1 /*
2 * Copyright (c) 2003, 2005, 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 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 G1YoungGen,
59 G1OldGen
60 };
61
62 MemoryManager();
63
64 int num_memory_pools() const { return _num_pools; }
65 MemoryPool* get_memory_pool(int index) {
66 assert(index >= 0 && index < _num_pools, "Invalid index");
67 return _pools[index];
68 }
69
70 void add_pool(MemoryPool* pool);
71
72 bool is_manager(instanceHandle mh) { return mh() == _memory_mgr_obj; }
73
74 virtual instanceOop get_memory_manager_instance(TRAPS);
75 virtual MemoryManager::Name kind() { return MemoryManager::Abstract; }
76 virtual bool is_gc_memory_manager() { return false; }
77 virtual const char* name() = 0;
78
79 // GC support
80 void oops_do(OopClosure* f);
81
82 // Static factory methods to get a memory manager of a specific type
83 static MemoryManager* get_code_cache_memory_manager();
84 static GCMemoryManager* get_copy_memory_manager();
85 static GCMemoryManager* get_msc_memory_manager();
86 static GCMemoryManager* get_parnew_memory_manager();
87 static GCMemoryManager* get_cms_memory_manager();
88 static GCMemoryManager* get_psScavenge_memory_manager();
89 static GCMemoryManager* get_psMarkSweep_memory_manager();
90 static GCMemoryManager* get_g1YoungGen_memory_manager();
91 static GCMemoryManager* get_g1OldGen_memory_manager();
92
93 };
94
95 class CodeCacheMemoryManager : public MemoryManager {
96 private:
97 public:
98 CodeCacheMemoryManager() : MemoryManager() {}
99
100 MemoryManager::Name kind() { return MemoryManager::CodeCache; }
101 const char* name() { return "CodeCacheManager"; }
102 };
103
104 class GCStatInfo : public CHeapObj {
105 private:
106 size_t _index;
107 jlong _start_time;
108 jlong _end_time;
109
110 // We keep memory usage of all memory pools
111 MemoryUsage* _before_gc_usage_array;
112 MemoryUsage* _after_gc_usage_array;
113 int _usage_array_size;
114
115 void set_gc_usage(int pool_index, MemoryUsage, bool before_gc);
116
117 public:
118 GCStatInfo(int num_pools);
119 ~GCStatInfo();
120
121 size_t gc_index() { return _index; }
122 jlong start_time() { return _start_time; }
123 jlong end_time() { return _end_time; }
124 int usage_array_size() { return _usage_array_size; }
125 MemoryUsage before_gc_usage_for_pool(int pool_index) {
126 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
127 return _before_gc_usage_array[pool_index];
128 }
129 MemoryUsage after_gc_usage_for_pool(int pool_index) {
130 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
131 return _after_gc_usage_array[pool_index];
132 }
133
134 MemoryUsage* before_gc_usage_array() { return _before_gc_usage_array; }
135 MemoryUsage* after_gc_usage_array() { return _after_gc_usage_array; }
136
137 void set_index(size_t index) { _index = index; }
138 void set_start_time(jlong time) { _start_time = time; }
139 void set_end_time(jlong time) { _end_time = time; }
140 void set_before_gc_usage(int pool_index, MemoryUsage usage) {
141 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
142 set_gc_usage(pool_index, usage, true /* before gc */);
143 }
144 void set_after_gc_usage(int pool_index, MemoryUsage usage) {
145 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
146 set_gc_usage(pool_index, usage, false /* after gc */);
147 }
148
149 void clear();
150 };
151
152 class GCMemoryManager : public MemoryManager {
153 private:
154 // TODO: We should unify the GCCounter and GCMemoryManager statistic
155 size_t _num_collections;
156 elapsedTimer _accumulated_timer;
157 elapsedTimer _gc_timer; // for measuring every GC duration
158 GCStatInfo* _last_gc_stat;
159 Mutex* _last_gc_lock;
160 GCStatInfo* _current_gc_stat;
161 int _num_gc_threads;
162 public:
163 GCMemoryManager();
164 ~GCMemoryManager();
165
166 void initialize_gc_stat_info();
167
168 bool is_gc_memory_manager() { return true; }
169 jlong gc_time_ms() { return _accumulated_timer.milliseconds(); }
170 size_t gc_count() { return _num_collections; }
171 int num_gc_threads() { return _num_gc_threads; }
172 void set_num_gc_threads(int count) { _num_gc_threads = count; }
173
174 void gc_begin(bool recordGCBeginTime, bool recordPreGCUsage,
175 bool recordAccumulatedGCTime);
176 void gc_end(bool recordPostGCUsage, bool recordAccumulatedGCTime,
177 bool recordGCEndTime, bool countCollection);
178
179 void reset_gc_stat() { _num_collections = 0; _accumulated_timer.reset(); }
180
181 // Copy out _last_gc_stat to the given destination, returning the size of
182 // the arrays of pools. Zero signifies no gc has taken place.
