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Allow autovacuum to reload the config file more often so that cost-based delay parameters can take effect while VACUUMing a relation. Previously, autovacuum workers only reloaded the config file once per relation vacuumed, so config changes could not take effect until beginning to vacuum the next table. Now, check if a reload is pending roughly once per block, when checking if we need to delay. In order for autovacuum workers to safely update their own cost delay and cost limit parameters without impacting performance, we had to rethink when and how these values were accessed. Previously, an autovacuum worker's wi_cost_limit was set only at the beginning of vacuuming a table, after reloading the config file. Therefore, at the time that autovac_balance_cost() was called, workers vacuuming tables with no cost-related storage parameters could still have different values for their wi_cost_limit_base and wi_cost_delay. Now that the cost parameters can be updated while vacuuming a table, workers will (within some margin of error) have no reason to have different values for cost limit and cost delay (in the absence of cost-related storage parameters). This removes the rationale for keeping cost limit and cost delay in shared memory. Balancing the cost limit requires only the number of active autovacuum workers vacuuming a table with no cost-based storage parameters. 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 |
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