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 HeapWord* ZCollectedHeap::allocate_new_tlab(size_t min_size, size_t requested_size, size_t* actual_size) {
121 const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(requested_size));
122 const uintptr_t addr = _heap.alloc_tlab(size_in_bytes);
123
124 if (addr != 0) {
125 *actual_size = requested_size;
126 }
127
128 return (HeapWord*)addr;
129 }
130
131 HeapWord* ZCollectedHeap::mem_allocate(size_t size, bool* gc_overhead_limit_was_exceeded) {
132 const size_t size_in_bytes = ZUtils::words_to_bytes(align_object_size(size));
133 return (HeapWord*)_heap.alloc_object(size_in_bytes);
134 }
135
136 MetaWord* ZCollectedHeap::satisfy_failed_metadata_allocation(ClassLoaderData* loader_data,
137 size_t size,
138 Metaspace::MetadataType mdtype) {
139 MetaWord* result;
140
141 // Start asynchronous GC
142 collect(GCCause::_metadata_GC_threshold);
143
144 // Expand and retry allocation
145 result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype);
146 if (result != NULL) {
147 return result;
148 }
149
150 // Start synchronous GC
151 collect(GCCause::_metadata_GC_clear_soft_refs);
152
153 // Retry allocation
154 result = loader_data->metaspace_non_null()->allocate(size, mdtype);
155 if (result != NULL) {
156 return result;
157 }
158
159 // Expand and retry allocation
160 result = loader_data->metaspace_non_null()->expand_and_allocate(size, mdtype);
161 if (result != NULL) {
162 return result;
163 }
164
165 // Out of memory
166 return NULL;
167 }
168
169 void ZCollectedHeap::collect(GCCause::Cause cause) {
170 _driver->collect(cause);
171 }
172
173 void ZCollectedHeap::collect_as_vm_thread(GCCause::Cause cause) {
174 // These collection requests are ignored since ZGC can't run a synchronous
175 // GC cycle from within the VM thread. This is considered benign, since the
176 // only GC causes comming in here should be heap dumper and heap inspector.
177 // However, neither the heap dumper nor the heap inspector really need a GC
178 // to happen, but the result of their heap iterations might in that case be
179 // less accurate since they might include objects that would otherwise have
180 // been collected by a GC.
181 assert(Thread::current()->is_VM_thread(), "Should be the VM thread");
182 guarantee(cause == GCCause::_heap_dump ||
183 cause == GCCause::_heap_inspection, "Invalid cause");
184 }
185
186 void ZCollectedHeap::do_full_collection(bool clear_all_soft_refs) {
187 // Not supported
188 ShouldNotReachHere();
189 }
190
191 bool ZCollectedHeap::supports_tlab_allocation() const {
192 return true;
193 }
194
195 size_t ZCollectedHeap::tlab_capacity(Thread* ignored) const {
196 return _heap.tlab_capacity();
197 }
198
199 size_t ZCollectedHeap::tlab_used(Thread* ignored) const {
200 return _heap.tlab_used();
201 }
202
203 size_t ZCollectedHeap::max_tlab_size() const {
204 return _heap.max_tlab_size();
205 }
206
207 size_t ZCollectedHeap::unsafe_max_tlab_alloc(Thread* ignored) const {
208 return _heap.unsafe_max_tlab_alloc();
209 }
210
211 bool ZCollectedHeap::can_elide_tlab_store_barriers() const {
212 return false;
213 }
214
215 bool ZCollectedHeap::can_elide_initializing_store_barrier(oop new_obj) {
216 // Not supported
217 ShouldNotReachHere();
218 return true;
219 }
220
221 bool ZCollectedHeap::card_mark_must_follow_store() const {
222 // Not supported
223 ShouldNotReachHere();
224 return false;
225 }
226
227 GrowableArray<GCMemoryManager*> ZCollectedHeap::memory_managers() {
228 return GrowableArray<GCMemoryManager*>(1, 1, _heap.serviceability_memory_manager());
229 }
230
