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/locationPrinter.hpp" 27 #include "gc/shared/suspendibleThreadSet.hpp" 28 #include "gc/z/zCollectedHeap.hpp" 29 #include "gc/z/zGlobals.hpp" 30 #include "gc/z/zHeap.inline.hpp" 31 #include "gc/z/zNMethod.hpp" 32 #include "gc/z/zObjArrayAllocator.hpp" 33 #include "gc/z/zServiceability.hpp" 34 #include "gc/z/zStat.hpp" 35 #include "gc/z/zUtils.inline.hpp" 36 #include "memory/universe.hpp" 37 #include "runtime/mutexLocker.hpp" 38 #include "utilities/align.hpp" 39 40 ZCollectedHeap* ZCollectedHeap::heap() { 41 CollectedHeap* heap = Universe::heap(); 42 assert(heap != NULL, "Uninitialized access to ZCollectedHeap::heap()"); 43 assert(heap->kind() == CollectedHeap::Z, "Invalid name"); 44 return (ZCollectedHeap*)heap; 45 } 46 47 ZCollectedHeap::ZCollectedHeap() : 48 _soft_ref_policy(), 49 _barrier_set(), 50 _initialize(&_barrier_set), 51 _heap(), 52 _director(new ZDirector()), 53 _driver(new ZDriver()), 54 _uncommitter(new ZUncommitter()), 55 _stat(new ZStat()), 56 _runtime_workers() {} 57 58 CollectedHeap::Name ZCollectedHeap::kind() const { 59 return CollectedHeap::Z; 60 } 61 62 const char* ZCollectedHeap::name() const { 63 return ZName; 64 } 65 66 jint ZCollectedHeap::initialize() { 67 if (!_heap.is_initialized()) { 68 return JNI_ENOMEM; 69 } 70 71 Universe::calculate_verify_data((HeapWord*)ZAddressReservedStart, 72 (HeapWord*)ZAddressReservedEnd); 73 74 return JNI_OK; 75 } 76 77 void ZCollectedHeap::initialize_serviceability() { 78 _heap.serviceability_initialize(); 79 } 80 81 void ZCollectedHeap::stop() { 82 _director->stop(); 83 _driver->stop(); 84 _uncommitter->stop(); 85 _stat->stop(); 86 } 87 88 SoftRefPolicy* ZCollectedHeap::soft_ref_policy() { 89 return &_soft_ref_policy; 90 } 91 92 size_t ZCollectedHeap::max_capacity() const { 93 return _heap.max_capacity(); 94 } 95 96 size_t ZCollectedHeap::capacity() const { 97 return _heap.capacity(); 98 } 99 100 size_t ZCollectedHeap::used() const { 101 return _heap.used(); 102 } 103 104 size_t ZCollectedHeap::unused() const { 105 return _heap.unused(); 106 } 107 108 bool ZCollectedHeap::is_maximal_no_gc() const { 109 // Not supported 110 ShouldNotReachHere(); 111 return false; 112 } 113 114 bool ZCollectedHeap::is_in(const void* p) const { 115 return _heap.is_in((uintptr_t)p); 116 } 117 118 uint32_t ZCollectedHeap::hash_oop(oop obj) const { 119 return _heap.hash_oop(obj); 120 } 121 122 HeapWord* ZCollectedHeap::allocate_new_tlab(size_t min_size, size_t requested_size, size_t* actual_size) { 123 const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(requested_size)); 124 const uintptr_t addr = _heap.alloc_tlab(size_in_bytes); 125 126 if (addr != 0) { 127 *actual_size = requested_size; 128 } 129 130 return (HeapWord*)addr; 131 } 132 133 oop ZCollectedHeap::array_allocate(Klass* klass, int size, int length, bool do_zero, TRAPS) { 134 if (!do_zero) { 135 return CollectedHeap::array_allocate(klass, size, length, false /* do_zero */, THREAD); 136 } 137 138 ZObjArrayAllocator allocator(klass, size, length, THREAD); 139 return allocator.allocate(); 140 } 141 142 HeapWord* ZCollectedHeap::mem_allocate(size_t size, bool* gc_overhead_limit_was_exceeded) { 143 const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(size)); 144 return (HeapWord*)_heap.alloc_object(size_in_bytes); 145 } 146 147 MetaWord* ZCollectedHeap::satisfy_failed_metadata_allocation(ClassLoaderData* loader_data, 148 size_t size, 149 Metaspace::MetadataType mdtype) { 150 MetaWord* result; 151 152 // Start asynchronous GC 153 collect(GCCause::_metadata_GC_threshold); 154 155 // Expand and retry allocation 