Re: [Xen-users] Does xen support Intel Processor Trace?

[Zihan Yang <tgnyang@xxxxxxxxx>]

> > I'd like to use Intel PT to analyze xen crashes, but I don't find the
>
> I'm not sure Intel PT is useful to analyze Xen crashes. If Xen crashes
> the whole system goes down, so how are you going to fetch the trace
> data then?

It seems that Xen has already ported the kdump mechanism(in
http://www-archive.xenproject.org/files/summit_3/kexec_kdump.pdf).
So I guess it might be possible to coredump xen when it crashes, altough I have 
not tried it myself. According to your experience, is it a practical solution?

> It could be interesting for performance analysis IMHO.

I agree, but pure instruction flow seems not sufficient to detect accurate 
reason of performance downgrade(e.g. The growth of response delay). I think some 
extra manual checks are needed.

Thanks

Zihan

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