1 /*
2 * Copyright (c) 2003, 2012, 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 "oops/oop.inline.hpp"
29 #include "runtime/handles.inline.hpp"
30 #include "runtime/javaCalls.hpp"
31 #include "services/lowMemoryDetector.hpp"
32 #include "services/management.hpp"
33 #include "services/memoryManager.hpp"
34 #include "services/memoryPool.hpp"
35 #include "utilities/macros.hpp"
36
37 MemoryPool::MemoryPool(const char* name,
38 PoolType type,
39 size_t init_size,
40 size_t max_size,
41 bool support_usage_threshold,
42 bool support_gc_threshold) {
43 _name = name;
44 _initial_size = init_size;
45 _max_size = max_size;
46 _memory_pool_obj = NULL;
47 _available_for_allocation = true;
48 _num_managers = 0;
49 _type = type;
50
51 // initialize the max and init size of collection usage
52 _after_gc_usage = MemoryUsage(_initial_size, 0, 0, _max_size);
53
54 _usage_sensor = NULL;
55 _gc_usage_sensor = NULL;
56 // usage threshold supports both high and low threshold
57 _usage_threshold = new ThresholdSupport(support_usage_threshold, support_usage_threshold);
58 // gc usage threshold supports only high threshold
59 _gc_usage_threshold = new ThresholdSupport(support_gc_threshold, support_gc_threshold);
60 }
61
62 void MemoryPool::add_manager(MemoryManager* mgr) {
63 assert(_num_managers < MemoryPool::max_num_managers, "_num_managers exceeds the max");
64 if (_num_managers < MemoryPool::max_num_managers) {
65 _managers[_num_managers] = mgr;
66 _num_managers++;
67 }
68 }
69
70
71 // Returns an instanceHandle of a MemoryPool object.
72 // It creates a MemoryPool instance when the first time
73 // this function is called.
74 instanceOop MemoryPool::get_memory_pool_instance(TRAPS) {
75 // Must do an acquire so as to force ordering of subsequent
76 // loads from anything _memory_pool_obj points to or implies.
77 instanceOop pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj);
78 if (pool_obj == NULL) {
79 // It's ok for more than one thread to execute the code up to the locked region.
80 // Extra pool instances will just be gc'ed.
81 Klass* k = Management::sun_management_ManagementFactory_klass(CHECK_NULL);
82 instanceKlassHandle ik(THREAD, k);
83
84 Handle pool_name = java_lang_String::create_from_str(_name, CHECK_NULL);
85 jlong usage_threshold_value = (_usage_threshold->is_high_threshold_supported() ? 0 : -1L);
86 jlong gc_usage_threshold_value = (_gc_usage_threshold->is_high_threshold_supported() ? 0 : -1L);
87
88 JavaValue result(T_OBJECT);
89 JavaCallArguments args;
90 args.push_oop(pool_name); // Argument 1
91 args.push_int((int) is_heap()); // Argument 2
92
93 Symbol* method_name = vmSymbols::createMemoryPool_name();
94 Symbol* signature = vmSymbols::createMemoryPool_signature();
95
96 args.push_long(usage_threshold_value); // Argument 3
97 args.push_long(gc_usage_threshold_value); // Argument 4
98
99 JavaCalls::call_static(&result,
100 ik,
101 method_name,
102 signature,
103 &args,
104 CHECK_NULL);
105
106 instanceOop p = (instanceOop) result.get_jobject();
107 instanceHandle pool(THREAD, p);
108
109 {
110 // Get lock since another thread may have create the instance
111 MutexLocker ml(Management_lock);
112
113 // Check if another thread has created the pool. We reload
114 // _memory_pool_obj here because some other thread may have
115 // initialized it while we were executing the code before the lock.
116 //
117 // The lock has done an acquire, so the load can't float above it,
118 // but we need to do a load_acquire as above.
119 pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj);
120 if (pool_obj != NULL) {
121 return pool_obj;
122 }
123
124 // Get the address of the object we created via call_special.
125 pool_obj = pool();
126
127 // Use store barrier to make sure the memory accesses associated
128 // with creating the pool are visible before publishing its address.
129 // The unlock will publish the store to _memory_pool_obj because
130 // it does a release first.
