Implement aggregate sum and use for arc counters
|Assignee:||Prakash Surya||% Done:|
|Category:||zfs - Zettabyte File System|
In pursuit of improving performance on multi-core systems, we should
implements fanned out counters and use them to improve the performance of
some of the arc statistics. These stats are updated extremely frequently,
and can consume a significant amount of CPU time.
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