diff options
Diffstat (limited to 'deps/jemalloc/src/edata_cache.c')
| -rw-r--r-- | deps/jemalloc/src/edata_cache.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/deps/jemalloc/src/edata_cache.c b/deps/jemalloc/src/edata_cache.c new file mode 100644 index 0000000..6bc1848 --- /dev/null +++ b/deps/jemalloc/src/edata_cache.c @@ -0,0 +1,154 @@ +#include "jemalloc/internal/jemalloc_preamble.h" +#include "jemalloc/internal/jemalloc_internal_includes.h" + +bool +edata_cache_init(edata_cache_t *edata_cache, base_t *base) { + edata_avail_new(&edata_cache->avail); + /* + * This is not strictly necessary, since the edata_cache_t is only + * created inside an arena, which is zeroed on creation. But this is + * handy as a safety measure. + */ + atomic_store_zu(&edata_cache->count, 0, ATOMIC_RELAXED); + if (malloc_mutex_init(&edata_cache->mtx, "edata_cache", + WITNESS_RANK_EDATA_CACHE, malloc_mutex_rank_exclusive)) { + return true; + } + edata_cache->base = base; + return false; +} + +edata_t * +edata_cache_get(tsdn_t *tsdn, edata_cache_t *edata_cache) { + malloc_mutex_lock(tsdn, &edata_cache->mtx); + edata_t *edata = edata_avail_first(&edata_cache->avail); + if (edata == NULL) { + malloc_mutex_unlock(tsdn, &edata_cache->mtx); + return base_alloc_edata(tsdn, edata_cache->base); + } + edata_avail_remove(&edata_cache->avail, edata); + atomic_load_sub_store_zu(&edata_cache->count, 1); + malloc_mutex_unlock(tsdn, &edata_cache->mtx); + return edata; +} + +void +edata_cache_put(tsdn_t *tsdn, edata_cache_t *edata_cache, edata_t *edata) { + malloc_mutex_lock(tsdn, &edata_cache->mtx); + edata_avail_insert(&edata_cache->avail, edata); + atomic_load_add_store_zu(&edata_cache->count, 1); + malloc_mutex_unlock(tsdn, &edata_cache->mtx); +} + +void +edata_cache_prefork(tsdn_t *tsdn, edata_cache_t *edata_cache) { + malloc_mutex_prefork(tsdn, &edata_cache->mtx); +} + +void +edata_cache_postfork_parent(tsdn_t *tsdn, edata_cache_t *edata_cache) { + malloc_mutex_postfork_parent(tsdn, &edata_cache->mtx); +} + +void +edata_cache_postfork_child(tsdn_t *tsdn, edata_cache_t *edata_cache) { + malloc_mutex_postfork_child(tsdn, &edata_cache->mtx); +} + +void +edata_cache_fast_init(edata_cache_fast_t *ecs, edata_cache_t *fallback) { + edata_list_inactive_init(&ecs->list); + ecs->fallback = fallback; + ecs->disabled = false; +} + +static void +edata_cache_fast_try_fill_from_fallback(tsdn_t *tsdn, + edata_cache_fast_t *ecs) { + edata_t *edata; + malloc_mutex_lock(tsdn, &ecs->fallback->mtx); + for (int i = 0; i < EDATA_CACHE_FAST_FILL; i++) { + edata = edata_avail_remove_first(&ecs->fallback->avail); + if (edata == NULL) { + break; + } + edata_list_inactive_append(&ecs->list, edata); + atomic_load_sub_store_zu(&ecs->fallback->count, 1); + } + malloc_mutex_unlock(tsdn, &ecs->fallback->mtx); +} + +edata_t * +edata_cache_fast_get(tsdn_t *tsdn, edata_cache_fast_t *ecs) { + witness_assert_depth_to_rank(tsdn_witness_tsdp_get(tsdn), + WITNESS_RANK_EDATA_CACHE, 0); + + if (ecs->disabled) { + assert(edata_list_inactive_first(&ecs->list) == NULL); + return edata_cache_get(tsdn, ecs->fallback); + } + + edata_t *edata = edata_list_inactive_first(&ecs->list); + if (edata != NULL) { + edata_list_inactive_remove(&ecs->list, edata); + return edata; + } + /* Slow path; requires synchronization. */ + edata_cache_fast_try_fill_from_fallback(tsdn, ecs); + edata = edata_list_inactive_first(&ecs->list); + if (edata != NULL) { + edata_list_inactive_remove(&ecs->list, edata); + } else { + /* + * Slowest path (fallback was also empty); allocate something + * new. + */ + edata = base_alloc_edata(tsdn, ecs->fallback->base); + } + return edata; +} + +static void +edata_cache_fast_flush_all(tsdn_t *tsdn, edata_cache_fast_t *ecs) { + /* + * You could imagine smarter cache management policies (like + * only flushing down to some threshold in anticipation of + * future get requests). But just flushing everything provides + * a good opportunity to defrag too, and lets us share code between the + * flush and disable pathways. + */ + edata_t *edata; + size_t nflushed = 0; + malloc_mutex_lock(tsdn, &ecs->fallback->mtx); + while ((edata = edata_list_inactive_first(&ecs->list)) != NULL) { + edata_list_inactive_remove(&ecs->list, edata); + edata_avail_insert(&ecs->fallback->avail, edata); + nflushed++; + } + atomic_load_add_store_zu(&ecs->fallback->count, nflushed); + malloc_mutex_unlock(tsdn, &ecs->fallback->mtx); +} + +void +edata_cache_fast_put(tsdn_t *tsdn, edata_cache_fast_t *ecs, edata_t *edata) { + witness_assert_depth_to_rank(tsdn_witness_tsdp_get(tsdn), + WITNESS_RANK_EDATA_CACHE, 0); + + if (ecs->disabled) { + assert(edata_list_inactive_first(&ecs->list) == NULL); + edata_cache_put(tsdn, ecs->fallback, edata); + return; + } + + /* + * Prepend rather than append, to do LIFO ordering in the hopes of some + * cache locality. + */ + edata_list_inactive_prepend(&ecs->list, edata); +} + +void +edata_cache_fast_disable(tsdn_t *tsdn, edata_cache_fast_t *ecs) { + edata_cache_fast_flush_all(tsdn, ecs); + ecs->disabled = true; +} |