2:37 a.m.
Hi,
We are implementing feature called CPU separation in the platform. So,
guest VMs will have dedicated cores allocated using cgroups (cgroups
hierachy related VMs managed by libvirt).
virsh cpu-stats command is not working in our platform :
virsh # cpu-stats test_vm
error: Failed to virDomainGetCPUStats()
error: Requested operation is not valid: cgroup CPUACCT controller is not
mounted
It should show info like this.
$ virsh cpu-stats test_vm
CPU0:
cpu_time 0.025812184 seconds
vcpu_time 0.025812184 seconds
CPU1:
cpu_time 4.893484927 seconds
vcpu_time 4.893484927 seconds
Total:
cpu_time 4.924620941 seconds
user_time 1.060000000 seconds
system_time 3.050000000 seconds
We are suspecting some issue in virsh when it is trying to find to where
that cgroups is mounted in a system (default in ubuntu is
/sys/fs/cgroup/cpuset/libvirt/, but in our platform uses /dev/cgroup_xxx).
Find /proc/cgroups and /proc/mounts log below:
==================================
# cat /proc/cgroups
#subsys_name hierarchy num_cgroups enabled
cpuset 0 1 1
ns 0 1 1
cpu 1 3 1
cpuacct 0 1 1
memory 2 1 1
freezer 0 1 1
net_cls 0 1 1
blkio 0 1 1
# cat /proc/mounts
cpu /dev/cgroup_cpu cgroup rw,relatime,cpu 0 0
memory /dev/cgroup_mem cgroup rw,relatime,memory 0 0
Can you please help us in this regard to enable this command in our
platform,
Thanks in advance !!!
Regards,
Anusha
4:57 p.m.
On 05/30/2013 01:37 AM, Anusha Rayani wrote:
Hi,
We are implementing feature called CPU separation in the platform. So,
guest VMs will have dedicated cores allocated using cgroups (cgroups
hierachy related VMs managed by libvirt).
virsh cpu-stats command is not working in our platform :
virsh # cpu-stats test_vm
error: Failed to virDomainGetCPUStats()
error: Requested operation is not valid: cgroup CPUACCT controller is not
mounted
Which version of libvirt? Libvirt 1.0.5 included several improvements
to cgroup; perhaps some of those are relevant? Libvirt is supposed to
find cgroup controllers, regardless of how you spell their mount point
(it inspects procfs to learn the cgroups of the current process, rather
than hard-coding any particular path). Are you sure you had cpuacct
mounted?
# cat /proc/cgroups
#subsys_name hierarchy num_cgroups enabled
cpuset 0 1 1
ns 0 1 1
cpu 1 3 1
cpuacct 0 1 1
memory 2 1 1
freezer 0 1 1
net_cls 0 1 1
blkio 0 1 1
# cat /proc/mounts
cpu /dev/cgroup_cpu cgroup rw,relatime,cpu 0 0
memory /dev/cgroup_mem cgroup rw,relatime,memory 0 0
That makes it sound like you haven't mounted quite enough cgroup
controllers.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
2:48 a.m.
Hi,
we are using currently libvirt-0.10.2.
And yes in our platform cpu contorller(cpuacct) is not mounted.
Could you please let us know how we can mount more controllers through
libvirt.
It would be helpful for us.
Regards,
Anusha
On Fri, May 31, 2013 at 3:27 AM, Eric Blake <eblake(a)redhat.com> wrote:
On 05/30/2013 01:37 AM, Anusha Rayani wrote:
> Hi,
>
> We are implementing feature called CPU separation in the platform. So,
> guest VMs will have dedicated cores allocated using cgroups (cgroups
> hierachy related VMs managed by libvirt).
