On 08/30/2016 11:22 AM, Sanghyun Hong wrote:
>> As I said, this works for me for Xen guests. I thought perf kvm might
>> check whether there is a KVM guest but it's not. The error message that
>> you see is generated at the end of sampling if no samples are found.
>
> Oh, I see. I tried the same co
As I said, this works for me for Xen guests. I thought perf kvm might
check whether there is a KVM guest but it's not. The error message that
you see is generated at the end of sampling if no samples are found.
Oh, I see. I tried the same command and check the contents of the perf.data.kvm
file,
On 08/29/2016 08:12 PM, Sanghyun Hong wrote:
> Hi Boris,
>
> /[Appreciate for your support, and I have one last question]/
>
> Since we’re using the */Xen/* hypervisor (not the KVM that is
> type-II), I think we cannot use the /*perf k*/*/vm/* command. Here are
> the outputs:
>
>
> # pe
Yes, this will allow the hypervisor to collect samples from multiple
guests. However, the tool (perf) probably won't be able to properly
process these samples. But you can try.
I understand, thus, I applied the patches and set the pmu_mode to all. However,
I’m really curious what you mean by the
Hi Boris,
[Appreciate for your support, and I have one last question]
Since we’re using the Xen hypervisor (not the KVM that is type-II), I think we
cannot use the perf kvm command. Here are the outputs:
# perf kvm --host --guest record -C 1 sleep 1
[ perf record: Woken up 1 times to w
I really appreciate for your answers. Last but not the least, I want to make it
more clear:
> The hypervisor will provide dom0 with a raw sample (guest's, dom0's or
> hypervisor's) and then it's the job of dom0 kernel to properly tag and
> format it and make it available to the userland (i.e. per
Hi Boris,
I’ve found the
documentations(https://github.com/torvalds/linux/blob/master/Documentation/ABI/testing/sysfs-hypervisor-pmu)
in the kernel source code, and it seems like if we change the mode from self
to all then we can collect counters for all the domains, right?
All the best,
Sangh
On 08/29/2016 05:48 PM, Sanghyun Hong wrote:
> I really appreciate for your answers. Last but not the least, I want to make
> it more clear:
>
>> The hypervisor will provide dom0 with a raw sample (guest's, dom0's or
>> hypervisor's) and then it's the job of dom0 kernel to properly tag and
>> form
On 08/29/2016 05:08 PM, Sanghyun Hong wrote:
>> Yes, this will allow the hypervisor to collect samples from multiple
>> guests. However, the tool (perf) probably won't be able to properly
>> process these samples. But you can try.
>
> I understand, thus, I applied the patches and set
> the /pmu_mod
On 08/29/2016 02:42 PM, Sanghyun Hong wrote:
> Hi Boris,
>
> I’ve found the
> documentations(https://github.com/torvalds/linux/blob/master/Documentation/ABI/testing/sysfs-hypervisor-pmu)
> in the kernel source code, and it seems like if we change the mode
> from *self* to *all* then we can collect
On 08/29/2016 09:18 AM, Sanghyun Hong wrote:
> Dear Xen-Devel Community:
>
> I’m a grad student working on measuring performance counters at the
> Xen domains. I read this
> thread(https://wiki.xenproject.org/wiki/Xen_Profiling:_oprofile_and_perf) in
> web, and it says using Linux perf command will
Dear Xen-Devel Community:
I’m a grad student working on measuring performance counters at the Xen
domains. I read this
thread(https://wiki.xenproject.org/wiki/Xen_Profiling:_oprofile_and_perf) in
web, and it says using Linux perf command will let us collecting performance
counters in both dom0
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