Mercurial > hg > truffle
annotate src/share/vm/memory/defNewGeneration.cpp @ 20470:bc4ce33c0985
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Reviewed-by: roland, iveresov
author | vlivanov |
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date | Mon, 14 Jul 2014 03:27:21 -0700 |
parents | ee019285a52c |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2014, 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/prefetch.inline.hpp" |
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46 #include "runtime/thread.inline.hpp" |
1972 | 47 #include "utilities/copy.hpp" |
48 #include "utilities/stack.inline.hpp" | |
0 | 49 |
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50 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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51 |
0 | 52 // |
53 // DefNewGeneration functions. | |
54 | |
55 // Methods of protected closure types. | |
56 | |
57 DefNewGeneration::IsAliveClosure::IsAliveClosure(Generation* g) : _g(g) { | |
58 assert(g->level() == 0, "Optimized for youngest gen."); | |
59 } | |
60 bool DefNewGeneration::IsAliveClosure::do_object_b(oop p) { | |
61 return (HeapWord*)p >= _g->reserved().end() || p->is_forwarded(); | |
62 } | |
63 | |
64 DefNewGeneration::KeepAliveClosure:: | |
65 KeepAliveClosure(ScanWeakRefClosure* cl) : _cl(cl) { | |
66 GenRemSet* rs = GenCollectedHeap::heap()->rem_set(); | |
67 assert(rs->rs_kind() == GenRemSet::CardTable, "Wrong rem set kind."); | |
68 _rs = (CardTableRS*)rs; | |
69 } | |
70 | |
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71 void DefNewGeneration::KeepAliveClosure::do_oop(oop* p) { DefNewGeneration::KeepAliveClosure::do_oop_work(p); } |
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72 void DefNewGeneration::KeepAliveClosure::do_oop(narrowOop* p) { DefNewGeneration::KeepAliveClosure::do_oop_work(p); } |
0 | 73 |
74 | |
75 DefNewGeneration::FastKeepAliveClosure:: | |
76 FastKeepAliveClosure(DefNewGeneration* g, ScanWeakRefClosure* cl) : | |
77 DefNewGeneration::KeepAliveClosure(cl) { | |
78 _boundary = g->reserved().end(); | |
79 } | |
80 | |
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81 void DefNewGeneration::FastKeepAliveClosure::do_oop(oop* p) { DefNewGeneration::FastKeepAliveClosure::do_oop_work(p); } |
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82 void DefNewGeneration::FastKeepAliveClosure::do_oop(narrowOop* p) { DefNewGeneration::FastKeepAliveClosure::do_oop_work(p); } |
0 | 83 |
84 DefNewGeneration::EvacuateFollowersClosure:: | |
85 EvacuateFollowersClosure(GenCollectedHeap* gch, int level, | |
86 ScanClosure* cur, ScanClosure* older) : | |
87 _gch(gch), _level(level), | |
88 _scan_cur_or_nonheap(cur), _scan_older(older) | |
89 {} | |
90 | |
91 void DefNewGeneration::EvacuateFollowersClosure::do_void() { | |
92 do { | |
93 _gch->oop_since_save_marks_iterate(_level, _scan_cur_or_nonheap, | |
94 _scan_older); | |
95 } while (!_gch->no_allocs_since_save_marks(_level)); | |
96 } | |
97 | |
98 DefNewGeneration::FastEvacuateFollowersClosure:: | |
99 FastEvacuateFollowersClosure(GenCollectedHeap* gch, int level, | |
100 DefNewGeneration* gen, | |
101 FastScanClosure* cur, FastScanClosure* older) : | |
102 _gch(gch), _level(level), _gen(gen), | |
103 _scan_cur_or_nonheap(cur), _scan_older(older) | |
104 {} | |
105 | |
106 void DefNewGeneration::FastEvacuateFollowersClosure::do_void() { | |
107 do { | |
108 _gch->oop_since_save_marks_iterate(_level, _scan_cur_or_nonheap, | |
109 _scan_older); | |
110 } while (!_gch->no_allocs_since_save_marks(_level)); | |
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111 guarantee(_gen->promo_failure_scan_is_complete(), "Failed to finish scan"); |
0 | 112 } |
113 | |
114 ScanClosure::ScanClosure(DefNewGeneration* g, bool gc_barrier) : | |
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115 OopsInKlassOrGenClosure(g), _g(g), _gc_barrier(gc_barrier) |
0 | 116 { |
117 assert(_g->level() == 0, "Optimized for youngest generation"); | |
118 _boundary = _g->reserved().end(); | |
119 } | |
120 | |
113
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121 void ScanClosure::do_oop(oop* p) { ScanClosure::do_oop_work(p); } |
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122 void ScanClosure::do_oop(narrowOop* p) { ScanClosure::do_oop_work(p); } |
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123 |
0 | 124 FastScanClosure::FastScanClosure(DefNewGeneration* g, bool gc_barrier) : |
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125 OopsInKlassOrGenClosure(g), _g(g), _gc_barrier(gc_barrier) |
0 | 126 { |
127 assert(_g->level() == 0, "Optimized for youngest generation"); | |
128 _boundary = _g->reserved().end(); | |
129 } | |
130 | |
113
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131 void FastScanClosure::do_oop(oop* p) { FastScanClosure::do_oop_work(p); } |
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132 void FastScanClosure::do_oop(narrowOop* p) { FastScanClosure::do_oop_work(p); } |
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133 |
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134 void KlassScanClosure::do_klass(Klass* klass) { |
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135 #ifndef PRODUCT |
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136 if (TraceScavenge) { |
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137 ResourceMark rm; |
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138 gclog_or_tty->print_cr("KlassScanClosure::do_klass %p, %s, dirty: %s", |
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139 klass, |
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140 klass->external_name(), |
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141 klass->has_modified_oops() ? "true" : "false"); |
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142 } |
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143 #endif |
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144 |
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145 // If the klass has not been dirtied we know that there's |
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146 // no references into the young gen and we can skip it. |
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147 if (klass->has_modified_oops()) { |
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148 if (_accumulate_modified_oops) { |
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149 klass->accumulate_modified_oops(); |
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150 } |
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151 |
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152 // Clear this state since we're going to scavenge all the metadata. |
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153 klass->clear_modified_oops(); |
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154 |
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155 // Tell the closure which Klass is being scanned so that it can be dirtied |
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156 // if oops are left pointing into the young gen. |
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157 _scavenge_closure->set_scanned_klass(klass); |
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158 |
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159 klass->oops_do(_scavenge_closure); |
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160 |
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161 _scavenge_closure->set_scanned_klass(NULL); |
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162 } |
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163 } |
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164 |
0 | 165 ScanWeakRefClosure::ScanWeakRefClosure(DefNewGeneration* g) : |
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166 _g(g) |
0 | 167 { |
168 assert(_g->level() == 0, "Optimized for youngest generation"); | |
