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Vacuum code run both by autovacuum workers and a backend doing VACUUM/ANALYZE previously inspected VacuumCostLimit and VacuumCostDelay, which are the global variables backing the GUCs vacuum_cost_limit and vacuum_cost_delay. Autovacuum workers needed to override these variables with their own values, derived from autovacuum_vacuum_cost_limit and autovacuum_vacuum_cost_delay and worker cost limit balancing logic. This led to confusing code which, in some cases, both derived and set a new value of VacuumCostLimit from VacuumCostLimit. In preparation for refreshing these GUC values more often, introduce new, independent global variables and add a function to update them using the GUCs and existing logic. Per suggestion by Kyotaro Horiguchi Author: Melanie Plageman <melanieplageman@gmail.com> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com> Reviewed-by: Robert Haas <robertmhaas@gmail.com> Discussion: https://www.postgresql.org/message-id/flat/CAAKRu_ZngzqnEODc7LmS1NH04Kt6Y9huSjz5pp7%2BDXhrjDA0gw%40mail.gmail.com