156 result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype); 157 if (result != NULL) { 158 return result; 159 } 160 161 // Start synchronous GC 162 collect(GCCause::_metadata_GC_clear_soft_refs); 163 164 // Retry allocation 165 result = loader_data->metaspace_non_null()->allocate(size, mdtype); 166 if (result != NULL) { 167 return result; 168 } 169 170 // Expand and retry allocation 171 result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype); 172 if (result != NULL) { 173 return result; 174 } 175 176 // Out of memory 177 return NULL; 178 } 179 180 void ZCollectedHeap::collect(GCCause::Cause cause) { 181 _driver->collect(cause); 182 } 183 184 void ZCollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { 185 // These collection requests are ignored since ZGC can't run a synchronous 186 // GC cycle from within the VM thread. This is considered benign, since the 187 // only GC causes coming in here should be heap dumper and heap inspector. 188 // However, neither the heap dumper nor the heap inspector really need a GC 189 // to happen, but the result of their heap iterations might in that case be 190 // less accurate since they might include objects that would otherwise have 191 // been collected by a GC. 192 assert(Thread::current()->is_VM_thread(), "Should be the VM thread"); 193 guarantee(cause == GCCause::_heap_dump || 194 cause == GCCause::_heap_inspection, "Invalid cause"); 195 } 196 197 void ZCollectedHeap::do_full_collection(bool clear_all_soft_refs) { 198 // Not supported 199 ShouldNotReachHere(); 200 } 201 202 bool ZCollectedHeap::supports_tlab_allocation() const { 203 return true; 204 } 205 206 size_t ZCollectedHeap::tlab_capacity(Thread* ignored) const { 207 return _heap.tlab_capacity(); 208 } 209 210 size_t ZCollectedHeap::tlab_used(Thread* ignored) const { 211 return _heap.tlab_used(); 212 } 213 214 size_t ZCollectedHeap::max_tlab_size() const { 215 return _heap.max_tlab_size(); 216 } 217 218 size_t ZCollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { 219 return _heap.unsafe_max_tlab_alloc(); 220 } 221 222 bool ZCollectedHeap::can_elide_tlab_store_barriers() const { 223 return false; 224 } 225 226 bool ZCollectedHeap::can_elide_initializing_store_barrier(oop new_obj) { 227 // Not supported 228 ShouldNotReachHere(); 229 return true; 230 } 231 232 bool ZCollectedHeap::card_mark_must_follow_store() const { 233 // Not supported 234 ShouldNotReachHere(); 235 return false; 236 } 237 238 GrowableArray<GCMemoryManager*> ZCollectedHeap::memory_managers() { 239 return GrowableArray<GCMemoryManager*>(1, 1, _heap.serviceability_memory_manager()); 240 } 241 242 GrowableArray<MemoryPool*> ZCollectedHeap::memory_pools() { 243 return GrowableArray<MemoryPool*>(1, 1, _heap.serviceability_memory_pool()); 244 } 245 246 void ZCollectedHeap::object_iterate(ObjectClosure* cl) { 247 _heap.object_iterate(cl, true /* visit_weaks */); 248 } 249 250 void ZCollectedHeap::safe_object_iterate(ObjectClosure* cl) { 251 _heap.object_iterate(cl, true /* visit_weaks */); 252 } 253 254 void ZCollectedHeap::register_nmethod(nmethod* nm) { 255 ZNMethod::register_nmethod(nm); 256 } 257 258 void ZCollectedHeap::unregister_nmethod(nmethod* nm) { 259 ZNMethod::unregister_nmethod(nm); 260 } 261 262 void ZCollectedHeap::flush_nmethod(nmethod* nm) { 263 ZNMethod::flush_nmethod(nm); 264 } 265 266 void ZCollectedHeap::verify_nmethod(nmethod* nm) { 267 // Does nothing 268 } 269 270 WorkGang* ZCollectedHeap::get_safepoint_workers() { 271 return _runtime_workers.workers(); 272 } 273 274 jlong ZCollectedHeap::millis_since_last_gc() { 275 return ZStatCycle::time_since_last() / MILLIUNITS; 