K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2020-08-24T09:00:57.830118Z
K 7
svn:log
V 229
cache: lockless reverse lookup

This enables fully scalable operation for getcwd and significantly improves
realpath.

For example:
PATH_CUSTOM=/usr/src ./getcwd_processes -t 104
before:  1550851
after: 380135380

Tested by:	pho

END