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_TRACKER_HPP 26 #define SHARE_VM_SERVICES_MALLOC_TRACKER_HPP 27 28 #if INCLUDE_NMT 29 30 #include "memory/allocation.hpp" 31 #include "runtime/atomic.hpp" 32 #include "services/nmtCommon.hpp" 33 #include "utilities/nativeCallStack.hpp" 34 35 /* 36 * This counter class counts memory allocation and deallocation, 37 * records total memory allocation size and number of allocations. 38 * The counters are updated atomically. 39 */ 40 class MemoryCounter VALUE_OBJ_CLASS_SPEC { 41 private: 42 size_t _count; 43 size_t _size; 44 45 DEBUG_ONLY(size_t _peak_count;) 46 DEBUG_ONLY(size_t _peak_size; ) 47 48 public: 49 MemoryCounter() : _count(0), _size(0) { 50 DEBUG_ONLY(_peak_count = 0;) 51 DEBUG_ONLY(_peak_size = 0;) 52 } 53 54 inline void allocate(size_t sz) { 55 Atomic::add(1, (volatile MemoryCounterType*)&_count); 56 if (sz > 0) { 57 Atomic::add((MemoryCounterType)sz, (volatile MemoryCounterType*)&_size); 58 DEBUG_ONLY(_peak_size = MAX2(_peak_size, _size)); 59 } 60 DEBUG_ONLY(_peak_count = MAX2(_peak_count, _count);) 61 } 62 63 inline void deallocate(size_t sz) { 64 assert(_count > 0, "Negative counter"); 65 assert(_size >= sz, "Negative size"); 66 Atomic::add(-1, (volatile MemoryCounterType*)&_count); 67 if (sz > 0) { 68 Atomic::add(-(MemoryCounterType)sz, (volatile MemoryCounterType*)&_size); 69 } 70 } 71 72 inline void resize(long sz) { 73 if (sz != 0) { 74 Atomic::add((MemoryCounterType)sz, (volatile MemoryCounterType*)&_size); 75 DEBUG_ONLY(_peak_size = MAX2(_size, _peak_size);) 76 } 77 } 78 79 inline size_t count() const { return _count; } 80 inline size_t size() const { return _size; } 81 DEBUG_ONLY(inline size_t peak_count() const { return _peak_count; }) 82 DEBUG_ONLY(inline size_t peak_size() const { return _peak_size; }) 83 84 }; 85 86 /* 87 * Malloc memory used by a particular subsystem. 88 * It includes the memory acquired through os::malloc() 89 * call and arena's backing memory. 90 */ 91 class MallocMemory VALUE_OBJ_CLASS_SPEC { 92 private: 93 MemoryCounter _malloc; 94 MemoryCounter _arena; 95 96 public: 97 MallocMemory() { } 98 99 inline void record_malloc(size_t sz) { 100 _malloc.allocate(sz); 101 } 102 103 inline void record_free(size_t sz) { 104 _malloc.deallocate(sz); 105 } 106 107 inline void record_new_arena() { 108 _arena.allocate(0); 109 } 110 111 inline void record_arena_free() { 112 _arena.deallocate(0); 113 } 114 115 inline void record_arena_size_change(long sz) { 116 _arena.resize(sz); 117 } 118 119 inline size_t malloc_size() const { return _malloc.size(); } 120 inline size_t malloc_count() const { return _malloc.count();} 121 inline size_t arena_size() const { return _arena.size(); } 122 inline size_t arena_count() const { return _arena.count(); } 123 124 DEBUG_ONLY(inline const MemoryCounter& malloc_counter() const { return _malloc; }) 125 DEBUG_ONLY(inline const MemoryCounter& arena_counter() const { return _arena; }) 126 }; 127 128 class MallocMemorySummary; 129 130 // A snapshot of malloc'd memory, includes malloc memory 131 // usage by types and memory used by tracking itself. 