Re: XENOPROF Problem

[Ahmad Hassan <ahmad.hassan@gmail.com>]

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Hi Andrew,

Thanks for the message.

That looks right to me. You also need Xenoprof support in your dom0 kernel.
> If you're using one of the kernels from the Xen source tree and you can
> `modprobe oprofile` successfully, you should be ok.
>

Yes I loaded the oprofile as "modprobe oprofile". It loads successfully.

>
>
> Dom0: opcontrol --start-daemon --event= CPU_IO_REQUESTS_TO_MEMORY_IO:1000000
> --xen=/boot/xen-syms-3.4.1   --vmlinux=/boot/vmlinux  --passive-domains=1
> --passive-images=/boot/vmlinux
> *At the above command, I get the warning as :
> /dev/oprofile/passive-domains Permission Denied* but daemon starts
> eventually
>
>
If i start the Dom0 daemon for passive domains using the above command  the
the following exact output I get

*At the above command, I get the warning as : /dev/oprofile/passive-domains
Permission Denied*
*Using* *2*.*6*+ *OProfile* *kernel* interface.
*Using* *log* *file* /*var*/*lib*/*oprofile*/*oprofiled*.*log*
*Daemon* *started*.
*Profiler* *running*

Yes I am running it as a root. If I look at the * /dev/oprofile the I don't
find any file name passive-domains.

Opreport -l shows the following error:

* "opreport error: No sample file found: try running opcontrol --dump or
specfiy a session containing sample file"


When I try active-domains option then inside DomU, I get the following error
while starting the daemon:

*"You cannot specify any performance counter events because OProfile is in
timer mode.*"

Why the above error appears for active domains? Do I need to pass "lapic"
parameter in the grub file of dom0?

Thanks for the help

Best Regards, Hassan

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