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8d8747abe0
Currently we have per-thread arrays of trees and counts, but these ones unfortunately share cache lines and are accessed very often. This patch moves the task-specific stuff into a structure taking a multiple of a cache line, and has one such per thread. Just doing this has reduced the cache miss ratio from 19.2% to 18.7% and increased the 12-thread test performance by 3%. It starts to become visible that we really need a process-wide per-thread storage area that would cover more than just these parts of the tasks. The code was arranged so that it's easy to move the pieces elsewhere if needed.