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

  • From: Zihan Yang <tgnyang@xxxxxxxxx>
  • Date: Wed, 20 Sep 2017 00:08:11 -0400
  • Cc: xen-users@xxxxxxxxxxxxx
  • Delivery-date: Wed, 20 Sep 2017 04:09:29 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

> > 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
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.

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