Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | d2a62e0f25eb |
| children | 82657b6a8cc0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/parallelScavenge/adjoiningGenerations.hpp" | |
| 27 #include "gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp" | |
| 28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp" | |
| 29 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" | |
| 30 #include "gc_implementation/parallelScavenge/generationSizer.hpp" | |
| 31 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp" | |
| 32 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
| 33 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" | |
| 34 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
| 35 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp" | |
| 36 #include "gc_implementation/parallelScavenge/psScavenge.hpp" | |
| 37 #include "gc_implementation/parallelScavenge/vmPSOperations.hpp" | |
| 38 #include "memory/gcLocker.inline.hpp" | |
| 39 #include "oops/oop.inline.hpp" | |
| 40 #include "runtime/handles.inline.hpp" | |
| 41 #include "runtime/java.hpp" | |
| 42 #include "runtime/vmThread.hpp" | |
| 6197 | 43 #include "services/memTracker.hpp" |
| 1972 | 44 #include "utilities/vmError.hpp" |
| 0 | 45 |
| 46 PSYoungGen* ParallelScavengeHeap::_young_gen = NULL; | |
| 47 PSOldGen* ParallelScavengeHeap::_old_gen = NULL; | |
| 48 PSAdaptiveSizePolicy* ParallelScavengeHeap::_size_policy = NULL; | |
| 49 PSGCAdaptivePolicyCounters* ParallelScavengeHeap::_gc_policy_counters = NULL; | |
| 50 ParallelScavengeHeap* ParallelScavengeHeap::_psh = NULL; | |
| 51 GCTaskManager* ParallelScavengeHeap::_gc_task_manager = NULL; | |
| 52 | |
| 53 static void trace_gen_sizes(const char* const str, | |
| 54 size_t og_min, size_t og_max, | |
| 55 size_t yg_min, size_t yg_max) | |
| 56 { | |
| 57 if (TracePageSizes) { | |
| 58 tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " " | |
| 59 SIZE_FORMAT "," SIZE_FORMAT " " | |
| 60 SIZE_FORMAT, | |
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61 str, |
| 0 | 62 og_min / K, og_max / K, |
| 63 yg_min / K, yg_max / K, | |
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64 (og_max + yg_max) / K); |
| 0 | 65 } |
| 66 } | |
| 67 | |
| 68 jint ParallelScavengeHeap::initialize() { | |
| 1166 | 69 CollectedHeap::pre_initialize(); |
| 70 | |
| 0 | 71 // Cannot be initialized until after the flags are parsed |
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72 // GenerationSizer flag_parser; |
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73 _collector_policy = new GenerationSizer(); |
| 0 | 74 |
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75 size_t yg_min_size = _collector_policy->min_young_gen_size(); |
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76 size_t yg_max_size = _collector_policy->max_young_gen_size(); |
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77 size_t og_min_size = _collector_policy->min_old_gen_size(); |
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78 size_t og_max_size = _collector_policy->max_old_gen_size(); |
| 0 | 79 |
| 80 trace_gen_sizes("ps heap raw", | |
| 81 og_min_size, og_max_size, | |
| 82 yg_min_size, yg_max_size); | |
| 83 | |
| 84 const size_t og_page_sz = os::page_size_for_region(yg_min_size + og_min_size, | |
| 85 yg_max_size + og_max_size, | |
| 86 8); | |
| 87 | |
| 88 const size_t og_align = set_alignment(_old_gen_alignment, og_page_sz); | |
| 89 const size_t yg_align = set_alignment(_young_gen_alignment, og_page_sz); | |
| 90 | |
| 91 // Update sizes to reflect the selected page size(s). | |
| 92 // | |
| 93 // NEEDS_CLEANUP. The default TwoGenerationCollectorPolicy uses NewRatio; it | |
| 94 // should check UseAdaptiveSizePolicy. Changes from generationSizer could | |
| 95 // move to the common code. | |
| 96 yg_min_size = align_size_up(yg_min_size, yg_align); | |
| 97 yg_max_size = align_size_up(yg_max_size, yg_align); | |
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98 size_t yg_cur_size = |
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99 align_size_up(_collector_policy->young_gen_size(), yg_align); |
| 0 | 100 yg_cur_size = MAX2(yg_cur_size, yg_min_size); |
| 101 | |
| 102 og_min_size = align_size_up(og_min_size, og_align); | |
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103 // Align old gen size down to preserve specified heap size. |
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104 assert(og_align == yg_align, "sanity"); |
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105 og_max_size = align_size_down(og_max_size, og_align); |
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106 og_max_size = MAX2(og_max_size, og_min_size); |
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107 size_t og_cur_size = |
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108 align_size_down(_collector_policy->old_gen_size(), og_align); |
