Re: [Qemu-devel] qemu processes

[Ryan Boyce <ryanpboyce12@gmail.com>]

Thank you my friend!

On Wed, Jun 12, 2019 at 12:48 PM Alex Bennée <alex.bennee@linaro.org> wrote:

> You've actually contacted the development list but I can answer the
> question.
>
> QEMU is multi-threaded so there will be a thread per KVM based vCPU
> (and also for TCG based vCPUs where MTTCG is enabled). There will also
> be a number of additional threads created including at least one for
> the main monitor thread and potentially additional threads for
> servicing IO requests. So expect to see $SMP + 1 + n threads for each
> QEMU instance.
>
> On Wed, 12 Jun 2019 at 16:32, Ryan Boyce <ryanpboyce12@gmail.com> wrote:
> >
> > Hi Stefan,
> >
> > I am a big fan of your blog! In relation to your blog post,
> >
> http://blog.vmsplice.net/2011/03/qemu-internals-big-picture-overview.html,
> > I have a question I am really hoping you can answer:
> >
> > When I start a VM, I see that the qemu-kvm processes start and run as
> > "qemu-kvm..... -name "something1"...."
> > My issue, though, is I see multiple processes running as "qemu-kvm.....
> > -name "something1"...." and each of these processes has memory/cpu/disk
> > mapped to it.
> > Does qemu-kvm run VMs on a one-to-one VM-to-host process basis? Or does
> > each virtual cpu on the guest get its own process on the host?
> > For example, If I have a VM that has 4 virtual cpus, will I see 4
> processes
> > (PIDs) on the host or should I see just see one for the VM itself.
> >
> > Any help you can give would be GREATLY appreciated. Thank you!
> >
> > Ryan
>
>
>
> --
> Alex Bennée
> KVM/QEMU Hacker for Linaro
>