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1534531fe7
Up to now, if you resized a large (>8K) palloc chunk down to a smaller size, aset.c made no attempt to return any space to the malloc pool. That's unpleasant if a really large allocation is resized to a significantly smaller size. I think no such cases existed when this code was designed, and I'm not sure whether they're common even yet, but an upcoming fix to encoding conversion will certainly create such cases. Therefore, fix AllocSetRealloc so that it gives realloc() a chance to do something with the block. This doesn't noticeably increase complexity, we mostly just have to change the order in which the cases are considered. Back-patch to all supported branches. Discussion: https://postgr.es/m/20190816181418.GA898@alvherre.pgsql Discussion: https://postgr.es/m/3614.1569359690@sss.pgh.pa.us |
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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/.