script for watching kvm_stat

script for watching kvm_stat

[Christian Ehrhardt]

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I added the kvm_stat support to ppc to watch my guest while executing e.g. to check things like "what does my guest do when I see nothing" ;-)
To be able to do that I also needed a script that reports in a iostat/vmstat like style, because of that I wrote a small shell script.
Additionally my colleague Christian Bornträger had the need for a top style output and wrote a script for that need.
I attached both to help everyone experimenting with kvm_stat.

They are just small helpers and might still contain issues, feel free to comment, correct, whatever ;-)

-- 

Grüsse / regards, 
Christian Ehrhardt
IBM Linux Technology Center, Open Virtualization

[-- Attachment #2: kvmstat --]
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#!/bin/bash

kvmstatdir="/sys/kernel/debug/kvm"
duration=2
summode="no"
lph=20
line=-1
if [ $summode = "no" ]
then
	declare -a values
	counter=0
	for i in `ls $kvmstatdir`
	do
		values[$counter]=0
		counter=`expr $counter + 1`
	done
fi

kvmstat_header() {
	for i in `ls $kvmstatdir`
	do
		printf "|%16s " $i
	done
	printf "|\n"
}

USAGE="Usage: `basename $0` [-d arg] [-l arg] [-hs]"
while getopts hvsd:l: OPT; do
    case "$OPT" in
	h)	echo $USAGE
		echo "d - sleep between reported lines"
		echo "l - number of lines betweeen headers"
		echo "s - summary mode (default is difference since last print)"
		exit 0
		;;
	v)	echo "`basename $0` version 0.1"
		exit 0
		;;
	d)	duration=$OPTARG
		;;
	l)	lph=$OPTARG
		;;
	s)	summode="yes"
		;;
	\?)	# getopts issues an error message
		echo $USAGE >&2
		exit 1
		;;
    esac
done

while true
do
	line=`expr $line + 1`
	line=`expr $line % $lph`
	if [ $line -eq "0" ]
	then
		kvmstat_header
	fi

	counter=0
	for i in `ls $kvmstatdir`
	do
		val=`cat $kvmstatdir/$i`
		if [ $summode = "no" ]
		then
			cval=$val;
			val=`expr $cval - ${values[$counter]}`
			values[$counter]=$cval
			counter=`expr $counter + 1`	
		fi
        	printf "|%16d " $val
	done
	printf "|\n"

	sleep $duration
done

[-- Attachment #3: kvmtop --]
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#!/bin/bash
watch --differences -n 1 " kvmtop_once | sort -n -r"

[-- Attachment #4: kvmtop_once --]
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#!/bin/bash
cd /sys/kernel/debug/kvm
for d in *
do
cat $d | tr -d \\n
echo -e :\\t $d

done

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Re: script for watching kvm_stat

[Avi Kivity]

Christian Ehrhardt wrote:
> I added the kvm_stat support to ppc to watch my guest while executing 
> e.g. to check things like "what does my guest do when I see nothing" ;-)
> To be able to do that I also needed a script that reports in a 
> iostat/vmstat like style, because of that I wrote a small shell script.
> Additionally my colleague Christian Bornträger had the need for a top 
> style output and wrote a script for that need.
> I attached both to help everyone experimenting with kvm_stat.
>
> They are just small helpers and might still contain issues, feel free 
> to comment, correct, whatever ;-)

Are you aware of the kvm_stat python script in kvm-userspace.git?

-- 
error compiling committee.c: too many arguments to function


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