#!/usr/bin/awk -f
#
# vmblance	Awk script to detect endless growing memory alloctions
#		in endless shell loops using in daemonized shell scripts
#
# Usage:
#
#   strace -s 128 -e execve,mmap,mmap2,munmap -o '|./vmbalance' ksh leak1.sh
#
BEGIN {
    FS="([[:blank:]]|[[:punct:]])"
    ignore=""
    script=""
    sum=0
    allocs=0
    frees=0
    left=0
    peak=0
}
/^execve/ {
    if (FNR == 1) {
	script = gensub(/.*SOURCES\/([[:alnum:]_-]+\.sh).*/, "\\1", "g", $0)
    }
}
/^mmap(2|64)?\(/ {
    if ($0 !~ /.*MAP_PRIVATE\|MAP_ANONYMOUS.*/) {
	if (ignore)
 	    ignore=ignore "|" $NF
	else
 	    ignore=$NF
    } else {
	sum+=$4
	allocs++
	if (peak < sum)
	    peak = sum
    }
}
/^munmap(2|64)?\(/ {
    if ($0 !~ ignore) {
   	sum-=$4
	frees++
    }
}
END {
    left=allocs-frees
    print script ": " sum " bytes summed up, " peak " peak value, " left " chunks left over, " allocs " allocated, and " frees " freed" > "/dev/fd/3"
}