Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 1131:40e7c1d24e4a
6909153: Fix broken options on Zero
Summary: Smaller fixes to ensure that Zero still works with non-standard options.
Reviewed-by: twisti
Contributed-by: Gary Benson <gbenson@redhat.com>
| author | twisti |
|---|---|
| date | Mon, 04 Jan 2010 00:22:57 -0800 |
| parents | 39b01ab7035a |
| children | 7b0e9cba0307 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_parallelScavengeHeap.cpp.incl" | |
| 27 | |
| 28 PSYoungGen* ParallelScavengeHeap::_young_gen = NULL; | |
| 29 PSOldGen* ParallelScavengeHeap::_old_gen = NULL; | |
| 30 PSPermGen* ParallelScavengeHeap::_perm_gen = NULL; | |
| 31 PSAdaptiveSizePolicy* ParallelScavengeHeap::_size_policy = NULL; | |
| 32 PSGCAdaptivePolicyCounters* ParallelScavengeHeap::_gc_policy_counters = NULL; | |
| 33 ParallelScavengeHeap* ParallelScavengeHeap::_psh = NULL; | |
| 34 GCTaskManager* ParallelScavengeHeap::_gc_task_manager = NULL; | |
| 35 | |
| 36 static void trace_gen_sizes(const char* const str, | |
| 37 size_t pg_min, size_t pg_max, | |
| 38 size_t og_min, size_t og_max, | |
| 39 size_t yg_min, size_t yg_max) | |
| 40 { | |
| 41 if (TracePageSizes) { | |
| 42 tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " " | |
| 43 SIZE_FORMAT "," SIZE_FORMAT " " | |
| 44 SIZE_FORMAT "," SIZE_FORMAT " " | |
| 45 SIZE_FORMAT, | |
| 46 str, pg_min / K, pg_max / K, | |
| 47 og_min / K, og_max / K, | |
| 48 yg_min / K, yg_max / K, | |
| 49 (pg_max + og_max + yg_max) / K); | |
| 50 } | |
| 51 } | |
| 52 | |
| 53 jint ParallelScavengeHeap::initialize() { | |
| 54 // Cannot be initialized until after the flags are parsed | |
| 55 GenerationSizer flag_parser; | |
| 56 | |
| 57 size_t yg_min_size = flag_parser.min_young_gen_size(); | |
| 58 size_t yg_max_size = flag_parser.max_young_gen_size(); | |
| 59 size_t og_min_size = flag_parser.min_old_gen_size(); | |
| 60 size_t og_max_size = flag_parser.max_old_gen_size(); | |
| 61 // Why isn't there a min_perm_gen_size()? | |
| 62 size_t pg_min_size = flag_parser.perm_gen_size(); | |
| 63 size_t pg_max_size = flag_parser.max_perm_gen_size(); | |
| 64 | |
| 65 trace_gen_sizes("ps heap raw", | |
| 66 pg_min_size, pg_max_size, | |
| 67 og_min_size, og_max_size, | |
| 68 yg_min_size, yg_max_size); | |
| 69 | |
| 70 // The ReservedSpace ctor used below requires that the page size for the perm | |
| 71 // gen is <= the page size for the rest of the heap (young + old gens). | |
| 72 const size_t og_page_sz = os::page_size_for_region(yg_min_size + og_min_size, | |
| 73 yg_max_size + og_max_size, | |
| 74 8); | |
| 75 const size_t pg_page_sz = MIN2(os::page_size_for_region(pg_min_size, | |
| 76 pg_max_size, 16), | |
| 77 og_page_sz); | |
| 78 | |
| 79 const size_t pg_align = set_alignment(_perm_gen_alignment, pg_page_sz); | |
| 80 const size_t og_align = set_alignment(_old_gen_alignment, og_page_sz); | |
| 81 const size_t yg_align = set_alignment(_young_gen_alignment, og_page_sz); | |
| 82 | |
| 83 // Update sizes to reflect the selected page size(s). | |
| 84 // | |
| 85 // NEEDS_CLEANUP. The default TwoGenerationCollectorPolicy uses NewRatio; it | |
| 86 // should check UseAdaptiveSizePolicy. Changes from generationSizer could | |
| 87 // move to the common code. | |
| 88 yg_min_size = align_size_up(yg_min_size, yg_align); | |
| 89 yg_max_size = align_size_up(yg_max_size, yg_align); | |
| 90 size_t yg_cur_size = align_size_up(flag_parser.young_gen_size(), yg_align); | |
| 91 yg_cur_size = MAX2(yg_cur_size, yg_min_size); | |
| 92 | |
| 93 og_min_size = align_size_up(og_min_size, og_align); | |
| 94 og_max_size = align_size_up(og_max_size, og_align); | |
| 95 size_t og_cur_size = align_size_up(flag_parser.old_gen_size(), og_align); | |
| 96 og_cur_size = MAX2(og_cur_size, og_min_size); | |
| 97 | |
| 98 pg_min_size = align_size_up(pg_min_size, pg_align); | |
| 99 pg_max_size = align_size_up(pg_max_size, pg_align); | |
| 100 size_t pg_cur_size = pg_min_size; | |
| 101 | |
| 102 trace_gen_sizes("ps heap rnd", | |
| 103 pg_min_size, pg_max_size, | |
| 104 og_min_size, og_max_size, | |
| 105 yg_min_size, yg_max_size); | |
| 106 | |
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107 const size_t total_reserved = pg_max_size + og_max_size + yg_max_size; |
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108 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); |
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109 |
| 0 | 110 // The main part of the heap (old gen + young gen) can often use a larger page |
| 111 // size than is needed or wanted for the perm gen. Use the "compound | |
| 112 // alignment" ReservedSpace ctor to avoid having to use the same page size for | |
| 113 // all gens. | |
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114 |
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115 ReservedHeapSpace heap_rs(pg_max_size, pg_align, og_max_size + yg_max_size, |
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116 og_align, addr); |
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117 |
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118 if (UseCompressedOops) { |
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119 if (addr != NULL && !heap_rs.is_reserved()) { |
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120 // Failed to reserve at specified address - the requested memory |
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121 // region is taken already, for example, by 'java' launcher. |
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122 // Try again to reserver heap higher. |
