#!/bin/sh
#
# Script to monitor CPU usage of Xen domains
#
# Parameters understood:
#
#     conifg    (required)
#     autoconf  (optinal - used by munin-config)
#

MAXDOMAINS=16

if [ "$1" = "autoconf" ]; then
        if which xm > /dev/null ; then
                echo yes
                exit 0
        fi
        echo "no (xm not found)"
        exit 1
fi

if [ "$1" = "config" ]; then
        echo 'graph_title Xen Domain CPU Usage'
        echo 'graph_args --base 1000 -l 0'
        echo 'graph_scale no'
	echo 'graph_vlabel Percentage of real CPU time'
        echo 'graph_category xen'
        echo 'graph_info This graph shows the average CPU percentage used by each domain'
        xm list | tail -n +2 | \
        while read name domid mem cpu state time; do
                name=`echo $name | sed -e"s/[-\.]/_/g"`
                echo "$name.label $name"
                echo "$name.type DERIVE"
               if [ "$name" = "Domain_0" ]; then
                       echo "$name.draw AREA"
               else
                       echo "$name.draw STACK"
               fi
                echo "$name.min 0"
                echo "$name.info Percentage of CPU usage for $name"
        done
        exit 0
fi

xm list | tail -n +2 | \
while read name domid mem cpu state time; do
        name=`echo $name | sed -e"s/[-\.]/_/g"`
	# This will extract execution time in deciseconds.
        time=`echo $time | sed -e "s/\.//"`
	# Here we make a guess. Since execution time is normalized on a per-second basis, if a
	# domain reaches 1 second of normalized execution time, it is using 100% CPU-time for one CPU.
	# So, being our value in deciseconds, we multiply it by 10 to obtain a percentage (or 1/100 seconds)
	time=$(($time*10))
        echo "$name.value $time"
done