Re: [PATCH v2 00/11] KVM in-guest performance monitoring

[Avi Kivity <avi@redhat.com>]

On 06/13/2011 04:34 PM, Avi Kivity wrote:
> This patchset exposes an emulated version 1 architectural performance
> monitoring unit to KVM guests.  The PMU is emulated using perf_events,
> so the host kernel can multiplex host-wide, host-user, and the
> guest on available resources.
>
> Caveats:
> - counters that have PMI (interrupt) enabled stop counting after the
>    interrupt is signalled.  This is because we need one-shot samples
>    that keep counting, which perf doesn't support yet
> - some combinations of INV and CMASK are not supported
> - counters keep on counting in the host as well as the guest
>
> perf maintainers: please consider the first three patches for merging (the
> first two make sense even without the rest).  If you're familiar with the Intel
> PMU, please review patch 5 as well - it effectively undoes all your work
> of abstracting the PMU into perf_events by unabstracting perf_events into what
> is hoped is a very similar PMU.
>
> v2:
>   -  don't pass perf_event handler context to the callback; extract it via the
>      'event' parameter instead
>   -  RDPMC emulation and interception
>   -  CR4.PCE emulation

Peter, can you look at 1-3 please?

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