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14 - A secondary small hash table of locks is used to lock an item by its hash
17 - This secondary hash table is mapped to the central hash tables buckets. This
18   allows multiple threads to access the hash table in parallel. Only one
20 - atomic refcounts per item are used to manage garbage collection and
24   system must attempt to lock the item's bucket, which is done with a trylock
25   to avoid deadlocks. If a bucket is in use (and not by that thread) it will
26   walk up the LRU a little in an attempt to fetch a non-busy item.
30 - Raw accesses to the slab class are protected by a global slabs_lock. This
48 Various locks exist for background threads. They can be used to pause the
56 - In my testing, the remaining global STATS_LOCK calls never seem to collide.
58 Yes, more stats can be moved to threads, and those locks can actually be