diff options
Diffstat (limited to 'deps/jemalloc/src/tcache.c')
| -rw-r--r-- | deps/jemalloc/src/tcache.c | 798 |
1 files changed, 798 insertions, 0 deletions
diff --git a/deps/jemalloc/src/tcache.c b/deps/jemalloc/src/tcache.c new file mode 100644 index 0000000..50099a9 --- /dev/null +++ b/deps/jemalloc/src/tcache.c @@ -0,0 +1,798 @@ +#define JEMALLOC_TCACHE_C_ +#include "jemalloc/internal/jemalloc_preamble.h" +#include "jemalloc/internal/jemalloc_internal_includes.h" + +#include "jemalloc/internal/assert.h" +#include "jemalloc/internal/mutex.h" +#include "jemalloc/internal/safety_check.h" +#include "jemalloc/internal/sc.h" + +/******************************************************************************/ +/* Data. */ + +bool opt_tcache = true; +ssize_t opt_lg_tcache_max = LG_TCACHE_MAXCLASS_DEFAULT; + +cache_bin_info_t *tcache_bin_info; +static unsigned stack_nelms; /* Total stack elms per tcache. */ + +unsigned nhbins; +size_t tcache_maxclass; + +tcaches_t *tcaches; + +/* Index of first element within tcaches that has never been used. */ +static unsigned tcaches_past; + +/* Head of singly linked list tracking available tcaches elements. */ +static tcaches_t *tcaches_avail; + +/* Protects tcaches{,_past,_avail}. */ +static malloc_mutex_t tcaches_mtx; + +/******************************************************************************/ + +size_t +tcache_salloc(tsdn_t *tsdn, const void *ptr) { + return arena_salloc(tsdn, ptr); +} + +void +tcache_event_hard(tsd_t *tsd, tcache_t *tcache) { + szind_t binind = tcache->next_gc_bin; + + cache_bin_t *tbin; + if (binind < SC_NBINS) { + tbin = tcache_small_bin_get(tcache, binind); + } else { + tbin = tcache_large_bin_get(tcache, binind); + } + if (tbin->low_water > 0) { + /* + * Flush (ceiling) 3/4 of the objects below the low water mark. + */ + if (binind < SC_NBINS) { + tcache_bin_flush_small(tsd, tcache, tbin, binind, + tbin->ncached - tbin->low_water + (tbin->low_water + >> 2)); + /* + * Reduce fill count by 2X. Limit lg_fill_div such that + * the fill count is always at least 1. + */ + cache_bin_info_t *tbin_info = &tcache_bin_info[binind]; + if ((tbin_info->ncached_max >> + (tcache->lg_fill_div[binind] + 1)) >= 1) { + tcache->lg_fill_div[binind]++; + } + } else { + tcache_bin_flush_large(tsd, tbin, binind, tbin->ncached + - tbin->low_water + (tbin->low_water >> 2), tcache); + } + } else if (tbin->low_water < 0) { + /* + * Increase fill count by 2X for small bins. Make sure + * lg_fill_div stays greater than 0. + */ + if (binind < SC_NBINS && tcache->lg_fill_div[binind] > 1) { + tcache->lg_fill_div[binind]--; + } + } + tbin->low_water = tbin->ncached; + + tcache->next_gc_bin++; + if (tcache->next_gc_bin == nhbins) { + tcache->next_gc_bin = 0; + } +} + +void * +tcache_alloc_small_hard(tsdn_t *tsdn, arena_t *arena, tcache_t *tcache, + cache_bin_t *tbin, szind_t binind, bool *tcache_success) { + void *ret; + + assert(tcache->arena != NULL); + arena_tcache_fill_small(tsdn, arena, tcache, tbin, binind, + config_prof ? tcache->prof_accumbytes : 0); + if (config_prof) { + tcache->prof_accumbytes = 0; + } + ret = cache_bin_alloc_easy(tbin, tcache_success); + + return ret; +} + +/* Enabled with --enable-extra-size-check. */ +static void +tbin_extents_lookup_size_check(tsdn_t *tsdn, cache_bin_t *tbin, szind_t binind, + size_t nflush, extent_t **extents){ + rtree_ctx_t rtree_ctx_fallback; + rtree_ctx_t *rtree_ctx = tsdn_rtree_ctx(tsdn, &rtree_ctx_fallback); + + /* + * Verify that the items in the tcache all have the correct size; this + * is useful for catching sized deallocation bugs, also to fail early + * instead of corrupting metadata. Since this can be turned on for opt + * builds, avoid the branch in the loop. + */ + szind_t szind; + size_t sz_sum = binind * nflush; + for (unsigned i = 0 ; i < nflush; i++) { + rtree_extent_szind_read(tsdn, &extents_rtree, + rtree_ctx, (uintptr_t)*(tbin->avail - 1 - i), true, + &extents[i], &szind); + sz_sum -= szind; + } + if (sz_sum != 0) { + safety_check_fail("<jemalloc>: size mismatch in thread cache " + "detected, likely caused by sized deallocation bugs by " + "application. Abort.\n"); + abort(); + } +} + +void +tcache_bin_flush_small(tsd_t *tsd, tcache_t *tcache, cache_bin_t *tbin, + szind_t binind, unsigned rem) { + bool merged_stats = false; + + assert(binind < SC_NBINS); + assert((cache_bin_sz_t)rem <= tbin->ncached); + + arena_t *arena = tcache->arena; + assert(arena != NULL); + unsigned nflush = tbin->ncached - rem; + VARIABLE_ARRAY(extent_t *, item_extent, nflush); + + /* Look up extent once per item. */ + if (config_opt_safety_checks) { + tbin_extents_lookup_size_check(tsd_tsdn(tsd), tbin, binind, + nflush, item_extent); + } else { + for (unsigned i = 0 ; i < nflush; i++) { + item_extent[i] = iealloc(tsd_tsdn(tsd), + *(tbin->avail - 1 - i)); + } + } + while (nflush > 0) { + /* Lock the arena bin associated with the first object. */ + extent_t *extent = item_extent[0]; + unsigned bin_arena_ind = extent_arena_ind_get(extent); + arena_t *bin_arena = arena_get(tsd_tsdn(tsd), bin_arena_ind, + false); + unsigned binshard = extent_binshard_get(extent); + assert(binshard < bin_infos[binind].n_shards); + bin_t *bin = &bin_arena->bins[binind].bin_shards[binshard]; + + if (config_prof && bin_arena == arena) { + if (arena_prof_accum(tsd_tsdn(tsd), arena, + tcache->prof_accumbytes)) { + prof_idump(tsd_tsdn(tsd)); + } + tcache->prof_accumbytes = 0; + } + + malloc_mutex_lock(tsd_tsdn(tsd), &bin->lock); + if (config_stats && bin_arena == arena && !merged_stats) { + merged_stats = true; + bin->stats.nflushes++; + bin->stats.nrequests += tbin->tstats.nrequests; + tbin->tstats.nrequests = 0; + } + unsigned ndeferred = 0; + for (unsigned i = 0; i < nflush; i++) { + void *ptr = *(tbin->avail - 1 - i); + extent = item_extent[i]; + assert(ptr != NULL && extent != NULL); + + if (extent_arena_ind_get(extent) == bin_arena_ind + && extent_binshard_get(extent) == binshard) { + arena_dalloc_bin_junked_locked(tsd_tsdn(tsd), + bin_arena, bin, binind, extent, ptr); + } else { + /* + * This object was allocated via a different + * arena bin than the one that is currently + * locked. Stash the object, so that it can be + * handled in a future pass. + */ + *(tbin->avail - 1 - ndeferred) = ptr; + item_extent[ndeferred] = extent; + ndeferred++; + } + } + malloc_mutex_unlock(tsd_tsdn(tsd), &bin->lock); + arena_decay_ticks(tsd_tsdn(tsd), bin_arena, nflush - ndeferred); + nflush = ndeferred; + } + if (config_stats && !merged_stats) { + /* + * The