diff options
Diffstat (limited to 'libnetdata/dictionary/dictionary.c')
| -rw-r--r-- | libnetdata/dictionary/dictionary.c | 282 |
1 files changed, 143 insertions, 139 deletions
diff --git a/libnetdata/dictionary/dictionary.c b/libnetdata/dictionary/dictionary.c index 061b671a..42e4a99f 100644 --- a/libnetdata/dictionary/dictionary.c +++ b/libnetdata/dictionary/dictionary.c @@ -10,9 +10,9 @@ typedef enum __attribute__ ((__packed__)) { DICT_FLAG_DESTROYED = (1 << 0), // this dictionary has been destroyed } DICT_FLAGS; -#define dict_flag_check(dict, flag) (__atomic_load_n(&((dict)->flags), __ATOMIC_SEQ_CST) & (flag)) -#define dict_flag_set(dict, flag) __atomic_or_fetch(&((dict)->flags), flag, __ATOMIC_SEQ_CST) -#define dict_flag_clear(dict, flag) __atomic_and_fetch(&((dict)->flags), ~(flag), __ATOMIC_SEQ_CST) +#define dict_flag_check(dict, flag) (__atomic_load_n(&((dict)->flags), __ATOMIC_RELAXED) & (flag)) +#define dict_flag_set(dict, flag) __atomic_or_fetch(&((dict)->flags), flag, __ATOMIC_RELAXED) +#define dict_flag_clear(dict, flag) __atomic_and_fetch(&((dict)->flags), ~(flag), __ATOMIC_RELAXED) // flags macros #define is_dictionary_destroyed(dict) dict_flag_check(dict, DICT_FLAG_DESTROYED) @@ -37,13 +37,13 @@ typedef enum __attribute__ ((__packed__)) item_flags { // IMPORTANT: This is 8-bit } ITEM_FLAGS; -#define item_flag_check(item, flag) (__atomic_load_n(&((item)->flags), __ATOMIC_SEQ_CST) & (flag)) -#define item_flag_set(item, flag) __atomic_or_fetch(&((item)->flags), flag, __ATOMIC_SEQ_CST) -#define item_flag_clear(item, flag) __atomic_and_fetch(&((item)->flags), ~(flag), __ATOMIC_SEQ_CST) +#define item_flag_check(item, flag) (__atomic_load_n(&((item)->flags), __ATOMIC_RELAXED) & (flag)) +#define item_flag_set(item, flag) __atomic_or_fetch(&((item)->flags), flag, __ATOMIC_RELAXED) +#define item_flag_clear(item, flag) __atomic_and_fetch(&((item)->flags), ~(flag), __ATOMIC_RELAXED) -#define item_shared_flag_check(item, flag) (__atomic_load_n(&((item)->shared->flags), __ATOMIC_SEQ_CST) & (flag)) -#define item_shared_flag_set(item, flag) __atomic_or_fetch(&((item)->shared->flags), flag, __ATOMIC_SEQ_CST) -#define item_shared_flag_clear(item, flag) __atomic_and_fetch(&((item)->shared->flags), ~(flag), __ATOMIC_SEQ_CST) +#define item_shared_flag_check(item, flag) (__atomic_load_n(&((item)->shared->flags), __ATOMIC_RELAXED) & (flag)) +#define item_shared_flag_set(item, flag) __atomic_or_fetch(&((item)->shared->flags), flag, __ATOMIC_RELAXED) +#define item_shared_flag_clear(item, flag) __atomic_and_fetch(&((item)->shared->flags), ~(flag), __ATOMIC_RELAXED) #define REFCOUNT_DELETING (-100) @@ -175,7 +175,7 @@ struct dictionary { long int referenced_items; // how many items of the dictionary are currently being used by 3rd parties long int pending_deletion_items; // how many items of the dictionary have been deleted, but have not been removed yet -#ifdef NETDATA_INTERNAL_CHECKS +#ifdef NETDATA_DICTIONARY_VALIDATE_POINTERS netdata_mutex_t global_pointer_registry_mutex; Pvoid_t global_pointer_registry; #endif @@ -205,59 +205,47 @@ static inline int item_is_not_referenced_and_can_be_removed_advanced(DICTIONARY // ---------------------------------------------------------------------------- // validate each pointer is indexed once - internal checks only +#ifdef NETDATA_DICTIONARY_VALIDATE_POINTERS static inline void pointer_index_init(DICTIONARY *dict __maybe_unused) { -#ifdef NETDATA_INTERNAL_CHECKS netdata_mutex_init(&dict->global_pointer_registry_mutex); -#else - ; -#endif } static inline void pointer_destroy_index(DICTIONARY *dict __maybe_unused) { -#ifdef NETDATA_INTERNAL_CHECKS netdata_mutex_lock(&dict->global_pointer_registry_mutex); JudyHSFreeArray(&dict->global_pointer_registry, PJE0); netdata_mutex_unlock(&dict->global_pointer_registry_mutex); -#else - ; -#endif } static inline void pointer_add(DICTIONARY *dict __maybe_unused, DICTIONARY_ITEM *item __maybe_unused) { -#ifdef NETDATA_INTERNAL_CHECKS netdata_mutex_lock(&dict->global_pointer_registry_mutex); Pvoid_t *PValue = JudyHSIns(&dict->global_pointer_registry, &item, sizeof(void *), PJE0); if(*PValue != NULL) fatal("pointer already exists in registry"); *PValue = item; netdata_mutex_unlock(&dict->global_pointer_registry_mutex); -#else - ; -#endif } static inline void pointer_check(DICTIONARY *dict __maybe_unused, DICTIONARY_ITEM *item __maybe_unused) { -#ifdef NETDATA_INTERNAL_CHECKS netdata_mutex_lock(&dict->global_pointer_registry_mutex); Pvoid_t *PValue = JudyHSGet(dict->global_pointer_registry, &item, sizeof(void *)); if(PValue == NULL) fatal("pointer is not found in registry"); netdata_mutex_unlock(&dict->global_pointer_registry_mutex); -#else - ; -#endif } static inline void pointer_del(DICTIONARY *dict __maybe_unused, DICTIONARY_ITEM *item __maybe_unused) { -#ifdef NETDATA_INTERNAL_CHECKS netdata_mutex_lock(&dict->global_pointer_registry_mutex); int ret = JudyHSDel(&dict->global_pointer_registry, &item, sizeof(void *), PJE0); if(!ret) fatal("pointer to be deleted does not exist in registry"); netdata_mutex_unlock(&dict->global_pointer_registry_mutex); -#else - ; -#endif } +#else // !NETDATA_DICTIONARY_VALIDATE_POINTERS +#define pointer_index_init(dict) debug_dummy() +#define pointer_destroy_index(dict) debug_dummy() +#define pointer_add(dict, item) debug_dummy() +#define pointer_check(dict, item) debug_dummy() +#define pointer_del(dict, item) debug_dummy() +#endif // !NETDATA_DICTIONARY_VALIDATE_POINTERS // ---------------------------------------------------------------------------- // memory statistics @@ -298,7 +286,7 @@ static inline void dictionary_hooks_allocate(DICTIONARY *dict) { static inline size_t dictionary_hooks_free(DICTIONARY *dict) { if(!dict->hooks) return 0; - REFCOUNT links = __atomic_sub_fetch(&dict->hooks->links, 1, __ATOMIC_SEQ_CST); + REFCOUNT links = __atomic_sub_fetch(&dict->hooks->links, 1, __ATOMIC_ACQUIRE); if(links == 0) { freez(dict->hooks); dict->hooks = NULL; @@ -356,26 +344,25 @@ size_t dictionary_version(DICTIONARY *dict) { if(unlikely(!dict)) return 0; // this is required for views to return the right number - garbage_collect_pending_deletes(dict); + // garbage_collect_pending_deletes(dict); - return __atomic_load_n(&dict->version, __ATOMIC_SEQ_CST); + return __atomic_load_n(&dict->version, __ATOMIC_RELAXED); } size_t dictionary_entries(DICTIONARY *dict) { if(unlikely(!dict)) return 0; // this is required for views to return the right number - garbage_collect_pending_deletes(dict); + // garbage_collect_pending_deletes(dict); - long int entries = __atomic_load_n(&dict->entries, __ATOMIC_SEQ_CST); - if(entries < 0) - fatal("DICTIONARY: entries is negative: %ld", entries); + long int entries = __atomic_load_n(&dict->entries, __ATOMIC_RELAXED); + internal_fatal(entries < 0, "DICTIONARY: entries is negative: %ld", entries); return entries; } size_t dictionary_referenced_items(DICTIONARY *dict) { if(unlikely(!dict)) return 0; - long int referenced_items = __atomic_load_n(&dict->referenced_items, __ATOMIC_SEQ_CST); + long int referenced_items = __atomic_load_n(&dict->referenced_items, __ATOMIC_RELAXED); if(referenced_items < 0) fatal("DICTIONARY: referenced items is negative: %ld", referenced_items); @@ -387,7 +374,7 @@ long int dictionary_stats_for_registry(DICTIONARY *dict) { return (dict->stats->memory.index + dict->stats->memory.dict); } void dictionary_version_increment(DICTIONARY *dict) { - __atomic_fetch_add(&dict->version, 1, __ATOMIC_SEQ_CST); + __atomic_fetch_add(&dict->version, 1, __ATOMIC_RELAXED); } // ---------------------------------------------------------------------------- @@ -409,9 +396,9 @@ static inline void DICTIONARY_ENTRIES_PLUS1(DICTIONARY *dict) { } else { - __atomic_fetch_add(&dict->version, 1, __ATOMIC_SEQ_CST); - __atomic_fetch_add(&dict->entries, 1, __ATOMIC_SEQ_CST); - __atomic_fetch_add(&dict->referenced_items, 1, __ATOMIC_SEQ_CST); + __atomic_fetch_add(&dict->version, 1, __ATOMIC_RELAXED); + __atomic_fetch_add(&dict->entries, 1, __ATOMIC_RELAXED); + __atomic_fetch_add(&dict->referenced_items, 1, __ATOMIC_RELAXED); } } static inline void DICTIONARY_ENTRIES_MINUS1(DICTIONARY *dict) { @@ -425,17 +412,15 @@ static inline void DICTIONARY_ENTRIES_MINUS1(DICTIONARY *dict) { entries = dict->entries++; } else { - __atomic_fetch_add(&dict->version, 1, __ATOMIC_SEQ_CST); - entries = __atomic_fetch_sub(&dict->entries, 1, __ATOMIC_SEQ_CST); + __atomic_fetch_add(&dict->version, 1, __ATOMIC_RELAXED); + entries = __atomic_fetch_sub(&dict->entries, 1, __ATOMIC_RELAXED); } -#ifdef NETDATA_INTERNAL_CHECKS - if(unlikely(entries == 0)) - fatal("DICT: negative number of entries in dictionary created from %s() (%zu@%s)", - dict->creation_function, - dict->creation_line, - dict->creation_file); -#endif + internal_fatal(entries == 0, + "DICT: negative number of entries in dictionary created from %s() (%zu@%s)", + dict->creation_function, + dict->creation_line, + dict->creation_file); } static inline void DICTIONARY_VALUE_RESETS_PLUS1(DICTIONARY *dict) { __atomic_fetch_add(&dict->stats->ops.resets, 1, __ATOMIC_RELAXED); @@ -443,7 +428,7 @@ static inline void DICTIONARY_VALUE_RESETS_PLUS1(DICTIONARY *dict) { if(unlikely(is_dictionary_single_threaded(dict))) dict->version++; else - __atomic_fetch_add(&dict->version, 1, __ATOMIC_SEQ_CST); + __atomic_fetch_add(&dict->version, 1, __ATOMIC_RELAXED); } static inline void DICTIONARY_STATS_TRAVERSALS_PLUS1(DICTIONARY *dict) { __atomic_fetch_add(&dict->stats->ops.traversals, 1, __ATOMIC_RELAXED); @@ -464,16 +449,16 @@ static inline void DICTIONARY_STATS_SEARCH_IGNORES_PLUS1(DICTIONARY *dict) { __atomic_fetch_add(&dict->stats->spin_locks.search_spins, 1, __ATOMIC_RELAXED); } static inline void DICTIONARY_STATS_CALLBACK_INSERTS_PLUS1(DICTIONARY *dict) { - __atomic_fetch_add(&dict->stats->callbacks.inserts, 1, __ATOMIC_RELAXED); + __atomic_fetch_add(&dict->stats->callbacks.inserts, 1, __ATOMIC_RELEASE); } static inline void DICTIONARY_STATS_CALLBACK_CONFLICTS_PLUS1(DICTIONARY *dict) { - __atomic_fetch_add(&dict->stats->callbacks.conflicts, 1, __ATOMIC_RELAXED); + __atomic_fetch_add(&dict->stats->callbacks.conflicts, 1, __ATOMIC_RELEASE); } static inline void DICTIONARY_STATS_CALLBACK_REACTS_PLUS1(DICTIONARY *dict) { - __atomic_fetch_add(&dict->stats->callbacks.reacts, 1, __ATOMIC_RELAXED); + __atomic_fetch_add(&dict->stats->callbacks.reacts, 1, __ATOMIC_RELEASE); } static inline void DICTIONARY_STATS_CALLBACK_DELETES_PLUS1(DICTIONARY *dict) { - __atomic_fetch_add(&dict->stats->callbacks.deletes, 1, __ATOMIC_RELAXED); + __atomic_fetch_add(&dict->stats->callbacks.deletes, 1, __ATOMIC_RELEASE); } static inline void DICTIONARY_STATS_GARBAGE_COLLECTIONS_PLUS1(DICTIONARY *dict) { __atomic_fetch_add(&dict->stats->ops.garbage_collections, 1, __ATOMIC_RELAXED); @@ -496,52 +481,48 @@ static inline void DICTIONARY_STATS_DICT_FLUSHES_PLUS1(DICTIONARY *dict) { __atomic_fetch_add(&dict->stats->ops.flushes, 1, __ATOMIC_RELAXED); } -static inline long int DICTIONARY_REFERENCED_ITEMS_PLUS1(DICTIONARY *dict) { +static inline void DICTIONARY_REFERENCED_ITEMS_PLUS1(DICTIONARY *dict) { __atomic_fetch_add(&dict->stats->items.referenced, 1, __ATOMIC_RELAXED); if(unlikely(is_dictionary_single_threaded(dict))) - return ++dict->referenced_items; + ++dict->referenced_items; else - return __atomic_add_fetch(&dict->referenced_items, 1, __ATOMIC_SEQ_CST); + __atomic_add_fetch(&dict->referenced_items, 1, __ATOMIC_RELAXED); } -static inline long int DICTIONARY_REFERENCED_ITEMS_MINUS1(DICTIONARY *dict) { +static inline void DICTIONARY_REFERENCED_ITEMS_MINUS1(DICTIONARY *dict) { __atomic_fetch_sub(&dict->stats->items.referenced, 1, __ATOMIC_RELAXED); - long int referenced_items; + long int referenced_items; (void)referenced_items; if(unlikely(is_dictionary_single_threaded(dict))) referenced_items = --dict->referenced_items; else referenced_items = __atomic_sub_fetch(&dict->referenced_items, 1, __ATOMIC_SEQ_CST); -#ifdef NETDATA_INTERNAL_CHECKS - if(unlikely(referenced_items < 0)) - fatal("DICT: negative number of referenced items (%ld) in dictionary created from %s() (%zu@%s)", - referenced_items, - dict->creation_function, - dict->creation_line, - dict->creation_file); -#endif - - return referenced_items; + internal_fatal(referenced_items < 0, + "DICT: negative number of referenced items (%ld) in