02a9923034
Mutexes in I/O path there were used twice per I/O to atomically access several variables to close and/or destroy the device on last request completion. I found the way to fit all required info into one integer, suitable for atomic operations. It opened race window on device close, but addition of timeout to the msleep() there should cover it. Profiling shows removal of significant spinning time on those mutexes and IOPS increase from ~600K to >800K to NVMe on 72-core systems. MFC after: 1 month Sponsored by: iXsystems, Inc.
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