp" | |
41 #include "memory/space.inline.hpp" | |
42 #include "oops/instanceRefKlass.hpp" | |
43 #include "oops/oop.inline.hpp" | |
44 #include "runtime/java.hpp" | |
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45 #include "runtime/thread.inline.hpp" |
1972 | 46 #include "utilities/copy.hpp" |
47 #include "utilities/stack.inline.hpp" | |
0 | 48 |
49 // | |
50 // DefNewGeneration functions. | |
51 | |
52 // Methods of protected closure types. | |
53 | |
54 DefNewGeneration::IsAliveClosure::IsAliveClosure(Generation* g) : _g(g) { | |
55 assert(g->level() == 0, "Optimized for youngest gen."); | |
56 } | |
57 bool DefNewGeneration::IsAliveClosure::do_object_b(oop p) { | |
58 return (HeapWord*)p >= _g->reserved().end() || p->is_forwarded(); | |
59 } | |
60 | |
61 DefNewGeneration::KeepAliveClosure:: | |
62 KeepAliveClosure(ScanWeakRefClosure* cl) : _cl(cl) { | |
63 GenRemSet* rs = GenCollectedHeap::heap()->rem_set(); | |
64 _rs = (CardTableRS*)rs; | |
65 } | |
66 | |
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67 void DefNewGeneration::KeepAliveClosure::do_oop(oop* p) { DefNewGeneration::KeepAliveClosure::do_oop_work(p); } |
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68 void DefNewGeneration::KeepAliveClosure::do_oop(narrowOop* p) { DefNewGeneration::KeepAliveClosure::do_oop_work(p); } |
0 | 69 |
70 | |
71 DefNewGeneration::FastKeepAliveClosure:: | |
72 FastKeepAliveClosure(DefNewGeneration* g, ScanWeakRefClosure* cl) : | |
73 DefNewGeneration::KeepAliveClosure(cl) { | |
74 _boundary = g->reserved().end(); | |
75 } | |
76 | |
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77 void DefNewGeneration::FastKeepAliveClosure::do_oop(oop* p) { DefNewGeneration::FastKeepAliveClosure::do_oop_work(p); } |
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78 void DefNewGeneration::FastKeepAliveClosure::do_oop(narrowOop* p) { DefNewGeneration::FastKeepAliveClosure::do_oop_work(p); } |
0 | 79 |
80 DefNewGeneration::EvacuateFollowersClosure:: | |
81 EvacuateFollowersClosure(GenCollectedHeap* gch, int level, | |
82 ScanClosure* cur, ScanClosure* older) : | |
83 _gch(gch), _level(level), | |
84 _scan_cur_or_nonheap(cur), _scan_older(older) | |
85 {} | |
86 | |
87 void DefNewGeneration::EvacuateFollowersClosure::do_void() { | |
88 do { | |
89 _gch->oop_since_save_marks_iterate(_level, _scan_cur_or_nonheap, | |
90 _scan_older); | |
91 } while (!_gch->no_allocs_since_save_marks(_level)); | |
92 } | |
93 | |
94 DefNewGeneration::FastEvacuateFollowersClosure:: | |
95 FastEvacuateFollowersClosure(GenCollectedHeap* gch, int level, | |
96 DefNewGeneration* gen, | |
97 FastScanClosure* cur, FastScanClosure* older) : | |
98 _gch(gch), _level(level), _gen(gen), | |
99 _scan_cur_or_nonheap(cur), _scan_older(older) | |
100 {} | |
101 | |
102 void DefNewGeneration::FastEvacuateFollowersClosure::do_void() { | |
103 do { | |
104 _gch->oop_since_save_marks_iterate(_level, _scan_cur_or_nonheap, | |
105 _scan_older); | |
106 } while (!_gch->no_allocs_since_save_marks(_level)); | |
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107 guarantee(_gen->promo_failure_scan_is_complete(), "Failed to finish scan"); |
0 | 108 } |
109 | |
110 ScanClosure::ScanClosure(DefNewGeneration* g, bool gc_barrier) : | |
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111 OopsInKlassOrGenClosure(g), _g(g), _gc_barrier(gc_barrier) |
0 | 112 { |
113 assert(_g->level() == 0, "Optimized for youngest generation"); | |
114 _boundary = _g->reserved().end(); | |
115 } | |
116 | |
113
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117 void ScanClosure::do_oop(oop* p) { ScanClosure::do_oop_work(p); } |
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118 void ScanClosure::do_oop(narrowOop* p) { ScanClosure::do_oop_work(p); } |
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119 |
0 | 120 FastScanClosure::FastScanClosure(DefNewGeneration* g, bool gc_barrier) : |
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121 OopsInKlassOrGenClosure(g), _g(g), _gc_barrier(gc_barrier) |
0 | 122 { |
123 assert(_g->level() == 0, "Optimized for youngest generation"); | |
124 _boundary = _g->reserved().end(); | |
125 } | |
126 | |
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127 void FastScanClosure::do_oop(oop* p) { FastScanClosure::do_oop_work(p); } |
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128 void FastScanClosure::do_oop(narrowOop* p) { FastScanClosure::do_oop_work(p); } |
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129 |
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130 void KlassScanClosure::do_klass(Klass* klass) { |
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131 #ifndef PRODUCT |
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132 if (TraceScavenge) { |
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133 ResourceMark rm; |
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134 gclog_or_tty->print_cr("KlassScanClosure::do_klass %p, %s, dirty: %s", |
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135 klass, |
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136 klass->external_name(), |
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137 klass->has_modified_oops() ? "true" : "false"); |
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138 } |
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139 #endif |
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140 |
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141 // If the klass has not been dirtied we know that there's |
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142 // no references into the young gen and we can skip it. |
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143 if (klass->has_modified_oops()) { |
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144 if (_accumulate_modified_oops) { |
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145 klass->accumulate_modified_oops(); |
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146 } |
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147 |
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148 // Clear this state since we're going to scavenge all the metadata. |
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149 klass->clear_modified_oops(); |
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150 |
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151 // Tell the closure which Klass is being scanned so that it can be dirtied |
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152 // if oops are left pointing into the young gen. |
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153 _scavenge_closure->set_scanned_klass(klass); |
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154 |
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155 klass->oops_do(_scavenge_closure); |
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156 |
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157 _scavenge_closure->set_scanned_klass(NULL); |
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158 } |
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159 } |
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160 |
0 | 161 ScanWeakRefClosure::ScanWeakRefClosure(DefNewGeneration* g) : |
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162 _g(g) |
0 | 163 { |
164 assert(_g->level() == 0, "Optimized for youngest generation"); | |
165 _boundary = _g->reserved().end(); | |
166 } | |
167 | |
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168 void ScanWeakRefClosure::do_oop(oop* p) { ScanWeakRefClosure::do_oop_work(p); } |
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169 void ScanWeakRefClosure::do_oop(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); } |
