Wed, 27 Aug 2014 09:36:55 +0200
Merge
1 /*
2 * Copyright (c) 2003, 2013, 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 */
25 #ifndef SHARE_VM_SERVICES_MEMORYMANAGER_HPP
26 #define SHARE_VM_SERVICES_MEMORYMANAGER_HPP
28 #include "memory/allocation.hpp"
29 #include "runtime/timer.hpp"
30 #include "services/memoryUsage.hpp"
32 // A memory manager is responsible for managing one or more memory pools.
33 // The garbage collector is one type of memory managers responsible
34 // for reclaiming memory occupied by unreachable objects. A Java virtual
35 // machine may have one or more memory managers. It may
36 // add or remove memory managers during execution.
37 // A memory pool can be managed by more than one memory managers.
39 class MemoryPool;
40 class GCMemoryManager;
41 class OopClosure;
43 class MemoryManager : public CHeapObj<mtInternal> {
44 private:
45 enum {
46 max_num_pools = 10
47 };
49 MemoryPool* _pools[max_num_pools];
50 int _num_pools;
52 protected:
53 volatile instanceOop _memory_mgr_obj;
55 public:
56 enum Name {
57 Abstract,
58 CodeCache,
59 Metaspace,
60 Copy,
61 MarkSweepCompact,
62 ParNew,
63 ConcurrentMarkSweep,
64 PSScavenge,
65 PSMarkSweep,
66 G1YoungGen,
67 G1OldGen
68 };
70 MemoryManager();
72 int num_memory_pools() const { return _num_pools; }
73 MemoryPool* get_memory_pool(int index) {
74 assert(index >= 0 && index < _num_pools, "Invalid index");
75 return _pools[index];
76 }
78 void add_pool(MemoryPool* pool);
80 bool is_manager(instanceHandle mh) { return mh() == _memory_mgr_obj; }
82 virtual instanceOop get_memory_manager_instance(TRAPS);
83 virtual MemoryManager::Name kind() { return MemoryManager::Abstract; }
84 virtual bool is_gc_memory_manager() { return false; }
85 virtual const char* name() = 0;
87 // GC support
88 void oops_do(OopClosure* f);
90 // Static factory methods to get a memory manager of a specific type
91 static MemoryManager* get_code_cache_memory_manager();
92 static MemoryManager* get_metaspace_memory_manager();
93 static GCMemoryManager* get_copy_memory_manager();
94 static GCMemoryManager* get_msc_memory_manager();
95 static GCMemoryManager* get_parnew_memory_manager();
96 static GCMemoryManager* get_cms_memory_manager();
97 static GCMemoryManager* get_psScavenge_memory_manager();
98 static GCMemoryManager* get_psMarkSweep_memory_manager();
99 static GCMemoryManager* get_g1YoungGen_memory_manager();
100 static GCMemoryManager* get_g1OldGen_memory_manager();
102 };
104 class CodeCacheMemoryManager : public MemoryManager {
105 private:
106 public:
107 CodeCacheMemoryManager() : MemoryManager() {}
109 MemoryManager::Name kind() { return MemoryManager::CodeCache; }
110 const char* name() { return "CodeCacheManager"; }
111 };
113 class MetaspaceMemoryManager : public MemoryManager {
114 public:
115 MetaspaceMemoryManager() : MemoryManager() {}
117 MemoryManager::Name kind() { return MemoryManager::Metaspace; }
118 const char *name() { return "Metaspace Manager"; }
119 };
121 class GCStatInfo : public ResourceObj {
122 private:
123 size_t _index;
124 jlong _start_time;
125 jlong _end_time;
127 // We keep memory usage of all memory pools
128 MemoryUsage* _before_gc_usage_array;
129 MemoryUsage* _after_gc_usage_array;
130 int _usage_array_size;
132 void set_gc_usage(int pool_index, MemoryUsage, bool before_gc);
134 public:
135 GCStatInfo(int num_pools);
136 ~GCStatInfo();
138 size_t gc_index() { return _index; }
139 jlong start_time() { return _start_time; }
140 jlong end_time() { return _end_time; }
141 int usage_array_size() { return _usage_array_size; }
142 MemoryUsage before_gc_usage_for_pool(int pool_index) {
143 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
144 return _before_gc_usage_array[pool_index];
145 }
146 MemoryUsage after_gc_usage_for_pool(int pool_index) {
147 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
148 return _after_gc_usage_array[pool_index];
149 }
151 MemoryUsage* before_gc_usage_array() { return _before_gc_usage_array; }
152 MemoryUsage* after_gc_usage_array() { return _after_gc_usage_array; }
154 void set_index(size_t index) { _index = index; }
155 void set_start_time(jlong time) { _start_time = time; }
156 void set_end_time(jlong time) { _end_time = time; }
