1 /******************************************************************************/ 2 #ifdef JEMALLOC_H_TYPES 3 4 typedef struct tcache_bin_info_s tcache_bin_info_t; 5 typedef struct tcache_bin_s tcache_bin_t; 6 typedef struct tcache_s tcache_t; 7 8 /* 9 * tcache pointers close to NULL are used to encode state information that is 10 * used for two purposes: preventing thread caching on a per thread basis and 11 * cleaning up during thread shutdown. 12 */ 13 #define TCACHE_STATE_DISABLED ((tcache_t *)(uintptr_t)1) 14 #define TCACHE_STATE_REINCARNATED ((tcache_t *)(uintptr_t)2) 15 #define TCACHE_STATE_PURGATORY ((tcache_t *)(uintptr_t)3) 16 #define TCACHE_STATE_MAX TCACHE_STATE_PURGATORY 17 18 /* 19 * Absolute maximum number of cache slots for each small bin in the thread 20 * cache. This is an additional constraint beyond that imposed as: twice the 21 * number of regions per run for this size class. 22 * 23 * This constant must be an even number. 24 */ 25 #define TCACHE_NSLOTS_SMALL_MAX 200 26 27 /* Number of cache slots for large size classes. */ 28 #define TCACHE_NSLOTS_LARGE 20 29 30 /* (1U << opt_lg_tcache_max) is used to compute tcache_maxclass. */ 31 #define LG_TCACHE_MAXCLASS_DEFAULT 15 32 33 /* 34 * TCACHE_GC_SWEEP is the approximate number of allocation events between 35 * full GC sweeps. Integer rounding may cause the actual number to be 36 * slightly higher, since GC is performed incrementally. 37 */ 38 #define TCACHE_GC_SWEEP 8192 39 40 /* Number of tcache allocation/deallocation events between incremental GCs. */ 41 #define TCACHE_GC_INCR \ 42 ((TCACHE_GC_SWEEP / NBINS) + ((TCACHE_GC_SWEEP / NBINS == 0) ? 0 : 1)) 43 44 #endif /* JEMALLOC_H_TYPES */ 45 /******************************************************************************/ 46 #ifdef JEMALLOC_H_STRUCTS 47 48 typedef enum { 49 tcache_enabled_false = 0, /* Enable cast to/from bool. */ 50 tcache_enabled_true = 1, 51 tcache_enabled_default = 2 52 } tcache_enabled_t; 53 54 /* 55 * Read-only information associated with each element of tcache_t's tbins array 56 * is stored separately, mainly to reduce memory usage. 57 */ 58 struct tcache_bin_info_s { 59 unsigned ncached_max; /* Upper limit on ncached. */ 60 }; 61 62 struct tcache_bin_s { 63 tcache_bin_stats_t tstats; 64 int low_water; /* Min # cached since last GC. */ 65 unsigned lg_fill_div; /* Fill (ncached_max >> lg_fill_div). */ 66 unsigned ncached; /* # of cached objects. */ 67 void **avail; /* Stack of available objects. */ 68 }; 69 70 struct tcache_s { 71 ql_elm(tcache_t) link; /* Used for aggregating stats. */ 72 uint64_t prof_accumbytes;/* Cleared after arena_prof_accum() */ 73 arena_t *arena; /* This thread's arena. */ 74 unsigned ev_cnt; /* Event count since incremental GC. */ 75 unsigned next_gc_bin; /* Next bin to GC. */ 76 tcache_bin_t tbins[1]; /* Dynamically sized. */ 77 /* 78 * The pointer stacks associated with tbins follow as a contiguous 79 * array. During tcache initialization, the avail pointer in each 80 * element of tbins is initialized to point to the proper offset within 81 * this array. 