Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

add a command to calculate the ratios of cnt_hold and cnt_lock to locks
from mutex profiling... This takes cnt_* and divides it by count, so
lower is better...

Sample command:
sh mtxpercent.sh | sort -rn +7 -8

SEE ALSO
MUTEX_PROFILING(9)

o the kernel sysctl uses 'avg' for a key; change to suit
o change header field widths to match the kernel so columns line up

Mutex statistics script.