1 /* 2 * Copyright (c) 2016, 2019, 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 #ifndef SHARE_VM_JFR_RECORDER_STORAGE_JFRMEMORYSPACE_HPP 25 #define SHARE_VM_JFR_RECORDER_STORAGE_JFRMEMORYSPACE_HPP 26 27 #include "jfr/utilities/jfrAllocation.hpp" 28 #include "jfr/utilities/jfrDoublyLinkedList.hpp" 29 #include "jfr/utilities/jfrIterator.hpp" 30 #include "jfr/utilities/jfrTypes.hpp" 31 #include "runtime/os.hpp" 32 #include "utilities/globalDefinitions.hpp" 33 #include "utilities/macros.hpp" 34 35 template <typename T, template <typename> class RetrievalType, typename Callback> 36 class JfrMemorySpace : public JfrCHeapObj { 37 public: 38 typedef T Type; 39 typedef RetrievalType<JfrMemorySpace<T, RetrievalType, Callback> > Retrieval; 40 typedef JfrDoublyLinkedList<Type> List; 41 typedef StopOnNullIterator<List> Iterator; 42 private: 43 List _free; 44 List _full; 45 size_t _min_elem_size; 46 size_t _limit_size; 47 size_t _cache_count; 48 Callback* _callback; 49 50 bool should_populate_cache() const { return _free.count() < _cache_count; } 51 52 public: 53 JfrMemorySpace(size_t min_elem_size, size_t limit_size, size_t cache_count, Callback* callback); 54 ~JfrMemorySpace(); 55 bool initialize(); 56 57 size_t min_elem_size() const { return _min_elem_size; } 58 size_t limit_size() const { return _limit_size; } 59 60 bool has_full() const { return _full.head() != NULL; } 61 bool has_free() const { return _free.head() != NULL; } 62 bool is_full_empty() const { return !has_full(); } 63 bool is_free_empty() const { return !has_free(); } 64 65 size_t full_count() const { return _full.count(); } 66 size_t free_count() const { return _free.count(); } 67 68 List& full() { return _full; } 69 const List& full() const { return _full; } 70 List& free() { return _free; } 71 const List& free() const { return _free; } 72 73 Type* full_head() { return _full.head(); } 74 Type* full_tail() { return _full.tail(); } 75 Type* free_head() { return _free.head(); } 76 Type* free_tail() { return _free.tail(); } 77 78 void insert_free_head(Type* t) { _free.prepend(t); } 79 void insert_free_tail(Type* t) { _free.append(t); } 80 void insert_free_tail(Type* t, Type* tail, size_t count) { _free.append_list(t, tail, count); } 81 void insert_full_head(Type* t) { _full.prepend(t); } 82 void insert_full_tail(Type* t) { _full.append(t); } 83 void insert_full_tail(Type* t, Type* tail, size_t count) { _full.append_list(t, tail, count); } 84 85 Type* remove_free(Type* t) { return _free.remove(t); } 86 Type* remove_full(Type* t) { return _full.remove(t); } 87 Type* remove_free_tail() { _free.remove(_free.tail()); } 88 Type* remove_full_tail() { return _full.remove(_full.tail()); } 89 Type* clear_full(bool return_tail = false) { return _full.clear(return_tail); } 90 Type* clear_free(bool return_tail = false) { return _free.clear(return_tail); } 91 void release(Type* t); 92 93 void register_full(Type* t, Thread* thread) { _callback->register_full(t, thread); } 94 void lock() { _callback->lock(); } 95 void unlock() { _callback->unlock(); } 96 97 Type* allocate(size_t size); 98 void deallocate(Type* t); 99 Type* get(size_t size, Thread* thread) { return Retrieval::get(size, this, thread); } 100 101 template <typename IteratorCallback, typename IteratorType> 102 void iterate(IteratorCallback& callback, bool full = true, jfr_iter_direction direction = forward); 103 104 debug_only(bool in_full_list(const Type* t) const { return _full.in_list(t); }) 105 debug_only(bool in_free_list(const Type* t) const { return _free.in_list(t); }) 106 }; 107 108 // allocations are even multiples of the mspace min size 109 inline u8 align_allocation_size(u8 requested_size, size_t min_elem_size) { 110 assert((int)min_elem_size % os::vm_page_size() == 0, "invariant"); 111 u8 alloc_size_bytes = min_elem_size; 112 while (requested_size > alloc_size_bytes) { 113 alloc_size_bytes <<= 1; 114 } 115 assert((int)alloc_size_bytes % os::vm_page_size() == 0, "invariant"); 116 return alloc_size_bytes; 117 } 118 119 template <typename T, template <typename> class RetrievalType, typename Callback> 120 T* JfrMemorySpace<T, RetrievalType, Callback>::allocate(size_t size) { 121 const u8 aligned_size_bytes = align_allocation_size(size, _min_elem_size); 122 void* const allocation = JfrCHeapObj::new_array<u1>(aligned_size_bytes + sizeof(T)); 123 if (allocation == NULL) { 124 return NULL; 125 } 126 T* const t = new (allocation) T; 127 assert(t != NULL, "invariant"); 128 if (!t->initialize(sizeof(T), aligned_size_bytes)) { 129 JfrCHeapObj::free(t, aligned_size_bytes + sizeof(T)); 130 return NULL; 131 } 132 return t; 133 } 134 135 template <typename T, template <typename> class RetrievalType, typename Callback> 136 void JfrMemorySpace<T, RetrievalType, Callback>::deallocate(T* t) { 137 assert(t != NULL, "invariant"); 138 assert(!_free.in_list(t), "invariant"); 139 assert(!_full.in_list(t), "invariant"); 140 assert(t != NULL, "invariant"); 141 JfrCHeapObj::free(t, t->total_size()); 142 } 143 144 template <typename Mspace> 145 class MspaceLock { 146 private: 147 Mspace* _mspace; 148 public: 149 MspaceLock(Mspace* mspace) : _mspace(mspace) { _mspace->lock(); } 150 ~MspaceLock() { _mspace->unlock(); } 151 }; 152 153 template <typename Mspace> 154 class ReleaseOp : public StackObj { 155 private: 156 Mspace* _mspace; 157 public: 158 typedef typename Mspace::Type Type; 159 ReleaseOp(Mspace* mspace) : _mspace(mspace) {} 160 bool process(Type* t); 161 size_t processed() const { return 0; } 162 }; 163 164 template <typename Mspace> 165 class MutexedReleaseOp : public ReleaseOp<Mspace> { 166 private: 167 Thread* _thread; 168 public: 169 typedef typename Mspace::Type Type; 170 MutexedReleaseOp(Mspace* mspace, Thread* thread) : ReleaseOp<Mspace>(mspace), _thread(thread) {} 171 bool process(Type* t); 172 size_t processed() const { return ReleaseOp<Mspace>::processed(); } 173 }; 174 175 template <typename Mspace> 176 class ThreadLocalReleaseOp : public StackObj { 177 private: 178 Mspace* _mspace; 179 public: 180 typedef typename Mspace::Type Type; 181 ThreadLocalReleaseOp(Mspace* mspace) : _mspace(mspace) {} 182 bool process(Type* t); 183 size_t processed() const { return 0; } 184 }; 185 186 #endif // SHARE_VM_JFR_RECORDER_STORAGE_JFRMEMORYSPACE_HPP