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It seems plausible that someone might want to experiment with different values. The pressing reason though is that I'm reviewing a patch that requires pg_upgrade to manipulate SLRU files. That patch needs to access SLRU_PAGES_PER_SEGMENT from pg_upgrade code, and slru.h, where SLRU_PAGES_PER_SEGMENT is currently defined, cannot be included from frontend code. Moving it to pg_config_manual.h makes it accessible. Now that it's a little more likely that someone might change SLRU_PAGES_PER_SEGMENT, add a cluster compatibility check for it. Bump catalog version because of the new field in the control file. Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Reviewed-by: Álvaro Herrera <alvherre@kurilemu.de> Discussion: https://www.postgresql.org/message-id/c7a4ea90-9f7b-4953-81be-b3fcb47db057@iki.fi
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/.