de021288a5
We create the /etc/modprobe.d/kvm.rt.tuned.conf file at every boot. However, there's nothing that guarantees that the kvm module will be loaded after tuned. Indeed, it's possible to reproduce a race where the kvm module is loaded before tuned. When this happens, the kvm module will be loaded with incorrect parameters as the kvm.rt.tuned.conf file doesn't exist. The solution to this problem is to create the kvm.rt.tuned.conf file only if it doesn't exist and delete it when changing profiles. Resolves: rhbz#1292117 Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> profiles/realtime-virtual-host/script.sh | 26 +++++++++++++++++--------- 1 file changed, 17 insertions(+), 9 deletions(-)
84 lines
2.6 KiB
Bash
Executable file
84 lines
2.6 KiB
Bash
Executable file
#!/bin/sh
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. /usr/lib/tuned/functions
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modfile=/etc/modprobe.d/kvm.rt.tuned.conf
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ltanfile=/sys/module/kvm/parameters/lapic_timer_advance_ns
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create_modfile()
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{
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modinfo -p kvm | grep -q kvmclock_periodic_sync
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if [ "$?" -eq 0 ]; then
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echo "options kvm kvmclock_periodic_sync=0" > $modfile
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fi
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modinfo -p kvm_intel | grep -q ple_gap
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if [ "$?" -eq 0 ]; then
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echo "options kvm_intel ple_gap=0" >> $modfile
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fi
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}
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start() {
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python /usr/libexec/tuned/defirqaffinity.py "remove" "$TUNED_isolated_cores_expanded" &&
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tuna -c "$TUNED_isolated_cores_expanded" -i
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retval = "$?"
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if [ ! $retval -eq 0 ]; then
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return $retval
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fi
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if [ ! -f $modfile ]; then
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create_modfile
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fi
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if [ -f lapic_timer_adv_ns.cpumodel ]; then
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curmodel=`cat /proc/cpuinfo | grep "model name" | cut -f 2 -d ":" | uniq`
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genmodel=`cat lapic_timer_adv_ns.cpumodel`
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if [ "$curmodel" != "$genmodel" ]; then
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rm -f lapic_timer_adv_ns
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rm -f lapic_timer_adv_ns.cpumodel
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fi
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fi
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if [ -f $ltanfile -a ! -f ./lapic_timer_adv_ns ]; then
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if [ -f /usr/share/qemu-kvm/tscdeadline_latency.flat ]; then
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tempdir=`mktemp -d`
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isolatedcpu=`echo "$TUNED_isolated_cores_expanded" | cut -f 1 -d ","`
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sh ./run-tscdeadline-latency.sh $isolatedcpu > $tempdir/lat.out
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sh ./find-lapictscdeadline-optimal.sh $tempdir/lat.out > $tempdir/opt.out
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if [ $? -eq 0 ]; then
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echo `cat $tempdir/opt.out | cut -f 2 -d ":"` > ./lapic_timer_adv_ns
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curmodel=`cat /proc/cpuinfo | grep "model name" | cut -f 2 -d ":" | uniq`
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echo "$curmodel" > lapic_timer_adv_ns.cpumodel
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fi
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fi
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fi
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if [ -f $ltanfile -a -f ./lapic_timer_adv_ns ]; then
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echo `cat ./lapic_timer_adv_ns` > $ltanfile
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fi
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return $retval
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}
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stop() {
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[ "$1" = "profile_switch" ] && rm -f $modfile
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tuna -c "$TUNED_isolated_cores_expanded" -I &&
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python /usr/libexec/tuned/defirqaffinity.py "add" "$TUNED_isolated_cores_expanded"
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return "$?"
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}
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verify() {
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python /usr/libexec/tuned/defirqaffinity.py "verify" "$TUNED_isolated_cores_expanded"
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retval = "$?"
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if [ $retval -eq 0 -a -f /sys/module/kvm/parameters/kvmclock_periodic_sync ]; then
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retval = `cat /sys/module/kvm/parameters/kvmclock_periodic_sync`
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fi
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if [ $retval -eq 0 -a -f /sys/module/kvm_intel/parameters/ple_gap ]; then
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retval = `cat /sys/module/kvm_intel/parameters/ple_gap`
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fi
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return $retval
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}
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process $@
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