Mercurial > hg > graal-compiler
comparison src/share/vm/services/mallocSiteTable.hpp @ 20804:7848fc12602b
Merge with jdk8u40-b25
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Tue, 07 Apr 2015 14:58:49 +0200 |
parents | c6211b707068 |
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20184:84105dcdb05b | 20804:7848fc12602b |
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1 /* | |
2 * Copyright (c) 2014, 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_MALLOC_SITE_TABLE_HPP | |
26 #define SHARE_VM_SERVICES_MALLOC_SITE_TABLE_HPP | |
27 | |
28 #if INCLUDE_NMT | |
29 | |
30 #include "memory/allocation.hpp" | |
31 #include "runtime/atomic.hpp" | |
32 #include "services/allocationSite.hpp" | |
33 #include "services/mallocTracker.hpp" | |
34 #include "services/nmtCommon.hpp" | |
35 #include "utilities/nativeCallStack.hpp" | |
36 | |
37 // MallocSite represents a code path that eventually calls | |
38 // os::malloc() to allocate memory | |
39 class MallocSite : public AllocationSite<MemoryCounter> { | |
40 public: | |
41 MallocSite() : | |
42 AllocationSite<MemoryCounter>(NativeCallStack::EMPTY_STACK) { } | |
43 | |
44 MallocSite(const NativeCallStack& stack) : | |
45 AllocationSite<MemoryCounter>(stack) { } | |
46 | |
47 void allocate(size_t size) { data()->allocate(size); } | |
48 void deallocate(size_t size) { data()->deallocate(size); } | |
49 | |
50 // Memory allocated from this code path | |
51 size_t size() const { return peek()->size(); } | |
52 // The number of calls were made | |
53 size_t count() const { return peek()->count(); } | |
54 }; | |
55 | |
56 // Malloc site hashtable entry | |
57 class MallocSiteHashtableEntry : public CHeapObj<mtNMT> { | |
58 private: | |
59 MallocSite _malloc_site; | |
60 MallocSiteHashtableEntry* _next; | |
61 | |
62 public: | |
63 MallocSiteHashtableEntry() : _next(NULL) { } | |
64 | |
65 MallocSiteHashtableEntry(NativeCallStack stack): | |
66 _malloc_site(stack), _next(NULL) { } | |
67 | |
68 inline const MallocSiteHashtableEntry* next() const { | |
69 return _next; | |
70 } | |
71 | |
72 // Insert an entry atomically. | |
73 // Return true if the entry is inserted successfully. | |
74 // The operation can be failed due to contention from other thread. | |
75 bool atomic_insert(const MallocSiteHashtableEntry* entry) { | |
76 return (Atomic::cmpxchg_ptr((void*)entry, (volatile void*)&_next, | |
77 NULL) == NULL); | |
78 } | |
79 | |
80 void set_callsite(const MallocSite& site) { | |
81 _malloc_site = site; | |
82 } | |
83 | |
84 inline const MallocSite* peek() const { return &_malloc_site; } | |
85 inline MallocSite* data() { return &_malloc_site; } | |
86 | |
87 inline long hash() const { return _malloc_site.hash(); } | |
88 inline bool equals(const NativeCallStack& stack) const { | |
89 return _malloc_site.equals(stack); | |
90 } | |
91 // Allocation/deallocation on this allocation site | |
92 inline void allocate(size_t size) { _malloc_site.allocate(size); } | |
93 inline void deallocate(size_t size) { _malloc_site.deallocate(size); } | |
94 // Memory counters | |
95 inline size_t size() const { return _malloc_site.size(); } | |
96 inline size_t count() const { return _malloc_site.count(); } | |
97 }; | |
98 | |
99 // The walker walks every entry on MallocSiteTable | |
100 class MallocSiteWalker : public StackObj { | |
101 public: | |
102 virtual bool do_malloc_site(const MallocSite* e) { return false; } | |
103 }; | |
104 | |
105 /* | |
106 * Native memory tracking call site table. | |
107 * The table is only needed when detail tracking is enabled. | |
108 */ | |
109 class MallocSiteTable : AllStatic { | |
110 private: | |
111 // The number of hash bucket in this hashtable. The number should | |
112 // be tuned if malloc activities changed significantly. | |
113 // The statistics data can be obtained via Jcmd | |
114 // jcmd <pid> VM.native_memory statistics. | |
115 | |
116 // Currently, (number of buckets / number of entires) ratio is | |
117 // about 1 / 6 | |
118 enum { | |
119 table_base_size = 128, // The base size is calculated from statistics to give | |
120 // table ratio around 1:6 | |
121 table_size = (table_base_size * NMT_TrackingStackDepth - 1) | |
122 }; | |
123 | |
124 | |
125 // This is a very special lock, that allows multiple shared accesses (sharedLock), but | |
126 // once exclusive access (exclusiveLock) is requested, all shared accesses are | |
127 // rejected forever. | |
128 class AccessLock : public StackObj { | |
129 enum LockState { | |
130 NoLock, | |
131 SharedLock, | |
132 ExclusiveLock | |
133 }; | |
134 | |
135 private: | |
136 // A very large negative number. The only possibility to "overflow" | |
137 // this number is when there are more than -min_jint threads in | |
138 // this process, which is not going to happen in foreseeable future. | |
