[size=4] I haven't had time (yet) to try automation, and using /proc/stats isn't so trivial to implement reliably no matter of conditions, so as for now, it depends on busybox-power /Estel
awk '{if ($3=="'"mmcblk1p2"'") print $10}' /proc/diskstats
swap=mmcblk1p2 awk '{if ($3=="'"$swap"'") print $10}' /proc/diskstats