169 _boundary = _g->reserved().end(); | |
170 } | |
171 | |
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172 void ScanWeakRefClosure::do_oop(oop* p) { ScanWeakRefClosure::do_oop_work(p); } |
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173 void ScanWeakRefClosure::do_oop(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); } |
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174 |
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175 void FilteringClosure::do_oop(oop* p) { FilteringClosure::do_oop_work(p); } |
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176 void FilteringClosure::do_oop(narrowOop* p) { FilteringClosure::do_oop_work(p); } |
0 | 177 |
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178 KlassScanClosure::KlassScanClosure(OopsInKlassOrGenClosure* scavenge_closure, |
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179 KlassRemSet* klass_rem_set) |
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180 : _scavenge_closure(scavenge_closure), |
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181 _accumulate_modified_oops(klass_rem_set->accumulate_modified_oops()) {} |
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182 |
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183 |
0 | 184 DefNewGeneration::DefNewGeneration(ReservedSpace rs, |
185 size_t initial_size, | |
186 int level, | |
187 const char* policy) | |
188 : Generation(rs, initial_size, level), | |
189 _promo_failure_drain_in_progress(false), | |
190 _should_allocate_from_space(false) | |
191 { | |
192 MemRegion cmr((HeapWord*)_virtual_space.low(), | |
193 (HeapWord*)_virtual_space.high()); | |
194 Universe::heap()->barrier_set()->resize_covered_region(cmr); | |
195 | |
196 if (GenCollectedHeap::heap()->collector_policy()->has_soft_ended_eden()) { | |
197 _eden_space = new ConcEdenSpace(this); | |
198 } else { | |
199 _eden_space = new EdenSpace(this); | |
200 } | |
201 _from_space = new ContiguousSpace(); | |
202 _to_space = new ContiguousSpace(); | |
203 | |
204 if (_eden_space == NULL || _from_space == NULL || _to_space == NULL) | |
205 vm_exit_during_initialization("Could not allocate a new gen space"); | |
206 | |
207 // Compute the maximum eden and survivor space sizes. These sizes | |
208 // are computed assuming the entire reserved space is committed. | |
209 // These values are exported as performance counters. | |
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210 uintx alignment = GenCollectedHeap::heap()->collector_policy()->space_alignment(); |
0 | 211 uintx size = _virtual_space.reserved_size(); |
212 _max_survivor_size = compute_survivor_size(size, alignment); | |
213 _max_eden_size = size - (2*_max_survivor_size); | |
214 | |
215 // allocate the performance counters | |
216 | |
217 // Generation counters -- generation 0, 3 subspaces | |
218 _gen_counters = new GenerationCounters("new", 0, 3, &_virtual_space); | |
219 _gc_counters = new CollectorCounters(policy, 0); | |
220 | |
221 _eden_counters = new CSpaceCounters("eden", 0, _max_eden_size, _eden_space, | |
222 _gen_counters); | |
223 _from_counters = new CSpaceCounters("s0", 1, _max_survivor_size, _from_space, | |
224 _gen_counters); | |
225 _to_counters = new CSpaceCounters("s1", 2, _max_survivor_size, _to_space, | |
226 _gen_counters); | |
227 | |
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228 compute_space_boundaries(0, SpaceDecorator::Clear, SpaceDecorator::Mangle); |
0 | 229 update_counters(); |
230 _next_gen = NULL; | |
231 _tenuring_threshold = MaxTenuringThreshold; | |
232 _pretenure_size_threshold_words = PretenureSizeThreshold >> LogHeapWordSize; | |
10405 | 233 |
234 _gc_timer = new (ResourceObj::C_HEAP, mtGC) STWGCTimer(); | |
0 | 235 } |
236 | |
263
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237 void DefNewGeneration::compute_space_boundaries(uintx minimum_eden_size, |
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238 bool clear_space, |
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239 bool mangle_space) { |
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240 uintx alignment = |
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241 GenCollectedHeap::heap()->collector_policy()->space_alignment(); |
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242 |
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243 // If the spaces are being cleared (only done at heap initialization |
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244 // currently), the survivor spaces need not be empty. |
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245 // Otherwise, no care is taken for used areas in the survivor spaces |
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246 // so check. |
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247 assert(clear_space || (to()->is_empty() && from()->is_empty()), |
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248 "Initialization of the survivor spaces assumes these are empty"); |
0 | 249 |
250 // Compute sizes | |
251 uintx size = _virtual_space.committed_size(); | |
252 uintx survivor_size = compute_survivor_size(size, alignment); | |
253 uintx eden_size = size - (2*survivor_size); | |
254 assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); | |
255 | |
256 if (eden_size < minimum_eden_size) { | |
257 // May happen due to 64Kb rounding, if so adjust eden size back up | |
258 minimum_eden_size = align_size_up(minimum_eden_size, alignment); | |
259 uintx maximum_survivor_size = (size - minimum_eden_size) / 2; | |
260 uintx unaligned_survivor_size = | |
261 align_size_down(maximum_survivor_size, alignment); | |
262 survivor_size = MAX2(unaligned_survivor_size, alignment); | |
263 eden_size = size - (2*survivor_size); | |
264 assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); | |
265 assert(eden_size >= minimum_eden_size, "just checking"); | |
266 } | |
267 | |
268 char *eden_start = _virtual_space.low(); | |
269 char *from_start = eden_start + eden_size; | |
270 char *to_start = from_start + survivor_size; | |
271 char *to_end = to_start + survivor_size; | |
272 | |
273 assert(to_end == _virtual_space.high(), "just checking"); | |
274 assert(Space::is_aligned((HeapWord*)eden_start), "checking alignment"); | |
275 assert(Space::is_aligned((HeapWord*)from_start), "checking alignment"); | |
276 assert(Space::is_aligned((HeapWord*)to_start), "checking alignment"); | |
277 | |
278 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)from_start); | |
279 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)to_start); | |
280 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
281 | |
263
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282 // A minimum eden size implies that there is a part of eden that |
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283 // is being used and that affects the initialization of any |
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284 // newly formed eden. |
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285 bool live_in_eden = minimum_eden_size > 0; |
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286 |
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287 // If not clearing the spaces, do some checking to verify that |
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288 // the space are already mangled. |
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289 if (!clear_space) { |
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290 // Must check mangling before the spaces are reshaped. Otherwise, |
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291 // the bottom or end of one space may have moved into another |
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292 // a failure of the check may not correctly indicate which space |
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293 // is not properly mangled. |
