mjg 1851883043 vm: stop taking proc lock in mmap to satisfy racct if it is disabled
Limits can be safely obtained with lim_cur from the thread. racct is compiled
in but disabled by default. Note that racct enablement is a boot-only tunable.

This eliminates second most common place of taking the lock while pkg building.

While here don't take the lock in mlockall either.

Reviewed by:	kib
Approved by:	re (gjb)
Differential Revision:	https://reviews.freebsd.org/D17210
2018-09-18 01:24:30 +00:00
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