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170 |
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171 void FilteringClosure::do_oop(oop* p) { FilteringClosure::do_oop_work(p); } |
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172 void FilteringClosure::do_oop(narrowOop* p) { FilteringClosure::do_oop_work(p); } |
0 | 173 |
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174 KlassScanClosure::KlassScanClosure(OopsInKlassOrGenClosure* scavenge_closure, |
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175 KlassRemSet* klass_rem_set) |
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176 : _scavenge_closure(scavenge_closure), |
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177 _accumulate_modified_oops(klass_rem_set->accumulate_modified_oops()) {} |
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178 |
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179 |
0 | 180 DefNewGeneration::DefNewGeneration(ReservedSpace rs, |
181 size_t initial_size, | |
182 int level, | |
183 const char* policy) | |
184 : Generation(rs, initial_size, level), | |
185 _promo_failure_drain_in_progress(false), | |
186 _should_allocate_from_space(false) | |
187 { | |
188 MemRegion cmr((HeapWord*)_virtual_space.low(), | |
189 (HeapWord*)_virtual_space.high()); | |
190 Universe::heap()->barrier_set()->resize_covered_region(cmr); | |
191 | |
192 if (GenCollectedHeap::heap()->collector_policy()->has_soft_ended_eden()) { | |
193 _eden_space = new ConcEdenSpace(this); | |
194 } else { | |
195 _eden_space = new EdenSpace(this); | |
196 } | |
197 _from_space = new ContiguousSpace(); | |
198 _to_space = new ContiguousSpace(); | |
199 | |
200 if (_eden_space == NULL || _from_space == NULL || _to_space == NULL) | |
201 vm_exit_during_initialization("Could not allocate a new gen space"); | |
202 | |
203 // Compute the maximum eden and survivor space sizes. These sizes | |
204 // are computed assuming the entire reserved space is committed. | |
205 // These values are exported as performance counters. | |
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206 uintx alignment = GenCollectedHeap::heap()->collector_policy()->space_alignment(); |
0 | 207 uintx size = _virtual_space.reserved_size(); |
208 _max_survivor_size = compute_survivor_size(size, alignment); | |
209 _max_eden_size = size - (2*_max_survivor_size); | |
210 | |
211 // allocate the performance counters | |
212 | |
213 // Generation counters -- generation 0, 3 subspaces | |
214 _gen_counters = new GenerationCounters("new", 0, 3, &_virtual_space); | |
215 _gc_counters = new CollectorCounters(policy, 0); | |
216 | |
217 _eden_counters = new CSpaceCounters("eden", 0, _max_eden_size, _eden_space, | |
218 _gen_counters); | |
219 _from_counters = new CSpaceCounters("s0", 1, _max_survivor_size, _from_space, | |
220 _gen_counters); | |
221 _to_counters = new CSpaceCounters("s1", 2, _max_survivor_size, _to_space, | |
222 _gen_counters); | |
223 | |
263
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224 compute_space_boundaries(0, SpaceDecorator::Clear, SpaceDecorator::Mangle); |
0 | 225 update_counters(); |
226 _next_gen = NULL; | |
227 _tenuring_threshold = MaxTenuringThreshold; | |
228 _pretenure_size_threshold_words = PretenureSizeThreshold >> LogHeapWordSize; | |
10405 | 229 |
230 _gc_timer = new (ResourceObj::C_HEAP, mtGC) STWGCTimer(); | |
0 | 231 } |
232 | |
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233 void DefNewGeneration::compute_space_boundaries(uintx minimum_eden_size, |
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234 bool clear_space, |
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235 bool mangle_space) { |
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236 uintx alignment = |
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237 GenCollectedHeap::heap()->collector_policy()->space_alignment(); |
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238 |
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239 // If the spaces are being cleared (only done at heap initialization |
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240 // currently), the survivor spaces need not be empty. |
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241 // Otherwise, no care is taken for used areas in the survivor spaces |
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242 // so check. |
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243 assert(clear_space || (to()->is_empty() && from()->is_empty()), |
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244 "Initialization of the survivor spaces assumes these are empty"); |
0 | 245 |
246 // Compute sizes | |
247 uintx size = _virtual_space.committed_size(); | |
248 uintx survivor_size = compute_survivor_size(size, alignment); | |
249 uintx eden_size = size - (2*survivor_size); | |
250 assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); | |
251 | |
252 if (eden_size < minimum_eden_size) { | |
253 // May happen due to 64Kb rounding, if so adjust eden size back up | |
254 minimum_eden_size = align_size_up(minimum_eden_size, alignment); | |
255 uintx maximum_survivor_size = (size - minimum_eden_size) / 2; | |
256 uintx unaligned_survivor_size = | |
257 align_size_down(maximum_survivor_size, alignment); | |
258 survivor_size = MAX2(unaligned_survivor_size, alignment); | |
259 eden_size = size - (2*survivor_size); | |
260 assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); | |
261 assert(eden_size >= minimum_eden_size, "just checking"); | |
262 } | |
263 | |
264 char *eden_start = _virtual_space.low(); | |
265 char *from_start = eden_start + eden_size; | |
266 char *to_start = from_start + survivor_size; | |
267 char *to_end = to_start + survivor_size; | |
268 | |
269 assert(to_end == _virtual_space.high(), "just checking"); | |
270 assert(Space::is_aligned((HeapWord*)eden_start), "checking alignment"); | |
271 assert(Space::is_aligned((HeapWord*)from_start), "checking alignment"); | |
272 assert(Space::is_aligned((HeapWord*)to_start), "checking alignment"); | |
273 | |
274 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)from_start); | |
275 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)to_start); | |
276 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
277 | |
263
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278 // A minimum eden size implies that there is a part of eden that |
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279 // is being used and that affects the initialization of any |
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280 // newly formed eden. |
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281 bool live_in_eden = minimum_eden_size > 0; |
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282 |
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283 // If not clearing the spaces, do some checking to verify that |
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284 // the space are already mangled. |
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285 if (!clear_space) { |
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286 // Must check mangling before the spaces are reshaped. Otherwise, |
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287 // the bottom or end of one space may have moved into another |
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288 // a failure of the check may not correctly indicate which space |
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289 // is not properly mangled. |
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290 if (ZapUnusedHeapArea) { |
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291 HeapWord* limit = (HeapWord*) _virtual_space.high(); |
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292 eden()->check_mangled_unused_area(limit); |