231 GrowableArray<MemoryPool*> ZCollectedHeap::memory_pools() {
232 return GrowableArray<MemoryPool*>(1, 1, _heap.serviceability_memory_pool());
233 }
234
235 void ZCollectedHeap::object_iterate(ObjectClosure* cl) {
236 _heap.object_iterate(cl);
237 }
238
239 void ZCollectedHeap::safe_object_iterate(ObjectClosure* cl) {
240 _heap.object_iterate(cl);
241 }
242
243 HeapWord* ZCollectedHeap::block_start(const void* addr) const {
244 return (HeapWord*)_heap.block_start((uintptr_t)addr);
245 }
246
247 size_t ZCollectedHeap::block_size(const HeapWord* addr) const {
248 size_t size_in_bytes = _heap.block_size((uintptr_t)addr);
249 return ZUtils::bytes_to_words(size_in_bytes);
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 assert_locked_or_safepoint(CodeCache_lock);
258 ZNMethodTable::register_nmethod(nm);
259 }
260
261 void ZCollectedHeap::unregister_nmethod(nmethod* nm) {
262 assert_locked_or_safepoint(CodeCache_lock);
263 ZNMethodTable::unregister_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(_stat);
282 _heap.worker_threads_do(tc);
283 _runtime_workers.threads_do(tc);
284 }
285
286 VirtualSpaceSummary ZCollectedHeap::create_heap_space_summary() {
287 const size_t capacity_in_words = capacity() / HeapWordSize;
288 const size_t max_capacity_in_words = max_capacity() / HeapWordSize;
289 return VirtualSpaceSummary(reserved_region().start(),
290 reserved_region().start() + capacity_in_words,
291 reserved_region().start() + max_capacity_in_words);
292 }
293
294 void ZCollectedHeap::prepare_for_verify() {
295 // Does nothing
296 }
297
298 void ZCollectedHeap::print_on(outputStream* st) const {
299 _heap.print_on(st);
300 }
301
302 void ZCollectedHeap::print_on_error(outputStream* st) const {
303 CollectedHeap::print_on_error(st);
304
305 st->print_cr("Address Space");
306 st->print_cr( " Start: " PTR_FORMAT, ZAddressSpaceStart);
307 st->print_cr( " End: " PTR_FORMAT, ZAddressSpaceEnd);
308 st->print_cr( " Size: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZAddressSpaceSize, ZAddressSpaceSize);
309 st->print_cr( "Heap");
310 st->print_cr( " GlobalPhase: %u", ZGlobalPhase);
311 st->print_cr( " GlobalSeqNum: %u", ZGlobalSeqNum);
312 st->print_cr( " Offset Max: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZAddressOffsetMax, ZAddressOffsetMax);
313 st->print_cr( " Page Size Small: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZPageSizeSmall, ZPageSizeSmall);
314 st->print_cr( " Page Size Medium: " SIZE_FORMAT_W(-15) " (" PTR_FORMAT ")", ZPageSizeMedium, ZPageSizeMedium);
315 st->print_cr( "Metadata Bits");
316 st->print_cr( " Good: " PTR_FORMAT, ZAddressGoodMask);
317 st->print_cr( " Bad: " PTR_FORMAT, ZAddressBadMask);
318 st->print_cr( " WeakBad: " PTR_FORMAT, ZAddressWeakBadMask);
319 st->print_cr( " Marked: " PTR_FORMAT, ZAddressMetadataMarked);
320 st->print_cr( " Remapped: " PTR_FORMAT, ZAddressMetadataRemapped);
321 }
322
323 void ZCollectedHeap::print_extended_on(outputStream* st) const {
324 _heap.print_extended_on(st);
325 }
326
327 void ZCollectedHeap::print_gc_threads_on(outputStream* st) const {
328 _director->print_on(st);
329 st->cr();
330 _driver->print_on(st);
331 st->cr();
332 _stat->print_on(st);
333 st->cr();
334 _heap.print_worker_threads_on(st);
335 _runtime_workers.print_threads_on(st);
336 }
337
338 void ZCollectedHeap::print_tracing_info() const {
339 // Does nothing
340 }
341
342 void ZCollectedHeap::verify(VerifyOption option /* ignored */) {
343 _heap.verify();
344 }
345
346 bool ZCollectedHeap::is_oop(oop object) const {
347 return CollectedHeap::is_oop(object) && _heap.is_oop(object);
348 }