Edata cache small: rewrite.
In previous designs, this was intended to be a sort of cache that couldn't fail. In the current design, we want to use it just as a contention reduction mechanism. Rewrite it with those goals in mind.
This commit is contained in:
David Goldblatt
David Goldblatt
parent
c9757d9e3b
commit
03a6047111
@ -3,6 +3,16 @@
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#include "jemalloc/internal/base.h"
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/*
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* Public for tests. When we go to the fallback when the small cache is empty,
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* we grab up to 8 items (grabbing less only if the fallback is exhausted).
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* When we exceed 16, we flush. This caps the maximum memory lost per cache to
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* 16 * sizeof(edata_t), a max of 2k on architectures where the edata_t is 128
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* bytes.
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*/
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#define EDATA_CACHE_SMALL_MAX 16
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#define EDATA_CACHE_SMALL_FILL 8
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/*
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* A cache of edata_t structures allocated via base_alloc_edata (as opposed to
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* the underlying extents they describe). The contents of returned edata_t
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@ -25,32 +35,23 @@ void edata_cache_prefork(tsdn_t *tsdn, edata_cache_t *edata_cache);
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void edata_cache_postfork_parent(tsdn_t *tsdn, edata_cache_t *edata_cache);
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void edata_cache_postfork_child(tsdn_t *tsdn, edata_cache_t *edata_cache);
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/*
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* An edata_cache_small is like an edata_cache, but it relies on external
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* synchronization and avoids first-fit strategies.
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*/
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typedef struct edata_cache_small_s edata_cache_small_t;
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struct edata_cache_small_s {
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edata_list_inactive_t list;
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size_t count;
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edata_cache_t *fallback;
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bool disabled;
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};
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/*
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* An edata_cache_small is like an edata_cache, but it relies on external
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* synchronization and avoids first-fit strategies. You can call "prepare" to
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* acquire at least num edata_t objects, and then "finish" to flush all
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* excess ones back to their fallback edata_cache_t. Once they have been
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* acquired, they can be allocated without failing (and in fact, this is
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* required -- it's not permitted to attempt to get an edata_t without first
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* preparing for it).
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*/
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void edata_cache_small_init(edata_cache_small_t *ecs, edata_cache_t *fallback);
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/* Returns whether or not an error occurred. */
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bool edata_cache_small_prepare(tsdn_t *tsdn, edata_cache_small_t *ecs,
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size_t num);
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edata_t *edata_cache_small_get(edata_cache_small_t *ecs);
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void edata_cache_small_put(edata_cache_small_t *ecs, edata_t *edata);
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void edata_cache_small_finish(tsdn_t *tsdn, edata_cache_small_t *ecs,
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size_t num);
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edata_t *edata_cache_small_get(tsdn_t *tsdn, edata_cache_small_t *ecs);
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void edata_cache_small_put(tsdn_t *tsdn, edata_cache_small_t *ecs,
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edata_t *edata);
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void edata_cache_small_disable(tsdn_t *tsdn, edata_cache_small_t *ecs);
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#endif /* JEMALLOC_INTERNAL_EDATA_CACHE_H */
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@ -27,8 +27,7 @@ edata_cache_get(tsdn_t *tsdn, edata_cache_t *edata_cache) {
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return base_alloc_edata(tsdn, edata_cache->base);
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}
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edata_avail_remove(&edata_cache->avail, edata);
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size_t count = atomic_load_zu(&edata_cache->count, ATOMIC_RELAXED);
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atomic_store_zu(&edata_cache->count, count - 1, ATOMIC_RELAXED);
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atomic_load_sub_store_zu(&edata_cache->count, 1);
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malloc_mutex_unlock(tsdn, &edata_cache->mtx);
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return edata;
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}
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@ -37,8 +36,7 @@ void
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edata_cache_put(tsdn_t *tsdn, edata_cache_t *edata_cache, edata_t *edata) {
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malloc_mutex_lock(tsdn, &edata_cache->mtx);
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edata_avail_insert(&edata_cache->avail, edata);
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size_t count = atomic_load_zu(&edata_cache->count, ATOMIC_RELAXED);
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atomic_store_zu(&edata_cache->count, count + 1, ATOMIC_RELAXED);
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atomic_load_add_store_zu(&edata_cache->count, 1);
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malloc_mutex_unlock(tsdn, &edata_cache->mtx);
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}
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@ -62,48 +60,110 @@ edata_cache_small_init(edata_cache_small_t *ecs, edata_cache_t *fallback) {
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edata_list_inactive_init(&ecs->list);
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ecs->count = 0;
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ecs->fallback = fallback;
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ecs->disabled = false;
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}
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static void
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edata_cache_small_try_fill_from_fallback(tsdn_t *tsdn,
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edata_cache_small_t *ecs) {
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assert(ecs->count == 0);
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edata_t *edata;
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malloc_mutex_lock(tsdn, &ecs->fallback->mtx);
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while (ecs->count < EDATA_CACHE_SMALL_FILL) {
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edata = edata_avail_first(&ecs->fallback->avail);
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if (edata == NULL) {
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break;
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}
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edata_avail_remove(&ecs->fallback->avail, edata);