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293 from()->check_mangled_unused_area(limit); |
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294 to()->check_mangled_unused_area(limit); |
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295 } |
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296 } |
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297 |
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298 // Reset the spaces for their new regions. |
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299 eden()->initialize(edenMR, |
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300 clear_space && !live_in_eden, |
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301 SpaceDecorator::Mangle); |
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302 // If clear_space and live_in_eden, we will not have cleared any |
0 | 303 // portion of eden above its top. This can cause newly |
304 // expanded space not to be mangled if using ZapUnusedHeapArea. | |
305 // We explicitly do such mangling here. | |
263
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306 if (ZapUnusedHeapArea && clear_space && live_in_eden && mangle_space) { |
0 | 307 eden()->mangle_unused_area(); |
308 } | |
263
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309 from()->initialize(fromMR, clear_space, mangle_space); |
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310 to()->initialize(toMR, clear_space, mangle_space); |
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311 |
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312 // Set next compaction spaces. |
0 | 313 eden()->set_next_compaction_space(from()); |
314 // The to-space is normally empty before a compaction so need | |
315 // not be considered. The exception is during promotion | |
316 // failure handling when to-space can contain live objects. | |
317 from()->set_next_compaction_space(NULL); | |
318 } | |
319 | |
320 void DefNewGeneration::swap_spaces() { | |
321 ContiguousSpace* s = from(); | |
322 _from_space = to(); | |
323 _to_space = s; | |
324 eden()->set_next_compaction_space(from()); | |
325 // The to-space is normally empty before a compaction so need | |
326 // not be considered. The exception is during promotion | |
327 // failure handling when to-space can contain live objects. | |
328 from()->set_next_compaction_space(NULL); | |
329 | |
330 if (UsePerfData) { | |
331 CSpaceCounters* c = _from_counters; | |
332 _from_counters = _to_counters; | |
333 _to_counters = c; | |
334 } | |
335 } | |
336 | |
337 bool DefNewGeneration::expand(size_t bytes) { | |
338 MutexLocker x(ExpandHeap_lock); | |
263
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339 HeapWord* prev_high = (HeapWord*) _virtual_space.high(); |
0 | 340 bool success = _virtual_space.expand_by(bytes); |
263
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341 if (success && ZapUnusedHeapArea) { |
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342 // Mangle newly committed space immediately because it |
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343 // can be done here more simply that after the new |
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344 // spaces have been computed. |
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345 HeapWord* new_high = (HeapWord*) _virtual_space.high(); |
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346 MemRegion mangle_region(prev_high, new_high); |
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347 SpaceMangler::mangle_region(mangle_region); |
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348 } |
0 | 349 |
350 // Do not attempt an expand-to-the reserve size. The | |
351 // request should properly observe the maximum size of | |
352 // the generation so an expand-to-reserve should be | |
353 // unnecessary. Also a second call to expand-to-reserve | |
354 // value potentially can cause an undue expansion. | |
355 // For example if the first expand fail for unknown reasons, | |
356 // but the second succeeds and expands the heap to its maximum | |
357 // value. | |
358 if (GC_locker::is_active()) { | |
359 if (PrintGC && Verbose) { | |
263
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360 gclog_or_tty->print_cr("Garbage collection disabled, " |
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361 "expanded heap instead"); |
0 | 362 } |
363 } | |
364 | |
365 return success; | |
366 } | |
367 | |
368 | |
369 void DefNewGeneration::compute_new_size() { | |
370 // This is called after a gc that includes the following generation | |
371 // (which is required to exist.) So from-space will normally be empty. | |
372 // Note that we check both spaces, since if scavenge failed they revert roles. | |
373 // If not we bail out (otherwise we would have to relocate the objects) | |
374 if (!from()->is_empty() || !to()->is_empty()) { | |
375 return; | |
376 } | |
377 | |
378 int next_level = level() + 1; | |
379 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
380 assert(next_level < gch->_n_gens, | |
381 "DefNewGeneration cannot be an oldest gen"); | |
382 | |
383 Generation* next_gen = gch->_gens[next_level]; | |
384 size_t old_size = next_gen->capacity(); | |
385 size_t new_size_before = _virtual_space.committed_size(); | |
386 size_t min_new_size = spec()->init_size(); | |
387 size_t max_new_size = reserved().byte_size(); | |
388 assert(min_new_size <= new_size_before && | |
389 new_size_before <= max_new_size, | |
390 "just checking"); | |
391 // All space sizes must be multiples of Generation::GenGrain. | |
392 size_t alignment = Generation::GenGrain; | |
393 | |
394 // Compute desired new generation size based on NewRatio and | |
395 // NewSizeThreadIncrease | |
396 size_t desired_new_size = old_size/NewRatio; | |
397 int threads_count = Threads::number_of_non_daemon_threads(); | |
398 size_t thread_increase_size = threads_count * NewSizeThreadIncrease; | |
399 desired_new_size = align_size_up(desired_new_size + thread_increase_size, alignment); | |
400 | |
401 // Adjust new generation size | |
402 desired_new_size = MAX2(MIN2(desired_new_size, max_new_size), min_new_size); | |
403 assert(desired_new_size <= max_new_size, "just checking"); | |
404 | |
405 bool changed = false; | |
406 if (desired_new_size > new_size_before) { | |
407 size_t change = desired_new_size - new_size_before; | |
408 assert(change % alignment == 0, "just checking"); | |
409 if (expand(change)) { | |
410 changed = true; | |
411 } | |
412 // If the heap failed to expand to the desired size, | |
413 // "changed" will be false. If the expansion failed | |
414 // (and at this point it was expected to succeed), | |
415 // ignore the failure (leaving "changed" as false). | |
416 } | |
417 if (desired_new_size < new_size_before && eden()->is_empty()) { | |
418 // bail out of shrinking if objects in eden | |
419 size_t change = new_size_before - desired_new_size; | |
420 assert(change % alignment == 0, "just checking"); | |
421 _virtual_space.shrink_by(change); | |
422 changed = true; | |
423 } | |
424 if (changed) { | |
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425 // The spaces have already been mangled at this point but |
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426 // may not have been cleared (set top = bottom) and should be. |
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427 // Mangling was done when the heap was being expanded. |
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428 compute_space_boundaries(eden()->used(), |
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429 SpaceDecorator::Clear, |
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430 SpaceDecorator::DontMangle); |
