#!@@GOODSH@@
#
# Plugin to monitor memory usage on FreeBSD.
#
# 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 vm.stats.vm.v_page_size > /dev/null; then
            echo yes
            exit 0
        else
            echo no
            exit 0
        fi
    else
        echo no
        exit 0
    fi
fi

PAGESIZE=$(/sbin/sysctl -n vm.stats.vm.v_page_size)
MEMSIZE=$(/sbin/sysctl -n vm.stats.vm.v_page_count)
MEMMAX=$(($PAGESIZE*$MEMSIZE))

if [ "$1" = "config" ]; then
    echo 'graph_args --base 1024 -l 0 --vertical-label Bytes --upper-limit' $MEMMAX
    echo 'graph_title Memory usage'
    echo 'graph_category system'
    echo 'graph_info This graph shows what the machine uses its memory for.'
    echo 'graph_order active inactive wired buffers cached free swap'
    echo 'active.label active'
    echo 'active.info pages recently statistically used'
    echo 'active.draw AREA'
    echo 'inactive.label inactive'
    echo 'inactive.info pages recently statistically unused'
    echo 'inactive.draw STACK'
    echo 'wired.label wired'
    echo 'wired.info pages that are fixed into memory, usually for kernel purposes, but also sometimes for special use in processes'
    echo 'wired.draw STACK'
    echo 'buffers.label buffers'
    echo 'buffers.info pages used for filesystem buffers'
    echo 'buffers.draw STACK'
    echo 'cached.label cache'
    echo 'cached.info pages that have percolated from inactive to a status where they maintain their data, but can often be immediately reused'
    echo 'cached.draw STACK'
    echo 'free.label free'
    echo 'free.info pages without data content'
    echo 'free.draw STACK'
    echo 'swap.label swap'
    echo 'swap.info Swap space used'
    echo 'swap.draw STACK'
    exit 0
fi

ACTIVE_COUNT=$(/sbin/sysctl -n vm.stats.vm.v_active_count)
INACTIVE_COUNT=$(/sbin/sysctl -n vm.stats.vm.v_inactive_count)
WIRED_COUNT=$(/sbin/sysctl -n vm.stats.vm.v_wire_count)
BUFFERS_COUNT=$(/sbin/sysctl -n vfs.bufspace)
CACHE_COUNT=$(/sbin/sysctl -n vm.stats.vm.v_cache_count)
FREE_COUNT=$(/sbin/sysctl -n vm.stats.vm.v_free_count)

echo active.value $(($ACTIVE_COUNT*$PAGESIZE))
echo inactive.value $(($INACTIVE_COUNT*$PAGESIZE))
echo wired.value $(($WIRED_COUNT*$PAGESIZE))
echo buffers.value $(($BUFFERS_COUNT))
echo cached.value $(($CACHE_COUNT*$PAGESIZE))
echo free.value $(($FREE_COUNT*$PAGESIZE))
echo swap.value $(swapinfo -k | awk '{sum += $3}; END {print sum * 1024}')
