Jeff Roberson ad5b0f5b51 Fix arc after r326347 broke various memory limit queries. Use UMA features
rather than kmem arena size to determine available memory.

Initialize the UMA limit to LONG_MAX to avoid spurious wakeups on boot before
the real limit is set.

PR:		224330 (partial), 224080
Reviewed by:	markj, avg
Sponsored by:	Netflix / Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D13494
2018-01-02 04:35:56 +00:00
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