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annotate src/share/vm/memory/defNewGeneration.cpp @ 7816:4e1278443941
Remove Kind.Jsr.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 18 Feb 2013 20:55:18 -0800 |
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0 | 1 /* |
4911 | 2 * Copyright (c) 2001, 2012, 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" | |
28 #include "gc_implementation/shared/spaceDecorator.hpp" | |
29 #include "memory/defNewGeneration.inline.hpp" | |
30 #include "memory/gcLocker.inline.hpp" | |
31 #include "memory/genCollectedHeap.hpp" | |
32 #include "memory/genOopClosures.inline.hpp" | |
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33 #include "memory/genRemSet.hpp" |
1972 | 34 #include "memory/generationSpec.hpp" |
35 #include "memory/iterator.hpp" | |
36 #include "memory/referencePolicy.hpp" | |
37 #include "memory/space.inline.hpp" | |
38 #include "oops/instanceRefKlass.hpp" | |
39 #include "oops/oop.inline.hpp" | |
40 #include "runtime/java.hpp" | |
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41 #include "runtime/thread.inline.hpp" |
1972 | 42 #include "utilities/copy.hpp" |
43 #include "utilities/stack.inline.hpp" | |
0 | 44 |
45 // | |
46 // DefNewGeneration functions. | |
47 | |
48 // Methods of protected closure types. | |
49 | |
50 DefNewGeneration::IsAliveClosure::IsAliveClosure(Generation* g) : _g(g) { | |
51 assert(g->level() == 0, "Optimized for youngest gen."); | |
52 } | |
53 void DefNewGeneration::IsAliveClosure::do_object(oop p) { | |
54 assert(false, "Do not call."); | |
55 } | |
56 bool DefNewGeneration::IsAliveClosure::do_object_b(oop p) { | |
57 return (HeapWord*)p >= _g->reserved().end() || p->is_forwarded(); | |
58 } | |
59 | |
60 DefNewGeneration::KeepAliveClosure:: | |
61 KeepAliveClosure(ScanWeakRefClosure* cl) : _cl(cl) { | |
62 GenRemSet* rs = GenCollectedHeap::heap()->rem_set(); | |
63 assert(rs->rs_kind() == GenRemSet::CardTable, "Wrong rem set kind."); | |
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 | |
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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. | |
206 uintx alignment = GenCollectedHeap::heap()->collector_policy()->min_alignment(); | |
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; | |
229 } | |
230 | |
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231 void DefNewGeneration::compute_space_boundaries(uintx minimum_eden_size, |
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232 bool clear_space, |
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233 bool mangle_space) { |
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234 uintx alignment = |
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235 GenCollectedHeap::heap()->collector_policy()->min_alignment(); |
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236 |
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237 // If the spaces are being cleared (only done at heap initialization |
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238 // currently), the survivor spaces need not be empty. |
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239 // Otherwise, no care is taken for used areas in the survivor spaces |
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240 // so check. |
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241 assert(clear_space || (to()->is_empty() && from()->is_empty()), |
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242 "Initialization of the survivor spaces assumes these are empty"); |
0 | 243 |
244 // Compute sizes | |
245 uintx size = _virtual_space.committed_size(); | |
246 uintx survivor_size = compute_survivor_size(size, alignment); | |
247 uintx eden_size = size - (2*survivor_size); | |
248 assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); | |
249 | |
250 if (eden_size < minimum_eden_size) { | |
251 // May happen due to 64Kb rounding, if so adjust eden size back up | |
252 minimum_eden_size = align_size_up(minimum_eden_size, alignment); | |
253 uintx maximum_survivor_size = (size - minimum_eden_size) / 2; | |
254 uintx unaligned_survivor_size = | |
255 align_size_down(maximum_survivor_size, alignment); | |
256 survivor_size = MAX2(unaligned_survivor_size, alignment); | |
257 eden_size = size - (2*survivor_size); | |
258 assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); | |
259 assert(eden_size >= minimum_eden_size, "just checking"); | |
260 } | |
261 | |
262 char *eden_start = _virtual_space.low(); | |
263 char *from_start = eden_start + eden_size; | |
264 char *to_start = from_start + survivor_size; | |
265 char *to_end = to_start + survivor_size; | |
266 | |
267 assert(to_end == _virtual_space.high(), "just checking"); | |
268 assert(Space::is_aligned((HeapWord*)eden_start), "checking alignment"); | |
269 assert(Space::is_aligned((HeapWord*)from_start), "checking alignment"); | |
270 assert(Space::is_aligned((HeapWord*)to_start), "checking alignment"); | |
271 | |
272 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)from_start); | |
273 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)to_start); | |
274 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
275 | |
263
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276 // A minimum eden size implies that there is a part of eden that |
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277 // is being used and that affects the initialization of any |
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278 // newly formed eden. |
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279 bool live_in_eden = minimum_eden_size > 0; |
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280 |
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281 // If not clearing the spaces, do some checking to verify that |
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282 // the space are already mangled. |
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283 if (!clear_space) { |
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284 // Must check mangling before the spaces are reshaped. Otherwise, |
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285 // the bottom or end of one space may have moved into another |
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286 // a failure of the check may not correctly indicate which space |
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287 // is not properly mangled. |
