show PID:(Shared Ratio) Shared_* kB / RSS kB on each child process

procshared.sh

#!/bin/bash

if [ "`whoami`" != "root" ];then
  echo "ERROR: must run as root"
  exit 1
fi

TARGET_PPID=$1
if [ "${TARGET_PPID}x" == "x" ]; then
  echo "Usage: $0 <TARGET_PPID>"
  exit 1
fi

TARGET_PIDS=$(pgrep -P ${TARGET_PPID:?})
if [ "${TARGET_PIDS}x" == "x" ]; then
  echo "ERROR: no child found!"
  echo "Usage: $0 <TARGET_PPID>"
  exit 1
fi

echo "PID:(Shared Ratio) Shared_* kB/ RSS kB"
echo "------------------------------------------"

shared_mem_all=0
rss_mem_all=0
for TARGET_PID in ${TARGET_PIDS:?}
do
  shared_mem_total=0
  for shared_mem in `egrep '^Shared_(Clean|Dirty):' /proc/${TARGET_PID:?}/smaps | awk '{print $2}'`
  do
    shared_mem_total=$(($shared_mem_total + $shared_mem))
  done

  rss_mem_total=0
  for rss_mem in `egrep '^Rss:' /proc/${TARGET_PID:?}/smaps | awk '{print $2}'`
  do
    rss_mem_total=$(($rss_mem_total + $rss_mem))
  done

  shared_ratio=$((100 * $shared_mem_total / $rss_mem_total))
  echo "${TARGET_PID:?}:(${shared_ratio}%) ${shared_mem_total} kB / ${rss_mem_total} kB"

  shared_mem_all=$(($shared_mem_all + $shared_mem_total))
  rss_mem_all=$(($rss_mem_all + $rss_mem_total))
done

echo "------------------------------------------"
shared_ratio_all=$((100 * $shared_mem_all / $rss_mem_all))
echo "avg:${shared_ratio_all}%, total:${shared_mem_all} kB / ${rss_mem_all} kB"