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294 if (ZapUnusedHeapArea) { |
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295 HeapWord* limit = (HeapWord*) _virtual_space.high(); |
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296 eden()->check_mangled_unused_area(limit); |
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297 from()->check_mangled_unused_area(limit); |
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298 to()->check_mangled_unused_area(limit); |
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299 } |
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300 } |
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301 |
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302 // Reset the spaces for their new regions. |
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303 eden()->initialize(edenMR, |
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304 clear_space && !live_in_eden, |
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305 SpaceDecorator::Mangle); |
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306 // If clear_space and live_in_eden, we will not have cleared any |
0 | 307 // portion of eden above its top. This can cause newly |
308 // expanded space not to be mangled if using ZapUnusedHeapArea. | |
309 // We explicitly do such mangling here. | |
263
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310 if (ZapUnusedHeapArea && clear_space && live_in_eden && mangle_space) { |
0 | 311 eden()->mangle_unused_area(); |
312 } | |
263
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313 from()->initialize(fromMR, clear_space, mangle_space); |
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314 to()->initialize(toMR, clear_space, mangle_space); |
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315 |
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316 // Set next compaction spaces. |
0 | 317 eden()->set_next_compaction_space(from()); |
318 // The to-space is normally empty before a compaction so need | |
319 // not be considered. The exception is during promotion | |
320 // failure handling when to-space can contain live objects. | |
321 from()->set_next_compaction_space(NULL); | |
322 } | |
323 | |
324 void DefNewGeneration::swap_spaces() { | |
325 ContiguousSpace* s = from(); | |
326 _from_space = to(); | |
327 _to_space = s; | |
328 eden()->set_next_compaction_space(from()); | |
329 // The to-space is normally empty before a compaction so need | |
330 // not be considered. The exception is during promotion | |
331 // failure handling when to-space can contain live objects. | |
332 from()->set_next_compaction_space(NULL); | |
333 | |
334 if (UsePerfData) { | |
335 CSpaceCounters* c = _from_counters; | |
336 _from_counters = _to_counters; | |
337 _to_counters = c; | |
338 } | |
339 } | |
340 | |
341 bool DefNewGeneration::expand(size_t bytes) { | |
342 MutexLocker x(ExpandHeap_lock); | |
263
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343 HeapWord* prev_high = (HeapWord*) _virtual_space.high(); |
0 | 344 bool success = _virtual_space.expand_by(bytes); |
263
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345 if (success && ZapUnusedHeapArea) { |
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346 // Mangle newly committed space immediately because it |
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347 // can be done here more simply that after the new |
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348 // spaces have been computed. |
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349 HeapWord* new_high = (HeapWord*) _virtual_space.high(); |
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350 MemRegion mangle_region(prev_high, new_high); |
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351 SpaceMangler::mangle_region(mangle_region); |
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352 } |
0 | 353 |
354 // Do not attempt an expand-to-the reserve size. The | |
355 // request should properly observe the maximum size of | |
356 // the generation so an expand-to-reserve should be | |
357 // unnecessary. Also a second call to expand-to-reserve | |
358 // value potentially can cause an undue expansion. | |
359 // For example if the first expand fail for unknown reasons, | |
360 // but the second succeeds and expands the heap to its maximum | |
361 // value. | |
362 if (GC_locker::is_active()) { | |
363 if (PrintGC && Verbose) { | |
263
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364 gclog_or_tty->print_cr("Garbage collection disabled, " |
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365 "expanded heap instead"); |
0 | 366 } |
367 } | |
368 | |
369 return success; | |
370 } | |
371 | |
372 | |
373 void DefNewGeneration::compute_new_size() { | |
374 // This is called after a gc that includes the following generation | |
375 // (which is required to exist.) So from-space will normally be empty. | |
376 // Note that we check both spaces, since if scavenge failed they revert roles. | |
377 // If not we bail out (otherwise we would have to relocate the objects) | |
378 if (!from()->is_empty() || !to()->is_empty()) { | |
379 return; | |
380 } | |
381 | |
382 int next_level = level() + 1; | |
383 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
384 assert(next_level < gch->_n_gens, | |
385 "DefNewGeneration cannot be an oldest gen"); | |
386 | |
387 Generation* next_gen = gch->_gens[next_level]; | |
388 size_t old_size = next_gen->capacity(); | |
389 size_t new_size_before = _virtual_space.committed_size(); | |
390 size_t min_new_size = spec()->init_size(); | |
391 size_t max_new_size = reserved().byte_size(); | |
392 assert(min_new_size <= new_size_before && | |
393 new_size_before <= max_new_size, | |
394 "just checking"); | |
395 // All space sizes must be multiples of Generation::GenGrain. | |
396 size_t alignment = Generation::GenGrain; | |
397 | |
398 // Compute desired new generation size based on NewRatio and | |
399 // NewSizeThreadIncrease | |
400 size_t desired_new_size = old_size/NewRatio; | |
401 int threads_count = Threads::number_of_non_daemon_threads(); | |
402 size_t thread_increase_size = threads_count * NewSizeThreadIncrease; | |
403 desired_new_size = align_size_up(desired_new_size + thread_increase_size, alignment); | |
404 | |
405 // Adjust new generation size | |
406 desired_new_size = MAX2(MIN2(desired_new_size, max_new_size), min_new_size); | |
407 assert(desired_new_size <= max_new_size, "just checking"); | |
408 | |
409 bool changed = false; | |
410 if (desired_new_size > new_size_before) { | |
411 size_t change = desired_new_size - new_size_before; | |
412 assert(change % alignment == 0, "just checking"); | |
413 if (expand(change)) { | |
414 changed = true; | |
415 } | |
416 // If the heap failed to expand to the desired size, | |
417 // "changed" will be false. If the expansion failed | |
418 // (and at this point it was expected to succeed), | |
419 // ignore the failure (leaving "changed" as false). | |
420 } | |
421 if (desired_new_size < new_size_before && eden()->is_empty()) { | |
422 // bail out of shrinking if objects in eden | |
423 size_t change = new_size_before - desired_new_size; | |
424 assert(change % alignment == 0, "just checking"); | |
425 _virtual_space.shrink_by(change); | |
426 changed = true; | |
427 } | |
428 if (changed) { | |
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429 // The spaces have already been mangled at this point but |
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430 // may not have been cleared (set top = bottom) and should be. |
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431 // Mangling was done when the heap was being expanded. |
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432 compute_space_boundaries(eden()->used(), |
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433 SpaceDecorator::Clear, |
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434 SpaceDecorator::DontMangle); |
