#!/usr/bin/sh
# -*- sh -*-

: << =cut

=head1 NAME

swap - Plugin to monitor swap IO in number of blocks per second

=head1 CONFIGURATION

No configuration

=head1 AUTHOR

Unknown author

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf

=cut

. "$MUNIN_LIBDIR/plugins/plugin.sh"

if [ "$1" = "autoconf" ]; then
	if [ -r /proc/stat ]; then
		echo yes
		exit 0
	else
		echo "no (no /proc/stat)"
		exit 0
	fi
fi

if [ "$1" = "config" ]; then

	echo 'graph_title Swap in/out'
	echo 'graph_args -l 0 --base 1000'
	# shellcheck disable=SC2016
	echo 'graph_vlabel pages per ${graph_period} in (-) / out (+)'
	echo 'graph_category system'
	echo 'swap_in.label swap'
	echo 'swap_in.type DERIVE'
	echo 'swap_in.max 100000'
	echo 'swap_in.min 0'
	echo 'swap_in.graph no'
	print_warning swap_in
	print_critical swap_in
	echo 'swap_out.label swap'
	echo 'swap_out.type DERIVE'
	echo 'swap_out.max 100000'
	echo 'swap_out.min 0'
	echo 'swap_out.negative swap_in'
	print_warning swap_out
	print_critical swap_out
	exit 0
fi

if [ -f /proc/vmstat ]; then
	awk '/pswpin/ { print "swap_in.value " $2 } /pswpout/ { print "swap_out.value " $2 }' < /proc/vmstat
else
	awk '/swap/ { print "swap_in.value " $2 "\nswap_out.value " $3 }' < /proc/stat
fi