Hi,
Just in case people worry what I meant by solution 2, here is a script I
propose to replace laptop-mode.
If you are lokking for a quick fix to the situation such as SDD+laptop
as user, drop this into /etc/pm/power.d/ directory with
"-rwxr-xr-x 1 root root".
Regards,
Osamu
#!/bin/sh
# This can be editted and dropped into /etc/pm/power.d/laptop-mode
# to override the system script /usr/lib/pm-utils/power.d/laptop-mode .
. "${PM_FUNCTIONS}"
VM="/proc/sys/vm"
vmfiles="laptop_mode dirty_ratio dirty_background_ratio
dirty_writeback_centisecs"
# Do not use /etc/sysctrl.conf to set
# vm.laptop_mode
# vm.dirty_ratio
# vm.dirty_background_ratio
# vm.dirty_writeback_centisecs
# set default timings for AC operation = kernel default
LAPTOP_AC_MODE=${LAPTOP_AC_MODE:-0}
LAPTOP_AC_DIRTY_RATIO=${LAPTOP_AC_DIRTY_RATIO:-10}
LAPTOP_AC_DIRTY_BG_RATIO=${LAPTOP_AC_DIRTY_BG_RATIO:-5}
LAPTOP_AC_DIRTY_WRITEBACK=${LAPTOP_AC_DIRTY_WRITEBACK:-500}
# set default timings for battery operation
LAPTOP_BT_MODE=${LAPTOP_BT_MODE:-5}
LAPTOP_BT_DIRTY_RATIO=${LAPTOP_BT_DIRTY_RATIO:-60}
LAPTOP_BT_DIRTY_BG_RATIO=${LAPTOP_BT_DIRTY_BG_RATIO:-40}
LAPTOP_BT_DIRTY_WRITEBACK=${LAPTOP_BT_DIRTY_WRITEBACK:-60000}
# set default harddisk for SSD detection
MAIN_HDD=${MAIN_HDD:-sda}
# override default timings for AC operation for Laptop + SSD
if [ -d /sys/class/power_supply ] && \
grep -q Battery /sys/class/power_supply/*/type 2>/dev/null && \
[ "$(cat /sys/block/${MAIN_HDD}/queue/rotational)" = "0" ]; then
# This system has battery and SSD
LAPTOP_AC_MODE=$LAPTOP_BT_MODE
LAPTOP_AC_DIRTY_RATIO=$LAPTOP_BT_DIRTY_RATIO
LAPTOP_AC_DIRTY_BG_RATIO=$LAPTOP_BT_DIRTY_BG_RATIO
LAPTOP_AC_DIRTY_WRITEBACK=$LAPTOP_BT_DIRTY_WRITEBACK
fi
help() {
cat <<EOF
--------
$0: Laptop mode tuning parameters.
This hook controls how agressive the system is at trying to avoid
writing to disk depending on AC power or on battery.
The longer the disk is idle, the more power you can save while on battery.
It has 8 tuneable parameters:
LAPTOP_BT_MODE = value for laptop_mode on battery.
Defaults to 5, which enables laptop mode and forces the system to wait
5 seconds whenever something asks to write to disk to flush out as much
data as we can.
LAPTOP_BT_DIRTY_RATIO = the ratio of dirty memory to all memory that
processes start doing their own writeout.
Defaults to 60, which means that the kernel will not start forcing process
to write out file information that has been changed but not saved until 60%
of usable system memory is filled with dirty information.
LAPTOP_BT_DIRTY_BG_RATIO = The ratio of dirty memory to all memory that
pdflush will wake up and start writing to disk.
Defaults to 40, which means that the kernel will wake up a helper process
to try and write out dirty memory once 40% of usable system memory is dirty.
LAPTOP_BT_DIRTY_WRITEBACK = The number of centiseconds between periodic
wakeups of the pdflush daemons.
Defaults to 60000 (10 minutes), which menas that the kernel will flush dirty
memory every 10 minutes if dirty memory never hits 40% of system memory.
LAPTOP_AC_MODE = value for laptop_mode on AC power.
Defaults to 0, which disables laptop mode.
LAPTOP_AC_DIRTY_RATIO = the ratio of dirty memory to all memory that
processes start doing their own writeout.
Defaults to 10, which means that the kernel will not start forcing process
to write out file information that has been changed but not saved until 10%
of usable system memory is filled with dirty information.
LAPTOP_AC_DIRTY_BG_RATIO = The ratio of dirty memory to all memory that
pdflush will wake up and start writing to disk.
Defaults to 5, which means that the kernel will wake up a helper process
to try and write out dirty memory once 5% of usable system memory is dirty.
LAPTOP_AC_DIRTY_WRITEBACK = The number of centiseconds between periodic
wakeups of the pdflush daemons.
Defaults to 500, which menas that the kernel will flush dirty
memory every 500 seconds if dirty memory never hits 5% of system memory.
If system's primary harddisk /dev/sda is SSD and system is laptop, all
default values for AC are set to the same value of battery to reduce
write wear.
EOF
}
[ -w $VM/laptop_mode -a -w $VM/dirty_ratio ] || exit $NA
write_values() {
for f in $vmfiles; do
[ -w "$VM/$f" ] && echo $1 > "$VM/$f"
shift
done
}
laptop_mode_ac() {
# disable laptop mode
write_values "$LAPTOP_AC_MODE" "$LAPTOP_AC_DIRTY_RATIO" \
"$LAPTOP_AC_DIRTY_BG_RATIO" "$LAPTOP_AC_DIRTY_WRITEBACK"
echo "Laptop mode disabled."
}
laptop_mode_battery() {
write_values "$LAPTOP_BT_MODE" "$LAPTOP_BT_DIRTY_RATIO" \
"$LAPTOP_BT_DIRTY_BG_RATIO" "$LAPTOP_BT_DIRTY_WRITEBACK"
echo "Laptop mode enabled."
}
case $1 in
true) laptop_mode_battery ;;
false) laptop_mode_ac ;;
help) help;;
*) exit $NA ;;
esac
exit 0
