Mercurial > hg > graal-compiler
annotate src/share/vm/memory/defNewGeneration.cpp @ 263:12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
Summary: Maintain a high water mark for the allocations in a space and mangle only up to that high water mark.
Reviewed-by: ysr, apetrusenko
| author | jmasa |
|---|---|
| date | Wed, 09 Jul 2008 15:08:55 -0700 |
| parents | ba764ed4b6f2 |
| children | 850fdf70db2b |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_defNewGeneration.cpp.incl" | |
| 27 | |
| 28 // | |
| 29 // DefNewGeneration functions. | |
| 30 | |
| 31 // Methods of protected closure types. | |
| 32 | |
| 33 DefNewGeneration::IsAliveClosure::IsAliveClosure(Generation* g) : _g(g) { | |
| 34 assert(g->level() == 0, "Optimized for youngest gen."); | |
| 35 } | |
| 36 void DefNewGeneration::IsAliveClosure::do_object(oop p) { | |
| 37 assert(false, "Do not call."); | |
| 38 } | |
| 39 bool DefNewGeneration::IsAliveClosure::do_object_b(oop p) { | |
| 40 return (HeapWord*)p >= _g->reserved().end() || p->is_forwarded(); | |
| 41 } | |
| 42 | |
| 43 DefNewGeneration::KeepAliveClosure:: | |
| 44 KeepAliveClosure(ScanWeakRefClosure* cl) : _cl(cl) { | |
| 45 GenRemSet* rs = GenCollectedHeap::heap()->rem_set(); | |
| 46 assert(rs->rs_kind() == GenRemSet::CardTable, "Wrong rem set kind."); | |
| 47 _rs = (CardTableRS*)rs; | |
| 48 } | |
| 49 | |
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50 void DefNewGeneration::KeepAliveClosure::do_oop(oop* p) { DefNewGeneration::KeepAliveClosure::do_oop_work(p); } |
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51 void DefNewGeneration::KeepAliveClosure::do_oop(narrowOop* p) { DefNewGeneration::KeepAliveClosure::do_oop_work(p); } |
| 0 | 52 |
| 53 | |
| 54 DefNewGeneration::FastKeepAliveClosure:: | |
| 55 FastKeepAliveClosure(DefNewGeneration* g, ScanWeakRefClosure* cl) : | |
| 56 DefNewGeneration::KeepAliveClosure(cl) { | |
| 57 _boundary = g->reserved().end(); | |
| 58 } | |
| 59 | |
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60 void DefNewGeneration::FastKeepAliveClosure::do_oop(oop* p) { DefNewGeneration::FastKeepAliveClosure::do_oop_work(p); } |
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61 void DefNewGeneration::FastKeepAliveClosure::do_oop(narrowOop* p) { DefNewGeneration::FastKeepAliveClosure::do_oop_work(p); } |
| 0 | 62 |
| 63 DefNewGeneration::EvacuateFollowersClosure:: | |
| 64 EvacuateFollowersClosure(GenCollectedHeap* gch, int level, | |
| 65 ScanClosure* cur, ScanClosure* older) : | |
| 66 _gch(gch), _level(level), | |
| 67 _scan_cur_or_nonheap(cur), _scan_older(older) | |
| 68 {} | |
| 69 | |
| 70 void DefNewGeneration::EvacuateFollowersClosure::do_void() { | |
| 71 do { | |
| 72 _gch->oop_since_save_marks_iterate(_level, _scan_cur_or_nonheap, | |
| 73 _scan_older); | |
| 74 } while (!_gch->no_allocs_since_save_marks(_level)); | |
| 75 } | |
| 76 | |
| 77 DefNewGeneration::FastEvacuateFollowersClosure:: | |
| 78 FastEvacuateFollowersClosure(GenCollectedHeap* gch, int level, | |
| 79 DefNewGeneration* gen, | |
| 80 FastScanClosure* cur, FastScanClosure* older) : | |
| 81 _gch(gch), _level(level), _gen(gen), | |
| 82 _scan_cur_or_nonheap(cur), _scan_older(older) | |
| 83 {} | |
| 84 | |
| 85 void DefNewGeneration::FastEvacuateFollowersClosure::do_void() { | |
| 86 do { | |
| 87 _gch->oop_since_save_marks_iterate(_level, _scan_cur_or_nonheap, | |
| 88 _scan_older); | |
| 89 } while (!_gch->no_allocs_since_save_marks(_level)); | |
| 90 guarantee(_gen->promo_failure_scan_stack() == NULL | |
| 91 || _gen->promo_failure_scan_stack()->length() == 0, | |
| 92 "Failed to finish scan"); | |
| 93 } | |
| 94 | |
| 95 ScanClosure::ScanClosure(DefNewGeneration* g, bool gc_barrier) : | |
| 96 OopsInGenClosure(g), _g(g), _gc_barrier(gc_barrier) | |
| 97 { | |
| 98 assert(_g->level() == 0, "Optimized for youngest generation"); | |
| 99 _boundary = _g->reserved().end(); | |
| 100 } | |
| 101 | |
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102 void ScanClosure::do_oop(oop* p) { ScanClosure::do_oop_work(p); } |
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103 void ScanClosure::do_oop(narrowOop* p) { ScanClosure::do_oop_work(p); } |
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104 |
| 0 | 105 FastScanClosure::FastScanClosure(DefNewGeneration* g, bool gc_barrier) : |
| 106 OopsInGenClosure(g), _g(g), _gc_barrier(gc_barrier) | |
| 107 { | |
| 108 assert(_g->level() == 0, "Optimized for youngest generation"); | |
| 109 _boundary = _g->reserved().end(); | |
| 110 } | |
| 111 | |
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112 void FastScanClosure::do_oop(oop* p) { FastScanClosure::do_oop_work(p); } |
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113 void FastScanClosure::do_oop(narrowOop* p) { FastScanClosure::do_oop_work(p); } |
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114 |
| 0 | 115 ScanWeakRefClosure::ScanWeakRefClosure(DefNewGeneration* g) : |
| 116 OopClosure(g->ref_processor()), _g(g) | |
| 117 { | |
| 118 assert(_g->level() == 0, "Optimized for youngest generation"); | |
| 119 _boundary = _g->reserved().end(); | |
| 120 } | |
| 121 | |
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122 void ScanWeakRefClosure::do_oop(oop* p) { ScanWeakRefClosure::do_oop_work(p); } |
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123 void ScanWeakRefClosure::do_oop(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); } |
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124 |
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125 void FilteringClosure::do_oop(oop* p) { FilteringClosure::do_oop_work(p); } |
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126 void FilteringClosure::do_oop(narrowOop* p) { FilteringClosure::do_oop_work(p); } |
| 0 | 127 |
| 128 DefNewGeneration::DefNewGeneration(ReservedSpace rs, | |
| 129 size_t initial_size, | |
| 130 int level, | |
| 131 const char* policy) | |
| 132 : Generation(rs, initial_size, level), | |
| 133 _objs_with_preserved_marks(NULL), | |
| 134 _preserved_marks_of_objs(NULL), | |
| 135 _promo_failure_scan_stack(NULL), | |
| 136 _promo_failure_drain_in_progress(false), | |
| 137 _should_allocate_from_space(false) | |
| 138 { | |
| 139 MemRegion cmr((HeapWord*)_virtual_space.low(), | |
| 140 (HeapWord*)_virtual_space.high()); | |
| 141 Universe::heap()->barrier_set()->resize_covered_region(cmr); | |
