1 #define JEMALLOC_TCACHE_C_ 2 #include "jemalloc/internal/jemalloc_internal.h" 3 4 /******************************************************************************/ 5 /* Data. */ 6 7 bool opt_tcache = true; 8 ssize_t opt_lg_tcache_max = LG_TCACHE_MAXCLASS_DEFAULT; 9 10 tcache_bin_info_t *tcache_bin_info; 11 static unsigned stack_nelms; /* Total stack elms per tcache. */ 12 13 size_t nhbins; 14 size_t tcache_maxclass; 15 16 tcaches_t *tcaches; 17 18 /* Index of first element within tcaches that has never been used. */ 19 static unsigned tcaches_past; 20 21 /* Head of singly linked list tracking available tcaches elements. */ 22 static tcaches_t *tcaches_avail; 23 24 /******************************************************************************/ 25 26 size_t tcache_salloc(const void *ptr) 27 { 28 29 return (arena_salloc(ptr, false)); 30 } 31 32 void 33 tcache_event_hard(tsd_t *tsd, tcache_t *tcache) 34 { 35 szind_t binind = tcache->next_gc_bin; 36 tcache_bin_t *tbin = &tcache->tbins[binind]; 37 tcache_bin_info_t *tbin_info = &tcache_bin_info[binind]; 38 39 if (tbin->low_water > 0) { 40 /* 41 * Flush (ceiling) 3/4 of the objects below the low water mark. 42 */ 43 if (binind < NBINS) { 44 tcache_bin_flush_small(tsd, tcache, tbin, binind, 45 tbin->ncached - tbin->low_water + (tbin->low_water 46 >> 2)); 47 } else { 48 tcache_bin_flush_large(tsd, tbin, binind, tbin->ncached 49 - tbin->low_water + (tbin->low_water >> 2), tcache); 50 } 51 /* 52 * Reduce fill count by 2X. Limit lg_fill_div such that the 53 * fill count is always at least 1. 54 */ 55 if ((tbin_info->ncached_max >> (tbin->lg_fill_div+1)) >= 1) 56 tbin->lg_fill_div++; 57 } else if (tbin->low_water < 0) { 58 /* 59 * Increase fill count by 2X. Make sure lg_fill_div stays 60 * greater than 0. 61 */ 62 if (tbin->lg_fill_div > 1) 63 tbin->lg_fill_div--; 64 } 65 tbin->low_water = tbin->ncached; 66 67 tcache->next_gc_bin++; 68 if (tcache->next_gc_bin == nhbins) 69 tcache->next_gc_bin = 0; 70 tcache->ev_cnt = 0; 71 } 72 73 void * 74 tcache_alloc_small_hard(tsd_t *tsd, arena_t *arena, tcache_t *tcache, 75 tcache_bin_t *tbin, szind_t binind) 76 { 77 void *ret; 78 79 arena_tcache_fill_small(arena, tbin, binind, config_prof ? 80 tcache->prof_accumbytes : 0); 81 if (config_prof) 82 tcache->prof_accumbytes = 0; 83 ret = tcache_alloc_easy(tbin); 84 85 return (ret); 86 } 87 88 void 89 tcache_bin_flush_small(tsd_t *tsd, tcache_t *tcache, tcache_bin_t *tbin, 90 szind_t binind, unsigned rem) 91 { 92 arena_t *arena; 93 void *ptr; 94 unsigned i, nflush, ndeferred; 95 bool merged_stats = false; 96 97 assert(binind < NBINS); 98 assert(rem <= tbin->ncached); 99 100 arena = arena_choose(tsd, NULL); 101 assert(arena != NULL); 102 for (nflush = tbin->ncached - rem; nflush > 0; nflush = ndeferred) { 103 /* Lock the arena bin associated with the first object. */ 104 arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE( 105 