82 */ 83 }; 84 85 #endif /* JEMALLOC_H_STRUCTS */ 86 /******************************************************************************/ 87 #ifdef JEMALLOC_H_EXTERNS 88 89 extern bool opt_tcache; 90 extern ssize_t opt_lg_tcache_max; 91 92 extern tcache_bin_info_t *tcache_bin_info; 93 94 /* 95 * Number of tcache bins. There are NBINS small-object bins, plus 0 or more 96 * large-object bins. 97 */ 98 extern size_t nhbins; 99 100 /* Maximum cached size class. */ 101 extern size_t tcache_maxclass; 102 103 size_t tcache_salloc(const void *ptr); 104 void tcache_event_hard(tcache_t *tcache); 105 void *tcache_alloc_small_hard(tcache_t *tcache, tcache_bin_t *tbin, 106 size_t binind); 107 void tcache_bin_flush_small(tcache_bin_t *tbin, size_t binind, unsigned rem, 108 tcache_t *tcache); 109 void tcache_bin_flush_large(tcache_bin_t *tbin, size_t binind, unsigned rem, 110 tcache_t *tcache); 111 void tcache_arena_associate(tcache_t *tcache, arena_t *arena); 112 void tcache_arena_dissociate(tcache_t *tcache); 113 tcache_t *tcache_get_hard(tcache_t *tcache, bool create); 114 tcache_t *tcache_create(arena_t *arena); 115 void tcache_destroy(tcache_t *tcache); 116 void tcache_thread_cleanup(void *arg); 117 void tcache_stats_merge(tcache_t *tcache, arena_t *arena); 118 bool tcache_boot0(void); 119 bool tcache_boot1(void); 120 121 #endif /* JEMALLOC_H_EXTERNS */ 122 /******************************************************************************/ 123 #ifdef JEMALLOC_H_INLINES 124 125 #ifndef JEMALLOC_ENABLE_INLINE 126 malloc_tsd_protos(JEMALLOC_ATTR(unused), tcache, tcache_t *) 127 malloc_tsd_protos(JEMALLOC_ATTR(unused), tcache_enabled, tcache_enabled_t) 128 129 void tcache_event(tcache_t *tcache); 130 void tcache_flush(void); 131 bool tcache_enabled_get(void); 132 tcache_t *tcache_get(bool create); 133 void tcache_enabled_set(bool enabled); 134 void *tcache_alloc_easy(tcache_bin_t *tbin); 135 void *tcache_alloc_small(tcache_t *tcache, size_t size, bool zero); 136 void *tcache_alloc_large(tcache_t *tcache, size_t size, bool zero); 137 void tcache_dalloc_small(tcache_t *tcache, void *ptr, size_t binind); 138 void tcache_dalloc_large(tcache_t *tcache, void *ptr, size_t size); 139 #endif 140 141 #if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_TCACHE_C_)) 142 /* Map of thread-specific caches. */ 143 malloc_tsd_externs(tcache, tcache_t *) 144 malloc_tsd_funcs(JEMALLOC_ALWAYS_INLINE, tcache, tcache_t *, NULL, 145 tcache_thread_cleanup) 146 /* Per thread flag that allows thread caches to be disabled. */ 147 malloc_tsd_externs(tcache_enabled, tcache_enabled_t) 148 malloc_tsd_funcs(JEMALLOC_ALWAYS_INLINE, tcache_enabled, tcache_enabled_t, 149 tcache_enabled_default, malloc_tsd_no_cleanup) 150 151 JEMALLOC_INLINE void 152 tcache_flush(void) 153 { 154 tcache_t *tcache; 155 156 cassert(config_tcache); 157 158 tcache = *tcache_tsd_get(); 159 if ((uintptr_t)tcache <= (uintptr_t)TCACHE_STATE_MAX) 160 return; 161 tcache_destroy(tcache); 162 tcache = NULL; 