| 142 | |
| 143 if (GenCollectedHeap::heap()->collector_policy()->has_soft_ended_eden()) { | |
| 144 _eden_space = new ConcEdenSpace(this); | |
| 145 } else { | |
| 146 _eden_space = new EdenSpace(this); | |
| 147 } | |
| 148 _from_space = new ContiguousSpace(); | |
| 149 _to_space = new ContiguousSpace(); | |
| 150 | |
| 151 if (_eden_space == NULL || _from_space == NULL || _to_space == NULL) | |
| 152 vm_exit_during_initialization("Could not allocate a new gen space"); | |
| 153 | |
| 154 // Compute the maximum eden and survivor space sizes. These sizes | |
| 155 // are computed assuming the entire reserved space is committed. | |
| 156 // These values are exported as performance counters. | |
| 157 uintx alignment = GenCollectedHeap::heap()->collector_policy()->min_alignment(); | |
| 158 uintx size = _virtual_space.reserved_size(); | |
| 159 _max_survivor_size = compute_survivor_size(size, alignment); | |
| 160 _max_eden_size = size - (2*_max_survivor_size); | |
| 161 | |
| 162 // allocate the performance counters | |
| 163 | |
| 164 // Generation counters -- generation 0, 3 subspaces | |
| 165 _gen_counters = new GenerationCounters("new", 0, 3, &_virtual_space); | |
| 166 _gc_counters = new CollectorCounters(policy, 0); | |
| 167 | |
| 168 _eden_counters = new CSpaceCounters("eden", 0, _max_eden_size, _eden_space, | |
| 169 _gen_counters); | |
| 170 _from_counters = new CSpaceCounters("s0", 1, _max_survivor_size, _from_space, | |
| 171 _gen_counters); | |
| 172 _to_counters = new CSpaceCounters("s1", 2, _max_survivor_size, _to_space, | |
| 173 _gen_counters); | |
| 174 | |
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175 compute_space_boundaries(0, SpaceDecorator::Clear, SpaceDecorator::Mangle); |
| 0 | 176 update_counters(); |
| 177 _next_gen = NULL; | |
| 178 _tenuring_threshold = MaxTenuringThreshold; | |
| 179 _pretenure_size_threshold_words = PretenureSizeThreshold >> LogHeapWordSize; | |
| 180 } | |
| 181 | |
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182 void DefNewGeneration::compute_space_boundaries(uintx minimum_eden_size, |
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183 bool clear_space, |
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184 bool mangle_space) { |
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185 uintx alignment = |
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186 GenCollectedHeap::heap()->collector_policy()->min_alignment(); |
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187 |
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188 // If the spaces are being cleared (only done at heap initialization |
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189 // currently), the survivor spaces need not be empty. |
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190 // Otherwise, no care is taken for used areas in the survivor spaces |
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191 // so check. |
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192 assert(clear_space || (to()->is_empty() && from()->is_empty()), |
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193 "Initialization of the survivor spaces assumes these are empty"); |
| 0 | 194 |
| 195 // Compute sizes | |
| 196 uintx size = _virtual_space.committed_size(); | |
| 197 uintx survivor_size = compute_survivor_size(size, alignment); | |
| 198 uintx eden_size = size - (2*survivor_size); | |
| 199 assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); | |
| 200 | |
| 201 if (eden_size < minimum_eden_size) { | |
| 202 // May happen due to 64Kb rounding, if so adjust eden size back up | |
| 203 minimum_eden_size = align_size_up(minimum_eden_size, alignment); | |
| 204 uintx maximum_survivor_size = (size - minimum_eden_size) / 2; | |
| 205 uintx unaligned_survivor_size = | |
| 206 align_size_down(maximum_survivor_size, alignment); | |
| 207 survivor_size = MAX2(unaligned_survivor_size, alignment); | |
| 208 eden_size = size - (2*survivor_size); | |
| 209 assert(eden_size > 0 && survivor_size <= eden_size, "just checking"); | |
| 210 assert(eden_size >= minimum_eden_size, "just checking"); | |
| 211 } | |
| 212 | |
| 213 char *eden_start = _virtual_space.low(); | |
| 214 char *from_start = eden_start + eden_size; | |
| 215 char *to_start = from_start + survivor_size; | |
| 216 char *to_end = to_start + survivor_size; | |
| 217 | |
| 218 assert(to_end == _virtual_space.high(), "just checking"); | |
| 219 assert(Space::is_aligned((HeapWord*)eden_start), "checking alignment"); | |
| 220 assert(Space::is_aligned((HeapWord*)from_start), "checking alignment"); | |
| 221 assert(Space::is_aligned((HeapWord*)to_start), "checking alignment"); | |
| 222 | |
| 223 MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)from_start); | |
| 224 MemRegion fromMR((HeapWord*)from_start, (HeapWord*)to_start); | |
| 225 MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); | |
| 226 | |
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227 // A minimum eden size implies that there is a part of eden that |
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228 // is being used and that affects the initialization of any |
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229 // newly formed eden. |
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230 bool live_in_eden = minimum_eden_size > 0; |
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231 |
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232 // If not clearing the spaces, do some checking to verify that |
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233 // the space are already mangled. |
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234 if (!clear_space) { |
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235 // Must check mangling before the spaces are reshaped. Otherwise, |
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236 // the bottom or end of one space may have moved into another |
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237 // a failure of the check may not correctly indicate which space |
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238 // is not properly mangled. |
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239 if (ZapUnusedHeapArea) { |
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240 HeapWord* limit = (HeapWord*) _virtual_space.high(); |
