1 /*
2 * Copyright (c) 2003, 2010, 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
36 MemoryPool::MemoryPool(const char* name,
37 PoolType type,
38 size_t init_size,
39 size_t max_size,
40 bool support_usage_threshold,
41 bool support_gc_threshold) {
42 _name = name;
43 _initial_size = init_size;
44 _max_size = max_size;
45 _memory_pool_obj = NULL;
46 _available_for_allocation = true;
47 _num_managers = 0;
48 _type = type;
49
50 // initialize the max and init size of collection usage
51 _after_gc_usage = MemoryUsage(_initial_size, 0, 0, _max_size);
52
53 _usage_sensor = NULL;
54 _gc_usage_sensor = NULL;
55 // usage threshold supports both high and low threshold
56 _usage_threshold = new ThresholdSupport(support_usage_threshold, support_usage_threshold);
57 // gc usage threshold supports only high threshold
58 _gc_usage_threshold = new ThresholdSupport(support_gc_threshold, support_gc_threshold);
59 }
60
61 void MemoryPool::add_manager(MemoryManager* mgr) {
62 assert(_num_managers < MemoryPool::max_num_managers, "_num_managers exceeds the max");
63 if (_num_managers < MemoryPool::max_num_managers) {
64 _managers[_num_managers] = mgr;
65 _num_managers++;
66 }
67 }
68
69
70 // Returns an instanceHandle of a MemoryPool object.
71 // It creates a MemoryPool instance when the first time
72 // this function is called.
73 instanceOop MemoryPool::get_memory_pool_instance(TRAPS) {
74 // Must do an acquire so as to force ordering of subsequent
75 // loads from anything _memory_pool_obj points to or implies.
76 instanceOop pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj);
77 if (pool_obj == NULL) {
78 // It's ok for more than one thread to execute the code up to the locked region.
79 // Extra pool instances will just be gc'ed.
80 klassOop k = Management::sun_management_ManagementFactory_klass(CHECK_NULL);
81 instanceKlassHandle ik(THREAD, k);
82
83 Handle pool_name = java_lang_String::create_from_str(_name, CHECK_NULL);
84 jlong usage_threshold_value = (_usage_threshold->is_high_threshold_supported() ? 0 : -1L);
85 jlong gc_usage_threshold_value = (_gc_usage_threshold->is_high_threshold_supported() ? 0 : -1L);
86
87 JavaValue result(T_OBJECT);
88 JavaCallArguments args;
89 args.push_oop(pool_name); // Argument 1
90 args.push_int((int) is_heap()); // Argument 2
91
92 symbolHandle method_name = vmSymbolHandles::createMemoryPool_name();
93 symbolHandle signature = vmSymbolHandles::createMemoryPool_signature();
94
95 args.push_long(usage_threshold_value); // Argument 3
96 args.push_long(gc_usage_threshold_value); // Argument 4
97
98 JavaCalls::call_static(&result,
99 ik,
100 method_name,
101 signature,
102 &args,
103 CHECK_NULL);
104
105 instanceOop p = (instanceOop) result.get_jobject();
106 instanceHandle pool(THREAD, p);
107
108 {
109 // Get lock since another thread may have create the instance
110 MutexLocker ml(Management_lock);
111
112 // Check if another thread has created the pool. We reload
113 // _memory_pool_obj here because some other thread may have
114 // initialized it while we were executing the code before the lock.
115 //
116 // The lock has done an acquire, so the load can't float above it,
117 // but we need to do a load_acquire as above.
118 pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj);
119 if (pool_obj != NULL) {
120 return pool_obj;
121 }
122
123 // Get the address of the object we created via call_special.
124 pool_obj = pool();
125
126 // Use store barrier to make sure the memory accesses associated
127 // with creating the pool are visible before publishing its address.
128 // The unlock will publish the store to _memory_pool_obj because
129 // it does a release first.
