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Mark McLoughlin |
cd8d5c |
#!/bin/bash
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Mark McLoughlin |
cd8d5c |
#
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Mark McLoughlin |
cd8d5c |
# Copyright 2009 Red Hat, Inc. and/or its affiliates.
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
#
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Mark McLoughlin |
cd8d5c |
# Author: Dan Kenigsberg <danken@redhat.com>
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Mark McLoughlin |
cd8d5c |
#
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
# should search for duplicated pages.
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Mark McLoughlin |
cd8d5c |
#
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
# make ksm work harder and harder untill memory load falls below that
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Mark McLoughlin |
cd8d5c |
# threshold.
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Mark McLoughlin |
cd8d5c |
#
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Mark McLoughlin |
39f14e |
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Mark McLoughlin |
39f14e |
# following its death, to retune ksm accordingly
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Mark McLoughlin |
39f14e |
#
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Mark McLoughlin |
cd8d5c |
# needs testing and ironing. contact danken@redhat.com if something breaks.
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
if [ -f /etc/ksmtuned.conf ]; then
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Mark McLoughlin |
cd8d5c |
. /etc/ksmtuned.conf
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Mark McLoughlin |
cd8d5c |
fi
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Mark McLoughlin |
cd8d5c |
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Justin M. Forbes |
563054 |
debug() {
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Justin M. Forbes |
563054 |
if [ -n "$DEBUG" ]; then
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Justin M. Forbes |
563054 |
s="`/bin/date`: $*"
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Justin M. Forbes |
563054 |
[ -n "$LOGFILE" ] && echo "$s" >> "$LOGFILE" || echo "$s"
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Justin M. Forbes |
563054 |
fi
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Justin M. Forbes |
563054 |
}
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Justin M. Forbes |
563054 |
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Justin M. Forbes |
563054 |
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Mark McLoughlin |
cd8d5c |
KSM_MONITOR_INTERVAL=${KSM_MONITOR_INTERVAL:-60}
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Mark McLoughlin |
cd8d5c |
KSM_NPAGES_BOOST=${KSM_NPAGES_BOOST:-300}
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Mark McLoughlin |
cd8d5c |
KSM_NPAGES_DECAY=${KSM_NPAGES_DECAY:--50}
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
KSM_NPAGES_MIN=${KSM_NPAGES_MIN:-64}
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Mark McLoughlin |
cd8d5c |
KSM_NPAGES_MAX=${KSM_NPAGES_MAX:-1250}
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Mark McLoughlin |
cd8d5c |
# millisecond sleep between ksm scans for 16Gb server. Smaller servers sleep
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
KSM_SLEEP_MSEC=${KSM_SLEEP_MSEC:-10}
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
KSM_THRES_COEF=${KSM_THRES_COEF:-20}
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Mark McLoughlin |
cd8d5c |
KSM_THRES_CONST=${KSM_THRES_CONST:-2048}
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
total=`awk '/^MemTotal:/ {print $2}' /proc/meminfo`
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Justin M. Forbes |
563054 |
debug total $total
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
npages=0
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Mark McLoughlin |
cd8d5c |
sleep=$[KSM_SLEEP_MSEC * 16 * 1024 * 1024 / total]
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Mark McLoughlin |
cd8d5c |
[ $sleep -le 10 ] && sleep=10
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Justin M. Forbes |
563054 |
debug sleep $sleep
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Mark McLoughlin |
cd8d5c |
thres=$[total * KSM_THRES_COEF / 100]
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Mark McLoughlin |
cd8d5c |
if [ $KSM_THRES_CONST -gt $thres ]; then
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Mark McLoughlin |
cd8d5c |
thres=$KSM_THRES_CONST
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Mark McLoughlin |
cd8d5c |
fi
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Justin M. Forbes |
563054 |
debug thres $thres
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
KSMCTL () {
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Mark McLoughlin |
cd8d5c |
case x$1 in
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Mark McLoughlin |
cd8d5c |
xstop)
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Mark McLoughlin |
cd8d5c |
echo 0 > /sys/kernel/mm/ksm/run
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
xstart)
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Mark McLoughlin |
cd8d5c |
echo $2 > /sys/kernel/mm/ksm/pages_to_scan
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Mark McLoughlin |
cd8d5c |
echo $3 > /sys/kernel/mm/ksm/sleep_millisecs
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Mark McLoughlin |
cd8d5c |
echo 1 > /sys/kernel/mm/ksm/run
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
esac
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Mark McLoughlin |
cd8d5c |
}
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
committed_memory () {
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Mark McLoughlin |
cd8d5c |
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af1488 |
local pidlist
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acbc4a |