dictionary created from %s() (%zu@%s)", + referenced_items, + dict->creation_function, + dict->creation_line, + dict->creation_file); } -static inline long int DICTIONARY_PENDING_DELETES_PLUS1(DICTIONARY *dict) { +static inline void DICTIONARY_PENDING_DELETES_PLUS1(DICTIONARY *dict) { __atomic_fetch_add(&dict->stats->items.pending_deletion, 1, __ATOMIC_RELAXED); if(unlikely(is_dictionary_single_threaded(dict))) - return ++dict->pending_deletion_items; + ++dict->pending_deletion_items; else - return __atomic_add_fetch(&dict->pending_deletion_items, 1, __ATOMIC_SEQ_CST); + __atomic_add_fetch(&dict->pending_deletion_items, 1, __ATOMIC_RELEASE); } static inline long int DICTIONARY_PENDING_DELETES_MINUS1(DICTIONARY *dict) { - __atomic_fetch_sub(&dict->stats->items.pending_deletion, 1, __ATOMIC_RELAXED); + __atomic_fetch_sub(&dict->stats->items.pending_deletion, 1, __ATOMIC_RELEASE); if(unlikely(is_dictionary_single_threaded(dict))) return --dict->pending_deletion_items; else - return __atomic_sub_fetch(&dict->pending_deletion_items, 1, __ATOMIC_SEQ_CST); + return __atomic_sub_fetch(&dict->pending_deletion_items, 1, __ATOMIC_ACQUIRE); } static inline long int DICTIONARY_PENDING_DELETES_GET(DICTIONARY *dict) { @@ -555,11 +536,11 @@ static inline REFCOUNT DICTIONARY_ITEM_REFCOUNT_GET(DICTIONARY *dict, DICTIONARY if(unlikely(dict && is_dictionary_single_threaded(dict))) // this is an exception, dict can be null return item->refcount; else - return (REFCOUNT)__atomic_load_n(&item->refcount, __ATOMIC_SEQ_CST); + return (REFCOUNT)__atomic_load_n(&item->refcount, __ATOMIC_ACQUIRE); } static inline REFCOUNT DICTIONARY_ITEM_REFCOUNT_GET_SOLE(DICTIONARY_ITEM *item) { - return (REFCOUNT)__atomic_load_n(&item->refcount, __ATOMIC_SEQ_CST); + return (REFCOUNT)__atomic_load_n(&item->refcount, __ATOMIC_ACQUIRE); } // ---------------------------------------------------------------------------- @@ -579,8 +560,8 @@ static void dictionary_execute_insert_callback(DICTIONARY *dict, DICTIONARY_ITEM dict->creation_line, dict->creation_file); - DICTIONARY_STATS_CALLBACK_INSERTS_PLUS1(dict); dict->hooks->ins_callback(item, item->shared->value, constructor_data?constructor_data:dict->hooks->ins_callback_data); + DICTIONARY_STATS_CALLBACK_INSERTS_PLUS1(dict); } static bool dictionary_execute_conflict_callback(DICTIONARY *dict, DICTIONARY_ITEM *item, void *new_value, void *constructor_data) { @@ -597,10 +578,13 @@ static bool dictionary_execute_conflict_callback(DICTIONARY *dict, DICTIONARY_IT dict->creation_line, dict->creation_file); - DICTIONARY_STATS_CALLBACK_CONFLICTS_PLUS1(dict); - return dict->hooks->conflict_callback( + bool ret = dict->hooks->conflict_callback( item, item->shared->value, new_value, constructor_data ? constructor_data : dict->hooks->conflict_callback_data); + + DICTIONARY_STATS_CALLBACK_CONFLICTS_PLUS1(dict); + + return ret; } static void dictionary_execute_react_callback(DICTIONARY *dict, DICTIONARY_ITEM *item, void *constructor_data) { @@ -617,9 +601,10 @@ static void dictionary_execute_react_callback(DICTIONARY *dict, DICTIONARY_ITEM dict->creation_line, dict->creation_file); - DICTIONARY_STATS_CALLBACK_REACTS_PLUS1(dict); dict->hooks->react_callback(item, item->shared->value, constructor_data?constructor_data:dict->hooks->react_callback_data); + + DICTIONARY_STATS_CALLBACK_REACTS_PLUS1(dict); } static void dictionary_execute_delete_callback(DICTIONARY *dict, DICTIONARY_ITEM *item) { @@ -637,8 +622,9 @@ static void dictionary_execute_delete_callback(DICTIONARY *dict, DICTIONARY_ITEM dict->creation_line, dict->creation_file); - DICTIONARY_STATS_CALLBACK_DELETES_PLUS1(dict); dict->hooks->del_callback(item, item->shared->value, dict->hooks->del_callback_data); + + DICTIONARY_STATS_CALLBACK_DELETES_PLUS1(dict); } // ---------------------------------------------------------------------------- @@ -648,8 +634,8 @@ static inline size_t dictionary_locks_init(DICTIONARY *dict) { if(likely(!is_dictionary_single_threaded(dict))) { netdata_rwlock_init(&dict->index.rwlock); netdata_rwlock_init(&dict->items.rwlock); - return 0; } + return 0; } @@ -657,29 +643,29 @@ static inline size_t dictionary_locks_destroy(DICTIONARY *dict) { if(likely(!is_dictionary_single_threaded(dict))) { netdata_rwlock_destroy(&dict->index.rwlock); netdata_rwlock_destroy(&dict->items.rwlock); - return 0; } + return 0; } static inline void ll_recursive_lock_set_thread_as_writer(DICTIONARY *dict) { pid_t expected = 0, desired = gettid(); - if(!