Hi Mike, This already integrated in Nevada:
6510807 ARC statistics should be exported via kstat
kstat zfs:0:arcstats
module: zfs instance: 0
name: arcstats class: misc
c 534457344
c_max 16028893184
c_min 534457344
crtime 6301.4284957
deleted 1149800
demand_data_hits 4514722
demand_data_misses 54810
demand_metadata_hits 289342
demand_metadata_misses 5203
evict_skip 0
hash_chain_max 8
hash_chains 8192
hash_collisions 1243605
hash_elements 53250
hash_elements_max 250443
hits 9929297
mfu_ghost_hits 3917
mfu_hits 2496914
misses 60013
mru_ghost_hits 29072
mru_hits 2596064
mutex_miss 4791
p 210483584
prefetch_data_hits 5125227
prefetch_data_misses 0
prefetch_metadata_hits 6
prefetch_metadata_misses 0
recycle_miss 2338
size 439890944
snaptime 939404.5920782
-r
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