| 0 | 109 og_cur_size = MAX2(og_cur_size, og_min_size); |
| 110 | |
| 111 trace_gen_sizes("ps heap rnd", | |
| 112 og_min_size, og_max_size, | |
| 113 yg_min_size, yg_max_size); | |
| 114 | |
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115 const size_t heap_size = og_max_size + yg_max_size; |
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116 |
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117 ReservedSpace heap_rs = Universe::reserve_heap(heap_size, og_align); |
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118 |
| 6197 | 119 MemTracker::record_virtual_memory_type((address)heap_rs.base(), mtJavaHeap); |
| 120 | |
| 0 | 121 os::trace_page_sizes("ps main", og_min_size + yg_min_size, |
| 122 og_max_size + yg_max_size, og_page_sz, | |
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123 heap_rs.base(), |
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124 heap_rs.size()); |
| 0 | 125 if (!heap_rs.is_reserved()) { |
| 126 vm_shutdown_during_initialization( | |
| 127 "Could not reserve enough space for object heap"); | |
| 128 return JNI_ENOMEM; | |
| 129 } | |
| 130 | |
| 131 _reserved = MemRegion((HeapWord*)heap_rs.base(), | |
| 132 (HeapWord*)(heap_rs.base() + heap_rs.size())); | |
| 133 | |
| 134 CardTableExtension* const barrier_set = new CardTableExtension(_reserved, 3); | |
| 135 _barrier_set = barrier_set; | |
| 136 oopDesc::set_bs(_barrier_set); | |
| 137 if (_barrier_set == NULL) { | |
| 138 vm_shutdown_during_initialization( | |
| 139 "Could not reserve enough space for barrier set"); | |
| 140 return JNI_ENOMEM; | |
| 141 } | |
| 142 | |
| 143 // Initial young gen size is 4 Mb | |
| 144 // | |
| 145 // XXX - what about flag_parser.young_gen_size()? | |
| 146 const size_t init_young_size = align_size_up(4 * M, yg_align); | |
| 147 yg_cur_size = MAX2(MIN2(init_young_size, yg_max_size), yg_cur_size); | |
| 148 | |
| 149 // Make up the generations | |
| 150 // Calculate the maximum size that a generation can grow. This | |
| 151 // includes growth into the other generation. Note that the | |
| 152 // parameter _max_gen_size is kept as the maximum | |
| 153 // size of the generation as the boundaries currently stand. | |
| 154 // _max_gen_size is still used as that value. | |
| 155 double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0; | |
| 156 double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0; | |
| 157 | |
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158 _gens = new AdjoiningGenerations(heap_rs, |
| 0 | 159 og_cur_size, |
| 160 og_min_size, | |
| 161 og_max_size, | |
| 162 yg_cur_size, | |
| 163 yg_min_size, | |
| 164 yg_max_size, | |
| 165 yg_align); | |
| 166 | |
| 167 _old_gen = _gens->old_gen(); | |
| 168 _young_gen = _gens->young_gen(); | |
| 169 | |
| 170 const size_t eden_capacity = _young_gen->eden_space()->capacity_in_bytes(); | |
| 171 const size_t old_capacity = _old_gen->capacity_in_bytes(); | |
| 172 const size_t initial_promo_size = MIN2(eden_capacity, old_capacity); | |
| 173 _size_policy = | |
| 174 new PSAdaptiveSizePolicy(eden_capacity, | |
| 175 initial_promo_size, | |
| 176 young_gen()->to_space()->capacity_in_bytes(), | |
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177 intra_heap_alignment(), |
| 0 | 178 max_gc_pause_sec, |
| 179 max_gc_minor_pause_sec, | |
| 180 GCTimeRatio | |
| 181 ); | |
| 182 | |
| 183 assert(!UseAdaptiveGCBoundary || | |
| 184 (old_gen()->virtual_space()->high_boundary() == | |
| 185 young_gen()->virtual_space()->low_boundary()), | |
| 186 "Boundaries must meet"); | |
| 187 // initialize the policy counters - 2 collectors, 3 generations | |
| 188 _gc_policy_counters = | |
| 189 new PSGCAdaptivePolicyCounters("ParScav:MSC", 2, 3, _size_policy); | |
| 190 _psh = this; | |
| 191 | |
| 192 // Set up the GCTaskManager | |
| 193 _gc_task_manager = GCTaskManager::create(ParallelGCThreads); | |
| 194 | |
| 195 if (UseParallelOldGC && !PSParallelCompact::initialize()) { | |
| 196 return JNI_ENOMEM; | |
| 197 } | |
| 198 | |
| 199 return JNI_OK; | |
| 200 } | |
| 201 | |
| 202 void ParallelScavengeHeap::post_initialize() { | |
| 203 // Need to init the tenuring threshold | |
| 204 PSScavenge::initialize(); | |
| 205 if (UseParallelOldGC) { | |
| 206 PSParallelCompact::post_initialize(); | |
| 207 } else { | |
| 208 PSMarkSweep::initialize(); | |
| 209 } | |
| 210 PSPromotionManager::initialize(); | |
| 211 } | |
| 212 | |
| 213 void ParallelScavengeHeap::update_counters() { | |
| 214 young_gen()->update_counters(); | |
| 215 old_gen()->update_counters(); | |
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216 MetaspaceCounters::update_performance_counters(); |
| 0 | 217 } |
| 218 | |
| 219 size_t ParallelScavengeHeap::capacity() const { | |
| 220 size_t value = young_gen()->capacity_in_bytes() + old_gen()->capacity_in_bytes(); | |
| 221 return value; | |
| 222 } | |
| 223 | |
| 224 size_t ParallelScavengeHeap::used() const { | |
