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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
The PostgreSQL contrib tree
---------------------------
This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree. This does not preclude their
usefulness.
User documentation for each module appears in the main SGML
documentation.
When building from the source distribution, these modules are not
built automatically, unless you build the "world" target. You can
also build and install them all by running "make all" and "make
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.
Some directories supply new user-defined functions, operators, or
types. To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command. In a fresh database,
you can simply do
CREATE EXTENSION module_name;
See the PostgreSQL documentation for more information about this
procedure.