On 06/13/2011 07:34 AM, 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. Any particular magic needed to try this patchset? Host and guest both 64-bit, Fedora 14. Kernel for both is your 'kvm.git next' with this patchset applied. Host: 2 x Intel(R) Xeon(R) CPU E5540 @ 2.53GHz qemu-kvm git as of May 9. Guest: tried '-cpu host' and without a -cpu arg (so qemu-kvm default). In both cases I get: [ 0.044999] CPU0: Intel(R) Xeon(R) CPU E5540 @ 2.53GHz stepping 05 [ 0.046996] Performance Events: unsupported p6 CPU model 26 no PMU driver, software events only. David > > 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 > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