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288 if (ZapUnusedHeapArea) { |
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289 HeapWord* limit = (HeapWord*) _virtual_space.high(); |
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290 eden()->check_mangled_unused_area(limit); |
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291 from()->check_mangled_unused_area(limit); |
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292 to()->check_mangled_unused_area(limit); |
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293 } |
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294 } |
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295 |
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296 // Reset the spaces for their new regions. |
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297 eden()->initialize(edenMR, |
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298 clear_space && !live_in_eden, |
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299 SpaceDecorator::Mangle); |
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300 // If clear_space and live_in_eden, we will not have cleared any |
0 | 301 // portion of eden above its top. This can cause newly |
302 // expanded space not to be mangled if using ZapUnusedHeapArea. | |
303 // We explicitly do such mangling here. | |
263
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304 if (ZapUnusedHeapArea && clear_space && live_in_eden && mangle_space) { |
0 | 305 eden()->mangle_unused_area(); |
306 } | |
263
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307 from()->initialize(fromMR, clear_space, mangle_space); |
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308 to()->initialize(toMR, clear_space, mangle_space); |
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309 |
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310 // Set next compaction spaces. |
0 | 311 eden()->set_next_compaction_space(from()); |
312 // The to-space is normally empty before a compaction so need | |
313 // not be considered. The exception is during promotion | |
314 // failure handling when to-space can contain live objects. | |
315 from()->set_next_compaction_space(NULL); | |
316 } | |
317 | |
318 void DefNewGeneration::swap_spaces() { | |
319 ContiguousSpace* s = from(); | |
320 _from_space = to(); | |
321 _to_space = s; | |
322 eden()->set_next_compaction_space(from()); | |
323 // The to-space is normally empty before a compaction so need | |
324 // not be considered. The exception is during promotion | |
325 // failure handling when to-space can contain live objects. | |
326 from()->set_next_compaction_space(NULL); | |
327 | |
328 if (UsePerfData) { | |
329 CSpaceCounters* c = _from_counters; | |
330 _from_counters = _to_counters; | |
331 _to_counters = c; | |
332 } | |
333 } | |
334 | |
335 bool DefNewGeneration::expand(size_t bytes) { | |
336 MutexLocker x(ExpandHeap_lock); | |
263
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337 HeapWord* prev_high = (HeapWord*) _virtual_space.high(); |
0 | 338 bool success = _virtual_space.expand_by(bytes); |
263
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339 if (success && ZapUnusedHeapArea) { |
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340 // Mangle newly committed space immediately because it |
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341 // can be done here more simply that after the new |
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342 // spaces have been computed. |
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343 HeapWord* new_high = (HeapWord*) _virtual_space.high(); |
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344 MemRegion mangle_region(prev_high, new_high); |
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345 SpaceMangler::mangle_region(mangle_region); |
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346 } |
0 | 347 |
348 // Do not attempt an expand-to-the reserve size. The | |
349 // request should properly observe the maximum size of | |
350 // the generation so an expand-to-reserve should be | |
351 // unnecessary. Also a second call to expand-to-reserve | |
352 // value potentially can cause an undue expansion. | |
353 // For example if the first expand fail for unknown reasons, | |
354 // but the second succeeds and expands the heap to its maximum | |
355 // value. | |
356 if (GC_locker::is_active()) { | |
357 if (PrintGC && Verbose) { | |
263
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358 gclog_or_tty->print_cr("Garbage collection disabled, " |
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359 "expanded heap instead"); |
0 | 360 } |
361 } | |
362 | |
363 return success; | |
364 } | |
365 | |
366 | |
367 void DefNewGeneration::compute_new_size() { | |
368 // This is called after a gc that includes the following generation | |
369 // (which is required to exist.) So from-space will normally be empty. | |
370 // Note that we check both spaces, since if scavenge failed they revert roles. | |
371 // If not we bail out (otherwise we would have to relocate the objects) | |
372 if (!from()->is_empty() || !to()->is_empty()) { | |
373 return; | |
374 } | |
375 | |
376 int next_level = level() + 1; | |
377 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
378 assert(next_level < gch->_n_gens, | |
379 "DefNewGeneration cannot be an oldest gen"); | |
380 | |
381 Generation* next_gen = gch->_gens[next_level]; | |
382 size_t old_size = next_gen->capacity(); | |
383 size_t new_size_before = _virtual_space.committed_size(); | |
384 size_t min_new_size = spec()->init_size(); | |
385 size_t max_new_size = reserved().byte_size(); | |
386 assert(min_new_size <= new_size_before && | |
387 new_size_before <= max_new_size, | |
388 "just checking"); | |
389 // All space sizes must be multiples of Generation::GenGrain. | |
390 size_t alignment = Generation::GenGrain; | |
391 | |
392 // Compute desired new generation size based on NewRatio and | |
393 // NewSizeThreadIncrease | |
394 size_t desired_new_size = old_size/NewRatio; | |
395 int threads_count = Threads::number_of_non_daemon_threads(); | |
396 size_t thread_increase_size = threads_count * NewSizeThreadIncrease; | |
397 desired_new_size = align_size_up(desired_new_size + thread_increase_size, alignment); | |
398 | |
399 // Adjust new generation size | |
400 desired_new_size = MAX2(MIN2(desired_new_size, max_new_size), min_new_size); | |
