Fedora xen - May 2007 - how to get non-compressed vmlinux for Oprofile

Hi,*

A question about how to get the non-compressed vmlinux, not vmlinuz, reasons as
follows:

when I want to run Oprofile, I should run this command
# opcontrol --start --vmlinux=/boot/vmlinux-''uname -r''
But firstly I should get the vmlinux, otherwise the following error will pop up:

The specified file /boot/vmlinux-uname does not seem to be valid
Make sure you are using the non-compressed image file (e.g. vmlinux not vmlinuz)

I am running the Oprofile on fedora with kernel-xen 2.6.19-1.2911.6.5.fc6xen, as
the latest kernel-xen version 2.6.20-1.2948 is very unstable. So I
don''t want to update my current kernel-xen.

How can I get the vmlinux??
In fact if I run this:
yum --enablerepo=core-debuginfo --enable=updates-debuginfo install\
kernel-debuginfo

and then

# rpm -q --list kernel-xen-debuginfo | grep vmlinux
/usr/lib/debug/lib/modules/2.6.20-1.2948.fc6xen/vmlinux

I will get the 2.6.20-1.2948.fc6xen vmlinux, the latest one, which
doesn''t match my kernel-xen 2.6.19-1.2911.6.5.fc6xen.

How can I get the vmlinux which matches my kernel-xen?

some relevant links about how to set up Oprofile:
http://www.serpentine.com/blog/2006/12/17/make-linux-performance-analysis-easier-with-oprofile/
http://people.redhat.com/wcohen/FedoraCore6OProfileTutorial.txt

Any hints will be greatly appreciated!!!
Thanks!!!

On Wed, May 30, 2007 at 05:01:30PM +0200, Songtao Liu
wrote:
> Hi,*
> 
> A question about how to get the non-compressed vmlinux, not vmlinuz,
reasons as follows:
> 
> when I want to run Oprofile, I should run this command
> # opcontrol --start --vmlinux=/boot/vmlinux-''uname -r''
Use backticks (`) instead of normal quotes (''). `uname -r` is just a
way to make sure you get the right kernel version. But the
vmlinux-<your-kernel-version> file should exist, anyway.
> But firstly I should get the vmlinux, otherwise the following error will
pop up:
> 
> The specified file /boot/vmlinux-uname does not seem to be valid
> Make sure you are using the non-compressed image file (e.g. vmlinux not
vmlinuz)
> 
> I am running the Oprofile on fedora with kernel-xen
2.6.19-1.2911.6.5.fc6xen, as the latest kernel-xen version 2.6.20-1.2948 is very
unstable. So I don''t want to update my current kernel-xen.
> 
> How can I get the vmlinux??
> In fact if I run this:
> yum --enablerepo=core-debuginfo --enable=updates-debuginfo install\
kernel-debuginfo
> 
> and then
> 
> # rpm -q --list kernel-xen-debuginfo | grep vmlinux
> /usr/lib/debug/lib/modules/2.6.20-1.2948.fc6xen/vmlinux
> 
> I will get the 2.6.20-1.2948.fc6xen vmlinux, the latest one, which
doesn''t match my kernel-xen 2.6.19-1.2911.6.5.fc6xen.
You would need to install kernel-xen-debuginfo-2.6.19-1.2911.fc6,
that is not on the FC6 updates repository anymore, maybe you can find
it somewhere.

But you are lucky: differently from the non-xen kernel image (that
is a bzImage file), the xen vmlinuz can be easily decompressed using
''gzip'' and you''ll get a vmlinux file, without having
to download the
kernel-xen-debuginfo package for your kernel.

# gzip -d < /boot/vmlinuz-`uname -r` > /tmp/vmlinux-`uname -r`

Then you''ll have your vmlinux file under /tmp.

-- 
Eduardo