183 size_t get_last_gc_stat(GCStatInfo* dest);
184
185 virtual MemoryManager::Name kind() = 0;
186 };
187
188 // These subclasses of GCMemoryManager are defined to include
189 // GC-specific information.
190 // TODO: Add GC-specific information
191 class CopyMemoryManager : public GCMemoryManager {
192 private:
193 public:
194 CopyMemoryManager() : GCMemoryManager() {}
195
196 MemoryManager::Name kind() { return MemoryManager::Copy; }
197 const char* name() { return "Copy"; }
198 };
199
200 class MSCMemoryManager : public GCMemoryManager {
201 private:
202 public:
203 MSCMemoryManager() : GCMemoryManager() {}
204
205 MemoryManager::Name kind() { return MemoryManager::MarkSweepCompact; }
206 const char* name() { return "MarkSweepCompact"; }
207
208 };
209
210 class ParNewMemoryManager : public GCMemoryManager {
211 private:
212 public:
213 ParNewMemoryManager() : GCMemoryManager() {}
214
215 MemoryManager::Name kind() { return MemoryManager::ParNew; }
216 const char* name() { return "ParNew"; }
217
218 };
219
220 class CMSMemoryManager : public GCMemoryManager {
221 private:
222 public:
223 CMSMemoryManager() : GCMemoryManager() {}
224
225 MemoryManager::Name kind() { return MemoryManager::ConcurrentMarkSweep; }
226 const char* name() { return "ConcurrentMarkSweep";}
227
228 };
229
230 class PSScavengeMemoryManager : public GCMemoryManager {
231 private:
232 public:
233 PSScavengeMemoryManager() : GCMemoryManager() {}
234
235 MemoryManager::Name kind() { return MemoryManager::PSScavenge; }
236 const char* name() { return "PS Scavenge"; }
237
238 };
239
240 class PSMarkSweepMemoryManager : public GCMemoryManager {
241 private:
242 public:
243 PSMarkSweepMemoryManager() : GCMemoryManager() {}
244
245 MemoryManager::Name kind() { return MemoryManager::PSMarkSweep; }
246 const char* name() { return "PS MarkSweep"; }
247 };
248
249 class G1YoungGenMemoryManager : public GCMemoryManager {
250 private:
251 public:
252 G1YoungGenMemoryManager() : GCMemoryManager() {}
253
254 MemoryManager::Name kind() { return MemoryManager::G1YoungGen; }
255 const char* name() { return "G1 Young Generation"; }
256 };
257
258 class G1OldGenMemoryManager : public GCMemoryManager {
259 private:
260 public:
261 G1OldGenMemoryManager() : GCMemoryManager() {}
262
263 MemoryManager::Name kind() { return MemoryManager::G1OldGen; }
264 const char* name() { return "G1 Old Generation"; }
265 };