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431 MemRegion cmr((HeapWord*)_virtual_space.low(), |
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432 (HeapWord*)_virtual_space.high()); |
0 | 433 Universe::heap()->barrier_set()->resize_covered_region(cmr); |
434 if (Verbose && PrintGC) { | |
435 size_t new_size_after = _virtual_space.committed_size(); | |
436 size_t eden_size_after = eden()->capacity(); | |
437 size_t survivor_size_after = from()->capacity(); | |
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438 gclog_or_tty->print("New generation size " SIZE_FORMAT "K->" |
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439 SIZE_FORMAT "K [eden=" |
0 | 440 SIZE_FORMAT "K,survivor=" SIZE_FORMAT "K]", |
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441 new_size_before/K, new_size_after/K, |
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442 eden_size_after/K, survivor_size_after/K); |
0 | 443 if (WizardMode) { |
444 gclog_or_tty->print("[allowed " SIZE_FORMAT "K extra for %d threads]", | |
445 thread_increase_size/K, threads_count); | |
446 } | |
447 gclog_or_tty->cr(); | |
448 } | |
449 } | |
450 } | |
451 | |
452 void DefNewGeneration::younger_refs_iterate(OopsInGenClosure* cl) { | |
453 assert(false, "NYI -- are you sure you want to call this?"); | |
454 } | |
455 | |
456 | |
457 size_t DefNewGeneration::capacity() const { | |
458 return eden()->capacity() | |
459 + from()->capacity(); // to() is only used during scavenge | |
460 } | |
461 | |
462 | |
463 size_t DefNewGeneration::used() const { | |
464 return eden()->used() | |
465 + from()->used(); // to() is only used during scavenge | |
466 } | |
467 | |
468 | |
469 size_t DefNewGeneration::free() const { | |
470 return eden()->free() | |
471 + from()->free(); // to() is only used during scavenge | |
472 } | |
473 | |
474 size_t DefNewGeneration::max_capacity() const { | |
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475 const size_t alignment = GenCollectedHeap::heap()->collector_policy()->space_alignment(); |
0 | 476 const size_t reserved_bytes = reserved().byte_size(); |
477 return reserved_bytes - compute_survivor_size(reserved_bytes, alignment); | |
478 } | |
479 | |
480 size_t DefNewGeneration::unsafe_max_alloc_nogc() const { | |
481 return eden()->free(); | |
482 } | |
483 | |
484 size_t DefNewGeneration::capacity_before_gc() const { | |
485 return eden()->capacity(); | |
486 } | |
487 | |
488 size_t DefNewGeneration::contiguous_available() const { | |
489 return eden()->free(); | |
490 } | |
491 | |
492 | |
493 HeapWord** DefNewGeneration::top_addr() const { return eden()->top_addr(); } | |
494 HeapWord** DefNewGeneration::end_addr() const { return eden()->end_addr(); } | |
495 | |
496 void DefNewGeneration::object_iterate(ObjectClosure* blk) { | |
497 eden()->object_iterate(blk); | |
498 from()->object_iterate(blk); | |
499 } | |
500 | |
501 | |
502 void DefNewGeneration::space_iterate(SpaceClosure* blk, | |
503 bool usedOnly) { | |
504 blk->do_space(eden()); | |
505 blk->do_space(from()); | |
506 blk->do_space(to()); | |
507 } | |
508 | |
509 // The last collection bailed out, we are running out of heap space, | |
510 // so we try to allocate the from-space, too. | |
511 HeapWord* DefNewGeneration::allocate_from_space(size_t size) { | |
512 HeapWord* result = NULL; | |
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513 if (Verbose && PrintGCDetails) { |
0 | 514 gclog_or_tty->print("DefNewGeneration::allocate_from_space(%u):" |
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515 " will_fail: %s" |
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516 " heap_lock: %s" |
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517 " free: " SIZE_FORMAT, |
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518 size, |
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519 GenCollectedHeap::heap()->incremental_collection_will_fail(false /* don't consult_young */) ? |
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520 "true" : "false", |
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521 Heap_lock->is_locked() ? "locked" : "unlocked", |
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522 from()->free()); |
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523 } |
0 | 524 if (should_allocate_from_space() || GC_locker::is_active_and_needs_gc()) { |
525 if (Heap_lock->owned_by_self() || | |
526 (SafepointSynchronize::is_at_safepoint() && | |
527 Thread::current()->is_VM_thread())) { | |
528 // If the Heap_lock is not locked by this thread, this will be called | |
529 // again later with the Heap_lock held. | |
530 result = from()->allocate(size); | |
531 } else if (PrintGC && Verbose) { | |
532 gclog_or_tty->print_cr(" Heap_lock is not owned by self"); | |
533 } | |
534 } else if (PrintGC && Verbose) { | |
535 gclog_or_tty->print_cr(" should_allocate_from_space: NOT"); | |
536 } | |
537 if (PrintGC && Verbose) { | |
538 gclog_or_tty->print_cr(" returns %s", result == NULL ? "NULL" : "object"); | |
539 } | |
540 return result; | |
541 } | |
542 | |
543 HeapWord* DefNewGeneration::expand_and_allocate(size_t size, | |
544 bool is_tlab, | |
545 bool parallel) { | |
546 // We don't attempt to expand the young generation (but perhaps we should.) | |
547 return allocate(size, is_tlab); | |
548 } | |
549 | |
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550 void DefNewGeneration::adjust_desired_tenuring_threshold() { |
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551 // Set the desired survivor size to half the real survivor space |
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552 _tenuring_threshold = |
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553 age_table()->compute_tenuring_threshold(to()->capacity()/HeapWordSize); |
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554 } |
0 | 555 |
556 void DefNewGeneration::collect(bool full, | |
557 bool clear_all_soft_refs, | |
558 size_t size, | |
559 bool is_tlab) { | |
560 assert(full || size > 0, "otherwise we don't want to collect"); | |
10405 | 561 |
0 | 562 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
10405 | 563 |
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564 _gc_timer->register_gc_start(); |
10405 | 565 DefNewTracer gc_tracer; |
566 gc_tracer.report_gc_start(gch->gc_cause(), _gc_timer->gc_start()); | |
567 | |
0 | 568 _next_gen = gch->next_gen(this); |
569 | |
10405 | 570 // If the next generation is too full to accommodate promotion |
0 | 571 // from this generation, pass on collection; let the next generation |
572 // do it. | |
573 if (!collection_attempt_is_safe()) { | |
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574 if (Verbose && PrintGCDetails) { |
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575 gclog_or_tty->print(" :: Collection attempt not safe :: "); |
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576 } |
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577 gch->set_incremental_collection_failed(); // Slight lie: we did not even attempt one |
0 | 578 return; |
579 } | |
580 assert(to()->is_empty(), "Else not collection_attempt_is_safe"); | |
581 | |
582 init_assuming_no_promotion_failure(); | |
583 | |
10405 | 584 GCTraceTime t1(GCCauseString("GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, NULL); |
0 | 585 // Capture heap used before collection (for printing). |
586 size_t gch_prev_used = gch->used(); | |
587 | |
10405 | 588 gch->trace_heap_before_gc(&gc_tracer); |
589 | |
0 | 590 SpecializationStats::clear(); |
591 | |
592 // These can be shared for all code paths | |
593 IsAliveClosure is_alive(this); | |
594 ScanWeakRefClosure scan_weak_ref(this); | |
595 | |
596 age_table()->clear(); | |
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597 to()->clear(SpaceDecorator::Mangle); |