163 tcache_tsd_set(&tcache); 164 } 165 166 JEMALLOC_INLINE bool 167 tcache_enabled_get(void) 168 { 169 tcache_enabled_t tcache_enabled; 170 171 cassert(config_tcache); 172 173 tcache_enabled = *tcache_enabled_tsd_get(); 174 if (tcache_enabled == tcache_enabled_default) { 175 tcache_enabled = (tcache_enabled_t)opt_tcache; 176 tcache_enabled_tsd_set(&tcache_enabled); 177 } 178 179 return ((bool)tcache_enabled); 180 } 181 182 JEMALLOC_INLINE void 183 tcache_enabled_set(bool enabled) 184 { 185 tcache_enabled_t tcache_enabled; 186 tcache_t *tcache; 187 188 cassert(config_tcache); 189 190 tcache_enabled = (tcache_enabled_t)enabled; 191 tcache_enabled_tsd_set(&tcache_enabled); 192 tcache = *tcache_tsd_get(); 193 if (enabled) { 194 if (tcache == TCACHE_STATE_DISABLED) { 195 tcache = NULL; 196 tcache_tsd_set(&tcache); 197 } 198 } else /* disabled */ { 199 if (tcache > TCACHE_STATE_MAX) { 200 tcache_destroy(tcache); 201 tcache = NULL; 202 } 203 if (tcache == NULL) { 204 tcache = TCACHE_STATE_DISABLED; 205 tcache_tsd_set(&tcache); 206 } 207 } 208 } 209 210 JEMALLOC_ALWAYS_INLINE tcache_t * 211 tcache_get(bool create) 212 { 213 tcache_t *tcache; 214 215 if (config_tcache == false) 216 return (NULL); 217 if (config_lazy_lock && isthreaded == false) 218 return (NULL); 219 220 tcache = *tcache_tsd_get(); 221 if ((uintptr_t)tcache <= (uintptr_t)TCACHE_STATE_MAX) { 222 if (tcache == TCACHE_STATE_DISABLED) 223 return (NULL); 224 tcache = tcache_get_hard(tcache, create); 225 } 226 227 return (tcache); 228 } 229 230 JEMALLOC_ALWAYS_INLINE void 231 tcache_event(tcache_t *tcache) 232 { 233 234 if (TCACHE_GC_INCR == 0) 235 return; 236 237 tcache->ev_cnt++; 238 assert(tcache->ev_cnt <= TCACHE_GC_INCR); 239 if (tcache->ev_cnt == TCACHE_GC_INCR) 240 tcache_event_hard(tcache); 241 } 242 243 JEMALLOC_ALWAYS_INLINE void * 244 tcache_alloc_easy(tcache_bin_t *tbin) 245 { 246 void *ret; 247 248 if (tbin->ncached == 0) { 249 tbin->low_water = -1; 250 return (NULL); 251 } 252 tbin->ncached--; 253 if ((int)tbin->ncached < tbin->low_water) 254 tbin->low_water = tbin->ncached; 255 ret = tbin->avail[tbin->ncached]; 256 return (ret); 257 } 258 259 JEMALLOC_ALWAYS_INLINE void * 260 tcache_alloc_small(tcache_t *tcache, size_t size, bool zero) 261 { 262 void *ret; 263 size_t binind; 264 tcache_bin_t *tbin; 265 266 binind = small_size2bin(size); 267 assert(binind < NBINS); 268 tbin = &tcache->tbins[binind]; 269 size = small_bin2size(binind); 270 ret = tcache_alloc_easy(tbin); 271 if (ret == NULL) { 272 ret = tcache_alloc_small_hard(tcache, tbin, binind); 273 if (ret == NULL) 274 return (NULL); 275 } 276 assert(tcache_salloc(ret) == size); 277 278 if (zero == false) { 279 if (config_fill) { 280 if (opt_junk) { 281 arena_alloc_junk_small(ret, 282 &arena_bin_info[binind], false); 283 } else if (opt_zero) 284 memset(ret, 0, size); 285 } 286 } else { 287 if (config_fill && opt_junk) { 288 arena_alloc_junk_small(ret, &arena_bin_info[binind], 289 true); 290 } 291 memset(ret, 0, size); 292 } 293 294 if (config_stats) 295 