30df61990c
The private refcount entry for a buffer is often looked up repeatedly for the same buffer, e.g. to pin and then unpin a buffer. Benchmarking shows that it's worthwhile to have a one-entry cache for that case. With that cache in place, it's worth splitting GetPrivateRefCountEntry() into a small inline portion (for the cache hit case) and an out-of-line helper for the rest. This is helpful for some workloads today, but becomes more important in an upcoming patch that will utilize the private refcount infrastructure to also store whether the buffer is currently locked, as that increases the rate of lookups substantially. Reviewed-by: Melanie Plageman <melanieplageman@gmail.com> Discussion: https://postgr.es/m/6rgb2nvhyvnszz4ul3wfzlf5rheb2kkwrglthnna7qhe24onwr@vw27225tkyar
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/.