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241 eden()->check_mangled_unused_area(limit); |
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242 from()->check_mangled_unused_area(limit); |
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243 to()->check_mangled_unused_area(limit); |
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244 } |
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245 } |
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246 |
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247 // Reset the spaces for their new regions. |
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248 eden()->initialize(edenMR, |
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249 clear_space && !live_in_eden, |
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250 SpaceDecorator::Mangle); |
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251 // If clear_space and live_in_eden, we will not have cleared any |
| 0 | 252 // portion of eden above its top. This can cause newly |
| 253 // expanded space not to be mangled if using ZapUnusedHeapArea. | |
| 254 // We explicitly do such mangling here. | |
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255 if (ZapUnusedHeapArea && clear_space && live_in_eden && mangle_space) { |
| 0 | 256 eden()->mangle_unused_area(); |
| 257 } | |
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258 from()->initialize(fromMR, clear_space, mangle_space); |
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259 to()->initialize(toMR, clear_space, mangle_space); |
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260 |
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261 // Set next compaction spaces. |
| 0 | 262 eden()->set_next_compaction_space(from()); |
| 263 // The to-space is normally empty before a compaction so need | |
| 264 // not be considered. The exception is during promotion | |
| 265 // failure handling when to-space can contain live objects. | |
| 266 from()->set_next_compaction_space(NULL); | |
| 267 } | |
| 268 | |
| 269 void DefNewGeneration::swap_spaces() { | |
| 270 ContiguousSpace* s = from(); | |
| 271 _from_space = to(); | |
| 272 _to_space = s; | |
| 273 eden()->set_next_compaction_space(from()); | |
| 274 // The to-space is normally empty before a compaction so need | |
| 275 // not be considered. The exception is during promotion | |
| 276 // failure handling when to-space can contain live objects. | |
| 277 from()->set_next_compaction_space(NULL); | |
| 278 | |
| 279 if (UsePerfData) { | |
| 280 CSpaceCounters* c = _from_counters; | |
| 281 _from_counters = _to_counters; | |
| 282 _to_counters = c; | |
| 283 } | |
| 284 } | |
| 285 | |
| 286 bool DefNewGeneration::expand(size_t bytes) { | |
| 287 MutexLocker x(ExpandHeap_lock); | |
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288 HeapWord* prev_high = (HeapWord*) _virtual_space.high(); |
| 0 | 289 bool success = _virtual_space.expand_by(bytes); |
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290 if (success && ZapUnusedHeapArea) { |
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291 // Mangle newly committed space immediately because it |
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292 // can be done here more simply that after the new |
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293 // spaces have been computed. |
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294 HeapWord* new_high = (HeapWord*) _virtual_space.high(); |
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295 MemRegion mangle_region(prev_high, new_high); |
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296 SpaceMangler::mangle_region(mangle_region); |
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297 } |
| 0 | 298 |
| 299 // Do not attempt an expand-to-the reserve size. The | |
| 300 // request should properly observe the maximum size of | |
| 301 // the generation so an expand-to-reserve should be | |
| 302 // unnecessary. Also a second call to expand-to-reserve | |
| 303 // value potentially can cause an undue expansion. | |
| 304 // For example if the first expand fail for unknown reasons, | |
| 305 // but the second succeeds and expands the heap to its maximum | |
| 306 // value. | |
| 307 if (GC_locker::is_active()) { | |
| 308 if (PrintGC && Verbose) { | |
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309 gclog_or_tty->print_cr("Garbage collection disabled, " |
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310 "expanded heap instead"); |
| 0 | 311 } |
| 312 } | |
| 313 | |
| 314 return success; | |
| 315 } | |
| 316 | |
| 317 | |
| 318 void DefNewGeneration::compute_new_size() { | |
| 319 // This is called after a gc that includes the following generation | |
| 320 // (which is required to exist.) So from-space will normally be empty. | |
| 321 // Note that we check both spaces, since if scavenge failed they revert roles. | |
| 322 // If not we bail out (otherwise we would have to relocate the objects) | |
| 323 if (!from()->is_empty() || !to()->is_empty()) { | |
| 324 return; | |
| 325 } | |
| 326 | |
| 327 int next_level = level() + 1; | |
| 328 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 329 assert(next_level < gch->_n_gens, | |
| 330 "DefNewGeneration cannot be an oldest gen"); | |
| 331 | |
| 332 Generation* next_gen = gch->_gens[next_level]; | |
| 333 size_t old_size = next_gen->capacity(); | |
| 334 size_t new_size_before = _virtual_space.committed_size(); | |
| 335 size_t min_new_size = spec()->init_size(); | |
| 336 size_t max_new_size = reserved().byte_size(); | |
| 337 assert(min_new_size <= new_size_before && | |
| 338 new_size_before <= max_new_size, | |
| 339 "just checking"); | |
| 340 // All space sizes must be multiples of Generation::GenGrain. | |
| 341 size_t alignment = Generation::GenGrain; | |
| 342 | |
| 343 // Compute desired new generation size based on NewRatio and | |
| 344 // NewSizeThreadIncrease | |
| 345 size_t desired_new_size = old_size/NewRatio; | |
| 346 int threads_count = Threads::number_of_non_daemon_threads(); | |
| 347 size_t thread_increase_size = threads_count * NewSizeThreadIncrease; | |
| 348 desired_new_size = align_size_up(desired_new_size + thread_increase_size, alignment); | |
| 349 | |
| 350 // Adjust new generation size | |
| 351 desired_new_size = MAX2(MIN2(desired_new_size, max_new_size), min_new_size); | |
