Messages in this thread | | | From | Christian Borntraeger <> | Subject | Re: [kvm-devel] Réf. : Re: [PATCH 0/4] Virtual Machine Time Accounting | Date | Tue, 21 Aug 2007 10:06:42 +0200 |
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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.
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