Kip Macy 285738b6ad - reduce contention by breaking up ARC state locks in to 16 for data
and 16 for metadata
- export L2ARC tunables as sysctls
- add several kstats to track L2ARC state more precisely
- avoid holding a contended lock when atomically incrementing a
  contended counter (no lock protection needed for atomics)
2010-03-16 22:17:21 +00:00
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