401 assert(desired_new_size <= max_new_size, "just checking"); | |
402 | |
403 bool changed = false; | |
404 if (desired_new_size > new_size_before) { | |
405 size_t change = desired_new_size - new_size_before; | |
406 assert(change % alignment == 0, "just checking"); | |
407 if (expand(change)) { | |
408 changed = true; | |
409 } | |
410 // If the heap failed to expand to the desired size, | |
411 // "changed" will be false. If the expansion failed | |
412 // (and at this point it was expected to succeed), | |
413 // ignore the failure (leaving "changed" as false). | |
414 } | |
415 if (desired_new_size < new_size_before && eden()->is_empty()) { | |
416 // bail out of shrinking if objects in eden | |
417 size_t change = new_size_before - desired_new_size; | |
418 assert(change % alignment == 0, "just checking"); | |
419 _virtual_space.shrink_by(change); | |
420 changed = true; | |
421 } | |
422 if (changed) { | |
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423 // The spaces have already been mangled at this point but |
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424 // may not have been cleared (set top = bottom) and should be. |
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425 // Mangling was done when the heap was being expanded. |
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426 compute_space_boundaries(eden()->used(), |
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427 SpaceDecorator::Clear, |
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428 SpaceDecorator::DontMangle); |
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429 MemRegion cmr((HeapWord*)_virtual_space.low(), |
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430 (HeapWord*)_virtual_space.high()); |
0 | 431 Universe::heap()->barrier_set()->resize_covered_region(cmr); |
432 if (Verbose && PrintGC) { | |
433 size_t new_size_after = _virtual_space.committed_size(); | |
434 size_t eden_size_after = eden()->capacity(); | |
435 size_t survivor_size_after = from()->capacity(); | |
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436 gclog_or_tty->print("New generation size " SIZE_FORMAT "K->" |
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437 SIZE_FORMAT "K [eden=" |
0 | 438 SIZE_FORMAT "K,survivor=" SIZE_FORMAT "K]", |
263
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439 new_size_before/K, new_size_after/K, |
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440 eden_size_after/K, survivor_size_after/K); |
0 | 441 if (WizardMode) { |
442 gclog_or_tty->print("[allowed " SIZE_FORMAT "K extra for %d threads]", | |
443 thread_increase_size/K, threads_count); | |
444 } | |
445 gclog_or_tty->cr(); | |
446 } | |
447 } | |
448 } | |
449 | |
450 void DefNewGeneration::object_iterate_since_last_GC(ObjectClosure* cl) { | |
451 // $$$ This may be wrong in case of "scavenge failure"? | |
452 eden()->object_iterate(cl); | |
453 } | |
454 | |
455 void DefNewGeneration::younger_refs_iterate(OopsInGenClosure* cl) { | |
456 assert(false, "NYI -- are you sure you want to call this?"); | |
457 } | |
458 | |
459 | |
460 size_t DefNewGeneration::capacity() const { | |
461 return eden()->capacity() | |
462 + from()->capacity(); // to() is only used during scavenge | |
463 } | |
464 | |
465 | |
466 size_t DefNewGeneration::used() const { | |
467 return eden()->used() | |
468 + from()->used(); // to() is only used during scavenge | |
469 } | |
470 | |
471 | |
472 size_t DefNewGeneration::free() const { | |
473 return eden()->free() | |
474 + from()->free(); // to() is only used during scavenge | |
475 } | |
476 | |
477 size_t DefNewGeneration::max_capacity() const { | |
478 const size_t alignment = GenCollectedHeap::heap()->collector_policy()->min_alignment(); | |
479 const size_t reserved_bytes = reserved().byte_size(); | |
480 return reserved_bytes - compute_survivor_size(reserved_bytes, alignment); | |
481 } | |
482 | |
483 size_t DefNewGeneration::unsafe_max_alloc_nogc() const { | |
484 return eden()->free(); | |
485 } | |
486 | |
487 size_t DefNewGeneration::capacity_before_gc() const { | |
488 return eden()->capacity(); | |
489 } | |
490 | |
491 size_t DefNewGeneration::contiguous_available() const { | |
492 return eden()->free(); | |
493 } | |
494 | |
495 | |
496 HeapWord** DefNewGeneration::top_addr() const { return eden()->top_addr(); } | |
497 HeapWord** DefNewGeneration::end_addr() const { return eden()->end_addr(); } | |
498 | |
499 void DefNewGeneration::object_iterate(ObjectClosure* blk) { | |
500 eden()->object_iterate(blk); | |
501 from()->object_iterate(blk); | |
502 } | |
503 | |
504 | |
505 void DefNewGeneration::space_iterate(SpaceClosure* blk, | |
506 bool usedOnly) { | |
507 blk->do_space(eden()); | |
508 blk->do_space(from()); | |
509 blk->do_space(to()); | |
510 } | |
511 | |
512 // The last collection bailed out, we are running out of heap space, | |
513 // so we try to allocate the from-space, too. | |
514 HeapWord* DefNewGeneration::allocate_from_space(size_t size) { | |
515 HeapWord* result = NULL; | |
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516 if (Verbose && PrintGCDetails) { |
0 | 517 gclog_or_tty->print("DefNewGeneration::allocate_from_space(%u):" |
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518 " will_fail: %s" |
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519 " heap_lock: %s" |
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520 " free: " SIZE_FORMAT, |
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521 size, |
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522 GenCollectedHeap::heap()->incremental_collection_will_fail(false /* don't consult_young */) ? |
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523 "true" : "false", |
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524 Heap_lock->is_locked() ? "locked" : "unlocked", |
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525 from()->free()); |
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526 } |
0 | 527 if (should_allocate_from_space() || GC_locker::is_active_and_needs_gc()) { |
528 if (Heap_lock->owned_by_self() || | |
529 (SafepointSynchronize::is_at_safepoint() && | |
530 Thread::current()->is_VM_thread())) { | |
531 // If the Heap_lock is not locked by this thread, this will be called | |
532 // again later with the Heap_lock held. | |
533 result = from()->allocate(size); | |
534 } else if (PrintGC && Verbose) { | |