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123 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); |
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124 ReservedHeapSpace heap_rs0(pg_max_size, pg_align, og_max_size + yg_max_size, |
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125 og_align, addr); |
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126 if (addr != NULL && !heap_rs0.is_reserved()) { |
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127 // Failed to reserve at specified address again - give up. |
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128 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); |
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129 assert(addr == NULL, ""); |
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130 ReservedHeapSpace heap_rs1(pg_max_size, pg_align, og_max_size + yg_max_size, |
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131 og_align, addr); |
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132 heap_rs = heap_rs1; |
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133 } else { |
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134 heap_rs = heap_rs0; |
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135 } |
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136 } |
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137 } |
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138 |
| 0 | 139 os::trace_page_sizes("ps perm", pg_min_size, pg_max_size, pg_page_sz, |
| 140 heap_rs.base(), pg_max_size); | |
| 141 os::trace_page_sizes("ps main", og_min_size + yg_min_size, | |
| 142 og_max_size + yg_max_size, og_page_sz, | |
| 143 heap_rs.base() + pg_max_size, | |
| 144 heap_rs.size() - pg_max_size); | |
| 145 if (!heap_rs.is_reserved()) { | |
| 146 vm_shutdown_during_initialization( | |
| 147 "Could not reserve enough space for object heap"); | |
| 148 return JNI_ENOMEM; | |
| 149 } | |
| 150 | |
| 151 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
| 152 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 153 | |
| 154 CardTableExtension* const barrier_set = new CardTableExtension(_reserved, 3); | |
| 155 _barrier_set = barrier_set; | |
| 156 oopDesc::set_bs(_barrier_set); | |
| 157 if (_barrier_set == NULL) { | |
| 158 vm_shutdown_during_initialization( | |
| 159 "Could not reserve enough space for barrier set"); | |
| 160 return JNI_ENOMEM; | |
| 161 } | |
| 162 | |
| 163 // Initial young gen size is 4 Mb | |
| 164 // | |
| 165 // XXX - what about flag_parser.young_gen_size()? | |
| 166 const size_t init_young_size = align_size_up(4 * M, yg_align); | |
| 167 yg_cur_size = MAX2(MIN2(init_young_size, yg_max_size), yg_cur_size); | |
| 168 | |
| 169 // Split the reserved space into perm gen and the main heap (everything else). | |
| 170 // The main heap uses a different alignment. | |
| 171 ReservedSpace perm_rs = heap_rs.first_part(pg_max_size); | |
| 172 ReservedSpace main_rs = heap_rs.last_part(pg_max_size, og_align); | |
| 173 | |
| 174 // Make up the generations | |
| 175 // Calculate the maximum size that a generation can grow. This | |
| 176 // includes growth into the other generation. Note that the | |
| 177 // parameter _max_gen_size is kept as the maximum | |
| 178 // size of the generation as the boundaries currently stand. | |
| 179 // _max_gen_size is still used as that value. | |
| 180 double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; | |
| 181 double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; | |
| 182 | |
| 183 _gens = new AdjoiningGenerations(main_rs, | |
| 184 og_cur_size, | |
| 185 og_min_size, | |
| 186 og_max_size, | |
| 187 yg_cur_size, | |
| 188 yg_min_size, | |
| 189 yg_max_size, | |
| 190 yg_align); | |
| 191 | |
| 192 _old_gen = _gens->old_gen(); | |
| 193 _young_gen = _gens->young_gen(); | |
| 194 | |
| 195 const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes(); | |
| 196 const size_t old_capacity = _old_gen->capacity_in_bytes(); | |
| 197 const size_t initial_promo_size = MIN2(eden_capacity, old_capacity); | |
| 198 _size_policy = | |
| 199 new PSAdaptiveSizePolicy(eden_capacity, | |
| 200 initial_promo_size, | |
| 201 young_gen()->to_space()->capacity_in_bytes(), | |
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202 intra_heap_alignment(), |
| 0 | 203 max_gc_pause_sec, |
| 204 max_gc_minor_pause_sec, | |
| 205 GCTimeRatio | |
| 206 ); | |
| 207 | |
| 208 _perm_gen = new PSPermGen(perm_rs, | |
| 209 pg_align, | |
| 210 pg_cur_size, | |
| 211 pg_cur_size, | |
| 212 pg_max_size, | |
| 213 "perm", 2); | |
| 214 | |
| 215 assert(!UseAdaptiveGCBoundary || | |
| 216 (old_gen()->virtual_space()->high_boundary() == | |
| 217 young_gen()->virtual_space()->low_boundary()), | |
| 218 "Boundaries must meet"); | |
| 219 // initialize the policy counters - 2 collectors, 3 generations | |
| 220 _gc_policy_counters = | |
| 221 new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy); | |
| 222 _psh = this; | |
| 223 | |
| 224 // Set up the GCTaskManager | |
| 225 _gc_task_manager = GCTaskManager::create(ParallelGCThreads); | |
| 226 | |
| 227 if (UseParallelOldGC && !PSParallelCompact::initialize()) { | |
| 228 return JNI_ENOMEM; | |
| 229 } | |
| 230 | |
| 231 return JNI_OK; | |
| 232 } | |
| 233 | |
| 234 void ParallelScavengeHeap::post_initialize() { | |
| 235 // Need to init the tenuring threshold | |
| 236 PSScavenge::initialize(); | |
| 237 if (UseParallelOldGC) { | |
| 238 PSParallelCompact::post_initialize(); | |
| 239 } else { | |
| 240 PSMarkSweep::initialize(); | |
| 241 } | |
| 242 PSPromotionManager::initialize(); | |
| 243 } | |
| 244 | |
