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