On Sun, 2010-09-19 at 12:04 -0400, Kevin O'Connor wrote:
> On Sun, Sep 19, 2010 at 05:53:47PM +0200, Gleb Natapov wrote:
> > On Sun, Sep 19, 2010 at 05:44:00PM +0200, Conrad Wood wrote:
> > >
> > > > > However after step 7 the guest can turn the cpu online again by issuing
> > > > > echo 1 >/sys/devices/.../cpuX/online
> > > > There will be no /sys/devices/.../cpuX/online in guest after step 7.
> > >
> > > Well then at least in my version there's a bug, because it still is
> > > there and never goes away. (kvm 0.12.5)
> > > And changing it to online works as well.
> > Can you provide exact steps you are using? After doing cpu_set x offline
> > cpu x should disappear from a guest. Otherwise cpu eject didn't work.
>
> I'm confused. The "cpu_set x offline" doesn't appear to do anything
> for me. It does not disable the cpu, nor does it inform the guest to
> disable the cpu.
I second that - same here.
a script with my exact steps is below. Result is reproducible.
When run on my system it will output:
"Known CPUs" are defined as cpus with an entry
in /sys/devices/system/cpu on the guest
"Inserted CPUs" are defined as cpus listed by info cpus in qemu monitor
"online CPUs" are defined as cpus listed in /proc/cpuinfo on the guest
Inserted CPUs: 4, CPUs known to the guest: 4, ONLINE in guest: 4
Inserting CPU #4
Inserted CPUs: 5, CPUs known to the guest: 5, ONLINE in guest: 4
Ejecting CPU #4
Inserted CPUs: 5, CPUs known to the guest: 5, ONLINE in guest: 4
Setting all available cpus to online...
bash: line 0: echo: write error: Invalid argument
bash: line 0: echo: write error: Invalid argument
bash: line 0: echo: write error: Invalid argument
Inserted CPUs: 5, CPUs known to the guest: 5, ONLINE in guest: 5
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
after cpu_set 4 offline this should not come online again!!
---------------------------------------------------
#!/bin/bash
VM=192.168.2.35
MONITORHOST=localhost
MONITORPORT=9401
# count how many cpus are in /proc/cpuinfo on the guest
countOnline() {
ONLINECPUS=`ssh -lroot ${VM} "grep processor /proc/cpuinfo | wc -l"`
}
# count how many cpus are in /sys/devices/...
countCPUsKnown() {
KNOWNCPUS=`ssh -lroot ${VM} "find /sys/devices/system/cpu/ -name
'cpu?'| wc -l"`
}
# count how many cpus does kvm list
countInserted() {
INSERTEDCPUS=`echo "info cpus" | nc ${MONITORHOST} ${MONITORPORT} |
grep -av '(qemu)'|grep -va 'for more inform'|wc -l`
}
printInfo() {
countOnline
countCPUsKnown
countInserted
echo "Inserted CPUs: ${INSERTEDCPUS}, CPUs known to the guest:
${KNOWNCPUS}, ONLINE in guest: ${ONLINECPUS}"
}
echo "\"Known CPUs\" are defined as cpus with an entry
in /sys/devices/system/cpu on the guest"
echo "\"Inserted CPUs\" are defined as cpus listed by info cpus in qemu
monitor"
echo "\"online CPUs\" are defined as cpus listed in /proc/cpuinfo on the
guest"
echo
printInfo
echo "Inserting CPU #4"
echo "cpu_set 4 online" | nc ${MONITORHOST} ${MONITORPORT} >/dev/null
printInfo
echo "Ejecting CPU #4"
echo "cpu_set 4 offline" | nc ${MONITORHOST} ${MONITORPORT} >/dev/null
printInfo
echo "Setting all available cpus to online..."
ssh -lroot ${VM} "find /sys/devices/system/cpu/ -type f -path
'*/cpu?/online' -exec bash -c \"echo 1 >{}\" \;"
printInfo
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