| 245 void ParallelScavengeHeap::update_counters() { | |
| 246 young_gen()->update_counters(); | |
| 247 old_gen()->update_counters(); | |
| 248 perm_gen()->update_counters(); | |
| 249 } | |
| 250 | |
| 251 size_t ParallelScavengeHeap::capacity() const { | |
| 252 size_t value = young_gen()->capacity_in_bytes() + old_gen()->capacity_in_bytes(); | |
| 253 return value; | |
| 254 } | |
| 255 | |
| 256 size_t ParallelScavengeHeap::used() const { | |
| 257 size_t value = young_gen()->used_in_bytes() + old_gen()->used_in_bytes(); | |
| 258 return value; | |
| 259 } | |
| 260 | |
| 261 bool ParallelScavengeHeap::is_maximal_no_gc() const { | |
| 262 return old_gen()->is_maximal_no_gc() && young_gen()->is_maximal_no_gc(); | |
| 263 } | |
| 264 | |
| 265 | |
| 266 size_t ParallelScavengeHeap::permanent_capacity() const { | |
| 267 return perm_gen()->capacity_in_bytes(); | |
| 268 } | |
| 269 | |
| 270 size_t ParallelScavengeHeap::permanent_used() const { | |
| 271 return perm_gen()->used_in_bytes(); | |
| 272 } | |
| 273 | |
| 274 size_t ParallelScavengeHeap::max_capacity() const { | |
| 275 size_t estimated = reserved_region().byte_size(); | |
| 276 estimated -= perm_gen()->reserved().byte_size(); | |
| 277 if (UseAdaptiveSizePolicy) { | |
| 278 estimated -= _size_policy->max_survivor_size(young_gen()->max_size()); | |
| 279 } else { | |
| 280 estimated -= young_gen()->to_space()->capacity_in_bytes(); | |
| 281 } | |
| 282 return MAX2(estimated, capacity()); | |
| 283 } | |
| 284 | |
| 285 bool ParallelScavengeHeap::is_in(const void* p) const { | |
| 286 if (young_gen()->is_in(p)) { | |
| 287 return true; | |
| 288 } | |
| 289 | |
| 290 if (old_gen()->is_in(p)) { | |
| 291 return true; | |
| 292 } | |
| 293 | |
| 294 if (perm_gen()->is_in(p)) { | |
| 295 return true; | |
| 296 } | |
| 297 | |
| 298 return false; | |
| 299 } | |
| 300 | |
| 301 bool ParallelScavengeHeap::is_in_reserved(const void* p) const { | |
| 302 if (young_gen()->is_in_reserved(p)) { | |
| 303 return true; | |
| 304 } | |
| 305 | |
| 306 if (old_gen()->is_in_reserved(p)) { | |
| 307 return true; | |
| 308 } | |
| 309 | |
| 310 if (perm_gen()->is_in_reserved(p)) { | |
| 311 return true; | |
| 312 } | |
| 313 | |
| 314 return false; | |
| 315 } | |
| 316 | |
| 317 // There are two levels of allocation policy here. | |
| 318 // | |
| 319 // When an allocation request fails, the requesting thread must invoke a VM | |
| 320 // operation, transfer control to the VM thread, and await the results of a | |
| 321 // garbage collection. That is quite expensive, and we should avoid doing it | |
| 322 // multiple times if possible. | |
| 323 // | |
| 324 // To accomplish this, we have a basic allocation policy, and also a | |
| 325 // failed allocation policy. | |
| 326 // | |
| 327 // The basic allocation policy controls how you allocate memory without | |
| 328 // attempting garbage collection. It is okay to grab locks and | |
| 329 // expand the heap, if that can be done without coming to a safepoint. | |
| 330 // It is likely that the basic allocation policy will not be very | |
| 331 // aggressive. | |
| 332 // | |
| 333 // The failed allocation policy is invoked from the VM thread after | |
| 334 // the basic allocation policy is unable to satisfy a mem_allocate | |
| 335 // request. This policy needs to cover the entire range of collection, | |
| 336 // heap expansion, and out-of-memory conditions. It should make every | |
| 337 // attempt to allocate the requested memory. | |
| 338 | |
| 339 // Basic allocation policy. Should never be called at a safepoint, or | |
| 340 // from the VM thread. | |
| 341 // | |
| 342 // This method must handle cases where many mem_allocate requests fail | |
| 343 // simultaneously. When that happens, only one VM operation will succeed, | |
| 344 // and the rest will not be executed. For that reason, this method loops | |
| 345 // during failed allocation attempts. If the java heap becomes exhausted, | |
| 346 // we rely on the size_policy object to force a bail out. | |
| 347 HeapWord* ParallelScavengeHeap::mem_allocate( | |
| 348 size_t size, | |
| 349 bool is_noref, | |
| 350 bool is_tlab, | |
| 351 bool* gc_overhead_limit_was_exceeded) { | |
| 352 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
| 353 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
| 354 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 355 | |
| 356 HeapWord* result = young_gen()->allocate(size, is_tlab); | |
| 357 | |
| 358 uint loop_count = 0; | |
| 359 uint gc_count = 0; | |
| 360 | |
| 361 while (result == NULL) { | |
| 362 // We don't want to have multiple collections for a single filled generation. | |
| 363 // To prevent this, each thread tracks the total_collections() value, and if | |
| 364 // the count has changed, does not do a new collection. | |
| 365 // | |
| 366 // The collection count must be read only while holding the heap lock. VM | |
| 367 // operations also hold the heap lock during collections. There is a lock | |
| 368 // contention case where thread A blocks waiting on the Heap_lock, while | |
| 369 // thread B is holding it doing a collection. When thread A gets the lock, | |
| 370 // the collection count has already changed. To prevent duplicate collections, | |
| 371 // The policy MUST attempt allocations during the same period it reads the | |
| 372 // total_collections() value! | |
| 373 { | |
| 374 MutexLocker ml(Heap_lock); | |
| 375 gc_count = Universe::heap()->total_collections(); | |
| 376 | |
| 377 result = young_gen()->allocate(size, is_tlab); | |
| 378 | |
| 379 // (1) If the requested object is too large to easily fit in the | |
