Xen users - Jun 2010 - xenoprof problems in 2.6.31.13 pv_ops (xen4.0)

Hi,

I want to use xenoprof to profile the overhead of the hypervisor.
I patched the oprofile-0.9.5 using the patch from xenoprof.sourceforge.net

Xen-4.0.0 + 2.6.31.13 (pv_ops
Jeremy<http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=search;s=Jeremy+Fitzhardinge;st=author>''s
branch) Dom0 + 2.6.31.13 (DOMU)
My platform is NHM-EP (Intel(R) Xeon(R) CPU           X5570  @ 2.93GHz)

My problems are:

   - In DOM0, I can get event list using opcontrol -l, while, after
   initialization (opcontrol --init),  When I start daemon this in DOM0, I got
   the following error messages :

opcontrol --start-daemon --event=CPU_CLK_UNHALTED:1000000
--xen=/boot/xen-syms-4.0.0 --vmlinux=/boot/vmlinux-2.6.31.13
--passive-domains=1 --passive-images=/boot/vmlinux-2.6.31.13-xenu

 /usr/local/bin/opcontrol: line 1399: /dev/oprofile/passive_domains:
Permission denied [Comments: I can''t create a file in
/dev/oprofile/passive_domains manually]

 Error: counter 0 not available nmi_watchdog using this resource ?
Try:[Comments: there is not /dev/oprofile/0 in /dev/oprofile]

opcontrol --deinit

echo 0 > /proc/sys/kernel/nmi_watchdog  [Comments: I do it using this
instructions, but it does not work; and I find that the
/proc/sys/kernel/nmi_whatchdog is 0 already]


   - In DOMU, opcontrol -l , it returens:
   using timer interrupt

My questions are:

    1. Could xenoprof works in PV mode or is there any patches to enable it

    2. Why my domu could not report the correct event list.


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