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Due to the way the wait queue works, some tasks might be postponed but not requeued. However when we exit wake_expired_tasks() on a not-yet-expired task and leave it in this situation, the next call to next_timer_expiry() will use this first task's key in the tree as an expiration date, but this date might be totally off and cause needless wakeups just to reposition it. This patch makes sure that we leave wake_expired_tasks with a clean state of frontside tasks and that their tree's key matches their expiration date. Doing so we can already observe a ~15% reduction of the number of wakeups when dealing with large numbers of health checks. The patch looks large because the code was rearranged but the real change is to take the wakeup/requeue decision on the task's expiration date instead of the tree node's key, the rest is unchanged.
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)