1 /* 2 * Copyright (c) 2015, 2018, 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/z/zCollectedHeap.hpp" 27 #include "gc/z/zGlobals.hpp" 28 #include "gc/z/zHeap.inline.hpp" 29 #include "gc/z/zNMethodTable.hpp" 30 #include "gc/z/zServiceability.hpp" 31 #include "gc/z/zStat.hpp" 32 #include "gc/z/zUtils.inline.hpp" 33 #include "runtime/mutexLocker.hpp" 34 35 ZCollectedHeap* ZCollectedHeap::heap() { 36 CollectedHeap* heap = Universe::heap(); 37 assert(heap != NULL, "Uninitialized access to ZCollectedHeap::heap()"); 38 assert(heap->kind() == CollectedHeap::Z, "Invalid name"); 39 return (ZCollectedHeap*)heap; 40 } 41 42 ZCollectedHeap::ZCollectedHeap(ZCollectorPolicy* policy) : 43 _collector_policy(policy), 44 _soft_ref_policy(), 45 _barrier_set(), 46 _initialize(&_barrier_set), 47 _heap(), 48 _director(new ZDirector()), 49 _driver(new ZDriver()), 50 _stat(new ZStat()), 51 _runtime_workers() {} 52 53 CollectedHeap::Name ZCollectedHeap::kind() const { 54 return CollectedHeap::Z; 55 } 56 57 const char* ZCollectedHeap::name() const { 58 return ZGCName; 59 } 60 61 jint ZCollectedHeap::initialize() { 62 if (!_heap.is_initialized()) { 63 return JNI_ENOMEM; 64 } 65 66 initialize_reserved_region((HeapWord*)ZAddressReservedStart(), 67 (HeapWord*)ZAddressReservedEnd()); 68 69 return JNI_OK; 70 } 71 72 void ZCollectedHeap::initialize_serviceability() { 73 _heap.serviceability_initialize(); 74 } 75 76 void ZCollectedHeap::stop() { 77 _director->stop(); 78 _driver->stop(); 79 _stat->stop(); 80 } 81 82 CollectorPolicy* ZCollectedHeap::collector_policy() const { 83 return _collector_policy; 84 } 85 86 SoftRefPolicy* ZCollectedHeap::soft_ref_policy() { 87 return &_soft_ref_policy; 88 } 89 90 size_t ZCollectedHeap::max_capacity() const { 91 return _heap.max_capacity(); 92 } 93 94 size_t ZCollectedHeap::capacity() const { 95 return _heap.capacity(); 96 } 97 98 size_t ZCollectedHeap::used() const { 99 return _heap.used(); 100 } 101 102 bool ZCollectedHeap::is_maximal_no_gc() const { 103 // Not supported 104 ShouldNotReachHere(); 105 return false; 106 } 107 108 bool ZCollectedHeap::is_scavengable(oop obj) { 109 return false; 110 } 111 112 bool ZCollectedHeap::is_in(const void* p) const { 113 return is_in_reserved(p) && _heap.is_in((uintptr_t)p); 114 } 115 116 bool ZCollectedHeap::is_in_closed_subset(const void* p) const { 117 return is_in(p); 118 } 119 120 void ZCollectedHeap::fill_with_dummy_object(HeapWord* start, HeapWord* end, bool zap) { 121 // Does nothing, not a parsable heap 122 } 123 124 HeapWord* ZCollectedHeap::allocate_new_tlab(size_t min_size, size_t requested_size, size_t* actual_size) { 125 const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(requested_size)); 126 const uintptr_t addr = _heap.alloc_tlab(size_in_bytes); 127 128 if (addr != 0) { 129 *actual_size = requested_size; 130 } 131 132 return (HeapWord*)addr; 133 } 134 135 HeapWord* ZCollectedHeap::mem_allocate(size_t size, bool* gc_overhead_limit_was_exceeded) { 136 const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(size)); 137 return (HeapWord*)_heap.alloc_object(size_in_bytes); 138 } 139 140 MetaWord* ZCollectedHeap::satisfy_failed_metadata_allocation(ClassLoaderData* loader_data, 141 size_t size, 142 Metaspace::MetadataType mdtype) { 143 MetaWord* result; 144 145 // Start asynchronous GC 146 collect(GCCause::_metadata_GC_threshold); 147 148 // Expand and retry allocation 149 