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 unsigned 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 /* Protects tcaches{,_past,_avail}. */
25 static malloc_mutex_t tcaches_mtx;
26
27 /******************************************************************************/
28
29 size_t
tcache_salloc(tsdn_t * tsdn,const void * ptr)30 tcache_salloc(tsdn_t *tsdn, const void *ptr)
31 {
32
33 return (arena_salloc(tsdn, ptr, false));
34 }
35
36 void
tcache_event_hard(tsd_t * tsd,tcache_t * tcache)37 tcache_event_hard(tsd_t *tsd, tcache_t *tcache)
38 {
39 szind_t binind = tcache->next_gc_bin;
40 tcache_bin_t *tbin = &tcache->tbins[binind];
41 tcache_bin_info_t *tbin_info = &tcache_bin_info[binind];
42
43 if (tbin->low_water > 0) {
44 /*
45 * Flush (ceiling) 3/4 of the objects below the low water mark.
46 */
47 if (binind < NBINS) {
48 tcache_bin_flush_small(tsd, tcache, tbin, binind,
49 tbin->ncached - tbin->low_water + (tbin->low_water
50 >> 2));
51 } else {
52 tcache_bin_flush_large(tsd, tbin, binind, tbin->ncached
53 - tbin->low_water + (tbin->low_water >> 2), tcache);
54 }
55 /*
56 * Reduce fill count by 2X. Limit lg_fill_div such that the
57 * fill count is always at least 1.
58 */
59 if ((tbin_info->ncached_max >> (tbin->lg_fill_div+1)) >= 1)
60 tbin->lg_fill_div++;
61 } else if (tbin->low_water < 0) {
62 /*
63 * Increase fill count by 2X. Make sure lg_fill_div stays
64 * greater than 0.
65 */
66 if (tbin->lg_fill_div > 1)
67 tbin->lg_fill_div--;
68 }
69 tbin->low_water = tbin->ncached;
70
71 tcache->next_gc_bin++;
72 if (tcache->next_gc_bin == nhbins)
73 tcache->next_gc_bin = 0;
74 }
75
76 void *
tcache_alloc_small_hard(tsdn_t * tsdn,arena_t * arena,tcache_t * tcache,tcache_bin_t * tbin,szind_t binind,bool * tcache_success)77 tcache_alloc_small_hard(tsdn_t *tsdn, arena_t *arena, tcache_t *tcache,
78 tcache_bin_t *tbin, szind_t binind, bool *tcache_success)
79 {
80 void *ret;
81
82 arena_tcache_fill_small(tsdn, arena, tbin, binind, config_prof ?
83 tcache->prof_accumbytes : 0);
84 if (config_prof)
85 tcache->prof_accumbytes = 0;
86 ret = tcache_alloc_easy(tbin, tcache_success);
87
88 return (ret);
89 }
90
91 void
tcache_bin_flush_small(tsd_t * tsd,tcache_t * tcache,tcache_bin_t * tbin,szind_t binind,unsigned rem)92 tcache_bin_flush_small(tsd_t *tsd, tcache_t *tcache, tcache_bin_t *tbin,
93 szind_t binind, unsigned rem)
94 {
95 arena_t *arena;
96 void *ptr;
97 unsigned i, nflush, ndeferred;
98 bool merged_stats = false;
99
100 assert(binind < NBINS);
101 assert(rem <= tbin->ncached);
102
103 arena = arena_choose(tsd, NULL);
104 assert(arena != NULL);
105 for (nflush = tbin->ncached - rem; nflush > 0; nflush = ndeferred) {
106 /* Lock the arena bin associated with the first object. */
107 arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(
108 *(tbin->avail - 1));
109 arena_t *bin_arena = extent_node_arena_get(&chunk->node);
110 arena_bin_t *bin = &bin_arena->bins[binind];
111
112 if (config_prof && bin_arena == arena) {
113 if (arena_prof_accum(tsd_tsdn(tsd), arena,
114 tcache->prof_accumbytes))
115 prof_idump(tsd_tsdn(tsd));
116 tcache->prof_accumbytes = 0;
117 }
118
119 malloc_mutex_lock(tsd_tsdn(tsd), &bin->lock);
120 if (config_stats && bin_arena == arena) {
121 assert(!merged_stats);
122 merged_stats = true;
123 bin->stats.nflushes++;
124 bin->stats.nrequests += tbin->tstats.nrequests;
125 tbin->tstats.nrequests = 0;
126 }
127 ndeferred = 0;
128 for (i = 0; i < nflush; i++) {
129 ptr = *(tbin->avail - 1 - i);
130 assert(ptr != NULL);
131 chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
132 if (extent_node_arena_get(&chunk->node) == bin_arena) {
133 size_t pageind = ((uintptr_t)ptr -
134 (uintptr_t)chunk) >> LG_PAGE;
135 arena_chunk_map_bits_t *bitselm =
136 arena_bitselm_get_mutable(chunk, pageind);
137 arena_dalloc_bin_junked_locked(tsd_tsdn(tsd),
138 bin_arena, chunk, ptr, bitselm);
139 } else {
140 /*
141 * This object was allocated via a different
142 * arena bin than the one that is currently
143 * locked. Stash the object, so that it can be
144 * handled in a future pass.
