Oprofile setup: Difference between revisions

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== Setting Up OProfile to Run on OLPC Laptop ==
== Setting Up OProfile to Run on OLPC Laptop ==


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ramfs filesystem or USB flash drive formatted as ext3 or VFAT
ramfs filesystem or USB flash drive formatted as ext3 or VFAT
to store the OProfile data.
to store the OProfile data.

== Host machine Steps ==

* 0) Kernel 2.6.21-20070328.1.olpc.0ae2b813bbd8293 and newer has oprofile enabled, you can skip to step 5b.

* 1) Download the appropriate kernel srpm from:

http://dev.laptop.org/~dilinger/stable/

* 2) Install srpm on src machine:

rpm -Uvh kernel-2.6.21-20070312.1.olpc.3eca75102a57502.src.rpm

2a) Edit <tt>SOURCES/kernel-olpc-custom.config</tt> changing <tt>CONFIG_OPROFILE</tt> to:

CONFIG_OPROFILE=m

* 3) Start the build in the SPECS directory rebuild the kernel with
command similar to:

rpmbuild -ba --define "dist olpc1p" --define "olpc 1" \
--define "head 3eca75102a57502" --target=i586 \
./olpc-2.6.spec >& olpc_kernel.problems &

* 4) Copy over kernel i586 rpm to olpc machine.

* 5) Copy <tt>vmlinux</tt> to the olpc machine. This is only needed if one wants data on where samples are taken in the kernel.
** a) If building kernel RPM on host machine copy, <tt>BUILD/kernel-2.6.21/linux-2.6.21.i586/vmlinux</tt> to the olpc machine.
** b) If installing newer kernel RPM that enables OProfile, install the kernel-debuginfo RPM for the OLP kernel on the host machine. copy <tt>/usr/lib/debug/lib/modules/</tt>''release''<tt>/vmlinux</tt> to the olpc machine.


== OLPC Machine Steps ==
== OLPC Machine Steps ==


⚫
* 1) Install <tt>binutils</tt> and <tt>oprofile</tt>:
After completing the steps to get a oprofile working kernel on the
olpc machine. If kernel 2.6.21-20070328.1.olpc.0ae2b813bbd8293 or newer is being used skip to step 1:


⚫
yum install binutils oprofile
* 0) If kernel 2.6.21-20070328.1.olpc.0ae2b813bbd8293 or newer is being used skip to step 1.
''Or''
Install the new oprofile enabled kernel and reboot machine:
init 3;
⚫
yum -yt install binutils oprofile


* 2) If running from an image in the internal jffs2 file system, you will need to mount another file system to store the samples. Below are examples of the commands to set that up. You will need to modify for local conditions.
rpm -Uvh kernel-2.6.21-20070318.olpc1p.3eca75102a57502.i586.rpm

⚫
* 1) Install <tt>binutils</tt> on olpc machine:

⚫
yum install binutils

* 2) Install oprofile on olpc machine:

⚫
yum install oprofile

* 3) If running from an image in the internal jffs2 file system,
you will need to mount another file system to store the samples.
Below are examples of the commands to set that up. You will need
to modify for local conditions.


<pre>
<pre>
mkdir /var/lib/oprofile
mount -t ramfs none /var/lib/oprofile
mount -t ramfs none /var/lib/oprofile
</pre>
</pre>
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</pre>
</pre>


* 4) As <tt>root</tt> configure OProfile to collect data:
* 3) As <tt>[[root]]</tt> configure OProfile to collect data:


opcontrol --setup --vmlinux=/root/vmlinux --separate=library
opcontrol --setup --vmlinux=/root/vmlinux --separate=library
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opcontrol --setup --no-vmlinux --separate=library
opcontrol --setup --no-vmlinux --separate=library


* 5) As <tt>root</tt> start oprofile running with:
* 4) As <tt>[[root]]</tt> start oprofile running with:


opcontrol --start
opcontrol --start


* 6) Do desired experiment to collect data
* 5) Do desired experiment to collect data


* 7) As root shutdown '''OProfile''' with:
* 6) As <tt>[[root]]</tt> shutdown '''OProfile''' with:


opcontrol --shutdown
opcontrol --shutdown


* 8) Look at the data with the "<tt>opreport</tt>" command.
* 7) Look at the data with the "<tt>opreport</tt>" command.

⚫
* 8) Unmount filesystem storing '''OProfile''' samples if needed.

== Discussions about Oprofile @ devel ==
* http://lists.laptop.org/pipermail/devel/2007-November/007527.html
* http://lists.laptop.org/pipermail/devel/2008-January/009441.html


⚫
* 9) Unmount filesystem storing '''OProfile''' samples if needed.


[[Category:Developers]]
[[Category:Developers]]

Latest revision as of 14:06, 11 March 2008

  english | spanish HowTo [ID# 115934]  +/-  


Setting Up OProfile to Run on OLPC Laptop

It is possible to get OProfile in timer mode working on the olpc machine. Performance monitoring hardware on Geode process is not supported. The jffs2 file system does NOT support the mechanism that OProfile uses. You will need another file system such as ramfs filesystem or USB flash drive formatted as ext3 or VFAT to store the OProfile data.

OLPC Machine Steps

  • 1) Install binutils and oprofile:
yum install binutils oprofile

Or 

init 3; 
yum -yt install binutils oprofile
  • 2) If running from an image in the internal jffs2 file system, you will need to mount another file system to store the samples. Below are examples of the commands to set that up. You will need to modify for local conditions.
mkdir /var/lib/oprofile
mount -t ramfs none /var/lib/oprofile

Or 

mkdir /media/usbflash
mount -t ext3 /dev/sda1 /media/usbflash
rm -rf /var/lib/oprofile/samples/current
mkdir /media/usbflash/samples
ln -s /media/usbflash/samples /var/lib/oprofile/samples/current
  • 3) As root configure OProfile to collect data:
opcontrol --setup --vmlinux=/root/vmlinux --separate=library

If you do not care about kernel data, you can skip installing vmlinux and configure with: 

opcontrol --setup --no-vmlinux --separate=library
  • 4) As root start oprofile running with:
opcontrol --start
  • 5) Do desired experiment to collect data
  • 6) As root shutdown OProfile with:
opcontrol --shutdown
  • 7) Look at the data with the "opreport" command.
  • 8) Unmount filesystem storing OProfile samples if needed.

Discussions about Oprofile @ devel

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