K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2015-04-01T08:25:40.438737Z
K 7
svn:log
V 534
Refine r280308.  Do not completely disable timestamping of devfs nodes
on reads or writes, the time marks are used to display idle time by
w(1) [1].  Instead, use vfs.devfs.dotimes as the selector of default
precision vs. using time_second.  The later gives seconds precision,
which is good enough for the purpose.

Note that timestamp updates are unlocked and the updates itself, as
well as the check in devfs_timestamp, are non-atomic.

Noted by:	truckman [1]
Reviewed by:	bde
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

END