From: "Daniel P. Berrangé" <berrange@redhat.com>
To: Peter Lieven <pl@kamp.de>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: Limiting per vCPU Usage
Date: Mon, 21 Sep 2020 09:29:50 +0100 [thread overview]
Message-ID: <20200921082950.GF1942072@redhat.com> (raw)
In-Reply-To: <68336702-cedc-dc38-3d18-d153cd7652dd@kamp.de>
On Sun, Sep 20, 2020 at 10:24:41PM +0200, Peter Lieven wrote:
> Hi Qemu folks,
>
>
> is there a BCP to limit just the maximum usage of a virtual (KVM) cpu?
>
> I know that there are many approaches, but as far as I know they all limit the complete qemu process which is far more
>
> than just the virtual CPUs.
>
> Is it possible to limit just the vCPU threads and leave threads that
> handle the monitor, vnc, qmp, iothreads, storage backend etc.
Libvirt uses cgroups to achieve what you describe. A cgroup for the
QEMU process as a whole, then create child cgroups, one for each
vCPUs, and a further one for non-vCPU threads. CPU limits are then
applied on the child cgroups.
Regards,
Daniel
--
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next prev parent reply other threads:[~2020-09-21 8:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-20 20:24 Limiting per vCPU Usage Peter Lieven
2020-09-21 8:29 ` Daniel P. Berrangé [this message]
2020-09-21 13:47 ` Peter Lieven
2020-09-21 14:09 ` Daniel P. Berrangé
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