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435 MemRegion cmr((HeapWord*)_virtual_space.low(), |
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436 (HeapWord*)_virtual_space.high()); |
0 | 437 Universe::heap()->barrier_set()->resize_covered_region(cmr); |
438 if (Verbose && PrintGC) { | |
439 size_t new_size_after = _virtual_space.committed_size(); | |
440 size_t eden_size_after = eden()->capacity(); | |
441 size_t survivor_size_after = from()->capacity(); | |
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442 gclog_or_tty->print("New generation size " SIZE_FORMAT "K->" |
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443 SIZE_FORMAT "K [eden=" |
0 | 444 SIZE_FORMAT "K,survivor=" SIZE_FORMAT "K]", |
263
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445 new_size_before/K, new_size_after/K, |
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446 eden_size_after/K, survivor_size_after/K); |
0 | 447 if (WizardMode) { |
448 gclog_or_tty->print("[allowed " SIZE_FORMAT "K extra for %d threads]", | |
449 thread_increase_size/K, threads_count); | |
450 } | |
451 gclog_or_tty->cr(); | |
452 } | |
453 } | |
454 } | |
455 | |
456 void DefNewGeneration::younger_refs_iterate(OopsInGenClosure* cl) { | |
457 assert(false, "NYI -- are you sure you want to call this?"); | |
458 } | |
459 | |
460 | |
461 size_t DefNewGeneration::capacity() const { | |
462 return eden()->capacity() | |
463 + from()->capacity(); // to() is only used during scavenge | |
464 } | |
465 | |
466 | |
467 size_t DefNewGeneration::used() const { | |
468 return eden()->used() | |
469 + from()->used(); // to() is only used during scavenge | |
470 } | |
471 | |
472 | |
473 size_t DefNewGeneration::free() const { | |
474 return eden()->free() | |
475 + from()->free(); // to() is only used during scavenge | |
476 } | |
477 | |
478 size_t DefNewGeneration::max_capacity() const { | |
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479 const size_t alignment = GenCollectedHeap::heap()->collector_policy()->space_alignment(); |
0 | 480 const size_t reserved_bytes = reserved().byte_size(); |
481 return reserved_bytes - compute_survivor_size(reserved_bytes, alignment); | |
482 } | |
483 | |
484 size_t DefNewGeneration::unsafe_max_alloc_nogc() const { | |
485 return eden()->free(); | |
486 } | |
487 | |
488 size_t DefNewGeneration::capacity_before_gc() const { | |
489 return eden()->capacity(); | |
490 } | |
491 | |
492 size_t DefNewGeneration::contiguous_available() const { | |
493 return eden()->free(); | |
494 } | |
495 | |
496 | |
497 HeapWord** DefNewGeneration::top_addr() const { return eden()->top_addr(); } | |
498 HeapWord** DefNewGeneration::end_addr() const { return eden()->end_addr(); } | |
499 | |
500 void DefNewGeneration::object_iterate(ObjectClosure* blk) { | |
501 eden()->object_iterate(blk); | |
502 from()->object_iterate(blk); | |
503 } | |
504 | |
505 | |
506 void DefNewGeneration::space_iterate(SpaceClosure* blk, | |
507 bool usedOnly) { | |
508 blk->do_space(eden()); | |
509 blk->do_space(from()); | |
510 blk->do_space(to()); | |
511 } | |
512 | |
513 // The last collection bailed out, we are running out of heap space, | |
514 // so we try to allocate the from-space, too. | |
515 HeapWord* DefNewGeneration::allocate_from_space(size_t size) { | |
516 HeapWord* result = NULL; | |
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517 if (Verbose && PrintGCDetails) { |
0 | 518 gclog_or_tty->print("DefNewGeneration::allocate_from_space(%u):" |
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519 " will_fail: %s" |
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520 " heap_lock: %s" |
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521 " free: " SIZE_FORMAT, |
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522 size, |
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523 GenCollectedHeap::heap()->incremental_collection_will_fail(false /* don't consult_young */) ? |
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524 "true" : "false", |
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525 Heap_lock->is_locked() ? "locked" : "unlocked", |
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526 from()->free()); |
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527 } |
0 | 528 if (should_allocate_from_space() || GC_locker::is_active_and_needs_gc()) { |
529 if (Heap_lock->owned_by_self() || | |
530 (SafepointSynchronize::is_at_safepoint() && | |
531 Thread::current()->is_VM_thread())) { | |
532 // If the Heap_lock is not locked by this thread, this will be called | |
533 // again later with the Heap_lock held. | |
534 result = from()->allocate(size); | |
535 } else if (PrintGC && Verbose) { | |
536 gclog_or_tty->print_cr(" Heap_lock is not owned by self"); | |
537 } | |
538 } else if (PrintGC && Verbose) { | |
539 gclog_or_tty->print_cr(" should_allocate_from_space: NOT"); | |
540 } | |
541 if (PrintGC && Verbose) { | |
542 gclog_or_tty->print_cr(" returns %s", result == NULL ? "NULL" : "object"); | |
543 } | |
544 return result; | |
545 } | |
546 | |
547 HeapWord* DefNewGeneration::expand_and_allocate(size_t size, | |
548 bool is_tlab, | |
549 bool parallel) { | |
550 // We don't attempt to expand the young generation (but perhaps we should.) | |
551 return allocate(size, is_tlab); | |
552 } | |
553 | |
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554 void DefNewGeneration::adjust_desired_tenuring_threshold() { |
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555 // Set the desired survivor size to half the real survivor space |
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556 _tenuring_threshold = |
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557 age_table()->compute_tenuring_threshold(to()->capacity()/HeapWordSize); |
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558 } |
0 | 559 |
560 void DefNewGeneration::collect(bool full, | |
561 bool clear_all_soft_refs, | |
562 size_t size, | |
563 bool is_tlab) { | |
564 assert(full || size > 0, "otherwise we don't want to collect"); | |
10405 | 565 |
0 | 566 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
10405 | 567 |
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568 _gc_timer->register_gc_start(); |
10405 | 569 DefNewTracer gc_tracer; |
570 gc_tracer.report_gc_start(gch->gc_cause(), _gc_timer->gc_start()); | |
571 | |
0 | 572 _next_gen = gch->next_gen(this); |
573 | |
10405 | 574 // If the next generation is too full to accommodate promotion |
0 | 575 // from this generation, pass on collection; let the next generation |
576 // do it. | |
577 if (!collection_attempt_is_safe()) { | |
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578 if (Verbose && PrintGCDetails) { |
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579 gclog_or_tty->print(" :: Collection attempt not safe :: "); |
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580 } |
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581 gch->set_incremental_collection_failed(); // Slight lie: we did not even attempt one |
0 | 582 return; |
583 } | |
584 assert(to()->is_empty(), "Else not collection_attempt_is_safe"); | |
585 | |
586 init_assuming_no_promotion_failure(); | |
587 | |
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588 GCTraceTime t1(GCCauseString("GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, NULL, gc_tracer.gc_id()); |
0 | 589 // Capture heap used before collection (for printing). |
590 size_t gch_prev_used = gch->used(); | |
591 | |
10405 | 592 gch->trace_heap_before_gc(&gc_tracer); |
593 | |
0 | 594 SpecializationStats::clear(); |
595 | |
596 // These can be shared for all code paths | |
597 IsAliveClosure is_alive(this); | |
598 ScanWeakRefClosure scan_weak_ref(this); | |
599 | |
600 age_table()->clear(); | |
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601 to()->clear(SpaceDecorator::Mangle); |
