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HAProxy - Load balancer
2830d282e5
Instead of storing an index that's swapped at every call, let's use the two pointers as a shifting history. Now we have a permanent "caller" field that records the last caller, and an optional prev_caller in the debug section enabled by DEBUG_TASK that keeps a copy of the previous caller one. This way, not only it's much easier to follow what's happening during debugging, but it saves 8 bytes in the struct task in debug mode and still keeps it under 2 cache lines in nominal mode, and this will finally be usable everywhere and later in profiling. The caller_idx was also used as a hint that the entry was freed, in order to detect wakeup-after-free. This was changed by setting caller to -1 instead and preserving its value in caller[1]. Finally, the operations were made atomic. That's not critical but since it's used for debugging and race conditions represent a significant part of the issues in multi-threaded mode, it seems wise to at least eliminate some possible factors of faulty analysis. |
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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)