| 352 assert(desired_new_size <= max_new_size, "just checking"); | |
| 353 | |
| 354 bool changed = false; | |
| 355 if (desired_new_size > new_size_before) { | |
| 356 size_t change = desired_new_size - new_size_before; | |
| 357 assert(change % alignment == 0, "just checking"); | |
| 358 if (expand(change)) { | |
| 359 changed = true; | |
| 360 } | |
| 361 // If the heap failed to expand to the desired size, | |
| 362 // "changed" will be false. If the expansion failed | |
| 363 // (and at this point it was expected to succeed), | |
| 364 // ignore the failure (leaving "changed" as false). | |
| 365 } | |
| 366 if (desired_new_size < new_size_before && eden()->is_empty()) { | |
| 367 // bail out of shrinking if objects in eden | |
| 368 size_t change = new_size_before - desired_new_size; | |
| 369 assert(change % alignment == 0, "just checking"); | |
| 370 _virtual_space.shrink_by(change); | |
| 371 changed = true; | |
| 372 } | |
| 373 if (changed) { | |
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374 // The spaces have already been mangled at this point but |
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375 // may not have been cleared (set top = bottom) and should be. |
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376 // Mangling was done when the heap was being expanded. |
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377 compute_space_boundaries(eden()->used(), |
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378 SpaceDecorator::Clear, |
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379 SpaceDecorator::DontMangle); |
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380 MemRegion cmr((HeapWord*)_virtual_space.low(), |
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381 (HeapWord*)_virtual_space.high()); |
| 0 | 382 Universe::heap()->barrier_set()->resize_covered_region(cmr); |
| 383 if (Verbose && PrintGC) { | |
| 384 size_t new_size_after = _virtual_space.committed_size(); | |
| 385 size_t eden_size_after = eden()->capacity(); | |
| 386 size_t survivor_size_after = from()->capacity(); | |
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387 gclog_or_tty->print("New generation size " SIZE_FORMAT "K->" |
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388 SIZE_FORMAT "K [eden=" |
| 0 | 389 SIZE_FORMAT "K,survivor=" SIZE_FORMAT "K]", |
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390 new_size_before/K, new_size_after/K, |
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391 eden_size_after/K, survivor_size_after/K); |
| 0 | 392 if (WizardMode) { |
| 393 gclog_or_tty->print("[allowed " SIZE_FORMAT "K extra for %d threads]", | |
| 394 thread_increase_size/K, threads_count); | |
| 395 } | |
| 396 gclog_or_tty->cr(); | |
| 397 } | |
| 398 } | |
| 399 } | |
| 400 | |
| 401 void DefNewGeneration::object_iterate_since_last_GC(ObjectClosure* cl) { | |
| 402 // $$$ This may be wrong in case of "scavenge failure"? | |
| 403 eden()->object_iterate(cl); | |
| 404 } | |
| 405 | |
| 406 void DefNewGeneration::younger_refs_iterate(OopsInGenClosure* cl) { | |
| 407 assert(false, "NYI -- are you sure you want to call this?"); | |
| 408 } | |
| 409 | |
| 410 | |
| 411 size_t DefNewGeneration::capacity() const { | |
| 412 return eden()->capacity() | |
| 413 + from()->capacity(); // to() is only used during scavenge | |
| 414 } | |
| 415 | |
| 416 | |
| 417 size_t DefNewGeneration::used() const { | |
| 418 return eden()->used() | |
| 419 + from()->used(); // to() is only used during scavenge | |
| 420 } | |
| 421 | |
| 422 | |
| 423 size_t DefNewGeneration::free() const { | |
| 424 return eden()->free() | |
| 425 + from()->free(); // to() is only used during scavenge | |
| 426 } | |
| 427 | |
| 428 size_t DefNewGeneration::max_capacity() const { | |
| 429 const size_t alignment = GenCollectedHeap::heap()->collector_policy()->min_alignment(); | |
| 430 const size_t reserved_bytes = reserved().byte_size(); | |
| 431 return reserved_bytes - compute_survivor_size(reserved_bytes, alignment); | |
| 432 } | |
| 433 | |
| 434 size_t DefNewGeneration::unsafe_max_alloc_nogc() const { | |
| 435 return eden()->free(); | |
| 436 } | |
| 437 | |
| 438 size_t DefNewGeneration::capacity_before_gc() const { | |
| 439 return eden()->capacity(); | |
| 440 } | |
| 441 | |
| 442 size_t DefNewGeneration::contiguous_available() const { | |
| 443 return eden()->free(); | |
| 444 } | |
| 445 | |
| 446 | |
| 447 HeapWord** DefNewGeneration::top_addr() const { return eden()->top_addr(); } | |
| 448 HeapWord** DefNewGeneration::end_addr() const { return eden()->end_addr(); } | |
| 449 | |
| 450 void DefNewGeneration::object_iterate(ObjectClosure* blk) { | |
| 451 eden()->object_iterate(blk); | |
| 452 from()->object_iterate(blk); | |
| 453 } | |
| 454 | |
| 455 | |
| 456 void DefNewGeneration::space_iterate(SpaceClosure* blk, | |
| 457 bool usedOnly) { | |
| 458 blk->do_space(eden()); | |
| 459 blk->do_space(from()); | |
| 460 blk->do_space(to()); | |
| 461 } | |
| 462 | |
| 463 // The last collection bailed out, we are running out of heap space, | |
| 464 // so we try to allocate the from-space, too. | |
| 465 HeapWord* DefNewGeneration::allocate_from_space(size_t size) { | |
| 466 HeapWord* result = NULL; | |
| 467 if (PrintGC && Verbose) { | |
| 468 gclog_or_tty->print("DefNewGeneration::allocate_from_space(%u):" | |
| 469 " will_fail: %s" | |
| 470 " heap_lock: %s" | |
| 471 " free: " SIZE_FORMAT, | |
| 472 size, | |
| 473 GenCollectedHeap::heap()->incremental_collection_will_fail() ? "true" : "false", | |
| 474 Heap_lock->is_locked() ? "locked" : "unlocked", | |
| 475 from()->free()); | |
| 476 } | |
| 477 if (should_allocate_from_space() || GC_locker::is_active_and_needs_gc()) { | |
| 478 if (Heap_lock->owned_by_self() || | |
| 479 (SafepointSynchronize::is_at_safepoint() && | |
| 480 Thread::current()->is_VM_thread())) { | |
| 481 // If the Heap_lock is not locked by this thread, this will be called | |
| 482 // again later with the Heap_lock held. | |
| 483 result = from()->allocate(size); | |
| 484 } else if (PrintGC && Verbose) { | |
| 485 gclog_or_tty->print_cr(" Heap_lock is not owned by self"); | |
| 486 } | |
| 487 } else if (PrintGC && Verbose) { | |
| 488 gclog_or_tty->print_cr(" should_allocate_from_space: NOT"); | |
| 489 } | |
| 490 if (PrintGC && Verbose) { | |
| 491 gclog_or_tty->print_cr(" returns %s", result == NULL ? "NULL" : "object"); | |