| 380 // young_gen, or | |
| 381 // (2) If GC is locked out via GCLocker, young gen is full and | |
| 382 // the need for a GC already signalled to GCLocker (done | |
| 383 // at a safepoint), | |
| 384 // ... then, rather than force a safepoint and (a potentially futile) | |
| 385 // collection (attempt) for each allocation, try allocation directly | |
| 386 // in old_gen. For case (2) above, we may in the future allow | |
| 387 // TLAB allocation directly in the old gen. | |
| 388 if (result != NULL) { | |
| 389 return result; | |
| 390 } | |
| 391 if (!is_tlab && | |
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392 size >= (young_gen()->eden_space()->capacity_in_words(Thread::current()) / 2)) { |
| 0 | 393 result = old_gen()->allocate(size, is_tlab); |
| 394 if (result != NULL) { | |
| 395 return result; | |
| 396 } | |
| 397 } | |
| 398 if (GC_locker::is_active_and_needs_gc()) { | |
| 399 // GC is locked out. If this is a TLAB allocation, | |
| 400 // return NULL; the requestor will retry allocation | |
| 401 // of an idividual object at a time. | |
| 402 if (is_tlab) { | |
| 403 return NULL; | |
| 404 } | |
| 405 | |
| 406 // If this thread is not in a jni critical section, we stall | |
| 407 // the requestor until the critical section has cleared and | |
| 408 // GC allowed. When the critical section clears, a GC is | |
| 409 // initiated by the last thread exiting the critical section; so | |
| 410 // we retry the allocation sequence from the beginning of the loop, | |
| 411 // rather than causing more, now probably unnecessary, GC attempts. | |
| 412 JavaThread* jthr = JavaThread::current(); | |
| 413 if (!jthr->in_critical()) { | |
| 414 MutexUnlocker mul(Heap_lock); | |
| 415 GC_locker::stall_until_clear(); | |
| 416 continue; | |
| 417 } else { | |
| 418 if (CheckJNICalls) { | |
| 419 fatal("Possible deadlock due to allocating while" | |
| 420 " in jni critical section"); | |
| 421 } | |
| 422 return NULL; | |
| 423 } | |
| 424 } | |
| 425 } | |
| 426 | |
| 427 if (result == NULL) { | |
| 428 | |
| 429 // Exit the loop if if the gc time limit has been exceeded. | |
| 430 // The allocation must have failed above (result must be NULL), | |
| 431 // and the most recent collection must have exceeded the | |
| 432 // gc time limit. Exit the loop so that an out-of-memory | |
| 433 // will be thrown (returning a NULL will do that), but | |
| 434 // clear gc_time_limit_exceeded so that the next collection | |
| 435 // will succeeded if the applications decides to handle the | |
| 436 // out-of-memory and tries to go on. | |
| 437 *gc_overhead_limit_was_exceeded = size_policy()->gc_time_limit_exceeded(); | |
| 438 if (size_policy()->gc_time_limit_exceeded()) { | |
| 439 size_policy()->set_gc_time_limit_exceeded(false); | |
| 440 if (PrintGCDetails && Verbose) { | |
| 441 gclog_or_tty->print_cr("ParallelScavengeHeap::mem_allocate: " | |
| 442 "return NULL because gc_time_limit_exceeded is set"); | |
| 443 } | |
| 444 return NULL; | |
| 445 } | |
| 446 | |
| 447 // Generate a VM operation | |
| 448 VM_ParallelGCFailedAllocation op(size, is_tlab, gc_count); | |
| 449 VMThread::execute(&op); | |
| 450 | |
| 451 // Did the VM operation execute? If so, return the result directly. | |
| 452 // This prevents us from looping until time out on requests that can | |
| 453 // not be satisfied. | |
| 454 if (op.prologue_succeeded()) { | |
| 455 assert(Universe::heap()->is_in_or_null(op.result()), | |
| 456 "result not in heap"); | |
| 457 | |
| 458 // If GC was locked out during VM operation then retry allocation | |
| 459 // and/or stall as necessary. | |
| 460 if (op.gc_locked()) { | |
| 461 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); | |
| 462 continue; // retry and/or stall as necessary | |
| 463 } | |
| 464 // If a NULL result is being returned, an out-of-memory | |
| 465 // will be thrown now. Clear the gc_time_limit_exceeded | |
| 466 // flag to avoid the following situation. | |
| 467 // gc_time_limit_exceeded is set during a collection | |
| 468 // the collection fails to return enough space and an OOM is thrown | |
| 469 // the next GC is skipped because the gc_time_limit_exceeded | |
| 470 // flag is set and another OOM is thrown | |
| 471 if (op.result() == NULL) { | |
| 472 size_policy()->set_gc_time_limit_exceeded(false); | |
| 473 } | |
| 474 return op.result(); | |
| 475 } | |
| 476 } | |
| 477 | |
| 478 // The policy object will prevent us from looping forever. If the | |
| 479 // time spent in gc crosses a threshold, we will bail out. | |
| 480 loop_count++; | |
| 481 if ((result == NULL) && (QueuedAllocationWarningCount > 0) && | |
| 482 (loop_count % QueuedAllocationWarningCount == 0)) { | |
| 483 warning("ParallelScavengeHeap::mem_allocate retries %d times \n\t" | |
| 484 " size=%d %s", loop_count, size, is_tlab ? "(TLAB)" : ""); | |
| 485 } | |
| 486 } | |
| 487 | |
| 488 return result; | |
| 489 } | |
| 490 | |
| 491 // Failed allocation policy. Must be called from the VM thread, and | |
| 492 // only at a safepoint! Note that this method has policy for allocation | |
| 493 // flow, and NOT collection policy. So we do not check for gc collection | |
| 494 // time over limit here, that is the responsibility of the heap specific | |
| 495 // collection methods. This method decides where to attempt allocations, | |
| 496 // and when to attempt collections, but no collection specific policy. | |
| 497 HeapWord* ParallelScavengeHeap::failed_mem_allocate(size_t size, bool is_tlab) { | |