flush loop didn't happen to flush to this thread's + * arena, so the stats didn't get merged. Manually do so now. + */ + unsigned binshard; + bin_t *bin = arena_bin_choose_lock(tsd_tsdn(tsd), arena, binind, + &binshard); + bin->stats.nflushes++; + bin->stats.nrequests += tbin->tstats.nrequests; + tbin->tstats.nrequests = 0; + malloc_mutex_unlock(tsd_tsdn(tsd), &bin->lock); + } + + memmove(tbin->avail - rem, tbin->avail - tbin->ncached, rem * + sizeof(void *)); + tbin->ncached = rem; + if (tbin->ncached < tbin->low_water) { + tbin->low_water = tbin->ncached; + } +} + +void +tcache_bin_flush_large(tsd_t *tsd, cache_bin_t *tbin, szind_t binind, + unsigned rem, tcache_t *tcache) { + bool merged_stats = false; + + assert(binind < nhbins); + assert((cache_bin_sz_t)rem <= tbin->ncached); + + arena_t *tcache_arena = tcache->arena; + assert(tcache_arena != NULL); + unsigned nflush = tbin->ncached - rem; + VARIABLE_ARRAY(extent_t *, item_extent, nflush); + +#ifndef JEMALLOC_EXTRA_SIZE_CHECK + /* Look up extent once per item. */ + for (unsigned i = 0 ; i < nflush; i++) { + item_extent[i] = iealloc(tsd_tsdn(tsd), *(tbin->avail - 1 - i)); + } +#else + tbin_extents_lookup_size_check(tsd_tsdn(tsd), tbin, binind, nflush, + item_extent); +#endif + while (nflush > 0) { + /* Lock the arena associated with the first object. */ + extent_t *extent = item_extent[0]; + unsigned locked_arena_ind = extent_arena_ind_get(extent); + arena_t *locked_arena = arena_get(tsd_tsdn(tsd), + locked_arena_ind, false); + bool idump; + + if (config_prof) { + idump = false; + } + + bool lock_large = !arena_is_auto(locked_arena); + if (lock_large) { + malloc_mutex_lock(tsd_tsdn(tsd), &locked_arena->large_mtx); + } + for (unsigned i = 0; i < nflush; i++) { + void *ptr = *(tbin->avail - 1 - i); + assert(ptr != NULL); + extent = item_extent[i]; + if (extent_arena_ind_get(extent) == locked_arena_ind) { + large_dalloc_prep_junked_locked(tsd_tsdn(tsd), + extent); + } + } + if ((config_prof || config_stats) && + (locked_arena == tcache_arena)) { + if (config_prof) { + idump = arena_prof_accum(tsd_tsdn(tsd), + tcache_arena, tcache->prof_accumbytes); + tcache->prof_accumbytes = 0; + } + if (config_stats) { + merged_stats = true; + arena_stats_large_flush_nrequests_add( + tsd_tsdn(tsd), &tcache_arena->stats, binind, + tbin->tstats.nrequests); + tbin->tstats.nrequests = 0; + } + } + if (lock_large) { + malloc_mutex_unlock(tsd_tsdn(tsd), &locked_arena->large_mtx); + } + + unsigned ndeferred = 0; + for (unsigned i = 0; i < nflush; i++) { + void *ptr = *(tbin->avail - 1 - i); + extent = item_extent[i]; + assert(ptr != NULL && extent != NULL); + + if (extent_arena_ind_get(extent) == locked_arena_ind) { + large_dalloc_finish(tsd_tsdn(tsd), extent); + } else { + /* + * This object was allocated via a different + * arena than the one that is currently locked. + * Stash the object, so that it can be handled + * in a future pass. + */ + *(tbin->avail - 1 - ndeferred) = ptr; + item_extent[ndeferred] = extent; + ndeferred++; + } + } + if (config_prof && idump) { + prof_idump(tsd_tsdn(tsd)); + } + arena_decay_ticks(tsd_tsdn(tsd), locked_arena, nflush - + ndeferred); + nflush = ndeferred; + } + if (config_stats && !merged_stats) { + /* + * The flush loop