tbin->avail[0]); 106 arena_t *bin_arena = extent_node_arena_get(&chunk->node); 107 arena_bin_t *bin = &bin_arena->bins[binind]; 108 109 if (config_prof && bin_arena == arena) { 110 if (arena_prof_accum(arena, tcache->prof_accumbytes)) 111 prof_idump(); 112 tcache->prof_accumbytes = 0; 113 } 114 115 malloc_mutex_lock(&bin->lock); 116 if (config_stats && bin_arena == arena) { 117 assert(!merged_stats); 118 merged_stats = true; 119 bin->stats.nflushes++; 120 bin->stats.nrequests += tbin->tstats.nrequests; 121 tbin->tstats.nrequests = 0; 122 } 123 ndeferred = 0; 124 for (i = 0; i < nflush; i++) { 125 ptr = tbin->avail[i]; 126 assert(ptr != NULL); 127 chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr); 128 if (extent_node_arena_get(&chunk->node) == bin_arena) { 129 size_t pageind = ((uintptr_t)ptr - 130 (uintptr_t)chunk) >> LG_PAGE; 131 arena_chunk_map_bits_t *bitselm = 132 arena_bitselm_get(chunk, pageind); 133 arena_dalloc_bin_junked_locked(bin_arena, chunk, 134 ptr, bitselm); 135 } else { 136 /* 137 * This object was allocated via a different 138 * arena bin than the one that is currently 139 * locked. Stash the object, so that it can be 140 * handled in a future pass. 141 */ 142 tbin->avail[ndeferred] = ptr; 143 ndeferred++; 144 } 145 } 146 malloc_mutex_unlock(&bin->lock); 147 } 148 if (config_stats && !merged_stats) { 149 /* 150 * The flush loop didn't happen to flush to this thread's 151 * arena, so the stats didn't get merged. Manually do so now. 152 */ 153 arena_bin_t *bin = &arena->bins[binind]; 154 malloc_mutex_lock(&bin->lock); 155 bin->stats.nflushes++; 156 bin->stats.nrequests += tbin->tstats.nrequests; 157 tbin->tstats.nrequests = 0; 158 malloc_mutex_unlock(&bin->lock); 159 } 160 161 memmove(tbin->avail, &tbin->avail[tbin->ncached - rem], 162 rem * sizeof(void *)); 163 tbin->ncached = rem; 164 if ((int)tbin->ncached < tbin->low_water) 165 tbin->low_water = tbin->ncached; 166 } 167 168 void 169 tcache_bin_flush_large(tsd_t *tsd, tcache_bin_t *tbin, szind_t binind, 170 unsigned rem, tcache_t *tcache) 171 { 172 arena_t *arena; 173 void *ptr; 174 unsigned i, nflush, ndeferred; 175 bool merged_stats = false; 176 177 assert(binind < nhbins); 178 assert(rem <= tbin->ncached); 179 180 arena = arena_choose(tsd, NULL); 181 assert(arena != NULL); 182 for (nflush = tbin->ncached - rem; nflush > 0; nflush = ndeferred) { 183 /* Lock the arena associated with the first object. */ 184 arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE( 185 tbin->avail[0]); 186 arena_t *locked_arena = extent_node_arena_get(&chunk->node); 187 UNUSED bool idump; 188 189 if (config_prof) 190 idump = false; 191 malloc_mutex_lock(&locked_arena->lock); 192 if ((config_prof || config_stats) && locked_arena == arena) { 193 if (config_prof) { 194 idump = arena_prof_accum_locked(arena, 195 tcache->prof_accumbytes); 196 tcache->prof_accumbytes = 0; 197 } 198 if (config_stats) { 