0 | 602 |
603 gch->rem_set()->prepare_for_younger_refs_iterate(false); | |
604 | |
605 assert(gch->no_allocs_since_save_marks(0), | |
606 "save marks have not been newly set."); | |
607 | |
608 // Not very pretty. | |
609 CollectorPolicy* cp = gch->collector_policy(); | |
610 | |
611 FastScanClosure fsc_with_no_gc_barrier(this, false); | |
612 FastScanClosure fsc_with_gc_barrier(this, true); | |
613 | |
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614 KlassScanClosure klass_scan_closure(&fsc_with_no_gc_barrier, |
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615 gch->rem_set()->klass_rem_set()); |
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616 CLDToKlassAndOopClosure cld_scan_closure(&klass_scan_closure, |
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617 &fsc_with_no_gc_barrier, |
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618 false); |
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619 |
0 | 620 set_promo_failure_scan_stack_closure(&fsc_with_no_gc_barrier); |
621 FastEvacuateFollowersClosure evacuate_followers(gch, _level, this, | |
622 &fsc_with_no_gc_barrier, | |
623 &fsc_with_gc_barrier); | |
624 | |
625 assert(gch->no_allocs_since_save_marks(0), | |
626 "save marks have not been newly set."); | |
627 | |
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628 gch->gen_process_roots(_level, |
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629 true, // Process younger gens, if any, |
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630 // as strong roots. |
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631 true, // activate StrongRootsScope |
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632 SharedHeap::SO_ScavengeCodeCache, |
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633 GenCollectedHeap::StrongAndWeakRoots, |
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634 &fsc_with_no_gc_barrier, |
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635 &fsc_with_gc_barrier, |
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636 &cld_scan_closure); |
0 | 637 |
638 // "evacuate followers". | |
639 evacuate_followers.do_void(); | |
640 | |
641 FastKeepAliveClosure keep_alive(this, &scan_weak_ref); | |
453
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642 ReferenceProcessor* rp = ref_processor(); |
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643 rp->setup_policy(clear_all_soft_refs); |
10405 | 644 const ReferenceProcessorStats& stats = |
453
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645 rp->process_discovered_references(&is_alive, &keep_alive, &evacuate_followers, |
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646 NULL, _gc_timer, gc_tracer.gc_id()); |
10405 | 647 gc_tracer.report_gc_reference_stats(stats); |
648 | |
649 if (!_promotion_failed) { | |
0 | 650 // Swap the survivor spaces. |
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651 eden()->clear(SpaceDecorator::Mangle); |
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652 from()->clear(SpaceDecorator::Mangle); |
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653 if (ZapUnusedHeapArea) { |
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654 // This is now done here because of the piece-meal mangling which |
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655 // can check for valid mangling at intermediate points in the |
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656 // collection(s). When a minor collection fails to collect |
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657 // sufficient space resizing of the young generation can occur |
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658 // an redistribute the spaces in the young generation. Mangle |
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659 // here so that unzapped regions don't get distributed to |
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660 // other spaces. |
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661 to()->mangle_unused_area(); |
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662 } |
0 | 663 swap_spaces(); |
664 | |
665 assert(to()->is_empty(), "to space should be empty now"); | |
666 | |
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667 adjust_desired_tenuring_threshold(); |
0 | 668 |
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669 // A successful scavenge should restart the GC time limit count which is |
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670 // for full GC's. |
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671 AdaptiveSizePolicy* size_policy = gch->gen_policy()->size_policy(); |
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672 size_policy->reset_gc_overhead_limit_count(); |
0 | 673 if (PrintGC && !PrintGCDetails) { |
674 gch->print_heap_change(gch_prev_used); | |
675 } | |
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676 assert(!gch->incremental_collection_failed(), "Should be clear"); |
0 | 677 } else { |
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678 assert(_promo_failure_scan_stack.is_empty(), "post condition"); |
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679 _promo_failure_scan_stack.clear(true); // Clear cached segments. |
0 | 680 |
681 remove_forwarding_pointers(); | |
682 if (PrintGCDetails) { | |
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683 gclog_or_tty->print(" (promotion failed) "); |
0 | 684 } |
685 // Add to-space to the list of space to compact | |
686 // when a promotion failure has occurred. In that | |
687 // case there can be live objects in to-space | |
688 // as a result of a partial evacuation of eden | |
689 // and from-space. | |
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690 swap_spaces(); // For uniformity wrt ParNewGeneration. |
0 | 691 from()->set_next_compaction_space(to()); |
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692 gch->set_incremental_collection_failed(); |
0 | 693 |
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694 // Inform the next generation that a promotion failure occurred. |
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695 _next_gen->promotion_failure_occurred(); |
10405 | 696 gc_tracer.report_promotion_failed(_promotion_failed_info); |
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697 |
0 | 698 // Reset the PromotionFailureALot counters. |
699 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
700 } | |
701 // set new iteration safe limit for the survivor spaces | |
702 from()->set_concurrent_iteration_safe_limit(from()->top()); | |
703 to()->set_concurrent_iteration_safe_limit(to()->top()); | |
704 SpecializationStats::print(); | |
4911 | 705 |
10405 | 706 // We need to use a monotonically non-decreasing time in ms |
4911 | 707 // or we will see time-warp warnings and os::javaTimeMillis() |
708 // does not guarantee monotonicity. | |
709 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; | |
710 update_time_of_last_gc(now); | |
10405 | 711 |
712 gch->trace_heap_after_gc(&gc_tracer); | |
713 gc_tracer.report_tenuring_threshold(tenuring_threshold()); | |
714 | |
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715 _gc_timer->register_gc_end(); |
10405 | 716 |
717 gc_tracer.report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions()); | |
0 | 718 } |
719 | |
720 class RemoveForwardPointerClosure: public ObjectClosure { | |
721 public: | |
722 void do_object(oop obj) { | |
723 obj->init_mark(); | |
724 } | |
725 }; | |
726 | |
727 void DefNewGeneration::init_assuming_no_promotion_failure() { | |
728 _promotion_failed = false; | |
10405 | 729 _promotion_failed_info.reset(); |
0 | 730 from()->set_next_compaction_space(NULL); |
731 } | |
732 | |
733 void DefNewGeneration::remove_forwarding_pointers() { | |
734 RemoveForwardPointerClosure rspc; | |
735 eden()->object_iterate(&rspc); | |
736 from()->object_iterate(&rspc); | |
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737 |
