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Re: [Qemu-devel] pert stat in KVM guest can not get LLC-loads hardware c
From: |
Liang, Kan |
Subject: |
Re: [Qemu-devel] pert stat in KVM guest can not get LLC-loads hardware cache event |
Date: |
Wed, 27 Aug 2014 13:05:59 +0000 |
>
> Dear KVM developers:
> I am trying use perf stat inside a VM to obtain some hardware cache
> performance counter values.
> The perf stat can report some numbers for L1 and TLB related counters. But
> for the LLC-loads and LLC-load-misses, the numbers are always 0. It seems
> that the these offcore events are not exposed to the guest.
>
> Is this a bug in Qemu or KVM?
>
There is no offcore virtualization support in KVM yet.
For you case, I guess you are using paravirt for guest, so it should be 0.
Otherwise, you should get #GP in guest.
> My testbed is
>
> Host kernel: 3.12.26
> Qemu: 2.1.0
> CPU: Intel Ivy bridge 2620
> VM boosted by qemu, with -cpu host.
>
> Thanks.
>
> - Hui Kang
- [Qemu-devel] pert stat in KVM guest can not get LLC-loads hardware cache event, Steven, 2014/08/27
- Message not available
- Re: [Qemu-devel] pert stat in KVM guest can not get LLC-loads hardware cache event,
Liang, Kan <=
- Re: [Qemu-devel] pert stat in KVM guest can not get LLC-loads hardware cache event, Steven, 2014/08/27
- Re: [Qemu-devel] pert stat in KVM guest can not get LLC-loads hardware cache event, Steven, 2014/08/27
- Message not available
- Re: [Qemu-devel] pert stat in KVM guest can not get LLC-loads hardware cache event, Liang, Kan, 2014/08/27
- Re: [Qemu-devel] pert stat in KVM guest can not get LLC-loads hardware cache event, Steven, 2014/08/27
- Message not available
- Re: [Qemu-devel] pert stat in KVM guest can not get LLC-loads hardware cache event, Liang, Kan, 2014/08/27