さくっとプロセスの Rss と Shared_Clean + Shared_Dirty のサイズを計算

echo $(( $(cat /proc/6941/smaps | grep ^Rss | awk '{print $2 "+"}') 0 ))
echo $(( $(cat /proc/6941/smaps | grep ^Shared | awk '{print $2 "+"}') 0 ))

ついでに、まとめて Rss と Shared_Clean + Shared_Dirty とその比率を出力。

for pid in $(pgrep http); do
    rss=$(( $(cat "/proc/$pid/smaps" | grep ^Rss | awk '{print $2 "+"}') 0 ))
    shared=$(( $(cat "/proc/$pid/smaps" | grep ^Shared | awk '{print $2 "+"}') 0 ))
    name=$(cat "/proc/$pid/cmdline" | tr '\0' ' ')
    printf "%d\t%d\t%d\t%d%%\t%s\n" "$pid" "$rss" "$shared" "$(($shared*100/$rss))" "$name"
done

次のように結果が表示される。

6932    455596  444156  97%     /usr/sbin/httpd 
6933    455964  444164  97%     /usr/sbin/httpd 
6935    455308  444228  97%     /usr/sbin/httpd 
6939    455812  444184  97%     /usr/sbin/httpd 
6940    455968  444176  97%     /usr/sbin/httpd 
6941    455968  444228  97%     /usr/sbin/httpd 
6942    455960  444192  97%     /usr/sbin/httpd 
6943    455756  444180  97%     /usr/sbin/httpd 
8092    455960  444184  97%     /usr/sbin/httpd 
13370   451436  445800  98%     /usr/sbin/httpd 
24533   455964  444292  97%     /usr/sbin/httpd