| 225 size_t value = young_gen()->used_in_bytes() + old_gen()->used_in_bytes(); | |
| 226 return value; | |
| 227 } | |
| 228 | |
| 229 bool ParallelScavengeHeap::is_maximal_no_gc() const { | |
| 230 return old_gen()->is_maximal_no_gc() && young_gen()->is_maximal_no_gc(); | |
| 231 } | |
| 232 | |
| 233 | |
| 234 size_t ParallelScavengeHeap::max_capacity() const { | |
| 235 size_t estimated = reserved_region().byte_size(); | |
| 236 if (UseAdaptiveSizePolicy) { | |
| 237 estimated -= _size_policy->max_survivor_size(young_gen()->max_size()); | |
| 238 } else { | |
| 239 estimated -= young_gen()->to_space()->capacity_in_bytes(); | |
| 240 } | |
| 241 return MAX2(estimated, capacity()); | |
| 242 } | |
| 243 | |
| 244 bool ParallelScavengeHeap::is_in(const void* p) const { | |
| 245 if (young_gen()->is_in(p)) { | |
| 246 return true; | |
| 247 } | |
| 248 | |
| 249 if (old_gen()->is_in(p)) { | |
| 250 return true; | |
| 251 } | |
| 252 | |
| 253 return false; | |
| 254 } | |
| 255 | |
| 256 bool ParallelScavengeHeap::is_in_reserved(const void* p) const { | |
| 257 if (young_gen()->is_in_reserved(p)) { | |
| 258 return true; | |
| 259 } | |
| 260 | |
| 261 if (old_gen()->is_in_reserved(p)) { | |
| 262 return true; | |
| 263 } | |
| 264 | |
| 265 return false; | |
| 266 } | |
| 267 | |
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268 bool ParallelScavengeHeap::is_scavengable(const void* addr) { |
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269 return is_in_young((oop)addr); |
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270 } |
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271 |
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272 #ifdef ASSERT |
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273 // Don't implement this by using is_in_young(). This method is used |
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274 // in some cases to check that is_in_young() is correct. |
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275 bool ParallelScavengeHeap::is_in_partial_collection(const void *p) { |
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276 assert(is_in_reserved(p) || p == NULL, |
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277 "Does not work if address is non-null and outside of the heap"); |
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278 // The order of the generations is old (low addr), young (high addr) |
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279 return p >= old_gen()->reserved().end(); |
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280 } |
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281 #endif |
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282 |
| 0 | 283 // There are two levels of allocation policy here. |
| 284 // | |
| 285 // When an allocation request fails, the requesting thread must invoke a VM | |
| 286 // operation, transfer control to the VM thread, and await the results of a | |
| 287 // garbage collection. That is quite expensive, and we should avoid doing it | |
| 288 // multiple times if possible. | |
| 289 // | |
| 290 // To accomplish this, we have a basic allocation policy, and also a | |
| 291 // failed allocation policy. | |
| 292 // | |
| 293 // The basic allocation policy controls how you allocate memory without | |
| 294 // attempting garbage collection. It is okay to grab locks and | |
| 295 // expand the heap, if that can be done without coming to a safepoint. | |
| 296 // It is likely that the basic allocation policy will not be very | |
| 297 // aggressive. | |
| 298 // | |
| 299 // The failed allocation policy is invoked from the VM thread after | |
| 300 // the basic allocation policy is unable to satisfy a mem_allocate | |
| 301 // request. This policy needs to cover the entire range of collection, | |
| 302 // heap expansion, and out-of-memory conditions. It should make every | |
| 303 // attempt to allocate the requested memory. | |
| 304 | |
| 305 // Basic allocation policy. Should never be called at a safepoint, or | |
| 306 // from the VM thread. | |
| 307 // | |
| 308 // This method must handle cases where many mem_allocate requests fail | |
| 309 // simultaneously. When that happens, only one VM operation will succeed, | |
| 310 // and the rest will not be executed. For that reason, this method loops | |
| 311 // during failed allocation attempts. If the java heap becomes exhausted, | |
| 312 // we rely on the size_policy object to force a bail out. | |
| 313 HeapWord* ParallelScavengeHeap::mem_allocate( | |
| 314 size_t size, | |
| 315 bool* gc_overhead_limit_was_exceeded) { | |
| 316 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); | |
| 317 assert(Thread::current() != (Thread*)VMThread::vm_thread(), "should not be in vm thread"); | |
| 318 assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); | |
| 319 | |
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320 // In general gc_overhead_limit_was_exceeded should be false so |