| 498 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 499 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 500 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
| 501 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 502 | |
| 503 size_t mark_sweep_invocation_count = total_invocations(); | |
| 504 | |
| 505 // We assume (and assert!) that an allocation at this point will fail | |
| 506 // unless we collect. | |
| 507 | |
| 508 // First level allocation failure, scavenge and allocate in young gen. | |
| 509 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
| 510 PSScavenge::invoke(); | |
| 511 HeapWord* result = young_gen()->allocate(size, is_tlab); | |
| 512 | |
| 513 // Second level allocation failure. | |
| 514 // Mark sweep and allocate in young generation. | |
| 515 if (result == NULL) { | |
| 516 // There is some chance the scavenge method decided to invoke mark_sweep. | |
| 517 // Don't mark sweep twice if so. | |
| 518 if (mark_sweep_invocation_count == total_invocations()) { | |
| 519 invoke_full_gc(false); | |
| 520 result = young_gen()->allocate(size, is_tlab); | |
| 521 } | |
| 522 } | |
| 523 | |
| 524 // Third level allocation failure. | |
| 525 // After mark sweep and young generation allocation failure, | |
| 526 // allocate in old generation. | |
| 527 if (result == NULL && !is_tlab) { | |
| 528 result = old_gen()->allocate(size, is_tlab); | |
| 529 } | |
| 530 | |
| 531 // Fourth level allocation failure. We're running out of memory. | |
| 532 // More complete mark sweep and allocate in young generation. | |
| 533 if (result == NULL) { | |
| 534 invoke_full_gc(true); | |
| 535 result = young_gen()->allocate(size, is_tlab); | |
| 536 } | |
| 537 | |
| 538 // Fifth level allocation failure. | |
| 539 // After more complete mark sweep, allocate in old generation. | |
| 540 if (result == NULL && !is_tlab) { | |
| 541 result = old_gen()->allocate(size, is_tlab); | |
| 542 } | |
| 543 | |
| 544 return result; | |
| 545 } | |
| 546 | |
| 547 // | |
| 548 // This is the policy loop for allocating in the permanent generation. | |
| 549 // If the initial allocation fails, we create a vm operation which will | |
| 550 // cause a collection. | |
| 551 HeapWord* ParallelScavengeHeap::permanent_mem_allocate(size_t size) { | |
| 552 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
| 553 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
| 554 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 555 | |
| 556 HeapWord* result; | |
| 557 | |
| 558 uint loop_count = 0; | |
| 559 uint gc_count = 0; | |
| 560 uint full_gc_count = 0; | |
| 561 | |
| 562 do { | |
| 563 // We don't want to have multiple collections for a single filled generation. | |
| 564 // To prevent this, each thread tracks the total_collections() value, and if | |
| 565 // the count has changed, does not do a new collection. | |
| 566 // | |
| 567 // The collection count must be read only while holding the heap lock. VM | |
| 568 // operations also hold the heap lock during collections. There is a lock | |
| 569 // contention case where thread A blocks waiting on the Heap_lock, while | |
| 570 // thread B is holding it doing a collection. When thread A gets the lock, | |
| 571 // the collection count has already changed. To prevent duplicate collections, | |
| 572 // The policy MUST attempt allocations during the same period it reads the | |
| 573 // total_collections() value! | |
| 574 { | |
| 575 MutexLocker ml(Heap_lock); | |
| 576 gc_count = Universe::heap()->total_collections(); | |
| 577 full_gc_count = Universe::heap()->total_full_collections(); | |
| 578 | |
| 579 result = perm_gen()->allocate_permanent(size); | |
|
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580 |
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581 if (result != NULL) { |
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582 return result; |
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583 } |
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584 |
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585 if (GC_locker::is_active_and_needs_gc()) { |
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586 // If this thread is not in a jni critical section, we stall |
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587 // the requestor until the critical section has cleared and |
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588 // GC allowed. When the critical section clears, a GC is |
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589 // initiated by the last thread exiting the critical section; so |
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590 // we retry the allocation sequence from the beginning of the loop, |
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591 // rather than causing more, now probably unnecessary, GC attempts. |
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592 JavaThread* jthr = JavaThread::current(); |
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593 if (!jthr->in_critical()) { |
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594 MutexUnlocker mul(Heap_lock); |
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595 GC_locker::stall_until_clear(); |
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596 continue; |
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597 } else { |
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598 if (CheckJNICalls) { |
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599 fatal("Possible deadlock due to allocating while" |
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600 " in jni critical section"); |
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601 } |