535 gclog_or_tty->print_cr(" Heap_lock is not owned by self"); | |
536 } | |
537 } else if (PrintGC && Verbose) { | |
538 gclog_or_tty->print_cr(" should_allocate_from_space: NOT"); | |
539 } | |
540 if (PrintGC && Verbose) { | |
541 gclog_or_tty->print_cr(" returns %s", result == NULL ? "NULL" : "object"); | |
542 } | |
543 return result; | |
544 } | |
545 | |
546 HeapWord* DefNewGeneration::expand_and_allocate(size_t size, | |
547 bool is_tlab, | |
548 bool parallel) { | |
549 // We don't attempt to expand the young generation (but perhaps we should.) | |
550 return allocate(size, is_tlab); | |
551 } | |
552 | |
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553 void DefNewGeneration::adjust_desired_tenuring_threshold() { |
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554 // Set the desired survivor size to half the real survivor space |
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555 _tenuring_threshold = |
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556 age_table()->compute_tenuring_threshold(to()->capacity()/HeapWordSize); |
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557 } |
0 | 558 |
559 void DefNewGeneration::collect(bool full, | |
560 bool clear_all_soft_refs, | |
561 size_t size, | |
562 bool is_tlab) { | |
563 assert(full || size > 0, "otherwise we don't want to collect"); | |
564 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
565 _next_gen = gch->next_gen(this); | |
566 assert(_next_gen != NULL, | |
567 "This must be the youngest gen, and not the only gen"); | |
568 | |
569 // If the next generation is too full to accomodate promotion | |
570 // from this generation, pass on collection; let the next generation | |
571 // do it. | |
572 if (!collection_attempt_is_safe()) { | |
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573 if (Verbose && PrintGCDetails) { |
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574 gclog_or_tty->print(" :: Collection attempt not safe :: "); |
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575 } |
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576 gch->set_incremental_collection_failed(); // Slight lie: we did not even attempt one |
0 | 577 return; |
578 } | |
579 assert(to()->is_empty(), "Else not collection_attempt_is_safe"); | |
580 | |
581 init_assuming_no_promotion_failure(); | |
582 | |
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583 TraceTime t1(GCCauseString("GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, gclog_or_tty); |
0 | 584 // Capture heap used before collection (for printing). |
585 size_t gch_prev_used = gch->used(); | |
586 | |
587 SpecializationStats::clear(); | |
588 | |
589 // These can be shared for all code paths | |
590 IsAliveClosure is_alive(this); | |
591 ScanWeakRefClosure scan_weak_ref(this); | |
592 | |
593 age_table()->clear(); | |
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594 to()->clear(SpaceDecorator::Mangle); |
0 | 595 |
596 gch->rem_set()->prepare_for_younger_refs_iterate(false); | |
597 | |
598 assert(gch->no_allocs_since_save_marks(0), | |
599 "save marks have not been newly set."); | |
600 | |
601 // Not very pretty. | |
602 CollectorPolicy* cp = gch->collector_policy(); | |
603 | |
604 FastScanClosure fsc_with_no_gc_barrier(this, false); | |
605 FastScanClosure fsc_with_gc_barrier(this, true); | |
606 | |
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607 KlassScanClosure klass_scan_closure(&fsc_with_no_gc_barrier, |
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608 gch->rem_set()->klass_rem_set()); |
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609 |
0 | 610 set_promo_failure_scan_stack_closure(&fsc_with_no_gc_barrier); |
611 FastEvacuateFollowersClosure evacuate_followers(gch, _level, this, | |
612 &fsc_with_no_gc_barrier, | |
613 &fsc_with_gc_barrier); | |
614 | |
615 assert(gch->no_allocs_since_save_marks(0), | |
616 "save marks have not been newly set."); | |
617 | |
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618 int so = SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_CodeCache; |
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619 |
0 | 620 gch->gen_process_strong_roots(_level, |
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621 true, // Process younger gens, if any, |
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622 // as strong roots. |
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623 true, // activate StrongRootsScope |
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624 true, // is scavenging |
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625 SharedHeap::ScanningOption(so), |
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626 &fsc_with_no_gc_barrier, |
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627 true, // walk *all* scavengable nmethods |
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628 &fsc_with_gc_barrier, |
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629 &klass_scan_closure); |
0 | 630 |
631 // "evacuate followers". | |
632 evacuate_followers.do_void(); | |
633 | |
634 FastKeepAliveClosure keep_alive(this, &scan_weak_ref); | |
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635 ReferenceProcessor* rp = ref_processor(); |
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636 rp->setup_policy(clear_all_soft_refs); |
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637 rp->process_discovered_references(&is_alive, &keep_alive, &evacuate_followers, |
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638 NULL); |
0 | 639 if (!promotion_failed()) { |
640 // Swap the survivor spaces. | |
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641 eden()->clear(SpaceDecorator::Mangle); |
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642 from()->clear(SpaceDecorator::Mangle); |
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643 if (ZapUnusedHeapArea) { |
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644 // This is now done here because of the piece-meal mangling which |
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645 // can check for valid mangling at intermediate points in the |
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646 // collection(s). When a minor collection fails to collect |
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647 // sufficient space resizing of the young generation can occur |
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648 // an redistribute the spaces in the young generation. Mangle |
