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QUICKSTART

How to use LTTng and LTTV in a few lines :

These operations are made for installing LTTng 0.2 on a linux 2.6.12-rc2-mm2
kernel. Change the versions to fit your needs.

Author : Mathieu Desnoyers, September 2005


* Getting the LTTng packages

su -
mkdir /usr/src/lttng
cd /usr/src/lttng
(see http://ltt.polymtl.ca/lttng for package listing)
wget http://ltt.polymtl.ca/lttng/lttng-modules-0.2.tar.bz2
wget http://ltt.polymtl.ca/lttng/patch-2.6.12-rc4-mm2-lttng-0.2.bz2
bzip2 -cd lttng-modules-0.2.tar.bz2 | tar xvof -


* Getting LTTng kernel sources

su -
cd /usr/src
wget http://kernel.org/pub/linux/kernel/v2.6/testing/linux-2.6.12-rc4.tar.bz2
wget http://kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.12-rc4/2.6.12-rc4-mm2/2.6.12-rc4-mm2.bz2
bzip2 -cd linux-2.6.12-rc4.tar.bz2 | tar xvof -
cd linux-2.6.12-rc4
bzip2 -cd ../2.6.12-rc4-mm2.bz2 | patch -p1
bzip2 -cd /usr/src/lttng/patch-2.6.12-rc4-mm2-lttng-0.2.bz2 | patch -p1
cd ..
mv linux-2.6.12-rc4 linux-2.6.12-rc4-mm2-lttng-0.2


* Installing a LTTng kernel

su -
cd /usr/src/linux-2.6.12-rc4-mm2-lttng-0.2
make menuconfig
  General setup
    * Linux Trace Toolkit Instrumentation Support
    M or * Linux Trace Toolkit Tracer
    do NOT activate (not ready yet) :
        Align Linux Trace Toolkit Traces
        Activate Linux Trace Toolkit Heartbeat Timer
make install
reboot


* Install the ltt-modules

su -
cd /usr/src/lttng/lttng-modules-0.2
KERNELDIR=/usr/src/linux-2.6.12-rc4-mm2-lttng-0.2 make
KERNELDIR=/usr/src/linux-2.6.12-rc4-mm2-lttng-0.2 make modules_install

note : at this stage, you might want to execute
modprobe ltt-control

and you might also want to do this :
echo ltt-control >> /etc/modules


* Getting and installing the LTTV package

su -
cd /usr/src
wget http://ltt.polymtl.ca/packages/LinuxTraceToolkitViewer-0.5-16092005.tar.gz
gzip -cd LinuxTraceToolkitViewer-0.5-16092005.tar.gz | tar xvof -
cd LinuxTraceToolkitViewer-0.5-16092005
./configure
make
make install

* Use LTTV

lttv-gui (or /usr/local/bin/lttv-gui)
  - Spot the "Trace Control" icon : click on it
    - enter the root password
    - click "start"
    - click "stop"
    - Yes
      * You should now see a trace


* Getting and installing genevent

u -
cd /usr/src
wget http://ltt.polymtl.ca/packages/genevent-0.1.tar.gz
gzip -cd genevent-0.1.tar.gz | tar xvof -
cd genevent-0.1
make
make install


* Add new events to the kernel with genevent

su -
cd /usr/local/share/LinuxTraceToolkitViewer/facilities
cp process.xml yourfacility.xml
  * edit yourfacility.xml to fit your needs.
cd /tmp
/usr/local/bin/genevent /usr/local/share/LinuxTraceToolkitViewer/yourfacility.xml
cp ltt-facility-yourfacility.h ltt-facility-id-yourfacility.h \
         /usr/src/linux-2.6.12-rc4-mm2-lttng-0.2/include/linux/ltt
cp ltt-facility-loader-yourfacility.c ltt-facility-loader-yourfacility.h \
         /usr/src/linux-2.6.12-rc4-mm2-lttng-0.2/ltt
  * edit the kernel file you want to instrument
    - Add #include <linux/ltt/ltt-facility-yourfacility.h> at the beginning
      of the file.
    - Add a call to the tracing functions. See their names and parameters in
      /usr/src/linux-2.6.12-rc4-mm2-lttng-0.2/include/linux/ltt/ltt-facility-yourfacility.h