157 void set_before_gc_usage(int pool_index, MemoryUsage usage) {
158 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
159 set_gc_usage(pool_index, usage, true /* before gc */);
160 }
161 void set_after_gc_usage(int pool_index, MemoryUsage usage) {
162 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
163 set_gc_usage(pool_index, usage, false /* after gc */);
164 }
166 void clear();
167 };
169 class GCMemoryManager : public MemoryManager {
170 private:
171 // TODO: We should unify the GCCounter and GCMemoryManager statistic
172 size_t _num_collections;
173 elapsedTimer _accumulated_timer;
174 elapsedTimer _gc_timer; // for measuring every GC duration
175 GCStatInfo* _last_gc_stat;
176 Mutex* _last_gc_lock;
177 GCStatInfo* _current_gc_stat;
178 int _num_gc_threads;
179 volatile bool _notification_enabled;
180 public:
181 GCMemoryManager();
182 ~GCMemoryManager();
184 void initialize_gc_stat_info();
186 bool is_gc_memory_manager() { return true; }
187 jlong gc_time_ms() { return _accumulated_timer.milliseconds(); }
188 size_t gc_count() { return _num_collections; }
189 int num_gc_threads() { return _num_gc_threads; }
190 void set_num_gc_threads(int count) { _num_gc_threads = count; }
192 void gc_begin(bool recordGCBeginTime, bool recordPreGCUsage,
193 bool recordAccumulatedGCTime);
194 void gc_end(bool recordPostGCUsage, bool recordAccumulatedGCTime,
195 bool recordGCEndTime, bool countCollection, GCCause::Cause cause);
197 void reset_gc_stat() { _num_collections = 0; _accumulated_timer.reset(); }
199 // Copy out _last_gc_stat to the given destination, returning
200 // the collection count. Zero signifies no gc has taken place.
201 size_t get_last_gc_stat(GCStatInfo* dest);
203 void set_notification_enabled(bool enabled) { _notification_enabled = enabled; }
204 bool is_notification_enabled() { return _notification_enabled; }
205 virtual MemoryManager::Name kind() = 0;
206 };
208 // These subclasses of GCMemoryManager are defined to include
209 // GC-specific information.
210 // TODO: Add GC-specific information
211 class CopyMemoryManager : public GCMemoryManager {
212 private:
213 public:
214 CopyMemoryManager() : GCMemoryManager() {}
216 MemoryManager::Name kind() { return MemoryManager::Copy; }
217 const char* name() { return "Copy"; }
218 };
220 class MSCMemoryManager : public GCMemoryManager {
221 private:
222 public:
223 MSCMemoryManager() : GCMemoryManager() {}
225 MemoryManager::Name kind() { return MemoryManager::MarkSweepCompact; }
226 const char* name() { return "MarkSweepCompact"; }
228 };
230 class ParNewMemoryManager : public GCMemoryManager {
231 private:
232 public:
233 ParNewMemoryManager() : GCMemoryManager() {}
235 MemoryManager::Name kind() { return MemoryManager::ParNew; }
236 const char* name() { return "ParNew"; }
238 };
240 class CMSMemoryManager : public GCMemoryManager {
241 private:
242 public:
243 CMSMemoryManager() : GCMemoryManager() {}
245 MemoryManager::Name kind() { return MemoryManager::ConcurrentMarkSweep; }
246 const char* name() { return "ConcurrentMarkSweep";}
248 };
250 class PSScavengeMemoryManager : public GCMemoryManager {
251 private:
252 public:
253 PSScavengeMemoryManager() : GCMemoryManager() {}
255 MemoryManager::Name kind() { return MemoryManager::PSScavenge; }
256 const char* name() { return "PS Scavenge"; }
258 };
260 class PSMarkSweepMemoryManager : public GCMemoryManager {
261 private:
262 public:
263 PSMarkSweepMemoryManager() : GCMemoryManager() {}
265 MemoryManager::Name kind() { return MemoryManager::PSMarkSweep; }
266 const char* name() { return "PS MarkSweep"; }
267 };
269 class G1YoungGenMemoryManager : public GCMemoryManager {
270 private:
271 public:
272 G1YoungGenMemoryManager() : GCMemoryManager() {}
274 MemoryManager::Name kind() { return MemoryManager::G1YoungGen; }
275 const char* name() { return "G1 Young Generation"; }
276 };
278 class G1OldGenMemoryManager : public GCMemoryManager {
279 private:
280 public:
281 G1OldGenMemoryManager() : GCMemoryManager() {}
283 MemoryManager::Name kind() { return MemoryManager::G1OldGen; }
284 const char* name() { return "G1 Old Generation"; }
285 };
287 #endif // SHARE_VM_SERVICES_MEMORYMANAGER_HPP