monitor_pid.sh

#!/bin/bash
PID=$1

function log()
{
	echo $(date) $@
}

lastsize=0
lastresident=0
lastshare=0
lasttext=0
lastlib=0
lastdata=0
lastdt=0

while [ 1 ]; do
	# http://man7.org/linux/man-pages/man5/proc.5.html
	read size resident share text lib data dt <<< $(cat /proc/$PID/statm)

	if [[ $size -gt $lastsize ]]; then
		log "Size $lastsize -> $size"
	fi
	lastsize=$size

	if [[ $resident -gt $lastresident ]]; then
		log "Resident $lastresident -> $resident"
	fi
	lastresident=$resident

	if [[ $share -gt $lastshare ]]; then
		log "Share $lastshare -> $share"
	fi
	lastshare=$share

	if [[ $text -gt $lasttext ]]; then
		log "Text $lasttext -> $text"
	fi
	lasttext=$text

	if [[ $lib -gt $lastlib ]]; then
		log "Lib $lastlib -> $lib"
	fi
	lastlib=$lib

	if [[ $data -gt $lastdata ]]; then
		log "Data $lastdata -> $data"
	fi
	lastdata=$data

	if [[ $dt -gt $lastdt ]]; then
		log "Dt $lastdt -> $dt"
	fi
	lastdt=$dt

	sleep 1
done