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321 // set it so here and reset it to true only if the gc time |
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322 // limit is being exceeded as checked below. |
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323 *gc_overhead_limit_was_exceeded = false; |
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324 |
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325 HeapWord* result = young_gen()->allocate(size); |
| 0 | 326 |
| 327 uint loop_count = 0; | |
| 328 uint gc_count = 0; | |
| 329 | |
| 330 while (result == NULL) { | |
| 331 // We don't want to have multiple collections for a single filled generation. | |
| 332 // To prevent this, each thread tracks the total_collections() value, and if | |
| 333 // the count has changed, does not do a new collection. | |
| 334 // | |
| 335 // The collection count must be read only while holding the heap lock. VM | |
| 336 // operations also hold the heap lock during collections. There is a lock | |
| 337 // contention case where thread A blocks waiting on the Heap_lock, while | |
| 338 // thread B is holding it doing a collection. When thread A gets the lock, | |
| 339 // the collection count has already changed. To prevent duplicate collections, | |
| 340 // The policy MUST attempt allocations during the same period it reads the | |
| 341 // total_collections() value! | |
| 342 { | |
| 343 MutexLocker ml(Heap_lock); | |
| 344 gc_count = Universe::heap()->total_collections(); | |
| 345 | |
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346 result = young_gen()->allocate(size); |
| 0 | 347 if (result != NULL) { |
| 348 return result; | |
| 349 } | |
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350 |
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351 // If certain conditions hold, try allocating from the old gen. |
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352 result = mem_allocate_old_gen(size); |
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353 if (result != NULL) { |
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354 return result; |
| 0 | 355 } |
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356 |
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357 // Failed to allocate without a gc. |
| 0 | 358 if (GC_locker::is_active_and_needs_gc()) { |
| 359 // If this thread is not in a jni critical section, we stall | |
| 360 // the requestor until the critical section has cleared and | |
| 361 // GC allowed. When the critical section clears, a GC is | |
| 362 // initiated by the last thread exiting the critical section; so | |
| 363 // we retry the allocation sequence from the beginning of the loop, | |
| 364 // rather than causing more, now probably unnecessary, GC attempts. | |
| 365 JavaThread* jthr = JavaThread::current(); | |
| 366 if (!jthr->in_critical()) { | |
| 367 MutexUnlocker mul(Heap_lock); | |
| 368 GC_locker::stall_until_clear(); | |
| 369 continue; | |
| 370 } else { | |
| 371 if (CheckJNICalls) { | |
| 372 fatal("Possible deadlock due to allocating while" | |
| 373 " in jni critical section"); | |
| 374 } | |
| 375 return NULL; | |
| 376 } | |
| 377 } | |
| 378 } | |
| 379 | |
| 380 if (result == NULL) { | |
| 381 // Generate a VM operation | |
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382 VM_ParallelGCFailedAllocation op(size, gc_count); |
| 0 | 383 VMThread::execute(&op); |
| 384 | |
| 385 // Did the VM operation execute? If so, return the result directly. | |
| 386 // This prevents us from looping until time out on requests that can | |
| 387 // not be satisfied. | |
| 388 if (op.prologue_succeeded()) { | |
| 389 assert(Universe::heap()->is_in_or_null(op.result()), | |
| 390 "result not in heap"); | |
| 391 | |
| 392 // If GC was locked out during VM operation then retry allocation | |
| 393 // and/or stall as necessary. | |
| 394 if (op.gc_locked()) { | |
| 395 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); | |
| 396 continue; // retry and/or stall as necessary | |
| 397 } | |
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398 |
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399 // Exit the loop if the gc time limit has been exceeded. |
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400 // The allocation must have failed above ("result" guarding |
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401 // this path is NULL) and the most recent collection has exceeded the |
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402 // gc overhead limit (although enough may have been collected to |
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403 // satisfy the allocation). Exit the loop so that an out-of-memory |
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404 // will be thrown (return a NULL ignoring the contents of |
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405 // op.result()), |
