K 10
svn:author
V 5
mmacy
K 8
svn:date
V 27
2018-10-05T05:50:56.573005Z
K 7
svn:log
V 517
eliminate locking surrounding ui_vmsize and swap reserve by using atomics

Change swap_reserve and swap_total to be in units of pages so that
swap reservations can be done using only atomics instead of using a single
global mutex for swap_reserve and a single mutex for all processes running
under the same uid for uid accounting.

Results in mmap speed up and a 70% increase in brk calls / second.

Reviewed by:	alc@, markj@, kib@
Approved by:	re (delphij@)
Differential Revision:	https://reviews.freebsd.org/D16273

END