0 | 738 // Now restore saved marks, if any. |
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739 assert(_objs_with_preserved_marks.size() == _preserved_marks_of_objs.size(), |
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740 "should be the same"); |
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741 while (!_objs_with_preserved_marks.is_empty()) { |
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742 oop obj = _objs_with_preserved_marks.pop(); |
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743 markOop m = _preserved_marks_of_objs.pop(); |
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744 obj->set_mark(m); |
0 | 745 } |
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746 _objs_with_preserved_marks.clear(true); |
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747 _preserved_marks_of_objs.clear(true); |
0 | 748 } |
749 | |
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750 void DefNewGeneration::preserve_mark(oop obj, markOop m) { |
10405 | 751 assert(_promotion_failed && m->must_be_preserved_for_promotion_failure(obj), |
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752 "Oversaving!"); |
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753 _objs_with_preserved_marks.push(obj); |
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754 _preserved_marks_of_objs.push(m); |
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755 } |
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756 |
0 | 757 void DefNewGeneration::preserve_mark_if_necessary(oop obj, markOop m) { |
758 if (m->must_be_preserved_for_promotion_failure(obj)) { | |
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759 preserve_mark(obj, m); |
0 | 760 } |
761 } | |
762 | |
763 void DefNewGeneration::handle_promotion_failure(oop old) { | |
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764 if (PrintPromotionFailure && !_promotion_failed) { |
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765 gclog_or_tty->print(" (promotion failure size = " SIZE_FORMAT ") ", |
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766 old->size()); |
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767 } |
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768 _promotion_failed = true; |
10405 | 769 _promotion_failed_info.register_copy_failure(old->size()); |
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770 preserve_mark_if_necessary(old, old->mark()); |
0 | 771 // forward to self |
772 old->forward_to(old); | |
773 | |
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774 _promo_failure_scan_stack.push(old); |
0 | 775 |
776 if (!_promo_failure_drain_in_progress) { | |
777 // prevent recursion in copy_to_survivor_space() | |
778 _promo_failure_drain_in_progress = true; | |
779 drain_promo_failure_scan_stack(); | |
780 _promo_failure_drain_in_progress = false; | |
781 } | |
782 } | |
783 | |
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784 oop DefNewGeneration::copy_to_survivor_space(oop old) { |
0 | 785 assert(is_in_reserved(old) && !old->is_forwarded(), |
786 "shouldn't be scavenging this oop"); | |
787 size_t s = old->size(); | |
788 oop obj = NULL; | |
789 | |
790 // Try allocating obj in to-space (unless too old) | |
791 if (old->age() < tenuring_threshold()) { | |
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792 obj = (oop) to()->allocate_aligned(s); |
0 | 793 } |
794 | |
795 // Otherwise try allocating obj tenured | |
796 if (obj == NULL) { | |
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797 obj = _next_gen->promote(old, s); |
0 | 798 if (obj == NULL) { |
799 handle_promotion_failure(old); | |
800 return old; | |
801 } | |
802 } else { | |
803 // Prefetch beyond obj | |
804 const intx interval = PrefetchCopyIntervalInBytes; | |
805 Prefetch::write(obj, interval); | |
806 | |
807 // Copy obj | |
808 Copy::aligned_disjoint_words((HeapWord*)old, (HeapWord*)obj, s); | |
809 | |
810 // Increment age if obj still in new generation | |
811 obj->incr_age(); | |
812 age_table()->add(obj, s); | |
813 } | |
814 | |
815 // Done, insert forward pointer to obj in this header | |
816 old->forward_to(obj); | |
817 | |
818 return obj; | |
819 } | |
820 | |
821 void DefNewGeneration::drain_promo_failure_scan_stack() { | |
1836
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822 while (!_promo_failure_scan_stack.is_empty()) { |
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823 oop obj = _promo_failure_scan_stack.pop(); |
0 | 824 obj->oop_iterate(_promo_failure_scan_stack_closure); |
825 } | |
826 } | |
827 | |
828 void DefNewGeneration::save_marks() { | |
829 eden()->set_saved_mark(); | |
830 to()->set_saved_mark(); | |
831 from()->set_saved_mark(); | |
832 } | |
833 | |
834 | |
835 void DefNewGeneration::reset_saved_marks() { | |
836 eden()->reset_saved_mark(); | |
837 to()->reset_saved_mark(); | |
838 from()->reset_saved_mark(); | |
839 } | |
840 | |
841 | |
842 bool DefNewGeneration::no_allocs_since_save_marks() { | |
843 assert(eden()->saved_mark_at_top(), "Violated spec - alloc in eden"); | |
844 assert(from()->saved_mark_at_top(), "Violated spec - alloc in from"); | |
845 return to()->saved_mark_at_top(); | |
846 } | |
847 | |
848 #define DefNew_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
849 \ | |
850 void DefNewGeneration:: \ | |
851 oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
852 cl->set_generation(this); \ | |
853 eden()->oop_since_save_marks_iterate##nv_suffix(cl); \ | |
854 to()->oop_since_save_marks_iterate##nv_suffix(cl); \ | |
855 from()->oop_since_save_marks_iterate##nv_suffix(cl); \ | |
856 cl->reset_generation(); \ | |
857 save_marks(); \ | |
858 } | |
859 | |
860 ALL_SINCE_SAVE_MARKS_CLOSURES(DefNew_SINCE_SAVE_MARKS_DEFN) | |
861 | |
862 #undef DefNew_SINCE_SAVE_MARKS_DEFN | |
863 | |
864 void DefNewGeneration::contribute_scratch(ScratchBlock*& list, Generation* requestor, | |
865 size_t max_alloc_words) { | |
866 if (requestor == this || _promotion_failed) return; | |
867 assert(requestor->level() > level(), "DefNewGeneration must be youngest"); | |
868 | |
869 /* $$$ Assert this? "trace" is a "MarkSweep" function so that's not appropriate. | |
870 if (to_space->top() > to_space->bottom()) { | |
871 trace("to_space not empty when contribute_scratch called"); | |
872 } | |
873 */ | |
874 | |
875 ContiguousSpace* to_space = to(); | |
876 assert(to_space->end() >= to_space->top(), "pointers out of order"); | |
877 size_t free_words = pointer_delta(to_space->end(), to_space->top()); | |
878 if (free_words >= MinFreeScratchWords) { | |
879 ScratchBlock* sb = (ScratchBlock*)to_space->top(); | |
880 sb->num_words = free_words; | |
881 sb->next = list; | |
882 list = sb; | |
883 } | |
884 } | |
885 | |
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886 void DefNewGeneration::reset_scratch() { |
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887 // If contributing scratch in to_space, mangle all of |
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888 // to_space if ZapUnusedHeapArea. This is needed because |
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889 // top is not maintained while using to-space as scratch. |
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890 if (ZapUnusedHeapArea) { |
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891 to()->mangle_unused_area_complete(); |
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892 } |
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893 } |
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894 |
0 | 895 bool DefNewGeneration::collection_attempt_is_safe() { |
896 if (!to()->is_empty()) { | |
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897 if (Verbose && PrintGCDetails) { |
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898 gclog_or_tty->print(" :: to is not empty :: "); |
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899 } |
