#!/bin/sh

#
# You need to make sure kernel profiling in enabled by adding 
# following line to kernel configuartion and rebuilding the kernel
# and modules:
#
# options		LOCK_PROFILING
#

OUTFILE=`mktemp -t kernlock`

if [ $# -lt 1 ]; then
	echo "Syntax: $0 [ wait_seconds ]"
	exit 1
fi

WAITTIME=${1}

get_prof()
{
	sysctl -q debug.lock.prof.reset=1
	sysctl -q debug.lock.prof.enable=1
	echo "Profiling lock information for ${WAITTIME} seconds..."
	sleep ${WAITTIME}
	sysctl -q debug.lock.prof.enable=0
	sysctl debug.lock.prof.stats > ${OUTFILE}
}

show_prof()
{
	{
		head -2 ${OUTFILE} 
		cat ${OUTFILE} | sort -rn -k4 
	} | ${PAGER}
}

get_prof
show_prof
echo "Raw output save to ${OUTFILE}"