If we need swap space, but don't want it to always hit the same part of the SSD, we should be able to use a swap file in /tmp, allocating 2GB at boot. At least in Ubuntu, /tmp is cleaned up each boot, so when we create our swap file, trim has the opportunity to put the file on some fresh SSD sectors.
Here's the init script for this:
#!/bin/sh
#
# setup swap file init script
#
### BEGIN INIT INFO
# Provides: atop
# Required-Start: $syslog
# Required-Stop: $syslog
# Should-Start: $local_fs
# Should-Stop: $local_fs
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Monitor for system resources and process activity
# Description: Atop is an ASCII full-screen performance monitor,
# similar to the top command, but atop only shows
# the active system-resources and processes, and
# only shows the deviations since the previous
# interval.
### END INIT INFO
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
SWAPFILE=/tmp/swapfile
NAME=init_swap.sh
DESC="tmp swapfile creator"
case "$1" in
start)
echo -n "Starting $DESC: "
if $0 status >/dev/null
then
echo " Already Running."
exit 0
fi
test -f ${SWAPFILE} && rm ${SWAPFILE}
dd if=/dev/zero of=${SWAPFILE} bs=1M count=2048
mkswap ${SWAPFILE}
swapon ${SWAPFILE}
echo " Done."
;;
stop)
echo -n "Stopping $DESC: "
$0 status >/dev/null && swapoff ${SWAPFILE}
test -f ${SWAPFILE} && rm ${SWAPFILE}
echo " Done."
exit 0
;;
status)
if swapon -s | grep -q ^/tmp/swapfile
then
echo "Swap is enabled"
exit 0
else
echo "Swap is not enabled"
exit 1
fi
;;
*)
N=/etc/init.d/$NAME
echo "Usage: $N {start|status}" >&2
exit 1
;;
esac
exit 0