result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype); 150 if (result != NULL) { 151 return result; 152 } 153 154 // Start synchronous GC 155 collect(GCCause::_metadata_GC_clear_soft_refs); 156 157 // Retry allocation 158 result = loader_data->metaspace_non_null()->allocate(size, mdtype); 159 if (result != NULL) { 160 return result; 161 } 162 163 // Expand and retry allocation 164 result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype); 165 if (result != NULL) { 166 return result; 167 } 168 169 // Out of memory 170 return NULL; 171 } 172 173 void ZCollectedHeap::collect(GCCause::Cause cause) { 174 _driver->collect(cause); 175 } 176 177 void ZCollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { 178 // These collection requests are ignored since ZGC can't run a synchronous 179 // GC cycle from within the VM thread. This is considered benign, since the 180 // only GC causes coming in here should be heap dumper and heap inspector. 181 // However, neither the heap dumper nor the heap inspector really need a GC 182 // to happen, but the result of their heap iterations might in that case be 183 // less accurate since they might include objects that would otherwise have 184 // been collected by a GC. 185 assert(Thread::current()->is_VM_thread(), "Should be the VM thread"); 186 guarantee(cause == GCCause::_heap_dump || 187 cause == GCCause::_heap_inspection, "Invalid cause"); 188 } 189 190 void ZCollectedHeap::do_full_collection(bool clear_all_soft_refs) { 191 // Not supported 192 ShouldNotReachHere(); 193 } 194 195 bool ZCollectedHeap::supports_tlab_allocation() const { 196 return true; 197 } 198 199 size_t ZCollectedHeap::tlab_capacity(Thread* ignored) const { 200 return _heap.tlab_capacity(); 201 } 202 203 size_t ZCollectedHeap::tlab_used(Thread* ignored) const { 204 return _heap.tlab_used(); 205 } 206 207 size_t ZCollectedHeap::max_tlab_size() const { 208 return _heap.max_tlab_size(); 209 } 210 211 size_t ZCollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const { 212 return _heap.unsafe_max_tlab_alloc(); 213 } 214 215 bool ZCollectedHeap::can_elide_tlab_store_barriers() const { 216 return false; 217 } 218 219 bool ZCollectedHeap::can_elide_initializing_store_barrier(oop new_obj) { 220 // Not supported 221 ShouldNotReachHere(); 222 return true; 223 } 224 225 bool ZCollectedHeap::card_mark_must_follow_store() const { 226 // Not supported 227 ShouldNotReachHere(); 228 return false; 229 } 230 231 GrowableArray<GCMemoryManager*> ZCollectedHeap::memory_managers() { 232 return GrowableArray<GCMemoryManager*>(1, 1, _heap.serviceability_memory_manager()); 233 } 234 235 GrowableArray<MemoryPool*> ZCollectedHeap::memory_pools() { 236 return GrowableArray<MemoryPool*>(1, 1, _heap.serviceability_memory_pool()); 237 } 238 239 void ZCollectedHeap::object_iterate(ObjectClosure* cl) { 240 _heap.object_iterate(cl, true /* visit_referents */); 241 } 242 243 void ZCollectedHeap::safe_object_iterate(ObjectClosure* cl) { 244 _heap.object_iterate(cl, true /* visit_referents */); 245 } 246 247 HeapWord* ZCollectedHeap::block_start(const void* addr) const { 248 return (HeapWord*)_heap.block_start((uintptr_t)addr); 249 } 250 251 size_t ZCollectedHeap::block_size(const HeapWord* addr) const { 252 size_t size_in_bytes = _heap.block_size((uintptr_t)addr); 253 return ZUtils::bytes_to_words(size_in_bytes); 254 } 255 256 bool ZCollectedHeap::block_is_obj(const HeapWord* addr) const { 257 return _heap.block_is_obj((uintptr_t)addr); 258 } 259 260 void ZCollectedHeap::register_nmethod(nmethod* nm) { 261 assert_locked_or_safepoint(CodeCache_lock); 262 ZNMethodTable::register_nmethod(nm); 263 } 264 265 void ZCollectedHeap::unregister_nmethod(nmethod* nm) { 266 assert_locked_or_safepoint(CodeCache_lock); 267 ZNMethodTable::unregister_nmethod(nm); 268 } 269 270 void ZCollectedHeap::verify_nmethod(nmethod* nm) { 271 // Does nothing 272 } 273 274 WorkGang* ZCollectedHeap::get_safepoint_workers() { 275 return _runtime_workers.workers(); 276 } 277 278 jlong ZCollectedHeap::millis_since_last_gc() { 279 return ZStatCycle::time_since_last() / MILLIUNITS; 280 } 281 282 void ZCollectedHeap::gc_threads_do(ThreadClosure* tc) const { 283 tc->do_thread(_director); 284 tc->do_thread(_driver); 285 tc->do_thread(_stat); 286 _heap.worker_threads_do(tc); 287 _runtime_workers.threads_do(tc); 288 } 289 290 VirtualSpaceSummary ZCollectedHeap::create_heap_space_summary() { 291 const size_t capacity_in_words = capacity() / HeapWordSize; 292 const size_t max_capacity_in_words = max_capacity() / HeapWordSize; 293 return VirtualSpaceSummary(reserved_region().start(), 294 reserved_region().start() + capacity_in_words, 295 reserved_region().start() + max_capacity_in_words); 296 } 297 298 void ZCollectedHeap::prepare_for_verify() { 299 // Does nothing 300 } 301 302 void ZCollectedHeap::print_on(outputStream* st) const { 303 _heap.print_on(st); 304 } 305 306 void ZCollectedHeap::print_on_error(outputStream* st) const { 307 CollectedHeap::print_on_error(st); 308 309 st->print_cr("Address Space"); 310 st->print_cr( " Start: " PTR_FORMAT, ZAddressSpaceStart); 311 st->print_cr( " End: " PTR_FORMAT, ZAddressSpaceEnd); 312 st->print_cr( " Size: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZAddressSpaceSize, ZAddressSpaceSize); 313 st->print_cr( "Heap"); 314 st->print_cr( " GlobalPhase: %u", ZGlobalPhase); 315 st->print_cr( " GlobalSeqNum: %u", ZGlobalSeqNum); 316 st->print_cr( " Offset Max: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZAddressOffsetMax, ZAddressOffsetMax); 317 st->print_cr( " Page Size Small: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZPageSizeSmall, ZPageSizeSmall); 318 st->print_cr( " Page Size Medium: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZPageSizeMedium, ZPageSizeMedium); 319 st->print_cr( "Metadata Bits"); 320 st->print_cr( " Good: " PTR_FORMAT, ZAddressGoodMask); 321 st->print_cr( " Bad: " PTR_FORMAT, ZAddressBadMask); 322 st->print_cr( " WeakBad: " PTR_FORMAT, ZAddressWeakBadMask); 323 st->print_cr( " Marked: " PTR_FORMAT, ZAddressMetadataMarked); 324 st->print_cr( " Remapped: " PTR_FORMAT, ZAddressMetadataRemapped); 325 } 326 327 void ZCollectedHeap::print_extended_on(outputStream* st) const { 328 _heap.print_extended_on(st); 329 } 330 331 void ZCollectedHeap::print_gc_threads_on(outputStream* st) const { 332 _director->print_on(st); 333 st->cr(); 334 _driver->print_on(st); 335 st->cr(); 336 _stat->print_on(st); 337 st->cr(); 338 _heap.print_worker_threads_on(st); 339 _runtime_workers.print_threads_on(st); 340 } 341 342 void ZCollectedHeap::print_tracing_info() const { 343 // Does nothing 344 } 345 346 void ZCollectedHeap::verify(VerifyOption option /* ignored */) { 347 _heap.verify(); 348 } 349 350 bool ZCollectedHeap::is_oop(oop object) const { 351 return CollectedHeap::is_oop(object) && _heap.is_oop(object); 352 }