#! /bin/sh

PATH=/sbin:/bin

SWAPPINESS=0
# Max time to wait for writeout
MAX_AGE=120
WCENT_AGE=$((100 * $MAX_AGE))
ECENT_AGE=$((100 * $MAX_AGE))
# Max percent of mem to use for dirty pages
DRATIO=10
# Once we write, do so until this many percent of mem is still in use
DBRATIO=1

##default-values
SWAPPINESS_D=60
MAX_AGE_D=0
WCENT_AGE_D=500
ECENT_AGE_D=3000
DRATIO_D=10
DBRATIO_D=5

case "$1" in
   start)
         echo -n $SWAPPINESS   >> /proc/sys/vm/swappiness
         echo -n $MAX_AGE      >> /proc/sys/vm/laptop_mode
         echo -n $WCENT_AGE    >> /proc/sys/vm/dirty_writeback_centisecs
         echo -n $ECENT_AGE    >> /proc/sys/vm/dirty_expire_centisecs
         echo -n $DRATIO       >> /proc/sys/vm/dirty_ratio
         echo -n $DBRATIO      >> /proc/sys/vm/dirty_background_ratio
         ;;
   restart|reload|force-reload)
         echo "Error: argument '$1' not supported" >&2
         exit 3
         ;;
   stop)
         echo -n $SWAPPINESS_D >> /proc/sys/vm/swappiness
         echo -n $MAX_AGE_D    >> /proc/sys/vm/laptop_mode
         echo -n $WCENT_AGE_D  >> /proc/sys/vm/dirty_writeback_centisecs
         echo -n $ECENT_AGE_D  >> /proc/sys/vm/dirty_expire_centisecs
         echo -n $DRATIO_D     >> /proc/sys/vm/dirty_ratio
         echo -n $DBRATIO_D    >> /proc/sys/vm/dirty_background_ratio
         ;;
   *)
         echo "Usage: $0 start|stop" >&2
         exit 3
         ;;
esac
exit 0