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9f3129e583
Initially per-thread pool caches were stored into a fixed-size array. But this was a bit ugly because the last allocated pools were not able to benefit from the cache at all. As a work around to preserve performance, a size of 64 cacheable pools was set by default (there are 51 pools at the moment, excluding any addon and debugging code), so all in-tree pools were covered, at the expense of higher memory usage. In addition an index had to be calculated for each pool, and was used to acces the pool cache head into that array. The pool index was not even stored into the pools so it was required to determine it to access the cache when the pool was already known. This patch changes this by moving the pool cache head into the pool head itself. This way it is certain that each pool will have its own cache. This removes the need for index calculation. The pool cache head is 32 bytes long so it was aligned to 64B to avoid false sharing between threads. The extra cost is not huge (~2kB more per pool than before), and we'll make better use of that space soon. The pool cache head contains the size, which should probably be removed since it's already in the pool's head.