>
> virsh cpu-stats command is not working in our platform :
>
> virsh # cpu-stats test_vm
> error: Failed to virDomainGetCPUStats()
>
> error: Requested operation is not valid: cgroup CPUACCT controller is not
> mounted
Which version of libvirt? Libvirt 1.0.5 included several improvements
to cgroup; perhaps some of those are relevant? Libvirt is supposed to
find cgroup controllers, regardless of how you spell their mount point
(it inspects procfs to learn the cgroups of the current process, rather
than hard-coding any particular path). Are you sure you had cpuacct
mounted?
> # cat /proc/cgroups
> #subsys_name hierarchy num_cgroups enabled
> cpuset 0 1 1
> ns 0 1 1
> cpu 1 3 1
> cpuacct 0 1 1
> memory 2 1 1
> freezer 0 1 1
> net_cls 0 1 1
> blkio 0 1 1
>
> # cat /proc/mounts
> cpu /dev/cgroup_cpu cgroup rw,relatime,cpu 0 0
> memory /dev/cgroup_mem cgroup rw,relatime,memory 0 0
That makes it sound like you haven't mounted quite enough cgroup
controllers.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
9:45 a.m.
Hi,
We have tried with latest libvirt i.e, libvirt-1.0.5 also.
Still i am facing the same error in executing the "cpu-stats" command :
virsh # cpu-stats test
error: Failed to retrieve CPU statistics for domain 'test'
error: Requested operation is not valid: cgroup CPUACCT controller is not
mounted
It would be very helpful for us if you could suggest something to make
cpuacct controller mounted.
Regards,
Anusha
On Fri, May 31, 2013 at 1:18 PM, Anusha Rayani <anusha.rayani(a)gmail.com>wrote:
Hi,
we are using currently libvirt-0.10.2.
And yes in our platform cpu contorller(cpuacct) is not mounted.
Could you please let us know how we can mount more controllers through
libvirt.
It would be helpful for us.
Regards,
Anusha
On Fri, May 31, 2013 at 3:27 AM, Eric Blake <eblake(a)redhat.com> wrote:
> On 05/30/2013 01:37 AM, Anusha Rayani wrote:
> > Hi,
> >
> > We are implementing feature called CPU separation in the platform. So,
> > guest VMs will have dedicated cores allocated using cgroups (cgroups
> > hierachy related VMs managed by libvirt).
> >
> > virsh cpu-stats command is not working in our platform :
> >
> > virsh # cpu-stats test_vm
> > error: Failed to virDomainGetCPUStats()
> >
> > error: Requested operation is not valid: cgroup CPUACCT controller is
> not
> > mounted
>
> Which version of libvirt? Libvirt 1.0.5 included several improvements
> to cgroup; perhaps some of those are relevant? Libvirt is supposed to
> find cgroup controllers, regardless of how you spell their mount point
> (it inspects procfs to learn the cgroups of the current process, rather
> than hard-coding any particular path). Are you sure you had cpuacct
> mounted?
>
> > # cat /proc/cgroups
> > #subsys_name hierarchy num_cgroups enabled
> > cpuset 0 1 1
> > ns 0 1 1
> > cpu 1 3 1
> > cpuacct 0 1 1
> > memory 2 1 1
> > freezer 0 1 1
> > net_cls 0 1 1
> > blkio 0 1 1
> >
> > # cat /proc/mounts
> > cpu /dev/cgroup_cpu cgroup rw,relatime,cpu 0 0
> > memory /dev/cgroup_mem cgroup rw,relatime,memory 0 0
>
> That makes it sound like you haven't mounted quite enough cgroup
> controllers.
>
> --
> Eric Blake eblake redhat com +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
>
9:47 a.m.
On 05/31/2013 01:48 AM, Anusha Rayani wrote:
Hi,
we are using currently libvirt-0.10.2.
And yes in our platform cpu contorller(cpuacct) is not mounted.
Could you please let us know how we can mount more controllers through
libvirt.
Libvirt won't mount cgroup controllers if they are not already mounted.
You'll have to do that yourself outside of libvirt, then restart
libvirtd so that libvirt will learn the new mount point.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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