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8d3c3336f9
stream_store_counters() calls stksess_kill_if_expired() for each active counter. And this one takes an exclusive lock on the table before checking if it has any work to do (hint: it almost never has since it only wants to delete expired entries). However a lock is still neeed for now to protect the ref_cnt, but we can do it atomically under the read lock. Let's change the mechanism. Now what we do is to check out of the lock if the entry is expired. If it is, we take the write lock, expire it, and decrement the refcount. Otherwise we just decrement the refcount under a read lock. With this change alone, the config based on 3 trackers without the previous patches saw a 2.6x improvement, but here it doesn't yet change anything because some heavy contention remains on the lookup part.
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)