libvirt users - Jul 2015 - Re: cpuacct and emulator/cpuacct

Hello,

Does it exist some documentation concerning following topic ?

What's difference between following perf counters :

/cgroup/cpuacct/libvirt/qemu/test/cpuacct.usage
and
/cgroup/cpuacct/libvirt/qemu/test/emulator/cpuacct.usage



Thx .
Regards,


J.P. Ribeauville


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On Wed, Jul 08, 2015 at 09:11:11AM +0000, Jean-Pierre Ribeauville
wrote:
>Hello,
>
>Does it exist some documentation concerning following topic ?
>
>What's difference between following perf counters :
>
>/cgroup/cpuacct/libvirt/qemu/test/cpuacct.usage
>and
>/cgroup/cpuacct/libvirt/qemu/test/emulator/cpuacct.usage
>
I don't know from the top of my head whether the accounting is
effective for all tasks in the current group (i.e. /test/cpuacct.usage
only accounts for /test/tasks) or also subgroups.  Anyway, if the
second is true (which I think it is), then /test/emulator is only
accounting for the emulator thread and the upper one is for emulator,
all vCPU threads and I/O threads.

Martin

Hi,
Thanks for your prompt answer.

Regards.

J.P.

-----Message d'origine-----
De : Martin Kletzander [mailto:mkletzan@redhat.com] 
Envoyé : jeudi 9 juillet 2015 14:46
À : Jean-Pierre Ribeauville
Cc : libvirt-users@redhat.com
Objet : Re: [libvirt-users] cpuacct and emulator/cpuacct

On Wed, Jul 08, 2015 at 09:11:11AM +0000, Jean-Pierre Ribeauville
wrote:
>Hello,
>
>Does it exist some documentation concerning following topic ?
>
>What's difference between following perf counters :
>
>/cgroup/cpuacct/libvirt/qemu/test/cpuacct.usage
>and
>/cgroup/cpuacct/libvirt/qemu/test/emulator/cpuacct.usage
>
I don't know from the top of my head whether the accounting is effective for
all tasks in the current group (i.e. /test/cpuacct.usage only accounts for
/test/tasks) or also subgroups.  Anyway, if the second is true (which I think it
is), then /test/emulator is only accounting for the emulator thread and the
upper one is for emulator, all vCPU threads and I/O threads.

Martin