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When calling mmap(), in general the system gives us a page but does not really allocate it until we first dereference it. And it turns out that this time is much longer than the time to perform the mmap() syscall. Unfortunately, when running with memory debugging enabled, we mmap/munmap() each object resulting in lots of such calls and a high contention on the allocator. And the first accesses to the page being done under the pool lock is extremely damaging to other threads. The simple fact of writing a 0 at the beginning of the page after allocating it and placing the POOL_LINK pointer outside of the lock is enough to boost the performance by 8x in debug mode and to save the watchdog from triggering on lock contention. This is what this patch does.
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)