1 /* 2 * Copyright (c) 2015, 2019, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 #include "precompiled.hpp" 25 #include "gc/shared/gcHeapSummary.hpp" 26 #include "gc/shared/suspendibleThreadSet.hpp" 27 #include "gc/z/zCollectedHeap.hpp" 28 #include "gc/z/zGlobals.hpp" 29 #include "gc/z/zHeap.inline.hpp" 30 #include "gc/z/zNMethod.hpp" 31 #include "gc/z/zServiceability.hpp" 32 #include "gc/z/zStat.hpp" 33 #include "gc/z/zUtils.inline.hpp" 34 #include "runtime/mutexLocker.hpp" 35 36 ZCollectedHeap* ZCollectedHeap::heap() { 37 CollectedHeap* heap = Universe::heap(); 38 assert(heap != NULL, "Uninitialized access to ZCollectedHeap::heap()"); 39 assert(heap->kind() == CollectedHeap::Z, "Invalid name"); 40 return (ZCollectedHeap*)heap; 41 } 42 43 ZCollectedHeap::ZCollectedHeap(ZCollectorPolicy* policy) : 44 _collector_policy(policy), 45 _soft_ref_policy(), 46 _barrier_set(), 47 _initialize(&_barrier_set), 48 _heap(), 49 _director(new ZDirector()), 50 _driver(new ZDriver()), 51 _stat(new ZStat()), 52 _runtime_workers() {} 53 54 CollectedHeap::Name ZCollectedHeap::kind() const { 55 return CollectedHeap::Z; 56 } 57 58 const char* ZCollectedHeap::name() const { 59 return ZGCName; 60 } 61 62 jint ZCollectedHeap::initialize() { 63 if (!_heap.is_initialized()) { 64 return JNI_ENOMEM; 65 } 66 67 initialize_reserved_region((HeapWord*)ZAddressReservedStart(), 68 (HeapWord*)ZAddressReservedEnd()); 69 70 return JNI_OK; 71 } 72 73 void ZCollectedHeap::initialize_serviceability() { 74 _heap.serviceability_initialize(); 75 } 76 77 void ZCollectedHeap::stop() { 78 _director->stop(); 79 _driver->stop(); 80 _stat->stop(); 81 } 82 83 CollectorPolicy* ZCollectedHeap::collector_policy() const { 84 return _collector_policy; 85 } 86 87 SoftRefPolicy* ZCollectedHeap::soft_ref_policy() { 88 return &_soft_ref_policy; 89 } 90 91 size_t ZCollectedHeap::max_capacity() const { 92 return _heap.max_capacity(); 93 } 94 95 size_t ZCollectedHeap::capacity() const { 96 return _heap.capacity(); 97 } 98 99 size_t ZCollectedHeap::used() const { 100 return _heap.used(); 101 } 102 103 bool ZCollectedHeap::is_maximal_no_gc() const { 104 // Not supported 105 ShouldNotReachHere(); 106 return false; 107 } 108 109 bool ZCollectedHeap::is_in(const void* p) const { 110 return is_in_reserved(p) && _heap.is_in((uintptr_t)p); 111 } 112 113 bool ZCollectedHeap::is_in_closed_subset(const void* p) const { 114 return is_in(p); 115 } 116 117 HeapWord* ZCollectedHeap::allocate_new_tlab(size_t min_size, size_t requested_size, size_t* actual_size) { 118 const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(requested_size)); 119 const uintptr_t addr = _heap.alloc_tlab(size_in_bytes); 120 121 if (addr != 0) { 122 *actual_size = requested_size; 123 } 124 125 return (HeapWord*)addr; 126 } 127 128 HeapWord* ZCollectedHeap::mem_allocate(size_t size, bool* gc_overhead_limit_was_exceeded) { 129 const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(size)); 130 return (HeapWord*)_heap.alloc_object(size_in_bytes); 131 } 132 133 MetaWord* ZCollectedHeap::satisfy_failed_metadata_allocation(ClassLoaderData* loader_data, 134 size_t size, 135 Metaspace::MetadataType mdtype) { 136 MetaWord* result; 137 138 // Start asynchronous GC 139 collect(GCCause::_metadata_GC_threshold); 140 141 // Expand and retry allocation 142 result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype); 143 if (result != NULL) { 144 return result; 145 } 146 147 // Start synchronous