MUTEX_PROFILING has been generalized to LOCK_PROFILING. We now profile

wait (time waited to acquire) and hold times for *all* kernel locks. If
the architecture has a system synchronized TSC, the profiling code will
use that - thereby minimizing profiling overhead. Large chunks of profiling
code have been moved out of line, the overhead measured on the T1 for when
it is compiled in but not enabled is < 1%.

Approved by: scottl (standing in for mentor rwatson)
Reviewed by: des and jhb

1 files changed, 6 insertions, 0 deletions

diff --git a/UPDATING b/UPDATING
index 13c6c68..428234b 100644
--- a/UPDATING
+++ b/UPDATING
@@ -20,6 +20,12 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 7.x IS SLOW:
 	in userland, and various verbose features in the kernel.  Many
 	developers choose to disable these features on build machines
 	to maximize performance.
+20061110:
+	The MUTEX_PROFILING option has been renamed to LOCK_PROFILING.
+	The lockmgr object layout has been changed as a result of having
+	a lock_object embedded in it. As a consequence all file system
+	kernel modules must be re-compiled. The mutex profiling man page 
+	has not yet been updated to reflect this change.
 
 20061026:
 	KSE in the kernel has now been made optional and turned on by