On Thu, 2011-11-10 at 14:57 +0200, Gleb Natapov wrote: > This patchset exposes an emulated version 2 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. > > The patches are against next branch on kvm.git. > > If you want to try running perf in a guest you need to apply the patch > below to qemu-kvm and use -cpu host on qemu command line. But DO NOT > TRY those patches without applying [1][2] to the host kernel first. > Don't tell me I didn't warn you! > > [1] https://lkml.org/lkml/2011/10/18/390 > [2] https://lkml.org/lkml/2011/10/23/163 > > Changelog: > v1->v2 > - put index into struct kvm_pmc instead of calculating it > - use locked version of bitops > - inject pmi from irq work if vcpu was not in a guest mode during NMI > - providing stub for perf_get_x86_pmu_capability() for !PERF_EVENTS > v2->v3 > - minor style change/comment clarification > - add perf patch to disable arch event not supported by a CPU > - create perf events as pinned
On the pinned thing, do check event->state, if it hits PERF_EVENT_STATE_ERROR you're up shit creek and the counter didn't get scheduled. This can happen because eg. cpu-pinned events have higher precedence than task-pinned events. I've taken the two perf patches from this (6 and 7), the rest I gather should go through the KVM tree. I've only cursory looked at the other patches but didn't spot anything very curious. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
