_aggregation_rng aggstate_set_extra gsl_random48 MaxAllocSize pos_period_period pos_period_timestamp random_level RelativeTimePos skiplist_alloc skiplist_delete skiplist_elempos skiplist_free SKIPLIST_GROW skiplist_headval SKIPLIST_INITIAL_CAPACITY SKIPLIST_INITIAL_FREELIST skiplist_make skiplist_period_values skiplist_splice skiplist_temporal_values skiplist_values

MaxAllocSize #define MaxAllocSize   ((Size) 0x3fffffff) /* 1 gigabyte - 1 */ Functions manipulating skiplists. Note See the description of skip lists in Wikipedia https://en.wikipedia.org/wiki/Skip_list Note also that according to https://github.com/postgres/postgres/blob/master/src/backend/utils/mmgr/README#L99 pfree/repalloc Do Not Depend On CurrentMemoryContext