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602 return NULL; |
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603 } |
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604 } |
| 0 | 605 } |
| 606 | |
| 607 if (result == NULL) { | |
| 608 | |
| 609 // Exit the loop if the gc time limit has been exceeded. | |
| 610 // The allocation must have failed above (result must be NULL), | |
| 611 // and the most recent collection must have exceeded the | |
| 612 // gc time limit. Exit the loop so that an out-of-memory | |
| 613 // will be thrown (returning a NULL will do that), but | |
| 614 // clear gc_time_limit_exceeded so that the next collection | |
| 615 // will succeeded if the applications decides to handle the | |
| 616 // out-of-memory and tries to go on. | |
| 617 if (size_policy()->gc_time_limit_exceeded()) { | |
| 618 size_policy()->set_gc_time_limit_exceeded(false); | |
| 619 if (PrintGCDetails && Verbose) { | |
| 620 gclog_or_tty->print_cr("ParallelScavengeHeap::permanent_mem_allocate: " | |
| 621 "return NULL because gc_time_limit_exceeded is set"); | |
| 622 } | |
| 623 assert(result == NULL, "Allocation did not fail"); | |
| 624 return NULL; | |
| 625 } | |
| 626 | |
| 627 // Generate a VM operation | |
| 628 VM_ParallelGCFailedPermanentAllocation op(size, gc_count, full_gc_count); | |
| 629 VMThread::execute(&op); | |
| 630 | |
| 631 // Did the VM operation execute? If so, return the result directly. | |
| 632 // This prevents us from looping until time out on requests that can | |
| 633 // not be satisfied. | |
| 634 if (op.prologue_succeeded()) { | |
| 635 assert(Universe::heap()->is_in_permanent_or_null(op.result()), | |
| 636 "result not in heap"); | |
|
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637 // If GC was locked out during VM operation then retry allocation |
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638 // and/or stall as necessary. |
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639 if (op.gc_locked()) { |
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640 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); |
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641 continue; // retry and/or stall as necessary |
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642 } |
| 0 | 643 // If a NULL results is being returned, an out-of-memory |
| 644 // will be thrown now. Clear the gc_time_limit_exceeded | |
| 645 // flag to avoid the following situation. | |
| 646 // gc_time_limit_exceeded is set during a collection | |
| 647 // the collection fails to return enough space and an OOM is thrown | |
| 648 // the next GC is skipped because the gc_time_limit_exceeded | |
| 649 // flag is set and another OOM is thrown | |
| 650 if (op.result() == NULL) { | |
| 651 size_policy()->set_gc_time_limit_exceeded(false); | |
| 652 } | |
| 653 return op.result(); | |
| 654 } | |
| 655 } | |
| 656 | |
| 657 // The policy object will prevent us from looping forever. If the | |
| 658 // time spent in gc crosses a threshold, we will bail out. | |
| 659 loop_count++; | |
| 660 if ((QueuedAllocationWarningCount > 0) && | |
| 661 (loop_count % QueuedAllocationWarningCount == 0)) { | |
| 662 warning("ParallelScavengeHeap::permanent_mem_allocate retries %d times \n\t" | |
| 663 " size=%d", loop_count, size); | |
| 664 } | |
| 665 } while (result == NULL); | |
| 666 | |
| 667 return result; | |
| 668 } | |
| 669 | |
| 670 // | |
| 671 // This is the policy code for permanent allocations which have failed | |
| 672 // and require a collection. Note that just as in failed_mem_allocate, | |
| 673 // we do not set collection policy, only where & when to allocate and | |
| 674 // collect. | |
| 675 HeapWord* ParallelScavengeHeap::failed_permanent_mem_allocate(size_t size) { | |
| 676 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); | |
| 677 assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread"); | |
| 678 assert(!Universe::heap()->is_gc_active(), "not reentrant"); | |
| 679 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 680 assert(size > perm_gen()->free_in_words(), "Allocation should fail"); | |
| 681 | |
| 682 // We assume (and assert!) that an allocation at this point will fail | |
| 683 // unless we collect. | |
| 684 | |
| 685 // First level allocation failure. Mark-sweep and allocate in perm gen. | |
| 686 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
| 687 invoke_full_gc(false); | |
| 688 HeapWord* result = perm_gen()->allocate_permanent(size); | |
| 689 | |
| 690 // Second level allocation failure. We're running out of memory. | |
| 691 if (result == NULL) { | |
| 692 invoke_full_gc(true); | |
| 693 result = perm_gen()->allocate_permanent(size); | |
| 694 } | |
| 695 | |
| 696 return result; | |
| 697 } | |
| 698 | |
| 699 void ParallelScavengeHeap::ensure_parsability(bool retire_tlabs) { | |
| 700 CollectedHeap::ensure_parsability(retire_tlabs); | |
| 701 young_gen()->eden_space()->ensure_parsability(); | |
| 702 } | |
| 703 | |
| 704 size_t ParallelScavengeHeap::unsafe_max_alloc() { | |
| 705 return young_gen()->eden_space()->free_in_bytes(); | |
| 706 } | |
| 707 | |
| 708 size_t ParallelScavengeHeap::tlab_capacity(Thread* thr) const { | |
| 709 return young_gen()->eden_space()->tlab_capacity(thr); | |
| 710 } | |
| 711 | |
| 712 size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
| 713 return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr); | |
| 714 } | |
| 715 | |
| 716 HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) { | |
| 717 return young_gen()->allocate(size, true); | |
| 718 } | |
