61171a632d
Commit ccd38024bc, which introduced the pg_signal_autovacuum_worker role, added a call to pgstat_get_beentry_by_proc_number() for the purpose of determining whether the process is an autovacuum worker. This function calls pgstat_read_current_status(), which can be fairly expensive and may return cached, out-of-date information. Since we just need to look up the target backend's BackendType, and we already know its ProcNumber, we can instead inspect the BackendStatusArray directly, which is much less expensive and possibly more up-to-date. There are some caveats with this approach (which are documented in the code), but it's still substantially better than before. Reported-by: Andres Freund Reviewed-by: Andres Freund Discussion: https://postgr.es/m/ujenaa2uabzfkwxwmfifawzdozh3ljr7geozlhftsuosgm7n7q%40g3utqqyyosb6
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.