8d0ddccec6
On a 64-bit machine, if you set track_activity_query_size and max_connections such that their product exceeds 1GB, shared memory setup will still succeed (given enough RAM), but attempts to read pg_stat_activity fail with "invalid memory alloc request size". Work around that by using MemoryContextAllocHuge to allocate the local copy of the activity strings. Using the "huge" API costs us nothing extra in normal cases, and it seems better than throwing an error and/or explaining to people why they can't do this. This situation seems insanely profligate today, but who knows what people will consider normal in ten or twenty years? So let's fix it in HEAD but not worry about a back-patch. Per report from James Tomson. Discussion: https://postgr.es/m/1CFDCCD6-B268-48D8-85C8-400D2790B2C3@pushd.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/.