| 492 } | |
| 493 return result; | |
| 494 } | |
| 495 | |
| 496 HeapWord* DefNewGeneration::expand_and_allocate(size_t size, | |
| 497 bool is_tlab, | |
| 498 bool parallel) { | |
| 499 // We don't attempt to expand the young generation (but perhaps we should.) | |
| 500 return allocate(size, is_tlab); | |
| 501 } | |
| 502 | |
| 503 | |
| 504 void DefNewGeneration::collect(bool full, | |
| 505 bool clear_all_soft_refs, | |
| 506 size_t size, | |
| 507 bool is_tlab) { | |
| 508 assert(full || size > 0, "otherwise we don't want to collect"); | |
| 509 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 510 _next_gen = gch->next_gen(this); | |
| 511 assert(_next_gen != NULL, | |
| 512 "This must be the youngest gen, and not the only gen"); | |
| 513 | |
| 514 // If the next generation is too full to accomodate promotion | |
| 515 // from this generation, pass on collection; let the next generation | |
| 516 // do it. | |
| 517 if (!collection_attempt_is_safe()) { | |
| 518 gch->set_incremental_collection_will_fail(); | |
| 519 return; | |
| 520 } | |
| 521 assert(to()->is_empty(), "Else not collection_attempt_is_safe"); | |
| 522 | |
| 523 init_assuming_no_promotion_failure(); | |
| 524 | |
| 525 TraceTime t1("GC", PrintGC && !PrintGCDetails, true, gclog_or_tty); | |
| 526 // Capture heap used before collection (for printing). | |
| 527 size_t gch_prev_used = gch->used(); | |
| 528 | |
| 529 SpecializationStats::clear(); | |
| 530 | |
| 531 // These can be shared for all code paths | |
| 532 IsAliveClosure is_alive(this); | |
| 533 ScanWeakRefClosure scan_weak_ref(this); | |
| 534 | |
| 535 age_table()->clear(); | |
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536 to()->clear(SpaceDecorator::Mangle); |
| 0 | 537 |
| 538 gch->rem_set()->prepare_for_younger_refs_iterate(false); | |
| 539 | |
| 540 assert(gch->no_allocs_since_save_marks(0), | |
| 541 "save marks have not been newly set."); | |
| 542 | |
| 543 // Weak refs. | |
| 544 // FIXME: Are these storage leaks, or are they resource objects? | |
| 545 #ifdef COMPILER2 | |
| 546 ReferencePolicy *soft_ref_policy = new LRUMaxHeapPolicy(); | |
| 547 #else | |
| 548 ReferencePolicy *soft_ref_policy = new LRUCurrentHeapPolicy(); | |
| 549 #endif // COMPILER2 | |
| 550 | |
| 551 // Not very pretty. | |
| 552 CollectorPolicy* cp = gch->collector_policy(); | |
| 553 | |
| 554 FastScanClosure fsc_with_no_gc_barrier(this, false); | |
| 555 FastScanClosure fsc_with_gc_barrier(this, true); | |
| 556 | |
| 557 set_promo_failure_scan_stack_closure(&fsc_with_no_gc_barrier); | |
| 558 FastEvacuateFollowersClosure evacuate_followers(gch, _level, this, | |
| 559 &fsc_with_no_gc_barrier, | |
| 560 &fsc_with_gc_barrier); | |
| 561 | |
| 562 assert(gch->no_allocs_since_save_marks(0), | |
| 563 "save marks have not been newly set."); | |
| 564 | |
| 565 gch->gen_process_strong_roots(_level, | |
| 566 true, // Process younger gens, if any, as | |
| 567 // strong roots. | |
| 568 false,// not collecting permanent generation. | |
| 569 SharedHeap::SO_AllClasses, | |
| 570 &fsc_with_gc_barrier, | |
| 571 &fsc_with_no_gc_barrier); | |
| 572 | |
| 573 // "evacuate followers". | |
| 574 evacuate_followers.do_void(); | |
| 575 | |
| 576 FastKeepAliveClosure keep_alive(this, &scan_weak_ref); | |
| 577 ref_processor()->process_discovered_references( | |
| 578 soft_ref_policy, &is_alive, &keep_alive, &evacuate_followers, NULL); | |
| 579 if (!promotion_failed()) { | |
| 580 // Swap the survivor spaces. | |
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581 eden()->clear(SpaceDecorator::Mangle); |
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582 from()->clear(SpaceDecorator::Mangle); |
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583 if (ZapUnusedHeapArea) { |
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584 // This is now done here because of the piece-meal mangling which |
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585 // can check for valid mangling at intermediate points in the |
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586 // collection(s). When a minor collection fails to collect |
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587 // sufficient space resizing of the young generation can occur |
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588 // an redistribute the spaces in the young generation. Mangle |
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589 // here so that unzapped regions don't get distributed to |
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590 // other spaces. |
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591 to()->mangle_unused_area(); |
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592 } |
| 0 | 593 swap_spaces(); |
| 594 | |
| 595 assert(to()->is_empty(), "to space should be empty now"); | |
| 596 | |
| 597 // Set the desired survivor size to half the real survivor space | |
| 598 _tenuring_threshold = | |
| 599 age_table()->compute_tenuring_threshold(to()->capacity()/HeapWordSize); | |
| 600 | |
| 601 if (PrintGC && !PrintGCDetails) { | |
| 602 gch->print_heap_change(gch_prev_used); | |
| 603 } | |
| 604 } else { | |
| 605 assert(HandlePromotionFailure, | |
| 606 "Should not be here unless promotion failure handling is on"); | |
| 607 assert(_promo_failure_scan_stack != NULL && | |
| 608 _promo_failure_scan_stack->length() == 0, "post condition"); | |
| 609 | |
| 610 // deallocate stack and it's elements | |
| 611 delete _promo_failure_scan_stack; | |
| 612 _promo_failure_scan_stack = NULL; | |
| 613 | |
| 614 remove_forwarding_pointers(); | |
| 615 if (PrintGCDetails) { | |
| 616 gclog_or_tty->print(" (promotion failed)"); | |
| 617 } | |
| 618 // Add to-space to the list of space to compact | |
| 619 // when a promotion failure has occurred. In that | |
| 620 // case there can be live objects in to-space | |
| 621 // as a result of a partial evacuation of eden | |
| 622 // and from-space. | |
| 623 swap_spaces(); // For the sake of uniformity wrt ParNewGeneration::collect(). | |
| 624 from()->set_next_compaction_space(to()); | |
| 625 gch->set_incremental_collection_will_fail(); | |
| 626 | |
| 627 // Reset the PromotionFailureALot counters. | |
| 628 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
| 629 } | |
| 630 // set new iteration safe limit for the survivor spaces | |