145 */
146 *(tbin->avail - 1 - ndeferred) = ptr;
147 ndeferred++;
148 }
149 }
150 malloc_mutex_unlock(tsd_tsdn(tsd), &bin->lock);
151 arena_decay_ticks(tsd_tsdn(tsd), bin_arena, nflush - ndeferred);
152 }
153 if (config_stats && !merged_stats) {
154 /*
155 * The flush loop didn't happen to flush to this thread's
156 * arena, so the stats didn't get merged. Manually do so now.
157 */
158 arena_bin_t *bin = &arena->bins[binind];
159 malloc_mutex_lock(tsd_tsdn(tsd), &bin->lock);
160 bin->stats.nflushes++;
161 bin->stats.nrequests += tbin->tstats.nrequests;
162 tbin->tstats.nrequests = 0;
163 malloc_mutex_unlock(tsd_tsdn(tsd), &bin->lock);
164 }
165
166 memmove(tbin->avail - rem, tbin->avail - tbin->ncached, rem *
167 sizeof(void *));
168 tbin->ncached = rem;
169 if ((int)tbin->ncached < tbin->low_water)
170 tbin->low_water = tbin->ncached;
171 }
172
173 void
tcache_bin_flush_large(tsd_t * tsd,tcache_bin_t * tbin,szind_t binind,unsigned rem,tcache_t * tcache)174 tcache_bin_flush_large(tsd_t *tsd, tcache_bin_t *tbin, szind_t binind,
175 unsigned rem, tcache_t *tcache)
176 {
177 arena_t *arena;
178 void *ptr;
179 unsigned i, nflush, ndeferred;
180 bool merged_stats = false;
181
182 assert(binind < nhbins);
183 assert(rem <= tbin->ncached);
184
185 arena = arena_choose(tsd, NULL);
186 assert(arena != NULL);
187 for (nflush = tbin->ncached - rem; nflush > 0; nflush = ndeferred) {
188 /* Lock the arena associated with the first object. */
189 arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(
190 *(tbin->avail - 1));
191 arena_t *locked_arena = extent_node_arena_get(&chunk->node);
192 UNUSED bool idump;
193
194 if (config_prof)
195 idump = false;
196 malloc_mutex_lock(tsd_tsdn(tsd), &locked_arena->lock);
197 if ((config_prof || config_stats) && locked_arena == arena) {
198 if (config_prof) {
199 idump = arena_prof_accum_locked(arena,
200 tcache->prof_accumbytes);
201 tcache->prof_accumbytes = 0;
202 }
203 if (config_stats) {
204 merged_stats = true;
205 arena->stats.nrequests_large +=
206 tbin->tstats.nrequests;
207 arena->stats.lstats[binind - NBINS].nrequests +=
208 tbin->tstats.nrequests;
209 tbin->tstats.nrequests = 0;
210 }
211 }
212 ndeferred = 0;
213 for (i = 0; i < nflush; i++) {
214 ptr = *(tbin->avail - 1 - i);
215 assert(ptr != NULL);
216 chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
217 if (extent_node_arena_get(&chunk->node) ==
218 locked_arena) {
219 arena_dalloc_large_junked_locked(tsd_tsdn(tsd),
220 locked_arena, chunk, ptr);
221 } else {
222 /*
223 * This object was allocated via a different
224 * arena than the one that is currently locked.
