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Our testing showed that this is helpful at sufficiently high contention levels and doesn't hurt performance on smaller machines. The new TAS_SPIN macro for AArch64 is identical to the ones added for PPC and x86_64 (see commitsbc2a050d40andb03d196be0). Back-patch of commit3d0b4b1068, which first shipped in v18. Salvatore Dipietro reports that this change is beneficial on newer Linux kernels, and the original commit has aged long enough to provide some confidence that it won't cause problems. v14 is left alone since it lacks commita82a5eee31and will soon be out of support. Reported-by: Salvatore Dipietro <dipiets@amazon.it> Reviewed-by: Jingtang Zhang <mrdrivingduck@gmail.com> Reviewed-by: Andres Freund <andres@anarazel.de> Tested-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/ZxgDEb_VpWyNZKB_%40nathan Discussion: https://postgr.es/m/20260915114623.431827-1-dipiets%40amazon.it Backpatch-through: 15
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/.