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406 // but clear gc_overhead_limit_exceeded so that the next collection |
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407 // starts with a clean slate (i.e., forgets about previous overhead |
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408 // excesses). Fill op.result() with a filler object so that the |
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409 // heap remains parsable. |
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410 const bool limit_exceeded = size_policy()->gc_overhead_limit_exceeded(); |
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411 const bool softrefs_clear = collector_policy()->all_soft_refs_clear(); |
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412 assert(!limit_exceeded || softrefs_clear, "Should have been cleared"); |
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413 if (limit_exceeded && softrefs_clear) { |
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414 *gc_overhead_limit_was_exceeded = true; |
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415 size_policy()->set_gc_overhead_limit_exceeded(false); |
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416 if (PrintGCDetails && Verbose) { |
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417 gclog_or_tty->print_cr("ParallelScavengeHeap::mem_allocate: " |
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418 "return NULL because gc_overhead_limit_exceeded is set"); |
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419 } |
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420 if (op.result() != NULL) { |
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421 CollectedHeap::fill_with_object(op.result(), size); |
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422 } |
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423 return NULL; |
| 0 | 424 } |
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425 |
| 0 | 426 return op.result(); |
| 427 } | |
| 428 } | |
| 429 | |
| 430 // The policy object will prevent us from looping forever. If the | |
| 431 // time spent in gc crosses a threshold, we will bail out. | |
| 432 loop_count++; | |
| 433 if ((result == NULL) && (QueuedAllocationWarningCount > 0) && | |
| 434 (loop_count % QueuedAllocationWarningCount == 0)) { | |
| 435 warning("ParallelScavengeHeap::mem_allocate retries %d times \n\t" | |
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436 " size=%d", loop_count, size); |
| 0 | 437 } |
| 438 } | |
| 439 | |
| 440 return result; | |
| 441 } | |
| 442 | |
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443 // A "death march" is a series of ultra-slow allocations in which a full gc is |
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444 // done before each allocation, and after the full gc the allocation still |
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445 // cannot be satisfied from the young gen. This routine detects that condition; |
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446 // it should be called after a full gc has been done and the allocation |
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447 // attempted from the young gen. The parameter 'addr' should be the result of |
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448 // that young gen allocation attempt. |
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449 void |
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450 ParallelScavengeHeap::death_march_check(HeapWord* const addr, size_t size) { |
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451 if (addr != NULL) { |
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452 _death_march_count = 0; // death march has ended |
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453 } else if (_death_march_count == 0) { |
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454 if (should_alloc_in_eden(size)) { |
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455 _death_march_count = 1; // death march has started |
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456 } |
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457 } |
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458 } |
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459 |
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460 HeapWord* ParallelScavengeHeap::mem_allocate_old_gen(size_t size) { |
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461 if (!should_alloc_in_eden(size) || GC_locker::is_active_and_needs_gc()) { |
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462 // Size is too big for eden, or gc is locked out. |
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463 return old_gen()->allocate(size); |
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464 } |
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465 |
