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[Xen-devel] Xenoprof cannot do profiling with active mode in domU

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Xenoprof cannot do profiling with active mode in domU
From: K L <intervalmg@xxxxxxxxx>
Date: Tue, 7 Sep 2010 10:49:46 -0400
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Sorry for duplicate messages.

I also read Renato's thread
It seems that the problems have something to do with configuration.
But I patched oprofile-0.9.5.tar.gz with patch
oprofile-0.9.5-xen.patch and complied successfully. I have no idea
what the problem is.

When I type 'opcontrol -l', I will see the following:

testvm02:~/oprofile-0.9.5# opcontrol -l
Using timer interrupt.

I can locate the code in 'ophelp.c'
line 405:
        if (cpu_type == CPU_TIMER_INT) {
                if (!check_events)
                        printf("Using timer interrupt.\n");

Any comments are greatly appreciated.

---------- Forwarded message ----------
From: K L <intervalmg@xxxxxxxxx>
Date: Sun, Sep 5, 2010 at 10:45 PM
Subject: xenoprofile cannot run in active mode in domU
To: xen-devel@xxxxxxxxxxxxxxxxxxx

Dear all,

I have enable xen-3.4.2 oprofile configuration and compiled the
oprofile-0.9.5.tar.gz with patch oprofile-0.9.5-xen.patch.

I 'scp' the xen-syms kernel and the vmlinux kernel to domU. I want to
start the mode with:

opcontrol --start --event=CPU_CLK_UNHALTED:1000000:1:1:1 --xen
xen-syms-3.4.2 --vmlinux=vmlinux

But it shows the result like:

testvm02:~# opcontrol --start --event=CPU_CLK_UNHALTED:1000000:1:1:1
--xen xen-syms-3.4.2 --vmlinux=vmlinux You cannot specify any
performance counter events
because OProfile is in timer mode.

I have read previous thread 'Xenoprof: getting Oprofile out of timer
mode?'(http://copilotco.com/mail-archives/xen.2006/msg12482.html). It
seems the problem has been fixed. But why I cannot run xenoprofile in
active mode in domU. Does it have something to do with apic?(I have
configured in /etc/xen/testvm02.cfg with lapic)

My machine is HP proliant. I can provide further information if needed.


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