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