mjg
b46ad9fa56
Implement unr64 ...
Important users of unr like tmpfs or pipes can get away with just
ever-increasing counters, making the overhead of managing the state
for 32 bit counters a pessimization.
Change it to an atomic variable. This can be further sped up by making
the counts variable "allocate" ranges and store them per-cpu.
Reviewed by: kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D18054
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b46ad9fa56