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a22550fbd7
In addition to the total/average wait time, we now also store the wait time in 2^N buckets. There are 32 buckets for each type (read, seek, write), allowing to store wait times from 1-2ns to 2.1-4.3s, which is quite sufficient, even if we'd want to switch from NS to CPU cycles in the future. The counters are only reported for non- zero buckets so as not to visually pollute the output. This significantly inflates the lock_stat struct, which is now aligned to 256 bytes and rounded up to 1kB. But that's not really a problem, given that there's only one per lock label.