1 /*
2 * Copyright (c) 2003, 2004, 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 // A memory pool represents the memory area that the VM manages.
26 // The Java virtual machine has at least one memory pool
27 // and it may create or remove memory pools during execution.
28 // A memory pool can belong to the heap or the non-heap memory.
29 // A Java virtual machine may also have memory pools belonging to
30 // both heap and non-heap memory.
31
32 // Forward declaration
33 class MemoryManager;
34 class SensorInfo;
35 class Generation;
36 class DefNewGeneration;
37 class PSPermGen;
38 class PermGen;
39 class ThresholdSupport;
40
41 class MemoryPool : public CHeapObj {
42 friend class MemoryManager;
43 public:
44 enum PoolType {
45 Heap = 1,
46 NonHeap = 2
47 };
48
49 private:
50 enum {
51 max_num_managers = 5
52 };
53
54 // We could make some of the following as performance counters
55 // for external monitoring.
56 const char* _name;
57 PoolType _type;
58 size_t _initial_size;
59 size_t _max_size;
60 bool _available_for_allocation; // Default is true
61 MemoryManager* _managers[max_num_managers];
62 int _num_managers;
63 MemoryUsage _peak_usage; // Peak memory usage
64 MemoryUsage _after_gc_usage; // After GC memory usage
65
66 ThresholdSupport* _usage_threshold;
67 ThresholdSupport* _gc_usage_threshold;
68
69 SensorInfo* _usage_sensor;
70 SensorInfo* _gc_usage_sensor;
71
72 volatile instanceOop _memory_pool_obj;
73
74 void add_manager(MemoryManager* mgr);
75
76 public:
77 MemoryPool(const char* name,
78 PoolType type,
79 size_t init_size,
80 size_t max_size,
81 bool support_usage_threshold,
82 bool support_gc_threshold);
83
84 const char* name() { return _name; }
85 bool is_heap() { return _type == Heap; }
86 bool is_non_heap() { return _type == NonHeap; }
87 size_t initial_size() const { return _initial_size; }
88 int num_memory_managers() const { return _num_managers; }
89 // max size could be changed
90 virtual size_t max_size() const { return _max_size; }
91
92 bool is_pool(instanceHandle pool) { return (pool() == _memory_pool_obj); }
93
94 bool available_for_allocation() { return _available_for_allocation; }
95 bool set_available_for_allocation(bool value) {
96 bool prev = _available_for_allocation;
97 _available_for_allocation = value;
98 return prev;
99 }
100
101 MemoryManager* get_memory_manager(int index) {
102 assert(index >= 0 && index < _num_managers, "Invalid index");
103 return _managers[index];
104 }
105
106 // Records current memory usage if it's a peak usage
107 void record_peak_memory_usage();
108
109 MemoryUsage get_peak_memory_usage() {
110 // check current memory usage first and then return peak usage
111 record_peak_memory_usage();
112 return _peak_usage;
113 }
114 void reset_peak_memory_usage() {
115 _peak_usage = get_memory_usage();
116 }
117
118 ThresholdSupport* usage_threshold() { return _usage_threshold; }
119 ThresholdSupport* gc_usage_threshold() { return _gc_usage_threshold; }
120
121 SensorInfo* usage_sensor() { return _usage_sensor; }
122 SensorInfo* gc_usage_sensor() { return _gc_usage_sensor; }
123
124 void set_usage_sensor_obj(instanceHandle s);
125 void set_gc_usage_sensor_obj(instanceHandle s);
126 void set_last_collection_usage(MemoryUsage u) { _after_gc_usage = u; }
127
128 virtual instanceOop get_memory_pool_instance(TRAPS);
129 virtual MemoryUsage get_memory_usage() = 0;
130 virtual size_t used_in_bytes() = 0;
131 virtual bool is_collected_pool() { return false; }
132 virtual MemoryUsage get_last_collection_usage() { return _after_gc_usage; }
133
134 // GC support
135 void oops_do(OopClosure* f);
136 };
137
138 class CollectedMemoryPool : public MemoryPool {
139 public:
140 CollectedMemoryPool(const char* name, PoolType type, size_t init_size, size_t max_size, bool support_usage_threshold) :
141 MemoryPool(name, type, init_size, max_size, support_usage_threshold, true) {};
142 bool is_collected_pool() { return true; }
143 };
144
145 class ContiguousSpacePool : public CollectedMemoryPool {
146 private:
147 ContiguousSpace* _space;
148
149 public:
150 ContiguousSpacePool(ContiguousSpace* space, const char* name, PoolType type, size_t max_size, bool support_usage_threshold);
151
152 ContiguousSpace* space() { return _space; }
153 MemoryUsage get_memory_usage();
154 size_t used_in_bytes() { return space()->used(); }
155 };
156
157 class SurvivorContiguousSpacePool : public CollectedMemoryPool {
158 private:
159 DefNewGeneration* _gen;
160
161 public:
162 SurvivorContiguousSpacePool(DefNewGeneration* gen,
163 const char* name,
164 PoolType type,
165 size_t max_size,
166 bool support_usage_threshold);
167
168 MemoryUsage get_memory_usage();
169
170 size_t used_in_bytes() {
171 return _gen->from()->used();
172 }
173 size_t committed_in_bytes() {
174 return _gen->from()->capacity();
175 }
176 };
177
178 #ifndef SERIALGC
179 class CompactibleFreeListSpacePool : public CollectedMemoryPool {
180 private:
181 CompactibleFreeListSpace* _space;
182 public:
183 CompactibleFreeListSpacePool(CompactibleFreeListSpace* space,
184 const char* name,
185 PoolType type,
186 size_t max_size,
187 bool support_usage_threshold);
188
189 MemoryUsage get_memory_usage();
190 size_t used_in_bytes() { return _space->used(); }
191 };
192 #endif // SERIALGC
193
194
195 class GenerationPool : public CollectedMemoryPool {
196 private:
197 Generation* _gen;
198 public:
199 GenerationPool(Generation* gen, const char* name, PoolType type, bool support_usage_threshold);
200
201 MemoryUsage get_memory_usage();
202 size_t used_in_bytes() { return _gen->used(); }
203 };
204
205 class CodeHeapPool: public MemoryPool {
206 private:
207 CodeHeap* _codeHeap;
208 public:
209 CodeHeapPool(CodeHeap* codeHeap, const char* name, bool support_usage_threshold);
210 MemoryUsage get_memory_usage();
211 size_t used_in_bytes() { return _codeHeap->allocated_capacity(); }
212 };