199 merged_stats = true; 200 arena->stats.nrequests_large += 201 tbin->tstats.nrequests; 202 arena->stats.lstats[binind - NBINS].nrequests += 203 tbin->tstats.nrequests; 204 tbin->tstats.nrequests = 0; 205 } 206 } 207 ndeferred = 0; 208 for (i = 0; i < nflush; i++) { 209 ptr = tbin->avail[i]; 210 assert(ptr != NULL); 211 chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr); 212 if (extent_node_arena_get(&chunk->node) == 213 locked_arena) { 214 arena_dalloc_large_junked_locked(locked_arena, 215 chunk, ptr); 216 } else { 217 /* 218 * This object was allocated via a different 219 * arena than the one that is currently locked. 220 * Stash the object, so that it can be handled 221 * in a future pass. 222 */ 223 tbin->avail[ndeferred] = ptr; 224 ndeferred++; 225 } 226 } 227 malloc_mutex_unlock(&locked_arena->lock); 228 if (config_prof && idump) 229 prof_idump(); 230 } 231 if (config_stats && !merged_stats) { 232 /* 233 * The flush loop didn't happen to flush to this thread's 234 * arena, so the stats didn't get merged. Manually do so now. 235 */ 236 malloc_mutex_lock(&arena->lock); 237 arena->stats.nrequests_large += tbin->tstats.nrequests; 238 arena->stats.lstats[binind - NBINS].nrequests += 239 tbin->tstats.nrequests; 240 tbin->tstats.nrequests = 0; 241 malloc_mutex_unlock(&arena->lock); 242 } 243 244 memmove(tbin->avail, &tbin->avail[tbin->ncached - rem], 245 rem * sizeof(void *)); 246 tbin->ncached = rem; 247 if ((int)tbin->ncached < tbin->low_water) 248 tbin->low_water = tbin->ncached; 249 } 250 251 void 252 tcache_arena_associate(tcache_t *tcache, arena_t *arena) 253 { 254 255 if (config_stats) { 256 /* Link into list of extant tcaches. */ 257 malloc_mutex_lock(&arena->lock); 258 ql_elm_new(tcache, link); 259 ql_tail_insert(&arena->tcache_ql, tcache, link); 260 malloc_mutex_unlock(&arena->lock); 261 } 262 } 263 264 void 265 tcache_arena_reassociate(tcache_t *tcache, arena_t *oldarena, arena_t *newarena) 266 { 267 268 tcache_arena_dissociate(tcache, oldarena); 269 tcache_arena_associate(tcache, newarena); 270 } 271 272 void 273 tcache_arena_dissociate(tcache_t *tcache, arena_t *arena) 274 { 275 276 if (config_stats) { 277 /* Unlink from list of extant tcaches. */ 278 malloc_mutex_lock(&arena->lock); 279 if (config_debug) { 280 bool in_ql = false; 281 tcache_t *iter; 282 ql_foreach(iter, &arena->tcache_ql, link) { 283 if (iter == tcache) { 284 in_ql = true; 285 break; 286 } 287 } 288 assert(in_ql); 289 } 290 ql_remove(&arena->tcache_ql, tcache, link); 291 tcache_stats_merge(tcache, arena); 292 malloc_mutex_unlock(&arena->lock); 293 } 294 } 295 296 tcache_t * 297 tcache_get_hard(tsd_t *tsd) 298 { 299 arena_t *arena; 300 301 if (!tcache_enabled_get()) { 302 if (tsd_nominal(tsd)) 303 tcache_enabled_set(false); /* Memoize. */ 304 return (NULL); 305 } 306 arena = arena_choose(tsd, NULL); 307 if (unlikely(arena == NULL)) 308 return (NULL); 309 return (tcache_create(tsd, arena)); 310 } 311 312 tcache_t * 313 tcache_create(tsd_t *tsd, arena_t *arena) 314 { 315 tcache_t *tcache; 316 size_t size, stack_offset; 317 unsigned i; 318 319 size = offsetof(tcache_t, tbins) + (sizeof(tcache_bin_t) * nhbins); 320 /* Naturally align the pointer stacks. */ 321 size = PTR_CEILING(size); 322 stack_offset = size; 323 size += stack_nelms * sizeof(void *); 324 /* Avoid false cacheline sharing. */ 325 size = sa2u(size, CACHELINE); 326 327 tcache = ipallocztm(tsd, size, CACHELINE, true, false, true, a0get()); 328 if (tcache == NULL) 329 return (NULL); 330 331 tcache_arena_associate(tcache, arena); 332 333 assert((TCACHE_NSLOTS_SMALL_MAX & 1U) == 0); 334 for (i = 0; i < nhbins; i++) { 335 tcache->tbins[i].lg_fill_div = 1; 336 tcache->tbins[i].avail = (void **)((uintptr_t)tcache + 337 (uintptr_t)stack_offset); 338 stack_offset += tcache_bin_info[i].ncached_max * sizeof(void *); 339 } 340 341 return (tcache); 342 } 343 344 static void 345 tcache_destroy(tsd_t *tsd, tcache_t *tcache) 346 { 347 arena_t *arena; 348 unsigned i; 349 350 arena = arena_choose(tsd, NULL); 351 tcache_arena_dissociate(tcache, arena); 352 353 for (i = 0; i < NBINS; i++) { 354 tcache_bin_t *tbin = &tcache->tbins[i]; 355 tcache_bin_flush_small(tsd, tcache, tbin, i, 0); 356 357 if (config_stats && tbin->tstats.nrequests != 0) { 358 arena_bin_t *bin = &arena->bins[i]; 359 malloc_mutex_lock(&bin->lock); 360 bin->stats.nrequests += tbin->tstats.nrequests; 361 malloc_mutex_unlock(&bin->lock); 362 } 363 } 364 365 for (; i < nhbins; i++) { 366 tcache_bin_t *tbin = &tcache->tbins[i]; 367 tcache_bin_flush_large(tsd, tbin, i, 0, tcache); 368 369 if (config_stats && tbin->tstats.nrequests != 0) { 370 malloc_mutex_lock(&arena->lock); 371 arena->stats.nrequests_large += tbin->tstats.nrequests; 372 arena->stats.lstats[i - NBINS].nrequests += 373 tbin->tstats.nrequests; 374 malloc_mutex_unlock(&arena->lock); 375 } 376 } 377 378 if (config_prof && tcache->prof_accumbytes > 0 && 379 arena_prof_accum(arena, tcache->prof_accumbytes)) 380 prof_idump(); 381 382 idalloctm(tsd, tcache, false, true); 383 } 384 385 void 386 tcache_cleanup(tsd_t *tsd) 387 { 388 tcache_t *tcache; 389 390 if (!config_tcache) 391 return; 392 393 if ((tcache = tsd_tcache_get(tsd)) != NULL) { 394 tcache_destroy(tsd, tcache); 395 tsd_tcache_set(tsd, NULL); 396 } 397 } 398 399 void 400 tcache_enabled_cleanup(tsd_t *tsd) 401 { 402 403 /* Do nothing. */ 404 } 405 406 /* Caller must own arena->lock. */ 407 void 408 tcache_stats_merge(tcache_t *tcache, arena_t *arena) 409 { 410 unsigned i; 411 412 cassert(config_stats); 413 414 /* Merge and reset tcache stats. */ 415 for (i = 0; i < NBINS; i++) { 416 arena_bin_t *bin = &arena->bins[i]; 417 tcache_bin_t *tbin = &tcache->tbins[i]; 418 malloc_mutex_lock(&bin->lock); 419 bin->stats.nrequests += tbin->tstats.nrequests; 420 malloc_mutex_unlock(&bin->lock); 421 