139 const static int _MAGIC_ = min_jint; | |
140 | |
141 LockState _lock_state; | |
142 volatile int* _lock; | |
143 public: | |
144 AccessLock(volatile int* lock) : | |
145 _lock(lock), _lock_state(NoLock) { | |
146 } | |
147 | |
148 ~AccessLock() { | |
149 if (_lock_state == SharedLock) { | |
150 Atomic::dec((volatile jint*)_lock); | |
151 } | |
152 } | |
153 // Acquire shared lock. | |
154 // Return true if shared access is granted. | |
155 inline bool sharedLock() { | |
156 jint res = Atomic::add(1, _lock); | |
157 if (res < 0) { | |
158 Atomic::add(-1, _lock); | |
159 return false; | |
160 } | |
161 _lock_state = SharedLock; | |
162 return true; | |
163 } | |
164 // Acquire exclusive lock | |
165 void exclusiveLock(); | |
166 }; | |
167 | |
168 public: | |
169 static bool initialize(); | |
170 static void shutdown(); | |
171 | |
172 NOT_PRODUCT(static int access_peak_count() { return _peak_count; }) | |
173 | |
174 // Number of hash buckets | |
175 static inline int hash_buckets() { return (int)table_size; } | |
176 | |
177 // Access and copy a call stack from this table. Shared lock should be | |
178 // acquired before access the entry. | |
179 static inline bool access_stack(NativeCallStack& stack, size_t bucket_idx, | |
180 size_t pos_idx) { | |
181 AccessLock locker(&_access_count); | |
182 if (locker.sharedLock()) { | |
183 NOT_PRODUCT(_peak_count = MAX2(_peak_count, _access_count);) | |
184 MallocSite* site = malloc_site(bucket_idx, pos_idx); | |
185 if (site != NULL) { | |
186 stack = *site->call_stack(); | |
187 return true; | |
188 } | |
189 } | |
190 return false; | |
191 } | |
192 | |
193 // Record a new allocation from specified call path. | |
194 // Return true if the allocation is recorded successfully, bucket_idx | |
195 // and pos_idx are also updated to indicate the entry where the allocation | |
196 // information was recorded. | |
197 // Return false only occurs under rare scenarios: | |
198 // 1. out of memory | |
199 // 2. overflow hash bucket | |
200 static inline bool allocation_at(const NativeCallStack& stack, size_t size, | |
201 size_t* bucket_idx, size_t* pos_idx) { | |
202 AccessLock locker(&_access_count); | |
203 if (locker.sharedLock()) { | |
204 NOT_PRODUCT(_peak_count = MAX2(_peak_count, _access_count);) | |
205 MallocSite* site = lookup_or_add(stack, bucket_idx, pos_idx); | |
206 if (site != NULL) site->allocate(size); | |
207 return site != NULL; | |
208 } | |
209 return false; | |
210 } | |
211 | |
212 // Record memory deallocation. bucket_idx and pos_idx indicate where the allocation | |
213 // information was recorded. | |
214 static inline bool deallocation_at(size_t size, size_t bucket_idx, size_t pos_idx) { | |
215 AccessLock locker(&_access_count); | |
216 if (locker.sharedLock()) { | |
217 NOT_PRODUCT(_peak_count = MAX2(_peak_count, _access_count);) | |
218 MallocSite* site = malloc_site(bucket_idx, pos_idx); | |
219 if (site != NULL) { | |
220 site->deallocate(size); | |
221 return true; | |
222 } | |
223 } | |
224 return false; | |
225 } | |
226 | |
227 // Walk this table. | |
228 static bool walk_malloc_site(MallocSiteWalker* walker); | |
229 | |
230 private: | |
231 static MallocSiteHashtableEntry* new_entry(const NativeCallStack& key); | |
232 static void reset(); | |
233 | |
234 // Delete a bucket linked list | |
235 static void delete_linked_list(MallocSiteHashtableEntry* head); | |
236 | |
237 static MallocSite* lookup_or_add(const NativeCallStack& key, size_t* bucket_idx, size_t* pos_idx); | |
238 static MallocSite* malloc_site(size_t bucket_idx, size_t pos_idx); | |
239 static bool walk(MallocSiteWalker* walker); | |
240 | |
241 static inline int hash_to_index(int hash) { | |
242 hash = (hash > 0) ? hash : (-hash); | |
243 return (hash % table_size); | |
244 } | |
245 | |
246 static inline const NativeCallStack* hash_entry_allocation_stack() { | |
247 return (NativeCallStack*)_hash_entry_allocation_stack; | |
248 } | |
249 | |
250 private: | |
251 // Counter for counting concurrent access | |
252 static volatile int _access_count; | |
253 | |
254 // The callsite hashtable. It has to be a static table, | |
255 // since malloc call can come from C runtime linker. | |
256 static MallocSiteHashtableEntry* _table[table_size]; | |
257 | |
258 | |
259 // Reserve enough memory for placing the objects | |
260 | |
261 // The memory for hashtable entry allocation stack object | |
262 static size_t _hash_entry_allocation_stack[CALC_OBJ_SIZE_IN_TYPE(NativeCallStack, size_t)]; | |
263 // The memory for hashtable entry allocation callsite object | |
264 static size_t _hash_entry_allocation_site[CALC_OBJ_SIZE_IN_TYPE(MallocSiteHashtableEntry, size_t)]; | |
265 NOT_PRODUCT(static int _peak_count;) | |
266 }; | |
267 | |
268 #endif // INCLUDE_NMT | |
269 #endif // SHARE_VM_SERVICES_MALLOC_SITE_TABLE_HPP |