__atomic_compare_exchange_n(&dict->items.writer_pid, &expected, desired, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)) - fatal("DICTIONARY: Cannot set thread %d as exclusive writer, expected %d, desired %d, found %d.", gettid(), expected, desired, __atomic_load_n(&dict->items.writer_pid, __ATOMIC_SEQ_CST)); + if(!__atomic_compare_exchange_n(&dict->items.writer_pid, &expected, desired, false, __ATOMIC_RELAXED, __ATOMIC_RELAXED)) + fatal("DICTIONARY: Cannot set thread %d as exclusive writer, expected %d, desired %d, found %d.", gettid(), expected, desired, __atomic_load_n(&dict->items.writer_pid, __ATOMIC_RELAXED)); } static inline void ll_recursive_unlock_unset_thread_writer(DICTIONARY *dict) { pid_t expected = gettid(), desired = 0; - if(!__atomic_compare_exchange_n(&dict->items.writer_pid, &expected, desired, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)) - fatal("DICTIONARY: Cannot unset thread %d as exclusive writer, expected %d, desired %d, found %d.", gettid(), expected, desired, __atomic_load_n(&dict->items.writer_pid, __ATOMIC_SEQ_CST)); + if(!__atomic_compare_exchange_n(&dict->items.writer_pid, &expected, desired, false, __ATOMIC_RELAXED, __ATOMIC_RELAXED)) + fatal("DICTIONARY: Cannot unset thread %d as exclusive writer, expected %d, desired %d, found %d.", gettid(), expected, desired, __atomic_load_n(&dict->items.writer_pid, __ATOMIC_RELAXED)); } static inline bool ll_recursive_lock_is_thread_the_writer(DICTIONARY *dict) { pid_t tid = gettid(); - return tid > 0 && tid == __atomic_load_n(&dict->items.writer_pid, __ATOMIC_SEQ_CST); + return tid > 0 && tid == __atomic_load_n(&dict->items.writer_pid, __ATOMIC_RELAXED); } -static void ll_recursive_lock(DICTIONARY *dict, char rw) { +static inline void ll_recursive_lock(DICTIONARY *dict, char rw) { if(unlikely(is_dictionary_single_threaded(dict))) return; @@ -699,7 +685,7 @@ static void ll_recursive_lock(DICTIONARY *dict, char rw) { } } -static void ll_recursive_unlock(DICTIONARY *dict, char rw) { +static inline void ll_recursive_unlock(DICTIONARY *dict, char rw) { if(unlikely(is_dictionary_single_threaded(dict))) return; @@ -722,10 +708,10 @@ static void ll_recursive_unlock(DICTIONARY *dict, char rw) { } } -void dictionary_write_lock(DICTIONARY *dict) { +inline void dictionary_write_lock(DICTIONARY *dict) { ll_recursive_lock(dict, DICTIONARY_LOCK_WRITE); } -void dictionary_write_unlock(DICTIONARY *dict) { +inline void dictionary_write_unlock(DICTIONARY *dict) { ll_recursive_unlock(dict, DICTIONARY_LOCK_WRITE); } @@ -760,8 +746,8 @@ static inline void dictionary_index_wrlock_unlock(DICTIONARY *dict) { // items garbage collector static void garbage_collect_pending_deletes(DICTIONARY *dict) { - usec_t last_master_deletion_us = dict->hooks?__atomic_load_n(&dict->hooks->last_master_deletion_us, __ATOMIC_SEQ_CST):0; - usec_t last_gc_run_us = __atomic_load_n(&dict->last_gc_run_us, __ATOMIC_SEQ_CST); + usec_t last_master_deletion_us = dict->hooks?__atomic_load_n(&dict->hooks->last_master_deletion_us, __ATOMIC_RELAXED):0; + usec_t last_gc_run_us = __atomic_load_n(&dict->last_gc_run_us, __ATOMIC_RELAXED); bool is_view = is_view_dictionary(dict); @@ -773,7 +759,7 @@ static void garbage_collect_pending_deletes(DICTIONARY *dict) { ll_recursive_lock(dict, DICTIONARY_LOCK_WRITE); - __atomic_store_n(&dict->last_gc_run_us, now_realtime_usec(), __ATOMIC_SEQ_CST); + __atomic_store_n(&dict->last_gc_run_us, now_realtime_usec(), __ATOMIC_RELAXED); if(is_view) dictionary_index_lock_wrlock(dict); @@ -819,25 +805,27 @@ static void garbage_collect_pending_deletes(DICTIONARY *dict) { (void)deleted; (void)examined; - internal_error(false, "DICTIONARY: garbage collected dictionary created by %s (%zu@%s), examined %zu items, deleted %zu