#!/bin/bash
#
# Version for APM
#
# start or stop laptop_mode, best run by a power management daemon when
# ac gets connected/disconnected from a laptop
#
#
# Contributors to this script: Kiko Piris
# Bart Samwel
# Micha Feigin
# Andrew Morton
# Herve Eychenne
# Dax Kelson
#
# Original Linux 2.4 version by: Jens Axboe
#############################################################################
# Source config
if [ -f /etc/sysconfig/apmd ] ; then
. /etc/sysconfig/apmd
fi
# Don't raise an error if the config file is incomplete
# set defaults instead:
# Maximum time, in seconds, of hard drive spindown time that you are
# comfortable with. Worst case, it's possible that you could lose this
# amount of work if your battery fails you while in laptop mode.
MAX_AGE=${MAX_AGE:-'600'}
# Read-ahead, in kilobytes
READAHEAD=${READAHEAD:-'4096'}
# Shall we remount journaled fs. with appropriate commit interval? (1=yes)
DO_REMOUNTS=${DO_REMOUNTS:-'1'}
# And shall we add the "noatime" option to that as well? (1=yes)
DO_REMOUNT_NOATIME=${DO_REMOUNT_NOATIME:-'1'}
# Shall we adjust the idle timeout on a hard drive?
DO_HD=${DO_HD:-'1'}
# Adjust idle timeout on which hard drive?
HD="${HD:-'/dev/hda'}"