130 OrderAccess::release_store_ptr(&_memory_pool_obj, pool_obj);
131 }
132 }
133
134 return pool_obj;
135 }
136
137 inline static size_t get_max_value(size_t val1, size_t val2) {
138 return (val1 > val2 ? val1 : val2);
139 }
140
141 void MemoryPool::record_peak_memory_usage() {
142 // Caller in JDK is responsible for synchronization -
143 // acquire the lock for this memory pool before calling VM
144 MemoryUsage usage = get_memory_usage();
145 size_t peak_used = get_max_value(usage.used(), _peak_usage.used());
146 size_t peak_committed = get_max_value(usage.committed(), _peak_usage.committed());
147 size_t peak_max_size = get_max_value(usage.max_size(), _peak_usage.max_size());
148
149 _peak_usage = MemoryUsage(initial_size(), peak_used, peak_committed, peak_max_size);
150 }
151
152 static void set_sensor_obj_at(SensorInfo** sensor_ptr, instanceHandle sh) {
153 assert(*sensor_ptr == NULL, "Should be called only once");
154 SensorInfo* sensor = new SensorInfo();
155 sensor->set_sensor(sh());
156 *sensor_ptr = sensor;
157 }
158
159 void MemoryPool::set_usage_sensor_obj(instanceHandle sh) {
160 set_sensor_obj_at(&_usage_sensor, sh);
161 }
162
163 void MemoryPool::set_gc_usage_sensor_obj(instanceHandle sh) {
164 set_sensor_obj_at(&_gc_usage_sensor, sh);
165 }
166
167 void MemoryPool::oops_do(OopClosure* f) {
168 f->do_oop((oop*) &_memory_pool_obj);
169 if (_usage_sensor != NULL) {
170 _usage_sensor->oops_do(f);
171 }
172 if (_gc_usage_sensor != NULL) {
173 _gc_usage_sensor->oops_do(f);
174 }
175 }
176
177 ContiguousSpacePool::ContiguousSpacePool(ContiguousSpace* space,
178 const char* name,
179 PoolType type,
180 size_t max_size,
181 bool support_usage_threshold) :
182 CollectedMemoryPool(name, type, space->capacity(), max_size,
183 support_usage_threshold), _space(space) {
184 }
185
186 MemoryUsage ContiguousSpacePool::get_memory_usage() {
187 size_t maxSize = (available_for_allocation() ? max_size() : 0);
188 size_t used = used_in_bytes();
189 size_t committed = _space->capacity();
190
191 return MemoryUsage(initial_size(), used, committed, maxSize);
192 }
193
194 SurvivorContiguousSpacePool::SurvivorContiguousSpacePool(DefNewGeneration* gen,
195 const char* name,
196 PoolType type,
197 size_t max_size,
198 bool support_usage_threshold) :
199 CollectedMemoryPool(name, type, gen->from()->capacity(), max_size,
200 support_usage_threshold), _gen(gen) {
201 }
202
203 MemoryUsage SurvivorContiguousSpacePool::get_memory_usage() {
204 size_t maxSize = (available_for_allocation() ? max_size() : 0);
205 size_t used = used_in_bytes();
206 size_t committed = committed_in_bytes();
207
208 return MemoryUsage(initial_size(), used, committed, maxSize);
209 }
210
211 #ifndef SERIALGC
212 CompactibleFreeListSpacePool::CompactibleFreeListSpacePool(CompactibleFreeListSpace* space,
213 const char* name,
214 PoolType type,
215 size_t max_size,
216 bool support_usage_threshold) :
217 CollectedMemoryPool(name, type, space->capacity(), max_size,
218 support_usage_threshold), _space(space) {
219 }
220
221 MemoryUsage CompactibleFreeListSpacePool::get_memory_usage() {
222 size_t maxSize = (available_for_allocation() ? max_size() : 0);
223 size_t used = used_in_bytes();
224 size_t committed = _space->capacity();
225
226 return MemoryUsage(initial_size(), used, committed, maxSize);
227 }
228 #endif // SERIALGC
229
230 GenerationPool::GenerationPool(Generation* gen,
231 const char* name,
232 PoolType type,
233 bool support_usage_threshold) :
234 CollectedMemoryPool(name, type, gen->capacity(), gen->max_capacity(),
235 support_usage_threshold), _gen(gen) {
236 }
237
238 MemoryUsage GenerationPool::get_memory_usage() {
239 size_t used = used_in_bytes();
240 size_t committed = _gen->capacity();
241 size_t maxSize = (available_for_allocation() ? max_size() : 0);
242
243 return MemoryUsage(initial_size(), used, committed, maxSize);
244 }
245
246 CodeHeapPool::CodeHeapPool(CodeHeap* codeHeap, const char* name, bool support_usage_threshold) :
247 MemoryPool(name, NonHeap, codeHeap->capacity(), codeHeap->max_capacity(),
248 support_usage_threshold, false), _codeHeap(codeHeap) {
249 }
250
251 MemoryUsage CodeHeapPool::get_memory_usage() {
252 size_t used = used_in_bytes();
253 size_t committed = _codeHeap->capacity();
254 size_t maxSize = (available_for_allocation() ? max_size() : 0);
255
256 return MemoryUsage(initial_size(), used, committed, maxSize);
257 }