GC 148 collect(GCCause::_metadata_GC_clear_soft_refs); 149 150 // Retry allocation 151 result = loader_data->metaspace_non_null()->allocate(size, mdtype); 152 if (result != NULL) { 153 return result; 154 } 155 156 // Expand and retry allocation 157 result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype); 158 if (result != NULL) { 159 return result; 160 } 161 162 // Out of memory 163 return NULL; 164 } 165 166 void ZCollectedHeap::collect(GCCause::Cause cause) { 167 _driver->collect(cause); 168 } 169 170 void ZCollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { 171 // These collection requests are ignored since ZGC can't run a synchronous 172 // GC cycle from within the VM thread. This is considered benign, since the 173 // only GC causes coming in here should be heap dumper and heap inspector. 174 // However, neither the heap dumper nor the heap inspector really need a GC 175 // to happen, but the result of their heap iterations might in that case be 176 // less accurate since they might include objects that would otherwise have 177 // been collected by a GC. 178 assert(Thread::current()->is_VM_thread(), "Should be the VM thread"); 179 guarantee(cause == GCCause::_heap_dump || 180 cause == GCCause::_heap_inspection, "Invalid cause"); 181 } 182 183 void ZCollectedHeap::do_full_collection(bool clear_all_soft_refs) { 184 // Not supported 185 ShouldNotReachHere(); 186 } 187 188 bool ZCollectedHeap::supports_tlab_allocation() const { 189 return true; 190 } 191 192 size_t ZCollectedHeap::tlab_capacity(Thread* ignored) const { 193 return _heap.tlab_capacity(); 194 } 195 196 size_t ZCollectedHeap::tlab_used(Thread* ignored) const { 197 return _heap.tlab_used(); 198 } 199 200 size_t ZCollectedHeap::max_tlab_size() const { 201 return _heap.max_tlab_size(); 202 } 203 204 size_t ZCollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { 205 return _heap.unsafe_max_tlab_alloc(); 206 } 207 208 bool ZCollectedHeap::can_elide_tlab_store_barriers() const { 209 return false; 210 } 211 212 bool ZCollectedHeap::can_elide_initializing_store_barrier(oop new_obj) { 213 // Not supported 214 ShouldNotReachHere(); 215 return true; 216 } 217 218 bool ZCollectedHeap::card_mark_must_follow_store() const { 219 // Not supported 220 ShouldNotReachHere(); 221 return false; 222 } 223 224 GrowableArray<GCMemoryManager*> ZCollectedHeap::memory_managers() { 225 return GrowableArray<GCMemoryManager*>(1, 1, _heap.serviceability_memory_manager()); 226 } 227 228 GrowableArray<MemoryPool*> ZCollectedHeap::memory_pools() { 229 return GrowableArray<MemoryPool*>(1, 1, _heap.serviceability_memory_pool()); 230 } 231 232 void ZCollectedHeap::object_iterate(ObjectClosure* cl) { 233 _heap.object_iterate(cl, true /* visit_referents */); 234 } 235 236 void ZCollectedHeap::safe_object_iterate(ObjectClosure* cl) { 237 _heap.object_iterate(cl, true /* visit_referents */); 238 } 239 240 HeapWord* ZCollectedHeap::block_start(const void* addr) const { 241 return (HeapWord*)_heap.block_start((uintptr_t)addr); 242 } 243 244 size_t ZCollectedHeap::block_size(const HeapWord* addr) const { 245 size_t size_in_bytes = _heap.block_size((uintptr_t)addr); 246 return ZUtils::bytes_to_words(size_in_bytes); 247 } 248 249 bool ZCollectedHeap::block_is_obj(const HeapWord* addr) const { 250 return _heap.block_is_obj((uintptr_t)addr); 251 } 252 253 void ZCollectedHeap::register_nmethod(nmethod* nm) { 254 ZNMethod::register_nmethod(nm); 255 } 256 257 