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 "memory/metaspace/classLoaderMetaspace.hpp"
35 #include "memory/metaspace/metaspaceEnums.hpp"
36 #include "memory/universe.hpp"
37 #include "runtime/mutexLocker.hpp"
38
39 ZCollectedHeap* ZCollectedHeap::heap() {
40 CollectedHeap* heap = Universe::heap();
41 assert(heap != NULL, "Uninitialized access to ZCollectedHeap::heap()");
42 assert(heap->kind() == CollectedHeap::Z, "Invalid name");
43 return (ZCollectedHeap*)heap;
44 }
45
46 ZCollectedHeap::ZCollectedHeap() :
47 _soft_ref_policy(),
48 _barrier_set(),
49 _initialize(&_barrier_set),
50 _heap(),
51 _director(new ZDirector()),
52 _driver(new ZDriver()),
53 _uncommitter(new ZUncommitter()),
54 _stat(new ZStat()),
55 _runtime_workers() {}
56
57 CollectedHeap::Name ZCollectedHeap::kind() const {
58 return CollectedHeap::Z;
59 }
60
61 const char* ZCollectedHeap::name() const {
62 return ZName;
63 }
64
65 jint ZCollectedHeap::initialize() {
66 if (!_heap.is_initialized()) {
67 return JNI_ENOMEM;
68 }
69
70 initialize_reserved_region((HeapWord*)ZAddressReservedStart,
71 (HeapWord*)ZAddressReservedEnd);
72
73 return JNI_OK;
74 }
75
76 void ZCollectedHeap::initialize_serviceability() {
77 _heap.serviceability_initialize();
78 }
79
80 void ZCollectedHeap::stop() {
81 _director->stop();
82 _driver->stop();
83 _uncommitter->stop();
84 _stat->stop();
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 size_t ZCollectedHeap::unused() const {
104 return _heap.unused();
105 }
106
107 bool ZCollectedHeap::is_maximal_no_gc() const {
108 // Not supported
109 ShouldNotReachHere();
110 return false;
111 }
112
113 bool ZCollectedHeap::is_in(const void* p) const {
114 return _heap.is_in((uintptr_t)p);
115 }
116
117 uint32_t ZCollectedHeap::hash_oop(oop obj) const {
118 return _heap.hash_oop(obj);
119 }
120
121 HeapWord* ZCollectedHeap::allocate_new_tlab(size_t min_size, size_t requested_size, size_t* actual_size) {
122 const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(requested_size));
123 const uintptr_t addr = _heap.alloc_tlab(size_in_bytes);
124
125 if (addr != 0) {
126 *actual_size = requested_size;
127 }
128
129 return (HeapWord*)addr;
130 }
131
132 HeapWord* ZCollectedHeap::mem_allocate(size_t size, bool* gc_overhead_limit_was_exceeded) {
133 const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(size));
134 return (HeapWord*)_heap.alloc_object(size_in_bytes);
135 }
136
137 MetaWord* ZCollectedHeap::satisfy_failed_metadata_allocation(ClassLoaderData* loader_data,
138 size_t size,
139 metaspace::MetadataType mdtype) {
140 MetaWord* result;
141
142 // Start asynchronous GC
143 collect(GCCause::_metadata_GC_threshold);
144
145 // Expand and retry allocation
146 result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype);
147 if (result != NULL) {
148 return result;
149 }
150
151 // Start synchronous GC
152 collect(GCCause::_metadata_GC_clear_soft_refs);
153
154 // Retry allocation
155 result = loader_data->metaspace_non_null()->allocate(size, mdtype);
156 if (result != NULL) {
157 return result;
158 }
159
160 // Expand and retry allocation
161 result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype);
162 if (result != NULL) {
163 return result;
164 }
165
166 // Out of memory
167 return NULL;
168 }
169
170 void ZCollectedHeap::collect(GCCause::Cause cause) {
171 _driver->collect(cause);
172 }
173
174 void ZCollectedHeap::collect_as_vm_thread(GCCause::Cause cause) {
175 // These collection requests are ignored since ZGC can't run a synchronous
176 // GC cycle from within the VM thread. This is considered benign, since the
177 // only GC causes coming in here should be heap dumper and heap inspector.