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649 // here so that unzapped regions don't get distributed to |
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650 // other spaces. |
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651 to()->mangle_unused_area(); |
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652 } |
0 | 653 swap_spaces(); |
654 | |
655 assert(to()->is_empty(), "to space should be empty now"); | |
656 | |
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657 adjust_desired_tenuring_threshold(); |
0 | 658 |
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659 // A successful scavenge should restart the GC time limit count which is |
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660 // for full GC's. |
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661 AdaptiveSizePolicy* size_policy = gch->gen_policy()->size_policy(); |
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662 size_policy->reset_gc_overhead_limit_count(); |
0 | 663 if (PrintGC && !PrintGCDetails) { |
664 gch->print_heap_change(gch_prev_used); | |
665 } | |
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666 assert(!gch->incremental_collection_failed(), "Should be clear"); |
0 | 667 } else { |
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668 assert(_promo_failure_scan_stack.is_empty(), "post condition"); |
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669 _promo_failure_scan_stack.clear(true); // Clear cached segments. |
0 | 670 |
671 remove_forwarding_pointers(); | |
672 if (PrintGCDetails) { | |
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673 gclog_or_tty->print(" (promotion failed) "); |
0 | 674 } |
675 // Add to-space to the list of space to compact | |
676 // when a promotion failure has occurred. In that | |
677 // case there can be live objects in to-space | |
678 // as a result of a partial evacuation of eden | |
679 // and from-space. | |
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680 swap_spaces(); // For uniformity wrt ParNewGeneration. |
0 | 681 from()->set_next_compaction_space(to()); |
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682 gch->set_incremental_collection_failed(); |
0 | 683 |
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684 // Inform the next generation that a promotion failure occurred. |
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685 _next_gen->promotion_failure_occurred(); |
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686 |
0 | 687 // Reset the PromotionFailureALot counters. |
688 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
689 } | |
690 // set new iteration safe limit for the survivor spaces | |
691 from()->set_concurrent_iteration_safe_limit(from()->top()); | |
692 to()->set_concurrent_iteration_safe_limit(to()->top()); | |
693 SpecializationStats::print(); | |
4911 | 694 |
695 // We need to use a monotonically non-deccreasing time in ms | |
696 // or we will see time-warp warnings and os::javaTimeMillis() | |
697 // does not guarantee monotonicity. | |
698 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; | |
699 update_time_of_last_gc(now); | |
0 | 700 } |
701 | |
702 class RemoveForwardPointerClosure: public ObjectClosure { | |
703 public: | |
704 void do_object(oop obj) { | |
705 obj->init_mark(); | |
706 } | |
707 }; | |
708 | |
709 void DefNewGeneration::init_assuming_no_promotion_failure() { | |
710 _promotion_failed = false; | |
711 from()->set_next_compaction_space(NULL); | |
712 } | |
713 | |
714 void DefNewGeneration::remove_forwarding_pointers() { | |
715 RemoveForwardPointerClosure rspc; | |
716 eden()->object_iterate(&rspc); | |
717 from()->object_iterate(&rspc); | |
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718 |
0 | 719 // Now restore saved marks, if any. |
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720 assert(_objs_with_preserved_marks.size() == _preserved_marks_of_objs.size(), |
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721 "should be the same"); |
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722 while (!_objs_with_preserved_marks.is_empty()) { |
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723 oop obj = _objs_with_preserved_marks.pop(); |
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724 markOop m = _preserved_marks_of_objs.pop(); |
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725 obj->set_mark(m); |
0 | 726 } |
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727 _objs_with_preserved_marks.clear(true); |
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728 _preserved_marks_of_objs.clear(true); |
0 | 729 } |
730 | |
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731 void DefNewGeneration::preserve_mark(oop obj, markOop m) { |
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732 assert(promotion_failed() && m->must_be_preserved_for_promotion_failure(obj), |
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733 "Oversaving!"); |
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734 _objs_with_preserved_marks.push(obj); |
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735 _preserved_marks_of_objs.push(m); |
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736 } |
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737 |
0 | 738 void DefNewGeneration::preserve_mark_if_necessary(oop obj, markOop m) { |
739 if (m->must_be_preserved_for_promotion_failure(obj)) { | |
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740 preserve_mark(obj, m); |
0 | 741 } |
742 } | |
743 | |
744 void DefNewGeneration::handle_promotion_failure(oop old) { | |
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745 if (PrintPromotionFailure && !_promotion_failed) { |
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746 gclog_or_tty->print(" (promotion failure size = " SIZE_FORMAT ") ", |
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747 old->size()); |
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748 } |
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749 _promotion_failed = true; |
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750 preserve_mark_if_necessary(old, old->mark()); |
0 | 751 // forward to self |
752 old->forward_to(old); | |
753 | |
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754 _promo_failure_scan_stack.push(old); |
0 | 755 |
756 if (!_promo_failure_drain_in_progress) { | |
757 // prevent recursion in copy_to_survivor_space() | |