void ZCollectedHeap::unregister_nmethod(nmethod* nm) { 258 ZNMethod::unregister_nmethod(nm); 259 } 260 261 void ZCollectedHeap::flush_nmethod(nmethod* nm) { 262 ZNMethod::flush_nmethod(nm); 263 } 264 265 void ZCollectedHeap::verify_nmethod(nmethod* nm) { 266 // Does nothing 267 } 268 269 WorkGang* ZCollectedHeap::get_safepoint_workers() { 270 return _runtime_workers.workers(); 271 } 272 273 jlong ZCollectedHeap::millis_since_last_gc() { 274 return ZStatCycle::time_since_last() / MILLIUNITS; 275 } 276 277 void ZCollectedHeap::gc_threads_do(ThreadClosure* tc) const { 278 tc->do_thread(_director); 279 tc->do_thread(_driver); 280 tc->do_thread(_stat); 281 _heap.worker_threads_do(tc); 282 _runtime_workers.threads_do(tc); 283 } 284 285 VirtualSpaceSummary ZCollectedHeap::create_heap_space_summary() { 286 const size_t capacity_in_words = capacity() / HeapWordSize; 287 const size_t max_capacity_in_words = max_capacity() / HeapWordSize; 288 return VirtualSpaceSummary(reserved_region().start(), 289 reserved_region().start() + capacity_in_words, 290 reserved_region().start() + max_capacity_in_words); 291 } 292 293 void ZCollectedHeap::safepoint_synchronize_begin() { 294 SuspendibleThreadSet::synchronize(); 295 } 296 297 void ZCollectedHeap::safepoint_synchronize_end() { 298 SuspendibleThreadSet::desynchronize(); 299 } 300 301 void ZCollectedHeap::prepare_for_verify() { 302 // Does nothing 303 } 304 305 void ZCollectedHeap::print_on(outputStream* st) const { 306 _heap.print_on(st); 307 } 308 309 void ZCollectedHeap::print_on_error(outputStream* st) const { 310 CollectedHeap::print_on_error(st); 311 312 st->print_cr("Address Space"); 313 st->print_cr( " Start: " PTR_FORMAT, ZAddressSpaceStart); 314 st->print_cr( " End: " PTR_FORMAT, ZAddressSpaceEnd); 315 st->print_cr( " Size: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZAddressSpaceSize, ZAddressSpaceSize); 316 st->print_cr( "Heap"); 317 st->print_cr( " GlobalPhase: %u", ZGlobalPhase); 318 st->print_cr( " GlobalSeqNum: %u", ZGlobalSeqNum); 319 st->print_cr( " Offset Max: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZAddressOffsetMax, ZAddressOffsetMax); 320 st->print_cr( " Page Size Small: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZPageSizeSmall, ZPageSizeSmall); 321 st->print_cr( " Page Size Medium: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZPageSizeMedium, ZPageSizeMedium); 322 st->print_cr( "Metadata Bits"); 323 st->print_cr( " Good: " PTR_FORMAT, ZAddressGoodMask); 324 st->print_cr( " Bad: " PTR_FORMAT, ZAddressBadMask); 325 st->print_cr( " WeakBad: " PTR_FORMAT, ZAddressWeakBadMask); 326 st->print_cr( " Marked: " PTR_FORMAT, ZAddressMetadataMarked); 327 st->print_cr( " Remapped: " PTR_FORMAT, ZAddressMetadataRemapped); 328 } 329 330 void ZCollectedHeap::print_extended_on(outputStream* st) const { 331 _heap.print_extended_on(st); 332 } 333 334 void ZCollectedHeap::print_gc_threads_on(outputStream* st) const { 335 _director->print_on(st); 336 st->cr(); 337 _driver->print_on(st); 338 st->cr(); 339 _stat->print_on(st); 340 st->cr(); 341 _heap.print_worker_threads_on(st); 342 _runtime_workers.print_threads_on(st); 343 } 344 345 void ZCollectedHeap::print_tracing_info() const { 346 // Does nothing 347 } 348 349 void ZCollectedHeap::verify(VerifyOption option /* ignored */) { 350 _heap.verify(); 351 } 352 353 bool ZCollectedHeap::is_oop(oop object) const { 354 return CollectedHeap::is_oop(object) && _heap.is_oop(object); 355 }