Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

These instructions are deliberately very basic. If you want something clever,

go read the real docs ;-) Please don't add more stuff, but feel free to

correct my mistakes ;-)    (mbligh@aracnet.com)

Thanks to John Levon, Dave Hansen, et al. for help writing this.

 is the thing you're trying to measure.

Make sure you have the correct System.map / vmlinux referenced!

It is probably easiest to use "make install" for linux and hack

/sbin/installkernel to copy vmlinux to /boot, in addition to vmlinuz,

config, System.map, which are usually installed by default.

Readprofile

-----------

A recent readprofile command is needed for 2.6, such as found in util-linux

2.12a, which can be downloaded from:

http://www.kernel.org/pub/linux/utils/util-linux/

Most distributions will ship it already.

Add "profile=2" to the kernel command line.

clear           readprofile -r

dump output     readprofile -m /boot/System.map > captured_profile

Oprofile

--------

Get the source (see Changes for required version) from

http://oprofile.sourceforge.net/ and add "idle=poll" to the kernel command

line.

Configure with CONFIG_PROFILING=y and CONFIG_OPROFILE=y & reboot on new kernel

./configure --with-kernel-support

make install

For superior results, be sure to enable the local APIC. If opreport sees

a 0Hz CPU, APIC was not on. Be aware that idle=poll may mean a performance

penalty.

One time setup:

                opcontrol --setup --vmlinux=/boot/vmlinux

clear           opcontrol --reset

start           opcontrol --start

stop            opcontrol --stop

dump output     opreport >  output_file

To only report on the kernel, run opreport -l /boot/vmlinux > output_file

A reset is needed to clear old statistics, which survive a reboot.