758 _promo_failure_drain_in_progress = true; | |
759 drain_promo_failure_scan_stack(); | |
760 _promo_failure_drain_in_progress = false; | |
761 } | |
762 } | |
763 | |
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764 oop DefNewGeneration::copy_to_survivor_space(oop old) { |
0 | 765 assert(is_in_reserved(old) && !old->is_forwarded(), |
766 "shouldn't be scavenging this oop"); | |
767 size_t s = old->size(); | |
768 oop obj = NULL; | |
769 | |
770 // Try allocating obj in to-space (unless too old) | |
771 if (old->age() < tenuring_threshold()) { | |
772 obj = (oop) to()->allocate(s); | |
773 } | |
774 | |
775 // Otherwise try allocating obj tenured | |
776 if (obj == NULL) { | |
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777 obj = _next_gen->promote(old, s); |
0 | 778 if (obj == NULL) { |
779 handle_promotion_failure(old); | |
780 return old; | |
781 } | |
782 } else { | |
783 // Prefetch beyond obj | |
784 const intx interval = PrefetchCopyIntervalInBytes; | |
785 Prefetch::write(obj, interval); | |
786 | |
787 // Copy obj | |
788 Copy::aligned_disjoint_words((HeapWord*)old, (HeapWord*)obj, s); | |
789 | |
790 // Increment age if obj still in new generation | |
791 obj->incr_age(); | |
792 age_table()->add(obj, s); | |
793 } | |
794 | |
795 // Done, insert forward pointer to obj in this header | |
796 old->forward_to(obj); | |
797 | |
798 return obj; | |
799 } | |
800 | |
801 void DefNewGeneration::drain_promo_failure_scan_stack() { | |
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802 while (!_promo_failure_scan_stack.is_empty()) { |
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803 oop obj = _promo_failure_scan_stack.pop(); |
0 | 804 obj->oop_iterate(_promo_failure_scan_stack_closure); |
805 } | |
806 } | |
807 | |
808 void DefNewGeneration::save_marks() { | |
809 eden()->set_saved_mark(); | |
810 to()->set_saved_mark(); | |
811 from()->set_saved_mark(); | |
812 } | |
813 | |
814 | |
815 void DefNewGeneration::reset_saved_marks() { | |
816 eden()->reset_saved_mark(); | |
817 to()->reset_saved_mark(); | |
818 from()->reset_saved_mark(); | |
819 } | |
820 | |
821 | |
822 bool DefNewGeneration::no_allocs_since_save_marks() { | |
823 assert(eden()->saved_mark_at_top(), "Violated spec - alloc in eden"); | |
824 assert(from()->saved_mark_at_top(), "Violated spec - alloc in from"); | |
825 return to()->saved_mark_at_top(); | |
826 } | |
827 | |
828 #define DefNew_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
829 \ | |
830 void DefNewGeneration:: \ | |
831 oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
832 cl->set_generation(this); \ | |
833 eden()->oop_since_save_marks_iterate##nv_suffix(cl); \ | |
834 to()->oop_since_save_marks_iterate##nv_suffix(cl); \ | |
835 from()->oop_since_save_marks_iterate##nv_suffix(cl); \ | |
836 cl->reset_generation(); \ | |
837 save_marks(); \ | |
838 } | |
839 | |
840 ALL_SINCE_SAVE_MARKS_CLOSURES(DefNew_SINCE_SAVE_MARKS_DEFN) | |
841 | |
842 #undef DefNew_SINCE_SAVE_MARKS_DEFN | |
843 | |
844 void DefNewGeneration::contribute_scratch(ScratchBlock*& list, Generation* requestor, | |
845 size_t max_alloc_words) { | |
846 if (requestor == this || _promotion_failed) return; | |
847 assert(requestor->level() > level(), "DefNewGeneration must be youngest"); | |
848 | |
849 /* $$$ Assert this? "trace" is a "MarkSweep" function so that's not appropriate. | |
850 if (to_space->top() > to_space->bottom()) { | |
851 trace("to_space not empty when contribute_scratch called"); | |
852 } | |
853 */ | |
854 | |
855 ContiguousSpace* to_space = to(); | |
856 assert(to_space->end() >= to_space->top(), "pointers out of order"); | |
857 size_t free_words = pointer_delta(to_space->end(), to_space->top()); | |
858 if (free_words >= MinFreeScratchWords) { | |
859 ScratchBlock* sb = (ScratchBlock*)to_space->top(); | |
860 sb->num_words = free_words; | |
861 sb->next = list; | |
862 list = sb; | |
863 } | |
864 } | |
865 | |
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866 void DefNewGeneration::reset_scratch() { |
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867 // If contributing scratch in to_space, mangle all of |
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868 // to_space if ZapUnusedHeapArea. This is needed because |
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869 // top is not maintained while using to-space as scratch. |
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870 if (ZapUnusedHeapArea) { |
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871 to()->mangle_unused_area_complete(); |
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872 } |
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873 } |
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874 |
0 | 875 bool DefNewGeneration::collection_attempt_is_safe() { |
876 if (!to()->is_empty()) { | |
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877 if (Verbose && PrintGCDetails) { |
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878 gclog_or_tty->print(" :: to is not empty :: "); |
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879 } |
0 | 880 return false; |
881 } | |
882 if (_next_gen == NULL) { | |
883 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
884 _next_gen = gch->next_gen(this); | |
885 assert(_next_gen != NULL, | |
886 "This must be the youngest gen, and not the only gen"); | |
887 } | |
1888
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888 return _next_gen->promotion_attempt_is_safe(used()); |
0 | 889 } |
890 | |
891 void DefNewGeneration::gc_epilogue(bool full) { | |
1889
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892 DEBUG_ONLY(static bool seen_incremental_collection_failed = false;) |
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893 |
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894 assert(!GC_locker::is_active(), "We should not be executing here"); |
0 | 895 // Check if the heap is approaching full after a collection has |
896 // been done. Generally the young generation is empty at | |
897 // a minimum at the end of a collection. If it is not, then | |
898 // the heap is approaching full. | |
899 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
1888
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900 if (full) { |
1889
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901 DEBUG_ONLY(seen_incremental_collection_failed = false;) |
