Re: [RFC][PATCH v2 4/7] taskstats: Add per task steal time accounting

[Avi Kivity]

On 11/16/2010 05:45 PM, Peter Zijlstra wrote:
> > > In fact, kvm seems to already have these tracepoints: kvm_exit/kvm_entry
> > > and it has a separate excplicit hypercall tracepoint as well:
> > > kvm_hypercall.
> > But the kvm tracepoints are used when Linux is the hypervisor, no? For our
> > situation that would be a tracepoint in z/VM - or the equivalent. This is
> > out of scope of this patch.
> Ah crud, you might be right.. Avi could a kvm guest generate events on
> vcpu enter/exit?

No.  Hypercalls are voluntary and known, but most exits are involuntary 
and unknown to the guest.  Any memory access can generate a page fault, 
and any host interrupt will exit the guest.
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