1 /*
2 * Copyright (c) 2003, 2017, 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 #ifndef SHARE_VM_SERVICES_MEMORYMANAGER_HPP
26 #define SHARE_VM_SERVICES_MEMORYMANAGER_HPP
27
28 #include "gc/shared/gcCause.hpp"
29 #include "memory/allocation.hpp"
30 #include "oops/oopsHierarchy.hpp"
31 #include "runtime/handles.hpp"
32 #include "runtime/timer.hpp"
33 #include "services/memoryUsage.hpp"
34
35 // A memory manager is responsible for managing one or more memory pools.
36 // The garbage collector is one type of memory managers responsible
37 // for reclaiming memory occupied by unreachable objects. A Java virtual
38 // machine may have one or more memory managers. It may
39 // add or remove memory managers during execution.
40 // A memory pool can be managed by more than one memory managers.
41
42 class MemoryPool;
43 class GCMemoryManager;
44 class OopClosure;
45
46 class MemoryManager : public CHeapObj<mtInternal> {
47 private:
48 enum {
49 max_num_pools = 10
50 };
51
52 MemoryPool* _pools[max_num_pools];
53 int _num_pools;
54
55 const char* _name;
56
57 protected:
58 volatile instanceOop _memory_mgr_obj;
59
60 public:
61 MemoryManager(const char* name);
62
63 int num_memory_pools() const { return _num_pools; }
64 MemoryPool* get_memory_pool(int index) {
65 assert(index >= 0 && index < _num_pools, "Invalid index");
66 return _pools[index];
67 }
68
69 void add_pool(MemoryPool* pool);
70
71 bool is_manager(instanceHandle mh) { return mh() == _memory_mgr_obj; }
72
73 virtual instanceOop get_memory_manager_instance(TRAPS);
74 virtual bool is_gc_memory_manager() { return false; }
75
76 const char* name() const { return _name; }
77
78 // GC support
79 void oops_do(OopClosure* f);
80
81 // Static factory methods to get a memory manager of a specific type
82 static MemoryManager* get_code_cache_memory_manager();
83 static MemoryManager* get_metaspace_memory_manager();
84 };
85
86 class GCStatInfo : public ResourceObj {
87 private:
88 size_t _index;
89 jlong _start_time;
90 jlong _end_time;
91
92 // We keep memory usage of all memory pools
93 MemoryUsage* _before_gc_usage_array;
94 MemoryUsage* _after_gc_usage_array;
95 int _usage_array_size;
96
97 void set_gc_usage(int pool_index, MemoryUsage, bool before_gc);
98
99 public:
100 GCStatInfo(int num_pools);
101 ~GCStatInfo();
102
103 size_t gc_index() { return _index; }
104 jlong start_time() { return _start_time; }
105 jlong end_time() { return _end_time; }
106 int usage_array_size() { return _usage_array_size; }
107 MemoryUsage before_gc_usage_for_pool(int pool_index) {
108 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
109 return _before_gc_usage_array[pool_index];
110 }
111 MemoryUsage after_gc_usage_for_pool(int pool_index) {
112 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
113 return _after_gc_usage_array[pool_index];
114 }
115
116 MemoryUsage* before_gc_usage_array() { return _before_gc_usage_array; }
117 MemoryUsage* after_gc_usage_array() { return _after_gc_usage_array; }
118
119 void set_index(size_t index) { _index = index; }
120 void set_start_time(jlong time) { _start_time = time; }
121 void set_end_time(jlong time) { _end_time = time; }
122 void set_before_gc_usage(int pool_index, MemoryUsage usage) {
123 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
124 set_gc_usage(pool_index, usage, true /* before gc */);
125 }
126 void set_after_gc_usage(int pool_index, MemoryUsage usage) {
127 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
128 set_gc_usage(pool_index, usage, false /* after gc */);
129 }
130
131 void clear();
132 };
133
134 class GCMemoryManager : public MemoryManager {
135 private:
136 // TODO: We should unify the GCCounter and GCMemoryManager statistic
137 size_t _num_collections;
138 elapsedTimer _accumulated_timer;
139 elapsedTimer _gc_timer; // for measuring every GC duration
140 GCStatInfo* _last_gc_stat;
141 Mutex* _last_gc_lock;
142 GCStatInfo* _current_gc_stat;
143 int _num_gc_threads;
144 volatile bool _notification_enabled;
145 const char* _gc_end_message;
146 public:
147 GCMemoryManager(const char* name, const char* gc_end_message);
148 ~GCMemoryManager();
149
150 void initialize_gc_stat_info();
151
152 bool is_gc_memory_manager() { return true; }
153 jlong gc_time_ms() { return _accumulated_timer.milliseconds(); }
154 size_t gc_count() { return _num_collections; }
155 int num_gc_threads() { return _num_gc_threads; }
156 void set_num_gc_threads(int count) { _num_gc_threads = count; }
157
158 void gc_begin(bool recordGCBeginTime, bool recordPreGCUsage,
159 bool recordAccumulatedGCTime);
160 void gc_end(bool recordPostGCUsage, bool recordAccumulatedGCTime,
161 bool recordGCEndTime, bool countCollection, GCCause::Cause cause);
162
163 void reset_gc_stat() { _num_collections = 0; _accumulated_timer.reset(); }
164
165 // Copy out _last_gc_stat to the given destination, returning
166 // the collection count. Zero signifies no gc has taken place.
167 size_t get_last_gc_stat(GCStatInfo* dest);
168
169 void set_notification_enabled(bool enabled) { _notification_enabled = enabled; }
170 bool is_notification_enabled() { return _notification_enabled; }
171 };
172
173 #endif // SHARE_VM_SERVICES_MEMORYMANAGER_HPP