Mark Johnston efe8b26b82 Modify lockstat_nsecs() to just return unless lockstat probes are actually ...

enabled. The cost of a timecounter read can be quite significant, and the
problem became more apparent after r284297, since that change resulted in
a call to lockstat_nsecs() for each acquisition of an rwlock read lock.

PR:		201642
Reviewed by:	avg
Tested by:	Jason Unovitch
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D3073

2015-07-18 00:22:00 +00:00

..

boot/zfs

MFV r274273:

2014-11-10 08:20:21 +00:00

compat/opensolaris

Create a dedicated function for ensuring that cdir and rdir are populated.

2015-07-11 16:22:48 +00:00

contrib/opensolaris

vfs: implement v_holdcnt/v_usecount manipulation using atomic ops

2015-07-16 13:57:05 +00:00

dev

Modify lockstat_nsecs() to just return unless lockstat probes are actually

2015-07-18 00:22:00 +00:00