linux-kernel - Re: [PATCH 0/4] Virtual Machine Time Accounting

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Date:	Tue, 21 Aug 2007 09:30:56 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Laurent Vivier <Laurent.Vivier@...l.net>,
	kvm-devel <kvm-devel@...ts.sourceforge.net>,
	Ingo Molnar <mingo@...e.hu>, John Stoffel <john@...ffel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	virtualization <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH 0/4] Virtual Machine Time Accounting

On Mon, 2007-08-20 at 09:13 -0700, Jeremy Fitzhardinge wrote:
> Laurent Vivier wrote:
> > functionnalities:
> >
> > - allow to measure time spent by a CPU in a virtual CPU.
> > - allow to display in /proc/state this value by CPU
> > - allow to display in /proc/<pid>/state this value by process
> > - allow KVM to use these 3 previous functionnalities
> >   
> 
> So, currently time spent in a kvm guest is accumulated as qemu-kvm
> usertime, right?  Given that qemu knows when its running in qemu vs
> guest context, couldn't it provide the breakdown between user and guest
> time (ditto lguest)?

No, unfortunately it's accumulated as system time.

Rusty.


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