1 /*
2 * Copyright (c) 2003, 2017, 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
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "gc/serial/defNewGeneration.hpp"
29 #include "gc/shared/space.hpp"
30 #include "memory/metaspace.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "runtime/handles.inline.hpp"
33 #include "runtime/javaCalls.hpp"
34 #include "runtime/orderAccess.inline.hpp"
35 #include "services/lowMemoryDetector.hpp"
36 #include "services/management.hpp"
37 #include "services/memoryManager.hpp"
38 #include "services/memoryPool.hpp"
39 #include "utilities/globalDefinitions.hpp"
40 #include "utilities/macros.hpp"
41
42 MemoryPool::MemoryPool(const char* name,
43 PoolType type,
44 size_t init_size,
45 size_t max_size,
46 bool support_usage_threshold,
47 bool support_gc_threshold) {
48 _name = name;
49 _initial_size = init_size;
50 _max_size = max_size;
51 (void)const_cast<instanceOop&>(_memory_pool_obj = instanceOop(NULL));
52 _available_for_allocation = true;
53 _num_managers = 0;
54 _type = type;
55
56 // initialize the max and init size of collection usage
57 _after_gc_usage = MemoryUsage(_initial_size, 0, 0, _max_size);
58
59 _usage_sensor = NULL;
60 _gc_usage_sensor = NULL;
61 // usage threshold supports both high and low threshold
62 _usage_threshold = new ThresholdSupport(support_usage_threshold, support_usage_threshold);
63 // gc usage threshold supports only high threshold
64 _gc_usage_threshold = new ThresholdSupport(support_gc_threshold, support_gc_threshold);
65 }
66
67 void MemoryPool::add_manager(MemoryManager* mgr) {
68 assert(_num_managers < MemoryPool::max_num_managers, "_num_managers exceeds the max");
69 if (_num_managers < MemoryPool::max_num_managers) {
70 _managers[_num_managers] = mgr;
71 _num_managers++;
72 }
73 }
74
75
76 // Returns an instanceHandle of a MemoryPool object.
77 // It creates a MemoryPool instance when the first time
78 // this function is called.
79 instanceOop MemoryPool::get_memory_pool_instance(TRAPS) {
80 // Must do an acquire so as to force ordering of subsequent
81 // loads from anything _memory_pool_obj points to or implies.
82 instanceOop pool_obj = OrderAccess::load_acquire(&_memory_pool_obj);
83 if (pool_obj == NULL) {
84 // It's ok for more than one thread to execute the code up to the locked region.
85 // Extra pool instances will just be gc'ed.
86 InstanceKlass* ik = Management::sun_management_ManagementFactoryHelper_klass(CHECK_NULL);
87
88 Handle pool_name = java_lang_String::create_from_str(_name, CHECK_NULL);
89 jlong usage_threshold_value = (_usage_threshold->is_high_threshold_supported() ? 0 : -1L);
90 jlong gc_usage_threshold_value = (_gc_usage_threshold->is_high_threshold_supported() ? 0 : -1L);
91
92 JavaValue result(T_OBJECT);
93 JavaCallArguments args;
94 args.push_oop(pool_name); // Argument 1
95 args.push_int((int) is_heap()); // Argument 2
96
97 Symbol* method_name = vmSymbols::createMemoryPool_name();
98 Symbol* signature = vmSymbols::createMemoryPool_signature();
99
100 args.push_long(usage_threshold_value); // Argument 3
101 args.push_long(gc_usage_threshold_value); // Argument 4
102
103 JavaCalls::call_static(&result,
104 ik,
105 method_name,
106 signature,
107 &args,
108 CHECK_NULL);
109
110 instanceOop p = (instanceOop) result.get_jobject();
111 instanceHandle pool(THREAD, p);
112
113 {
114 // Get lock since another thread may have create the instance
115 MutexLocker ml(Management_lock);
116
117 // Check if another thread has created the pool. We reload
118 // _memory_pool_obj here because some other thread may have
119 // initialized it while we were executing the code before the lock.
120 //
121 // The lock has done an acquire, so the load can't float above it,
122 // but we need to do a load_acquire as above.
123 pool_obj = OrderAccess::load_acquire(&_memory_pool_obj);
124 if (pool_obj != NULL) {
125 return pool_obj;
126 }
127
128 // Get the address of the object we created via call_special.
129 pool_obj = pool();
130
131 // Use store barrier to make sure the memory accesses associated
132 // with creating the pool are visible before publishing its address.
133 // The unlock will publish the store to _memory_pool_obj because
134 // it does a release first.