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edata_list_inactive_append(&ecs->list, edata);
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ecs->count++;
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atomic_load_sub_store_zu(&ecs->fallback->count, 1);
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}
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malloc_mutex_unlock(tsdn, &ecs->fallback->mtx);
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}
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edata_t *
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edata_cache_small_get(edata_cache_small_t *ecs) {
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assert(ecs->count > 0);
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edata_cache_small_get(tsdn_t *tsdn, edata_cache_small_t *ecs) {
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witness_assert_depth_to_rank(tsdn_witness_tsdp_get(tsdn),
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WITNESS_RANK_EDATA_CACHE, 0);
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if (ecs->disabled) {
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assert(ecs->count == 0);
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assert(edata_list_inactive_first(&ecs->list) == NULL);
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return edata_cache_get(tsdn, ecs->fallback);
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}
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edata_t *edata = edata_list_inactive_first(&ecs->list);
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assert(edata != NULL);
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edata_list_inactive_remove(&ecs->list, edata);
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ecs->count--;
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if (edata != NULL) {
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edata_list_inactive_remove(&ecs->list, edata);
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ecs->count--;
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return edata;
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}
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/* Slow path; requires synchronization. */
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edata_cache_small_try_fill_from_fallback(tsdn, ecs);
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edata = edata_list_inactive_first(&ecs->list);
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if (edata != NULL) {
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edata_list_inactive_remove(&ecs->list, edata);
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ecs->count--;
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} else {
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/*
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* Slowest path (fallback was also empty); allocate something
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* new.
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*/
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edata = base_alloc_edata(tsdn, ecs->fallback->base);
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}
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return edata;
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}
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static void
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edata_cache_small_flush_all(tsdn_t *tsdn, edata_cache_small_t *ecs) {
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/*
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* You could imagine smarter cache management policies (like
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* only flushing down to some threshold in anticipation of
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* future get requests). But just flushing everything provides
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* a good opportunity to defrag too, and lets us share code between the
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* flush and disable pathways.
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*/
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edata_t *edata;
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size_t nflushed = 0;
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malloc_mutex_lock(tsdn, &ecs->fallback->mtx);
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while ((edata = edata_list_inactive_first(&ecs->list)) != NULL) {
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edata_list_inactive_remove(&ecs->list, edata);
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edata_avail_insert(&ecs->fallback->avail, edata);
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nflushed++;
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}
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atomic_load_add_store_zu(&ecs->fallback->count, ecs->count);
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malloc_mutex_unlock(tsdn, &ecs->fallback->mtx);
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assert(nflushed == ecs->count);
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ecs->count = 0;
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}
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void
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edata_cache_small_put(edata_cache_small_t *ecs, edata_t *edata) {
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assert(edata != NULL);
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edata_list_inactive_append(&ecs->list, edata);
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ecs->count++;
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}
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edata_cache_small_put(tsdn_t *tsdn, edata_cache_small_t *ecs, edata_t *edata) {
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witness_assert_depth_to_rank(tsdn_witness_tsdp_get(tsdn),
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WITNESS_RANK_EDATA_CACHE, 0);
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bool edata_cache_small_prepare(tsdn_t *tsdn, edata_cache_small_t *ecs,
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size_t num) {
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while (ecs->count < num) {
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/*
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* Obviously, we can be smarter here and batch the locking that
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* happens inside of edata_cache_get. But for now, something
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* quick-and-dirty is fine.
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*/
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edata_t *edata = edata_cache_get(tsdn, ecs->fallback);
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if (edata == NULL) {
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return true;
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}
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ql_elm_new(edata, ql_link_inactive);
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edata_cache_small_put(ecs, edata);
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}
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return false;
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}
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void edata_cache_small_finish(tsdn_t *tsdn, edata_cache_small_t *ecs,
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size_t num) {
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while (ecs->count > num) {
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/* Same deal here -- we should be batching. */
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edata_t *edata = edata_cache_small_get(ecs);
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if (ecs->disabled) {
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assert(ecs->count == 0);
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assert(edata_list_inactive_first(&ecs->list) == NULL);
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edata_cache_put(tsdn, ecs->fallback, edata);
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return;
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}
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/*
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* Prepend rather than append, to do LIFO ordering in the hopes of some
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* cache locality.