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466 // If a "death march" is in progress, allocate from the old gen a limited |
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467 // number of times before doing a GC. |
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468 if (_death_march_count > 0) { |
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469 if (_death_march_count < 64) { |
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470 ++_death_march_count; |
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471 return old_gen()->allocate(size); |
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472 } else { |
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473 _death_march_count = 0; |
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474 } |
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475 } |
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476 return NULL; |
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477 } |
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478 |
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479 void ParallelScavengeHeap::do_full_collection(bool clear_all_soft_refs) { |
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480 if (UseParallelOldGC) { |
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481 // The do_full_collection() parameter clear_all_soft_refs |
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482 // is interpreted here as maximum_compaction which will |
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483 // cause SoftRefs to be cleared. |
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484 bool maximum_compaction = clear_all_soft_refs; |
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485 PSParallelCompact::invoke(maximum_compaction); |
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486 } else { |
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487 PSMarkSweep::invoke(clear_all_soft_refs); |
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488 } |
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489 } |
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490 |
| 0 | 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. | |
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497 HeapWord* ParallelScavengeHeap::failed_mem_allocate(size_t size) { |
| 0 | 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 | |
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503 // We assume that allocation in eden will fail unless we collect. |
| 0 | 504 |
| 505 // First level allocation failure, scavenge and allocate in young gen. | |
| 506 GCCauseSetter gccs(this, GCCause::_allocation_failure); | |
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507 const bool invoked_full_gc = PSScavenge::invoke(); |
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508 HeapWord* result = young_gen()->allocate(size); |
| 0 | 509 |
| 510 // Second level allocation failure. | |
| 511 // Mark sweep and allocate in young generation. | |
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512 if (result == NULL && !invoked_full_gc) { |
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513 do_full_collection(false); |
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514 result = young_gen()->allocate(size); |
| 0 | 515 } |
| 516 | |
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517 death_march_check(result, size); |
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518 |
| 0 | 519 // Third level allocation failure. |
| 520 // After mark sweep and young generation allocation failure, | |
| 521 // allocate in old generation. | |
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522 if (result == NULL) { |
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523 result = old_gen()->allocate(size); |
| 0 | 524 } |
| 525 | |
| 526 // Fourth level allocation failure. We're running out of memory. | |
| 527 // More complete mark sweep and allocate in young generation. | |
| 528 if (result == NULL) { | |
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529 do_full_collection(true); |
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530 result = young_gen()->allocate(size); |
| 0 | 531 } |
| 532 | |
| 533 // Fifth level allocation failure. | |
| 534 // After more complete mark sweep, allocate in old generation. | |
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535 if (result == NULL) { |
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536 result = old_gen()->allocate(size); |
| 0 | 537 } |
| 538 | |
| 539 return result; | |
| 540 } | |
| 541 | |
| 542 void ParallelScavengeHeap::ensure_parsability(bool retire_tlabs) { | |
| 543 CollectedHeap::ensure_parsability(retire_tlabs); | |
| 544 young_gen()->eden_space()->ensure_parsability(); | |
| 545 } | |
| 546 | |
| 547 size_t ParallelScavengeHeap::unsafe_max_alloc() { | |
| 548 return young_gen()->eden_space()->free_in_bytes(); | |
| 549 } | |
| 550 | |
