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SubjectRe: [kvm-devel] Réf. : Re: [PATCH 0/4] Virtual Machine Time Accounting
Date
Am Montag, 20. August 2007 schrieb Glauber de Oliveira Costa:
> Although I don't know KVM to a that deep level, I think it should be
> possible to keep the virtual cpus in different process (or threads),
> and take the accounting time from there. Perfectly possible to know
> the time we spent running (user time), and the time the hypervisor
> spent doing things on our behalf (system time).

I disagree here. First thing, you dont want to have the virtual cpu in a
different process than the hypervisor control code for that cpu. Otherwise
communication has to be made via IPC.
Secondly, Its not qemu/kvm that does the accouting. Its existing userspace
code like top/snmp agents and clients! etc. that would require additional
knowledge which thread is guest code.

I personally like the approach Laurent has taken. Maybe it needs some polish
and maybe we want an account_guest_time function, but in general I think he
is doing the right thing.

Christian
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