0 | 900 return false; |
901 } | |
902 if (_next_gen == NULL) { | |
903 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
904 _next_gen = gch->next_gen(this); | |
905 } | |
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906 return _next_gen->promotion_attempt_is_safe(used()); |
0 | 907 } |
908 | |
909 void DefNewGeneration::gc_epilogue(bool full) { | |
1889
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910 DEBUG_ONLY(static bool seen_incremental_collection_failed = false;) |
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911 |
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912 assert(!GC_locker::is_active(), "We should not be executing here"); |
0 | 913 // Check if the heap is approaching full after a collection has |
914 // been done. Generally the young generation is empty at | |
915 // a minimum at the end of a collection. If it is not, then | |
916 // the heap is approaching full. | |
917 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
1888
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918 if (full) { |
1889
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919 DEBUG_ONLY(seen_incremental_collection_failed = false;) |
1994
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920 if (!collection_attempt_is_safe() && !_eden_space->is_empty()) { |
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921 if (Verbose && PrintGCDetails) { |
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922 gclog_or_tty->print("DefNewEpilogue: cause(%s), full, not safe, set_failed, set_alloc_from, clear_seen", |
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923 GCCause::to_string(gch->gc_cause())); |
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924 } |
1888
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925 gch->set_incremental_collection_failed(); // Slight lie: a full gc left us in that state |
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926 set_should_allocate_from_space(); // we seem to be running out of space |
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927 } else { |
1994
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928 if (Verbose && PrintGCDetails) { |
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929 gclog_or_tty->print("DefNewEpilogue: cause(%s), full, safe, clear_failed, clear_alloc_from, clear_seen", |
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930 GCCause::to_string(gch->gc_cause())); |
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931 } |
1888
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932 gch->clear_incremental_collection_failed(); // We just did a full collection |
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933 clear_should_allocate_from_space(); // if set |
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934 } |
0 | 935 } else { |
1889
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936 #ifdef ASSERT |
c766bae6c14d
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937 // It is possible that incremental_collection_failed() == true |
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938 // here, because an attempted scavenge did not succeed. The policy |
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939 // is normally expected to cause a full collection which should |
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940 // clear that condition, so we should not be here twice in a row |
c766bae6c14d
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941 // with incremental_collection_failed() == true without having done |
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942 // a full collection in between. |
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6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
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943 if (!seen_incremental_collection_failed && |
c766bae6c14d
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
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944 gch->incremental_collection_failed()) { |
1994
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|
945 if (Verbose && PrintGCDetails) { |
6cd6d394f280
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946 gclog_or_tty->print("DefNewEpilogue: cause(%s), not full, not_seen_failed, failed, set_seen_failed", |
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947 GCCause::to_string(gch->gc_cause())); |
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|
948 } |
1889
c766bae6c14d
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
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|
949 seen_incremental_collection_failed = true; |
c766bae6c14d
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
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950 } else if (seen_incremental_collection_failed) { |
1994
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|
951 if (Verbose && PrintGCDetails) { |
6cd6d394f280
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952 gclog_or_tty->print("DefNewEpilogue: cause(%s), not full, seen_failed, will_clear_seen_failed", |
6cd6d394f280
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953 GCCause::to_string(gch->gc_cause())); |
6cd6d394f280
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954 } |
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955 assert(gch->gc_cause() == GCCause::_scavenge_alot || |
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956 (gch->gc_cause() == GCCause::_java_lang_system_gc && UseConcMarkSweepGC && ExplicitGCInvokesConcurrent) || |
6cd6d394f280
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957 !gch->incremental_collection_failed(), |
1953
8d81b4a1d3e1
6998802: ScavengeALot: assert(!gch->incremental_collection_failed()) failed: Twice in a row
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958 "Twice in a row"); |
1889
c766bae6c14d
6995045: assert(!gch->incremental_collection_failed()) failed: Error, defNewGeneration.cpp:827
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959 seen_incremental_collection_failed = false; |
c766bae6c14d
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960 } |
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961 #endif // ASSERT |
0 | 962 } |
963 | |
263
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964 if (ZapUnusedHeapArea) { |
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965 eden()->check_mangled_unused_area_complete(); |
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966 from()->check_mangled_unused_area_complete(); |
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967 to()->check_mangled_unused_area_complete(); |
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968 } |
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969 |
3799
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970 if (!CleanChunkPoolAsync) { |
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971 Chunk::clean_chunk_pool(); |
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972 } |
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973 |
0 | 974 // update the generation and space performance counters |
975 update_counters(); | |
976 gch->collector_policy()->counters()->update_counters(); | |
977 } | |
978 | |
263
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979 void DefNewGeneration::record_spaces_top() { |
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980 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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981 eden()->set_top_for_allocations(); |
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982 to()->set_top_for_allocations(); |
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983 from()->set_top_for_allocations(); |
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984 } |
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985 |
10405 | 986 void DefNewGeneration::ref_processor_init() { |
987 Generation::ref_processor_init(); | |