225 * Stash the object, so that it can be handled
226 * in a future pass.
227 */
228 *(tbin->avail - 1 - ndeferred) = ptr;
229 ndeferred++;
230 }
231 }
232 malloc_mutex_unlock(tsd_tsdn(tsd), &locked_arena->lock);
233 if (config_prof && idump)
234 prof_idump(tsd_tsdn(tsd));
235 arena_decay_ticks(tsd_tsdn(tsd), locked_arena, nflush -
236 ndeferred);
237 }
238 if (config_stats && !merged_stats) {
239 /*
240 * The flush loop didn't happen to flush to this thread's
241 * arena, so the stats didn't get merged. Manually do so now.
242 */
243 malloc_mutex_lock(tsd_tsdn(tsd), &arena->lock);
244 arena->stats.nrequests_large += tbin->tstats.nrequests;
245 arena->stats.lstats[binind - NBINS].nrequests +=
246 tbin->tstats.nrequests;
247 tbin->tstats.nrequests = 0;
248 malloc_mutex_unlock(tsd_tsdn(tsd), &arena->lock);
249 }
250
251 memmove(tbin->avail - rem, tbin->avail - tbin->ncached, rem *
252 sizeof(void *));
253 tbin->ncached = rem;
254 if ((int)tbin->ncached < tbin->low_water)
255 tbin->low_water = tbin->ncached;
256 }
257
258 static void
tcache_arena_associate(tsdn_t * tsdn,tcache_t * tcache,arena_t * arena)259 tcache_arena_associate(tsdn_t *tsdn, tcache_t *tcache, arena_t *arena)
260 {
261
262 if (config_stats) {
263 /* Link into list of extant tcaches. */
264 malloc_mutex_lock(tsdn, &arena->lock);
265 ql_elm_new(tcache, link);
266 ql_tail_insert(&arena->tcache_ql, tcache, link);
267 malloc_mutex_unlock(tsdn, &arena->lock);
268 }
269 }
270
271 static void
tcache_arena_dissociate(tsdn_t * tsdn,tcache_t * tcache,arena_t * arena)272 tcache_arena_dissociate(tsdn_t *tsdn, tcache_t *tcache, arena_t *arena)
273 {
274
275 if (config_stats) {
276 /* Unlink from list of extant tcaches. */
277 malloc_mutex_lock(tsdn, &arena->lock);
278 if (config_debug) {
279 bool in_ql = false;
280 tcache_t *iter;
281 ql_foreach(iter, &arena->tcache_ql, link) {
282 if (iter == tcache) {
283 in_ql = true;
284 break;
285 }
286 }
287 assert(in_ql);
288 }
289 ql_remove(&arena->tcache_ql, tcache, link);
290 tcache_stats_merge(tsdn, tcache, arena);
291 malloc_mutex_unlock(tsdn, &arena->lock);
292 }
293 }
294
295 void
tcache_arena_reassociate(tsdn_t * tsdn,tcache_t * tcache,arena_t * oldarena,arena_t * newarena)296 tcache_arena_reassociate(tsdn_t *tsdn, tcache_t *tcache, arena_t *oldarena,
297 arena_t *newarena)
298 {
299
300 tcache_arena_dissociate(tsdn, tcache, oldarena);
301 tcache_arena_associate(tsdn, tcache, newarena);
302 }
303
304 tcache_t *
tcache_get_hard(tsd_t * tsd)305 tcache_get_hard(tsd_t *tsd)
306 {
307 arena_t *arena;
308
309 if (!tcache_enabled_get()) {
310 if (tsd_nominal(tsd))
311 tcache_enabled_set(false); /* Memoize. */
312 return (NULL);
313 }
314 arena = arena_choose(tsd, NULL);
315 if (unlikely(arena == NULL))
316 return (NULL);
317 return (tcache_create(tsd_tsdn(tsd), arena));