| 551 size_t ParallelScavengeHeap::tlab_capacity(Thread* thr) const { | |
| 552 return young_gen()->eden_space()->tlab_capacity(thr); | |
| 553 } | |
| 554 | |
| 555 size_t ParallelScavengeHeap::unsafe_max_tlab_alloc(Thread* thr) const { | |
| 556 return young_gen()->eden_space()->unsafe_max_tlab_alloc(thr); | |
| 557 } | |
| 558 | |
| 559 HeapWord* ParallelScavengeHeap::allocate_new_tlab(size_t size) { | |
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560 return young_gen()->allocate(size); |
| 0 | 561 } |
| 562 | |
| 563 void ParallelScavengeHeap::accumulate_statistics_all_tlabs() { | |
| 564 CollectedHeap::accumulate_statistics_all_tlabs(); | |
| 565 } | |
| 566 | |
| 567 void ParallelScavengeHeap::resize_all_tlabs() { | |
| 568 CollectedHeap::resize_all_tlabs(); | |
| 569 } | |
| 570 | |
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571 bool ParallelScavengeHeap::can_elide_initializing_store_barrier(oop new_obj) { |
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572 // We don't need barriers for stores to objects in the |
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573 // young gen and, a fortiori, for initializing stores to |
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574 // objects therein. |
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575 return is_in_young(new_obj); |
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576 } |
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577 |
| 0 | 578 // This method is used by System.gc() and JVMTI. |
| 579 void ParallelScavengeHeap::collect(GCCause::Cause cause) { | |
| 580 assert(!Heap_lock->owned_by_self(), | |
| 581 "this thread should not own the Heap_lock"); | |
| 582 | |
| 583 unsigned int gc_count = 0; | |
| 584 unsigned int full_gc_count = 0; | |
| 585 { | |
| 586 MutexLocker ml(Heap_lock); | |
| 587 // This value is guarded by the Heap_lock | |
| 588 gc_count = Universe::heap()->total_collections(); | |
| 589 full_gc_count = Universe::heap()->total_full_collections(); | |
| 590 } | |
| 591 | |
| 592 VM_ParallelGCSystemGC op(gc_count, full_gc_count, cause); | |
| 593 VMThread::execute(&op); | |
| 594 } | |
| 595 | |
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596 void ParallelScavengeHeap::oop_iterate(ExtendedOopClosure* cl) { |
| 0 | 597 Unimplemented(); |
| 598 } | |
| 599 | |
| 600 void ParallelScavengeHeap::object_iterate(ObjectClosure* cl) { | |
| 601 young_gen()->object_iterate(cl); | |
| 602 old_gen()->object_iterate(cl); | |
| 603 } | |
| 604 | |
| 605 | |
| 606 HeapWord* ParallelScavengeHeap::block_start(const void* addr) const { | |
| 607 if (young_gen()->is_in_reserved(addr)) { | |
| 608 assert(young_gen()->is_in(addr), | |
| 609 "addr should be in allocated part of young gen"); | |
| 1907 | 610 // called from os::print_location by find or VMError |
| 611 if (Debugging || VMError::fatal_error_in_progress()) return NULL; | |
| 0 | 612 Unimplemented(); |
| 613 } else if (old_gen()->is_in_reserved(addr)) { | |
| 614 assert(old_gen()->is_in(addr), | |
| 615 "addr should be in allocated part of old gen"); | |
| 616 return old_gen()->start_array()->object_start((HeapWord*)addr); | |
| 617 } | |
| 618 return 0; | |
| 619 } | |
| 620 | |
| 621 size_t ParallelScavengeHeap::block_size(const HeapWord* addr) const { | |
| 622 return oop(addr)->size(); | |
| 623 } | |
| 624 | |
| 625 bool ParallelScavengeHeap::block_is_obj(const HeapWord* addr) const { | |
| 626 return block_start(addr) == addr; | |
| 627 } | |
| 628 | |
| 629 jlong ParallelScavengeHeap::millis_since_last_gc() { | |
| 630 return UseParallelOldGC ? | |
| 631 PSParallelCompact::millis_since_last_gc() : | |
| 632 PSMarkSweep::millis_since_last_gc(); | |
| 633 } | |
| 634 | |
| 635 void ParallelScavengeHeap::prepare_for_verify() { | |
| 636 ensure_parsability(false); // no need to retire TLABs for verification | |
| 637 } | |
| 638 | |
| 639 void ParallelScavengeHeap::print_on(outputStream* st) const { | |
| 640 young_gen()->print_on(st); | |
| 641 old_gen()->print_on(st); | |
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642 MetaspaceAux::print_on(st); |
| 0 | 643 } |
| 644 | |
| 645 void ParallelScavengeHeap::gc_threads_do(ThreadClosure* tc) const { | |
| 646 PSScavenge::gc_task_manager()->threads_do(tc); | |
| 647 } | |
| 648 | |
| 649 void ParallelScavengeHeap::print_gc_threads_on(outputStream* st) const { | |
| 650 PSScavenge::gc_task_manager()->print_threads_on(st); | |
| 651 } | |
| 652 | |
| 653 void ParallelScavengeHeap::print_tracing_info() const { | |
| 654 if (TraceGen0Time) { | |
| 655 double time = PSScavenge::accumulated_time()->seconds(); | |
| 656 tty->print_cr("[Accumulated GC generation 0 time %3.7f secs]", time); | |
| 657 } | |
| 658 if (TraceGen1Time) { | |
| 659 double time = PSMarkSweep::accumulated_time()->seconds(); | |
| 660 tty->print_cr("[Accumulated GC generation 1 time %3.7f secs]", time); | |
| 661 } | |
| 662 } | |
| 663 | |
