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