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Previously we used a spinlock, in adition to the atomically manipulated ->state field, to protect the wait queue. But it's pretty simple to instead perform the locking using a flag in state. Due to 6150a1b0 BufferDescs, on platforms (like PPC) with > 1 byte spinlocks, increased their size above 64byte. As 64 bytes are the size we pad allocated BufferDescs to, this can increase false sharing; causing performance problems in turn. Together with the previous commit this reduces the size to <= 64 bytes on all common platforms. Author: Andres Freund Discussion: CAA4eK1+ZeB8PMwwktf+3bRS0Pt4Ux6Rs6Aom0uip8c6shJWmyg@mail.gmail.com 20160327121858.zrmrjegmji2ymnvr@alap3.anarazel.de
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/.