#! /bin/sh
#
# Plugin to monitor swap usage.
#
# 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 hw.pagesize > /dev/null 2>&1; then
	    	echo yes
    		exit 0
    	else
	        echo no
		exit 1
	fi
    else
        echo no
        exit 1
    fi
fi

PAGESIZE=`/sbin/sysctl -n hw.pagesize`

if [ "$1" = "config" ]; then
        echo 'graph_args --base 1024 -l 0 --vertical-label Bytes'
	echo 'graph_title Swap usage'
	echo 'graph_category system'
	echo 'graph_info This graph shows how the machine uses its swap.'

	echo 'graph_order size used'

	echo 'size.label swap size'
	echo 'size.draw AREA'

	echo 'used.label swap used'
	echo 'used.draw AREA'

	exit 0
fi

vmstat -s | awk -v bpp=$PAGESIZE '
/swap pages in use$/	{ print "used.value "     $1 * bpp; }
/swap pages$/		{ print "size.value "     $1 * bpp; }
'