tbin->tstats.nrequests = 0; 422 } 423 424 for (; i < nhbins; i++) { 425 malloc_large_stats_t *lstats = &arena->stats.lstats[i - NBINS]; 426 tcache_bin_t *tbin = &tcache->tbins[i]; 427 arena->stats.nrequests_large += tbin->tstats.nrequests; 428 lstats->nrequests += tbin->tstats.nrequests; 429 tbin->tstats.nrequests = 0; 430 } 431 } 432 433 bool 434 tcaches_create(tsd_t *tsd, unsigned *r_ind) 435 { 436 tcache_t *tcache; 437 tcaches_t *elm; 438 439 if (tcaches == NULL) { 440 tcaches = base_alloc(sizeof(tcache_t *) * 441 (MALLOCX_TCACHE_MAX+1)); 442 if (tcaches == NULL) 443 return (true); 444 } 445 446 if (tcaches_avail == NULL && tcaches_past > MALLOCX_TCACHE_MAX) 447 return (true); 448 tcache = tcache_create(tsd, a0get()); 449 if (tcache == NULL) 450 return (true); 451 452 if (tcaches_avail != NULL) { 453 elm = tcaches_avail; 454 tcaches_avail = tcaches_avail->next; 455 elm->tcache = tcache; 456 *r_ind = elm - tcaches; 457 } else { 458 elm = &tcaches[tcaches_past]; 459 elm->tcache = tcache; 460 *r_ind = tcaches_past; 461 tcaches_past++; 462 } 463 464 return (false); 465 } 466 467 static void 468 tcaches_elm_flush(tsd_t *tsd, tcaches_t *elm) 469 { 470 471 if (elm->tcache == NULL) 472 return; 473 tcache_destroy(tsd, elm->tcache); 474 elm->tcache = NULL; 475 } 476 477 void 478 tcaches_flush(tsd_t *tsd, unsigned ind) 479 { 480 481 tcaches_elm_flush(tsd, &tcaches[ind]); 482 } 483 484 void 485 tcaches_destroy(tsd_t *tsd, unsigned ind) 486 { 487 tcaches_t *elm = &tcaches[ind]; 488 tcaches_elm_flush(tsd, elm); 489 elm->next = tcaches_avail; 490 tcaches_avail = elm; 491 } 492 493 bool 494 tcache_boot(void) 495 { 496 unsigned i; 497 498 /* 499 * If necessary, clamp opt_lg_tcache_max, now that large_maxclass is 500 * known. 501 */ 502 if (opt_lg_tcache_max < 0 || (1U << opt_lg_tcache_max) < SMALL_MAXCLASS) 503 tcache_maxclass = SMALL_MAXCLASS; 504 else if ((1U << opt_lg_tcache_max) > large_maxclass) 505 tcache_maxclass = large_maxclass; 506 else 507 tcache_maxclass = (1U << opt_lg_tcache_max); 508 509 nhbins = size2index(tcache_maxclass) + 1; 510 511 /* Initialize tcache_bin_info. */ 512 tcache_bin_info = (tcache_bin_info_t *)base_alloc(nhbins * 513 sizeof(tcache_bin_info_t)); 514 if (tcache_bin_info == NULL) 515 return (true); 516 stack_nelms = 0; 517 for (i = 0; i < NBINS; i++) { 518 if ((arena_bin_info[i].nregs << 1) <= TCACHE_NSLOTS_SMALL_MIN) { 519 tcache_bin_info[i].ncached_max = 520 TCACHE_NSLOTS_SMALL_MIN; 521 } else if ((arena_bin_info[i].nregs << 1) <= 522 TCACHE_NSLOTS_SMALL_MAX) { 523 tcache_bin_info[i].ncached_max = 524 (arena_bin_info[i].nregs << 1); 525 } else { 526 tcache_bin_info[i].ncached_max = 527 TCACHE_NSLOTS_SMALL_MAX; 528 } 529 stack_nelms += tcache_bin_info[i].ncached_max; 530 } 531 for (; i < nhbins; i++) { 532 tcache_bin_info[i].ncached_max = TCACHE_NSLOTS_LARGE; 533 stack_nelms += tcache_bin_info[i].ncached_max; 534 } 535 536 return (false); 537 } 538