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|
#!/bin/sh
usage() {
echo "usage: nureadahead-collect DEVICE TIMEOUT > file" >&2
}
case "$1" in
-*) usage; exit 1
esac
case "$#" in
2) device=$1 timeout=$2;;
*) usage; exit 1
esac
awk_prog2='
$1 <= end && $2 > end {
end = $2
}
$1 > end && NR != 1 {
print start " " end
}
$1 > end {
start = $1
end = $2
}
END {
print start " " end
}
'
blktrace -a read -d "$1" -w "$timeout" -o - \
| blkparse -f "%a %d %e %n %S\n" -i - \
| awk '$1 == "C" && $2 ~ /R/ && $2 !~ /A/ && $3 == 0 { print $5 " " $5 + $4 - 1 }' \
| sort -n -k1,1 -k2,2 \
| awk "$awk_prog2"
|