items, still pending %zu items", - dict->creation_function, dict->creation_line, dict->creation_file, examined, deleted, pending); + internal_error(false, "DICTIONARY: garbage collected dictionary created by %s (%zu@%s), " + "examined %zu items, deleted %zu items, still pending %zu items", + dict->creation_function, dict->creation_line, dict->creation_file, + examined, deleted, pending); +} +void dictionary_garbage_collect(DICTIONARY *dict) { + if(!dict) return; + garbage_collect_pending_deletes(dict); } // ---------------------------------------------------------------------------- // reference counters -static inline size_t reference_counter_init(DICTIONARY *dict) { - (void)dict; - +static inline size_t reference_counter_init(DICTIONARY *dict __maybe_unused) { // allocate memory required for reference counters // return number of bytes return 0; } -static inline size_t reference_counter_free(DICTIONARY *dict) { - (void)dict; - +static inline size_t reference_counter_free(DICTIONARY *dict __maybe_unused) { // free memory required for reference counters // return number of bytes return 0; @@ -846,13 +834,13 @@ static inline size_t reference_counter_free(DICTIONARY *dict) { static void item_acquire(DICTIONARY *dict, DICTIONARY_ITEM *item) { REFCOUNT refcount; - if(unlikely(is_dictionary_single_threaded(dict))) { + if(unlikely(is_dictionary_single_threaded(dict))) refcount = ++item->refcount; - } - else { + + else // increment the refcount refcount = __atomic_add_fetch(&item->refcount, 1, __ATOMIC_SEQ_CST); - } + if(refcount <= 0) { internal_error( @@ -900,7 +888,7 @@ static void item_release(DICTIONARY *dict, DICTIONARY_ITEM *item) { is_deleted = item_flag_check(item, ITEM_FLAG_DELETED); // decrement the refcount - refcount = __atomic_sub_fetch(&item->refcount, 1, __ATOMIC_SEQ_CST); + refcount = __atomic_sub_fetch(&item->refcount, 1, __ATOMIC_RELEASE); } if(refcount < 0) { @@ -956,14 +944,14 @@ static int item_check_and_acquire_advanced(DICTIONARY *dict, DICTIONARY_ITEM *it desired = refcount + 1; - } while(!__atomic_compare_exchange_n(&item->refcount, &refcount, desired, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)); + } while(!__atomic_compare_exchange_n(&item->refcount, &refcount, desired, false, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED)); // if ret == ITEM_OK, we acquired the item if(ret == RC_ITEM_OK) { - if (is_view_dictionary(dict) && + if (unlikely(is_view_dictionary(dict) && item_shared_flag_check(item, ITEM_FLAG_DELETED) && - !item_flag_check(item, ITEM_FLAG_DELETED)) { + !item_flag_check(item, ITEM_FLAG_DELETED))) { // but, we can't use this item if (having_index_lock) { @@ -979,7 +967,7 @@ static int item_check_and_acquire_advanced(DICTIONARY *dict, DICTIONARY_ITEM *it dict_item_set_deleted(dict, item); // decrement the refcount we incremented above - if (__atomic_sub_fetch(&item->refcount, 1, __ATOMIC_SEQ_CST) == 0) { + if (__atomic_sub_fetch(&item->refcount, 1, __ATOMIC_RELEASE) == 0) { // this is a deleted item, and we are the last one DICTIONARY_PENDING_DELETES_PLUS1(dict); } @@ -988,7 +976,7 @@ static int item_check_and_acquire_advanced(DICTIONARY *dict, DICTIONARY_ITEM *it } else { // this is traversal / walkthrough // decrement the refcount we incremented above - __atomic_sub_fetch(&item->refcount, 1, __ATOMIC_SEQ_CST); + __atomic_sub_fetch(&item->refcount, 1, __ATOMIC_RELEASE); } return RC_ITEM_MARKED_FOR_DELETION; @@ -998,7 +986,6 @@ static int item_check_and_acquire_advanced(DICTIONARY *dict, DICTIONARY_ITEM *it DICTIONARY_REFERENCED_ITEMS_PLUS1(dict); } - if(unlikely(spins > 1 && dict->stats)) DICTIONARY_STATS_CHECK_SPINS_PLUS(dict, spins - 1); @@ -1037,7 +1024,7 @@ static inline int item_is_not_referenced_and_can_be_removed_advanced(DICTIONARY ret = RC_ITEM_IS_CURRENTLY_BEING_CREATED; break; } - } while(!__atomic_compare_exchange_n(&item->refcount, &refcount, desired, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)); + } while(!