318 }
319
320 tcache_t *
tcache_create(tsdn_t * tsdn,arena_t * arena)321 tcache_create(tsdn_t *tsdn, arena_t *arena)
322 {
323 tcache_t *tcache;
324 size_t size, stack_offset;
325 unsigned i;
326
327 size = offsetof(tcache_t, tbins) + (sizeof(tcache_bin_t) * nhbins);
328 /* Naturally align the pointer stacks. */
329 size = PTR_CEILING(size);
330 stack_offset = size;
331 size += stack_nelms * sizeof(void *);
332 /* Avoid false cacheline sharing. */
333 size = sa2u(size, CACHELINE);
334
335 tcache = ipallocztm(tsdn, size, CACHELINE, true, NULL, true,
336 arena_get(TSDN_NULL, 0, true));
337 if (tcache == NULL)
338 return (NULL);
339
340 tcache_arena_associate(tsdn, tcache, arena);
341
342 ticker_init(&tcache->gc_ticker, TCACHE_GC_INCR);
343
344 assert((TCACHE_NSLOTS_SMALL_MAX & 1U) == 0);
345 for (i = 0; i < nhbins; i++) {
346 tcache->tbins[i].lg_fill_div = 1;
347 stack_offset += tcache_bin_info[i].ncached_max * sizeof(void *);
348 /*
349 * avail points past the available space. Allocations will
350 * access the slots toward higher addresses (for the benefit of
351 * prefetch).
352 */
353 tcache->tbins[i].avail = (void **)((uintptr_t)tcache +
354 (uintptr_t)stack_offset);
355 }
356
357 return (tcache);
358 }
359
360 static void
tcache_destroy(tsd_t * tsd,tcache_t * tcache)361 tcache_destroy(tsd_t *tsd, tcache_t *tcache)
362 {
363 arena_t *arena;
364 unsigned i;
365
366 arena = arena_choose(tsd, NULL);
367 tcache_arena_dissociate(tsd_tsdn(tsd), tcache, arena);
368
369 for (i = 0; i < NBINS; i++) {
370 tcache_bin_t *tbin = &tcache->tbins[i];
371 tcache_bin_flush_small(tsd, tcache, tbin, i, 0);
372
373 if (config_stats && tbin->tstats.nrequests != 0) {
374 arena_bin_t *bin = &arena->bins[i];
375 malloc_mutex_lock(tsd_tsdn(tsd), &bin->lock);
376 bin->stats.nrequests += tbin->tstats.nrequests;
377 malloc_mutex_unlock(tsd_tsdn(tsd), &bin->lock);
378 }
379 }
380
381 for (; i < nhbins; i++) {
382 tcache_bin_t *tbin = &tcache->tbins[i];
383 tcache_bin_flush_large(tsd, tbin, i, 0, tcache);
384
385 if (config_stats && tbin->tstats.nrequests != 0) {
386 malloc_mutex_lock(tsd_tsdn(tsd), &arena->lock);
387 arena->stats.nrequests_large += tbin->tstats.nrequests;
388 arena->stats.lstats[i - NBINS].nrequests +=
389 tbin->tstats.nrequests;
390 malloc_mutex_unlock(tsd_tsdn(tsd), &arena->lock);
391 }
392 }
393
394 if (config_prof && tcache->prof_accumbytes > 0 &&
395 arena_prof_accum(tsd_tsdn(tsd), arena, tcache->prof_accumbytes))
396 prof_idump(tsd_tsdn(tsd));
397
398 idalloctm(tsd_tsdn(tsd), tcache, NULL, true, true);
399 }
400
401 void
tcache_cleanup(tsd_t * tsd)402 tcache_cleanup(tsd_t *tsd)
403 {
404 tcache_t *tcache;
405
406 if (!config_tcache)
407 return;
408
409 if ((tcache = tsd_tcache_get(tsd)) != NULL) {
410 tcache_destroy(tsd, tcache);
411 tsd_tcache_set(tsd, NULL);
412 }
413 }