| 631 from()->set_concurrent_iteration_safe_limit(from()->top()); | |
| 632 to()->set_concurrent_iteration_safe_limit(to()->top()); | |
| 633 SpecializationStats::print(); | |
| 634 update_time_of_last_gc(os::javaTimeMillis()); | |
| 635 } | |
| 636 | |
| 637 class RemoveForwardPointerClosure: public ObjectClosure { | |
| 638 public: | |
| 639 void do_object(oop obj) { | |
| 640 obj->init_mark(); | |
| 641 } | |
| 642 }; | |
| 643 | |
| 644 void DefNewGeneration::init_assuming_no_promotion_failure() { | |
| 645 _promotion_failed = false; | |
| 646 from()->set_next_compaction_space(NULL); | |
| 647 } | |
| 648 | |
| 649 void DefNewGeneration::remove_forwarding_pointers() { | |
| 650 RemoveForwardPointerClosure rspc; | |
| 651 eden()->object_iterate(&rspc); | |
| 652 from()->object_iterate(&rspc); | |
| 653 // Now restore saved marks, if any. | |
| 654 if (_objs_with_preserved_marks != NULL) { | |
| 655 assert(_preserved_marks_of_objs != NULL, "Both or none."); | |
| 656 assert(_objs_with_preserved_marks->length() == | |
| 657 _preserved_marks_of_objs->length(), "Both or none."); | |
| 658 for (int i = 0; i < _objs_with_preserved_marks->length(); i++) { | |
| 659 oop obj = _objs_with_preserved_marks->at(i); | |
| 660 markOop m = _preserved_marks_of_objs->at(i); | |
| 661 obj->set_mark(m); | |
| 662 } | |
| 663 delete _objs_with_preserved_marks; | |
| 664 delete _preserved_marks_of_objs; | |
| 665 _objs_with_preserved_marks = NULL; | |
| 666 _preserved_marks_of_objs = NULL; | |
| 667 } | |
| 668 } | |
| 669 | |
| 670 void DefNewGeneration::preserve_mark_if_necessary(oop obj, markOop m) { | |
| 671 if (m->must_be_preserved_for_promotion_failure(obj)) { | |
| 672 if (_objs_with_preserved_marks == NULL) { | |
| 673 assert(_preserved_marks_of_objs == NULL, "Both or none."); | |
| 674 _objs_with_preserved_marks = new (ResourceObj::C_HEAP) | |
| 675 GrowableArray<oop>(PreserveMarkStackSize, true); | |
| 676 _preserved_marks_of_objs = new (ResourceObj::C_HEAP) | |
| 677 GrowableArray<markOop>(PreserveMarkStackSize, true); | |
| 678 } | |
| 679 _objs_with_preserved_marks->push(obj); | |
| 680 _preserved_marks_of_objs->push(m); | |
| 681 } | |
| 682 } | |
| 683 | |
| 684 void DefNewGeneration::handle_promotion_failure(oop old) { | |
| 685 preserve_mark_if_necessary(old, old->mark()); | |
| 686 // forward to self | |
| 687 old->forward_to(old); | |
| 688 _promotion_failed = true; | |
| 689 | |
| 690 push_on_promo_failure_scan_stack(old); | |
| 691 | |
| 692 if (!_promo_failure_drain_in_progress) { | |
| 693 // prevent recursion in copy_to_survivor_space() | |
| 694 _promo_failure_drain_in_progress = true; | |
| 695 drain_promo_failure_scan_stack(); | |
| 696 _promo_failure_drain_in_progress = false; | |
| 697 } | |
| 698 } | |
| 699 | |
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700 oop DefNewGeneration::copy_to_survivor_space(oop old) { |
| 0 | 701 assert(is_in_reserved(old) && !old->is_forwarded(), |
| 702 "shouldn't be scavenging this oop"); | |
| 703 size_t s = old->size(); | |
| 704 oop obj = NULL; | |
| 705 | |
| 706 // Try allocating obj in to-space (unless too old) | |
| 707 if (old->age() < tenuring_threshold()) { | |
| 708 obj = (oop) to()->allocate(s); | |
| 709 } | |
| 710 | |
| 711 // Otherwise try allocating obj tenured | |
| 712 if (obj == NULL) { | |
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713 obj = _next_gen->promote(old, s); |
| 0 | 714 if (obj == NULL) { |
| 715 if (!HandlePromotionFailure) { | |
| 716 // A failed promotion likely means the MaxLiveObjectEvacuationRatio flag | |
| 717 // is incorrectly set. In any case, its seriously wrong to be here! | |
| 718 vm_exit_out_of_memory(s*wordSize, "promotion"); | |
| 719 } | |
| 720 | |
| 721 handle_promotion_failure(old); | |
| 722 return old; | |
| 723 } | |
| 724 } else { | |
| 725 // Prefetch beyond obj | |
| 726 const intx interval = PrefetchCopyIntervalInBytes; | |
| 727 Prefetch::write(obj, interval); | |
| 728 | |
| 729 // Copy obj | |
| 730 Copy::aligned_disjoint_words((HeapWord*)old, (HeapWord*)obj, s); | |
| 731 | |
| 732 // Increment age if obj still in new generation | |
| 733 obj->incr_age(); | |
| 734 age_table()->add(obj, s); | |
| 735 } | |
| 736 | |
| 737 // Done, insert forward pointer to obj in this header | |
| 738 old->forward_to(obj); | |
| 739 | |
| 740 return obj; | |
| 741 } | |
| 742 | |
| 743 void DefNewGeneration::push_on_promo_failure_scan_stack(oop obj) { | |
| 744 if (_promo_failure_scan_stack == NULL) { | |
| 745 _promo_failure_scan_stack = new (ResourceObj::C_HEAP) | |
| 746 GrowableArray<oop>(40, true); | |
| 747 } | |
| 748 | |
| 749 _promo_failure_scan_stack->push(obj); | |
| 750 } | |
| 751 | |
| 752 void DefNewGeneration::drain_promo_failure_scan_stack() { | |
| 753 assert(_promo_failure_scan_stack != NULL, "precondition"); | |
| 754 | |
| 755 while (_promo_failure_scan_stack->length() > 0) { | |
| 756 oop obj = _promo_failure_scan_stack->pop(); | |
| 757 obj->oop_iterate(_promo_failure_scan_stack_closure); | |
| 758 } | |
| 759 } | |
| 760 | |
| 761 void DefNewGeneration::save_marks() { | |
| 762 eden()->set_saved_mark(); | |
| 763 to()->set_saved_mark(); | |
| 764 from()->set_saved_mark(); | |
| 765 } | |
| 766 | |
| 767 | |
| 768 void DefNewGeneration::reset_saved_marks() { | |
| 769 eden()->reset_saved_mark(); | |
| 770 to()->reset_saved_mark(); | |
| 771 from()->reset_saved_mark(); | |
| 772 } | |
| 773 | |
| 774 | |
| 775 bool DefNewGeneration::no_allocs_since_save_marks() { | |
| 776 assert(eden()->saved_mark_at_top(), "Violated spec - alloc in eden"); | |
| 777 assert(from()->saved_mark_at_top(), "Violated spec - alloc in from"); | |
| 778 return to()->saved_mark_at_top(); | |
| 779 } | |
| 780 | |
| 781 #define DefNew_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
| 782 \ | |
| 783 void DefNewGeneration:: \ | |
| 784 oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
| 785 cl->set_generation(this); \ | |
| 786 eden()->oop_since_save_marks_iterate##nv_suffix(cl); \ | |
| 787 to()->oop_since_save_marks_iterate##nv_suffix(cl); \ | |
| 788 from()->oop_since_save_marks_iterate##nv_suffix(cl); \ | |
| 789 cl->reset_generation(); \ | |
| 790 save_marks(); \ | |
| 791 } | |
| 792 | |
| 793 ALL_SINCE_SAVE_MARKS_CLOSURES(DefNew_SINCE_SAVE_MARKS_DEFN) | |
| 794 | |
| 795 #undef DefNew_SINCE_SAVE_MARKS_DEFN | |
| 796 | |
