# iterate over /proc/PID entries and find out Rss and Swap values, run as:
# ./checkswap | sort -nr > checkswap.out

for pid in `find /proc -type d -maxdepth 1`; do
 fn="$pid/smaps"
 if [ -f "$fn" ]; then
  nam=`cat $pid/cmdline`
  sumT=0; for each in `grep Rss $fn | sed -n 's/^Rss:\s*\(\S*\)\s*kB$/\1/p'`;\
   do sumT=$(( $sumT + $each )); done
  sumS=0; for each in `grep Swap $fn | sed -n 's/^Swap:\s*\(\S*\)\s*kB$/\1/p'`;\
   do sumS=$(( $sumS + $each )); done
  echo "$sumT<->$sumS<->$nam ($pid)"
 fi
done