__atomic_compare_exchange_n(&item->refcount, &refcount, desired, false, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED)); #ifdef NETDATA_INTERNAL_CHECKS if(ret == RC_ITEM_OK) @@ -1055,8 +1042,8 @@ static inline int item_is_not_referenced_and_can_be_removed_advanced(DICTIONARY static inline bool item_shared_release_and_check_if_it_can_be_freed(DICTIONARY *dict __maybe_unused, DICTIONARY_ITEM *item) { // if we can set refcount to REFCOUNT_DELETING, we can delete this item - REFCOUNT links = __atomic_sub_fetch(&item->shared->links, 1, __ATOMIC_SEQ_CST); - if(links == 0 && __atomic_compare_exchange_n(&item->shared->links, &links, REFCOUNT_DELETING, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)) { + REFCOUNT links = __atomic_sub_fetch(&item->shared->links, 1, __ATOMIC_RELEASE); + if(links == 0 && __atomic_compare_exchange_n(&item->shared->links, &links, REFCOUNT_DELETING, false, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED)) { // we can delete it return true; @@ -1290,7 +1277,7 @@ static DICTIONARY_ITEM *dict_item_create(DICTIONARY *dict __maybe_unused, size_t if(master_item) { item->shared = master_item->shared; - if(unlikely(__atomic_add_fetch(&item->shared->links, 1, __ATOMIC_SEQ_CST) <= 1)) + if(unlikely(__atomic_add_fetch(&item->shared->links, 1, __ATOMIC_ACQUIRE) <= 1)) fatal("DICTIONARY: attempted to link to a shared item structure that had zero references"); } else { @@ -1478,7 +1465,7 @@ static void dict_item_shared_set_deleted(DICTIONARY *dict, DICTIONARY_ITEM *item item_shared_flag_set(item, ITEM_FLAG_DELETED); if(dict->hooks) - __atomic_store_n(&dict->hooks->last_master_deletion_us, now_realtime_usec(), __ATOMIC_SEQ_CST); + __atomic_store_n(&dict->hooks->last_master_deletion_us, now_realtime_usec(), __ATOMIC_RELAXED); } } @@ -1486,7 +1473,7 @@ static void dict_item_shared_set_deleted(DICTIONARY *dict, DICTIONARY_ITEM *item static bool dict_item_set_deleted(DICTIONARY *dict, DICTIONARY_ITEM *item) { ITEM_FLAGS expected, desired; - expected = __atomic_load_n(&item->flags, __ATOMIC_SEQ_CST); + expected = __atomic_load_n(&item->flags, __ATOMIC_RELAXED); do { @@ -1495,7 +1482,7 @@ static bool dict_item_set_deleted(DICTIONARY *dict, DICTIONARY_ITEM *item) { desired = expected | ITEM_FLAG_DELETED; - } while(!__atomic_compare_exchange_n(&item->flags, &expected, desired, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)); + } while(!__atomic_compare_exchange_n(&item->flags, &expected, desired, false, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED)); DICTIONARY_ENTRIES_MINUS1(dict); return true; @@ -2063,11 +2050,11 @@ DICTIONARY *dictionary_create_view(DICTIONARY *master) { dictionary_hooks_allocate(master); - if(unlikely(__atomic_load_n(&master->hooks->links, __ATOMIC_SEQ_CST)) < 1) + if(unlikely(__atomic_load_n(&master->hooks->links, __ATOMIC_RELAXED)) < 1) fatal("DICTIONARY: attempted to create a view that has %d links", master->hooks->links); dict->hooks = master->hooks; - __atomic_add_fetch(&master->hooks->links, 1, __ATOMIC_SEQ_CST); + __atomic_add_fetch(&master->hooks->links, 1, __ATOMIC_ACQUIRE); #ifdef NETDATA_INTERNAL_CHECKS dict->creation_function = function; @@ -2167,6 +2154,8 @@ DICT_ITEM_CONST DICTIONARY_ITEM *dictionary_view_set_and_acquire_item_advanced(D if(unlikely(is_master_dictionary(dict))) fatal("DICTIONARY: this dictionary is a master, you cannot add items from other dictionaries."); + garbage_collect_pending_deletes(dict); + dictionary_acquired_item_dup(dict->master, master_item); DICTIONARY_ITEM *item = dict_item_add_or_reset_value_and_acquire(dict, name, name_len, NULL, 0, NULL, master_item); dictionary_acquired_item_release(dict->master, master_item); @@ -2289,7 +2278,7 @@ void *dictionary_foreach_start_rw(DICTFE *dfe, DICTIONARY *dict, char rw) { dfe->counter = 0; dfe->dict = dict; dfe->rw = rw; - + dfe->locked = true; ll_recursive_lock(dict, dfe->rw); DICTIONARY_STATS_TRAVERSALS_PLUS1(dict); @@ -2312,8 +2301,10 @@ void *dictionary_foreach_start_rw(DICTFE *dfe, DICTIONARY *dict, char rw) { dfe->value = NULL; } - if(unlikely(dfe->rw == DICTIONARY_LOCK_REENTRANT)) + if(unlikely(dfe->rw == DICTIONARY_LOCK_REENTRANT)) { ll_recursive_unlock(dfe->dict, dfe->rw); + dfe->locked = false; + } return dfe->value; } @@ -2329,8 +2320,10 @@ void *dictionary_foreach_next(DICTFE *dfe) { return NULL; } - if(unlikely(dfe->rw == DICTIONARY_LOCK_REENTRANT)) + if(unlikely(dfe->rw == DICTIONARY_LOCK_REENTRANT) || !dfe->locked) { ll_recursive_lock(dfe->dict, dfe->rw); + dfe->locked = true; + } // the item we just did DICTIONARY_ITEM *item = dfe->item; @@ -2360,12 +2353,21 @@ void *dictionary_foreach_next(DICTFE *dfe) { dfe->value = NULL; } - if(unlikely(dfe->rw == DICTIONARY_LOCK_REENTRANT)) + if(unlikely(dfe->rw == DICTIONARY_LOCK_REENTRANT)) { ll_recursive_unlock(dfe->dict, dfe->rw); + dfe->locked = false; + } return dfe->value; } +void dictionary_foreach_unlock(DICTFE *dfe) { + if(dfe->locked) { + ll_recursive_unlock(dfe->dict, dfe->rw); + dfe->locked = false; + } +} + void dictionary_foreach_done(DICTFE *dfe) { if(unlikely(!dfe || !dfe->dict)) return; @@ -2383,8 +2385,10 @@ void dictionary_foreach_done(DICTFE *dfe) { // item_release(dfe->dict, item); } - if(likely(dfe->rw != DICTIONARY_LOCK_REENTRANT)) + if(likely(dfe->rw != DICTIONARY_LOCK_REENTRANT) && dfe->locked) { ll_recursive_unlock(dfe->dict, dfe->rw); + dfe->locked = false; + } dfe->dict = NULL; dfe->item = NULL; @@ -2472,7 +2476,7 @@ int dictionary_sorted_walkthrough_rw(DICTIONARY *dict, char rw, int (*callback)( DICTIONARY_STATS_WALKTHROUGHS_PLUS1(dict); ll_recursive_lock(dict, rw); - size_t entries = __atomic_load_n(&dict->entries, __ATOMIC_SEQ_CST); + size_t entries = __atomic_load_n(&dict->entries, __ATOMIC_RELAXED); DICTIONARY_ITEM **array = mallocz(sizeof(DICTIONARY_ITEM *) * entries); size_t i; @@ -3293,12 +3297,12 @@ static void *unittest_dict_master_thread(void *arg) { DICTIONARY_ITEM *item = NULL; int loops = 0; - while(!__atomic_load_n(&tv->join, __ATOMIC_SEQ_CST)) { + while(!__atomic_load_n(&tv->join, __ATOMIC_RELAXED)) { if(!item) item = dictionary_set_and_acquire_item(tv->master, "ITEM1", "123", strlen("123") + 1); - if(__atomic_load_n(&tv->item_master, __ATOMIC_SEQ_CST) != NULL) { + if(__atomic_load_n(&tv->item_master, __ATOMIC_RELAXED) != NULL) { dictionary_acquired_item_release(tv->master, item); dictionary_del(tv->master, "ITEM1"); item = NULL; @@ -3307,7 +3311,7 @@ static void *unittest_dict_master_thread(void *arg) { } dictionary_acquired_item_dup(tv->master, item); // for the view thread - __atomic_store_n(&tv->item_master, item, __ATOMIC_SEQ_CST); + __atomic_store_n(&tv->item_master, item, __ATOMIC_RELAXED); dictionary_del(tv->master, "ITEM1"); @@ -3333,13 +3337,13 @@ static void *unittest_dict_view_thread(void *arg) { DICTIONARY_ITEM *m_item = NULL; - while(!__atomic_load_n(&tv->join, __ATOMIC_SEQ_CST)) { - if(!(m_item = __atomic_load_n(&tv->item_master, __ATOMIC_SEQ_CST))) + while(!__atomic_load_n(&tv->join, __ATOMIC_RELAXED)) { + if(!(m_item = __atomic_load_n(&tv->item_master, __ATOMIC_RELAXED))) continue; DICTIONARY_ITEM *v_item = dictionary_view_set_and_acquire_item(tv->view, "ITEM2", m_item); dictionary_acquired_item_release(tv->master, m_item); - __atomic_store_n(&tv->item_master, NULL, __ATOMIC_SEQ_CST); + __atomic_store_n(&tv->item_master, NULL, __ATOMIC_RELAXED); for(int i = 0; i < tv->dups ; i++) { dictionary_acquired_item_dup(tv->view, v_item); @@ -3351,7 +3355,7 @@ static void *unittest_dict_view_thread(void *arg) { dictionary_del(tv->view, "ITEM2"); - while(!__atomic_load_n(&tv->join, __ATOMIC_SEQ_CST) && !(m_item = __atomic_load_n(&tv->item_master, __ATOMIC_SEQ_CST))) { + while(!__atomic_load_n(&tv->join, __ATOMIC_RELAXED) && !(m_item = __atomic_load_n(&tv->item_master, __ATOMIC_RELAXED))) { dictionary_acquired_item_dup(tv->view, v_item); dictionary_acquired_item_release(tv->view, v_item); } @@ -3522,7 +3526,7 @@ size_t dictionary_unittest_views(void) { fprintf(stderr, "\nPASS 2: Deleting master item:\n"); dictionary_del(master, "KEY 1"); - dictionary_version(view); + garbage_collect_pending_deletes(view); errors += unittest_check_dictionary("master", master, 0, 0, 1, 1, 0); errors += unittest_check_dictionary("view", view, 0, 0, 1, 1, 0); errors += unittest_check_item("master", master, item1_on_master, "KEY 1", item1_on_master->shared->value, 1, ITEM_FLAG_DELETED, false, false, true); |