| 664 | |
| 6008 | 665 void ParallelScavengeHeap::verify(bool silent, VerifyOption option /* ignored */) { |
| 0 | 666 // Why do we need the total_collections()-filter below? |
| 667 if (total_collections() > 0) { | |
| 668 if (!silent) { | |
| 669 gclog_or_tty->print("tenured "); | |
| 670 } | |
| 6008 | 671 old_gen()->verify(); |
| 0 | 672 |
| 673 if (!silent) { | |
| 674 gclog_or_tty->print("eden "); | |
| 675 } | |
| 6008 | 676 young_gen()->verify(); |
| 0 | 677 } |
| 678 } | |
| 679 | |
| 680 void ParallelScavengeHeap::print_heap_change(size_t prev_used) { | |
| 681 if (PrintGCDetails && Verbose) { | |
| 682 gclog_or_tty->print(" " SIZE_FORMAT | |
| 683 "->" SIZE_FORMAT | |
| 684 "(" SIZE_FORMAT ")", | |
| 685 prev_used, used(), capacity()); | |
| 686 } else { | |
| 687 gclog_or_tty->print(" " SIZE_FORMAT "K" | |
| 688 "->" SIZE_FORMAT "K" | |
| 689 "(" SIZE_FORMAT "K)", | |
| 690 prev_used / K, used() / K, capacity() / K); | |
| 691 } | |
| 692 } | |
| 693 | |
| 694 ParallelScavengeHeap* ParallelScavengeHeap::heap() { | |
| 695 assert(_psh != NULL, "Uninitialized access to ParallelScavengeHeap::heap()"); | |
| 696 assert(_psh->kind() == CollectedHeap::ParallelScavengeHeap, "not a parallel scavenge heap"); | |
| 697 return _psh; | |
| 698 } | |
| 699 | |
| 700 // Before delegating the resize to the young generation, | |
| 701 // the reserved space for the young and old generations | |
| 702 // may be changed to accomodate the desired resize. | |
| 703 void ParallelScavengeHeap::resize_young_gen(size_t eden_size, | |
| 704 size_t survivor_size) { | |
| 705 if (UseAdaptiveGCBoundary) { | |
| 706 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
| 707 size_policy()->reset_bytes_absorbed_from_eden(); | |
| 708 return; // The generation changed size already. | |
| 709 } | |
| 710 gens()->adjust_boundary_for_young_gen_needs(eden_size, survivor_size); | |
| 711 } | |
| 712 | |
| 713 // Delegate the resize to the generation. | |
| 714 _young_gen->resize(eden_size, survivor_size); | |
| 715 } | |
| 716 | |
| 717 // Before delegating the resize to the old generation, | |
| 718 // the reserved space for the young and old generations | |
| 719 // may be changed to accomodate the desired resize. | |
| 720 void ParallelScavengeHeap::resize_old_gen(size_t desired_free_space) { | |
| 721 if (UseAdaptiveGCBoundary) { | |
| 722 if (size_policy()->bytes_absorbed_from_eden() != 0) { | |
| 723 size_policy()->reset_bytes_absorbed_from_eden(); | |
| 724 return; // The generation changed size already. | |
| 725 } | |
| 726 gens()->adjust_boundary_for_old_gen_needs(desired_free_space); | |
| 727 } | |
| 728 | |
| 729 // Delegate the resize to the generation. | |
| 730 _old_gen->resize(desired_free_space); | |
| 731 } | |
|
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732 |
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733 ParallelScavengeHeap::ParStrongRootsScope::ParStrongRootsScope() { |
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734 // nothing particular |
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735 } |
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736 |
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737 ParallelScavengeHeap::ParStrongRootsScope::~ParStrongRootsScope() { |
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738 // nothing particular |
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739 } |
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740 |
|
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741 #ifndef PRODUCT |
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742 void ParallelScavengeHeap::record_gen_tops_before_GC() { |
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743 if (ZapUnusedHeapArea) { |
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744 young_gen()->record_spaces_top(); |
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745 old_gen()->record_spaces_top(); |
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746 } |
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747 } |
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748 |
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749 void ParallelScavengeHeap::gen_mangle_unused_area() { |
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750 if (ZapUnusedHeapArea) { |
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751 young_gen()->eden_space()->mangle_unused_area(); |
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752 young_gen()->to_space()->mangle_unused_area(); |
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753 young_gen()->from_space()->mangle_unused_area(); |
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754 old_gen()->object_space()->mangle_unused_area(); |
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755 } |
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756 } |
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757 #endif |