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Date: Fri, 18 Oct 2013 14:32:20 +0100
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Subject: Re: [Qemu-devel] Watching Resource consumption of guest from Qemu ?
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To: Sunil Agham <sunil.agham@gmail.com>
Cc: qemu-devel <qemu-devel@nongnu.org>


sunil.agham@gmail.com writes:

> Hello List,
>
> I am a graduate student trying to learn about virtualization. I wanted
> to understand if there is any way to tell about resource consumption
> of guest through Qemu ? e.g. if guest starts doing something cpu
> intensive, would qemu be aware of that ? or is there a way to detect
> that from qemu ?

I assume your talking about a KVM quest rather than a system emulated
guest within QEMU? KVM guests will appear as normal user-space tasks to
the host OS so your normal top/htop/iotop tools will show activity
associated with that guest.

I don't think qemu directly monitors CPU utilisation but I could be
wrong. Other information is available though - see
docs/virtio-ballon-stats.txt for example.

Things that trap to QEMU (i.e. hardware access, virtio) however can
certainly be tracked. The the guest is in a pure CPU loop then qemu
won't know about it until the next event it has to deal with.

-- 
Alex Bennée