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comparison src/share/vm/services/memoryManager.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2003-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // A memory manager is responsible for managing one or more memory pools.
26 // The garbage collector is one type of memory managers responsible
27 // for reclaiming memory occupied by unreachable objects. A Java virtual
28 // machine may have one or more memory managers. It may
29 // add or remove memory managers during execution.
30 // A memory pool can be managed by more than one memory managers.
31
32 class MemoryPool;
33 class GCMemoryManager;
34 class OopClosure;
35
36 class MemoryManager : public CHeapObj {
37 private:
38 enum {
39 max_num_pools = 10
40 };
41
42 MemoryPool* _pools[max_num_pools];
43 int _num_pools;
44
45 protected:
46 volatile instanceOop _memory_mgr_obj;
47
48 public:
49 enum Name {
50 Abstract,
51 CodeCache,
52 Copy,
53 MarkSweepCompact,
54 ParNew,
55 ConcurrentMarkSweep,
56 PSScavenge,
57 PSMarkSweep
58 };
59
60 MemoryManager();
61
62 int num_memory_pools() const { return _num_pools; }
63 MemoryPool* get_memory_pool(int index) {
64 assert(index >= 0 && index < _num_pools, "Invalid index");
65 return _pools[index];
66 }
67
68 void add_pool(MemoryPool* pool);
69
70 bool is_manager(instanceHandle mh) { return mh() == _memory_mgr_obj; }
71
72 virtual instanceOop get_memory_manager_instance(TRAPS);
73 virtual MemoryManager::Name kind() { return MemoryManager::Abstract; }
74 virtual bool is_gc_memory_manager() { return false; }
75 virtual const char* name() = 0;
76
77 // GC support
78 void oops_do(OopClosure* f);
79
80 // Static factory methods to get a memory manager of a specific type
81 static MemoryManager* get_code_cache_memory_manager();
82 static GCMemoryManager* get_copy_memory_manager();
83 static GCMemoryManager* get_msc_memory_manager();
84 static GCMemoryManager* get_parnew_memory_manager();
85 static GCMemoryManager* get_cms_memory_manager();
86 static GCMemoryManager* get_psScavenge_memory_manager();
87 static GCMemoryManager* get_psMarkSweep_memory_manager();
88
89 };
90
91 class CodeCacheMemoryManager : public MemoryManager {
92 private:
93 public:
94 CodeCacheMemoryManager() : MemoryManager() {}
95
96 MemoryManager::Name kind() { return MemoryManager::CodeCache; }
97 const char* name() { return "CodeCacheManager"; }
98 };
99
100 class GCStatInfo : public CHeapObj {
101 private:
102 size_t _index;
103 jlong _start_time;
104 jlong _end_time;
105
106 // We keep memory usage of all memory pools
107 MemoryUsage* _before_gc_usage_array;
108 MemoryUsage* _after_gc_usage_array;
109 int _usage_array_size;
110
111 void set_gc_usage(int pool_index, MemoryUsage, bool before_gc);
112
113 public:
114 GCStatInfo(int num_pools);
115 ~GCStatInfo();
116
117 size_t gc_index() { return _index; }
118 jlong start_time() { return _start_time; }
119 jlong end_time() { return _end_time; }
120 int usage_array_size() { return _usage_array_size; }
121 MemoryUsage before_gc_usage_for_pool(int pool_index) {
122 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
123 return _before_gc_usage_array[pool_index];
124 }
125 MemoryUsage after_gc_usage_for_pool(int pool_index) {
126 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
127 return _after_gc_usage_array[pool_index];
128 }
129
130 void set_index(size_t index) { _index = index; }
131 void set_start_time(jlong time) { _start_time = time; }
132 void set_end_time(jlong time) { _end_time = time; }
133 void set_before_gc_usage(int pool_index, MemoryUsage usage) {
134 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
135 set_gc_usage(pool_index, usage, true /* before gc */);
136 }
137 void set_after_gc_usage(int pool_index, MemoryUsage usage) {
138 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
139 set_gc_usage(pool_index, usage, false /* after gc */);
140 }
141
142 void copy_stat(GCStatInfo* stat);
143 };
144
145 class GCMemoryManager : public MemoryManager {
146 private:
147 // TODO: We should unify the GCCounter and GCMemoryManager statistic
148 size_t _num_collections;
149 elapsedTimer _accumulated_timer;
150 elapsedTimer _gc_timer; // for measuring every GC duration
151 GCStatInfo* _last_gc_stat;
152 int _num_gc_threads;
153 public:
154 GCMemoryManager();
155 ~GCMemoryManager();
156
157 void initialize_gc_stat_info();
158
159 bool is_gc_memory_manager() { return true; }
160 jlong gc_time_ms() { return _accumulated_timer.milliseconds(); }
161 size_t gc_count() { return _num_collections; }
162 int num_gc_threads() { return _num_gc_threads; }
163 void set_num_gc_threads(int count) { _num_gc_threads = count; }
164
165 void gc_begin();
166 void gc_end();
167
168 void reset_gc_stat() { _num_collections = 0; _accumulated_timer.reset(); }
169 GCStatInfo* last_gc_stat() { return _last_gc_stat; }
170
171 virtual MemoryManager::Name kind() = 0;
172 };
173
174 // These subclasses of GCMemoryManager are defined to include
175 // GC-specific information.
176 // TODO: Add GC-specific information
177 class CopyMemoryManager : public GCMemoryManager {
178 private:
179 public:
180 CopyMemoryManager() : GCMemoryManager() {}
181
182 MemoryManager::Name kind() { return MemoryManager::Copy; }
183 const char* name() { return "Copy"; }
184 };
185
186 class MSCMemoryManager : public GCMemoryManager {
187 private:
188 public:
189 MSCMemoryManager() : GCMemoryManager() {}
190
191 MemoryManager::Name kind() { return MemoryManager::MarkSweepCompact; }
192 const char* name() { return "MarkSweepCompact"; }
193
194 };
195
196 class ParNewMemoryManager : public GCMemoryManager {
197 private:
198 public:
199 ParNewMemoryManager() : GCMemoryManager() {}
200
201 MemoryManager::Name kind() { return MemoryManager::ParNew; }
202 const char* name() { return "ParNew"; }
203
204 };
205
206 class CMSMemoryManager : public GCMemoryManager {
207 private:
208 public:
209 CMSMemoryManager() : GCMemoryManager() {}
210
211 MemoryManager::Name kind() { return MemoryManager::ConcurrentMarkSweep; }
212 const char* name() { return "ConcurrentMarkSweep";}
213
214 };
215
216 class PSScavengeMemoryManager : public GCMemoryManager {
217 private:
218 public:
219 PSScavengeMemoryManager() : GCMemoryManager() {}
220
221 MemoryManager::Name kind() { return MemoryManager::PSScavenge; }
222 const char* name() { return "PS Scavenge"; }
223
224 };
225
226 class PSMarkSweepMemoryManager : public GCMemoryManager {
227 private:
228 public:
229 PSMarkSweepMemoryManager() : GCMemoryManager() {}
230
231 MemoryManager::Name kind() { return MemoryManager::PSMarkSweep; }
232 const char* name() { return "PS MarkSweep"; }
233 };