# spindown time for HD (hdparm -S values)
AC_HD=${AC_HD:-'244'}
BATT_HD=${BATT_HD:-'4'}
# Dirty synchronous ratio. At this percentage of dirty pages the process which
# calls write() does its own writeback
DIRTY_RATIO=${DIRTY_RATIO:-'40'}
# cpu frequency scaling
# See Documentation/cpu-freq/user-guide.txt for more info
DO_CPU=${CPU_MANAGE:-'0'}
CPU_MAXFREQ=${CPU_MAXFREQ:-'slowest'}
#
# Allowed dirty background ratio, in percent. Once DIRTY_RATIO has been
# exceeded, the kernel will wake pdflush which will then reduce the amount
# of dirty memory to dirty_background_ratio. Set this nice and low, so once
# some writeout has commenced, we do a lot of it.
#
DIRTY_BACKGROUND_RATIO=${DIRTY_BACKGROUND_RATIO:-'5'}
# kernel default dirty buffer age
DEF_AGE=${DEF_AGE:-'30'}
DEF_UPDATE=${DEF_UPDATE:-'5'}
DEF_DIRTY_BACKGROUND_RATIO=${DEF_DIRTY_BACKGROUND_RATIO:-'10'}
DEF_DIRTY_RATIO=${DEF_DIRTY_RATIO:-'40'}
DEF_XFS_AGE_BUFFER=${DEF_XFS_AGE_BUFFER:-'15'}
DEF_XFS_SYNC_INTERVAL=${DEF_XFS_SYNC_INTERVAL:-'30'}
DEF_XFS_BUFD_INTERVAL=${DEF_XFS_BUFD_INTERVAL:-'1'}
# This must be adjusted manually to the value of HZ in the running kernel
# on 2.4, until the XFS people change their 2.4 external interfaces to work in
# centisecs. This can be automated, but it's a work in progress that still needs
# some fixes. On 2.6 kernels, XFS uses USER_HZ instead of HZ for external
# interfaces, and that is currently always set to 100. So you don't need to
# change this on 2.6.
XFS_HZ=${XFS_HZ:-'100'}
#############################################################################
KLEVEL="$(uname -r |
{
IFS='.' read a b c
echo $a.$b
}
)"
case "$KLEVEL" in
"2.4"|"2.6")
;;
*)
echo "Unhandled kernel version: $KLEVEL ('uname -r' = '$(uname -r)')" >&2
exit 1
;;
esac
if [ ! -e /proc/sys/vm/laptop_mode ] ; then
echo "Kernel is not patched with laptop_mode patch." >&2
exit 1
fi
if [ ! -w /proc/sys/vm/laptop_mode ] ; then
echo "You do not have enough privileges to enable laptop_mode." >&2
exit 1
fi
# Remove an option (the first parameter) of the form option=<number> from
# a mount options string (the rest of the parameters).
parse_mount_opts () {
OPT="$1"
shift
echo ",$*," | sed \
-e 's/,'"$OPT"'=[0-9]*,/,/g' \
-e 's/,,*/,/g' \
-e 's/^,//' \
-e 's/,$//'
}
# Remove an option (the first parameter) without any arguments from
# a mount option string (the rest of the parameters).
parse_nonumber_mount_opts () {
OPT="$1"
shift
echo ",$*," | sed \
-e 's/,'"$OPT"',/,/g' \
-e 's/,,*/,/g' \
-e 's/^,//' \
-e 's/,$//'
}
# Find out the state of a yes/no option (e.g. "atime"/"noatime") in
# fstab for a given filesystem, and use this state to replace the
# value of the option in another mount options string. The device
# is the first argument, the option name the second, and the default
# value the third. The remainder is the mount options string.
#
# Example:
# parse_yesno_opts_wfstab /dev/hda1 atime atime defaults,noatime
#
# If fstab contains, say, "rw" for this filesystem, then the result
# will be "defaults,atime".
parse_yesno_opts_wfstab () {
L_DEV="$1"
OPT="$2"
DEF_OPT="$3"
shift 3
L_OPTS="$*"
PARSEDOPTS1="$(parse_nonumber_mount_opts $OPT $L_OPTS)"
PARSEDOPTS1="$(parse_nonumber_mount_opts no$OPT $PARSEDOPTS1)"
# Watch for a default atime in fstab
FSTAB_OPTS="$(awk '$1 == "'$L_DEV'" { print $4 }' /etc/fstab)"
if echo "$FSTAB_OPTS" | grep "$OPT" > /dev/null ; then
# option specified in fstab: extract the value and use it
if echo "$FSTAB_OPTS" | grep "no$OPT" > /dev/null ; then
echo "$PARSEDOPTS1,no$OPT"
else
# no$OPT not found -- so we must have $OPT.
echo "$PARSEDOPTS1,$OPT"
fi
else
# option not specified in fstab -- choose the default.
echo "$PARSEDOPTS1,$DEF_OPT"
fi
}
# Find out the state of a numbered option (e.g. "commit=NNN") in
# fstab for a given filesystem, and use this state to replace the
# value of the option in another mount options string. The device
# is the first argument, and the option name the second. The
# remainder is the mount options string in which the replacement
# must be done.
#
# Example:
# parse_mount_opts_wfstab /dev/hda1 commit defaults,commit=7
#
# If fstab contains, say, "commit=3,rw" for this filesystem, then the
# result will be "rw,commit=3".
parse_mount_opts_wfstab () {
L_DEV="$1"
OPT="$2"
shift 2
L_OPTS="$*"
PARSEDOPTS1="$(parse_mount_opts $OPT $L_OPTS)"
# Watch for a default commit in fstab
FSTAB_OPTS="$(awk '$1 == "'$L_DEV'" { print $4 }' /etc/fstab)"
if echo "$FSTAB_OPTS" | grep "$OPT=" > /dev/null ; then
# option specified in fstab: extract the value, and use it
echo -n "$PARSEDOPTS1,$OPT="
echo ",$FSTAB_OPTS," | sed \
-e 's/.*,'"$OPT"'=//' \
-e 's/,.*//'
else
# option not specified in fstab: set it to 0
echo "$PARSEDOPTS1,$OPT=0"
fi
}
deduce_fstype () {
MP="$1"
