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Previously, regex_t objects' memory was managed with malloc() and free() directly. Switch to palloc()-based memory management instead. Advantages: * memory used by cached regexes is now visible with MemoryContext observability tools * cleanup can be done automatically in certain failure modes (something that later commits will take advantage of) * cleanup can be done in bulk On the downside, there may be more fragmentation (wasted memory) due to per-regex MemoryContext objects. This is a problem shared with other cached objects in PostgreSQL and can probably be improved with later tuning. Thanks to Noah Misch for suggesting this general approach, which unblocks later work on interrupts. Suggested-by: Noah Misch <noah@leadboat.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CA%2BhUKGK3PGKwcKqzoosamn36YW-fsuTdOPPF1i_rtEO%3DnEYKSg%40mail.gmail.com
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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.