#! /bin/ksh
# Copyright (c) 2010, Wikimedia Deutschland
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the name of Wikimedia Deutschland nor the
#       names of its contributors may be used to endorse or promote products
#       derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY WIKIMEDIA DEUTSCHLAND ''AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL WIKIMEDIA DEUTSCHLAND BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# NOTE: This software is not released as a product. It was written primarily for
# Wikimedia Deutschland's own use, and is made public as is, in the hope it may
# be useful. Wikimedia Deutschland may at any time discontinue developing or
# supporting this software. There is no guarantee any new versions or even fixes
# for security issues will be released.
###
# Munin plugin to report Solaris memory usage via mdb's memstat.
# Must be run as root.
#
# river@tamara.tcx.org.uk 2010-08-28

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

if [ "$1" = "autoconf" ]; then
	if [ -e /usr/bin/mdb ]; then
		echo yes
	else
		echo /usr/bin/mdb not found
	fi
	exit 0
fi

if [ "$1" = "config" ]; then
	echo '
graph_args --base 1024 -l 0 --vertical-label Bytes
graph_title Memory usage
graph_category memory
graph_info This graph shows system memory use.
graph_order kernel anon exec cacheused zfs cachefree free

kernel.label kernel
kernel.draw AREA
kernel.info Memory used by kernel

anon.label anon
anon.draw STACK
anon.info Memory used by programs

exec.label exec_and_libs
exec.draw STACK
exec.info Memory used by executable files and libraries

cacheused.label cacheused
cacheused.draw STACK
cacheused.info Memory used by page cache

zfs.label zfs
zfs.draw STACK
zfs.info Memory used for ZFS file cache

cachefree.label cachefree
cachefree.draw STACK
cachefree.info Free memory in cache list

free.label free
free.draw STACK
free.info Free memory
'
	exit 0
fi

echo "::memstat" | mdb -k | nawk '
BEGIN {
	pagesize='"$(getconf PAGESIZE)"'
	kernel=0
	zfs=0
	anon=0
	exec=0
	cache=0
	phys=0
}

/^Kernel/		{ kernel=$2 }
/^ZFS File Data/	{ zfs=$4 }
/^Anon/			{ anon=$2 }
/^Exec and libs/	{ exec=$4 }
/^Page cache/ 		{ cacheused=$3 }
/^Free \(cachelist\)/	{ cachefree=$3 }
/^Free \(freelist\)/	{ free=$3 }

END {
	print "kernel.value " (kernel * pagesize)
	print "zfs.value " (zfs * pagesize)
	print "anon.value " (anon * pagesize)
	print "exec.value " (exec * pagesize)
	print "cacheused.value " (cacheused * pagesize)
	print "cachefree.value " (cachefree * pagesize)
	print "free.value " (free * pagesize)
}
'