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*/
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edata_list_inactive_prepend(&ecs->list, edata);
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ecs->count++;
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if (ecs->count > EDATA_CACHE_SMALL_MAX) {
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assert(ecs->count == EDATA_CACHE_SMALL_MAX + 1);
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edata_cache_small_flush_all(tsdn, ecs);
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}
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}
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void
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edata_cache_small_disable(tsdn_t *tsdn, edata_cache_small_t *ecs) {
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edata_cache_small_flush_all(tsdn, ecs);
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ecs->disabled = true;
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}
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@ -47,37 +47,198 @@ TEST_BEGIN(test_edata_cache) {
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}
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TEST_END
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TEST_BEGIN(test_edata_cache_small) {
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TEST_BEGIN(test_edata_cache_small_simple) {
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edata_cache_t ec;
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edata_cache_small_t ecs;
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test_edata_cache_init(&ec);
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edata_cache_small_init(&ecs, &ec);
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bool err = edata_cache_small_prepare(TSDN_NULL, &ecs, 2);
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assert_false(err, "");
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assert_zu_eq(ecs.count, 2, "");
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assert_zu_eq(atomic_load_zu(&ec.count, ATOMIC_RELAXED), 0, "");
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edata_t *ed1 = edata_cache_small_get(TSDN_NULL, &ecs);
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expect_ptr_not_null(ed1, "");
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expect_zu_eq(ecs.count, 0, "");
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expect_zu_eq(atomic_load_zu(&ec.count, ATOMIC_RELAXED), 0, "");
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edata_t *ed1 = edata_cache_small_get(&ecs);
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assert_zu_eq(ecs.count, 1, "");
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assert_zu_eq(atomic_load_zu(&ec.count, ATOMIC_RELAXED), 0, "");
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edata_t *ed2 = edata_cache_small_get(TSDN_NULL, &ecs);
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expect_ptr_not_null(ed2, "");
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expect_zu_eq(ecs.count, 0, "");
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expect_zu_eq(atomic_load_zu(&ec.count, ATOMIC_RELAXED), 0, "");
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edata_t *ed2 = edata_cache_small_get(&ecs);
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assert_zu_eq(ecs.count, 0, "");
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assert_zu_eq(atomic_load_zu(&ec.count, ATOMIC_RELAXED), 0, "");
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edata_cache_small_put(TSDN_NULL, &ecs, ed1);
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expect_zu_eq(ecs.count, 1, "");
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expect_zu_eq(atomic_load_zu(&ec.count, ATOMIC_RELAXED), 0, "");
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edata_cache_small_put(&ecs, ed1);
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assert_zu_eq(ecs.count, 1, "");
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assert_zu_eq(atomic_load_zu(&ec.count, ATOMIC_RELAXED), 0, "");
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edata_cache_small_put(TSDN_NULL, &ecs, ed2);
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expect_zu_eq(ecs.count, 2, "");
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expect_zu_eq(atomic_load_zu(&ec.count, ATOMIC_RELAXED), 0, "");
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edata_cache_small_put(&ecs, ed2);
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assert_zu_eq(ecs.count, 2, "");
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assert_zu_eq(atomic_load_zu(&ec.count, ATOMIC_RELAXED), 0, "");
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/* LIFO ordering. */
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expect_ptr_eq(ed2, edata_cache_small_get(TSDN_NULL, &ecs), "");
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expect_zu_eq(ecs.count, 1, "");
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expect_zu_eq(atomic_load_zu(&ec.count, ATOMIC_RELAXED), 0, "");
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edata_cache_small_finish(TSDN_NULL, &ecs, 1);
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assert_zu_eq(ecs.count, 1, "");
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assert_zu_eq(atomic_load_zu(&ec.count, ATOMIC_RELAXED), 1, "");
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expect_ptr_eq(ed1, edata_cache_small_get(TSDN_NULL, &ecs), "");
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expect_zu_eq(ecs.count, 0, "");
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expect_zu_eq(atomic_load_zu(&ec.count, ATOMIC_RELAXED), 0, "");
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test_edata_cache_destroy(&ec);
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}
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TEST_END
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TEST_BEGIN(test_edata_cache_fill) {
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edata_cache_t ec;
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edata_cache_small_t ecs;
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test_edata_cache_init(&ec);
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edata_cache_small_init(&ecs, &ec);
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edata_t *allocs[EDATA_CACHE_SMALL_FILL * 2];
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/*
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* If the fallback cache can't satisfy the request, we shouldn't do
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* extra allocations until compelled to. Put half the fill goal in the
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* fallback.
