About Xenoprof support in pvops

About Xenoprof support in pvops

[Xiang Song]

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Hi, list:

I am trying to do some profile work on Xen 4.0 with pvops kernel on an AMD
machine (equipped with *AMD* '*Istanbul*' Family 10h processors). I have
found the dulloor's xenoprof patch for pvops kernel. But it does not contain
supports for IBS. The only IBS support for xenoprofile posted by Wei Wang
seems to be for 2.6.18-dom0 kernel. So is there any support for pvops kernel
to use IBS on AMD?

Another question is when i am using normal profiling event (such as L2_MISS)
on my AMD machine, it seems that it does not generate interrupt when the
performance counter overflows. Is there any problem with AMD processor or
the xenoprofile patch?

Thanks,
    Best regards

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Re: About Xenoprof support in pvops

[Konrad Rzeszutek Wilk]

On Fri, Sep 10, 2010 at 12:13:29AM +0800, Xiang Song wrote:
> Hi, list:
> 
> I am trying to do some profile work on Xen 4.0 with pvops kernel on an AMD
> machine (equipped with *AMD* '*Istanbul*' Family 10h processors). I have
> found the dulloor's xenoprof patch for pvops kernel. But it does not contain
> supports for IBS. The only IBS support for xenoprofile posted by Wei Wang
> seems to be for 2.6.18-dom0 kernel. So is there any support for pvops kernel
> to use IBS on AMD?

Not likely. But we would welcome any patches to get it working again.

> 
> Another question is when i am using normal profiling event (such as L2_MISS)
> on my AMD machine, it seems that it does not generate interrupt when the
> performance counter overflows. Is there any problem with AMD processor or
> the xenoprofile patch?

Does it work under a baremetal kernel?

Re: About Xenoprof support in pvops

[Wei Wang2]

On Thursday 09 September 2010 18:13:29 Xiang Song wrote:
> Hi, list:
>
> I am trying to do some profile work on Xen 4.0 with pvops kernel on an AMD
> machine (equipped with AMD 'Istanbul' Family 10h processors). I have found
> the dulloor's xenoprof patch for pvops kernel. But it does not contain
> supports for IBS. The only IBS support for xenoprofile posted by Wei Wang
> seems to be for 2.6.18-dom0 kernel. So is there any support for pvops
> kernel to use IBS on AMD?
Currently, we have no plan to support IBS on pv_ops.

> Another question is when i am using normal profiling event (such as
> L2_MISS) on my AMD machine, it seems that it does not generate interrupt
> when the performance counter overflows. Is there any problem with AMD
> processor or the xenoprofile patch?
Which xenoprofile patch are you testing? For pv_ops or for 2.6.18-dom0?

Thanks,
Wei


> Thanks,
>     Best regards