132 class MallocMemorySnapshot : public ResourceObj { 133 friend class MallocMemorySummary; 134 135 private: 136 MallocMemory _malloc[mt_number_of_types]; 137 MemoryCounter _tracking_header; 138 139 140 public: 141 inline MallocMemory* by_type(MEMFLAGS flags) { 142 int index = NMTUtil::flag_to_index(flags); 143 return &_malloc[index]; 144 } 145 146 inline MallocMemory* by_index(int index) { 147 assert(index >= 0, "Index out of bound"); 148 assert(index < mt_number_of_types, "Index out of bound"); 149 return &_malloc[index]; 150 } 151 152 inline MemoryCounter* malloc_overhead() { 153 return &_tracking_header; 154 } 155 156 // Total malloc'd memory amount 157 size_t total() const; 158 // Total malloc'd memory used by arenas 159 size_t total_arena() const; 160 161 inline size_t thread_count() const { 162 MallocMemorySnapshot* s = const_cast<MallocMemorySnapshot*>(this); 163 return s->by_type(mtThreadStack)->malloc_count(); 164 } 165 166 void copy_to(MallocMemorySnapshot* s) { 167 s->_tracking_header = _tracking_header; 168 for (int index = 0; index < mt_number_of_types; index ++) { 169 s->_malloc[index] = _malloc[index]; 170 } 171 } 172 173 // Make adjustment by subtracting chunks used by arenas 174 // from total chunks to get total free chunk size 175 void make_adjustment(); 176 }; 177 178 /* 179 * This class is for collecting malloc statistics at summary level 180 */ 181 class MallocMemorySummary : AllStatic { 182 private: 183 // Reserve memory for placement of MallocMemorySnapshot object 184 static size_t _snapshot[CALC_OBJ_SIZE_IN_TYPE(MallocMemorySnapshot, size_t)]; 185 186 public: 187 static void initialize(); 188 189 static inline void record_malloc(size_t size, MEMFLAGS flag) { 190 as_snapshot()->by_type(flag)->record_malloc(size); 191 } 192 193 static inline void record_free(size_t size, MEMFLAGS flag) { 194 as_snapshot()->by_type(flag)->record_free(size); 195 } 196 197 static inline void record_new_arena(MEMFLAGS flag) { 198 as_snapshot()->by_type(flag)->record_new_arena(); 199 } 200 201 static inline void record_arena_free(MEMFLAGS flag) { 202 as_snapshot()->by_type(flag)->record_arena_free(); 203 } 204 205 static inline void record_arena_size_change(long size, MEMFLAGS flag) { 206 as_snapshot()->by_type(flag)->record_arena_size_change(size); 207 } 208 209 static void snapshot(MallocMemorySnapshot* s) { 210 as_snapshot()->copy_to(s); 211 s->make_adjustment(); 212 } 213 214 // Record memory used by malloc tracking header 215 static inline void record_new_malloc_header(size_t sz) { 216 as_snapshot()->malloc_overhead()->allocate(sz); 217 } 218 219 static inline void record_free_malloc_header(size_t sz) { 220 as_snapshot()->malloc_overhead()->deallocate(sz); 221 } 222 223 // The memory used by malloc tracking headers 224 static inline size_t tracking_overhead() { 225 return as_snapshot()->malloc_overhead()->size(); 226 } 227 228 static MallocMemorySnapshot* as_snapshot() { 229 return (MallocMemorySnapshot*)_snapshot; 230 } 231 }; 232 233 234 /* 235 * Malloc tracking header. 236 * To satisfy malloc alignment requirement, NMT uses 2 machine words for tracking purpose, 237 * which ensures 8-bytes alignment on 32-bit systems and 16-bytes on 64-bit systems (Product build). 238 */ 239 240 class MallocHeader VALUE_OBJ_CLASS_SPEC { 241 #ifdef _LP64 242 size_t _size : 64; 243 size_t _flags : 8; 244 size_t _pos_idx : 16; 245 size_t _bucket_idx: 40; 246 #define MAX_MALLOCSITE_TABLE_SIZE right_n_bits(40) 247 #define MAX_BUCKET_LENGTH right_n_bits(16) 248 #else 249 size_t _size : 32; 250 size_t _flags : 8; 251 size_t _pos_idx : 8; 252 size_t _bucket_idx: 16; 253 #define MAX_MALLOCSITE_TABLE_SIZE right_n_bits(16) 254 #define MAX_BUCKET_LENGTH right_n_bits(8) 255 #endif // _LP64 256 257 public: 258 MallocHeader(size_t size, MEMFLAGS flags, const NativeCallStack& stack, NMT_TrackingLevel level) { 259 assert(sizeof(MallocHeader) == sizeof(void*) * 2, 260 "Wrong header size"); 261 262 if (level == NMT_minimal) { 263 return; 264 } 265 266 _flags = flags; 