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902 if (!collection_attempt_is_safe() && !_eden_space->is_empty()) { |
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903 if (Verbose && PrintGCDetails) { |
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904 gclog_or_tty->print("DefNewEpilogue: cause(%s), full, not safe, set_failed, set_alloc_from, clear_seen", |
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905 GCCause::to_string(gch->gc_cause())); |
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906 } |
1888
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907 gch->set_incremental_collection_failed(); // Slight lie: a full gc left us in that state |
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908 set_should_allocate_from_space(); // we seem to be running out of space |
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909 } else { |
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910 if (Verbose && PrintGCDetails) { |
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911 gclog_or_tty->print("DefNewEpilogue: cause(%s), full, safe, clear_failed, clear_alloc_from, clear_seen", |
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912 GCCause::to_string(gch->gc_cause())); |
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913 } |
1888
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914 gch->clear_incremental_collection_failed(); // We just did a full collection |
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915 clear_should_allocate_from_space(); // if set |
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916 } |
0 | 917 } else { |
1889
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918 #ifdef ASSERT |
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919 // It is possible that incremental_collection_failed() == true |
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920 // here, because an attempted scavenge did not succeed. The policy |
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921 // is normally expected to cause a full collection which should |
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922 // clear that condition, so we should not be here twice in a row |
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923 // with incremental_collection_failed() == true without having done |
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924 // a full collection in between. |
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925 if (!seen_incremental_collection_failed && |
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926 gch->incremental_collection_failed()) { |
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927 if (Verbose && PrintGCDetails) { |
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928 gclog_or_tty->print("DefNewEpilogue: cause(%s), not full, not_seen_failed, failed, set_seen_failed", |
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929 GCCause::to_string(gch->gc_cause())); |
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930 } |
1889
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931 seen_incremental_collection_failed = true; |
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932 } else if (seen_incremental_collection_failed) { |
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933 if (Verbose && PrintGCDetails) { |
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934 gclog_or_tty->print("DefNewEpilogue: cause(%s), not full, seen_failed, will_clear_seen_failed", |
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935 GCCause::to_string(gch->gc_cause())); |
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936 } |
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937 assert(gch->gc_cause() == GCCause::_scavenge_alot || |
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938 (gch->gc_cause() == GCCause::_java_lang_system_gc && UseConcMarkSweepGC && ExplicitGCInvokesConcurrent) || |
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939 !gch->incremental_collection_failed(), |
1953
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940 "Twice in a row"); |
1889
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941 seen_incremental_collection_failed = false; |
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942 } |
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943 #endif // ASSERT |
0 | 944 } |
945 | |
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946 if (ZapUnusedHeapArea) { |
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947 eden()->check_mangled_unused_area_complete(); |
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948 from()->check_mangled_unused_area_complete(); |
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949 to()->check_mangled_unused_area_complete(); |
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950 } |
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951 |
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952 if (!CleanChunkPoolAsync) { |
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953 Chunk::clean_chunk_pool(); |
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954 } |
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955 |
0 | 956 // update the generation and space performance counters |
957 update_counters(); | |
958 gch->collector_policy()->counters()->update_counters(); | |
959 } | |
960 | |
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961 void DefNewGeneration::record_spaces_top() { |
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962 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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963 eden()->set_top_for_allocations(); |
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964 to()->set_top_for_allocations(); |
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965 from()->set_top_for_allocations(); |
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966 } |
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967 |
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968 |
0 | 969 void DefNewGeneration::update_counters() { |
970 if (UsePerfData) { | |
971 _eden_counters->update_all(); | |
972 _from_counters->update_all(); | |
973 _to_counters->update_all(); | |
974 _gen_counters->update_all(); | |
975 } | |
976 } | |
977 | |
6008 | 978 void DefNewGeneration::verify() { |
979 eden()->verify(); | |
980 from()->verify(); | |
981 to()->verify(); | |
0 | 982 } |
983 | |
984 void DefNewGeneration::print_on(outputStream* st) const { | |