178 // However, neither the heap dumper nor the heap inspector really need a GC
179 // to happen, but the result of their heap iterations might in that case be
180 // less accurate since they might include objects that would otherwise have
181 // been collected by a GC.
182 assert(Thread::current()->is_VM_thread(), "Should be the VM thread");
183 guarantee(cause == GCCause::_heap_dump ||
184 cause == GCCause::_heap_inspection, "Invalid cause");
185 }
186
187 void ZCollectedHeap::do_full_collection(bool clear_all_soft_refs) {
188 // Not supported
189 ShouldNotReachHere();
190 }
191
192 bool ZCollectedHeap::supports_tlab_allocation() const {
193 return true;
194 }
195
196 size_t ZCollectedHeap::tlab_capacity(Thread* ignored) const {
197 return _heap.tlab_capacity();
198 }
199
200 size_t ZCollectedHeap::tlab_used(Thread* ignored) const {
201 return _heap.tlab_used();
202 }
203
204 size_t ZCollectedHeap::max_tlab_size() const {
205 return _heap.max_tlab_size();
206 }
207
208 size_t ZCollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const {
209 return _heap.unsafe_max_tlab_alloc();
210 }
211
212 bool ZCollectedHeap::can_elide_tlab_store_barriers() const {
213 return false;
214 }
215
216 bool ZCollectedHeap::can_elide_initializing_store_barrier(oop new_obj) {
217 // Not supported
218 ShouldNotReachHere();
219 return true;
220 }
221
222 bool ZCollectedHeap::card_mark_must_follow_store() const {
223 // Not supported
224 ShouldNotReachHere();
225 return false;
226 }
227
228 GrowableArray<GCMemoryManager*> ZCollectedHeap::memory_managers() {
229 return GrowableArray<GCMemoryManager*>(1, 1, _heap.serviceability_memory_manager());
230 }
231
232 GrowableArray<MemoryPool*> ZCollectedHeap::memory_pools() {
233 return GrowableArray<MemoryPool*>(1, 1, _heap.serviceability_memory_pool());
234 }
235
236 void ZCollectedHeap::object_iterate(ObjectClosure* cl) {
237 _heap.object_iterate(cl, true /* visit_weaks */);
238 }
239
240 void ZCollectedHeap::safe_object_iterate(ObjectClosure* cl) {
241 _heap.object_iterate(cl, true /* visit_weaks */);
242 }
243
244 HeapWord* ZCollectedHeap::block_start(const void* addr) const {
245 return (HeapWord*)_heap.block_start((uintptr_t)addr);
246 }
247
248 bool ZCollectedHeap::block_is_obj(const HeapWord* addr) const {
249 return _heap.block_is_obj((uintptr_t)addr);
250 }
251
252 void ZCollectedHeap::register_nmethod(nmethod* nm) {
253 ZNMethod::register_nmethod(nm);
254 }
255
256 void ZCollectedHeap::unregister_nmethod(nmethod* nm) {
257 ZNMethod::unregister_nmethod(nm);
258 }
259
260 void ZCollectedHeap::flush_nmethod(nmethod* nm) {
261 ZNMethod::flush_nmethod(nm);
262 }
263
264 void ZCollectedHeap::verify_nmethod(nmethod* nm) {
265 // Does nothing
266 }
267
268 WorkGang* ZCollectedHeap::get_safepoint_workers() {
269 return _runtime_workers.workers();
270 }
271
272 jlong ZCollectedHeap::millis_since_last_gc() {
273 return ZStatCycle::time_since_last() / MILLIUNITS;
274 }
275
276 void ZCollectedHeap::gc_threads_do(ThreadClosure* tc) const {
277 tc->do_thread(_director);
278 tc->do_thread(_driver);
279 tc->do_thread(_uncommitter);
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 _uncommitter->print_on(st);
340 st->cr();
341 _stat->print_on(st);
342 st->cr();
343 _heap.print_worker_threads_on(st);
344 _runtime_workers.print_threads_on(st);
345 }
346
347 void ZCollectedHeap::print_tracing_info() const {
348 // Does nothing
349 }
350
351 void ZCollectedHeap::verify(VerifyOption option /* ignored */) {
352 _heap.verify();
353 }
354
355 bool ZCollectedHeap::is_oop(oop object) const {
356 return CollectedHeap::is_oop(object) && _heap.is_oop(object);
357 }