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bapt
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2017-12-06T10:01:02.163701Z
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MFC r325851:

remove the poor emulation of the IllumOS needfree global variable to prevent
the ARC reclaim thread running longer than needed.

Update the arc::needfree dtrace probe triggered in arc_lowmem() to also report
the value we may want to free.

Submitted by:	Nikita Kozlov <nikita.kozlov at blade-group.com>
Reviewed by:	avg
Approved by:	avg
Sponsored by:	blade
Differential Revision:	https://reviews.freebsd.org/D12163

END