| 719 | |
| 720 void ParallelScavengeHeap::fill_all_tlabs(bool retire) { | |
| 721 CollectedHeap::fill_all_tlabs(retire); | |
| 722 } | |
| 723 | |
| 724 void ParallelScavengeHeap::accumulate_statistics_all_tlabs() { | |
| 725 CollectedHeap::accumulate_statistics_all_tlabs(); | |
| 726 } | |
| 727 | |
| 728 void ParallelScavengeHeap::resize_all_tlabs() { | |
| 729 CollectedHeap::resize_all_tlabs(); | |
| 730 } | |
| 731 | |
|
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732 bool ParallelScavengeHeap::can_elide_initializing_store_barrier(oop new_obj) { |
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733 // We don't need barriers for stores to objects in the |
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734 // young gen and, a fortiori, for initializing stores to |
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735 // objects therein. |
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736 return is_in_young(new_obj); |
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737 } |
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738 |
| 0 | 739 // This method is used by System.gc() and JVMTI. |
| 740 void ParallelScavengeHeap::collect(GCCause::Cause cause) { | |
| 741 assert(!Heap_lock->owned_by_self(), | |
| 742 "this thread should not own the Heap_lock"); | |
| 743 | |
| 744 unsigned int gc_count = 0; | |
| 745 unsigned int full_gc_count = 0; | |
| 746 { | |
| 747 MutexLocker ml(Heap_lock); | |
| 748 // This value is guarded by the Heap_lock | |
| 749 gc_count = Universe::heap()->total_collections(); | |
| 750 full_gc_count = Universe::heap()->total_full_collections(); | |
| 751 } | |
| 752 | |
| 753 VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause); | |
| 754 VMThread::execute(&op); | |
| 755 } | |
| 756 | |
| 757 // This interface assumes that it's being called by the | |
| 758 // vm thread. It collects the heap assuming that the | |
| 759 // heap lock is already held and that we are executing in | |
| 760 // the context of the vm thread. | |
| 761 void ParallelScavengeHeap::collect_as_vm_thread(GCCause::Cause cause) { | |
| 762 assert(Thread::current()->is_VM_thread(), "Precondition#1"); | |
| 763 assert(Heap_lock->is_locked(), "Precondition#2"); | |
| 764 GCCauseSetter gcs(this, cause); | |
| 765 switch (cause) { | |
| 766 case GCCause::_heap_inspection: | |
| 767 case GCCause::_heap_dump: { | |
| 768 HandleMark hm; | |
| 769 invoke_full_gc(false); | |
| 770 break; | |
| 771 } | |
| 772 default: // XXX FIX ME | |
| 773 ShouldNotReachHere(); | |
| 774 } | |
| 775 } | |
| 776 | |
| 777 | |
| 778 void ParallelScavengeHeap::oop_iterate(OopClosure* cl) { | |
| 779 Unimplemented(); | |
| 780 } | |
| 781 | |
| 782 void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) { | |
| 783 young_gen()->object_iterate(cl); | |
| 784 old_gen()->object_iterate(cl); | |
| 785 perm_gen()->object_iterate(cl); | |
| 786 } | |
| 787 | |
| 788 void ParallelScavengeHeap::permanent_oop_iterate(OopClosure* cl) { | |
| 789 Unimplemented(); | |
| 790 } | |
| 791 | |
| 792 void ParallelScavengeHeap::permanent_object_iterate(ObjectClosure* cl) { | |
| 793 perm_gen()->object_iterate(cl); | |
| 794 } | |
| 795 | |
| 796 HeapWord* ParallelScavengeHeap::block_start(const void* addr) const { | |
| 797 if (young_gen()->is_in_reserved(addr)) { | |
| 798 assert(young_gen()->is_in(addr), | |
| 799 "addr should be in allocated part of young gen"); | |
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800 if (Debugging) return NULL; // called from find() in debug.cpp |
| 0 | 801 Unimplemented(); |
| 802 } else if (old_gen()->is_in_reserved(addr)) { | |
| 803 assert(old_gen()->is_in(addr), | |
| 804 "addr should be in allocated part of old gen"); | |
| 805 return old_gen()->start_array()->object_start((HeapWord*)addr); | |
| 806 } else if (perm_gen()->is_in_reserved(addr)) { | |
| 807 assert(perm_gen()->is_in(addr), | |
| 808 "addr should be in allocated part of perm gen"); | |
| 809 return perm_gen()->start_array()->object_start((HeapWord*)addr); | |
| 810 } | |
| 811 return 0; | |
| 812 } | |
| 813 | |
| 814 size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const { | |
| 815 return oop(addr)->size(); | |
| 816 } | |
| 817 | |
| 818 bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const { | |
| 819 return block_start(addr) == addr; | |
| 820 } | |
| 821 | |
| 822 jlong ParallelScavengeHeap::millis_since_last_gc() { | |
| 823 return UseParallelOldGC ? | |
| 824 PSParallelCompact::millis_since_last_gc() : | |
| 825 PSMarkSweep::millis_since_last_gc(); | |
| 826 } | |
| 827 | |
| 828 void ParallelScavengeHeap::prepare_for_verify() { | |
| 829 ensure_parsability(false); // no need to retire TLABs for verification | |
| 830 } | |
| 831 | |
| 832 void ParallelScavengeHeap::print() const { print_on(tty); } | |
| 833 | |
| 834 void ParallelScavengeHeap::print_on(outputStream* st) const { | |
| 835 young_gen()->print_on(st); | |
| 836 old_gen()->print_on(st); | |
| 837 perm_gen()->print_on(st); | |
| 838 } | |
| 839 | |
| 840 void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const { | |
| 841 PSScavenge::gc_task_manager()->threads_do(tc); | |
| 842 } | |
| 843 | |
| 844 void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const { | |
| 845 PSScavenge::gc_task_manager()->print_threads_on(st); | |
| 846 } | |
| 847 | |
| 848 void ParallelScavengeHeap::print_tracing_info() const { | |
| 849 if (TraceGen0Time) { | |
| 850 double time = PSScavenge::accumulated_time()->seconds(); | |
| 851 tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time); | |
| 852 } | |
| 853 if (TraceGen1Time) { | |