414
415 void
tcache_enabled_cleanup(tsd_t * tsd)416 tcache_enabled_cleanup(tsd_t *tsd)
417 {
418
419 /* Do nothing. */
420 }
421
422 void
tcache_stats_merge(tsdn_t * tsdn,tcache_t * tcache,arena_t * arena)423 tcache_stats_merge(tsdn_t *tsdn, tcache_t *tcache, arena_t *arena)
424 {
425 unsigned i;
426
427 cassert(config_stats);
428
429 malloc_mutex_assert_owner(tsdn, &arena->lock);
430
431 /* Merge and reset tcache stats. */
432 for (i = 0; i < NBINS; i++) {
433 arena_bin_t *bin = &arena->bins[i];
434 tcache_bin_t *tbin = &tcache->tbins[i];
435 malloc_mutex_lock(tsdn, &bin->lock);
436 bin->stats.nrequests += tbin->tstats.nrequests;
437 malloc_mutex_unlock(tsdn, &bin->lock);
438 tbin->tstats.nrequests = 0;
439 }
440
441 for (; i < nhbins; i++) {
442 malloc_large_stats_t *lstats = &arena->stats.lstats[i - NBINS];
443 tcache_bin_t *tbin = &tcache->tbins[i];
444 arena->stats.nrequests_large += tbin->tstats.nrequests;
445 lstats->nrequests += tbin->tstats.nrequests;
446 tbin->tstats.nrequests = 0;
447 }
448 }
449
450 static bool
tcaches_create_prep(tsd_t * tsd)451 tcaches_create_prep(tsd_t *tsd) {
452 bool err;
453
454 malloc_mutex_lock(tsd_tsdn(tsd), &tcaches_mtx);
455
456 if (tcaches == NULL) {
457 tcaches = base_alloc(tsd_tsdn(tsd), sizeof(tcache_t *) *
458 (MALLOCX_TCACHE_MAX+1));
459 if (tcaches == NULL) {
460 err = true;
461 goto label_return;
462 }
463 }
464
465 if (tcaches_avail == NULL && tcaches_past > MALLOCX_TCACHE_MAX) {
466 err = true;
467 goto label_return;
468 }
469
470 err = false;
471 label_return:
472 malloc_mutex_unlock(tsd_tsdn(tsd), &tcaches_mtx);
473 return err;
474 }
475
476 bool
tcaches_create(tsd_t * tsd,unsigned * r_ind)477 tcaches_create(tsd_t *tsd, unsigned *r_ind) {
478 bool err;
479 arena_t *arena;
480 tcache_t *tcache;
481 tcaches_t *elm;
482
483 if (tcaches_create_prep(tsd)) {
484 err = true;
485 goto label_return;
486 }
487
488 arena = arena_ichoose(tsd, NULL);
489 if (unlikely(arena == NULL)) {
490 err = true;
491 goto label_return;
492 }
493 tcache = tcache_create(tsd_tsdn(tsd), arena);
494 if (tcache == NULL) {
495 err = true;
496 goto label_return;
497 }
498
499 malloc_mutex_lock(tsd_tsdn(tsd), &tcaches_mtx);
500 if (tcaches_avail != NULL) {
501 elm = tcaches_avail;
502 tcaches_avail = tcaches_avail->next;
503 elm->tcache = tcache;
504 *r_ind = (unsigned)(elm - tcaches);
505 } else {
506 elm = &tcaches[tcaches_past];
507 elm->tcache = tcache;
508 *r_ind = tcaches_past;
509 tcaches_past++;
510 }
511 malloc_mutex_unlock(tsd_tsdn(tsd), &tcaches_mtx);
512
513 err = false;
514 label_return:
515 malloc_mutex_assert_not_owner(tsd_tsdn(tsd), &tcaches_mtx);
516 return err;
517 }
518
519 static void
tcaches_elm_flush(tsd_t * tsd,tcaches_t * elm)520 tcaches_elm_flush(tsd_t *tsd, tcaches_t *elm) {
521 malloc_mutex_assert_owner(tsd_tsdn(tsd), &tcaches_mtx);