0 | 598 |
599 gch->rem_set()->prepare_for_younger_refs_iterate(false); | |
600 | |
601 assert(gch->no_allocs_since_save_marks(0), | |
602 "save marks have not been newly set."); | |
603 | |
604 // Not very pretty. | |
605 CollectorPolicy* cp = gch->collector_policy(); | |
606 | |
607 FastScanClosure fsc_with_no_gc_barrier(this, false); | |
608 FastScanClosure fsc_with_gc_barrier(this, true); | |
609 | |
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610 KlassScanClosure klass_scan_closure(&fsc_with_no_gc_barrier, |
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611 gch->rem_set()->klass_rem_set()); |
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612 |
0 | 613 set_promo_failure_scan_stack_closure(&fsc_with_no_gc_barrier); |
614 FastEvacuateFollowersClosure evacuate_followers(gch, _level, this, | |
615 &fsc_with_no_gc_barrier, | |
616 &fsc_with_gc_barrier); | |
617 | |
618 assert(gch->no_allocs_since_save_marks(0), | |
619 "save marks have not been newly set."); | |
620 | |
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621 int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_ScavengeCodeCache; |
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622 |
0 | 623 gch->gen_process_strong_roots(_level, |
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624 true, // Process younger gens, if any, |
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625 // as strong roots. |
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626 true, // activate StrongRootsScope |
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627 SharedHeap::ScanningOption(so), |
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628 &fsc_with_no_gc_barrier, |
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629 &fsc_with_gc_barrier, |
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630 &klass_scan_closure); |
0 | 631 |
632 // "evacuate followers". | |
633 evacuate_followers.do_void(); | |
634 | |
635 FastKeepAliveClosure keep_alive(this, &scan_weak_ref); | |
453
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636 ReferenceProcessor* rp = ref_processor(); |
457
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637 rp->setup_policy(clear_all_soft_refs); |
10405 | 638 const ReferenceProcessorStats& stats = |
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639 rp->process_discovered_references(&is_alive, &keep_alive, &evacuate_followers, |
10405 | 640 NULL, _gc_timer); |
641 gc_tracer.report_gc_reference_stats(stats); | |
642 | |
643 if (!_promotion_failed) { | |
0 | 644 // Swap the survivor spaces. |
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645 eden()->clear(SpaceDecorator::Mangle); |
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646 from()->clear(SpaceDecorator::Mangle); |
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647 if (ZapUnusedHeapArea) { |
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648 // This is now done here because of the piece-meal mangling which |
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649 // can check for valid mangling at intermediate points in the |
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650 // collection(s). When a minor collection fails to collect |
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651 // sufficient space resizing of the young generation can occur |
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652 // an redistribute the spaces in the young generation. Mangle |
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653 // here so that unzapped regions don't get distributed to |
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654 // other spaces. |
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655 to()->mangle_unused_area(); |
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656 } |
0 | 657 swap_spaces(); |
658 | |
659 assert(to()->is_empty(), "to space should be empty now"); | |
660 | |
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661 adjust_desired_tenuring_threshold(); |
0 | 662 |
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663 // A successful scavenge should restart the GC time limit count which is |
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664 // for full GC's. |
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665 AdaptiveSizePolicy* size_policy = gch->gen_policy()->size_policy(); |
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666 size_policy->reset_gc_overhead_limit_count(); |
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667 assert(!gch->incremental_collection_failed(), "Should be clear"); |
0 | 668 } else { |
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669 assert(_promo_failure_scan_stack.is_empty(), "post condition"); |
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670 _promo_failure_scan_stack.clear(true); // Clear cached segments. |
0 | 671 |
672 remove_forwarding_pointers(); | |
673 if (PrintGCDetails) { | |
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674 gclog_or_tty->print(" (promotion failed) "); |
0 | 675 } |
676 // Add to-space to the list of space to compact | |
677 // when a promotion failure has occurred. In that | |
678 // case there can be live objects in to-space | |
679 // as a result of a partial evacuation of eden | |
680 // and from-space. | |
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681 swap_spaces(); // For uniformity wrt ParNewGeneration. |
0 | 682 from()->set_next_compaction_space(to()); |
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683 gch->set_incremental_collection_failed(); |
0 | 684 |
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685 // Inform the next generation that a promotion failure occurred. |
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686 _next_gen->promotion_failure_occurred(); |
10405 | 687 gc_tracer.report_promotion_failed(_promotion_failed_info); |
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688 |
0 | 689 // Reset the PromotionFailureALot counters. |
690 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
691 } | |
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692 if (PrintGC && !PrintGCDetails) { |
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693 gch->print_heap_change(gch_prev_used); |
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694 } |
0 | 695 // set new iteration safe limit for the survivor spaces |
696 from()->set_concurrent_iteration_safe_limit(from()->top()); | |
697 to()->set_concurrent_iteration_safe_limit(to()->top()); | |
698 SpecializationStats::print(); | |
4911 | 699 |
10405 | 700 // We need to use a monotonically non-decreasing time in ms |
4911 | 701 // or we will see time-warp warnings and os::javaTimeMillis() |
702 // does not guarantee monotonicity. | |
703 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; | |
704 update_time_of_last_gc(now); | |
10405 | 705 |
706 gch->trace_heap_after_gc(&gc_tracer); | |
707 gc_tracer.report_tenuring_threshold(tenuring_threshold()); | |
708 | |
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709 _gc_timer->register_gc_end(); |
10405 | 710 |
711 gc_tracer.report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions()); | |
0 | 712 } |
713 | |
714 class RemoveForwardPointerClosure: public ObjectClosure { | |
715 public: | |
716 void do_object(oop obj) { | |
717 obj->init_mark(); | |
718 } | |
719 }; | |
720 | |
721 void DefNewGeneration::init_assuming_no_promotion_failure() { | |
722 _promotion_failed = false; | |
10405 | 723 _promotion_failed_info.reset(); |
0 | 724 from()->set_next_compaction_space(NULL); |
725 } | |
726 | |
727 void DefNewGeneration::remove_forwarding_pointers() { | |
728 RemoveForwardPointerClosure rspc; | |
729 eden()->object_iterate(&rspc); | |
