On 04/12/2011 07:45 PM, Scott Wood wrote:
On Tue, 12 Apr 2011 16:05:29 +0000
Bhushan Bharat-R65777<[email protected]> wrote:
>
>
> > -----Original Message-----
> > From: Avi Kivity [mailto:[email protected]]
> > Sent: Tuesday, April 12, 2011 8:09 PM
> > To: Bhushan Bharat-R65777
> > Cc: [email protected]; [email protected]
> > Subject: Re: [Proposal] QEMU-KVM Interface for granting Performance
> > Monitor to guests
> >
> > On 04/12/2011 10:29 AM, Bhushan Bharat-R65777 wrote:
> > > Hi All,
> > >
> > > The proposal is to about defining the qemu-kvm interface for reserving
> > the performance monitor for guest(guests) in Embedded Power Architecture.
> > The plan is to reserve the Performance Monitor for guest/s on guest boot-
> > up and will be released only on guest reset/exit. If a Performance
> > Monitor reserved by host then it can't be reserved for guest and vice-
> > versa. So when Performance monitor is reserved by host then performance
> > monitor can't be used by guests and if reserved by guest then it should
> > not be used by host.
> >
> > In general we greatly prefer sharing vs. reservation (there are
> > exceptions, for example PCI device assignment).
> >
> > Is there a compelling reason to assign the performance monitor to a
> > single guest?
>
> No, Guest can share with other guests but not with host.
Note that the reservation system is already in use in the host kernel,
between perf event and oprofile (and I think between users of oprofile).
Maybe something could be done with KVM acting as a perf event client.
That is the plan for x86 - using perf events to provide a virtual PMU to
the guest.
--
error compiling committee.c: too many arguments to function
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
