Re: Wiki docs on counting and tracing KVM perf events

[Avi Kivity <avi@redhat.com>]

On 05/13/2010 05:35 PM, Stefan Hajnoczi wrote:
> How to count and trace KVM perf events:
>
> http://www.linux-kvm.org/page/Perf_events
>
> I want to draw attention to this because traditional kvm_stat and
> kvm_trace use has been moving over to the debugfs based tracing
> mechanisms.  Perhaps we can flesh out documentation and examples of
> common perf event usage.
>
>    

Two things are missing to make this really useful:

- a continuously updating difference mode like kvm_stat
- subevents; for example kvm:kvm_exit is an aggregate of all exit types 
that can be split using filters to show individual exit reason statistics

The plan is to eventually remove kvm_stat based performance monitoring 
in favour of perf events.

-- 
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