tbin->tstats.nrequests++; 296 if (config_prof) 297 tcache->prof_accumbytes += size; 298 tcache_event(tcache); 299 return (ret); 300 } 301 302 JEMALLOC_ALWAYS_INLINE void * 303 tcache_alloc_large(tcache_t *tcache, size_t size, bool zero) 304 { 305 void *ret; 306 size_t binind; 307 tcache_bin_t *tbin; 308 309 size = PAGE_CEILING(size); 310 assert(size <= tcache_maxclass); 311 binind = NBINS + (size >> LG_PAGE) - 1; 312 assert(binind < nhbins); 313 tbin = &tcache->tbins[binind]; 314 ret = tcache_alloc_easy(tbin); 315 if (ret == NULL) { 316 /* 317 * Only allocate one large object at a time, because it's quite 318 * expensive to create one and not use it. 319 */ 320 ret = arena_malloc_large(tcache->arena, size, zero); 321 if (ret == NULL) 322 return (NULL); 323 } else { 324 if (config_prof && size == PAGE) { 325 arena_chunk_t *chunk = 326 (arena_chunk_t *)CHUNK_ADDR2BASE(ret); 327 size_t pageind = (((uintptr_t)ret - (uintptr_t)chunk) >> 328 LG_PAGE); 329 arena_mapbits_large_binind_set(chunk, pageind, 330 BININD_INVALID); 331 } 332 if (zero == false) { 333 if (config_fill) { 334 if (opt_junk) 335 memset(ret, 0xa5, size); 336 else if (opt_zero) 337 memset(ret, 0, size); 338 } 339 } else 340 memset(ret, 0, size); 341 342 if (config_stats) 343 tbin->tstats.nrequests++; 344 if (config_prof) 345 tcache->prof_accumbytes += size; 346 } 347 348 tcache_event(tcache); 349 return (ret); 350 } 351 352 JEMALLOC_ALWAYS_INLINE void 353 tcache_dalloc_small(tcache_t *tcache, void *ptr, size_t binind) 354 { 355 tcache_bin_t *tbin; 356 tcache_bin_info_t *tbin_info; 357 358 assert(tcache_salloc(ptr) <= SMALL_MAXCLASS); 359 360 if (config_fill && opt_junk) 361 arena_dalloc_junk_small(ptr, &arena_bin_info[binind]); 362 363 tbin = &tcache->tbins[binind]; 364 tbin_info = &tcache_bin_info[binind]; 365 if (tbin->ncached == tbin_info->ncached_max) { 366 tcache_bin_flush_small(tbin, binind, (tbin_info->ncached_max >> 367 1), tcache); 368 } 369 assert(tbin->ncached < tbin_info->ncached_max); 370 tbin->avail[tbin->ncached] = ptr; 371 tbin->ncached++; 372 373 tcache_event(tcache); 374 } 375 376 JEMALLOC_ALWAYS_INLINE void 377 tcache_dalloc_large(tcache_t *tcache, void *ptr, size_t size) 378 { 379 size_t binind; 380 tcache_bin_t *tbin; 381 tcache_bin_info_t *tbin_info; 382 383 assert((size & PAGE_MASK) == 0); 384 assert(tcache_salloc(ptr) > SMALL_MAXCLASS); 385 assert(tcache_salloc(ptr) <= tcache_maxclass); 386 387 binind = NBINS + (size >> LG_PAGE) - 1; 388 389 if (config_fill && opt_junk) 390 memset(ptr, 0x5a, size); 391 392 tbin = &tcache->tbins[binind]; 393 tbin_info = &tcache_bin_info[binind]; 394 if (tbin->ncached == tbin_info->ncached_max) { 395 tcache_bin_flush_large(tbin, binind, (tbin_info->ncached_max >> 396 1), tcache); 397 } 398 assert(tbin->ncached < tbin_info->ncached_max); 399 tbin->avail[tbin->ncached] = ptr; 400 tbin->ncached++; 401 402 tcache_event(tcache); 403 } 404 #endif 405 406 #endif /* JEMALLOC_H_INLINES */ 407 /******************************************************************************/ 408
