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#!/bin/sh
VM="/proc/sys/vm"
[ -w $VM/laptop_mode -a -w $VM/dirty_ratio ] || exit $NA
# We might only want to enable laptop mode on actual laptops.
# It really depends on how green we want to try to make the Linux
# world.
laptop_mode_ac() {
# disable laptop mode, set vm parameters back to sane defaults
echo 0 >$VM/laptop_mode
echo 5 >$VM/dirty_background_ratio
echo 2999 >$VM/dirty_expire_centisecs
echo 10 >$VM/dirty_ratio
echo 499 >$VM/dirty_writeback_centisecs
}
laptop_mode_battery() {
# enable laptop mode, set vm parameters to buffer as many writes as
# possible.
echo 1 >$VM/laptop_mode
echo 1 >$VM/dirty_background_ratio
echo 60000 >$VM/dirty_expire_centisecs
echo 85 >$VM/dirty_ratio
echo 60000 >$VM/dirty_writeback_centisecs
}
case $1 in
true) laptop_mode_battery ;;
false) laptop_mode_ac ;;
*) exit $NA ;;
esac
exit 0
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