didn't happen to flush to this thread's + * arena, so the stats didn't get merged. Manually do so now. + */ + arena_stats_large_flush_nrequests_add(tsd_tsdn(tsd), + &tcache_arena->stats, binind, tbin->tstats.nrequests); + tbin->tstats.nrequests = 0; + } + + memmove(tbin->avail - rem, tbin->avail - tbin->ncached, rem * + sizeof(void *)); + tbin->ncached = rem; + if (tbin->ncached < tbin->low_water) { + tbin->low_water = tbin->ncached; + } +} + +void +tcache_arena_associate(tsdn_t *tsdn, tcache_t *tcache, arena_t *arena) { + assert(tcache->arena == NULL); + tcache->arena = arena; + + if (config_stats) { + /* Link into list of extant tcaches. */ + malloc_mutex_lock(tsdn, &arena->tcache_ql_mtx); + + ql_elm_new(tcache, link); + ql_tail_insert(&arena->tcache_ql, tcache, link); + cache_bin_array_descriptor_init( + &tcache->cache_bin_array_descriptor, tcache->bins_small, + tcache->bins_large); + ql_tail_insert(&arena->cache_bin_array_descriptor_ql, + &tcache->cache_bin_array_descriptor, link); + + malloc_mutex_unlock(tsdn, &arena->tcache_ql_mtx); + } +} + +static void +tcache_arena_dissociate(tsdn_t *tsdn, tcache_t *tcache) { + arena_t *arena = tcache->arena; + assert(arena != NULL); + if (config_stats) { + /* Unlink from list of extant tcaches. */ + malloc_mutex_lock(tsdn, &arena->tcache_ql_mtx); + if (config_debug) { + bool in_ql = false; + tcache_t *iter; + ql_foreach(iter, &arena->tcache_ql, link) { + if (iter == tcache) { + in_ql = true; + break; + } + } + assert(in_ql); + } + ql_remove(&arena->tcache_ql, tcache, link); + ql_remove(&arena->cache_bin_array_descriptor_ql, + &tcache->cache_bin_array_descriptor, link); + tcache_stats_merge(tsdn, tcache, arena); + malloc_mutex_unlock(tsdn, &arena->tcache_ql_mtx); + } + tcache->arena = NULL; +} + +void +tcache_arena_reassociate(tsdn_t *tsdn, tcache_t *tcache, arena_t *arena) { + tcache_arena_dissociate(tsdn, tcache); + tcache_arena_associate(tsdn, tcache, arena); +} + +bool +tsd_tcache_enabled_data_init(tsd_t *tsd) { + /* Called upon tsd initialization. */ + tsd_tcache_enabled_set(tsd, opt_tcache); + tsd_slow_update(tsd); + + if (opt_tcache) { + /* Trigger tcache init. */ + tsd_tcache_data_init(tsd); + } + + return false; +} + +/* Initialize auto tcache (embedded in TSD). */ +static void +tcache_init(tsd_t *tsd, tcache_t *tcache, void *avail_stack) { + memset(&tcache->link, 0, sizeof(ql_elm(tcache_t))); + tcache->prof_accumbytes = 0; + tcache->next_gc_bin = 0; + tcache->arena = NULL; + + ticker_init(&tcache->gc_ticker, TCACHE_GC_INCR); + + size_t stack_offset = 0; + assert((TCACHE_NSLOTS_SMALL_MAX & 1U) == 0); + memset(tcache->bins_small, 0, sizeof(cache_bin_t) * SC_NBINS); + memset(tcache->bins_large, 0, sizeof(cache_bin_t) * (nhbins - SC_NBINS)); + unsigned i = 0; + for (; i < SC_NBINS; i++) { + tcache->lg_fill_div[i] = 1; + stack_offset += tcache_bin_info[i].ncached_max * sizeof(void *); + /* + * avail points past the available space. Allocations will + * access the slots toward higher addresses (for the benefit of + * prefetch). + */ + tcache_small_bin_get(tcache, i)->avail = + (void **)((uintptr_t)avail_stack + (uintptr_t)stack_offset); + } + for (; i < nhbins; i++) { + stack_offset += tcache_bin_info[i].ncached_max * sizeof(void *); + tcache_large_bin_get(tcache, i)->avail = + (void **)((uintptr_t)avail_stack + (uintptr_t)stack_offset); + } + assert(stack_offset == stack_nelms * sizeof(void *)); +} + +/* Initialize auto tcache (embedded in TSD). */ +bool +tsd_tcache_data_init(tsd_t *tsd) { + tcache_t *tcache = tsd_tcachep_get_unsafe(tsd); + assert(tcache_small_bin_get(tcache, 0)->avail == NULL); + size_t size = stack_nelms * sizeof(void *); + /* Avoid false cacheline sharing. */ + size = sz_sa2u(size, CACHELINE); + + void *avail_array = ipallocztm(tsd_tsdn(tsd), size, CACHELINE, true, + NULL, true, arena_get(TSDN_NULL, 0, true)); + if (avail_array == NULL) { + return true; + } + + tcache_init(tsd, tcache, avail_array); + /* + * Initialization is a bit tricky here. After malloc init is done, all + * threads can rely on arena_choose and associate tcache accordingly. + * However, the thread that does actual malloc bootstrapping relies on + * functional tsd, and it can only rely on a0. In that case, we + * associate its tcache to a0 temporarily, and later on + * arena_choose_hard() will re-associate properly. + */ + tcache->arena = NULL; + arena_t *arena; + if (!malloc_initialized()) { + /* If in initialization, assign to a0. */ + arena = arena_get(tsd_tsdn(tsd), 0, false); + tcache_arena_associate(tsd_tsdn(tsd), tcache, arena); + } else { + arena = arena_choose(tsd, NULL); + /* This may happen if thread.tcache.enabled is used. */ + if (tcache->arena == NULL) { + tcache_arena_associate(tsd_tsdn(tsd), tcache, arena); + } + } + assert(arena == tcache->arena); + + return false; +} + +/* Created manual tcache for tcache.create mallctl. */ +tcache_t * +tcache_create_explicit(tsd_t *tsd) { + tcache_t *tcache; + size_t size, stack_offset; + + size = sizeof(tcache_t); + /* Naturally align the pointer stacks. */ + size = PTR_CEILING(size); + stack_offset = size; + size += stack_nelms * sizeof(void *); + /* Avoid false cacheline sharing. */ + size = sz_sa2u(size, CACHELINE); + + tcache = ipallocztm(tsd_tsdn(tsd), size, CACHELINE, true, NULL, true, + arena_get(TSDN_NULL, 0, true)); + if (tcache == NULL) { + return NULL; + } + + tcache_init(tsd, tcache, + (void *)((uintptr_t)tcache + (uintptr_t)stack_offset)); + tcache_arena_associate(tsd_tsdn(tsd), tcache, arena_ichoose(tsd, NULL)); + + return tcache; +} + +static void +tcache_flush_cache(tsd_t *tsd, tcache_t *tcache) { + assert(tcache->arena != NULL); + + for (unsigned i = 0; i < SC_NBINS; i++) { + cache_bin_t *tbin = tcache_small_bin_get(tcache, i); + tcache_bin_flush_small(tsd, tcache, tbin, i, 0); + + if (config_stats) { + assert(tbin->tstats.nrequests == 0); + } + } + for (unsigned i = SC_NBINS; i < nhbins; i++) { + cache_bin_t *tbin = tcache_large_bin_get(tcache, i); + tcache_bin_flush_large(tsd, tbin, i, 0, tcache); + + if (config_stats) { + assert(tbin->tstats.nrequests == 0); + } + } + + if (config_prof && tcache->prof_accumbytes > 0 && + arena_prof_accum(tsd_tsdn(tsd), tcache->arena, + tcache->prof_accumbytes)) { + prof_idump(tsd_tsdn(tsd)); + } +} + +void +tcache_flush(tsd_t *tsd) { + assert(tcache_available(tsd)); + tcache_flush_cache(tsd, tsd_tcachep_get(tsd)); +} + +static void +tcache_destroy(tsd_t *tsd, tcache_t *tcache, bool tsd_tcache) { + tcache_flush_cache(tsd, tcache); + arena_t *arena = tcache->arena; + tcache_arena_dissociate(tsd_tsdn(tsd), tcache); + + if (tsd_tcache) { + /* Release the avail array for the TSD embedded auto tcache. */ + void *avail_array = + (void *)((uintptr_t)tcache_small_bin_get(tcache, 0)->avail - + (uintptr_t)tcache_bin_info[0].ncached_max * sizeof(void *)); + idalloctm(tsd_tsdn(tsd), avail_array, NULL, NULL, true, true); + } else { + /* Release both the tcache struct and avail array. */ + idalloctm(tsd_tsdn(tsd), tcache, NULL, NULL, true, true); + } + + /* + * The deallocation and tcache flush above may not trigger decay since + * we are on the tcache shutdown path (potentially with non-nominal + * tsd). Manually trigger decay to avoid pathological cases. Also + * include arena 0 because the tcache array is allocated from it. + */ + arena_decay(tsd_tsdn(tsd), arena_get(tsd_tsdn(tsd), 0, false), + false, false); + + if (arena_nthreads_get(arena, false) == 0 && + !background_thread_enabled()) { + /* Force purging when no threads assigned to the arena anymore. */ + arena_decay(tsd_tsdn(tsd), arena, false, true); + } else { + arena_decay(tsd_tsdn(tsd), arena, false, false); + } +} + +/* For auto tcache (embedded in TSD) only. */ +void +tcache_cleanup(tsd_t *tsd) { + tcache_t *tcache = tsd_tcachep_get(tsd); + if (!tcache_available(tsd)) { + assert(tsd_tcache_enabled_get(tsd) == false); + if (config_debug) { + assert(tcache_small_bin_get(tcache, 0)->avail == NULL); + } + return; + } + assert(tsd_tcache_enabled_get(tsd)); + assert(tcache_small_bin_get(tcache, 0)->avail != NULL); + + tcache_destroy(tsd, tcache, true); + if (config_debug) { + tcache_small_bin_get(tcache, 0)->avail = NULL; + } +} + +void +tcache_stats_merge(tsdn_t *tsdn, tcache_t *tcache, arena_t *arena) { + unsigned i; + + cassert(config_stats); + + /* Merge and reset tcache stats. */ + for (i = 0; i < SC_NBINS; i++) { + cache_bin_t *tbin = tcache_small_bin_get(tcache, i); + unsigned binshard; + bin_t *bin = arena_bin_choose_lock(tsdn, arena, i, &binshard); + bin->stats.nrequests += tbin->tstats.nrequests; + malloc_mutex_unlock(tsdn, &bin->lock); + tbin->tstats.nrequests = 0; + } + + for (; i < nhbins; i++) { + cache_bin_t *tbin = tcache_large_bin_get(tcache, i); + arena_stats_large_flush_nrequests_add(tsdn, &arena->stats, i, + tbin->tstats.nrequests); + tbin->tstats.nrequests = 0; + } +} + +static bool +tcaches_create_prep(tsd_t *tsd) { + bool err; + + malloc_mutex_lock(tsd_tsdn(tsd), &tcaches_mtx); + + if (tcaches == NULL) { + tcaches = base_alloc(tsd_tsdn(tsd), b0get(), sizeof(tcache_t *) + * (MALLOCX_TCACHE_MAX+1), CACHELINE); + if (tcaches == NULL) { + err = true; + goto label_return; + } + } + + if (tcaches_avail == NULL && tcaches_past > MALLOCX_TCACHE_MAX) { + err = true; + goto label_return; + } + + err = false; +label_return: + malloc_mutex_unlock(tsd_tsdn(tsd), &tcaches_mtx); + return err; +} + +bool +tcaches_create(tsd_t *tsd, unsigned *r_ind) { + witness_assert_depth(tsdn_witness_tsdp_get(tsd_tsdn(tsd)), 0); + + bool err; + + if (tcaches_create_prep(tsd)) { + err = true; + goto label_return; + } + + tcache_t *tcache = tcache_create_explicit(tsd); + if (tcache == NULL) { + err = true; + goto label_return; + } + + tcaches_t *elm; + malloc_mutex_lock(tsd_tsdn(tsd), &tcaches_mtx); + if (tcaches_avail != NULL) { + elm = tcaches_avail; + tcaches_avail = tcaches_avail->next; + elm->tcache = tcache; + *r_ind = (unsigned)(elm - tcaches); + } else { + elm = &tcaches[tcaches_past]; + elm->tcache = tcache; + *r_ind = tcaches_past; + tcaches_past++; + } + malloc_mutex_unlock(tsd_tsdn(tsd), &tcaches_mtx); + + err = false; +label_return: + witness_assert_depth(tsdn_witness_tsdp_get(tsd_tsdn(tsd)), 0); + return err; +} + +static tcache_t * +tcaches_elm_remove(tsd_t *tsd, tcaches_t *elm, bool allow_reinit) { + malloc_mutex_assert_owner(tsd_tsdn(tsd), &tcaches_mtx); + + if (elm->tcache == NULL) { + return NULL; + } + tcache_t *tcache = elm->tcache; + if (allow_reinit) { + elm->tcache = TCACHES_ELM_NEED_REINIT; + } else { + elm->tcache = NULL; + } + + if (tcache == TCACHES_ELM_NEED_REINIT) { + return NULL; + } + return tcache; +} + +void +tcaches_flush(tsd_t *tsd, unsigned ind) { + malloc_mutex_lock(tsd_tsdn(tsd), &tcaches_mtx); + tcache_t *tcache = tcaches_elm_remove(tsd, &tcaches[ind], true); + malloc_mutex_unlock(tsd_tsdn(tsd), &tcaches_mtx); + if (tcache != NULL) { + /* Destroy the tcache; recreate in tcaches_get() if needed. */ + tcache_destroy(tsd, tcache, false); + } +} + +void +tcaches_destroy(tsd_t *tsd, unsigned ind) { + malloc_mutex_lock(tsd_tsdn(tsd), &tcaches_mtx); + tcaches_t *elm = &tcaches[ind]; + tcache_t *tcache = tcaches_elm_remove(tsd, elm, false); + elm->next = tcaches_avail; + tcaches_avail = elm; + malloc_mutex_unlock(tsd_tsdn(tsd), &tcaches_mtx); + if (tcache != NULL) { + tcache_destroy(tsd, tcache, false); + } +} + +bool +tcache_boot(tsdn_t *tsdn) { + /* If necessary, clamp opt_lg_tcache_max. */ + if (opt_lg_tcache_max < 0 || (ZU(1) << opt_lg_tcache_max) < + SC_SMALL_MAXCLASS) { + tcache_maxclass = SC_SMALL_MAXCLASS; + } else { + tcache_maxclass = (ZU(1) << opt_lg_tcache_max); + } + + if (malloc_mutex_init(&tcaches_mtx, "tcaches", WITNESS_RANK_TCACHES, + malloc_mutex_rank_exclusive)) { + return true; + } + + nhbins = sz_size2index(tcache_maxclass) + 1; + + /* Initialize tcache_bin_info. */ + tcache_bin_info = (cache_bin_info_t *)base_alloc(tsdn, b0get(), nhbins + * sizeof(cache_bin_info_t), CACHELINE); + if (tcache_bin_info == NULL) { + return true; + } + stack_nelms = 0; + unsigned i; + for (i = 0; i < SC_NBINS; i++) { + if ((bin_infos[i].nregs << 1) <= TCACHE_NSLOTS_SMALL_MIN) { + tcache_bin_info[i].ncached_max = + TCACHE_NSLOTS_SMALL_MIN; + } else if ((bin_infos[i].nregs << 1) <= + TCACHE_NSLOTS_SMALL_MAX) { + tcache_bin_info[i].ncached_max = + (bin_infos[i].nregs << 1); + } else { + tcache_bin_info[i].ncached_max = + TCACHE_NSLOTS_SMALL_MAX; + } + stack_nelms += tcache_bin_info[i].ncached_max; + } + for (; i < nhbins; i++) { + tcache_bin_info[i].ncached_max = TCACHE_NSLOTS_LARGE; + stack_nelms += tcache_bin_info[i].ncached_max; + } + + return false; +} + +void +tcache_prefork(tsdn_t *tsdn) { + if (!config_prof && opt_tcache) { + malloc_mutex_prefork(tsdn, &tcaches_mtx); + } +} + +void +tcache_postfork_parent(tsdn_t *tsdn) { + if (!config_prof && opt_tcache) { + malloc_mutex_postfork_parent(tsdn, &tcaches_mtx); + } +} + +void +tcache_postfork_child(tsdn_t *tsdn) { + if (!config_prof && opt_tcache) { + malloc_mutex_postfork_child(tsdn, &tcaches_mtx); + } +} |