730 from()->object_iterate(&rspc); | |
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731 |
0 | 732 // Now restore saved marks, if any. |
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733 assert(_objs_with_preserved_marks.size() == _preserved_marks_of_objs.size(), |
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734 "should be the same"); |
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735 while (!_objs_with_preserved_marks.is_empty()) { |
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736 oop obj = _objs_with_preserved_marks.pop(); |
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737 markOop m = _preserved_marks_of_objs.pop(); |
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738 obj->set_mark(m); |
0 | 739 } |
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740 _objs_with_preserved_marks.clear(true); |
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741 _preserved_marks_of_objs.clear(true); |
0 | 742 } |
743 | |
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744 void DefNewGeneration::preserve_mark(oop obj, markOop m) { |
10405 | 745 assert(_promotion_failed && m->must_be_preserved_for_promotion_failure(obj), |
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746 "Oversaving!"); |
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747 _objs_with_preserved_marks.push(obj); |
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748 _preserved_marks_of_objs.push(m); |
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749 } |
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750 |
0 | 751 void DefNewGeneration::preserve_mark_if_necessary(oop obj, markOop m) { |
752 if (m->must_be_preserved_for_promotion_failure(obj)) { | |
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753 preserve_mark(obj, m); |
0 | 754 } |
755 } | |
756 | |
757 void DefNewGeneration::handle_promotion_failure(oop old) { | |
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758 if (PrintPromotionFailure && !_promotion_failed) { |
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759 gclog_or_tty->print(" (promotion failure size = " SIZE_FORMAT ") ", |
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760 old->size()); |
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761 } |
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762 _promotion_failed = true; |
10405 | 763 _promotion_failed_info.register_copy_failure(old->size()); |
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764 preserve_mark_if_necessary(old, old->mark()); |
0 | 765 // forward to self |
766 old->forward_to(old); | |
767 | |
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768 _promo_failure_scan_stack.push(old); |
0 | 769 |
770 if (!_promo_failure_drain_in_progress) { | |
771 // prevent recursion in copy_to_survivor_space() | |
772 _promo_failure_drain_in_progress = true; | |
773 drain_promo_failure_scan_stack(); | |
774 _promo_failure_drain_in_progress = false; | |
775 } | |
776 } | |
777 | |
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778 oop DefNewGeneration::copy_to_survivor_space(oop old) { |
0 | 779 assert(is_in_reserved(old) && !old->is_forwarded(), |
780 "shouldn't be scavenging this oop"); | |
781 size_t s = old->size(); | |
782 oop obj = NULL; | |
783 | |
784 // Try allocating obj in to-space (unless too old) | |
785 if (old->age() < tenuring_threshold()) { | |
786 obj = (oop) to()->allocate(s); | |
787 } | |
788 | |
789 // Otherwise try allocating obj tenured | |
790 if (obj == NULL) { | |
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791 obj = _next_gen->promote(old, s); |
0 | 792 if (obj == NULL) { |
793 handle_promotion_failure(old); | |
794 return old; | |
795 } | |
796 } else { | |
797 // Prefetch beyond obj | |
798 const intx interval = PrefetchCopyIntervalInBytes; | |
799 Prefetch::write(obj, interval); | |
800 | |
801 // Copy obj | |
802 Copy::aligned_disjoint_words((HeapWord*)old, (HeapWord*)obj, s); | |
803 | |
804 // Increment age if obj still in new generation | |
805 obj->incr_age(); | |
806 age_table()->add(obj, s); | |
807 } | |
808 | |
809 // Done, insert forward pointer to obj in this header | |
810 old->forward_to(obj); | |
811 | |
812 return obj; | |
813 } | |
814 | |
815 void DefNewGeneration::drain_promo_failure_scan_stack() { | |
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816 while (!_promo_failure_scan_stack.is_empty()) { |
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817 oop obj = _promo_failure_scan_stack.pop(); |
0 | 818 obj->oop_iterate(_promo_failure_scan_stack_closure); |
819 } | |
820 } | |
821 | |
822 void DefNewGeneration::save_marks() { | |
823 eden()->set_saved_mark(); | |
824 to()->set_saved_mark(); | |
825 from()->set_saved_mark(); | |
826 } | |
827 | |
828 | |
829 void DefNewGeneration::reset_saved_marks() { | |
830 eden()->reset_saved_mark(); | |
831 to()->reset_saved_mark(); | |
832 from()->reset_saved_mark(); | |
833 } | |
834 | |
835 | |
836 bool DefNewGeneration::no_allocs_since_save_marks() { | |
837 assert(eden()->saved_mark_at_top(), "Violated spec - alloc in eden"); | |
838 assert(from()->saved_mark_at_top(), "Violated spec - alloc in from"); | |
839 return to()->saved_mark_at_top(); | |
840 } | |
841 | |
842 #define DefNew_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
843 \ | |
844 void DefNewGeneration:: \ | |
845 oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
846 cl->set_generation(this); \ | |
847 eden()->oop_since_save_marks_iterate##nv_suffix(cl); \ | |
848 to()->oop_since_save_marks_iterate##nv_suffix(cl); \ | |
849 from()->oop_since_save_marks_iterate##nv_suffix(cl); \ | |
850 cl->reset_generation(); \ | |
851 save_marks(); \ | |
852 } | |
853 | |
854 ALL_SINCE_SAVE_MARKS_CLOSURES(DefNew_SINCE_SAVE_MARKS_DEFN) | |
855 | |
856 #undef DefNew_SINCE_SAVE_MARKS_DEFN | |
857 | |
858 void DefNewGeneration::contribute_scratch(ScratchBlock*& list, Generation* requestor, | |
859 size_t max_alloc_words) { | |
860 if (requestor == this || _promotion_failed) return; | |
861 assert(requestor->level() > level(), "DefNewGeneration must be youngest"); | |
862 | |
863 /* $$$ Assert this? "trace" is a "MarkSweep" function so that's not appropriate. | |
864 if (to_space->top() > to_space->bottom()) { | |
865 trace("to_space not empty when contribute_scratch called"); | |
866 } | |
867 */ | |
868 | |
869 ContiguousSpace* to_space = to(); | |
870 assert(to_space->end() >= to_space->top(), "pointers out of order"); | |
871 size_t free_words = pointer_delta(to_space->end(), to_space->top()); | |
872 if (free_words >= MinFreeScratchWords) { | |
873 ScratchBlock* sb = (ScratchBlock*)to_space->top(); | |
874 sb->num_words = free_words; | |
875 sb->next = list; | |
876 list = sb; | |
877 } | |
878 } | |
879 | |
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880 void DefNewGeneration::reset_scratch() { |
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881 // If contributing scratch in to_space, mangle all of |
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882 // to_space if ZapUnusedHeapArea. This is needed because |
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883 // top is not maintained while using to-space as scratch. |
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884 if (ZapUnusedHeapArea) { |
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885 to()->mangle_unused_area_complete(); |
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886 } |
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887 } |
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888 |
0 | 889 bool DefNewGeneration::collection_attempt_is_safe() { |
890 if (!to()->is_empty()) { | |
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891 if (Verbose && PrintGCDetails) { |
