[Xen-tools] How does one get xentrace to trace on disk io?

[Henry Pepper <henrypepr@xxxxxxxxx>]

Hi

I am unable to get xentrace to provide data on IO, it seems that only
SCH class data are provided.

I'm running Xen 3.1.x on Centos 5.5
  Linux c6 2.6.18-194.el5xen #1 SMP Fri Apr 2 15:34:40 EDT 2010 x86_64
x86_64 x86_64 GNU/Linux

I've tried
xentrace -e all  xentrace3.trc
xentrace -e 0x8f000  xentrace4.trc

For both traces I only get the following event's
 domain_wake
 switch_infprev
 switch_infnext
 __enter_scheduler
 lost_records
 do_block

(xentrace_format formats_xen.txt < xentrace4.trc)

Does anyone have any idea of what I'm missing here?

  Thank you

    Henry

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