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*/
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for (int i = 0; i < EDATA_CACHE_SMALL_FILL / 2; i++) {
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allocs[i] = edata_cache_get(TSDN_NULL, &ec);
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}
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for (int i = 0; i < EDATA_CACHE_SMALL_FILL / 2; i++) {
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edata_cache_put(TSDN_NULL, &ec, allocs[i]);
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}
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expect_zu_eq(EDATA_CACHE_SMALL_FILL / 2,
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atomic_load_zu(&ec.count, ATOMIC_RELAXED), "");
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allocs[0] = edata_cache_small_get(TSDN_NULL, &ecs);
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expect_zu_eq(EDATA_CACHE_SMALL_FILL / 2 - 1, ecs.count,
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"Should have grabbed all edatas available but no more.");
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for (int i = 1; i < EDATA_CACHE_SMALL_FILL / 2; i++) {
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allocs[i] = edata_cache_small_get(TSDN_NULL, &ecs);
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expect_ptr_not_null(allocs[i], "");
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}
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expect_zu_eq(0, ecs.count, "");
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/* When forced, we should alloc from the base. */
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edata_t *edata = edata_cache_small_get(TSDN_NULL, &ecs);
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expect_ptr_not_null(edata, "");
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expect_zu_eq(0, ecs.count, "Allocated more than necessary");
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expect_zu_eq(0, atomic_load_zu(&ec.count, ATOMIC_RELAXED),
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"Allocated more than necessary");
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/*
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* We should correctly fill in the common case where the fallback isn't
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* exhausted, too.
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*/
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for (int i = 0; i < EDATA_CACHE_SMALL_FILL * 2; i++) {
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allocs[i] = edata_cache_get(TSDN_NULL, &ec);
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expect_ptr_not_null(allocs[i], "");
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}
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for (int i = 0; i < EDATA_CACHE_SMALL_FILL * 2; i++) {
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edata_cache_put(TSDN_NULL, &ec, allocs[i]);
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}
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allocs[0] = edata_cache_small_get(TSDN_NULL, &ecs);
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expect_zu_eq(EDATA_CACHE_SMALL_FILL - 1, ecs.count, "");
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expect_zu_eq(EDATA_CACHE_SMALL_FILL,
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atomic_load_zu(&ec.count, ATOMIC_RELAXED), "");
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for (int i = 1; i < EDATA_CACHE_SMALL_FILL; i++) {
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expect_zu_eq(EDATA_CACHE_SMALL_FILL - i, ecs.count, "");
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expect_zu_eq(EDATA_CACHE_SMALL_FILL,
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atomic_load_zu(&ec.count, ATOMIC_RELAXED), "");
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allocs[i] = edata_cache_small_get(TSDN_NULL, &ecs);
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expect_ptr_not_null(allocs[i], "");
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}
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expect_zu_eq(0, ecs.count, "");
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expect_zu_eq(EDATA_CACHE_SMALL_FILL,
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atomic_load_zu(&ec.count, ATOMIC_RELAXED), "");
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allocs[0] = edata_cache_small_get(TSDN_NULL, &ecs);
