libvirt users - May 2012 - What features of kernel are required to support virDomainGetCPUStats?

Hi,
    Weeks ago, I developed my app under ubuntu-11.10 (kernel 3.0) with
lilbvirt-0.9.10. In my code , I used virDomainGetCPUStats to query cpu
usage info of domains, and it worked well.
However, today, I port my code to ubuntu-10.04.4 (kernel 2.6.32) with
libvirt-0.9.10, I find the function virDomainGetCPUStats can't work
and complains "this function is not supported by the connection
driver: virDomainGetCPUStats".
    I guess the kernel difference cause this problem because the
libvirt is the same on two operating systems. I wonder what features
of kernel are required to support virDomainGetCPUStats? I thought
cgroup is a prerequisite. The following are  .config files of two
kernels.

    ubuntu-11.10
CONFIG_CGROUP_FREEZER=y
CONFIG_CGROUP_DEVICE=y
CONFIG_CPUSETS=y
CONFIG_PROC_PID_CPUSET=y
CONFIG_CGROUP_CPUACCT=y
CONFIG_RESOURCE_COUNTERS=y
CONFIG_CGROUP_MEM_RES_CTLR=y
CONFIG_CGROUP_MEM_RES_CTLR_SWAP=y
CONFIG_CGROUP_MEM_RES_CTLR_SWAP_ENABLED=y
CONFIG_CGROUP_PERF=y
CONFIG_CGROUP_SCHED=y
CONFIG_FAIR_GROUP_SCHED=y
CONFIG_RT_GROUP_SCHED=y
CONFIG_BLK_CGROUP=y


    ubuntu-10.04.4
CONFIG_CGROUP_NS=y
CONFIG_CGROUP_FREEZER=y
CONFIG_CGROUP_DEVICE=y
CONFIG_CPUSETS=y
CONFIG_PROC_PID_CPUSET=y
CONFIG_CGROUP_CPUACCT=y
CONFIG_RESOURCE_COUNTERS=y
CONFIG_CGROUP_MEM_RES_CTLR=y
CONFIG_CGROUP_MEM_RES_CTLR_SWAP=y
CONFIG_CGROUP_SCHED=y
CONFIG_FAIR_GROUP_SCHED=y
CONFIG_RT_GROUP_SCHED=y
CONFIG_MM_OWNER=y

   As you can see, CPUSET and CPUACCT are enabled in both kernels. So
what else features of kernel are required to support
virDomainGetCPUStats?


harvey

On 05/27/2012 10:38 PM, Zhihua Che wrote:
> Hi,
>     Weeks ago, I developed my app under ubuntu-11.10 (kernel 3.0) with
> lilbvirt-0.9.10. In my code , I used virDomainGetCPUStats to query cpu
> usage info of domains, and it worked well.
> However, today, I port my code to ubuntu-10.04.4 (kernel 2.6.32) with
> libvirt-0.9.10, I find the function virDomainGetCPUStats can't work
> and complains "this function is not supported by the connection
> driver: virDomainGetCPUStats".
That's not a problem with your kernel, but with your libvirtd being too
old.  virDomainGetCPUStats was not wired up for qemu until libvirt
0.9.11.  See here for the full table of which libvirtd versions support
which APIs for a given URI:

http://libvirt.org/hvsupport.html

-- 
Eric Blake   eblake at redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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