522
523 if (elm->tcache == NULL) {
524 return;
525 }
526 tcache_destroy(tsd, elm->tcache);
527 elm->tcache = NULL;
528 }
529
530 void
tcaches_flush(tsd_t * tsd,unsigned ind)531 tcaches_flush(tsd_t *tsd, unsigned ind) {
532 malloc_mutex_lock(tsd_tsdn(tsd), &tcaches_mtx);
533 tcaches_elm_flush(tsd, &tcaches[ind]);
534 malloc_mutex_unlock(tsd_tsdn(tsd), &tcaches_mtx);
535 }
536
537 void
tcaches_destroy(tsd_t * tsd,unsigned ind)538 tcaches_destroy(tsd_t *tsd, unsigned ind) {
539 tcaches_t *elm;
540
541 malloc_mutex_lock(tsd_tsdn(tsd), &tcaches_mtx);
542 elm = &tcaches[ind];
543 tcaches_elm_flush(tsd, elm);
544 elm->next = tcaches_avail;
545 tcaches_avail = elm;
546 malloc_mutex_unlock(tsd_tsdn(tsd), &tcaches_mtx);
547 }
548
549 bool
tcache_boot(tsdn_t * tsdn)550 tcache_boot(tsdn_t *tsdn) {
551 unsigned i;
552
553 cassert(config_tcache);
554
555 /*
556 * If necessary, clamp opt_lg_tcache_max, now that large_maxclass is
557 * known.
558 */
559 if (opt_lg_tcache_max < 0 || (ZU(1) << opt_lg_tcache_max) < SMALL_MAXCLASS)
560 tcache_maxclass = SMALL_MAXCLASS;
561 else if ((ZU(1) << opt_lg_tcache_max) > large_maxclass)
562 tcache_maxclass = large_maxclass;
563 else
564 tcache_maxclass = (ZU(1) << opt_lg_tcache_max);
565
566 if (malloc_mutex_init(&tcaches_mtx, "tcaches", WITNESS_RANK_TCACHES)) {
567 return true;
568 }
569
570 nhbins = size2index(tcache_maxclass) + 1;
571
572 /* Initialize tcache_bin_info. */
573 tcache_bin_info = (tcache_bin_info_t *)base_alloc(tsdn, nhbins *
574 sizeof(tcache_bin_info_t));
575 if (tcache_bin_info == NULL)
576 return (true);
577 stack_nelms = 0;
578 for (i = 0; i < NBINS; i++) {
579 if ((arena_bin_info[i].nregs << 1) <= TCACHE_NSLOTS_SMALL_MIN) {
580 tcache_bin_info[i].ncached_max =
581 TCACHE_NSLOTS_SMALL_MIN;
582 } else if ((arena_bin_info[i].nregs << 1) <=
583 TCACHE_NSLOTS_SMALL_MAX) {
584 tcache_bin_info[i].ncached_max =
585 (arena_bin_info[i].nregs << 1);
586 } else {
587 tcache_bin_info[i].ncached_max =
588 TCACHE_NSLOTS_SMALL_MAX;
589 }
590 stack_nelms += tcache_bin_info[i].ncached_max;
591 }
592 for (; i < nhbins; i++) {
593 tcache_bin_info[i].ncached_max = TCACHE_NSLOTS_LARGE;
594 stack_nelms += tcache_bin_info[i].ncached_max;
595 }
596
597 return (false);
598 }
599
600 void
tcache_prefork(tsdn_t * tsdn)601 tcache_prefork(tsdn_t *tsdn) {
602 if (!config_prof && opt_tcache) {
603 malloc_mutex_prefork(tsdn, &tcaches_mtx);
604 }
605 }
606
607 void
tcache_postfork_parent(tsdn_t * tsdn)608 tcache_postfork_parent(tsdn_t *tsdn) {
609 if (!config_prof && opt_tcache) {
610 malloc_mutex_postfork_parent(tsdn, &tcaches_mtx);
611 }
612 }
613
614 void
tcache_postfork_child(tsdn_t * tsdn)615 tcache_postfork_child(tsdn_t *tsdn) {
616 if (!config_prof && opt_tcache) {
617 malloc_mutex_postfork_child(tsdn, &tcaches_mtx);
618 }
619 }
620