# My root filesystem unfortunately has
# type "unknown" in /etc/mtab. If we encounter
# "unknown", we try to get the type from fstab.
cat /etc/fstab |
grep -v '^#' |
while read FSTAB_DEV FSTAB_MP FSTAB_FST FSTAB_OPTS FSTAB_DUMP FSTAB_DUMP ; do
if [ "$FSTAB_MP" = "$MP" ]; then
echo $FSTAB_FST
exit 0
fi
done
}
if [ $DO_REMOUNT_NOATIME -eq 1 ] ; then
NOATIME_OPT=",noatime"
fi
case "$1" in
start)
AGE=$((100*$MAX_AGE))
XFS_AGE=$(($XFS_HZ*$MAX_AGE))
echo -n "Starting laptop_mode"
if [ -d /proc/sys/vm/pagebuf ] ; then
# (For 2.4 and early 2.6.)
# This only needs to be set, not reset -- it is only used when
# laptop mode is enabled.
echo $XFS_AGE > /proc/sys/vm/pagebuf/lm_flush_age
echo $XFS_AGE > /proc/sys/fs/xfs/lm_sync_interval
elif [ -f /proc/sys/fs/xfs/lm_age_buffer ] ; then
# (A couple of early 2.6 laptop mode patches had these.)
# The same goes for these.
echo $XFS_AGE > /proc/sys/fs/xfs/lm_age_buffer
echo $XFS_AGE > /proc/sys/fs/xfs/lm_sync_interval
elif [ -f /proc/sys/fs/xfs/age_buffer ] ; then
# (2.6.6)
# But not for these -- they are also used in normal
# operation.
echo $XFS_AGE > /proc/sys/fs/xfs/age_buffer
echo $XFS_AGE > /proc/sys/fs/xfs/sync_interval
elif [ -f /proc/sys/fs/xfs/age_buffer_centisecs ] ; then
# (2.6.7 upwards)
# And not for these either. These are in centisecs,
# not USER_HZ, so we have to use $AGE, not $XFS_AGE.
echo $AGE > /proc/sys/fs/xfs/age_buffer_centisecs
echo $AGE > /proc/sys/fs/xfs/xfssyncd_centisecs
echo 3000 > /proc/sys/fs/xfs/xfsbufd_centisecs
fi
case "$KLEVEL" in
"2.4")
echo 1 > /proc/sys/vm/laptop_mode
echo "30 500 0 0 $AGE $AGE 60 20 0" > /proc/sys/vm/bdflush
;;
"2.6")
echo 5 > /proc/sys/vm/laptop_mode
echo "$AGE" > /proc/sys/vm/dirty_writeback_centisecs
echo "$AGE" > /proc/sys/vm/dirty_expire_centisecs
echo "$DIRTY_RATIO" > /proc/sys/vm/dirty_ratio
echo "$DIRTY_BACKGROUND_RATIO" > /proc/sys/vm/dirty_background_ratio
;;
esac
if [ $DO_REMOUNTS -eq 1 ]; then
cat /etc/mtab | while read DEV MP FST OPTS DUMP PASS ; do
PARSEDOPTS="$(parse_mount_opts "$OPTS")"
if [ "$FST" = 'unknown' ]; then
FST=$(deduce_fstype $MP)
fi
case "$FST" in
"ext3"|"reiserfs")
PARSEDOPTS="$(parse_mount_opts commit "$OPTS")"
mount $DEV -t $FST $MP -o remount,$PARSEDOPTS,commit=$MAX_AGE$NOATIME_OPT
;;
"xfs")
mount $DEV -t $FST $MP -o remount,$OPTS$NOATIME_OPT
;;
esac
if [ -b $DEV ] ; then
blockdev --setra $(($READAHEAD * 2)) $DEV
fi
done
fi
if [ $DO_HD -eq 1 ] ; then
for THISHD in $HD ; do
/sbin/hdparm -S $BATT_HD $THISHD > /dev/null 2>&1
/sbin/hdparm -B 1 $THISHD > /dev/null 2>&1
done
fi
if [ $DO_CPU -eq 1 ]; then
for THISCPU in /sys/devices/system/cpu/*/; do
if [ -e $THISCPU/cpufreq/cpuinfo_min_freq ]; then
if [ $CPU_MAXFREQ = 'slowest' ]; then
CPU_MAXFREQ=`cat $THISCPU/cpufreq/cpuinfo_min_freq`
fi
echo $CPU_MAXFREQ > $THISCPU/cpufreq/scaling_max_freq
fi
done
fi
echo "."