| 797 void DefNewGeneration::contribute_scratch(ScratchBlock*& list, Generation* requestor, | |
| 798 size_t max_alloc_words) { | |
| 799 if (requestor == this || _promotion_failed) return; | |
| 800 assert(requestor->level() > level(), "DefNewGeneration must be youngest"); | |
| 801 | |
| 802 /* $$$ Assert this? "trace" is a "MarkSweep" function so that's not appropriate. | |
| 803 if (to_space->top() > to_space->bottom()) { | |
| 804 trace("to_space not empty when contribute_scratch called"); | |
| 805 } | |
| 806 */ | |
| 807 | |
| 808 ContiguousSpace* to_space = to(); | |
| 809 assert(to_space->end() >= to_space->top(), "pointers out of order"); | |
| 810 size_t free_words = pointer_delta(to_space->end(), to_space->top()); | |
| 811 if (free_words >= MinFreeScratchWords) { | |
| 812 ScratchBlock* sb = (ScratchBlock*)to_space->top(); | |
| 813 sb->num_words = free_words; | |
| 814 sb->next = list; | |
| 815 list = sb; | |
| 816 } | |
| 817 } | |
| 818 | |
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819 void DefNewGeneration::reset_scratch() { |
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820 // If contributing scratch in to_space, mangle all of |
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821 // to_space if ZapUnusedHeapArea. This is needed because |
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822 // top is not maintained while using to-space as scratch. |
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823 if (ZapUnusedHeapArea) { |
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824 to()->mangle_unused_area_complete(); |
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825 } |
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826 } |
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827 |
| 0 | 828 bool DefNewGeneration::collection_attempt_is_safe() { |
| 829 if (!to()->is_empty()) { | |
| 830 return false; | |
| 831 } | |
| 832 if (_next_gen == NULL) { | |
| 833 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 834 _next_gen = gch->next_gen(this); | |
| 835 assert(_next_gen != NULL, | |
| 836 "This must be the youngest gen, and not the only gen"); | |
| 837 } | |
| 838 | |
| 839 // Decide if there's enough room for a full promotion | |
| 840 // When using extremely large edens, we effectively lose a | |
| 841 // large amount of old space. Use the "MaxLiveObjectEvacuationRatio" | |
| 842 // flag to reduce the minimum evacuation space requirements. If | |
| 843 // there is not enough space to evacuate eden during a scavenge, | |
| 844 // the VM will immediately exit with an out of memory error. | |
| 845 // This flag has not been tested | |
| 846 // with collectors other than simple mark & sweep. | |
| 847 // | |
| 848 // Note that with the addition of promotion failure handling, the | |
| 849 // VM will not immediately exit but will undo the young generation | |
| 850 // collection. The parameter is left here for compatibility. | |
| 851 const double evacuation_ratio = MaxLiveObjectEvacuationRatio / 100.0; | |
| 852 | |
| 853 // worst_case_evacuation is based on "used()". For the case where this | |
| 854 // method is called after a collection, this is still appropriate because | |
| 855 // the case that needs to be detected is one in which a full collection | |
| 856 // has been done and has overflowed into the young generation. In that | |
| 857 // case a minor collection will fail (the overflow of the full collection | |
| 858 // means there is no space in the old generation for any promotion). | |
| 859 size_t worst_case_evacuation = (size_t)(used() * evacuation_ratio); | |
| 860 | |
| 861 return _next_gen->promotion_attempt_is_safe(worst_case_evacuation, | |
| 862 HandlePromotionFailure); | |
| 863 } | |
| 864 | |
| 865 void DefNewGeneration::gc_epilogue(bool full) { | |
| 866 // Check if the heap is approaching full after a collection has | |
| 867 // been done. Generally the young generation is empty at | |
| 868 // a minimum at the end of a collection. If it is not, then | |
| 869 // the heap is approaching full. | |
| 870 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 871 clear_should_allocate_from_space(); | |
| 872 if (collection_attempt_is_safe()) { | |
| 873 gch->clear_incremental_collection_will_fail(); | |
| 874 } else { | |
| 875 gch->set_incremental_collection_will_fail(); | |
| 876 if (full) { // we seem to be running out of space | |
| 877 set_should_allocate_from_space(); | |
| 878 } | |
| 879 } | |
| 880 | |
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881 if (ZapUnusedHeapArea) { |
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882 eden()->check_mangled_unused_area_complete(); |
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883 from()->check_mangled_unused_area_complete(); |
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884 to()->check_mangled_unused_area_complete(); |
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885 } |
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886 |
| 0 | 887 // update the generation and space performance counters |
| 888 update_counters(); | |
| 889 gch->collector_policy()->counters()->update_counters(); | |
| 890 } | |
| 891 | |
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892 void DefNewGeneration::record_spaces_top() { |
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893 assert(ZapUnusedHeapArea, "Not mangling unused space"); |
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894 eden()->set_top_for_allocations(); |
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895 to()->set_top_for_allocations(); |
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896 from()->set_top_for_allocations(); |
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897 } |
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898 |
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899 |
| 0 | 900 void DefNewGeneration::update_counters() { |
| 901 if (UsePerfData) { | |
| 902 _eden_counters->update_all(); | |
| 903 _from_counters->update_all(); | |
| 904 _to_counters->update_all(); | |
| 905 _gen_counters->update_all(); | |
| 906 } | |
| 907 } | |
| 908 | |
| 909 void DefNewGeneration::verify(bool allow_dirty) { | |
| 910 eden()->verify(allow_dirty); | |
| 911 from()->verify(allow_dirty); | |
| 912 to()->verify(allow_dirty); | |
| 913 } | |
| 914 | |
| 915 void DefNewGeneration::print_on(outputStream* st) const { | |