985 Generation::print_on(st); | |
986 st->print(" eden"); | |
987 eden()->print_on(st); | |
988 st->print(" from"); | |
989 from()->print_on(st); | |
990 st->print(" to "); | |
991 to()->print_on(st); | |
992 } | |
993 | |
994 | |
995 const char* DefNewGeneration::name() const { | |
996 return "def new generation"; | |
997 } | |
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998 |
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999 // Moved from inline file as they are not called inline |
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1000 CompactibleSpace* DefNewGeneration::first_compaction_space() const { |
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1001 return eden(); |
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1002 } |
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1003 |
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1004 HeapWord* DefNewGeneration::allocate(size_t word_size, |
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1005 bool is_tlab) { |
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1006 // This is the slow-path allocation for the DefNewGeneration. |
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1007 // Most allocations are fast-path in compiled code. |
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1008 // We try to allocate from the eden. If that works, we are happy. |
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1009 // Note that since DefNewGeneration supports lock-free allocation, we |
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1010 // have to use it here, as well. |
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1011 HeapWord* result = eden()->par_allocate(word_size); |
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1012 if (result != NULL) { |
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1013 return result; |
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1014 } |
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1015 do { |
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1016 HeapWord* old_limit = eden()->soft_end(); |
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1017 if (old_limit < eden()->end()) { |
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1018 // Tell the next generation we reached a limit. |
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1019 HeapWord* new_limit = |
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1020 next_gen()->allocation_limit_reached(eden(), eden()->top(), word_size); |
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1021 if (new_limit != NULL) { |
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1022 Atomic::cmpxchg_ptr(new_limit, eden()->soft_end_addr(), old_limit); |
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1023 } else { |
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1024 assert(eden()->soft_end() == eden()->end(), |
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1025 "invalid state after allocation_limit_reached returned null"); |
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1026 } |
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1027 } else { |
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1028 // The allocation failed and the soft limit is equal to the hard limit, |
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1029 // there are no reasons to do an attempt to allocate |
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1030 assert(old_limit == eden()->end(), "sanity check"); |
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1031 break; |
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1032 } |
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1033 // Try to allocate until succeeded or the soft limit can't be adjusted |
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1034 result = eden()->par_allocate(word_size); |
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1035 } while (result == NULL); |
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1036 |
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1037 // If the eden is full and the last collection bailed out, we are running |
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1038 // out of heap space, and we try to allocate the from-space, too. |
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1039 // allocate_from_space can't be inlined because that would introduce a |
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1040 // circular dependency at compile time. |
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1041 if (result == NULL) { |
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1042 result = allocate_from_space(word_size); |
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1043 } |
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1044 return result; |
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1045 } |
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1046 |
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1047 HeapWord* DefNewGeneration::par_allocate(size_t word_size, |
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1048 bool is_tlab) { |
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1049 return eden()->par_allocate(word_size); |
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1050 } |
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1051 |
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1052 void DefNewGeneration::gc_prologue(bool full) { |
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1053 // Ensure that _end and _soft_end are the same in eden space. |
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1054 eden()->set_soft_end(eden()->end()); |
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1055 } |
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1056 |
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1057 size_t DefNewGeneration::tlab_capacity() const { |
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1058 return eden()->capacity(); |
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1059 } |
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1060 |
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1061 size_t DefNewGeneration::unsafe_max_tlab_alloc() const { |
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1062 return unsafe_max_alloc_nogc(); |
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1063 } |