135 OrderAccess::release_store(&_memory_pool_obj, pool_obj);
136 }
137 }
138
139 return pool_obj;
140 }
141
142 inline static size_t get_max_value(size_t val1, size_t val2) {
143 return (val1 > val2 ? val1 : val2);
144 }
145
146 void MemoryPool::record_peak_memory_usage() {
147 // Caller in JDK is responsible for synchronization -
148 // acquire the lock for this memory pool before calling VM
149 MemoryUsage usage = get_memory_usage();
150 size_t peak_used = get_max_value(usage.used(), _peak_usage.used());
151 size_t peak_committed = get_max_value(usage.committed(), _peak_usage.committed());
152 size_t peak_max_size = get_max_value(usage.max_size(), _peak_usage.max_size());
153
154 _peak_usage = MemoryUsage(initial_size(), peak_used, peak_committed, peak_max_size);
155 }
156
157 static void set_sensor_obj_at(SensorInfo** sensor_ptr, instanceHandle sh) {
158 assert(*sensor_ptr == NULL, "Should be called only once");
159 SensorInfo* sensor = new SensorInfo();
160 sensor->set_sensor(sh());
161 *sensor_ptr = sensor;
162 }
163
164 void MemoryPool::set_usage_sensor_obj(instanceHandle sh) {
165 set_sensor_obj_at(&_usage_sensor, sh);
166 }
167
168 void MemoryPool::set_gc_usage_sensor_obj(instanceHandle sh) {
169 set_sensor_obj_at(&_gc_usage_sensor, sh);
170 }
171
172 void MemoryPool::oops_do(OopClosure* f) {
173 f->do_oop((oop*) &_memory_pool_obj);
174 if (_usage_sensor != NULL) {
175 _usage_sensor->oops_do(f);
176 }
177 if (_gc_usage_sensor != NULL) {
178 _gc_usage_sensor->oops_do(f);
179 }
180 }
181
182 ContiguousSpacePool::ContiguousSpacePool(ContiguousSpace* space,
183 const char* name,
184 PoolType type,
185 size_t max_size,
186 bool support_usage_threshold) :
187 CollectedMemoryPool(name, type, space->capacity(), max_size,
188 support_usage_threshold), _space(space) {
189 }
190
191 size_t ContiguousSpacePool::used_in_bytes() {
192 return space()->used();
193 }
194
195 MemoryUsage ContiguousSpacePool::get_memory_usage() {
196 size_t maxSize = (available_for_allocation() ? max_size() : 0);
197 size_t used = used_in_bytes();
198 size_t committed = _space->capacity();
199
200 return MemoryUsage(initial_size(), used, committed, maxSize);
201 }
202
203 SurvivorContiguousSpacePool::SurvivorContiguousSpacePool(DefNewGeneration* young_gen,
204 const char* name,
205 PoolType type,
206 size_t max_size,
207 bool support_usage_threshold) :
208 CollectedMemoryPool(name, type, young_gen->from()->capacity(), max_size,
209 support_usage_threshold), _young_gen(young_gen) {
210 }
211
212 size_t SurvivorContiguousSpacePool::used_in_bytes() {
213 return _young_gen->from()->used();
214 }
215
216 size_t SurvivorContiguousSpacePool::committed_in_bytes() {
217 return _young_gen->from()->capacity();
218 }
219
220 MemoryUsage SurvivorContiguousSpacePool::get_memory_usage() {
221 size_t maxSize = (available_for_allocation() ? max_size() : 0);
222 size_t used = used_in_bytes();
223 size_t committed = committed_in_bytes();
224
225 return MemoryUsage(initial_size(), used, committed, maxSize);
226 }
227
228 GenerationPool::GenerationPool(Generation* gen,
229 const char* name,
230 PoolType type,
231 bool support_usage_threshold) :
232 CollectedMemoryPool(name, type, gen->capacity(), gen->max_capacity(),
233 support_usage_threshold), _gen(gen) {
234 }
235
236 size_t GenerationPool::used_in_bytes() {
237 return _gen->used();
238 }
239
240 MemoryUsage GenerationPool::get_memory_usage() {
241 size_t used = used_in_bytes();
242 size_t committed = _gen->capacity();
243 size_t maxSize = (available_for_allocation() ? max_size() : 0);
244
245 return MemoryUsage(initial_size(), used, committed, maxSize);
246 }
247
248 CodeHeapPool::CodeHeapPool(CodeHeap* codeHeap, const char* name, bool support_usage_threshold) :
249 MemoryPool(name, NonHeap, codeHeap->capacity(), codeHeap->max_capacity(),
250 support_usage_threshold, false), _codeHeap(codeHeap) {
251 }
252
253 MemoryUsage CodeHeapPool::get_memory_usage() {
254 size_t used = used_in_bytes();
255 size_t committed = _codeHeap->capacity();
256 size_t maxSize = (available_for_allocation() ? max_size() : 0);
257
258 return MemoryUsage(initial_size(), used, committed, maxSize);
259 }
260
261 MetaspacePool::MetaspacePool() :
262 MemoryPool("Metaspace", NonHeap, 0, calculate_max_size(), true, false) { }
263
264 MemoryUsage MetaspacePool::get_memory_usage() {
265 size_t committed = MetaspaceAux::committed_bytes();
266 return MemoryUsage(initial_size(), used_in_bytes(), committed, max_size());
267 }
268
269 size_t MetaspacePool::used_in_bytes() {
270 return MetaspaceAux::used_bytes();
271 }
272
273 size_t MetaspacePool::calculate_max_size() const {
274 return FLAG_IS_CMDLINE(MaxMetaspaceSize) ? MaxMetaspaceSize :
275 MemoryUsage::undefined_size();
276 }
277
278 CompressedKlassSpacePool::CompressedKlassSpacePool() :
279 MemoryPool("Compressed Class Space", NonHeap, 0, CompressedClassSpaceSize, true, false) { }
280
281 size_t CompressedKlassSpacePool::used_in_bytes() {
282 return MetaspaceAux::used_bytes(Metaspace::ClassType);
283 }
284
285 MemoryUsage CompressedKlassSpacePool::get_memory_usage() {
286 size_t committed = MetaspaceAux::committed_bytes(Metaspace::ClassType);
287 return MemoryUsage(initial_size(), used_in_bytes(), committed, max_size());
288 }