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Some variables are mostly read (mostly pointers) but they tend to be merged with other ones in the same cache line, slowing their access down in multi-thread setups. This patch declares an empty, aligned variable in a section called "read_mostly". This will force a cache-line alignment on this section so that any variable declared in it will be certain to avoid false sharing with other ones. The section will be eliminated at link time if not used. A __read_mostly attribute was added to compiler.h to ease use of this section.
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)