#!/bin/sh
# Kernel Memory usage stats.
# Author: alex@trull.org
#
# Based on the short script at http://wiki.freebsd.org/ZFSTuningGuide (20080820)
#
# Parameters:
#
# 	config   (required)
# 	autoconf (optional - only used by munin-config)
#
# Magic markers (optional - only used by munin-config and some
# installation scripts):
#%# family=auto
#%# capabilities=autoconf

if [ "$1" = "autoconf" ]; then
    if [ -x /sbin/sysctl ]; then
        if /sbin/sysctl vm.kmem_size_max >/dev/null 2>&1; then
            echo "yes"
        else
            echo "no (missing sysctl variable 'vm.kmem_size_max')"
        fi
    else
        echo "no (missing 'sysctl' executable)"
    fi
    exit 0
fi

TEXT=`kldstat | tr a-f A-F | awk 'BEGIN {print "ibase=16"}; NR > 1 {print $4}' | bc | awk '{a+=$1}; END {print a}'`
DATA=`vmstat -m | sed 's/K//' | awk '{a+=$3}; END {print a*1024}'`
TOTAL=`echo $DATA $TEXT | awk '{print $1+$2}'`
MAX=`sysctl vm.kmem_size_max | awk '{print $2}'`

if [ "$1" = "config" ]; then
        echo 'graph_args --base 1024 -l 0 --vertical-label Bytes'
	echo 'graph_title Kernel Memory usage'
	echo 'graph_category system'
	echo 'graph_info This graph shows kmem usage.'
	echo 'graph_order text data'
	echo 'text.label text'
	echo 'text.info kmem text'
	echo 'text.draw AREA'
        echo 'data.label data'
        echo 'data.info kmem data'
        echo 'data.draw STACK'
        echo 'total.label total'
        echo 'total.info kmem total'
        echo 'total.draw LINE'
        echo 'max.label max'
        echo 'max.info kmem max'
        echo 'max.draw LINE2'
	exit 0
fi

echo "text.value $TEXT"
echo "data.value $DATA"
echo "total.value $TOTAL"
echo "max.value $MAX"