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expect_zu_eq(EDATA_CACHE_SMALL_FILL - 1, ecs.count, "");
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expect_zu_eq(0, atomic_load_zu(&ec.count, ATOMIC_RELAXED), "");
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for (int i = 1; i < EDATA_CACHE_SMALL_FILL; i++) {
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expect_zu_eq(EDATA_CACHE_SMALL_FILL - i, ecs.count, "");
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expect_zu_eq(0, atomic_load_zu(&ec.count, ATOMIC_RELAXED), "");
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allocs[i] = edata_cache_small_get(TSDN_NULL, &ecs);
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expect_ptr_not_null(allocs[i], "");
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}
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expect_zu_eq(0, ecs.count, "");
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expect_zu_eq(0, atomic_load_zu(&ec.count, ATOMIC_RELAXED), "");
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test_edata_cache_destroy(&ec);
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}
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TEST_END
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TEST_BEGIN(test_edata_cache_flush) {
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edata_cache_t ec;
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edata_cache_small_t ecs;
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test_edata_cache_init(&ec);
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edata_cache_small_init(&ecs, &ec);
|
||||
|
||||
edata_t *allocs[2 * EDATA_CACHE_SMALL_MAX + 2];
|
||||
for (int i = 0; i < 2 * EDATA_CACHE_SMALL_MAX + 2; i++) {
|
||||
allocs[i] = edata_cache_get(TSDN_NULL, &ec);
|
||||
expect_ptr_not_null(allocs[i], "");
|
||||
}
|
||||
for (int i = 0; i < EDATA_CACHE_SMALL_MAX; i++) {
|
||||
edata_cache_small_put(TSDN_NULL, &ecs, allocs[i]);
|
||||
expect_zu_eq(i + 1, ecs.count, "");
|
||||
expect_zu_eq(0, atomic_load_zu(&ec.count, ATOMIC_RELAXED), "");
|
||||
}
|
||||
edata_cache_small_put(TSDN_NULL, &ecs, allocs[EDATA_CACHE_SMALL_MAX]);
|
||||
expect_zu_eq(0, ecs.count, "");
|
||||
expect_zu_eq(EDATA_CACHE_SMALL_MAX + 1,
|
||||
atomic_load_zu(&ec.count, ATOMIC_RELAXED), "");
|
||||
|
||||
for (int i = EDATA_CACHE_SMALL_MAX + 1;
|
||||
i < 2 * EDATA_CACHE_SMALL_MAX + 1; i++) {
|
||||
edata_cache_small_put(TSDN_NULL, &ecs, allocs[i]);
|
||||
expect_zu_eq(i - EDATA_CACHE_SMALL_MAX, ecs.count, "");
|
||||
expect_zu_eq(EDATA_CACHE_SMALL_MAX + 1,
|
||||
atomic_load_zu(&ec.count, ATOMIC_RELAXED), "");
|
||||
}
|
||||
edata_cache_small_put(TSDN_NULL, &ecs, allocs[2 * EDATA_CACHE_SMALL_MAX + 1]);
|
||||
expect_zu_eq(0, ecs.count, "");
|
||||
expect_zu_eq(2 * EDATA_CACHE_SMALL_MAX + 2,
|
||||
atomic_load_zu(&ec.count, ATOMIC_RELAXED), "");
|
||||
|
||||
test_edata_cache_destroy(&ec);
|
||||
}
|
||||
TEST_END
|
||||
|
||||
TEST_BEGIN(test_edata_cache_disable) {
|
||||
edata_cache_t ec;
|
||||
edata_cache_small_t ecs;
|
||||
|
||||
test_edata_cache_init(&ec);
|
||||
edata_cache_small_init(&ecs, &ec);
|
||||
|
||||
for (int i = 0; i < EDATA_CACHE_SMALL_FILL; i++) {
|
||||
edata_t *edata = edata_cache_get(TSDN_NULL, &ec);
|
||||
expect_ptr_not_null(edata, "");
|
||||
edata_cache_small_put(TSDN_NULL, &ecs, edata);
|
||||
}
|
||||
|
||||
expect_zu_eq(EDATA_CACHE_SMALL_FILL, ecs.count, "");
|
||||
expect_zu_eq(0, atomic_load_zu(&ec.count, ATOMIC_RELAXED), "");
|
||||
|
||||
edata_cache_small_disable(TSDN_NULL, &ecs);
|
||||
|
||||
expect_zu_eq(0, ecs.count, "");
|
||||
expect_zu_eq(EDATA_CACHE_SMALL_FILL,
|
||||
atomic_load_zu(&ec.count, ATOMIC_RELAXED), "Disabling should flush");
|
||||
|
||||
edata_t *edata = edata_cache_small_get(TSDN_NULL, &ecs);
|
||||
expect_zu_eq(0, ecs.count, "");
|
||||
expect_zu_eq(EDATA_CACHE_SMALL_FILL - 1,
|
||||
atomic_load_zu(&ec.count, ATOMIC_RELAXED),
|
||||
"Disabled ecs should forward on get");
|
||||
|
||||
edata_cache_small_put(TSDN_NULL, &ecs, edata);
|
||||
expect_zu_eq(0, ecs.count, "");
|
||||
expect_zu_eq(EDATA_CACHE_SMALL_FILL,
|
||||
atomic_load_zu(&ec.count, ATOMIC_RELAXED),
|
||||
"Disabled ecs should forward on put");
|
||||
|
||||
test_edata_cache_destroy(&ec);
|
||||
}
|
||||
@ -87,5 +248,8 @@ int
|
||||
main(void) {
|
||||
return test(
|
||||
test_edata_cache,
|
||||
test_edata_cache_small);
|
||||
test_edata_cache_small_simple,
|
||||
test_edata_cache_fill,
|
||||
test_edata_cache_flush,
|
||||
test_edata_cache_disable);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user