131 OrderAccess::release_store_ptr(&_memory_pool_obj, pool_obj);
132 }
133 }
134
135 return pool_obj;
136 }
137
138 inline static size_t get_max_value(size_t val1, size_t val2) {
139 return (val1 > val2 ? val1 : val2);
140 }
141
142 void MemoryPool::record_peak_memory_usage() {
143 // Caller in JDK is responsible for synchronization -
144 // acquire the lock for this memory pool before calling VM
145 MemoryUsage usage = get_memory_usage();
146 size_t peak_used = get_max_value(usage.used(), _peak_usage.used());
147 size_t peak_committed = get_max_value(usage.committed(), _peak_usage.committed());
148 size_t peak_max_size = get_max_value(usage.max_size(), _peak_usage.max_size());
149
150 _peak_usage = MemoryUsage(initial_size(), peak_used, peak_committed, peak_max_size);
151 }
152
153 static void set_sensor_obj_at(SensorInfo** sensor_ptr, instanceHandle sh) {
154 assert(*sensor_ptr == NULL, "Should be called only once");
155 SensorInfo* sensor = new SensorInfo();
156 sensor->set_sensor(sh());
157 *sensor_ptr = sensor;
158 }
159
160 void MemoryPool::set_usage_sensor_obj(instanceHandle sh) {
161 set_sensor_obj_at(&_usage_sensor, sh);
162 }
163
164 void MemoryPool::set_gc_usage_sensor_obj(instanceHandle sh) {
165 set_sensor_obj_at(&_gc_usage_sensor, sh);
166 }
167
168 void MemoryPool::oops_do(OopClosure* f) {
169 f->do_oop((oop*) &_memory_pool_obj);
170 if (_usage_sensor != NULL) {
171 _usage_sensor->oops_do(f);
172 }
173 if (_gc_usage_sensor != NULL) {
174 _gc_usage_sensor->oops_do(f);
175 }
176 }
177
178 ContiguousSpacePool::ContiguousSpacePool(ContiguousSpace* space,
179 const char* name,
180 PoolType type,
181 size_t max_size,
182 bool support_usage_threshold) :
183 CollectedMemoryPool(name, type, space->capacity(), max_size,
184 support_usage_threshold), _space(space) {
185 }
186
187 MemoryUsage ContiguousSpacePool::get_memory_usage() {
188 size_t maxSize = (available_for_allocation() ? max_size() : 0);
189 size_t used = used_in_bytes();
190 size_t committed = _space->capacity();
191
192 return MemoryUsage(initial_size(), used, committed, maxSize);
193 }
194
195 SurvivorContiguousSpacePool::SurvivorContiguousSpacePool(DefNewGeneration* gen,
196 const char* name,
197 PoolType type,
198 size_t max_size,
199 bool support_usage_threshold) :
200 CollectedMemoryPool(name, type, gen->from()->capacity(), max_size,
201 support_usage_threshold), _gen(gen) {
202 }
203
204 MemoryUsage SurvivorContiguousSpacePool::get_memory_usage() {
205 size_t maxSize = (available_for_allocation() ? max_size() : 0);
206 size_t used = used_in_bytes();
207 size_t committed = committed_in_bytes();
208
209 return MemoryUsage(initial_size(), used, committed, maxSize);
210 }
211
212 #if INCLUDE_ALL_GCS
213 CompactibleFreeListSpacePool::CompactibleFreeListSpacePool(CompactibleFreeListSpace* space,
214 const char* name,
215 PoolType type,
216 size_t max_size,
217 bool support_usage_threshold) :
218 CollectedMemoryPool(name, type, space->capacity(), max_size,
219 support_usage_threshold), _space(space) {
220 }
221
222 MemoryUsage CompactibleFreeListSpacePool::get_memory_usage() {
223 size_t maxSize = (available_for_allocation() ? max_size() : 0);
224 size_t used = used_in_bytes();
225 size_t committed = _space->capacity();
226
227 return MemoryUsage(initial_size(), used, committed, maxSize);
228 }
229 #endif // INCLUDE_ALL_GCS
230
231 GenerationPool::GenerationPool(Generation* gen,
232 const char* name,
233 PoolType type,
234 bool support_usage_threshold) :
235 CollectedMemoryPool(name, type, gen->capacity(), gen->max_capacity(),
236 support_usage_threshold), _gen(gen) {
237 }
238
239 MemoryUsage GenerationPool::get_memory_usage() {
240 size_t used = used_in_bytes();
241 size_t committed = _gen->capacity();
242 size_t maxSize = (available_for_allocation() ? max_size() : 0);
243
244 return MemoryUsage(initial_size(), used, committed, maxSize);
245 }
246
247 CodeHeapPool::CodeHeapPool(CodeHeap* codeHeap, const char* name, bool support_usage_threshold) :
248 MemoryPool(name, NonHeap, codeHeap->capacity(), codeHeap->max_capacity(),
249 support_usage_threshold, false), _codeHeap(codeHeap) {
250 }
251
252 MemoryUsage CodeHeapPool::get_memory_usage() {
253 size_t used = used_in_bytes();
254 size_t committed = _codeHeap->capacity();
255 size_t maxSize = (available_for_allocation() ? max_size() : 0);
256
257 return MemoryUsage(initial_size(), used, committed, maxSize);
258 }