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Xenoprofile can only be run from dom0.
Profiling from domU would require virtualizing the performance
counters which are not available in Xen today.
You can profile a domU from dom0 using two models: active or
passive mode.
I strongly recommend that you use passive mode if you can, since
it is much easier to configure and use
The main limitation of passive domain profiling is that you cannot separate application samples, although it still provide you detailed samples for
kernel and hypervisor samples. The
user level samples are all groupped into a single bin. If you really want a detailed profile of
your user level code then you need to use active mode. The
tutorial explains how to do that.
In any
case you have to start Oprofile from dom0 and specify which domains you want to
profile.
The
steps a and b that you mention are just needed if you are usin active mode. In
this mode you need to have the uncompressed kernel and xen images available in
the domU (e.g. vmlinux-syms-2.6.8.18-xenU,
xen-syms-3.4-unstable).
Regards
Renato
Dear All,
I am trying to run Xenoprofile in DomU
domain. I have been able to get the xenoprofile working for Dom0 but havent
got luck yet to make it work for domU(s). I am working on AMD Opetron 64 bit
processor with Xen3.4 on rhel5.2 kernel. I am facing following
difficulties:
1. I am using the images from jailtime.org,
have tried ubuntu-8 and centos5.2 images. Ubuntu works fine but centos starts
as a readonly filesystem. I tried to mount it as r/w but it didnt worked. I
have also tried to create a clone domU by copying files and folders from dom0
kernel (rhel5.2), but it gives me kernel panic when booting up, for this
exercise I followed the step from webpage http://www.virtuatopia.com/index.php/Building_a_Xen_Virtual_Guest_Filesystem_on_a_Disk_Image_%28Cloning_Host_System%29.
2. I am not able to comprehend fully, these two steps given in
Xenoprofile tutorial (http://www.xen.org/files/summit_3/xenoprof_tutorial.pdf):
a. Copy Xen and kernel images (in /boot) to domU
file system. b. Copy domU
modules (in /lib/modules) to domU file
system
Please help me if
someone has any suggestion regarding above mentioned points.
Thanks!
Ata
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