From: Paolo Bonzini <pbonzini@redhat.com>
To: William Heath <wgheath@gmail.com>
Cc: kvm <kvm@vger.kernel.org>
Subject: Re: Question about suspended virtual machine resources on a kvm hypervisor
Date: Tue, 11 Mar 2014 09:37:17 +0100 [thread overview]
Message-ID: <531ECB3D.5070508@redhat.com> (raw)
In-Reply-To: <CAAcUL6nHWA0uaOXefv=upJ=6Ht2ymJLwZfuNvUDMJvaQJWzqbQ@mail.gmail.com>
Il 11/03/2014 09:10, William Heath ha scritto:
> So is the CPU re-allocated to other virtual machines that need them?
In KVM, virtual CPUs are just threads; if a thread does not want to run,
the Linux scheduler does not give it any CPU. If the virtual machine
monitor you're using is QEMU, the virtual CPU threads of a suspended VM
will be waiting on a condition variable until the VM is resumed.
> I take it then that RAM and disk usage are not reallocated?
No. But RAM can be swapped out, for both suspended and running VMs.
Paolo
prev parent reply other threads:[~2014-03-11 8:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-10 20:33 Question about suspended virtual machine resources on a kvm hypervisor William Heath
2014-03-11 7:49 ` Paolo Bonzini
2014-03-11 8:10 ` William Heath
2014-03-11 8:37 ` Paolo Bonzini [this message]
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