a script to get mem usage based on both smaps and statm

linuxmem.sh

#!/bin/sh
sum_smap_rs_pd() {
        awk '/^Private_Dirty:/ { p += $2 }
        /^Rss:/ { s += $2 }
END { print s,p }' /proc/$1/smaps 2> /dev/null
}

sum_statm_rs_data() {
        awk '{ print $2*4,$6*4 }' /proc/$1/statm 2> /dev/null
}

stats() {
        smap=$(sum_smap_rs_pd $1)
        statm=$(sum_statm_rs_data $1)
        name=$(cat /proc/$1/comm | tr ' ' '_') 2> /dev/null
        if [ X$name = X ]; then
                name=unknown
                smap="0 0"
                statm="0 0"
        fi
        line=$(printf "%d\t%20s%12s%12d%12d%12d\n" $1 "$name" $smap $statm)
        if [ $? -ne 0 ]; then
                cat /proc/$1/smaps
                cat /proc/$1/statm
                exit 1
        fi
        echo "$line" | (read id n a b c d 
        if [ $b -gt $d ]]; then echo "$line" "dirty private pages > data"; else echo "$line"; fi
        )
}
printf "%s\t%20s%12s%12s%12s%12s\n" id name smap_rs smap_pd statm_rs statm_data
if [ X$1 = "X" ]; then
for i in $(ps --no-headers -Ao pid)
do
        stats $i
done
else
        stats $1
fi