| 854 double time = PSMarkSweep::accumulated_time()->seconds(); | |
| 855 tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time); | |
| 856 } | |
| 857 } | |
| 858 | |
| 859 | |
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860 void ParallelScavengeHeap::verify(bool allow_dirty, bool silent, bool option /* ignored */) { |
| 0 | 861 // Why do we need the total_collections()-filter below? |
| 862 if (total_collections() > 0) { | |
| 863 if (!silent) { | |
| 864 gclog_or_tty->print("permanent "); | |
| 865 } | |
| 866 perm_gen()->verify(allow_dirty); | |
| 867 | |
| 868 if (!silent) { | |
| 869 gclog_or_tty->print("tenured "); | |
| 870 } | |
| 871 old_gen()->verify(allow_dirty); | |
| 872 | |
| 873 if (!silent) { | |
| 874 gclog_or_tty->print("eden "); | |
| 875 } | |
| 876 young_gen()->verify(allow_dirty); | |
| 877 } | |
| 878 if (!silent) { | |
| 879 gclog_or_tty->print("ref_proc "); | |
| 880 } | |
| 881 ReferenceProcessor::verify(); | |
| 882 } | |
| 883 | |
| 884 void ParallelScavengeHeap::print_heap_change(size_t prev_used) { | |
| 885 if (PrintGCDetails && Verbose) { | |
| 886 gclog_or_tty->print(" " SIZE_FORMAT | |
| 887 "->" SIZE_FORMAT | |
| 888 "(" SIZE_FORMAT ")", | |
| 889 prev_used, used(), capacity()); | |
| 890 } else { | |
| 891 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
| 892 "->" SIZE_FORMAT "K" | |
| 893 "(" SIZE_FORMAT "K)", | |
| 894 prev_used / K, used() / K, capacity() / K); | |
| 895 } | |
| 896 } | |
| 897 | |
| 898 ParallelScavengeHeap* ParallelScavengeHeap::heap() { | |
| 899 assert(_psh != NULL, "Uninitialized access to ParallelScavengeHeap::heap()"); | |
| 900 assert(_psh->kind() == CollectedHeap::ParallelScavengeHeap, "not a parallel scavenge heap"); | |
| 901 return _psh; | |
| 902 } | |
| 903 | |
| 904 // Before delegating the resize to the young generation, | |
| 905 // the reserved space for the young and old generations | |
| 906 // may be changed to accomodate the desired resize. | |
| 907 void ParallelScavengeHeap::resize_young_gen(size_t eden_size, | |
| 908 size_t survivor_size) { | |
| 909 if (UseAdaptiveGCBoundary) { | |
| 910 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
| 911 size_policy()->reset_bytes_absorbed_from_eden(); | |
| 912 return; // The generation changed size already. | |
| 913 } | |
| 914 gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size); | |
| 915 } | |
| 916 | |
| 917 // Delegate the resize to the generation. | |
| 918 _young_gen->resize(eden_size, survivor_size); | |
| 919 } | |
| 920 | |
| 921 // Before delegating the resize to the old generation, | |
| 922 // the reserved space for the young and old generations | |
| 923 // may be changed to accomodate the desired resize. | |
| 924 void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) { | |
| 925 if (UseAdaptiveGCBoundary) { | |
| 926 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
| 927 size_policy()->reset_bytes_absorbed_from_eden(); | |
| 928 return; // The generation changed size already. | |
| 929 } | |
| 930 gens()->adjust_boundary_for_old_gen_needs(desired_free_space); | |
| 931 } | |
| 932 | |
| 933 // Delegate the resize to the generation. | |
| 934 _old_gen->resize(desired_free_space); | |
| 935 } | |
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936 |
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937 ParallelScavengeHeap::ParStrongRootsScope::ParStrongRootsScope() { |
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938 // nothing particular |
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939 } |
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940 |
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941 ParallelScavengeHeap::ParStrongRootsScope::~ParStrongRootsScope() { |
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942 // nothing particular |
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943 } |
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944 |
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945 #ifndef PRODUCT |
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946 void ParallelScavengeHeap::record_gen_tops_before_GC() { |
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947 if (ZapUnusedHeapArea) { |
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948 young_gen()->record_spaces_top(); |
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949 old_gen()->record_spaces_top(); |
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950 perm_gen()->record_spaces_top(); |
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951 } |
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952 } |
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953 |
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954 void ParallelScavengeHeap::gen_mangle_unused_area() { |
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955 if (ZapUnusedHeapArea) { |
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956 young_gen()->eden_space()->mangle_unused_area(); |
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957 young_gen()->to_space()->mangle_unused_area(); |
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958 young_gen()->from_space()->mangle_unused_area(); |
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959 old_gen()->object_space()->mangle_unused_area(); |
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960 perm_gen()->object_space()->mangle_unused_area(); |
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961 } |
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962 } |
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963 #endif |