276 } 277 278 void ZCollectedHeap::gc_threads_do(ThreadClosure* tc) const { 279 tc->do_thread(_director); 280 tc->do_thread(_driver); 281 tc->do_thread(_uncommitter); 282 tc->do_thread(_stat); 283 _heap.worker_threads_do(tc); 284 _runtime_workers.threads_do(tc); 285 } 286 287 VirtualSpaceSummary ZCollectedHeap::create_heap_space_summary() { 288 const size_t capacity_in_words = capacity() / HeapWordSize; 289 const size_t max_capacity_in_words = max_capacity() / HeapWordSize; 290 HeapWord* const heap_start = (HeapWord*)ZAddressReservedStart; 291 return VirtualSpaceSummary(heap_start, 292 heap_start + capacity_in_words, 293 heap_start + max_capacity_in_words); 294 } 295 296 void ZCollectedHeap::safepoint_synchronize_begin() { 297 SuspendibleThreadSet::synchronize(); 298 } 299 300 void ZCollectedHeap::safepoint_synchronize_end() { 301 SuspendibleThreadSet::desynchronize(); 302 } 303 304 void ZCollectedHeap::prepare_for_verify() { 305 // Does nothing 306 } 307 308 void ZCollectedHeap::print_on(outputStream* st) const { 309 _heap.print_on(st); 310 } 311 312 void ZCollectedHeap::print_on_error(outputStream* st) const { 313 CollectedHeap::print_on_error(st); 314 315 st->print_cr("Address Space"); 316 st->print_cr( " Start: " PTR_FORMAT, ZAddressSpaceStart); 317 st->print_cr( " End: " PTR_FORMAT, ZAddressSpaceEnd); 318 st->print_cr( " Size: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZAddressSpaceSize, ZAddressSpaceSize); 319 st->print_cr( "Heap"); 320 st->print_cr( " GlobalPhase: %u", ZGlobalPhase); 321 st->print_cr( " GlobalSeqNum: %u", ZGlobalSeqNum); 322 st->print_cr( " Offset Max: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZAddressOffsetMax, ZAddressOffsetMax); 323 st->print_cr( " Page Size Small: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZPageSizeSmall, ZPageSizeSmall); 324 st->print_cr( " Page Size Medium: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZPageSizeMedium, ZPageSizeMedium); 325 st->print_cr( "Metadata Bits"); 326 st->print_cr( " Good: " PTR_FORMAT, ZAddressGoodMask); 327 st->print_cr( " Bad: " PTR_FORMAT, ZAddressBadMask); 328 st->print_cr( " WeakBad: " PTR_FORMAT, ZAddressWeakBadMask); 329 st->print_cr( " Marked: " PTR_FORMAT, ZAddressMetadataMarked); 330 st->print_cr( " Remapped: " PTR_FORMAT, ZAddressMetadataRemapped); 331 } 332 333 void ZCollectedHeap::print_extended_on(outputStream* st) const { 334 _heap.print_extended_on(st); 335 } 336 337 void ZCollectedHeap::print_gc_threads_on(outputStream* st) const { 338 _director->print_on(st); 339 st->cr(); 340 _driver->print_on(st); 341 st->cr(); 342 _uncommitter->print_on(st); 343 st->cr(); 344 _stat->print_on(st); 345 st->cr(); 346 _heap.print_worker_threads_on(st); 347 _runtime_workers.print_threads_on(st); 348 } 349 350 void ZCollectedHeap::print_tracing_info() const { 351 // Does nothing 352 } 353 354 bool ZCollectedHeap::print_location(outputStream* st, void* addr) const { 355 if (LocationPrinter::is_valid_obj(addr)) { 356 st->print(INTPTR_FORMAT " is a %s oop: ", p2i(addr), 357 ZAddress::is_good(reinterpret_cast<uintptr_t>(addr)) ? "good" : "bad"); 358 cast_to_oop(addr)->print_on(st); 359 return true; 360 } 361 return false; 362 } 363 364 void ZCollectedHeap::verify(VerifyOption option /* ignored */) { 365 _heap.verify(); 366 } 367 368 bool ZCollectedHeap::is_oop_location(void* addr) const { 369 return is_object_aligned(addr) && 370 (uintptr_t)addr >= ZAddressSpaceStart && 371 (uintptr_t)addr < ZAddressSpaceEnd; 372 } 373 374 bool ZCollectedHeap::is_oop(oop object) const { 375 return CollectedHeap::is_oop(object) && _heap.is_oop(object); 376 }