pidlist=$(pgrep -d ' ' -- '^qemu(-(kvm|system-.+)|:.{1,11})$')
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af1488 |
if [ -n "$pidlist" ]; then
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af1488 |
ps -p "$pidlist" -o rsz=
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acbc4a |
fi | awk '{ sum += $1 }; END { print 0+sum }'
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Mark McLoughlin |
cd8d5c |
}
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
free_memory () {
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Justin M. Forbes |
afaf04 |
awk '/^(MemFree|Buffers|Cached):/ {free += $2}; END {print free}' \
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Mark McLoughlin |
cd8d5c |
/proc/meminfo
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Mark McLoughlin |
cd8d5c |
}
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
increase_npages() {
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Mark McLoughlin |
cd8d5c |
local delta
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Mark McLoughlin |
cd8d5c |
delta=${1:-0}
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Mark McLoughlin |
cd8d5c |
npages=$[npages + delta]
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Mark McLoughlin |
cd8d5c |
if [ $npages -lt $KSM_NPAGES_MIN ]; then
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Mark McLoughlin |
cd8d5c |
npages=$KSM_NPAGES_MIN
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Mark McLoughlin |
cd8d5c |
elif [ $npages -gt $KSM_NPAGES_MAX ]; then
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Mark McLoughlin |
cd8d5c |
npages=$KSM_NPAGES_MAX
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Mark McLoughlin |
cd8d5c |
fi
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Mark McLoughlin |
cd8d5c |
echo $npages
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Mark McLoughlin |
cd8d5c |
}
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
adjust () {
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Mark McLoughlin |
cd8d5c |
local free committed
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Mark McLoughlin |
cd8d5c |
free=`free_memory`
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Mark McLoughlin |
cd8d5c |
committed=`committed_memory`
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Justin M. Forbes |
563054 |
debug committed $committed free $free
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Mark McLoughlin |
cd8d5c |
if [ $[committed + thres] -lt $total -a $free -gt $thres ]; then
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Mark McLoughlin |
cd8d5c |
KSMCTL stop
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Justin M. Forbes |
563054 |
debug "$[committed + thres] < $total and free > $thres, stop ksm"
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Mark McLoughlin |
cd8d5c |
return 1
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Mark McLoughlin |
cd8d5c |
fi
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Justin M. Forbes |
563054 |
debug "$[committed + thres] > $total, start ksm"
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Mark McLoughlin |
cd8d5c |
if [ $free -lt $thres ]; then
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Mark McLoughlin |
cd8d5c |
npages=`increase_npages $KSM_NPAGES_BOOST`
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Justin M. Forbes |
563054 |
debug "$free < $thres, boost"
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Mark McLoughlin |
cd8d5c |
else
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Mark McLoughlin |
cd8d5c |
npages=`increase_npages $KSM_NPAGES_DECAY`
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Justin M. Forbes |
563054 |
debug "$free > $thres, decay"
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Mark McLoughlin |
cd8d5c |
fi
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Mark McLoughlin |
cd8d5c |
KSMCTL start $npages $sleep
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Justin M. Forbes |
563054 |
debug "KSMCTL start $npages $sleep"
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Mark McLoughlin |
cd8d5c |
return 0
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Mark McLoughlin |
cd8d5c |
}
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
39f14e |
function nothing () {
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Mark McLoughlin |
39f14e |
:
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Mark McLoughlin |
39f14e |
}
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Mark McLoughlin |
39f14e |
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Mark McLoughlin |
cd8d5c |
loop () {
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Mark McLoughlin |
39f14e |
trap nothing SIGUSR1
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Mark McLoughlin |
cd8d5c |
while true
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Mark McLoughlin |
cd8d5c |
do
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Mark McLoughlin |
39f14e |
sleep $KSM_MONITOR_INTERVAL &
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Mark McLoughlin |
39f14e |
wait $!
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Mark McLoughlin |
cd8d5c |
adjust
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Mark McLoughlin |
cd8d5c |
done
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Mark McLoughlin |
cd8d5c |
}
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Mark McLoughlin |
cd8d5c |
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Mark McLoughlin |
cd8d5c |
PIDFILE=${PIDFILE-/var/run/ksmtune.pid}
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Mark McLoughlin |
cd8d5c |
if touch "$PIDFILE"; then
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Mark McLoughlin |
cd8d5c |
loop &
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Mark McLoughlin |
cd8d5c |
echo $! > "$PIDFILE"
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Mark McLoughlin |
cd8d5c |
fi
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