| 916 Generation::print_on(st); | |
| 917 st->print(" eden"); | |
| 918 eden()->print_on(st); | |
| 919 st->print(" from"); | |
| 920 from()->print_on(st); | |
| 921 st->print(" to "); | |
| 922 to()->print_on(st); | |
| 923 } | |
| 924 | |
| 925 | |
| 926 const char* DefNewGeneration::name() const { | |
| 927 return "def new generation"; | |
| 928 } | |
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929 |
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930 // Moved from inline file as they are not called inline |
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931 CompactibleSpace* DefNewGeneration::first_compaction_space() const { |
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932 return eden(); |
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933 } |
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934 |
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935 HeapWord* DefNewGeneration::allocate(size_t word_size, |
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936 bool is_tlab) { |
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937 // This is the slow-path allocation for the DefNewGeneration. |
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938 // Most allocations are fast-path in compiled code. |
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939 // We try to allocate from the eden. If that works, we are happy. |
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940 // Note that since DefNewGeneration supports lock-free allocation, we |
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941 // have to use it here, as well. |
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942 HeapWord* result = eden()->par_allocate(word_size); |
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943 if (result != NULL) { |
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944 return result; |
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945 } |
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946 do { |
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947 HeapWord* old_limit = eden()->soft_end(); |
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948 if (old_limit < eden()->end()) { |
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949 // Tell the next generation we reached a limit. |
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950 HeapWord* new_limit = |
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951 next_gen()->allocation_limit_reached(eden(), eden()->top(), word_size); |
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952 if (new_limit != NULL) { |
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953 Atomic::cmpxchg_ptr(new_limit, eden()->soft_end_addr(), old_limit); |
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954 } else { |
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955 assert(eden()->soft_end() == eden()->end(), |
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956 "invalid state after allocation_limit_reached returned null"); |
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957 } |
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958 } else { |
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959 // The allocation failed and the soft limit is equal to the hard limit, |
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960 // there are no reasons to do an attempt to allocate |
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961 assert(old_limit == eden()->end(), "sanity check"); |
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962 break; |
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963 } |
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964 // Try to allocate until succeeded or the soft limit can't be adjusted |
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965 result = eden()->par_allocate(word_size); |
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966 } while (result == NULL); |
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967 |
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968 // If the eden is full and the last collection bailed out, we are running |
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969 // out of heap space, and we try to allocate the from-space, too. |
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970 // allocate_from_space can't be inlined because that would introduce a |
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971 // circular dependency at compile time. |
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972 if (result == NULL) { |
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973 result = allocate_from_space(word_size); |
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974 } |
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975 return result; |
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976 } |
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977 |
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978 HeapWord* DefNewGeneration::par_allocate(size_t word_size, |
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979 bool is_tlab) { |
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980 return eden()->par_allocate(word_size); |
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981 } |
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982 |
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983 void DefNewGeneration::gc_prologue(bool full) { |
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984 // Ensure that _end and _soft_end are the same in eden space. |
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985 eden()->set_soft_end(eden()->end()); |
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986 } |
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987 |
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988 size_t DefNewGeneration::tlab_capacity() const { |
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989 return eden()->capacity(); |
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990 } |
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991 |
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992 size_t DefNewGeneration::unsafe_max_tlab_alloc() const { |
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993 return unsafe_max_alloc_nogc(); |
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994 } |