;;
stop)
U_AGE=$((100*$DEF_UPDATE))
B_AGE=$((100*$DEF_AGE))
echo -n "Stopping laptop_mode"
echo 0 > /proc/sys/vm/laptop_mode
if [ -f /proc/sys/fs/xfs/age_buffer -a ! -f /proc/sys/fs/xfs/lm_age_buffer ] ; then
# These need to be restored, if there are no lm_*.
echo $(($XFS_HZ*$DEF_XFS_AGE_BUFFER)) > /proc/sys/fs/xfs/age_buffer
echo $(($XFS_HZ*$DEF_XFS_SYNC_INTERVAL)) > /proc/sys/fs/xfs/sync_interval
elif [ -f /proc/sys/fs/xfs/age_buffer_centisecs ] ; then
# These need to be restored as well.
echo $((100*$DEF_XFS_AGE_BUFFER)) > /proc/sys/fs/xfs/age_buffer_centisecs
echo $((100*$DEF_XFS_SYNC_INTERVAL)) > /proc/sys/fs/xfs/xfssyncd_centisecs
echo $((100*$DEF_XFS_BUFD_INTERVAL)) > /proc/sys/fs/xfs/xfsbufd_centisecs
fi
case "$KLEVEL" in
"2.4")
echo "30 500 0 0 $U_AGE $B_AGE 60 20 0" > /proc/sys/vm/bdflush
;;
"2.6")
echo "$U_AGE" > /proc/sys/vm/dirty_writeback_centisecs
echo "$B_AGE" > /proc/sys/vm/dirty_expire_centisecs
echo "$DEF_DIRTY_RATIO" > /proc/sys/vm/dirty_ratio
echo "$DEF_DIRTY_BACKGROUND_RATIO" > /proc/sys/vm/dirty_background_ratio
;;
esac
if [ $DO_REMOUNTS -eq 1 ] ; then
cat /etc/mtab | while read DEV MP FST OPTS DUMP PASS ; do
# Reset commit and atime options to defaults.
if [ "$FST" = 'unknown' ]; then
FST=$(deduce_fstype $MP)
fi
case "$FST" in
"ext3"|"reiserfs")
PARSEDOPTS="$(parse_mount_opts_wfstab $DEV commit $OPTS)"
PARSEDOPTS="$(parse_yesno_opts_wfstab $DEV atime atime $PARSEDOPTS)"
mount $DEV -t $FST $MP -o remount,$PARSEDOPTS
;;
"xfs")
PARSEDOPTS="$(parse_yesno_opts_wfstab $DEV atime atime $OPTS)"
mount $DEV -t $FST $MP -o remount,$PARSEDOPTS
;;
esac
if [ -b $DEV ] ; then
blockdev --setra 256 $DEV
fi
done
fi
if [ $DO_HD -eq 1 ] ; then
for THISHD in $HD ; do
/sbin/hdparm -S $AC_HD $THISHD > /dev/null 2>&1
/sbin/hdparm -B 255 $THISHD > /dev/null 2>&1
done
fi
if [ $DO_CPU -eq 1 ]; then
for THISCPU in /sys/devices/system/cpu/*/; do
if [ -e $THISCPU/cpufreq/cpuinfo_min_freq ]; then
echo `cat $THISCPU/cpufreq/cpuinfo_max_freq` > $THISCPU/cpufreq/scaling_max_freq
fi
done
fi
echo "."
;;
*)
echo "Usage: $0 {start|stop}" 2>&1
exit 1
;;
esac
exit 0