Christian Borntraeger wrote:
Am Montag, 13. August 2007 schrieb Laurent Vivier:
[copying Ingo and Rusty]
@Avi, seems that sourceforge is mangling the cc list?
It's not configured to do so. Can you be more specific?
The patches look good. A couple of comments:
- perhaps the new fields should be guarded by a #ifdef CONFIG_HYPERVISOR
(selected by CONFIG_KVM)? that way the (minor) additional overhead is
only incurred if it can possibly be used. I imagine that our canine
cousin will want to use this as well.
There is also a CONFIG_VIRTUALIZATION and a CONFIG_VIRT_CPU_ACCOUNTING (from
s390 and powerpc) Which one to use ?
CONFIG_VIRT_CPU_ACCOUNTING is used for the precise accouting of user,system,
steal and irq time on these platforms and is not what you want for the on/off
decision.
Ah, ok.
I'm wondering if we can have a more accurate accounting:
- For the moment we add all system time since the previous entering to the
VCPU to the guest time (and I guess there is some real system time in
it ???)
- Perhaps we can sum nanoseconds spent in the VCPU and add it to cpustat
when these ns are greater than 1 ms ? (I'm trying to make something in this
way)
If you look at the patch I have posted some minutes ago, I use a method
similar to irq_enter and irq_exit to separate real system time from guest
time.
Yes. This is orthogonal to the current accounting patch and should make
a nice extension. It's probably useful with dynamic tick where timer
interrupts can be rare.
--
error compiling committee.c: too many arguments to function
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