988 } | |
989 | |
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990 |
0 | 991 void DefNewGeneration::update_counters() { |
992 if (UsePerfData) { | |
993 _eden_counters->update_all(); | |
994 _from_counters->update_all(); | |
995 _to_counters->update_all(); | |
996 _gen_counters->update_all(); | |
997 } | |
998 } | |
999 | |
6008 | 1000 void DefNewGeneration::verify() { |
1001 eden()->verify(); | |
1002 from()->verify(); | |
1003 to()->verify(); | |
0 | 1004 } |
1005 | |
1006 void DefNewGeneration::print_on(outputStream* st) const { | |
1007 Generation::print_on(st); | |
1008 st->print(" eden"); | |
1009 eden()->print_on(st); | |
1010 st->print(" from"); | |
1011 from()->print_on(st); | |
1012 st->print(" to "); | |
1013 to()->print_on(st); | |
1014 } | |
1015 | |
1016 | |
1017 const char* DefNewGeneration::name() const { | |
1018 return "def new generation"; | |
1019 } | |
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1020 |
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1021 // Moved from inline file as they are not called inline |
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1022 CompactibleSpace* DefNewGeneration::first_compaction_space() const { |
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1023 return eden(); |
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1024 } |
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1025 |
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1026 HeapWord* DefNewGeneration::allocate(size_t word_size, |
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1027 bool is_tlab) { |
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1028 // This is the slow-path allocation for the DefNewGeneration. |
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1029 // Most allocations are fast-path in compiled code. |
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1030 // We try to allocate from the eden. If that works, we are happy. |
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1031 // Note that since DefNewGeneration supports lock-free allocation, we |
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1032 // have to use it here, as well. |
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1033 HeapWord* result = eden()->par_allocate(word_size); |
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1034 if (result != NULL) { |
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1035 if (CMSEdenChunksRecordAlways && _next_gen != NULL) { |
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1036 _next_gen->sample_eden_chunk(); |
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1037 } |
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1038 return result; |
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1039 } |
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1040 do { |
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1041 HeapWord* old_limit = eden()->soft_end(); |
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1042 if (old_limit < eden()->end()) { |
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1043 // Tell the next generation we reached a limit. |
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1044 HeapWord* new_limit = |
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1045 next_gen()->allocation_limit_reached(eden(), eden()->top(), word_size); |
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1046 if (new_limit != NULL) { |
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1047 Atomic::cmpxchg_ptr(new_limit, eden()->soft_end_addr(), old_limit); |
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1048 } else { |
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1049 assert(eden()->soft_end() == eden()->end(), |
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1050 "invalid state after allocation_limit_reached returned null"); |
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1051 } |
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1052 } else { |
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1053 // The allocation failed and the soft limit is equal to the hard limit, |
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1054 // there are no reasons to do an attempt to allocate |
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1055 assert(old_limit == eden()->end(), "sanity check"); |
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1056 break; |
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1057 } |
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1058 // Try to allocate until succeeded or the soft limit can't be adjusted |
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1059 result = eden()->par_allocate(word_size); |
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1060 } while (result == NULL); |
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1061 |
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1062 // If the eden is full and the last collection bailed out, we are running |
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1063 // out of heap space, and we try to allocate the from-space, too. |
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1064 // allocate_from_space can't be inlined because that would introduce a |
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1065 // circular dependency at compile time. |
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1066 if (result == NULL) { |
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1067 result = allocate_from_space(word_size); |
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1068 } else if (CMSEdenChunksRecordAlways && _next_gen != NULL) { |
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1069 _next_gen->sample_eden_chunk(); |
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1070 } |
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1071 return result; |
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1072 } |
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1073 |
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1074 HeapWord* DefNewGeneration::par_allocate(size_t word_size, |
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1075 bool is_tlab) { |
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1076 HeapWord* res = eden()->par_allocate(word_size); |
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1077 if (CMSEdenChunksRecordAlways && _next_gen != NULL) { |
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1078 _next_gen->sample_eden_chunk(); |
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1079 } |
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1080 return res; |
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1081 } |
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1082 |
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1083 void DefNewGeneration::gc_prologue(bool full) { |
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1084 // Ensure that _end and _soft_end are the same in eden space. |
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1085 eden()->set_soft_end(eden()->end()); |
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1086 } |
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1087 |
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1088 size_t DefNewGeneration::tlab_capacity() const { |
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1089 return eden()->capacity(); |
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1090 } |
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1091 |
17727 | 1092 size_t DefNewGeneration::tlab_used() const { |
1093 return eden()->used(); | |
1094 } | |
1095 | |
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1096 size_t DefNewGeneration::unsafe_max_tlab_alloc() const { |
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1097 return unsafe_max_alloc_nogc(); |
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1098 } |