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The lock was still used exclusively to deal with the concurrency between the "show sess" release handler and a stream_new() or stream_free() on another thread. All other accesses made by "show sess" are already done under thread isolation. The release handler only requires to unlink its node when stopping in the middle of a dump (error, timeout etc). Let's just isolate the thread to deal with this case so that it's compatible with the dump conditions, and remove all remaining locking on the streams. This effectively kills the streams lock. The measured gain here is around 1.6% with 4 threads (374krps -> 380k).
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)