267 set_size(size); 268 if (level == NMT_detail) { 269 size_t bucket_idx; 270 size_t pos_idx; 271 if (record_malloc_site(stack, size, &bucket_idx, &pos_idx)) { 272 assert(bucket_idx <= MAX_MALLOCSITE_TABLE_SIZE, "Overflow bucket index"); 273 assert(pos_idx <= MAX_BUCKET_LENGTH, "Overflow bucket position index"); 274 _bucket_idx = bucket_idx; 275 _pos_idx = pos_idx; 276 } 277 } 278 279 MallocMemorySummary::record_malloc(size, flags); 280 MallocMemorySummary::record_new_malloc_header(sizeof(MallocHeader)); 281 } 282 283 inline size_t size() const { return _size; } 284 inline MEMFLAGS flags() const { return (MEMFLAGS)_flags; } 285 bool get_stack(NativeCallStack& stack) const; 286 287 // Cleanup tracking information before the memory is released. 288 void release() const; 289 290 private: 291 inline void set_size(size_t size) { 292 _size = size; 293 } 294 bool record_malloc_site(const NativeCallStack& stack, size_t size, 295 size_t* bucket_idx, size_t* pos_idx) const; 296 }; 297 298 299 // Main class called from MemTracker to track malloc activities 300 class MallocTracker : AllStatic { 301 public: 302 // Initialize malloc tracker for specific tracking level 303 static bool initialize(NMT_TrackingLevel level); 304 305 static bool transition(NMT_TrackingLevel from, NMT_TrackingLevel to); 306 307 // malloc tracking header size for specific tracking level 308 static inline size_t malloc_header_size(NMT_TrackingLevel level) { 309 return (level == NMT_off) ? 0 : sizeof(MallocHeader); 310 } 311 312 // Parameter name convention: 313 // memblock : the beginning address for user data 314 // malloc_base: the beginning address that includes malloc tracking header 315 // 316 // The relationship: 317 // memblock = (char*)malloc_base + sizeof(nmt header) 318 // 319 320 // Record malloc on specified memory block 321 static void* record_malloc(void* malloc_base, size_t size, MEMFLAGS flags, 322 const NativeCallStack& stack, NMT_TrackingLevel level); 323 324 // Record free on specified memory block 325 static void* record_free(void* memblock); 326 327 // Offset memory address to header address 328 static inline void* get_base(void* memblock); 329 static inline void* get_base(void* memblock, NMT_TrackingLevel level) { 330 if (memblock == NULL || level == NMT_off) return memblock; 331 return (char*)memblock - malloc_header_size(level); 332 } 333 334 // Get memory size 335 static inline size_t get_size(void* memblock) { 336 MallocHeader* header = malloc_header(memblock); 337 return header->size(); 338 } 339 340 // Get memory type 341 static inline MEMFLAGS get_flags(void* memblock) { 342 MallocHeader* header = malloc_header(memblock); 343 return header->flags(); 344 } 345 346 // Get header size 347 static inline size_t get_header_size(void* memblock) { 348 return (memblock == NULL) ? 0 : sizeof(MallocHeader); 349 } 350 351 static inline void record_new_arena(MEMFLAGS flags) { 352 MallocMemorySummary::record_new_arena(flags); 353 } 354 355 static inline void record_arena_free(MEMFLAGS flags) { 356 MallocMemorySummary::record_arena_free(flags); 357 } 358 359 static inline void record_arena_size_change(int size, MEMFLAGS flags) { 360 MallocMemorySummary::record_arena_size_change(size, flags); 361 } 362 private: 363 static inline MallocHeader* malloc_header(void *memblock) { 364 assert(memblock != NULL, "NULL pointer"); 365 MallocHeader* header = (MallocHeader*)((char*)memblock - sizeof(MallocHeader)); 366 return header; 367 } 368 }; 369 370 #endif // INCLUDE_NMT 371 372 373 #endif //SHARE_VM_SERVICES_MALLOC_TRACKER_HPP