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892 gclog_or_tty->print(" :: to is not empty :: "); |
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893 } |
0 | 894 return false; |
895 } | |
896 if (_next_gen == NULL) { | |
897 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
898 _next_gen = gch->next_gen(this); | |
899 } | |
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900 return _next_gen->promotion_attempt_is_safe(used()); |
0 | 901 } |
902 | |
903 void DefNewGeneration::gc_epilogue(bool full) { | |
1889
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904 DEBUG_ONLY(static bool seen_incremental_collection_failed = false;) |
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905 |
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906 assert(!GC_locker::is_active(), "We should not be executing here"); |
0 | 907 // Check if the heap is approaching full after a collection has |
908 // been done. Generally the young generation is empty at | |
909 // a minimum at the end of a collection. If it is not, then | |
910 // the heap is approaching full. | |
911 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
1888
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912 if (full) { |
1889
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913 DEBUG_ONLY(seen_incremental_collection_failed = false;) |
1994
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914 if (!collection_attempt_is_safe() && !_eden_space->is_empty()) { |
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915 if (Verbose && PrintGCDetails) { |
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916 gclog_or_tty->print("DefNewEpilogue: cause(%s), full, not safe, set_failed, set_alloc_from, clear_seen", |
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917 GCCause::to_string(gch->gc_cause())); |
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918 } |
1888
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919 gch->set_incremental_collection_failed(); // Slight lie: a full gc left us in that state |
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920 set_should_allocate_from_space(); // we seem to be running out of space |
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921 } else { |
1994
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922 if (Verbose && PrintGCDetails) { |
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923 gclog_or_tty->print("DefNewEpilogue: cause(%s), full, safe, clear_failed, clear_alloc_from, clear_seen", |
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924 GCCause::to_string(gch->gc_cause())); |
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925 } |
1888
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926 gch->clear_incremental_collection_failed(); // We just did a full collection |
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927 clear_should_allocate_from_space(); // if set |
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928 } |
0 | 929 } else { |
1889
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930 #ifdef ASSERT |
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931 // It is possible that incremental_collection_failed() == true |
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932 // here, because an attempted scavenge did not succeed. The policy |
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933 // is normally expected to cause a full collection which should |
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934 // clear that condition, so we should not be here twice in a row |
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935 // with incremental_collection_failed() == true without having done |
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936 // a full collection in between. |
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937 if (!seen_incremental_collection_failed && |
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938 gch->incremental_collection_failed()) { |
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939 if (Verbose && PrintGCDetails) { |
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940 gclog_or_tty->print("DefNewEpilogue: cause(%s), not full, not_seen_failed, failed, set_seen_failed", |
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941 GCCause::to_string(gch->gc_cause())); |
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942 } |
1889
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943 seen_incremental_collection_failed = true; |
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944 } else if (seen_incremental_collection_failed) { |
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945 if (Verbose && PrintGCDetails) { |
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946 gclog_or_tty->print("DefNewEpilogue: cause(%s), not full, seen_failed, will_clear_seen_failed", |
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947 GCCause::to_string(gch->gc_cause())); |
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948 } |
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949 assert(gch->gc_cause() == GCCause::_scavenge_alot || |
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950 (gch->gc_cause() == GCCause::_java_lang_system_gc && UseConcMarkSweepGC && ExplicitGCInvokesConcurrent) || |
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951 !gch->incremental_collection_failed(), |
1953
8d81b4a1d3e1
6998802: ScavengeALot: assert(!gch->incremental_collection_failed()) failed: Twice in a row
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952 "Twice in a row"); |
1889
c766bae6c14d
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
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953 seen_incremental_collection_failed = false; |
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954 } |
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955 #endif // ASSERT |
0 | 956 } |
957 | |
263
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958 if (ZapUnusedHeapArea) { |
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959 eden()->check_mangled_unused_area_complete(); |
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960 from()->check_mangled_unused_area_complete(); |
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961 to()->check_mangled_unused_area_complete(); |
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962 } |
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963 |
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964 if (!CleanChunkPoolAsync) { |
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965 Chunk::clean_chunk_pool(); |
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966 } |
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967 |
0 | 968 // update the generation and space performance counters |
969 update_counters(); | |
970 gch->collector_policy()->counters()->update_counters(); | |
971 } | |
972 | |
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973 void DefNewGeneration::record_spaces_top() { |
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974 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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975 eden()->set_top_for_allocations(); |
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976 to()->set_top_for_allocations(); |
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977 from()->set_top_for_allocations(); |
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978 } |
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979 |
10405 | 980 void DefNewGeneration::ref_processor_init() { |
981 Generation::ref_processor_init(); | |
982 } | |
983 | |
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984 |
0 | 985 void DefNewGeneration::update_counters() { |
986 if (UsePerfData) { | |
