How to query the number of processes queueing for the CPU inside the VM

How to query the number of processes queueing for the CPU inside the VM

[João Vilaça]

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In KubeVirt, through libvirt, we need to know the number of processes
queued for the CPU inside the VM.

Can we get this information through the qemu-guest-agent?

-- 
kind regards,
João Vilaça

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Re: How to query the number of processes queueing for the CPU inside the VM

[Daniel P. Berrangé]

On Fri, Nov 29, 2024 at 02:38:52PM +0000, João Vilaça wrote:
> In KubeVirt, through libvirt, we need to know the number of processes
> queued for the CPU inside the VM.
> 
> Can we get this information through the qemu-guest-agent?

The only CPU stats related command in QGA is 'guest-get-cpustat's
returning:

# @user: Time spent in user mode
#
# @nice: Time spent in user mode with low priority (nice)
#
# @system: Time spent in system mode
#
# @idle: Time spent in the idle task
#
# @iowait: Time waiting for I/O to complete (since Linux 2.5.41)
#
# @irq: Time servicing interrupts (since Linux 2.6.0-test4)
#
# @softirq: Time servicing softirqs (since Linux 2.6.0-test4)
#
# @steal: Stolen time by host (since Linux 2.6.11)
#
# @guest: ime spent running a virtual CPU for guest operating systems
#     under the  control of the Linux kernel (since Linux 2.6.24)
#
# @guestnice: Time spent running a niced guest (since Linux 2.6.33)

none of which match your rquest

Essentially what you're asking for seems to be the "load average" which
is a measure of waiting runnable tasks, over some period (1, 5, 15 minutes
typically).

I imagine guest-get-cpustat could be enhanced to include load info without
too much work.

With regards,
Daniel
-- 
|: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org         -o-            https://fstop138.berrange.com :|
|: https://entangle-photo.org    -o-    https://www.instagram.com/dberrange :|

Re: How to query the number of processes queueing for the CPU inside the VM

[João Vilaça]

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That's exactly it. How can we proceed to get it into guest-get-cpustat?

On Fri, Nov 29, 2024 at 3:17 PM Daniel P. Berrangé <berrange@redhat.com>
wrote:

> On Fri, Nov 29, 2024 at 02:38:52PM +0000, João Vilaça wrote:
> > In KubeVirt, through libvirt, we need to know the number of processes
> > queued for the CPU inside the VM.
> >
> > Can we get this information through the qemu-guest-agent?
>
> The only CPU stats related command in QGA is 'guest-get-cpustat's
> returning:
>
> # @user: Time spent in user mode
> #
> # @nice: Time spent in user mode with low priority (nice)
> #
> # @system: Time spent in system mode
> #
> # @idle: Time spent in the idle task
> #
> # @iowait: Time waiting for I/O to complete (since Linux 2.5.41)
> #
> # @irq: Time servicing interrupts (since Linux 2.6.0-test4)
> #
> # @softirq: Time servicing softirqs (since Linux 2.6.0-test4)
> #
> # @steal: Stolen time by host (since Linux 2.6.11)
> #
> # @guest: ime spent running a virtual CPU for guest operating systems
> #     under the  control of the Linux kernel (since Linux 2.6.24)
> #
> # @guestnice: Time spent running a niced guest (since Linux 2.6.33)
>
> none of which match your rquest
>
> Essentially what you're asking for seems to be the "load average" which
> is a measure of waiting runnable tasks, over some period (1, 5, 15 minutes
> typically).
>
> I imagine guest-get-cpustat could be enhanced to include load info without
> too much work.
>
> With regards,
> Daniel
> --
> |: https://berrange.com      -o-
> https://www.flickr.com/photos/dberrange :|
> |: https://libvirt.org         -o-
> https://fstop138.berrange.com :|
> |: https://entangle-photo.org    -o-
> https://www.instagram.com/dberrange :|
>
>

-- 
kind regards,
João Vilaça

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