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Arrange for postmaster child processes to respond to two environment variables, PG_OOM_ADJUST_FILE and PG_OOM_ADJUST_VALUE, to determine whether they reset their OOM score adjustments and if so to what. This is superior to the previous design involving #ifdef's in several ways. The behavior is now available in a default build, and both ends of the adjustment --- the original adjustment of the postmaster's level and the subsequent readjustment by child processes --- can now be controlled in one place, namely the postmaster launch script. So it's no longer necessary for the launch script to act on faith that the server was compiled with the appropriate options. In addition, if someone wants to use an OOM score other than zero for the child processes, that doesn't take a recompile anymore; and we no longer have to cater separately to the two different historical kernel APIs for this adjustment. Gurjeet Singh, somewhat revised by me |
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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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.