987 _eden_counters->update_all(); | |
988 _from_counters->update_all(); | |
989 _to_counters->update_all(); | |
990 _gen_counters->update_all(); | |
991 } | |
992 } | |
993 | |
6008 | 994 void DefNewGeneration::verify() { |
995 eden()->verify(); | |
996 from()->verify(); | |
997 to()->verify(); | |
0 | 998 } |
999 | |
1000 void DefNewGeneration::print_on(outputStream* st) const { | |
1001 Generation::print_on(st); | |
1002 st->print(" eden"); | |
1003 eden()->print_on(st); | |
1004 st->print(" from"); | |
1005 from()->print_on(st); | |
1006 st->print(" to "); | |
1007 to()->print_on(st); | |
1008 } | |
1009 | |
1010 | |
1011 const char* DefNewGeneration::name() const { | |
1012 return "def new generation"; | |
1013 } | |
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1014 |
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1015 // Moved from inline file as they are not called inline |
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1016 CompactibleSpace* DefNewGeneration::first_compaction_space() const { |
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1017 return eden(); |
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1018 } |
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1019 |
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1020 HeapWord* DefNewGeneration::allocate(size_t word_size, |
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1021 bool is_tlab) { |
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1022 // This is the slow-path allocation for the DefNewGeneration. |
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1023 // Most allocations are fast-path in compiled code. |
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1024 // We try to allocate from the eden. If that works, we are happy. |
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1025 // Note that since DefNewGeneration supports lock-free allocation, we |
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1026 // have to use it here, as well. |
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1027 HeapWord* result = eden()->par_allocate(word_size); |
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1028 if (result != NULL) { |
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1029 if (CMSEdenChunksRecordAlways && _next_gen != NULL) { |
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1030 _next_gen->sample_eden_chunk(); |
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1031 } |
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1032 return result; |
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1033 } |
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1034 do { |
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1035 HeapWord* old_limit = eden()->soft_end(); |
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1036 if (old_limit < eden()->end()) { |
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1037 // Tell the next generation we reached a limit. |
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1038 HeapWord* new_limit = |
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1039 next_gen()->allocation_limit_reached(eden(), eden()->top(), word_size); |
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1040 if (new_limit != NULL) { |
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1041 Atomic::cmpxchg_ptr(new_limit, eden()->soft_end_addr(), old_limit); |
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1042 } else { |
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1043 assert(eden()->soft_end() == eden()->end(), |
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1044 "invalid state after allocation_limit_reached returned null"); |
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1045 } |
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1046 } else { |
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1047 // The allocation failed and the soft limit is equal to the hard limit, |
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1048 // there are no reasons to do an attempt to allocate |
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1049 assert(old_limit == eden()->end(), "sanity check"); |
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1050 break; |
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1051 } |
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1052 // Try to allocate until succeeded or the soft limit can't be adjusted |
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1053 result = eden()->par_allocate(word_size); |
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1054 } while (result == NULL); |
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1055 |
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1056 // If the eden is full and the last collection bailed out, we are running |
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1057 // out of heap space, and we try to allocate the from-space, too. |
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1058 // allocate_from_space can't be inlined because that would introduce a |
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1059 // circular dependency at compile time. |
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1060 if (result == NULL) { |
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1061 result = allocate_from_space(word_size); |
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1062 } else if (CMSEdenChunksRecordAlways && _next_gen != NULL) { |
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1063 _next_gen->sample_eden_chunk(); |
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1064 } |
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1065 return result; |
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1066 } |
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1067 |
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1068 HeapWord* DefNewGeneration::par_allocate(size_t word_size, |
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1069 bool is_tlab) { |
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1070 HeapWord* res = eden()->par_allocate(word_size); |
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1071 if (CMSEdenChunksRecordAlways && _next_gen != NULL) { |
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1072 _next_gen->sample_eden_chunk(); |
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1073 } |
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1074 return res; |
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1075 } |
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1076 |
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1077 void DefNewGeneration::gc_prologue(bool full) { |
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1078 // Ensure that _end and _soft_end are the same in eden space. |
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1079 eden()->set_soft_end(eden()->end()); |
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1080 } |
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1081 |
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1082 size_t DefNewGeneration::tlab_capacity() const { |
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1083 return eden()->capacity(); |
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1084 } |
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1085 |
14310 | 1086 size_t DefNewGeneration::tlab_used() const { |
1087 return eden()->used(); | |
1088 } | |
1089 | |
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1090 size_t DefNewGeneration::unsafe_max_tlab_alloc() const { |
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1091 return unsafe_max_alloc_nogc(); |
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1092 } |